CN113162223B - Power supply for gas density monitoring device, implementation method and transformation method thereof - Google Patents

Abstract

The application provides a power supply for a gas density monitoring device, a realization method and a reconstruction method thereof, which comprises a first loop formed by connecting a power supply unit A, a contact state monitoring control unit and an alarm or locking contact of a gas density relay, and a second loop formed by connecting a power supply unit B, an alarm or locking element and an alarm or locking element connecting unit; the alarm or locking element connecting unit is connected in series with the alarm or locking element; the contact state monitoring control unit controls the alarm or locking element switching-on unit not to switch on the alarm or locking element when the contact is not in action, and the power supply unit A supplies power to the gas density monitoring device through the first loop; the control alarm or locking element switch-on unit switches on the alarm or locking element when the contact is actuated, and the power supply unit B supplies power to the alarm or locking element through the second loop. The application utilizes the existing alarm or locking cable to acquire the power supply of the gas density monitoring device, does not need to rewire to acquire electricity, saves the cost and is also suitable for the construction of a new transformer substation.

Description

Power supply for gas density monitoring device, implementation method and transformation method thereof

Technical Field

The invention relates to the technical field of electric power, in particular to a power supply for a gas density monitoring device applied to high-voltage and medium-voltage electrical equipment, and an implementation method and a transformation method thereof.

Background

Along with the development of an unattended transformer substation to a networking and digitalization direction and the continuous enhancement of the requirements on remote control and remote measurement, the method has important practical significance on-line monitoring of the gas density and micro water content state of SF6 electrical equipment. Along with the continuous development of the intelligent power grid in China, the intelligent high-voltage electric equipment is used as an important component and a key node of an intelligent substation, and plays a role in the safety of the intelligent power grid. High-voltage electrical equipment is currently mostly SF6 gas insulation equipment, and if the gas density is reduced (such as caused by leakage, etc.), the electrical performance of the equipment is seriously affected, and serious hidden danger is caused to safe operation.

Currently, it is very common to use a gas density relay to monitor gas density values in SF6 high voltage electrical equipment on-line. A gas density relay is generally used for monitoring and controlling the density of insulating gas in high-voltage electrical equipment, a gas path of the gas density relay is communicated with a gas chamber of the high-voltage electrical equipment, an alarm or locking contact (or called a gas density relay alarm or locking contact) is arranged in the gas density relay, the alarm or locking contact is connected in an alarm (or locking) loop with an alarm (or locking) element, and a power supply unit is connected in the alarm (or locking) loop to supply power to the alarm (or locking) element (refer to figure 1). When gas leakage is detected, an alarm (or locking) contact of the gas density relay acts, an alarm (or locking) loop of the gas density relay is conducted, and an alarm (or locking) element gives out an alarm or locks, so that safe operation protection of electrical equipment is realized.

Along with the popularization of gas density intelligent monitoring, the current gas density relay side still is provided with gas density monitoring devices, and gas density monitoring devices and gas density relay can design into an integral structure, also can design into the composition structure, and it not only can realize the on-line monitoring of gas density, but also has the check-up function to gas density relay simultaneously, and then accomplishes (mechanical) gas density relay's periodic check-up work, and the maintainer need not to arrive the scene, has improved work efficiency greatly. The intelligent gas density monitoring devices all need working power supply, however, at present, a rewiring mode is adopted to supply power to the gas density monitoring devices on the gas density relay side, namely, cables are pulled from a control cabinet or a sink control cabinet. In a running transformer substation, wiring is a difficult problem, a cable is required to run through a cable trench, a plurality of places are required to dig a trench, steel pipes are arranged, and labor cost is high. If a new cable is not adopted to introduce a power supply, a battery is adopted, firstly, the power of the battery is not high enough, the work such as on-line verification is difficult to complete, secondly, the service life of the battery is short, and the actual requirement is difficult to meet. Therefore, how to efficiently and inexpensively solve the power supply problem of the intelligent gas density monitoring device so as to accelerate the popularization of the intelligent gas density monitoring is a problem to be solved at present.

Disclosure of Invention

The invention aims to provide a power supply for a gas density monitoring device, an implementation method and a transformation method thereof, so as to solve the problems in the technical background.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The first aspect of the present application provides a power supply for a gas density monitoring apparatus, comprising: the contact state monitoring control unit, the alarm or locking element connecting unit, the alarm or locking element, the power supply unit A, the power supply unit B and the gas density relay alarm or locking contact; wherein,

The power supply unit A, the contact state monitoring control unit and the gas density relay alarm or locking contact are connected to form a first loop;

the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit are connected to form a second loop;

the alarm or locking element is connected with a unit in series with the alarm or locking element in the second loop;

The contact state monitoring control unit is arranged on the side of the control cabinet (or the control cabinet) and/or the side of the gas density relay, is respectively connected with the alarm or locking contact of the gas density relay and the alarm or locking element connection unit, and is configured to monitor the contact state of the alarm or locking contact of the gas density relay and control the on-off of the alarm or locking element connection unit according to the contact state;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in a non-action state, the contact state monitoring control unit controls the alarm or locking element connection unit not to connect the alarm or locking element, namely, the second loop is disconnected, so that the power supply unit A supplies power to the gas density monitoring device at the gas density relay side through a cable line of the first loop; when the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, namely the second loop is conducted, so that the power supply unit B supplies power to the alarm or locking element through a cable line of the second loop.

Preferably, the contact state monitoring control unit comprises a contact state monitoring element and a control element, wherein the contact state monitoring element is configured to monitor the contact state of the gas density relay alarm or locking contact, and the control element is configured to control the on-off of the alarm or locking element on-off unit according to the contact state.

More preferably, the contact state monitoring element and the control element are both disposed on a side of a control closet (or control closet); or the contact state monitoring element is arranged on the gas density relay side, the control element is arranged on the side of the control cabinet (or the control cabinet), and the contact state monitoring element is connected with the control element in a wireless communication mode.

In a preferred embodiment, the wireless communication means includes, but is not limited to, one or more of NB-IOT, 2G/3G/4G/5G, WIFI, bluetooth, loRa, loRawan, zigBee, infrared, ultrasonic, acoustic, satellite, optical, quantum communication, and sonar.

More preferably, the contact state monitoring element includes an optocoupler, or an optocoupler and a resistor; or alternatively

The contact state monitoring element comprises a current sensor and/or a voltage sensor and/or a current detector and/or a voltage detector; or alternatively

The contact state monitoring element comprises a self-recovery fuse, or a self-recovery fuse and a silicon controlled rectifier, or a self-recovery fuse and a triode; or alternatively

The contact state monitoring element comprises a current transformer and/or a voltage transformer; or alternatively

The contact state monitoring element comprises a silicon controlled rectifier, a resistor, and/or a MOS field effect transistor, and/or a triode, and/or a diode; or alternatively

The contact state monitoring element comprises an electromagnetic relay and/or an electronic relay; or alternatively

The contact state monitoring element comprises one or more of a resistor, a heating element, a fan, a light emitting diode, a photoelectric device, a loudspeaker, a motor, an electromagnet, an electric relay and a micro fan; or alternatively

The contact state monitoring element comprises one or more of a switch, an electric contact, an optocoupler, a silicon controlled rectifier, DI, a relay, a MOS field effect transistor, a triode, a diode, a MOS FET relay, a solid state relay, a time relay, a power relay, a current sensor, a current transformer, a voltage sensor, a voltage transformer, a current detector, a voltage detector, a resistor and a self-recovery fuse.

More preferably, the control element comprises an optocoupler, or an optocoupler and a resistor; or alternatively

The control element comprises a silicon controlled rectifier, a resistor, and/or a MOS field effect transistor, and/or a triode, and/or a diode; or alternatively

The control element comprises an electromagnetic relay, and/or an electronic relay; or alternatively

The control element comprises a microprocessor and a control relay; or alternatively

The control element comprises one or more of a resistor, a photoelectric device and an electric relay; or alternatively

The control element comprises one or more of a switch, an electric contact, an optocoupler, a silicon controlled rectifier, a DI, a MOS field effect transistor, a triode, a diode, a MOS FET relay, a solid state relay, a time relay, a power relay, a resistor, a microprocessor and an integrated chip.

More preferably, the contact state monitoring element includes any one of a voltage sampling circuit, a current sampling circuit, a power conversion sampling signal circuit, and a carrier sampling signal circuit.

Further, the voltage sampling circuit or the voltage sampling circuit includes: one or more of resistor, transformer, voltage transmitter, voltage transformer, capacitor, LC oscillating circuit, voltage stabilizer, discharge tube, diode, triode, silicon controlled rectifier, optocoupler and self-recovery fuse.

Further, the current sampling circuit or the current sampling circuit includes: one or more of a Hall current transformer, a current transducer and a self-recovery fuse.

Further, the power conversion sampling signal circuit includes: the electric energy is converted into one or more of a heat energy sampling signal circuit, an electric energy is converted into an optical energy sampling signal circuit, an electric energy is converted into an acoustic energy sampling signal circuit, an electric energy is converted into a kinetic energy sampling signal circuit and an electric energy is converted into an wind energy sampling signal circuit; the electric energy conversion sampling signal circuit comprises one or more of a resistor, a capacitor, a heating element, a fan, a light emitting diode, a photoelectric device, a loudspeaker, a motor, an electromagnet, an electric relay and a micro fan.

In a preferred embodiment, the contact state monitoring control unit includes: the photoelectric coupler, the first resistor, the current limiting resistor, at least one diode and the power supply VCC; the photoelectric coupler comprises a light emitting diode and a phototriode, wherein the anode of the light emitting diode is connected with the anode of an alarm or locking contact of the gas density relay through a current limiting resistor, the cathode of the light emitting diode is connected with the cathode of the alarm or locking contact of the gas density relay, at least one diode is connected in forward parallel at two ends of the light emitting diode, the collector of the phototriode is connected with a power supply VCC through a first resistor, and the emitter of the phototriode is grounded through a connection unit of the alarm or locking element;

When the alarm or locking contact of the gas density relay does not act, the pressure difference of two ends of the alarm or locking contact of the gas density relay is not zero, the light-emitting diode of the photoelectric coupler emits light to conduct the phototriode, current in the phototriode flows to the emitting electrode from the collecting electrode to provide current for the alarm or locking element connection unit, and the emitting electrode of the phototriode outputs high level;

when the gas density relay alarms or the locking contact acts, the pressure difference at the two ends of the gas density relay alarms or the locking contact is zero, the light emitting diode of the photoelectric coupler does not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level.

In a preferred embodiment, the contact state monitoring control unit includes: the device comprises a Hall current sensor, a first resistor, a second resistor and a microprocessor; one end of the primary side of the Hall current sensor is connected to one end of the power supply unit A, the other end of the primary side of the Hall current sensor is connected with one end of the gas density relay alarm or locking contact, the secondary side of the Hall current sensor is connected with a first resistor and a second resistor in series, the connection part of the first resistor and the second resistor is connected with the microprocessor, the microprocessor is connected with the alarm or locking element connection unit, and the other end of the second resistor is grounded;

When the alarm or locking contact of the gas density relay does not act, tiny currents flow through the primary side and the secondary side of the Hall current sensor, the voltage at two ends of the second resistor is lower than a preset voltage, and the microprocessor controls the alarm or locking element to be connected with a unit and not to be connected;

When the alarm or locking contact of the gas density relay acts, large current flows through the primary side and the secondary side of the Hall current sensor, the voltage at two ends of the second resistor is more than a preset voltage, and the microprocessor controls the alarm or locking element to be connected with the unit.

In a preferred embodiment, the contact state monitoring control unit includes: a self-restoring fuse, a thyristor, and a resistor; the controllable silicon comprises a control end, an input end and an output end, wherein the public end of the input end of the controllable silicon and the input end of the self-recovery fuse is connected with the positive electrode of the power supply unit A, the output end of the controllable silicon is connected with the negative electrode of the power supply unit A through the alarm or locking element connection unit, the control end of the controllable silicon is connected with the output end of the self-recovery fuse through a resistor, and the output end of the self-recovery fuse is also connected with the positive electrode of the alarm or locking contact of the gas density relay through the alarm or locking element connection unit;

when the gas density relay alarms or the locking contact does not act, the voltage of the control end of the silicon controlled rectifier is equal to the voltage of the input end, and the silicon controlled rectifier is cut off;

When the gas density relay alarm or locking contact acts, the current flowing through the self-recovery fuse exceeds the rated current, the self-recovery fuse is disconnected, the voltage on the control end of the silicon controlled rectifier reaches the trigger voltage of the silicon controlled rectifier, and the silicon controlled rectifier is conducted and forms a loop with the power supply unit A and the alarm or locking element connection unit.

In a preferred embodiment, the contact state monitoring control unit includes: the photoelectric coupler, the first resistor and the current limiting resistor; the photoelectric coupler comprises a light emitting diode and a phototriode, wherein the anode of the light emitting diode is connected with the anode of an alarm or locking contact of the gas density relay through a current limiting resistor, the cathode of the light emitting diode is connected with the cathode of the alarm or locking contact of the gas density relay, the collector of the phototriode is connected with the anode of the power supply unit B through a first resistor, and the emitter of the phototriode is connected with the cathode of the power supply unit B through an alarm or locking element;

When the alarm or locking contact of the gas density relay does not act, the pressure difference of two ends of the alarm or locking contact of the gas density relay is not zero, the light-emitting diode of the photoelectric coupler emits light to conduct the phototriode, current in the phototriode flows to the emitting electrode from the collecting electrode to provide current for the alarm or locking element connection unit, and the emitting electrode of the phototriode outputs high level;

when the gas density relay alarms or the locking contact acts, the pressure difference at the two ends of the gas density relay alarms or the locking contact is zero, the light emitting diode of the photoelectric coupler does not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level.

In a preferred embodiment, the contact state monitoring control unit includes: the first resistor, the second resistor, the third resistor and the triode; the collector of the triode is connected with the positive electrode of the alarm or locking contact of the gas density relay through a first resistor, and the emitter of the triode is connected with the negative electrode of the alarm or locking contact of the gas density relay through the alarm or locking element connecting unit; the base electrode of the triode is connected with the positive electrode of the gas density relay alarming or locking contact through a second resistor, and the base electrode of the triode is also connected with the negative electrode of the gas density relay alarming or locking contact through a third resistor;

When the gas density relay alarm or locking contact does not act, the pressure difference of two ends of the gas density relay alarm or locking contact is not zero, partial pressure exists between the second resistor and the third resistor, the triode is conducted, and the emitting electrode of the triode outputs high level;

when the gas density relay alarms or the locking contact acts, the pressure difference at the two ends of the gas density relay alarms or the locking contact is zero, no voltage division exists between the second resistor and the third resistor, the triode is cut off, and the emitting electrode of the triode outputs a low level.

