CN112003236A - Overvoltage and overcurrent protection system for electric energy meter - Google Patents
Overvoltage and overcurrent protection system for electric energy meterDownload PDFInfo
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- CN112003236A CN112003236ACN202010885747.5ACN202010885747ACN112003236ACN 112003236 ACN112003236 ACN 112003236ACN 202010885747 ACN202010885747 ACN 202010885747ACN 112003236 ACN112003236 ACN 112003236A
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- 238000007781pre-processingMethods0.000claimsabstractdescription32
- 238000006243chemical reactionMethods0.000claimsabstractdescription14
- 238000007493shaping processMethods0.000claimsdescription18
- 230000003321amplificationEffects0.000claimsdescription16
- 238000003199nucleic acid amplification methodMethods0.000claimsdescription16
- 238000009825accumulationMethods0.000claimsdescription5
- HPDFFVBPXCTEDN-UHFFFAOYSA-Ncopper manganeseChemical group[Mn].[Cu]HPDFFVBPXCTEDN-UHFFFAOYSA-N0.000claimsdescription2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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Abstract
Description
Technical Field
The invention relates to an electric energy meter overvoltage and overcurrent protection system.
Background
An energy meter is an instrument for measuring electric energy, and is also called as a watt-hour meter. At present, overvoltage and overcurrent in an electric energy meter used in China only have the functions of event recording and event alarming, electricity on a user side cannot be disconnected after an event or alarm is generated, and the safety electricity utilization protection effect is not achieved.
Disclosure of Invention
The invention provides an electric energy meter overvoltage and overcurrent protection system, which adopts the following technical scheme:
an electric energy meter overvoltage and overcurrent protection system, comprising: the circuit breaker comprises a current divider, a voltage acquisition module, a first preprocessing module, a current acquisition module, a signal conversion module, a second preprocessing module, a first judgment module, a second judgment module and a circuit breaking protection module;
the voltage acquisition module is used for acquiring a voltage signal of the current divider;
the first preprocessing module preprocesses the voltage signal acquired by the voltage acquisition module to obtain a first comparison voltage;
the current acquisition module is used for acquiring a current signal of the current divider;
the signal conversion module is used for converting the current signal acquired by the current acquisition module into a voltage signal;
the second preprocessing module is used for preprocessing the voltage signal converted by the signal conversion module to obtain a second comparison voltage;
the first judgment module is used for comparing the first comparison voltage with a preset first voltage value and sending a first open circuit signal to the open circuit protection module when the first comparison voltage is greater than the first voltage value;
the second judgment module is used for comparing the second comparison voltage with a preset second voltage value and sending a second open circuit signal to the open circuit protection module when the second comparison voltage is greater than the second voltage value;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the first open circuit signal or the second open circuit signal.
Further, the electric energy meter overvoltage and overcurrent protection system further comprises: the single chip microcomputer module and the display module;
when the first comparison voltage is larger than the first voltage value, the first judgment module also sends a first display control signal to the single chip microcomputer module, the single chip microcomputer module sends the first display signal to the display module after receiving the first display control signal, and the display module displays the voltage overload protection information;
when the second comparison voltage is larger than the second voltage value, the second judgment module further sends a second display control signal to the single chip microcomputer module, the single chip microcomputer module receives the second display control signal and then sends the second display signal to the display module, and the display module displays the current overload protection information.
Furthermore, the electric energy meter overvoltage and overcurrent protection system also comprises a control module for user operation;
the control module is used for receiving the operation of a user and sending a power-on control signal to the singlechip module;
the single chip module sends a power-on signal to the open circuit protection module and sends a clearing signal to the display module after receiving the power-on control signal;
the circuit breaking protection module recovers a power supply circuit supplying power to the outside after receiving the power-on signal;
and the display module stops displaying the voltage overload protection information or the current overload protection information after receiving the clearing signal.
Further, the first judging module is a first comparator;
the second judging module is a second comparator;
the first preprocessing module sends the preprocessed first comparison voltage to the first comparator, and when the first comparison voltage is larger than a first voltage value, the first comparator outputs a high-frequency signal to the open-circuit protection module;
the second preprocessing module sends the preprocessed second comparison voltage to the second comparator, and when the second comparison voltage is larger than a second voltage value, the second comparator outputs a high-frequency signal to the circuit breaking protection module.
Further, the disconnection protection module comprises a pulse generator and a relay;
when the first comparison voltage is larger than the first voltage value, the first comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off;
when the second comparison voltage is larger than the second voltage value, when the second comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off.
