A kind of digital reverse-power relayTechnical field
The present invention relates to the automatic disconnection emergency protection circuit device for electric to voltage or current both response, especially a kind of numberWord formula reverse-power relay.
Background technology
Relay is a kind of electric control device, is to work as input quantity（Energizing quantity）Change reach as defined in when requiring, in electricityMake controlled volume that a kind of electrical equipment of predetermined Spline smoothing occur in gas output circuit.It has control system（Also known as input circuit）With by control system（Also known as output loop）Between interactive relationship, be commonly used in the control circuit of automation, it is actualOn be with low current go control high current operate one kind " automatic switch ".Therefore play automatically adjust in circuit, safeguard protectionActed on change-over circuit etc..And reverse-power relay refers to the relay with wattmeter, for the direction of sensory current, in parallel connectionIn unit, opposite direction electric current（Such as flow back to the electric current of generating set）Reverse-power relay can be started, the unit is broken with systemOpen.
Chinese patent（Authorization Notice No.：The U of CN 204886136, authorized announcement date：2015.12.16）Disclose a kind of inversePower relay, including housing, current detection circuit, voltage detecting circuit, timesharing product circuit in housing, power ratioCompared with output circuit；The input of current detection circuit and voltage detecting circuit with timesharing product circuit electrically connects, timesharing productThe output end of circuit electrically connects with input of the power ratio compared with output circuit, output end and power network electricity of the power ratio compared with output circuitConnection, although having over-current detection and warning function, for reverse-power relay, primary voltage transformer is due to general workMake near rated voltage, the relative error of introducing is smaller, and primary current transformer may in different current effective values andUnder phase operating mode, in particular by protective current transformer, the relative error introduced when electric current is smaller is larger, inverse probability afterRequirement of the electrical equipment to measurement accuracy is very high, and the error of primary current detection circuit can influence reverse-power relay performance.
The content of the invention
In order to overcome the error of the primary current transformer of existing reverse-power relay to influence reverse-power relay performanceDeficiency, the purpose of the present invention are to provide a kind of service-strong digital reverse-power relay.
The technical solution adopted for the present invention to solve the technical problems：A kind of digital reverse-power relay, including electric currentAcquisition Circuit, voltage collection circuit, resistance group, A/D change-over circuits, microprocessor, relay and generator, the current acquisitionCircuit is connected through resistance group with A/D change-over circuits, and voltage collection circuit is connected with A/D change-over circuits, the A/D change-over circuits withMicroprocessor is connected, and the microprocessor is connected with relay, the Control generator；Wherein, the current acquisitionCircuit includes high precision current transformer, current transformer, and the voltage collection circuit includes voltage transformer, the resistance groupIncluding resistance R3, resistance R4, the A/D change-over circuits include model ADC0809 a/d converter, and the microprocessor includesModel AT89C51RD2 chip microprocessor, the voltage transformer are connected to the output end of generator, the high accuracyCurrent transformer, current transformer are electrically connected by binding post with the output end of generator, the high precision current transformerThe current signal of collection is connected through resistance R3 with 12 pin of the a/d converter, the current signal warp of the current transformer collectionResistance R4 is connected with 16 pin of the a/d converter, and 11 pin of the a/d converter connect power supply, and 10 pin of the a/d converter are handed overPumping signal, 6 pin, 22 pin of the a/d converter correspond to be connected with 15 pin, 14 pin of the chip microprocessor respectively, described21 pin, 20 pin, 19 pin, 18 pin, 8 pin, 15 pin, 14 pin and 17 pin of a/d converter successively 1 pin with the chip microprocessor,2 pin, 3 pin, 4 pin, 5 pin, 6 pin, 7 pin and the connection of 8 pin, 23 pin, 24 pin, 25 pin and 13 pin of the a/d converter are grounded, instituteState one end connection of coil of 39 pin of chip microprocessor through resistance R2 and relay, the other end of the coil of the relayGround connection, the normally-closed contact of the relay are connected with generator.
Wherein it is preferred to the model AKH-0.66/G of the high precision current transformer.
Wherein it is preferred to the high precision current transformer summation current transformer uses the switching mode of stand-by heat to hairThe electric current of motor is acquired.
Wherein it is preferred to a kind of digital reverse-power relay also includes an oscillating circuit, the oscillating circuit with it is described micro-Processor connects, wherein, the oscillating circuit includes crystal oscillator X1, electric capacity C1, electric capacity C2, the crystal oscillator X1 one end and the listThe 19 pin connection of piece microprocessor, the crystal oscillator X1 other end are connected with 18 pin of the chip microprocessor, the electric capacity C1'sOne end is connected with 19 pin of the chip microprocessor, and one end of the electric capacity C2 connects with 18 pin of the chip microprocessorConnect, the other end of the electric capacity C1, the even ground connection of the electric capacity C2 other end.