In a preferred embodiment, the contact state monitoring control unit includes: the system comprises a first resistor, a current limiting resistor, a photoelectric coupler, an intelligent control unit, a wireless signal transmitting unit, a wireless signal receiving unit and a MUC control unit, wherein the first resistor, the current limiting resistor, the photoelectric coupler, the intelligent control unit and the wireless signal transmitting unit are arranged on the gas density relay side; the photoelectric coupler comprises a light emitting diode and a phototriode, wherein the anode of the light emitting diode is connected with the anode of an alarm or locking contact of the gas density relay through a current limiting resistor, the cathode of the light emitting diode is connected with the cathode of the alarm or locking contact of the gas density relay, the emitter of the phototriode is grounded, the collector of the phototriode is connected with a power supply VCC through a first resistor, the collector of the phototriode is also connected with the intelligent control unit, and the intelligent control unit is connected with the wireless signal transmitting unit; the MUC control unit is connected with the wireless signal receiving unit; the wireless signal transmitting unit is in wireless communication connection with the wireless signal receiving unit;

When the gas density relay alarm or locking contact does not act, the pressure difference between two ends of the gas density relay alarm or locking contact is not zero, the light emitting diode of the photoelectric coupler emits light, the light turns on the phototriode, the collector of the phototriode outputs a low level to the intelligent control unit, the intelligent control unit sends a first signal outwards through the wireless signal transmitting unit, the wireless signal receiving unit receives the first signal in a wireless transmission mode and sends the first signal to the MUC control unit, and the MUC control unit controls the alarm or locking element to be turned on;

when the gas density relay alarms or the locking contact acts, the pressure difference at two ends of the gas density relay alarms or the locking contact is zero, the light emitting diode of the photoelectric coupler does not emit light, the phototriode is cut off, the collector electrode of the phototriode outputs high level to the intelligent control unit, the intelligent control unit sends out a second signal through the wireless signal transmitting unit, the wireless signal receiving unit receives the second signal in a wireless transmission mode and sends the second signal to the MUC control unit, and the MUC control unit controls the alarm or the locking element to be connected with the unit.

In a preferred embodiment, the contact state monitoring control unit includes: the first voltage stabilizing tube, the second voltage stabilizing tube, the triode and the first resistor; the collector of the triode is connected with the positive electrode of the alarm or locking contact of the gas density relay through a first resistor, and the emitter of the triode is connected with the negative electrode of the alarm or locking contact of the gas density relay through the alarm or locking element connecting unit; the base electrode of the triode is respectively connected with the positive electrode of the first voltage stabilizing tube and the negative electrode of the second voltage stabilizing tube, the negative electrode of the first voltage stabilizing tube is connected with the positive electrode of the gas density relay alarming or locking contact, and the positive electrode of the second voltage stabilizing tube is connected with the negative electrode of the gas density relay alarming or locking contact;

When the gas density relay alarm or locking contact does not act, the pressure difference of two ends of the gas density relay alarm or locking contact is not zero, partial pressure exists between the first voltage stabilizing tube and the second voltage stabilizing tube, the triode is conducted, and the emitting electrode of the triode outputs high level;

When the gas density relay alarms or the locking contact acts, the pressure difference at the two ends of the gas density relay alarms or the locking contact is zero, no partial pressure exists between the first voltage stabilizing tube and the second voltage stabilizing tube, the triode is cut off, and the emitting electrode of the triode outputs low level.

In a preferred embodiment, the contact state monitoring control unit includes: the device comprises an optoelectronic coupler, a first current-limiting resistor, a second current-limiting resistor, a third current-limiting resistor, a capacitor, a rectifying element and a current transformer; the output end of the current transformer is connected with the alternating current side of the rectifying element, the direct current side of the rectifying element is connected with the capacitor, the second resistor and the photoelectric coupler through the third resistor, and the second resistor is connected with the photoelectric coupler in series and then connected with the capacitor in parallel; the photoelectric coupler comprises a first port, a second port, a third port and a fourth port, two light emitting diodes which are connected in reverse parallel are arranged between the first port and the fourth port of the photoelectric coupler, the cathode of the first light emitting diode is connected with the anode of the second light emitting diode and is used as the first port of the photoelectric coupler, and the anode of the first light emitting diode is connected with the cathode of the second light emitting diode and is used as the fourth port of the photoelectric coupler; the second port of the photoelectric coupler is a collector electrode of a phototriode, and the third port of the photoelectric coupler is an emitter electrode of the phototriode; the first port of the photoelectric coupler is connected with the second resistor, the second port of the photoelectric coupler is connected with one end of the power supply unit A through the first current limiting resistor, the third port of the photoelectric coupler is connected with the other end of the power supply unit A through the alarm or locking element connecting unit, and the power supply unit A is an alternating current power supply;

when the gas density relay alarms or the locking contact does not act, the current flowing through the current transformer is small, the two anti-parallel light emitting diodes do not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level;

When the alarm or locking contact of the gas density relay acts, the current flowing through the current transformer is large, the two anti-parallel light emitting diodes are conducted, the phototriode is conducted by light, the current in the phototriode flows from the collector to the emitter, the current is provided for the alarm or locking element switching-on unit, and the emitter of the phototriode outputs high level.

In a preferred embodiment, the contact state monitoring control unit includes: the device comprises an optoelectronic coupler, a first current-limiting resistor, a second current-limiting resistor, a fourth current-limiting resistor, a capacitor, a rectifying element, a current transformer and a DC-AC converter; the input end of the DC-AC converter is connected with the power supply unit A, the output end of the DC-AC converter is connected with the first alternating current input end of the rectifying element, the output end of the DC-AC converter is also connected with the second alternating current input end of the rectifying element through a fourth resistor and a current transformer, the direct current side of the rectifying element is connected with a capacitor, a second resistor and a photoelectric coupler, and the second resistor is connected with the photoelectric coupler in series and then connected with the capacitor in parallel; the photoelectric coupler comprises a first port, a second port, a third port and a fourth port, two light emitting diodes which are connected in reverse parallel are arranged between the first port and the fourth port of the photoelectric coupler, the cathode of the first light emitting diode is connected with the anode of the second light emitting diode and is used as the first port of the photoelectric coupler, and the anode of the first light emitting diode is connected with the cathode of the second light emitting diode and is used as the fourth port of the photoelectric coupler; the second port of the photoelectric coupler is a collector electrode of a phototriode, and the third port of the photoelectric coupler is an emitter electrode of the phototriode; the first port of the photoelectric coupler is connected with the second resistor, the second port of the photoelectric coupler is connected with one end of the power supply unit A through the first current limiting resistor, the third port of the photoelectric coupler is connected with the other end of the power supply unit A through the alarm or locking element connecting unit, and the power supply unit A is a direct current power supply;

when the gas density relay alarms or the locking contact does not act, the current flowing through the current transformer is small, the two anti-parallel light emitting diodes do not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level;

When the alarm or locking contact of the gas density relay acts, the current flowing through the current transformer is large, the two anti-parallel light emitting diodes are conducted, the phototriode is conducted by light, the current in the phototriode flows from the collector to the emitter, the current is provided for the alarm or locking element switching-on unit, and the emitter of the phototriode outputs high level.

In the foregoing, the power VCC may be obtained from a power supply unit, or may be obtained from another power supply on the control closet (or control closet).

Preferably, the alarm or lockout element turn-on unit includes, but is not limited to, one or more of a switch, an electrical contact, an optocoupler, a thyristor, a MOS field effect transistor, a triode, a MOS FET relay, an electromagnetic relay, a solid state relay, a time relay, a power relay, a magnetic latching relay.

Preferably, the power supply unit a and the power supply unit B are the same power supply or are different power supplies independent of each other.

Preferably, the power supply unit a includes a direct current power supply and/or an alternating current power supply, and the power supply unit B includes a direct current power supply and/or an alternating current power supply.

Preferably, the power supply for a gas density monitoring device further includes a protection unit disposed in the first circuit and configured to prevent the power supply unit a from being short-circuited, or to protect a gas density relay alarm or latch contact from being damaged by an excessive current flowing therethrough; the protection unit comprises one or more of a current limiting resistor, a self-recovery fuse, a voltage stabilizing tube and a silicon controlled rectifier.

More preferably, the power supply for a gas density monitoring device further includes a connecting piece disposed in the first loop, where the connecting piece and the alarm or locking element connection unit are integrally disposed and are controlled by the contact state monitoring control unit together, or the connecting piece and the alarm or locking connection unit are separately designed and are controlled by the contact state monitoring control unit respectively; when the protection unit is a self-recovery fuse, the self-recovery fuse is automatically disconnected when the current exceeds the rated current of the self-recovery fuse, the alarm or locking element connection unit is not connected with the alarm or locking element, and the connecting piece is in short circuit with the self-recovery fuse.

Preferably, the power supply for the gas density monitoring device further comprises at least one step-down power supply module and/or an isolation power supply module, wherein the step-down power supply module and/or the isolation power supply module are connected between the power supply unit A and the gas density monitoring device; the step-down power supply module is configured to reduce the voltage output by the power supply unit A to a preset voltage required by the gas density monitoring device; the isolation power supply module is configured to isolate the voltage output by the power supply unit A, and prevent the power supply unit A from interfering with the gas density monitoring device.

More preferably, the isolated power supply module is an isolated DC-DC buck module.

More preferably, the power supply for the gas density monitoring device further comprises an energy storage capacitor, wherein the energy storage capacitor is arranged on the side of the gas density relay, and the energy storage capacitor is arranged on the step-down power supply module and/or the isolation power supply module.

Preferably, the power supply for a gas density monitoring device further includes a regulating resistor connected in series with the alarm or blocking element switching unit in the second circuit.

Preferably, the gas density monitoring device comprises one or more of a bimetal sheet compensated remote gas density relay, a gas compensated remote gas density relay, a bimetal sheet and a gas compensated mixed remote gas density relay, a mechanical remote gas density relay, a digital remote gas density relay, a mechanical and digital combined remote gas density relay, a remote gas density relay with pointer display, a digital remote gas density relay, a remote gas density switch without display or indication, an SF6 remote gas density relay, an SF6 mixed gas remote density relay, an N2 gas remote density relay, a self-diagnosis gas density monitoring device and a self-verification gas density monitoring device.

Preferably, the gas density monitoring device comprises a gas density detection sensor and an intelligent control unit, wherein the gas density detection sensor is connected with the intelligent control unit; or alternatively

The gas density monitoring device comprises a gas density relay body, a gas density detection sensor and an intelligent control unit; the gas density relay body is provided with an alarm and locking contact and is used for monitoring the gas density of the electrical equipment; the gas density detection sensor is communicated with the gas density relay body on a gas path; the intelligent control unit is connected with the gas density detection sensor; or alternatively

The gas density monitoring device comprises an online checking unit, wherein the online checking unit comprises a gas density detection sensor, a pressure regulating mechanism, a valve and an online checking joint signal sampling unit; the gas circuit of the pressure regulating mechanism is communicated with the gas density relay body, and the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas density relay body so as to enable the gas density relay body to generate contact signal action; the gas density detection sensor is communicated with the gas density relay body on a gas path; the on-line checking contact signal sampling unit is directly or indirectly connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body; one end of the valve is provided with an air inlet communicated with electrical equipment, the other end of the valve is communicated with an air passage of the gas density relay body, or the other end of the valve is connected with the air passage of the pressure regulating mechanism, so that the valve is communicated with the air passage of the gas density relay body; the intelligent control unit is respectively connected with the pressure regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit to complete the control of the pressure regulating mechanism, the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition and detect the joint signal action value and/or the joint signal return value of the gas density relay body; or alternatively

The gas density monitoring device comprises a density monitoring device with a self-diagnosis function;

Wherein the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or the gas density detection sensor is a gas density transmitter consisting of a pressure sensor and a temperature sensor; or the gas density detection sensor is a density detection sensor adopting quartz tuning fork technology.

Preferably, the gas density monitoring device further comprises a communication module for realizing remote transmission of test data and/or verification results, and the communication mode of the communication module is a wireless communication mode or a wired communication mode.

The second aspect of the present application provides a method for implementing a power supply for a gas density monitoring device, including:

The alarm or locking element connecting unit is arranged on the side of a control cabinet (or a control cabinet) or the side of a gas density relay, and is connected with the alarm or locking element in series, so that the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit are connected to form a second loop;

The contact state monitoring control unit is arranged at the side of a control cabinet (or a control cabinet) and/or the side of a gas density relay, and is connected with an alarm or locking contact of the gas density relay, so that the power supply unit A, the contact state monitoring control unit and the alarm or locking contact of the gas density relay are connected to form a first loop; simultaneously, the contact state monitoring control unit is connected with the alarm or locking element connecting unit; the contact state monitoring control unit monitors the contact state of the gas density relay alarm or locking contact and controls the on-off of the alarm or locking element switching-on unit according to the contact state;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in a non-action state, the contact state monitoring control unit controls the alarm or locking element connection unit not to connect the alarm or locking element, namely, the second loop is disconnected, so that the power supply unit A supplies power to the gas density monitoring device at the gas density relay side through a cable line of the first loop;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, namely the second loop is conducted, so that the power supply unit B supplies power to the alarm or locking element through a cable line of the second loop.

The third aspect of the present application provides a method for modifying a power supply for a gas density monitoring device, comprising:

Providing a contact state monitoring control unit and an alarm or locking element switching-on unit;

The alarm or locking element connecting unit is arranged on the side of a control cabinet (or a control cabinet) or the side of a gas density relay, and is connected with the alarm or locking element in series, so that the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit are connected to form a second loop;

The method comprises the steps that a contact state monitoring control unit is arranged on a control cabinet (or a control cabinet) side and/or a gas density relay side, the contact state monitoring control unit is connected with a gas density relay alarm or locking contact, so that a power supply unit A, the contact state monitoring control unit and the gas density relay alarm or locking contact are connected to form a first loop, and meanwhile, the contact state monitoring control unit is connected with an alarm or locking element connection unit, so that the contact state monitoring control unit monitors the contact state of the gas density relay alarm or locking contact, and the on-off of the alarm or locking element connection unit is controlled according to the contact state;

Such that:

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in a non-action state, the contact state monitoring control unit controls the alarm or locking element connection unit not to connect the alarm or locking element, namely, the second loop is disconnected, so that the power supply unit A supplies power to the gas density monitoring device at the gas density relay side through a cable line of the first loop;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, namely the second loop is conducted, so that the power supply unit B supplies power to the alarm or locking element through a cable line of the second loop.

Preferably, the contact state monitoring control unit and/or the alarm or blocking element switching-on unit do not influence the operation of the alarm or blocking circuit.

Preferably, the power supply for a gas density monitoring device further comprises a protection unit, wherein the protection unit is arranged in the first loop and is configured to prevent the power supply unit A from being short-circuited or protect a gas density relay alarm or locking contact from being damaged due to the fact that excessive current flows through the gas density relay alarm or locking contact; the protection unit comprises one or more of a current limiting resistor, a self-recovery fuse, a voltage stabilizing tube and a silicon controlled rectifier.

Preferably, the contact state monitoring element includes any one of a voltage sampling circuit, a current sampling circuit, an electric energy conversion sampling signal circuit, and a carrier sampling signal circuit.

Preferably, the contact state monitoring control unit comprises a contact state monitoring element and a control element, wherein the contact state monitoring element monitors the contact state of the alarm or locking contact of the gas density relay, and the control element controls the on-off of the alarm or locking element on-off of the unit according to the contact state.

Preferably, the power supply for the gas density monitoring device further comprises at least one step-down power supply module and/or an isolation power supply module, wherein the step-down power supply module and/or the isolation power supply module are connected between the power supply unit A and the gas density monitoring device; the step-down power supply module reduces the voltage output by the power supply unit A to a preset voltage required by the gas density monitoring device; the isolation power supply module isolates the voltage output by the power supply unit A, and prevents the power supply unit A from interfering the gas density monitoring device.

More preferably, the power supply for the gas density monitoring device further comprises an energy storage capacitor, wherein the energy storage capacitor is arranged on the gas density relay side, and the energy storage capacitor is arranged on the step-down power supply module and/or the isolation power supply module; when the contact state monitoring control unit monitors that the gas density relay alarms or the locking contact is in an action state, the energy storage capacitor supplies power to the gas density monitoring device.