Furthermore, the electric energy meter overvoltage and overcurrent protection system also comprises a third judgment module and a fourth judgment module;
the third judging module is used for judging whether the first comparison voltage is between a preset third voltage value and the first voltage value or not and sending a third open circuit signal to the open circuit protection module when the time that the first comparison voltage is continuously between the third voltage value and the first voltage value reaches a first preset time, wherein the third voltage value is smaller than the first voltage value;
the fourth judging module is used for judging whether the second comparison voltage is between a preset fourth voltage value and the second voltage value or not and sending a fourth open circuit signal to the open circuit protection module when the time that the second comparison voltage is continuously between the fourth voltage value and the second voltage value reaches the first preset time;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the third open circuit signal or the fourth open circuit signal.
Furthermore, the electric energy meter overvoltage and overcurrent protection system also comprises a third judgment module and a fourth judgment module;
the third judging module is used for judging whether the first comparison voltage is between a preset third voltage value and the first voltage value, and in a second preset time, when the time accumulation of the first comparison voltage between the third voltage value and the first voltage value reaches the first preset time, the third judging module sends a third open circuit signal to the open circuit protection module, wherein the third voltage value is smaller than the first voltage value, and the second preset time is longer than the first preset time;
the fourth judging module is used for judging whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and in a second preset time, when the time accumulation of the second comparison voltage between the fourth voltage value and the second voltage value reaches a first preset time, the fourth judging module sends a fourth open-circuit signal to the open-circuit protection module, and the fourth voltage value is smaller than the second voltage value;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the third open circuit signal or the fourth open circuit signal.
Further, the first preset time is half of the second preset time.
Further, the first preprocessing module comprises a first signal amplifying submodule and a first shaping submodule;
the second preprocessing module comprises a second signal amplification sub-module and a second shaping sub-module;
the first signal amplification submodule is used for amplifying the voltage signal acquired by the voltage acquisition module;
the first shaping submodule is used for shaping the voltage signal amplified by the first signal amplification submodule to obtain a first comparison voltage;
the second signal amplification submodule is used for amplifying the voltage signal converted by the signal conversion module;
the second shaping submodule is used for shaping the voltage signal amplified by the second signal amplification submodule to obtain a second comparison voltage.
Further, the shunt is a manganin shunt.
The overvoltage and overcurrent protection system has the advantages that the overvoltage and overcurrent protection system for the electric energy meter monitors the working voltage and the working current of the electric energy meter, and cuts off a power supply line supplying power to the outside when one of the working voltage and the working current exceeds a threshold value, so that the power utilization safety is ensured.
The overvoltage and overcurrent protection system for the electric energy meter has the advantages that when the working current or the working voltage of the electric energy meter is in a preset higher range for a long time, the system can also cut off a power supply line supplying power to the outside. Further ensuring the safety of power utilization.
Drawings
FIG. 1 is a schematic diagram of an electric energy meter over-voltage and over-current protection system of the present invention;
FIG. 2 is a schematic diagram of a first pre-processing module of the present invention;
FIG. 3 is a schematic diagram of a second pre-processing module of the present invention.
The protection system comprises an electric energy meter overvoltage andovercurrent protection system 100, acurrent divider 101, avoltage acquisition module 102, afirst preprocessing module 103, a first signal amplification sub-module 1031, afirst shaping sub-module 1032, acurrent acquisition module 104, asignal conversion module 105, asecond preprocessing module 106, a secondsignal amplification sub-module 1061, asecond shaping sub-module 1062, afirst judgment module 107, asecond judgment module 108, an opencircuit protection module 109, a singlechip microcomputer module 110, adisplay module 111, acontrol module 112, athird judgment module 113 and afourth judgment module 114.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Fig. 1 shows an overvoltage andovercurrent protection system 100 for an electric energy meter according to the present invention, which mainly includes: the circuit breaker comprises acurrent divider 101, avoltage acquisition module 102, afirst preprocessing module 103, acurrent acquisition module 104, asignal conversion module 105, asecond preprocessing module 106, afirst judgment module 107, asecond judgment module 108 and a circuitbreaking protection module 109. Theshunt 101 is used for shunting and sampling a live wire connected to the electric energy meter, and in the invention, theshunt 101 adopts a manganese-copper shunt. Thevoltage collecting module 102 is used for collecting a voltage signal of thecurrent divider 101. Thefirst preprocessing module 103 preprocesses the voltage signal acquired by thevoltage acquisition module 102 to obtain a first comparison voltage. Thecurrent collecting module 104 is used for collecting the current signal of thecurrent divider 101. Thesignal conversion module 105 is configured to convert the current signal collected by thecurrent collection module 104 into a voltage signal. Thesecond preprocessing module 106 is configured to preprocess the voltage signal converted by thesignal conversion module 105 to obtain a second comparison voltage. The first determiningmodule 107 is configured to compare the first comparison voltage with a preset first voltage value, and send a first open-circuit signal to the open-circuit protection module 109 when the first comparison voltage is greater than the first voltage value. The second determiningmodule 108 is configured to compare the second comparison voltage with a preset second voltage value, and send a second open signal to the open-circuit protection module 109 when the second comparison voltage is greater than the second voltage value. The specific values of the first voltage value and the second voltage value can be set according to requirements. Thedisconnection protection module 109 cuts off a power supply line supplying power to the outside when receiving the first disconnection signal or the second disconnection signal as needed. By the over-voltage andover-current protection system 100 for the electric energy meter, when the current or the voltage of the electric energy meter is too large, the electric energy meter can automatically cut off a power supply circuit supplying power to the outside, and potential safety hazards are reduced.