Compared with the prior art, the technical scheme of the invention has the following beneficial effects:

The application provides a power supply for a gas density monitoring device, an implementation method and a transformation method thereof, which are used for high-voltage and medium-voltage electrical equipment. When the contact point state monitoring control unit monitors that the gas density relay alarm or locking contact point is in a non-action state, the contact point state monitoring control unit controls the alarm or locking element switching-on unit not to be switched on, so that the second loop is not conducted, and the power supply unit A supplies power to a gas density monitoring device at the gas density relay side through a cable of the original alarm or locking loop; when the contact state monitoring control unit monitors that the gas density relay alarms or locks the contact to be in an action state, the contact state monitoring control unit controls the alarm or locking element to be connected, so that the second loop is connected, and the power supply unit B supplies power to the alarm or locking element, so that the alarm or locking element sends out a corresponding alarm or locking signal. The power supply for the gas density monitoring device is used for modifying the existing alarming or locking cable, so that the existing alarming or locking function can be realized, the gas density monitoring device can be conveniently powered, the gas density monitoring device is not required to be re-wired for acquiring the power supply, and the technical scheme of the application can be applied to newly-built substations, so that the cost is saved. The technical scheme of the application can reduce the cable and construction cost, save the construction cost, improve the construction and installation efficiency and accelerate the popularization of intelligent monitoring of the gas density. The technical scheme of the application can be implemented in the running transformer substation by combining the existing alarm (or locking) loop. The technical scheme of the application is also suitable for newly built substations.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic diagram of an alarm circuit of a prior art gas density relay;

FIG. 2 is a schematic diagram of a power circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention;

FIG. 3 is a schematic diagram of another power circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention;

FIG. 4 is a schematic diagram of another power circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention;

FIG. 5 is a schematic diagram of another power circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of another power circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention;

FIG. 7 is a schematic diagram of another power circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention;

FIG. 8 is a schematic diagram of another power circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention;

FIG. 9 is a schematic diagram of another power circuit for a gas density monitoring apparatus in accordance with a preferred embodiment of the present invention;

FIG. 10 is a schematic diagram of another power supply circuit for a gas density monitoring apparatus according to a preferred embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Embodiment one:

Fig. 2 is a schematic diagram of a power supply circuit for a gas density monitoring device of a high-voltage and medium-voltage electrical apparatus according to a first embodiment of the present invention. As shown in fig. 2, a power supply for a gas density monitoring device includes: the gas density relay 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure regulating mechanism 5 (mainly used for regulating pressure), the on-line checking contact signal sampling unit 6 and the intelligent control unit 7, the power supply 8 (namely the power supply unit A and the power supply unit B are the same direct current power supply 8 in the embodiment), the protection unit 9, the contact state monitoring control unit 10, the alarm or locking element switching-on unit 11, the alarm or locking element 12, the alarm (or locking) contact PJ of the gas density relay 1, the first step-down power supply module 20, the second step-down power supply module 21, the isolation power supply module 22 and the energy storage capacitor 23. Wherein, the power supply 8, the contact state monitoring control unit 10 and the alarm (or locking) contact PJ of the gas density relay 1 are connected to form a loop, namely a first loop; the power supply 8, the alarm or blocking element 12 (in this case an intermediate relay ZJ, or an alarm lamp BJD) and the alarm or blocking element switching-on unit 11 are connected to form a new alarm or blocking circuit, i.e. a second circuit. The contact state monitoring control unit 10 is disposed at a side of a junction box (or a control cabinet), the contact state monitoring control unit 10 is connected with an alarm (or locking) contact PJ and with an alarm or locking element switching-on unit 11, configured to monitor a contact state of the alarm (or locking) contact PJ of the gas density relay 1, and to control switching of the alarm or locking element switching-on unit 11 according to the contact state. The contact state monitoring control unit 10 does not affect the operation of the control loop (i.e., alarm or latch loop, or first loop) of the alarm (or latch) contact PJ of the gas density relay 1.

Specifically, in the present embodiment, the contact state monitoring control unit 10 mainly includes a resistor R _{High height} (i.e., a current limiting resistor), diodes D1, D2, D3, an optocoupler OC1 (i.e., a photocoupler), a resistor R1 (i.e., a first resistor), and a power source VCC. The optocoupler OC1 comprises a light emitting diode and a phototransistor. As shown in fig. 2, in the control circuit of the original alarm (or blocking) junction PJ (i.e., the alarm or blocking junction circuit), the anode of the light emitting diode is connected in parallel with the positive terminal of the alarm (or blocking) junction PJ of the gas density relay 1 through a resistor R _{High height}, and the cathode of the light emitting diode is connected in parallel with the negative terminal of the alarm (or blocking) junction PJ of the gas density relay 1. Diodes D1, D2 and D3 are connected in parallel in the forward direction at two ends of the light emitting diode, and the diodes D1, D2 and D3 are connected in series. The diodes D1, D2, D3 mainly protect the light emitting diode of the optocoupler OC1 from high voltage breakdown. The collector of the phototransistor is connected to the power supply VCC via a resistor R1 and the emitter of the phototransistor is connected to the ground via a control coil 11_XQ of the unit 11 via an alarm or blocking element. The resistor R _{High height} may be a resistor with a proper large resistance value, or may be replaced by a discharge tube or a voltage stabilizing tube, and the resistor R _{High height} is matched with the power supply 8 in the existing loop of the alarm (or blocking) junction PJ of the gas density relay 1, and the matching principle is that: under normal conditions, when the alarm (or locking) joint PJ of the gas density relay 1 does not act, the resistance value of the resistor R _{High height} can enable the light-emitting diode of the optical coupler OC1 to reliably work; the power source VCC may be taken from the power source 8 or from another power source on the control cabinet (or control cabinet).

In this embodiment, a protection unit 9 (which may be a resistor or a self-restoring fuse) is connected between the positive terminal of the alarm (or latch) junction PJ and the positive terminal of the power supply 8. The light emitting diode of the optocoupler OC1, the resistor R _{High height}, the protection unit 9 and the power supply 8 are connected in series to form a loop.

The working principle is as follows: when the alarm (or locking) joint PJ does not act, the differential pressure between two ends of the alarm (or locking) joint PJ is not zero, the light emitting diode of the optocoupler OC1 emits light, the light turns on the phototriode, the current in the phototriode flows to the emitter from the collector to supply current to the alarm or locking element switching unit 11, so that the control coil 11_XQ of the alarm or locking element switching unit 11 is switched on and powered on, the joint K11 of the alarm or locking element switching unit 11 is not conducted, that is, the pins a1 and b1 are not switched on, so that the alarm or locking element 12 does not work, that is, when the joint state monitoring control unit 10 monitors that the alarm (or locking) joint PJ is in a non-acting state, the joint state monitoring control unit 10 controls the alarm or locking element switching unit 11 not to switch on the alarm or locking element 12, and the power supply 8 can supply power to the gas density monitoring device on the side of the gas density relay 1 through the cable of the original alarm or locking loop.

When the alarm (or locking) junction PJ acts, the voltage difference between the two ends of the alarm (or locking) junction PJ is zero, the electric potential between the two ends of the light emitting diode is zero, the light emitting diode of the optocoupler OC1 does not emit light, at this time, the phototransistor is turned off, the control coil 11_XQ of the alarm or locking element switching-on unit 11 is not switched on, no power is received, and the junction K11 of the alarm or locking element switching-on unit 11 is further turned on, and the pins a1 and b1 are switched on. In this way, the power supply 8, the alarm or blocking element 12 (in this case, the intermediate relay ZJ, or the alarm lamp BJD) and the alarm or blocking element connection unit 11 are connected to form a loop in which the alarm (or blocking) signal is turned on, i.e. the second loop, and the intermediate relay ZJ (or the alarm lamp BJD) is operated to emit a corresponding alarm signal. That is, the alarm or locking element switching-on unit 11 is controlled by the alarm (or locking) contact PJ of the gas density relay 1 and the contact state monitoring control unit 10, and when the contact state monitoring control unit 10 monitors that the alarm (or locking) contact PJ is in the action state, the contact state monitoring control unit 10 controls the alarm or locking element switching-on unit 11 to switch on the alarm or locking element 12, and issues a corresponding alarm or locking signal.

Further, the power supply for the gas density monitoring device is further provided with a first step-down power supply module 20, a second step-down power supply module 21, an isolation power supply module 22 and an energy storage capacitor 23. As shown in fig. 2, the power supply 8 obtains a power supply (voltage V1, for example, 24V) through the first step-down power supply module 20, and the power supply (voltage V1) can supply power to the valve 4 and the pressure regulating mechanism 5. Meanwhile, the power supply (voltage V1) is reduced by the second voltage reduction power supply module 21 to obtain a power supply with voltage of 5V, the isolated power supply with voltage of 5V is obtained by the isolation function of the isolation power supply module 22, the anti-interference capability of the power supply is improved by isolation, and then power is supplied to the pressure sensor 2, the temperature sensor 3, the on-line check contact signal sampling unit 6 and the intelligent control unit 7 of the gas density monitoring device. The storage capacitor 23 is disposed at the output end of the isolated power module 22, and after the alarm (or lock-up) junction PJ acts, the power supply 8 cannot supply power to the gas density monitoring device, but the storage capacitor 23 can continue to supply power to the gas density monitoring device for a period of time. At this time, the air leakage of the electrical equipment is alarmed, and the operation and maintenance staff should go to the site to deal with the problem. During the handling of the gas leakage problem, the storage capacitor 23 can continue to supply power to the gas density monitoring device and can transmit relevant monitoring information and signals during the recovery from the normal state.

Referring to fig. 1, assuming that the power supply 8 is a DC220v power supply, the coil resistance of the intermediate relay ZJ is 13000 Ω, and the minimum starting voltage of the intermediate relay ZJ is typically 80% of its rated voltage, this can result in 220 x 0.8=176 v,176 v/13000=0.01335 a,220v-176 v=44 v,44v x 0.0135=0.594 w, that is, to ensure reliable operation of the alarm or latch circuit shown in fig. 1, only about 0.594w of power can be output. This is far from adequate for completing monitoring gas density, monitoring data and information by wireless transmission, and not to mention completing the on-line verification of gas density relays. Referring to fig. 2, assuming that the protection unit 9 employs a resistor with a resistance value of 50Ω, when the alarm (or blocking) junction PJ is not operated, the power supply 8 may supply power to the gas density monitoring device on the gas density relay 1 side through the cable line of the alarm (or blocking) loop, for example, through a current of 0.65A, the voltage drop of the protection unit 9 employing the resistor with the resistance value of 50Ω is 50 x 0.65=32.5v, 220 v-32.5v=187.5v, so that the power supply outputting about 121.9W (187.5v×0.65a=121.9w) power may supply power to the gas density monitoring device, The on-line verification work can be completed. Of course, a 120-watt power supply is not actually required. The specific principle is as follows: when the gas density is normal and the alarm (or locking) joint PJ does not act, the intelligent control unit 7 is powered, and the intelligent control unit 7 obtains a corresponding 20 ℃ pressure value P₂₀ (namely a gas density value) according to the gas pressure P and the temperature T of the electrical equipment monitored by the pressure sensor 2 and the temperature sensor 3. When the gas density relay 1 needs to be checked, if the gas density value P₂₀ is more than or equal to the set safety check density value P_S, the intelligent control unit 7 controls the valve 4 to be closed, so that the gas density relay 1 is isolated from electrical equipment on a gas path. then, the intelligent control unit 7 controls to disconnect the contact signal control loop of the gas density relay 1, namely, the normally closed contacts J11 and J12 of the first relay J1 of the on-line checking contact signal sampling unit 6 are disconnected, so that the safety operation of the electrical equipment is not affected when the gas density relay 1 is checked on line, and an alarm signal is not sent out by mistake or the control loop is locked when the gas density relay 1 is checked on line. Because the monitoring and judgment of the safety check density value P_S set at or above the gas density value P₂₀ is already performed before the start of the check, the gas leakage of the electrical equipment is a slow process within the safety operation range, and the check is safe. Meanwhile, a contact sampling circuit of the contact of the gas density relay 1 is communicated through the intelligent control unit 7, namely normally open contacts J21 and J22 of a second relay J2 of the online checking contact signal sampling unit 6 are closed, and at the moment, a contact P_J of the gas density relay 1 is connected with the intelligent control unit 7 through the normally open contacts J21 and J22 of the second relay J2. Then, the intelligent control unit 7 controls the driving part of the pressure regulating mechanism 5, so as to regulate the pressure regulating mechanism 5 to change the volume, so that the pressure of the gas density relay 1 gradually decreases, the gas density relay 1 generates a contact signal action, the contact signal action is uploaded to the intelligent control unit 7 through the second relay J2 of the on-line checking contact signal sampling unit 6, the intelligent control unit 7 converts the pressure value P and the temperature T measured during the contact signal action into a pressure value P20 (density value) corresponding to 20 ℃ according to the gas characteristic, and then the contact action value P_D20 of the gas density relay 1 can be detected. After all the contact signal action values of the alarm and/or locking signals of the gas density relay 1 are detected, the intelligent control unit 7 controls the motor (motor or variable frequency motor) of the pressure regulating mechanism 5, the pressure regulating mechanism 5 is regulated, the pressure of the gas density relay 1 is gradually increased, and the return value of the alarm and/or locking contact signals of the gas density relay 1 is tested. The verification is repeated a plurality of times (for example, 2 to 3 times) and then the average value is calculated, thus completing the verification work of the gas density relay 1. After the verification is completed, the normally open contacts J21 and J22 of the second relay J2 of the on-line verification contact signal sampling unit 6 are disconnected, and at this time, the alarm (or locking) contact PJ of the gas density relay 1 is disconnected from the intelligent control unit 7 by disconnecting the normally open contacts J21 and J22 of the second relay J2. The intelligent control unit 7 controls the valve 4 to be opened so that the gas density relay 1 is communicated with the electrical equipment on the gas path. Then, normally closed contacts J11 and J12 of a first relay J1 of the on-line checking contact signal sampling unit 6 are closed, a contact signal control loop of the gas density relay 1 works normally, and the gas density relay monitors the gas density of the electrical equipment safely, so that the electrical equipment works safely and reliably. Thus, the on-line checking work of the gas density relay 1 is conveniently completed, and the safe operation of the electrical equipment is not influenced.

In a word, this embodiment has solved the power problem of gas density monitoring devices, in the transformer substation of operation, as long as at the side of the control cabinet (or switch board), carry out technical transformation to its warning or locking return circuit, utilize the cable wire of original warning or locking return circuit, just can conveniently obtain the working power supply of gas density monitoring devices, realize gas density on-line monitoring, little water on-line monitoring, the on-line monitoring of decomposition thing, gas density relay on-line diagnosis or check-up, then pass through wireless communication mode and upload the information or the data of monitoring or diagnosis to the target equipment, need not to redistribute the cable wire, cost is saved greatly, the problem that the wiring is wasted time and energy has been solved, the industry pain point that gas density monitoring devices obtained the power difficulty has been solved. of course, the technical scheme of the embodiment can also be applied to new substation construction, and also can save a lot of cost. The wireless communication mode can be 2G/3G/4G/5G, WIFI, bluetooth, lora, loRawan, zigBee, infrared, ultrasonic, sound wave, satellite, light wave, quantum communication, sonar, a 5G/NB-IOT communication module (such as NB-IOT) built in a sensor and the like. In a word, the reliable performance of the gas density monitoring device can be fully ensured by multiple modes and multiple combinations. In the transformation of a transformer substation, the method comprises the following steps: providing a contact state monitoring control unit and an alarm or locking element switching-on unit; the alarm or locking element connecting unit is arranged on the side of the control cabinet or the gas density relay, and is connected with the alarm or locking element in series, so that the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit are connected to form a second loop; the method comprises the steps that a contact state monitoring control unit is arranged on a control cabinet side and/or a gas density relay side, the contact state monitoring control unit is connected with an alarm or locking contact of the gas density relay, a first loop is formed by connecting a power supply unit A, the contact state monitoring control unit and the alarm or locking contact of the gas density relay, meanwhile, the contact state monitoring control unit is connected with an alarm or locking element connection unit, the contact state monitoring control unit monitors the contact state of the alarm or locking contact of the gas density relay, and the on-off of the alarm or locking element connection unit is controlled according to the contact state; Such that: when the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in a non-action state, the contact state monitoring control unit controls the alarm or locking element connection unit not to connect the alarm or locking element, namely, the second loop is disconnected, so that the power supply unit A supplies power to the gas density monitoring device at the gas density relay side through a cable line of the first loop; when the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, namely the second loop is conducted, so that the power supply unit B supplies power to the alarm or locking element through a cable line of the second loop. therefore, the cable of the alarm or locking loop can be used for acquiring the power supply of the gas density monitoring device, no additional power supply wire is required to be arranged for acquiring the power supply, the cable is saved, and the cost is reduced.