As a preferred embodiment, as shown in fig. 2 and 3, thefirst pre-processing module 103 includes a first signal amplifying sub-module and afirst shaping sub-module 1032 block. Thesecond pre-processing module 106 includes a secondsignal amplification sub-module 1061 and asecond shaping sub-module 1062.
Specifically, the first signal amplification sub-module is configured to amplify the voltage signal acquired by thevoltage acquisition module 102. Thefirst shaping submodule 1032 is configured to shape the voltage signal amplified by the first signal amplification submodule to obtain a first comparison voltage. The secondsignal amplifying submodule 1061 is configured to amplify the voltage signal converted by thesignal conversion module 105. Thesecond shaping submodule 1062 is configured to shape the voltage signal amplified by the secondsignal amplifying submodule 1061 to obtain a second comparison voltage.
As a preferred embodiment, the electric energy meter overvoltage andovercurrent protection system 100 further includes: asinglechip module 110 and adisplay module 111.
Specifically, when the first comparison voltage is greater than the first voltage value, the first determiningmodule 107 further sends a first display control signal to the singlechip microcomputer module 110, the singlechip microcomputer module 110 sends the first display signal to thedisplay module 111 after receiving the first display control signal, and thedisplay module 111 displays the voltage overload protection information, specifically, displays "U-over". When the second comparison voltage is greater than the second voltage value, thesecond judgment module 108 further sends a second display control signal to the singlechip microcomputer module 110, the singlechip microcomputer module 110 sends the second display signal to thedisplay module 111 after receiving the second display control signal, and thedisplay module 111 displays the current overload protection information, specifically, displays "I-over". It will be appreciated that the information displayed may be adjusted as desired.
In a preferred embodiment, the electric energy meter overvoltage andovercurrent protection system 100 further comprises acontrol module 112 for user operation.
In the case that the open-circuit protection module 109 cuts off power supply, when the user eliminates the risk, thecontrol module 112 may be operated to send a power-on control signal to thesingle chip module 110. Thesingle chip module 110 receives the power-on control signal, and then sends a power-on signal to the opencircuit protection module 109 and a clear signal to thedisplay module 111. The opencircuit protection module 109 receives the power-on signal and then recovers the power supply line supplying power to the outside. Thedisplay module 111 stops displaying the voltage overload protection information or the current overload protection information after receiving the clear signal.
As an alternative implementation, the first determiningmodule 107 is a first comparator. The second determiningmodule 108 is a second comparator.
Specifically, thefirst preprocessing module 103 sends the preprocessed first comparison voltage to the first comparator, and when the first comparison voltage is greater than the first voltage value, the first comparator outputs a high-frequency signal to the open-circuit protection module 109. Thesecond preprocessing module 106 sends the preprocessed second comparison voltage to the second comparator, and when the second comparison voltage is greater than the second voltage value, the second comparator outputs a high-frequency signal to the open-circuit protection module 109.
As an alternative embodiment, thedisconnection protection module 109 comprises a pulse generator and a relay.
When the first comparison voltage is larger than the first voltage value, the first comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off. When the second comparison voltage is larger than the second voltage value, when the second comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off.
In a preferred embodiment, the electric energy meter overvoltage andovercurrent protection system 100 further includes athird determination module 113 and afourth determination module 114.