In the technology of the invention, the alarm or locking element, the power supply unit A, the power supply unit B and the gas density relay alarm or locking contact point are existing in a transformer substation, and the alarm or locking element, the power supply unit A and the power supply unit B are arranged at the side of a control cabinet; or the alarm or locking element, the power supply unit A and the power supply unit B are existing in the transformer substation, and are arranged on the side of the control cabinet. That is, the power supply for the gas density monitoring device combines the existing alarm or locking loop of the transformer substation, the power supply unit A and the power supply unit B thereof, and implements the whole scheme or organically combines the scheme. The gas density monitoring device can be modified or upgraded by utilizing the existing density relay of the transformer substation. The power supply unit a and the power supply unit B may be combined into one, i.e. only one power supply unit a.

Embodiment two:

As shown in fig. 3, a power supply for a gas density monitoring device includes: the power supply 8, the protection unit 9, the contact state monitoring control unit 10, the alarm or blocking element switching-on unit 11, the alarm or blocking element 12, the alarm (or blocking) contact PJ of the gas density relay 1, the rectifying element 19, the first step-down power supply module 20, the second step-down power supply module 21, the isolation power supply module 22, and the energy storage capacitor 23.

The contact state monitoring control unit 10 is disposed at the side of the control cabinet (or control cabinet) and is used for collecting contact state information of an alarm (or locking) contact PJ of the gas density relay 1. In this embodiment, the contact state monitoring control unit 10 includes a current sampling circuit, and the current sampling circuit includes a hall current sensor H1, a resistor R1 (first resistor), a resistor R2 (second resistor), and a microprocessor MUC1001. One end of the primary side of the Hall current sensor H1 is connected to one end of the power supply 8, the other end of the primary side of the Hall current sensor H1 is connected in series with one end of the protection unit 9, the other end of the protection unit 9 is connected with one end of an alarm (or locking) joint PJ of the gas density relay 1, and the other end of the alarm (or locking) joint PJ is connected with the other end of the power supply 8. The alarm or locking element 12 and the alarm or locking element switching-on unit 11 are connected in series and then connected in parallel at two ends of the power supply 8. Thus, the loop formed by the connection of the hall current sensor H1, the power supply 8, and the alarm (or blocking) junction PJ is a first loop, and the new alarm or blocking loop formed by the connection of the power supply 8, the alarm or blocking element 12, and the alarm or blocking element switching-on unit 11 is a second loop. The secondary side of the hall current sensor H1 is connected in series with resistors R1 (first resistor) and R2 (second resistor). The connection of the resistors R1 and R2 is connected to the microprocessor MUC1001, which microprocessor MUC1001 is in turn connected to the alarm or blocking element switching unit 11; the other end of the resistor R2 is grounded.

The power supply for the gas density monitoring device in the present case, the implementation method and the modification method thereof, the working principle is as follows: when the alarm (or locking) joint PJ does not act, the alarm (or locking) joint PJ is in an off state, a small current flows through the primary side of the Hall current sensor H1, a small current also flows through the secondary side of the Hall current sensor H1, the resistor R2 has low voltage, and the microprocessor MUC1001 can monitor the voltage with the corresponding amplitude; at this time, the microprocessor MUC1001 controls the contact K11 of the alarm or latch element switching unit 11 to be non-conductive, i.e., the pins a1 and b1 are non-conductive, so that the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side through the cable line of the alarm or latch circuit (i.e., the first circuit). Specifically, after the power supply 8 is rectified by the rectifying element 19, the voltage is reduced by the first voltage reduction power supply module 20, then reduced by the second voltage reduction power supply module 21, a power supply with the voltage of 5v is obtained, and then the isolated power supply with the voltage of 5v is obtained through the isolation function of the isolation power supply module 22, so that the anti-interference capability is improved, and then the power is supplied to the gas density monitoring device. The storage capacitor 23 is disposed at the output of the isolated power module 22.

When the alarm (or lock-up) junction PJ is activated, a larger current flows through the primary side of the hall current sensor H1, which is about the resistance value obtained by dividing the power supply 8 by the protection unit 9, and a correspondingly larger current flows through the secondary side of the hall current sensor H1, and a correspondingly larger voltage value is provided on the resistor R2, and the microprocessor MUC1001 can monitor the larger voltage value. Thus, the microprocessor MUC1001 may control the alarm or locking element switching unit 11 (in this case, a relay) to receive power, so that the contact K11 of the alarm or locking element switching unit 11 is turned on, i.e. the pins a1 and b1 are turned on. Referring to fig. 3, the power supply 8, the alarm or blocking element 12 (in this case, the intermediate relay ZJ, or the alarm lamp BJD), and the contact K11 of the alarm or blocking element-on unit 11 are connected to form a second loop, and the intermediate relay ZJ (or the alarm lamp BJD) is operated to emit a corresponding alarm signal. That is, when the contact state monitoring control unit 10 monitors the action state of the alarm (or latch) contact PJ, the contact state monitoring control unit 10 controls the alarm or latch element switching-on unit 11 to switch on the alarm or latch element 12. At this time, although the power supply 8 cannot supply power to the gas density monitoring device, the storage capacitor 23 can continue to supply power to the gas density monitoring device for a while. At this time, the leakage of the electrical equipment is alarmed, and workers should go to the site to deal with the problem. During the handling of the gas leakage problem, the storage capacitor 23 can continue to supply power to the gas density monitoring device and can transmit relevant monitoring information and signals during the recovery from the normal state.

In this embodiment, the state of the alarm (or locking) junction PJ is known by monitoring the corresponding change of the current of the hall current sensor H1, and then the on-off of the alarm or locking element on-off unit 11 is controlled by the judgment of the microprocessor MUC1001, so as to realize the power supply of the power supply 8 to the gas density monitoring device and the control of the alarm or locking element 12.

Embodiment III:

As shown in fig. 4, a power supply for a gas density monitoring device includes: the gas density relay body 1, the pressure sensor 2, the temperature sensor 3, the valve 4, the pressure adjusting mechanism 5 (mainly for adjusting pressure), the temperature adjusting mechanism 18 (mainly for adjusting temperature), the on-line check contact signal sampling unit 6 and the intelligent control unit 7, the power supply 8 (DC 220V power supply, or DC110V power supply), the protection unit, the contact state monitoring control unit 10, the alarm or blocking element switching-on unit 11, the connecting piece K11 b, the alarm or blocking element 12, the alarm (or blocking) contact PJ of the gas density relay 1, the rectifying element 19, the first step-down power supply module 20, the second step-down power supply module 21, the isolation power supply module 22, and the energy storage capacitor 23.

In this embodiment, the alarm or blocking element switching unit 11 may include, but is not limited to, one or more of a switch, an electrical contact, an optocoupler, a thyristor, an electrical controller, a MOS field effect transistor, a triode, a MOS FET relay, an electromagnetic relay, a solid state relay, a time relay, a power relay, and a magnetic latching relay. In this embodiment, a pair of normally open relays, a pair of normally closed relays, or an open-close relay (with a common terminal) may be used.

In this embodiment, the contact state monitoring control unit 10 is disposed at the side of a control cabinet (or control cabinet), and mainly comprises a self-recovery fuse FU1, a silicon controlled rectifier SCR, and a resistor R1. The SCR comprises a control end G, an input end A and an output end K, wherein the input end A of the SCR and the input end of the self-recovery fuse FU1 are commonly connected with the positive electrode of the power supply 8, the output end of the SCR is connected with the negative electrode of the power supply 8 through a control coil 11_XQ of the alarm or locking element switching-on unit 11, the control end G of the SCR is connected with the output end of the self-recovery fuse FU1 through a resistor R1, and the output end of the self-recovery fuse FU1 is connected with the positive electrode of an alarm (or locking) joint PJ of the gas density relay 1 through d and e pins of a connecting piece K11b of the alarm or locking element switching-on unit 11.

The power supply for the gas density monitoring device in the present case, the implementation method and the modification method thereof, the working principle is as follows: in the power-on initial state, the power supply anode of the power supply 8 (DC 220V power supply) is connected to the rectifying element (DB 1) 19 through the self-recovery fuse FU1 and the d and e pins of the connection member K11b of the alarm or latch element switching-on unit 11, and then returns to the power supply cathode of the power supply 8 to form a loop, and the power (for example, the output is DC 24V) of the first step-down power supply module 20 is supplied. At this time, the A pin and the G pin of the SCR are the same in potential and are not conducted. That is, when the contact state monitoring control unit 10 detects that the alarm (or latch) contact PJ is in the non-operation state, the pins a1 and b1 of the contact K11a are not conducted, that is, the contact state monitoring control unit 10 controls the alarm or latch element turning-on unit 11 not to turn on the alarm or latch element 12, so that the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side through the self-restoring fuse FU1, the connecting pieces K11b (d and e pins), and the cable of the alarm or latch circuit (i.e., the first circuit). Further, the power supply 8 obtains a power supply (voltage V1, for example, 24V) through the rectifying element 19 and the first step-down power supply module 20 (step-down to 24V), and the power supply (voltage V1) can supply power to the valve 4 and the pressure regulating mechanism 5. Meanwhile, the power supply (voltage V1) is reduced through the second voltage reduction power supply module 21 to obtain a power supply with voltage of 5V, the isolated power supply with voltage of 5V is obtained through the isolation function of the isolation power supply module 22, the anti-interference capability is improved, and then power is supplied to the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent control unit 7 of the gas density monitoring device. The energy storage capacitor 23 is arranged at the output end of the isolation power supply module 22, and after the power supply of the power supply 8 is lost after the alarm junction PJ acts, the energy storage capacitor 23 can continuously supply power to the gas density monitoring device for a period of time.

When the alarm (or blocking) junction PJ is operated, i.e., the alarm (or blocking) junction PJ is closed, at this time, the current flowing through the self-recovery fuse FU1 exceeds the operation current thereof, so that the self-recovery fuse FU1 is opened (i.e., turned off), the a and G pins of the SCR are conducted with different electric potentials, the positive electrode (DC 220 v+) of the power supply 8 is conducted, the pin of the control coil 11_XQ (KM 1 relay control coil 11_XQ) of the alarm or blocking element switching-on unit 11 is returned to the negative electrode (DC 220V-) of the power supply 8, a loop is formed, the control coil 11_XQ (KM 1 relay control coil 11_XQ) of the alarm or blocking element switching-on unit 11 is electrified, the KM1 relay is closed, i.e., the pin of the connecting piece K11b of the alarm or blocking element switching-on unit 11 is opened, the pin of the contact K11a is conducted (i.e., pins a1 and c1 is conducted), and the pin of the control coil 11a and the pin of the KM1 of the alarm or blocking element switching-on unit 11 is conducted, the contact 11a and the contact 11a (i.e., pin a1 and c 1) of the alarm or blocking element unit 11 is conducted, and the corresponding junction (j) is conducted, so that the alarm or blocking signal is conducted, the alarm junction 12 is formed.

In this embodiment, the contact state monitoring and controlling unit 10 mainly adopts a self-recovery fuse, and the operation current of the self-recovery fuse is assumed to be 0.8A. When the alarm (or blocking) contact PJ is not activated, the connection K11b of the alarm or blocking element connection unit 11 is turned on, i.e. pins d and e are turned on, so that the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side through the cable of the alarm or blocking loop (i.e. the first loop), for example, through a current of 0.5A, so that the power supply outputting about 110W (220 v 0.5a=110W) can supply power to the gas density monitoring device, and thus, the online verification or diagnosis work can be completed.

Embodiment four:

As shown in fig. 5, a power supply for a gas density monitoring device includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5 (for regulating pressure), a temperature regulating mechanism 18 (for regulating temperature), an on-line checking joint signal sampling unit 6 and a intelligent control unit 7, a power supply 8B (namely, the power supply unit A and the power supply unit B are respectively two different power supplies of the power supply 8 and the power supply 8B in the embodiment), a protection unit 9 (comprising 9A and 9B in fig. 5), a joint state monitoring control unit 10, an alarm or locking element connecting unit 11, a connecting piece K11B, an alarm or locking element 12, an alarm (or locking) joint PJ of the gas density relay 1, a rectifying element 19, a first step-down power supply module 20, a second step-down power supply module 21, an isolation power supply module 22 and an energy storage capacitor 23.

In this embodiment, the contact state monitoring control unit 10 is disposed on the side of a control cabinet (or control cabinet), and mainly comprises a resistor R _{High height} (i.e., a current limiting resistor), an optocoupler OC1 (i.e., a photoelectric coupler), and a resistor R1 (i.e., a first resistor), where the optocoupler OC1 includes a light emitting diode and a phototransistor, an anode of the light emitting diode is connected to an anode of the alarm (or blocking) contact PJ through a resistor R _{High height}, a cathode of the light emitting diode is connected to a cathode of the alarm (or blocking) contact PJ, a collector of the phototransistor is connected to an anode of the power supply 8B through a resistor R1, and an emitter of the phototransistor is connected to a cathode of the power supply 8B through a control coil 11_XQ of the alarm or blocking element switching-on unit 11. The alarm or blocking element switching unit 11 includes, but is not limited to, one or more of a switch, an electrical contact, an optocoupler, a thyristor, an electrical controller, a MOS field effect transistor, a triode, a MOS FET relay, an electromagnetic relay, a solid state relay, a time relay, a power relay, a magnetic latching relay, in this embodiment a pair of normally open, a pair of normally closed relays, or an open and a closed relay (with a common terminal) may be used. In this embodiment, as shown in fig. 5, the protection unit 9 includes a resistor (Rb 1) 9A and a self-recovery fuse (FU 1) 9B, where the self-recovery fuse (FU 1) 9B functions to protect the power supply 8 and the alarm (or latch) junction PJ from an excessive current impact; the resistor (Rb 1) 9A mainly plays a role of protecting the circuit from reliable operation, preventing the power supply 8 from being able to supply the operation power to the contact state monitoring control unit 10 when the pins a2 and c2 of the connector K11b are not turned on. That is, even if the pins a2 and c2 of the connector K11b are not turned on, the power supply 8 can supply the operating power to the contact state monitoring control unit 10 through the resistor (Rb 1) 9A, and when the alarm (or latch) contact PJ of the gas density relay 1 is in the non-operating state, the connector K11b (the pins a2 and c2 are turned on) is turned on, so that the power supply 8 can supply the power to the gas density monitoring device on the gas density relay 1 side through the cable of the connector K11b (the pins a2 and c2 are turned on), the protection unit 9, and the original alarm or latch circuit (i.e., the first circuit), thereby functioning as a protection circuit to reliably operate, preventing the occurrence of the non-operating state.

The power supply for the gas density monitoring device in the present case, the implementation method and the modification method thereof, the working principle is as follows: the contact state monitoring control unit 10 in this embodiment is a voltage sampling circuit. When the alarm (or blocking) contact PJ is in a non-action state, the light emitting diode of the optocoupler OC1 emits light, and the light turns on the phototransistor, so that the control coil 11_XQ of the alarm or blocking element switching unit 11 is switched on and receives power, the contact K11a of the alarm or blocking element switching unit 11 is not turned on, i.e., the pins a1 and b1 are not switched on, and the pins a2 and c2 of the connecting piece K11b are switched on, so that the alarm or blocking element 12 is not switched on. That is, when the contact state monitoring control unit 10 detects that the alarm (or latch) contact PJ is in the non-operation state, the contact state monitoring control unit 10 controls the alarm or latch element switching-on unit 11 not to switch on the alarm or latch element 12, so that the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side through the connection K11b (pins a2 and c2 are switched on), the protection unit 9, and the cable line of the original alarm or latch circuit (i.e., the first circuit). Further, the power supply 8 obtains a power supply (voltage V1, for example, 24V) through the rectifying element 19 and the first step-down power supply module 20 (step-down to 24V), and the power supply (voltage V1) can supply power to the valve 4 and the pressure regulating mechanism 5. Meanwhile, the power supply (voltage V1) is reduced through the second voltage reduction power supply module 21 to obtain a power supply with voltage of 5V, the isolated power supply with voltage of 5V is obtained through the isolation function of the isolation power supply module 22, the anti-interference capability is improved, and then power is supplied to the pressure sensor 2, the temperature sensor 3, the on-line check contact signal sampling unit 6 and the intelligent control unit 7 of the gas density monitoring device. The storage capacitor 23 is disposed at the output of the isolated power module 22.

When the alarm (or locking) joint PJ acts, the electric potential at the two ends of the light emitting diode of the optical coupler OC1 is zero, the light emitting diode of the optical coupler OC1 does not emit light, at the moment, the phototriode is not conducted, the control coil 11_XQ of the alarm or locking element switching-on unit 11 is not switched on and is not powered on, the joint K11a of the alarm or locking element switching-on unit 11 is further conducted, namely the pins a1 and b1 are switched on, meanwhile, the pins a2 and c2 of the connecting piece K11b are not switched on, In this way, the power source 8B, the alarm or blocking element 12 (in this case, the intermediate relay ZJ, or the alarm lamp BJD), and the contact K11a of the alarm or blocking element-on unit 11 (i.e. the pins a1 and B1 are turned on) form a loop for conducting the alarm (or blocking) signal, i.e. the second loop, and the intermediate relay ZJ (or the alarm lamp BJD) operates to send out a corresponding alarm signal. unlike the first embodiment, the protection unit 9 in the present embodiment employs a self-restoring fuse (FU 1) 9B to protect the power supply 8 and the alarm (or latch) junction PJ. When the alarm (or locking) junction PJ is closed, the instant connecting piece K11B is still in a conducting state, that is, the pins a2 and c2 are turned on, at this time, the power supply 8 is in a short circuit state due to the closing of the alarm (or locking) junction PJ, the current is large, and when the current exceeds the action current of the self-recovery fuse (FU 1) 9B, the self-recovery fuse (FU 1) 9B is immediately opened, so as to play a role of protecting the power supply 8 and the alarm (or locking) junction PJ. that is, when the contact state monitoring control unit 10 monitors the action state of the alarm (or latch) contact PJ, the contact state monitoring control unit 10 controls the alarm or latch element switching-on unit 11 to switch on the alarm or latch element 12, and sends out a corresponding alarm signal. Although the power supply 8 is not able to supply power to the gas density monitoring device, the storage capacitor 23 is able to continue to supply power to the gas density monitoring device for a period of time. At this time, the leakage of the electrical equipment is alarmed, and workers should go to the site to deal with the problem. During the handling of the gas leakage problem, the storage capacitor 23 can continue to supply power to the gas density monitoring device and can transmit relevant monitoring information and signals during the recovery from the normal state. in this embodiment, the connection piece K11b and the alarm or locking element connection unit 11 are integrated, and may be controlled by the control coil 11_XQ thereof, or may be separate, and may be controlled by the contact state monitoring control unit 10, respectively, in a flexible manner, for example, the alarm or locking element connection unit 11 may be an electromagnetic relay or an intermediate relay, and the connection piece may be a silicon controlled rectifier, that is, may be the same type of device, or may be a different type of device. When the alarm (or blocking) contact PJ is restored to the inactive state, although the pins a2 and c2 of the connector K11b are not turned on, the power supply 8 may supply the operating power to the contact state monitoring control unit 10 through the resistor (Rb 1) 9A, that is, when the alarm (or blocking) contact PJ of the gas density relay 1 is restored to the inactive state, the pressure difference across the alarm or blocking contact PJ of the gas density relay is not zero, the light emitting diode of the photo coupler OC1 emits light, the photo transistor is turned on by the light, and the control coil 11_XQ of the alarm or blocking element turning-on unit 11 is turned on by the power reception, the contact K11a of the alarm or blocking element switching unit 11 is not conductive, i.e. pins a1 and b1 are not switched on, while pins a2 and c2 of the connection K11b are switched on, so that the alarm or blocking element 12 is not switched on. thus, the protection circuit can reliably work, and can recover to be normal and prevent the non-working state.

In the present embodiment, the protection unit 9 employs a self-recovery fuse (FU 1) 9B, and the operation current of FU1 employing the self-recovery fuse is assumed to be 0.8A. When the alarm (or blocking) contact PJ is not operated, the contact K11a of the alarm or blocking element switching unit 11 is not turned on, i.e., the pins a1 and b1 are not turned on, so that the alarm or blocking element 12 is not turned on, and the power supply 8 supplies power to the gas density monitoring device on the gas density relay 1 side through the connection member K11b, the protection unit 9, and the cable of the alarm or blocking circuit (i.e., the first circuit), for example, through a current of 0.6A, and a power supply outputting a power of about 132W (220 v×0.6a=132W) supplies power to the gas density monitoring device, so that the on-line verification operation can be completed.

Fifth embodiment:

Fig. 6 is a schematic diagram of a power supply circuit for a gas density monitoring apparatus according to a fifth embodiment of the present invention. As shown in fig. 6, a power supply for a gas density monitoring device includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a valve 4, a pressure regulating mechanism 5, a temperature regulating mechanism 18, an on-line checking joint signal sampling unit 6, an intelligent control unit 7, a power supply 8, a protection unit 9, a joint state monitoring control unit 10, an alarm or locking element switching-on unit 11, an alarm or locking element 12, an alarm (or locking) joint PJ of the gas density relay 1, a first step-down power supply module 20, a second step-down power supply module 21, an isolation power supply module 22, an energy storage capacitor 23 and an adjusting resistor (R_TJ) 13.

The working principle of this embodiment can be referred to as embodiment one. The difference from the first embodiment is that: 1) The contact state monitoring control unit 10 mainly comprises a resistor R2 (i.e. a second resistor), a resistor R3 (i.e. a third resistor), a triode T1, and a resistor R1 (i.e. a first resistor). 2) The base of the triode T1 is connected to the positive electrode of the alarm (or locking) junction PJ of the gas density relay 1 through a resistor R2, and the base is also connected to the negative electrode of the alarm (or locking) junction PJ through a resistor R3. The collector of the triode T1 is connected to the positive electrode of the alarm (or locking) junction PJ through a resistor R1, the emitter of the triode T1 is connected with one end of a control coil 11_XQ of an alarm or locking element switching-on unit 11, and the other end of a control coil 11_XQ of the alarm or locking element switching-on unit 11 is connected to one end of the negative electrode of the alarm (or locking) junction PJ.

The working principle is as follows: when the junction of the alarm (or locking) junction PJ does not act, the voltage difference between the two ends of the alarm (or locking) junction PJ is not zero, a voltage is divided between the resistor R2 and the resistor R3, the base of the triode T1 has a voltage, the triode T1 is conducted, the control coil 11_XQ of the alarm or locking element switching-on unit 11 is further switched on and is powered on, the junction K11 of the alarm or locking element switching-on unit 11 is not conducted, that is, the pins a1 and b1 are not switched on, so that the second loop is not conducted. That is, when the contact state monitoring control unit 10 monitors that the alarm (or latch) contact PJ is in the non-operation state, the contact state monitoring control unit 10 controls the alarm or latch element switching-on unit 11 such that the adjusting resistor (R_TJ) 13 is connected in series to the loop of the alarm or latch element 12 via the pins a1 and b1 so as not to be conducted. In this way, the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side through the cable line of the alarm or the latch circuit (i.e., the first circuit). Further, the power supply 8 obtains a power supply (voltage V1, for example, 24V) through the first step-down power supply module 20, and the power supply (voltage V1) can supply power to the valve 4, the pressure regulating mechanism 5, and the temperature regulating mechanism 18. Meanwhile, the power supply (voltage V1) is reduced through the second voltage reduction power supply module 21 to obtain a power supply with voltage of 5V, the isolated power supply with voltage of 5V is obtained through the isolation function of the isolation power supply module 22, the anti-interference capability is improved, and then power is supplied to the pressure sensor 2, the temperature sensor 3, the online check contact signal sampling unit 6 and the intelligent control unit 7 of the gas density monitoring device. The storage capacitor 23 is disposed at the output of the isolated power module 22.

When the alarm (or locking) junction PJ acts, the pressure difference between the two ends of the alarm (or locking) junction PJ of the gas density relay is zero, no voltage is divided between the second resistor R2 and the third resistor R3, the base of the triode T1 has no voltage, the triode T1 is not conducted, the control coil 11_XQ of the alarm or locking element switching-on unit 11 is not switched on, no power is received, and the junction K11 of the alarm or locking element switching-on unit 11 is conducted, namely, the pins a1 and b1 of the junction K11 are switched on. Referring to fig. 6, in this way, the power supply 8, the alarm or blocking element 12 (in this case, the intermediate relay ZJ, or the alarm lamp BJD) and the alarm or blocking element switching-on unit 11, the adjusting resistor (R_TJ) 13 are connected to form a loop for conducting an alarm (or blocking) signal, that is, a second loop, and the intermediate relay ZJ (or the alarm lamp BJD) will act to send out a corresponding alarm signal. That is, the alarm or blocking element switching-on unit 11 is controlled by the alarm (or blocking) contact PJ of the gas density relay 1 and the alarm or blocking element switching-on unit 11, and when the contact state monitoring control unit 10 monitors that the alarm (or blocking) contact PJ is in the active state, the contact state monitoring control unit 10 controls the alarm or blocking element switching-on unit 11 to switch on the alarm or blocking element 12, and issues a corresponding alarm or blocking signal.

Example six:

As shown in fig. 7, a power supply for a gas density monitoring device includes: the gas density relay comprises a gas density relay body 1, a power supply 8, a protection unit 9, a contact state monitoring control unit 10, an alarm or locking element connecting unit 11, an alarm or locking element 12, an alarm (or locking) contact PJ of the gas density relay 1, a first step-down power supply module 20, an isolation power supply module 22, an energy storage capacitor C_DR 23, an intelligent control unit 7 of a gas density monitoring device, a pressure sensor 2 and a temperature sensor 3. In this embodiment, the alarm or blocking element switching-on unit 11 adopts an electromagnetic relay, or may adopt an intermediate relay, a magnetic latching relay, or a silicon controlled rectifier; the protection unit 9 adopts a current limiting resistor, and can also adopt a quick self-recovery fuse. The contact state monitoring and controlling unit 10 of the present embodiment mainly comprises a resistor R _{High height} (i.e. a current limiting resistor), an optocoupler OC1 (i.e. a photo coupler) 10A, a resistor R1 (i.e. a first resistor), an intelligent control unit 7, a wireless signal transmitting unit 10B, and a wireless signal receiving unit 10D, MUC control unit 10C. Specifically, the optocoupler OC1 (optocoupler) 10A includes a light emitting diode and a phototransistor, the anode of the light emitting diode is connected to the anode of the alarm (or blocking) junction PJ through a resistor R _{High height}, the cathode of the light emitting diode is connected to the cathode of the alarm (or blocking) junction PJ, the emitter of the phototransistor is grounded, the collector of the phototransistor is connected to the power VCC through a resistor R1, the collector of the phototransistor is further connected to the intelligent control unit 7, the intelligent control unit 7 is connected to the wireless signal transmitting unit 10B, the MUC control unit 10C is connected to the wireless signal receiving unit 10D, and the wireless signal transmitting unit 10B is connected to the wireless signal receiving unit 10D through wireless communication; the resistor R _{High height}, the optocoupler OC1 (optocoupler) 10A, the resistor R1, the intelligent control unit 7, and the wireless signal transmitting unit 10B of the contact state monitoring control unit 10 are disposed on the gas density relay side, and the wireless signal receiving unit 10D, MUC control unit 10C is disposed on the control closet (or control closet) side.

The working principle is as follows: when the alarm (or blocking) junction PJ is in the inactive state, the light emitting diode of the optocoupler OC1 (optocoupler) 10A emits light, the phototransistor is turned on by the light, the emitter of the phototransistor is turned on, the potential of Vout is at a low level, which is monitored by the intelligent control unit 7, when the intelligent control unit 7 monitors that the potential of Vout is at a low level, the intelligent control unit 7 transmits a corresponding first signal (or blocking) information that the junction PJ is in the inactive state through the wireless signal transmitting unit 10B, when the wireless signal receiving unit 10D receives a corresponding first signal (or information that the junction PJ is in the inactive state), which is monitored by the MUC control unit 10C, the MUC control unit 10C controls the alarm or locking element switching unit 11 so that the control coil 11_XQ of the alarm or locking element switching unit 11 is not switched on to receive power, that is, the pins a1 and B1 are not switched on, so that the alarm or locking element 12 is not switched on, that is, when the contact state monitoring control unit 10 detects that the alarm (or locking) contact PJ is in the inactive state, the contact state monitoring control unit 10 controls the alarm or locking element switching unit 11 not to switch on the alarm or locking element 12, so that the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side through the cable of the protection unit 9 and the original alarm (or locking) circuit (i.e., the first circuit). Further, the power supply 8 passes through the first step-down power supply module 20 and the isolation power supply module 22, and then supplies power to the pressure sensor 2 and the temperature sensor 3 of the gas density monitoring device. The storage capacitor 23 is disposed at the output of the isolated power module 22.

When the alarm (or blocking) junction PJ acts, the pressure difference between the two ends of the alarm (or blocking) junction PJ of the gas density relay is zero, the electric potential between the two ends of the light emitting diode is zero, then the light emitting diode of the optocoupler OC1 (optocoupler) 10A does not emit light, at this time, the phototransistor is not conductive, i.e., the emitter of the phototransistor is not conductive, at this time, the electric potential of Vout is at a high level, which is monitored by the intelligent control unit 7, when the intelligent control unit 7 monitors that the electric potential of Vout is at a high level, the intelligent control unit 7 transmits a corresponding second signal (information that the alarm (or blocking) junction PJ is in an active state) through the wireless signal transmitting unit 10B, at this time, the wireless signal receiving unit 10D receives a corresponding second signal (information that the alarm (or blocking) junction PJ is in an active state), which is monitored by the MUC control unit 10C, the MUC control unit 10C controls the alarm or blocking element switching unit 11, the control coil_XQ of the alarm or blocking element switching unit 11 is electrified, and the alarm or blocking element switching unit 11 is further, i.e., the pin 11 a and the pin 1B are switched on. In this way, the power supply 8, the alarm or blocking element 12 (in this case, the intermediate relay ZJ, or the alarm lamp BJD), and the contact K11 of the alarm or blocking element on unit 11 form a loop for the on-state of the alarm (or blocking) signal, i.e. the second loop, and the intermediate relay ZJ (or the alarm lamp BJD) operates to send out a corresponding alarm signal. That is, when the contact state monitoring control unit 10 monitors the action state of the alarm (or latch) contact PJ, the contact state monitoring control unit 10 controls the alarm or latch element switching-on unit 11 to switch on the alarm or latch element 12. At this time, although the power supply 8 cannot supply power to the gas density monitoring device, the energy storage capacitor (C_DR) 23 can continue to supply power to the gas density monitoring device for a while. At this time, the leakage of the electrical equipment is alarmed, and workers should go to the site to deal with the problem. During the handling of the leakage problem, the storage capacitor (C_DR) 23 can continue to supply power to the gas density monitoring device and can transmit relevant monitoring information and signals during the recovery to normal state.