It will be appreciated that in some cases, the first comparison voltage does not exceed the predetermined first voltage value at all times, but there may be a safety hazard when operating for a long time in a high voltage region close to the first voltage value. Therefore, preferably, in the present invention, the third determiningmodule 113 is configured to determine whether the first comparison voltage is between a preset third voltage value and the first voltage value, and send a third open signal to the open-circuit protection module 109 when a time that the first comparison voltage is continuously between the third voltage value and the first voltage value reaches a first preset time, where the third voltage value is smaller than the first voltage value. Similarly, the fourth determiningmodule 114 is configured to determine whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and send a fourth open signal to the open-circuit protection module 109 when the time that the second comparison voltage is continuously between the fourth voltage value and the second voltage value reaches the first preset time. Thedisconnection protection module 109 cuts off a power supply line supplying power to the outside when receiving the third disconnection signal or the fourth disconnection signal.
As another alternative embodiment, the electric energy meter overvoltage andovercurrent protection system 100 also includes athird determination module 113 and afourth determination module 114. The third and fourth judgingmodules module 113 is configured to determine whether the first comparison voltage is between a preset third voltage value and the first voltage value, and in a second preset time, when the time accumulation of the first comparison voltage between the third voltage value and the first voltage value reaches the first preset time, the third determiningmodule 113 sends a third open-circuit signal to the open-circuit protection module 109, where the third voltage value is smaller than the first voltage value. The fourth determiningmodule 114 is configured to determine whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and in a second preset time, when the time accumulation of the second comparison voltage between the fourth voltage value and the second voltage value reaches the first preset time, the fourth determiningmodule 114 sends a fourth open-circuit signal to the open-circuit protection module 109, where the fourth voltage value is smaller than the second voltage value. Thedisconnection protection module 109 cuts off a power supply line supplying power to the outside when receiving the third disconnection signal or the fourth disconnection signal. And the second preset time is greater than the first preset time. In this embodiment, the first comparison voltage does not need to be continuously between the third voltage value and the first voltage value for the first preset time, but the accumulated time of the first comparison voltage between the third voltage value and the first voltage value for the second preset time reaches the first preset time, which is in accordance with the power-off condition. Similarly, in the second preset time, the accumulated time of the second comparison voltage between the fourth voltage value and the second voltage value reaches the first preset time, and the power-off condition is met. Specifically, the first preset time is set to be half of the second preset time.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (10)
1. An electric energy meter overvoltage and overcurrent protection system is characterized by comprising: the circuit breaker comprises a current divider, a voltage acquisition module, a first preprocessing module, a current acquisition module, a signal conversion module, a second preprocessing module, a first judgment module, a second judgment module and a circuit breaking protection module;
the voltage acquisition module is used for acquiring a voltage signal of the current divider;
the first preprocessing module preprocesses the voltage signal acquired by the voltage acquisition module to obtain a first comparison voltage;
the current acquisition module is used for acquiring a current signal of the current divider;
the signal conversion module is used for converting the current signal acquired by the current acquisition module into a voltage signal;
the second preprocessing module is used for preprocessing the voltage signal converted by the signal conversion module to obtain a second comparison voltage;
the first judging module is used for comparing the first comparison voltage with a preset first voltage value and sending a first open circuit signal to the open circuit protection module when the first comparison voltage is greater than the first voltage value;
the second judging module is used for comparing the second comparison voltage with a preset second voltage value and sending a second circuit breaking signal to the circuit breaking protection module when the second comparison voltage is greater than the second voltage value;
and the circuit breaking protection module cuts off a power supply circuit supplying power to the outside when receiving the first circuit breaking signal or the second circuit breaking signal.
2. The electric energy meter overvoltage and overcurrent protection system according to claim 1,
the electric energy meter overvoltage and overcurrent protection system further comprises: the single chip microcomputer module and the display module;
when the first comparison voltage is larger than the first voltage value, the first judgment module also sends a first display control signal to the single chip microcomputer module, the single chip microcomputer module sends a first display signal to the display module after receiving the first display control signal, and the display module displays voltage overload protection information;
when the second comparison voltage is greater than the second voltage value, the second judgment module further sends a second display control signal to the single-chip microcomputer module, the single-chip microcomputer module receives the second display control signal and then sends a second display signal to the display module, and the display module displays current overload protection information.