Embodiment seven:

Fig. 8 is a schematic diagram of a power supply circuit for a gas density monitoring apparatus according to a seventh embodiment of the present invention. As shown in fig. 8, a power supply for a gas density monitoring device includes: the gas density relay comprises a gas density relay body 1, a pressure sensor 2, a temperature sensor 3, a contactor 25 (which can be used for controlling an indicator lamp), an online checking contact signal sampling unit 6, an intelligent control unit 7, a power supply 8, a protection unit 9, a contact state monitoring control unit 10, an alarm or locking element switching-on unit 11, an alarm or locking element 12, an alarm (or locking) contact PJ of the gas density relay 1, a first step-down power supply module 20, an isolation power supply module 22 and a regulating resistor (R_TJ) 13.

The working principle of the present embodiment can be referred to embodiment five. The difference from the fifth embodiment is that: 1) The contact state monitoring control unit 10 mainly comprises a voltage stabilizing tube W1 (i.e. a first voltage stabilizing tube), a voltage stabilizing tube W2 (i.e. a second voltage stabilizing tube), a triode T1 and a resistor R1 (i.e. a first resistor). 2) The base electrode of the triode T1 is respectively connected with the positive electrode of the voltage stabilizing tube W1 and the negative electrode of the voltage stabilizing tube W2, the negative electrode of the voltage stabilizing tube W1 is connected with the positive electrode of an alarm (or locking) joint PJ of the gas density relay 1, and the positive electrode of the voltage stabilizing tube W2 is connected with the negative electrode of the alarm (or locking) joint PJ; the collector of the triode T1 is connected to the positive electrode of an alarm (or locking) junction PJ of the gas density relay 1 through a resistor R1, the emitter of the triode T1 is connected with one end of a control coil 11_XQ of an alarm or locking element switching-on unit 11, and the other end of a control coil 11_XQ of the alarm or locking element switching-on unit 11 is connected to one end of the negative electrode of the alarm (or locking) junction PJ.

The working principle is as follows: when the alarm (or locking) joint PJ does not act, the pressure difference between two ends of the alarm (or locking) joint PJ of the gas density relay is not zero, partial pressure exists between the first voltage stabilizing tube W1 and the second voltage stabilizing tube W2, the base electrode of the triode T1 has voltage, the triode T1 is conducted, the control coil 11_XQ of the alarm or locking element connecting unit 11 is further connected to be electrified, the joint K11 of the alarm or locking element connecting unit 11 is not conducted, namely the pins a1 and b1 are not connected, and the regulating resistor (R_TJ) 13 is connected in series with a loop (namely a second loop) of the alarm or locking element 12 through the pins a1 and b 1. That is, when the contact state monitoring control unit 10 monitors that the alarm (or blocking) contact PJ is in the non-operation state, the contact state monitoring control unit 10 controls the alarm or blocking element switching-on unit 11 such that the adjusting resistor (R_TJ) 13 is not switched on in the loop of the alarm or blocking element 12 through the contact K11 (i.e., through the pins a1 and b 1), the alarm or blocking element 12 is not operated, and thus the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side through the cable of the original alarm or blocking loop (i.e., the first loop). Further, the power supply 8 obtains a power supply (voltage is 5 v) through the first step-down power supply module 20, and then obtains the power supply with the voltage of 5v after isolation through the isolation function of the isolation power supply module 22, so that the anti-interference capability is improved, and then power is supplied to the pressure sensor 2, the temperature sensor 3, the on-line check contact signal sampling unit 6 and the intelligent control unit 7 of the gas density monitoring device.

When the alarm (or locking) junction PJ acts, the pressure difference between the two ends of the alarm (or locking) junction PJ of the gas density relay is zero, no voltage is divided between the voltage stabilizing tube W1 and the voltage stabilizing tube W2, the base of the triode T1 has no voltage, the triode T1 is not conducted, the control coil 11_XQ of the alarm or locking element switching unit 11 is not powered, the junction K11 of the alarm or locking element switching unit 11 is conducted, that is, the pins a1 and b1 are switched on, and the regulating resistor (R_TJ) 13 is connected in series with the loop (that is, the second loop) of the alarm or locking element 12 through the pins a1 and b 1. That is, when the contact state monitoring control unit 10 monitors that the alarm (or locking) contact PJ is in the action state, the contact state monitoring control unit 10 controls the alarm or locking element switching-on unit 11, so that the adjusting resistor (R_TJ) 13 is connected in series with the loop of the alarm or locking element 12 through the pins a1 and b1 to be conducted, so that the alarm or locking element 12 receives power, sends out a corresponding alarm signal, indicates that the air leakage occurs, and then the operation and maintenance personnel is required to go to the field to deal with the problem. In this embodiment, the voltage stabilizing tubes W1, W2 may be replaced by other voltage stabilizing devices.

Example eight:

As shown in fig. 9, a power supply for a gas density monitoring device includes: the gas density relay body 1, the power supply 8, the protection unit 9, the contact state monitoring control unit 10, the alarm or blocking element switching-on unit 11, the alarm or blocking element 12, the alarm (or blocking) contact PJ of the gas density relay 1, the rectifying element 19, the step-down power supply module 20, the isolation power supply module 22, and the MCU control unit of the gas density monitoring device. In this embodiment, the alarm or blocking element switching-on unit 11 adopts an electromagnetic relay, or may adopt an intermediate relay, a magnetic latching relay, or a silicon controlled rectifier; the protection unit 9 can adopt a current limiting resistor or a quick self-recovery fuse; the alarm or locking element switching-on unit 11 is powered by the power supply 8 (i.e. the power supply unit a and the power supply unit B are the same ac power supply 8 in this embodiment), specifically, the power supply 8 is rectified by the rectifying element D1 and then powers the resistor R1 (i.e. the first current limiting resistor) and the optocoupler OC 1.

The contact state monitoring control unit 10 mainly comprises an optocoupler OC1, a resistor R1 (namely a first current limiting resistor), a resistor R2 (namely a second current limiting resistor), a resistor R3 (namely a third current limiting resistor), a rectifying element D3, a capacitor C2 and a current transformer Q1, wherein the current transformer Q1 is connected with the alternating current side of the rectifying element D3, the direct current side of the rectifying element D3 is connected with the capacitor C2, the resistor R2 and a photo coupler OC1 through the resistor R3, the resistor R2 and the photo coupler OC1 are connected in series and then connected with the capacitor C2 in parallel, the photo coupler OC1 comprises two light emitting diodes and a phototriode which are connected in inverse parallel, the collector of the phototriode is connected with the resistor R1, and the emitter of the phototriode is connected with the alarm or locking element connection unit 11.

The working principle is as follows: the contact state monitoring control unit 10 of the present embodiment is also a current sampling circuit. When the alarm (or locking) contact PJ is in the non-action state, the current flowing through the current transformer Q1 is small, the light emitting diode of the optocoupler OC1 does not emit light, so that the phototransistor is not turned on, and the control coil 11_XQ of the alarm or locking element switching unit 11 is not turned on to receive power, i.e., the contact K11 of the alarm or locking element switching unit 11 is not turned on, i.e., the pins a1 and b1 are not turned on, so that the alarm or locking element 12 is not turned on, i.e., when the contact state monitoring control unit 10 monitors that the alarm (or locking) contact PJ is in the non-action state, the contact state monitoring control unit 10 controls the alarm or locking element switching unit 11 not to turn on the alarm or locking element 12. In this way, the power supply 8 can supply power to the gas density monitoring device on the gas density relay 1 side via the cable line of the original alarm or lock loop (i.e., the first loop). Further, the power supply 8 is further provided with a rectifying element (D2) 19, a first step-down power module 20 (for example, step down to 24 v), and then an isolated power supply with an isolated voltage (for example, 5 v) is obtained through the isolation action of the isolation power module 22, so as to improve the anti-interference capability, and then power is supplied to the MCU control unit, the pressure sensor, the temperature sensor and the wireless remote communication module of the gas density monitoring device. The first buck power module 20 mainly comprises a buck chip IC1, a voltage regulator W1, an inductor L1, a triode T1, a diode D3, a resistor R5, and a capacitor C1, specifically, the voltage of the resistor R5 is monitored by the buck chip IC1 to control the on or off frequency of the emitter of the triode T1, so that the charge and discharge frequency of the capacitor C1 can be controlled through the inductor L1 and the diode D3, and the output voltage value can be controlled. The embodiment may further be provided with an energy storage capacitor (not shown in the figure), where the energy storage capacitor is disposed at the output end of the isolated power module 22, and after the alarm (or locking) junction PJ acts, the energy storage capacitor can continue to supply power to the gas density monitoring device for a period of time after the power supply of the power supply 8 is lost.

When the alarm (or blocking) contact PJ acts, the current flowing through the current transformer Q1 is large, the light emitting diode of the optocoupler OC1 emits light, at this time, the phototransistor is turned on, the control coil 11_XQ of the alarm or blocking element switching unit 11 is turned on to receive power, so that the contact K11 of the alarm or blocking element switching unit 11 is turned on, i.e., the pins a1 and b1 are turned on, and thus the power supply 8, the alarm or blocking element 12 (in this case, the intermediate relay ZJ, or the alarm lamp BJD), and the contact K11 of the alarm or blocking element switching unit 11 form a loop for conducting an alarm (or blocking) signal, i.e., a second loop, and the intermediate relay ZJ (or the alarm lamp BJD) acts to emit a corresponding alarm signal. In this embodiment, the ac/dc current can be used in common by the rectifying elements D1 and D2.

In this embodiment, the contact state monitoring control unit 10 includes: the photoelectric coupler OC1, the first current limiting resistor R1, the second current limiting resistor R2, the third current limiting resistor R3, the capacitor C2, the rectifying element D3 and the current transformer Q1; the output end of the current transformer Q1 is connected with the alternating current side of the rectifying element D3, the direct current side of the rectifying element D3 is connected with a capacitor C2, a second resistor R2 and a photoelectric coupler OC1 through a third resistor R3, and the second resistor R2 is connected with the photoelectric coupler OC1 in series and then connected with the capacitor C2 in parallel; the photoelectric coupler OC1 comprises a first port, a second port, a third port and a fourth port, two light emitting diodes which are reversely connected in parallel are arranged between the first port and the fourth port of the photoelectric coupler OC1, the cathode of the first light emitting diode is connected with the anode of the second light emitting diode and is used as the first port of the photoelectric coupler OC1, and the anode of the first light emitting diode is connected with the cathode of the second light emitting diode and is used as the fourth port of the photoelectric coupler OC 1; the second port of the photoelectric coupler OC1 is a collector electrode of a phototriode, and the third port of the photoelectric coupler OC1 is an emitter electrode of the phototriode; the first port of the photoelectric coupler OC1 is connected with the second resistor R2, the second port of the photoelectric coupler OC1 is connected with one end of the power supply 8 through the first current limiting resistor R1, the third port of the photoelectric coupler OC1 is connected with the other end of the power supply 8 through the alarm or locking element switching-on unit 11, and the power supply 8 is an ac power supply; when the gas density relay alarm (or locking) joint PJ does not act, the current flowing through the current transformer Q1 is small, two anti-parallel light emitting diodes do not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level; when the alarm (or locking) joint PJ of the gas density relay acts, the current flowing through the current transformer Q1 is large, the two anti-parallel light emitting diodes are conducted, the phototriode is conducted by light, the current in the phototriode flows from the collector to the emitter, the current is provided for the alarm or locking element switching-on unit 11, and the emitter of the phototriode outputs a high level.

Example nine:

As shown in fig. 10, a power supply for a gas density monitoring device includes: the gas density relay comprises a gas density relay body 1, a power supply 8, a protection unit 9, a contact state monitoring control unit 10, an alarm or locking element connecting unit 11, an alarm or locking element 12, an alarm (or locking) contact PJ of the gas density relay 1, a step-down power supply module 20, an isolation power supply module 22 and an MCU control unit of the gas density monitoring device. The alarm or locking element switching-on unit 11 can adopt an electromagnetic relay, an intermediate relay, a magnetic latching relay and a silicon controlled rectifier; the protection unit 9 can adopt a current limiting resistor or a quick self-recovery fuse; the contact state monitoring control unit 10 mainly comprises a resistor R1 (i.e., a first current limiting resistor), a resistor R2 (i.e., a second current limiting resistor), a resistor R'4 (i.e., a fourth current limiting resistor), an optocoupler OC1 (i.e., a photocoupler), a current transformer Q1, an AC-DC converter U1 (i.e., a DC-AC converter), and a rectifying element D1.

In this embodiment, in order to be able to be used in a DC power supply, an AC-DC converter U1 is added, i.e., U1 is a DC-AC converter for converting a DC voltage signal into an AC voltage signal. The ac-dc converter U1 superimposes the ac variation of the ac-dc converter U1 on the current transformer Q1, thereby obtaining the current of the loop in the current transformer Q1. When the alarm (or locking) junction PJ is in a non-action state, the current flowing through the current transformer Q1 is small; when the alarm (or lock) junction PJ is operated, the current flowing through the current transformer Q1 is large.

In this embodiment, as shown in fig. 10, the contact state monitoring control unit 10 includes: the photoelectric coupler OC1, the first current limiting resistor R1, the second current limiting resistor R2, the fourth current limiting resistor R'4, the capacitor C2, the rectifying element D1, the current transformer Q1 and the DC-AC converter U1; the input end of the DC-AC converter U1 is connected with the power supply 8, the output end of the DC-AC converter U1 is connected with the first alternating current input end of the rectifying element D1, the output end of the DC-AC converter U1 is also connected with the second alternating current input end of the rectifying element D1 through a fourth resistor R'4 and a current transformer Q1, the direct current side of the rectifying element D1 is connected with a capacitor C2, a second resistor R2 and a photoelectric coupler OC1, and the second resistor R2 is connected with the photoelectric coupler OC1 in series and then is connected with the capacitor C2 in parallel; the photoelectric coupler OC1 comprises a first port, a second port, a third port and a fourth port, two light emitting diodes which are reversely connected in parallel are arranged between the first port and the fourth port of the photoelectric coupler OC1, the cathode of the first light emitting diode is connected with the anode of the second light emitting diode and is used as the first port of the photoelectric coupler OC1, and the anode of the first light emitting diode is connected with the cathode of the second light emitting diode and is used as the fourth port of the photoelectric coupler OC 1; the second port of the photoelectric coupler OC1 is a collector electrode of a phototriode, and the third port of the photoelectric coupler OC1 is an emitter electrode of the phototriode; the first port of the photo coupler OC1 is connected with the second resistor R2, the second port of the photo coupler OC1 is connected with one end of the power supply 8 through the first current limiting resistor R1, the third port of the photo coupler OC1 is connected with the other end of the power supply 8 through the alarm or locking element switching-on unit 11, and the power supply 8 is a direct current power supply; when the gas density relay alarm (or locking) joint PJ does not act, the current flowing through the current transformer Q1 is small, two anti-parallel light emitting diodes do not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level; when the alarm (or locking) joint PJ of the gas density relay acts, the current flowing through the current transformer Q1 is large, the two anti-parallel light emitting diodes are conducted, the phototriode is conducted by light, the current in the phototriode flows from the collector to the emitter, the current is provided for the alarm or locking element switching-on unit 11, and the emitter of the phototriode outputs a high level. The working principle is similar to that of the eighth embodiment, and reference may be made to the eighth embodiment, which is not described herein. This embodiment is only suitable for use with dc power supplies.

In summary, in the power supply for a gas density monitoring device provided by the present application, the contact state monitoring control unit 10 may be a voltage sampling circuit, and the voltage sampling circuit may further include a plurality of resistors and a silicon controlled rectifier SCR; or the voltage sampling circuit of the contact state monitoring and controlling unit 10 mainly comprises a transformer TV 1; or the contact state monitoring control unit 10 may include a power conversion sampling signal circuit that converts power into a power sampling signal circuit, such as specifically, power into power; or the contact state monitoring and controlling unit 10 is an electric energy conversion sampling signal circuit, for example, an electric energy conversion to thermal energy sampling signal circuit, for example, specifically, the electric energy conversion to thermal energy sampling signal circuit mainly comprises a temperature changing element (in this case, a resistor R) and a temperature detection sensor T_L; For example, the temperature change element can include, but is not limited to, one of a heating element, a cooling element; in addition, the temperature change member and temperature detection sensor T_L can be replaced by any one of, including, but not limited to, a sound generator and a sound detection sensor, a wind generator and a wind detection sensor; or the contact state monitoring control unit 10 may be a voltage or current sampling circuit, specifically, the voltage or current sampling circuit is mainly composed of a resistor R, a voltage or current relay J_DK; Or the contact state monitoring and controlling unit 10 mainly comprises a detection sensing element, a contact connecting wire and a signal conversion circuit; or the contact state monitoring control unit 10 is a voltage or current sampling circuit, specifically, the voltage or current sampling circuit is mainly composed of an LC oscillator; alternatively, the contact state monitoring control unit 10 is a carrier sampling signal circuit, specifically, the carrier sampling signal circuit is mainly composed of a carrier ZB. The transmitting end and the receiving end of the carrier ZB are connected in parallel with the two ends of the alarm (or locking) joint PJ, so that the carrier ZB monitors the joint state by connecting the alarm (or locking) joint PJ of the gas density relay body 10 and the control loop 9 of the density relay body joint 8 in series to form a loop; Or the contact state monitoring and controlling unit 10 is a voltage sampling circuit, and the voltage sampling circuit mainly comprises a capacitor C1 and a capacitor C2; or the contact state monitoring and controlling unit 10 is a voltage sampling circuit, and the voltage sampling circuit mainly comprises a voltage stabilizing tube W1 and a voltage stabilizing tube W2; or the contact state monitoring control unit 10 is an electric energy conversion sampling signal circuit, and the electric energy conversion sampling signal circuit is an electric energy conversion kinetic energy sampling signal circuit. Specifically, the electric energy-to-kinetic energy sampling signal circuit mainly comprises a resistor R _{High height}, a driving part (a motor M is adopted in the present case), an electric control part KG and a controller K1; Or the contact state monitoring control unit 10 is a voltage sampling circuit (or a current sampling circuit), and the voltage sampling circuit mainly comprises a voltage (or current) transducer. The forms can vary and are not described in detail here.

The power supply for the gas density monitoring device, the implementation method thereof and the gas density monitoring device related in the transformation method can be a remote gas density relay with integral components, can also be a gas density relay with integral components, and can also be generally called as a gas density monitoring device. The gas density relay also comprises a micro water sensor, and the micro water sensor is connected with the intelligent control unit and is used for monitoring the micro water value of the gas on line. The gas density relay further comprises a decomposition product sensor for on-line monitoring of gas decomposition products, and the decomposition product sensor is connected with the intelligent control unit. The power supply for supplying power to the first loop and the power supply for supplying power to the second loop can be direct current power supply, alternating current power supply, the same power supply, mutually independent different power supplies and can be flexibly arranged according to actual requirements.

In summary, the present application provides a power supply for a gas density monitoring device, an implementation method and a modification method thereof, where the power supply for a gas density monitoring device includes: the device comprises a contact state monitoring control unit, an alarm or locking element switching-on unit, a power supply unit A, a power supply unit B and a gas density relay alarm or locking contact. When the contact point state monitoring control unit monitors that the gas density relay alarm or locking contact point is in a non-action state, the contact point state monitoring control unit controls the alarm or locking element switching-on unit not to switch on the alarm or locking element, so that a first loop formed by connecting the power supply unit A, the contact point state monitoring control unit and the gas density relay alarm or locking contact point is conducted or normally works, and the power supply unit A supplies power to a gas density monitoring device at the gas density relay side through a cable line of the original alarm or locking loop; when the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, so that a second loop formed by connecting the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit is conducted, and the power supply unit B supplies power to the alarm or locking element to enable the alarm or locking element to send out corresponding alarm or locking signals. The power supply for the gas density monitoring device is used for modifying the existing alarming or locking cable, so that the existing alarming or locking function can be realized, the gas density monitoring device at the gas density relay side can be conveniently powered, the gas density monitoring device is not required to be powered and rewiring is not required, and the technical scheme of the application can be applied to newly-built substations. The technical scheme of the application can reduce the cable and construction cost, save the construction cost, improve the construction and installation efficiency and accelerate the popularization of intelligent monitoring of the gas density. The application relates to a power supply for a gas density monitoring device, which can also be called a power supply module for the gas density monitoring device, or provides a convenient power supply solution for the gas density monitoring device. To specific product (component) solutions, methods of implementation, and methods of retrofitting in substations.

The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.

Claims (20)

1. The power supply for the gas density monitoring device is characterized by comprising: the contact state monitoring control unit, the alarm or locking element connecting unit, the alarm or locking element, the power supply unit A, the power supply unit B and the gas density relay alarm or locking contact; wherein,

The power supply unit A, the contact state monitoring control unit and the gas density relay alarm or locking contact are connected to form a first loop;

the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit are connected to form a second loop;

the alarm or locking element is connected with a unit in series with the alarm or locking element in the second loop;

The contact state monitoring control unit is arranged on the side of the control cabinet and/or the side of the gas density relay and is respectively connected with the alarm or locking contact of the gas density relay and the alarm or locking element connection unit, the contact state monitoring control unit comprises a contact state monitoring element and a control element, the contact state monitoring element is configured to monitor the contact state of the alarm or locking contact of the gas density relay, and the control element is configured to control the on-off of the alarm or locking element connection unit according to the contact state; the junction state monitoring element and the control element are arranged on the side of the control cabinet; or the contact state monitoring element is arranged on the gas density relay side, the control element is arranged on the control cabinet side, and the contact state monitoring element is connected with the control element in a wireless communication mode;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in a non-action state, the contact state monitoring control unit controls the alarm or locking element connection unit not to connect the alarm or locking element, namely, the second loop is disconnected, so that the power supply unit A supplies power to the gas density monitoring device at the gas density relay side through a cable line of the first loop; when the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, namely the second loop is conducted, so that the power supply unit B supplies power to the alarm or locking element through a cable line of the second loop.

2. The power supply for a gas density monitoring device according to claim 1, wherein the contact state monitoring element includes an optocoupler, or an optocoupler and a resistor; or alternatively

The contact state monitoring element comprises a current sensor and/or a voltage sensor and/or a current detector and/or a voltage detector; or alternatively

The contact state monitoring element comprises a self-recovery fuse, or a self-recovery fuse and a silicon controlled rectifier, or a self-recovery fuse and a triode; or alternatively

The contact state monitoring element comprises a current transformer and/or a voltage transformer; or alternatively

The contact state monitoring element comprises a silicon controlled rectifier, a resistor, and/or a MOS field effect transistor, and/or a triode, and/or a diode; or alternatively

The contact state monitoring element comprises an electromagnetic relay and/or an electronic relay; or alternatively

The contact state monitoring element comprises one of a resistor, a heating element, a fan, a light emitting diode, a photoelectric device, a loudspeaker, a motor, an electromagnet, an electric relay and a micro fan; or alternatively

The contact state monitoring element comprises one of an electric contact, an optocoupler, a silicon controlled rectifier, a relay, a MOS field effect transistor, a triode, a diode, a MOS FET relay, a solid state relay, a time relay, a power relay, a current sensor, a current transformer, a voltage sensor, a voltage transformer, a current detector, a voltage detector, a resistor and a self-recovery fuse.

3. The power supply for a gas density monitoring apparatus according to claim 1, wherein the control element includes an optocoupler, or an optocoupler and a resistor; or alternatively

The control element comprises a silicon controlled rectifier, a resistor, and/or a MOS field effect transistor, and/or a triode, and/or a diode; or alternatively

The control element comprises an electromagnetic relay, and/or an electronic relay; or alternatively

The control element comprises a microprocessor and a control relay; or alternatively

The control element comprises one of a resistor, a photoelectric device and an electric relay; or alternatively

The control element comprises one of an electric contact, an optocoupler, a silicon controlled rectifier, a MOS field effect transistor, a triode, a diode, a MOS FET relay, a solid-state relay, a time relay, a power relay, a resistor, a microprocessor and an integrated chip.

4. The power supply for a gas density monitoring device according to claim 1, wherein the contact state monitoring element includes any one of a voltage sampling circuit, a current sampling circuit, an electric energy conversion sampling signal circuit, and a carrier sampling signal circuit; wherein,

The voltage sampling circuit or the voltage sampling circuit comprises one of a resistor, a transformer, a voltage transmitter, a voltage transformer, a capacitor, an LC oscillating circuit, a voltage stabilizer, a discharge tube, a diode, a triode, a silicon controlled rectifier, an optocoupler and a self-recovery fuse;

the current sampling circuit or the current sampling circuit comprises one of a Hall current transformer, a current transducer and a self-recovery fuse;

The electric energy conversion sampling signal circuit comprises one of an electric energy conversion to heat energy sampling signal circuit, an electric energy conversion to light energy sampling signal circuit, an electric energy conversion to sound energy sampling signal circuit, an electric energy conversion to kinetic energy sampling signal circuit and an electric energy conversion to wind energy sampling signal circuit; the electric energy conversion sampling signal circuit comprises one of a resistor, a capacitor, a heating element, a fan, a light emitting diode, a photoelectric device, a loudspeaker, a motor, an electromagnet, an electric relay and a micro fan.

5. The power supply for a gas density monitoring apparatus according to claim 1, wherein the contact state monitoring control unit is selected from at least one of the following a) -I):

A) The contact state monitoring control unit includes: the photoelectric coupler, the first resistor, the current limiting resistor, at least one diode and the power supply VCC; the photoelectric coupler comprises a light emitting diode and a phototriode, wherein the anode of the light emitting diode is connected with the anode of an alarm or locking contact of the gas density relay through a current limiting resistor, the cathode of the light emitting diode is connected with the cathode of the alarm or locking contact of the gas density relay, at least one diode is connected in forward parallel at two ends of the light emitting diode, the collector of the phototriode is connected with a power supply VCC through a first resistor, and the emitter of the phototriode is grounded through a connection unit of the alarm or locking element; when the alarm or locking contact of the gas density relay does not act, the pressure difference of two ends of the alarm or locking contact of the gas density relay is not zero, the light-emitting diode of the photoelectric coupler emits light to conduct the phototriode, current in the phototriode flows to the emitting electrode from the collecting electrode to provide current for the alarm or locking element connection unit, and the emitting electrode of the phototriode outputs high level; when the gas density relay alarms or the locking contact acts, the pressure difference at two ends of the gas density relay alarms or the locking contact is zero, the light emitting diode of the photoelectric coupler does not emit light, the phototriode is cut off, and the emitter of the phototriode outputs low level;

B) The contact state monitoring control unit includes: the device comprises a Hall current sensor, a first resistor, a second resistor and a microprocessor; one end of the primary side of the Hall current sensor is connected to one end of the power supply unit A, the other end of the primary side of the Hall current sensor is connected with one end of the gas density relay alarm or locking contact, the secondary side of the Hall current sensor is connected with a first resistor and a second resistor in series, the connection part of the first resistor and the second resistor is connected with the microprocessor, the microprocessor is connected with the alarm or locking element connection unit, and the other end of the second resistor is grounded; when the alarm or locking contact of the gas density relay does not act, tiny currents flow through the primary side and the secondary side of the Hall current sensor, the voltage at two ends of the second resistor is lower than a preset voltage, and the microprocessor controls the alarm or locking element to be connected with a unit and not to be connected; when the alarm or locking contact of the gas density relay acts, large current flows through the primary side and the secondary side of the Hall current sensor, the voltage at two ends of the second resistor is more than a preset voltage, and the microprocessor controls the alarm or locking element to be connected with the unit;

c) The contact state monitoring control unit includes: a self-restoring fuse, a thyristor, and a resistor; the controllable silicon comprises a control end, an input end and an output end, wherein the public end of the input end of the controllable silicon and the input end of the self-recovery fuse is connected with the positive electrode of the power supply unit A, the output end of the controllable silicon is connected with the negative electrode of the power supply unit A through the alarm or locking element connection unit, the control end of the controllable silicon is connected with the output end of the self-recovery fuse through a resistor, and the output end of the self-recovery fuse is also connected with the positive electrode of the alarm or locking contact of the gas density relay through the alarm or locking element connection unit; when the gas density relay alarms or the locking contact does not act, the voltage of the control end of the silicon controlled rectifier is equal to the voltage of the input end, and the silicon controlled rectifier is cut off; when the gas density relay alarms or the locking contact acts, the current flowing through the self-recovery fuse exceeds the rated current of the gas density relay, the self-recovery fuse is disconnected, the voltage on the control end of the silicon controlled rectifier reaches the trigger voltage of the silicon controlled rectifier, and the silicon controlled rectifier is conducted and forms a loop with the power supply unit A and the alarm or locking element connection unit;

D) The contact state monitoring control unit includes: the photoelectric coupler, the first resistor and the current limiting resistor; the photoelectric coupler comprises a light emitting diode and a phototriode, wherein the anode of the light emitting diode is connected with the anode of an alarm or locking contact of the gas density relay through a current limiting resistor, the cathode of the light emitting diode is connected with the cathode of the alarm or locking contact of the gas density relay, the collector of the phototriode is connected with the anode of the power supply unit B through a first resistor, and the emitter of the phototriode is connected with the cathode of the power supply unit B through an alarm or locking element; when the alarm or locking contact of the gas density relay does not act, the pressure difference of two ends of the alarm or locking contact of the gas density relay is not zero, the light-emitting diode of the photoelectric coupler emits light to conduct the phototriode, current in the phototriode flows to the emitting electrode from the collecting electrode to provide current for the alarm or locking element connection unit, and the emitting electrode of the phototriode outputs high level; when the gas density relay alarms or the locking contact acts, the pressure difference at two ends of the gas density relay alarms or the locking contact is zero, the light emitting diode of the photoelectric coupler does not emit light, the phototriode is cut off, and the emitter of the phototriode outputs low level;

E) The contact state monitoring control unit includes: the first resistor, the second resistor, the third resistor and the triode; the collector of the triode is connected with the positive electrode of the alarm or locking contact of the gas density relay through a first resistor, and the emitter of the triode is connected with the negative electrode of the alarm or locking contact of the gas density relay through the alarm or locking element connecting unit; the base electrode of the triode is connected with the positive electrode of the gas density relay alarming or locking contact through a second resistor, and the base electrode of the triode is also connected with the negative electrode of the gas density relay alarming or locking contact through a third resistor; when the gas density relay alarm or locking contact does not act, the pressure difference of two ends of the gas density relay alarm or locking contact is not zero, partial pressure exists between the second resistor and the third resistor, the triode is conducted, and the emitting electrode of the triode outputs high level; when the gas density relay alarms or the locking contact acts, the pressure difference at two ends of the gas density relay alarms or the locking contact is zero, no partial pressure exists between the second resistor and the third resistor, the triode is cut off, and the emitting electrode of the triode outputs low level;