3. The electric energy meter overvoltage and overcurrent protection system according to claim 2,
the electric energy meter overvoltage and overcurrent protection system also comprises a control module for user operation;
the control module is used for receiving the operation of a user and sending a power-on control signal to the singlechip module;
the single chip microcomputer module receives the power-on control signal and then sends a power-on signal to the circuit breaking protection module and a clearing signal to the display module;
the circuit breaking protection module recovers a power supply circuit supplying power to the outside after receiving the power-on signal;
and the display module stops displaying the voltage overload protection information or the current overload protection information after receiving the clearing signal.
4. The electric energy meter overvoltage and overcurrent protection system according to claim 3,
the first judging module is a first comparator;
the second judging module is a second comparator;
the first preprocessing module sends a preprocessed first comparison voltage to the first comparator, and when the first comparison voltage is larger than the first voltage value, the first comparator outputs a high-frequency signal to the open-circuit protection module;
and the second preprocessing module sends a preprocessed second comparison voltage to the second comparator, and when the second comparison voltage is greater than the second voltage value, the second comparator outputs a high-frequency signal to the open-circuit protection module.
5. The electric energy meter overvoltage and overcurrent protection system according to claim 4,
the circuit breaking protection module comprises a pulse generator and a relay;
when the first comparison voltage is larger than the first voltage value, the first comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off;
when the second comparison voltage is larger than the second voltage value, when the second comparator outputs a high-frequency signal to the pulse generator, the pulse generator sends a pulse signal to the relay, and the relay is switched off.
6. The electric energy meter overvoltage and overcurrent protection system according to claim 1,
the electric energy meter overvoltage and overcurrent protection system further comprises a third judgment module and a fourth judgment module;
the third judging module is used for judging whether the first comparison voltage is between a preset third voltage value and the first voltage value or not and sending a third open circuit signal to the open circuit protection module when the time that the first comparison voltage is continuously between the third voltage value and the first voltage value reaches a first preset time, wherein the third voltage value is smaller than the first voltage value;
the fourth judging module is used for judging whether the second comparison voltage is between a preset fourth voltage value and the second voltage value or not and sending a fourth open circuit signal to the open circuit protection module when the time that the second comparison voltage is continuously between the fourth voltage value and the second voltage value reaches the first preset time;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the third open circuit signal or the fourth open circuit signal.
7. The electric energy meter overvoltage and overcurrent protection system according to claim 1,
the electric energy meter overvoltage and overcurrent protection system further comprises a third judgment module and a fourth judgment module;
the third judging module is configured to judge whether the first comparison voltage is between a preset third voltage value and the first voltage value, and send a third open-circuit signal to the open-circuit protection module within a second preset time when the time accumulation of the first comparison voltage between the third voltage value and the first voltage value reaches the first preset time, where the third voltage value is smaller than the first voltage value, and the second preset time is longer than the first preset time;
the fourth judging module is configured to judge whether the second comparison voltage is between a preset fourth voltage value and the second voltage value, and send a fourth open-circuit signal to the open-circuit protection module when the time of the second comparison voltage between the fourth voltage value and the second voltage value reaches the first preset time within the second preset time, where the fourth voltage value is smaller than the second voltage value;
and the open circuit protection module cuts off a power supply line supplying power to the outside when receiving the third open circuit signal or the fourth open circuit signal.
8. The electric energy meter overvoltage and overcurrent protection system according to claim 7,
the first preset time is half of the second preset time.
9. The electric energy meter overvoltage and overcurrent protection system according to claim 1,
the first preprocessing module comprises a first signal amplification sub-module and a first shaping sub-module;
the second preprocessing module comprises a second signal amplification sub-module and a second shaping sub-module;
the first signal amplification submodule is used for amplifying the voltage signal acquired by the voltage acquisition module;
the first shaping submodule is used for shaping the voltage signal amplified by the first signal amplification submodule to obtain the first comparison voltage;
the second signal amplification submodule is used for amplifying the voltage signal converted by the signal conversion module;
the second shaping submodule is used for shaping the voltage signal amplified by the second signal amplification submodule to obtain the second comparison voltage.
10. The electric energy meter overvoltage and overcurrent protection system according to claim 1,
the shunt is a manganese copper shunt.
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| WO2024077115A1 (en)* | 2022-10-06 | 2024-04-11 | Landis+Gyr Technology, Inc. | Electricity meter with grid-side voltage sensing |
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| WO2024077115A1 (en)* | 2022-10-06 | 2024-04-11 | Landis+Gyr Technology, Inc. | Electricity meter with grid-side voltage sensing |
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