F) The contact state monitoring control unit includes: the system comprises a first resistor, a current limiting resistor, a photoelectric coupler, an intelligent control unit, a wireless signal transmitting unit, a wireless signal receiving unit and a MUC control unit, wherein the first resistor, the current limiting resistor, the photoelectric coupler, the intelligent control unit and the wireless signal transmitting unit are arranged on the gas density relay side; the photoelectric coupler comprises a light emitting diode and a phototriode, wherein the anode of the light emitting diode is connected with the anode of an alarm or locking contact of the gas density relay through a current limiting resistor, the cathode of the light emitting diode is connected with the cathode of the alarm or locking contact of the gas density relay, the emitter of the phototriode is grounded, the collector of the phototriode is connected with a power supply VCC through a first resistor, the collector of the phototriode is also connected with the intelligent control unit, and the intelligent control unit is connected with the wireless signal transmitting unit; the MUC control unit is connected with the wireless signal receiving unit; the wireless signal transmitting unit is in wireless communication connection with the wireless signal receiving unit; when the gas density relay alarm or locking contact does not act, the pressure difference between two ends of the gas density relay alarm or locking contact is not zero, the light emitting diode of the photoelectric coupler emits light, the light turns on the phototriode, the collector of the phototriode outputs a low level to the intelligent control unit, the intelligent control unit sends a first signal outwards through the wireless signal transmitting unit, the wireless signal receiving unit receives the first signal in a wireless transmission mode and sends the first signal to the MUC control unit, and the MUC control unit controls the alarm or locking element to be turned on; when the gas density relay alarm or locking contact acts, the pressure difference at two ends of the gas density relay alarm or locking contact is zero, the light emitting diode of the photoelectric coupler does not emit light, the phototriode is cut off, the collector electrode of the phototriode outputs a high level to the intelligent control unit, the intelligent control unit sends out a second signal through the wireless signal transmitting unit, the wireless signal receiving unit receives the second signal in a wireless transmission mode and sends the second signal to the MUC control unit, and the MUC control unit controls the alarm or locking element to be connected with the unit;

G) The contact state monitoring control unit includes: the first voltage stabilizing tube, the second voltage stabilizing tube, the triode and the first resistor; the collector of the triode is connected with the positive electrode of the alarm or locking contact of the gas density relay through a first resistor, and the emitter of the triode is connected with the negative electrode of the alarm or locking contact of the gas density relay through the alarm or locking element connecting unit; the base electrode of the triode is respectively connected with the positive electrode of the first voltage stabilizing tube and the negative electrode of the second voltage stabilizing tube, the negative electrode of the first voltage stabilizing tube is connected with the positive electrode of the gas density relay alarming or locking contact, and the positive electrode of the second voltage stabilizing tube is connected with the negative electrode of the gas density relay alarming or locking contact; when the gas density relay alarm or locking contact does not act, the pressure difference of two ends of the gas density relay alarm or locking contact is not zero, partial pressure exists between the first voltage stabilizing tube and the second voltage stabilizing tube, the triode is conducted, and the emitting electrode of the triode outputs high level; when the gas density relay alarms or the locking contact acts, the pressure difference at two ends of the gas density relay alarms or the locking contact is zero, no partial pressure exists between the first voltage stabilizing tube and the second voltage stabilizing tube, the triode is cut off, and the emitting electrode of the triode outputs low level;

H) The contact state monitoring control unit includes: the device comprises an optoelectronic coupler, a first current-limiting resistor, a second current-limiting resistor, a third current-limiting resistor, a capacitor, a rectifying element and a current transformer; the output end of the current transformer is connected with the alternating current side of the rectifying element, the direct current side of the rectifying element is connected with the capacitor, the second resistor and the photoelectric coupler through the third resistor, and the second resistor is connected with the photoelectric coupler in series and then connected with the capacitor in parallel; the photoelectric coupler comprises a first port, a second port, a third port and a fourth port, wherein two light emitting diodes which are connected in parallel in opposite directions are arranged between the first port and the fourth port of the photoelectric coupler, the light emitting diodes are respectively a first light emitting diode and a second light emitting diode, the cathode of the first light emitting diode is connected with the anode of the second light emitting diode and is used as the first port of the photoelectric coupler, and the anode of the first light emitting diode is connected with the cathode of the second light emitting diode and is used as the fourth port of the photoelectric coupler; the second port of the photoelectric coupler is a collector electrode of a phototriode, and the third port of the photoelectric coupler is an emitter electrode of the phototriode; the first port of the photoelectric coupler is connected with the second resistor, the second port of the photoelectric coupler is connected with one end of the power supply unit A through the first current limiting resistor, the third port of the photoelectric coupler is connected with the other end of the power supply unit A through the alarm or locking element connecting unit, and the power supply unit A is an alternating current power supply; when the gas density relay alarms or the locking contact does not act, the current flowing through the current transformer is small, the two anti-parallel light emitting diodes do not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level; when the alarm or locking contact of the gas density relay acts, the current flowing through the current transformer is large, the two anti-parallel light emitting diodes are conducted, the phototriode is conducted by light, the current in the phototriode flows from the collector to the emitter, the current is provided for the alarm or locking element switching-on unit, and the emitter of the phototriode outputs high level;

I) The contact state monitoring control unit includes: the device comprises an optoelectronic coupler, a first current-limiting resistor, a second current-limiting resistor, a fourth current-limiting resistor, a capacitor, a rectifying element, a current transformer and a DC-AC converter; the input end of the DC-AC converter is connected with the power supply unit A, the output end of the DC-AC converter is connected with the first alternating current input end of the rectifying element, the output end of the DC-AC converter is also connected with the second alternating current input end of the rectifying element through a fourth resistor and a current transformer, the direct current side of the rectifying element is connected with a capacitor, a second resistor and a photoelectric coupler, and the second resistor is connected with the photoelectric coupler in series and then connected with the capacitor in parallel; the photoelectric coupler comprises a first port, a second port, a third port and a fourth port, wherein two light emitting diodes which are connected in parallel in opposite directions are arranged between the first port and the fourth port of the photoelectric coupler, the light emitting diodes are respectively a first light emitting diode and a second light emitting diode, the cathode of the first light emitting diode is connected with the anode of the second light emitting diode and is used as the first port of the photoelectric coupler, and the anode of the first light emitting diode is connected with the cathode of the second light emitting diode and is used as the fourth port of the photoelectric coupler; the second port of the photoelectric coupler is a collector electrode of a phototriode, and the third port of the photoelectric coupler is an emitter electrode of the phototriode; the first port of the photoelectric coupler is connected with the second resistor, the second port of the photoelectric coupler is connected with one end of the power supply unit A through the first current limiting resistor, the third port of the photoelectric coupler is connected with the other end of the power supply unit A through the alarm or locking element connecting unit, and the power supply unit A is a direct current power supply; when the gas density relay alarms or the locking contact does not act, the current flowing through the current transformer is small, the two anti-parallel light emitting diodes do not emit light, the phototriode is cut off, and the emitter of the phototriode outputs a low level; when the alarm or locking contact of the gas density relay acts, the current flowing through the current transformer is large, the two anti-parallel light emitting diodes are conducted, the phototriode is conducted by light, the current in the phototriode flows from the collector to the emitter, the current is provided for the alarm or locking element switching-on unit, and the emitter of the phototriode outputs high level.

6. The power supply for a gas density monitoring device according to claim 1, wherein the alarm or lock element switching unit includes one of an electric contact, an optocoupler, a thyristor, a MOS field effect transistor, a triode, a MOS FET relay, an electromagnetic relay, a solid state relay, a time relay, a power relay, and a magnetic latching relay.

7. The power supply for a gas density monitoring apparatus according to claim 1, wherein the power supply unit a and the power supply unit B are the same power supply or are different power supplies independent of each other.

8. The power supply for a gas density monitoring apparatus according to claim 1, wherein the power supply unit a includes a direct current power supply and/or an alternating current power supply, and the power supply unit B includes a direct current power supply and/or an alternating current power supply.

9. The power supply for a gas density monitoring apparatus according to claim 1, further comprising a protection unit provided in the first circuit, configured to prevent the power supply unit a from being short-circuited, or to protect a gas density relay alarm or latch contact from being damaged by an excessive current flowing therethrough; the protection unit comprises one of a current limiting resistor, a self-recovery fuse, a voltage stabilizing tube and a silicon controlled rectifier.

10. The power supply for a gas density monitoring device according to claim 1, further comprising at least one step-down power supply module, and/or an isolation power supply module, connected between the power supply unit a and the gas density monitoring device; the step-down power supply module is configured to reduce the voltage output by the power supply unit A to a preset voltage required by the gas density monitoring device; the isolation power supply module is configured to isolate the voltage output by the power supply unit A, and prevent the power supply unit A from interfering with the gas density monitoring device.

11. The power supply for a gas density monitoring device according to claim 10, further comprising an energy storage capacitor provided on a gas density relay side, and the energy storage capacitor is provided on the step-down power supply module and/or the isolation power supply module.

12. The power supply for a gas density monitoring device according to claim 1, further comprising a regulating resistor connected in series with the alarm or lock element switching unit in the second circuit.

13. The power supply for a gas density monitoring device according to claim 1, wherein the gas density monitoring device comprises one of a bimetal-compensated remote gas density relay, a gas-compensated remote gas density relay, a bimetal-and gas-compensated mixed remote gas density relay, a mechanical remote gas density relay, a digital remote gas density relay, a mechanical and digital combined remote gas density relay, a remote gas density relay with pointer display, a digital remote gas density relay, a remote gas density switch without display or indication, an SF6 remote gas density relay, an SF6 mixed gas remote density relay, an N2 gas remote density relay, a self-diagnostic gas density monitoring device, and a self-verification gas density monitoring device.

14. The power supply for a gas density monitoring device according to claim 1, wherein the gas density monitoring device comprises a gas density detection sensor and a smart control unit, and the gas density detection sensor is connected with the smart control unit; or alternatively

The gas density monitoring device comprises a gas density relay body, a gas density detection sensor and an intelligent control unit; the gas density relay body is provided with an alarm and locking contact and is used for monitoring the gas density of the electrical equipment; the gas density detection sensor is communicated with the gas density relay body on a gas path; the intelligent control unit is connected with the gas density detection sensor; or alternatively

The gas density monitoring device comprises an online checking unit, wherein the online checking unit comprises a gas density detection sensor, a pressure regulating mechanism, a valve and an online checking joint signal sampling unit; the gas circuit of the pressure regulating mechanism is communicated with the gas density relay body, and the pressure regulating mechanism is configured to regulate the pressure rise and fall of the gas density relay body so as to enable the gas density relay body to generate contact signal action; the gas density detection sensor is communicated with the gas density relay body on a gas path; the on-line checking contact signal sampling unit is directly or indirectly connected with the gas density relay body and is configured to sample a contact signal of the gas density relay body; one end of the valve is provided with an air inlet communicated with electrical equipment, the other end of the valve is communicated with an air passage of the gas density relay body, or the other end of the valve is connected with the air passage of the pressure regulating mechanism, so that the valve is communicated with the air passage of the gas density relay body; the intelligent control unit is respectively connected with the pressure regulating mechanism, the gas density detection sensor and the on-line check joint signal sampling unit to complete the control of the pressure regulating mechanism, the pressure value acquisition and the temperature value acquisition and/or the gas density value acquisition and detect the joint signal action value and/or the joint signal return value of the gas density relay body; or alternatively

The gas density monitoring device comprises a density monitoring device with a self-diagnosis function;

Wherein the gas density detection sensor comprises at least one pressure sensor and at least one temperature sensor; or the gas density detection sensor is a gas density transmitter consisting of a pressure sensor and a temperature sensor; or the gas density detection sensor is a density detection sensor adopting quartz tuning fork technology.

15. The power supply for a gas density monitoring device according to claim 14, wherein the gas density monitoring device further comprises a communication module for remotely transmitting test data and/or verification results, and the communication mode of the communication module is a wireless communication mode or a wired communication mode.

16. A method of implementing a power supply for a gas density monitoring apparatus as defined in claim 1, comprising:

The alarm or locking element connecting unit is arranged on the side of the control cabinet or the gas density relay, and is connected with the alarm or locking element in series, so that the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit are connected to form a second loop;

the contact state monitoring control unit is arranged at the side of the control converging cabinet and/or the side of the gas density relay, and is connected with the gas density relay alarming or locking contact, so that the power supply unit A, the contact state monitoring control unit and the gas density relay alarming or locking contact are connected to form a first loop; simultaneously, the contact state monitoring control unit is connected with the alarm or locking element connecting unit; the contact state monitoring control unit monitors the contact state of the gas density relay alarm or locking contact and controls the on-off of the alarm or locking element switching-on unit according to the contact state;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in a non-action state, the contact state monitoring control unit controls the alarm or locking element connection unit not to connect the alarm or locking element, namely, the second loop is disconnected, so that the power supply unit A supplies power to the gas density monitoring device at the gas density relay side through a cable line of the first loop;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, namely the second loop is conducted, so that the power supply unit B supplies power to the alarm or locking element through a cable line of the second loop.

17. The method according to claim 16, further comprising a protection unit disposed in the first circuit and configured to prevent the power supply unit a from being short-circuited, or to protect a gas density relay alarm or latch contact from being damaged by an excessive current flowing therethrough; the protection unit comprises one of a current limiting resistor, a self-recovery fuse, a voltage stabilizing tube and a silicon controlled rectifier.

18. The method for realizing a power supply for a gas density monitoring device according to claim 16, wherein the power supply for a gas density monitoring device further comprises at least one step-down power supply module and/or an isolation power supply module, and the step-down power supply module and/or the isolation power supply module are connected between the power supply unit a and the gas density monitoring device; the step-down power supply module reduces the voltage output by the power supply unit A to a preset voltage required by the gas density monitoring device; the isolation power supply module isolates the voltage output by the power supply unit A, and prevents the power supply unit A from interfering the gas density monitoring device.

19. The method according to claim 18, wherein the power supply for a gas density monitoring device further comprises an energy storage capacitor, the energy storage capacitor is arranged on a gas density relay side, and the energy storage capacitor is arranged on the step-down power supply module and/or the isolation power supply module;

When the contact state monitoring control unit monitors that the gas density relay alarms or the locking contact is in an action state, the energy storage capacitor supplies power to the gas density monitoring device.

20. A method of retrofitting a power supply for a gas density monitoring apparatus according to claim 1 and comprising:

Providing a contact state monitoring control unit and an alarm or locking element switching-on unit;

The alarm or locking element connecting unit is arranged on the side of the control cabinet or the gas density relay, and is connected with the alarm or locking element in series, so that the power supply unit B, the alarm or locking element and the alarm or locking element connecting unit are connected to form a second loop;

the method comprises the steps that a contact state monitoring control unit is arranged on a control cabinet side and/or a gas density relay side, the contact state monitoring control unit is connected with an alarm or locking contact of the gas density relay, a first loop is formed by connecting a power supply unit A, the contact state monitoring control unit and the alarm or locking contact of the gas density relay, meanwhile, the contact state monitoring control unit is connected with an alarm or locking element connection unit, the contact state monitoring control unit monitors the contact state of the alarm or locking contact of the gas density relay, and the on-off of the alarm or locking element connection unit is controlled according to the contact state;

Such that:

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in a non-action state, the contact state monitoring control unit controls the alarm or locking element connection unit not to connect the alarm or locking element, namely, the second loop is disconnected, so that the power supply unit A supplies power to the gas density monitoring device at the gas density relay side through a cable line of the first loop;

When the contact state monitoring control unit monitors that the gas density relay alarm or locking contact is in an action state, the contact state monitoring control unit controls the alarm or locking element connecting unit to connect the alarm or locking element, namely the second loop is conducted, so that the power supply unit B supplies power to the alarm or locking element through a cable line of the second loop.