Wherein it is preferred to a kind of digital reverse-power relay also includes a reset circuit, the reset circuit with it is described micro-Processor connects, wherein, the reset circuit includes electrochemical capacitor C3, resistance R1, and the positive pole of the electrochemical capacitor C3 connects power supply,Electrochemical capacitor C3 negative pole is connected with 9 pin of the chip microprocessor, one end of the resistance R1 and the monolithic microprocessorThe 9 pin connection of device, resistance R1 other end ground connection.
Wherein it is preferred to a kind of digital reverse-power relay also includes a warning circuit, the microprocessor and the reportAlert circuit connection, wherein, the warning circuit includes light emitting diode D1, resistance R5, resistance R6 and buzzer BUZ1, the hairOptical diode D1 positive pole is connected with resistance R6 one end, and 37 pin of the resistance R6 other end and the chip microprocessor connectConnect, the negative pole ground connection of the light emitting diode D1, one end of the buzzer BUZ1 is connected with resistance R5 one end, resistance R5'sThe other end is connected with 38 pin of the chip microprocessor, the other end ground connection of the buzzer BUZ1.
Wherein it is preferred to which the microprocessor is also connected with a serial communication modular and an ethernet interface module, useCommunicated in computer supervisory control system.
Wherein it is preferred to which the microprocessor is also connected with a memory module, the memory module stores including a DRAMDevice and a FRAM memory, the DRAM memory are used for program and calculate and cached when running, and the FRAM memory is used to protectDeposit definite value, protection act information and Fault Recorder Information.
Compared with prior art, beneficial effects of the present invention are as follows：
The present invention uses high precision current transformer summation current transformer, when electric current very little, using high precision current transformerCollection electric current, ensure measurement accuracy, when electric current is very big, using stand-by heat switching mode select current transformer collectionElectric current, meet range of linearity when electric current is very big, improve inverse probability after protection reliability, effectively solve existing inverse probability relayThe error of the primary current transformer of device influences the problem of reverse-power relay performance.
Brief description of the drawings
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is principle of the invention block diagram；
Fig. 2 is the electrical connection of current collection circuit in the present invention, A/D change-over circuits, microprocessor, relay and generatorFigure；
Fig. 3 is a kind of new installation wiring diagram of this reality；
Fig. 4 is the electrical connection diagram of warning circuit in the present invention.
Marked in figure：1. current collection circuit, 101. high precision current transformers, 102. current transformers；
2. resistance group, resistance R3, resistance R4；
3.A/D change-over circuits, 301.AD converters（Model：ADC0809）；
4. voltage collection circuit, 401. voltage transformers；
5. oscillating circuit, crystal oscillator X1, electric capacity C1, electric capacity C2；
6. reset circuit, electrochemical capacitor C3, resistance R1；
7. microprocessor, 701. chip microprocessors（Model：AT89C51RD2）；
8. relay, resistance R2；
9. generator；
10. warning circuit, light emitting diode D1, resistance R5, resistance R6 and buzzer BUZ1；
11. serial communication modular；
12. ethernet interface module；
13. memory module.
Embodiment
In Fig. 1, a kind of digital reverse-power relay, including current collection circuit 1, voltage collection circuit 4, resistance group2nd, A/D change-over circuits 3, microprocessor 7, relay 8 and generator 9, wherein, current collection circuit 1 turns through resistance group 2 and A/DChange circuit 3 to connect, voltage collection circuit 4 is connected with A/D change-over circuits 3, and A/D change-over circuits 3 are connected with microprocessor 7, micro- placeReason device 7 is connected with relay 8, and relay 8 controls generator 9.
In Fig. 2, Fig. 3, current collection circuit 1 includes high precision current transformer 101, current transformer 102, and voltage is adoptedCollector 4 includes voltage transformer 401, and resistance group 2 includes resistance R3, resistance R4, A/D change-over circuit 3 includes modelADC0809 a/d converter 301, microprocessor 7 includes model AT89C51RD2 chip microprocessor 701, in advance in listCopy into program in piece microprocessor 701, the program preset reference compares performance number, and can realize the information of voltage according to collection,Current information, current voltage vector value, current vector value are calculated, so as to draw performance number.Wherein, as shown in figure 3, voltageTransformer 401 is connected to the output end of generator 9 in the usual way, and high precision current transformer 101, current transformer 102 are equalElectrically connected by output end of the binding post in the usual way with generator 9.As shown in Figure 2 and Figure 3, high precision current transformer 101The current signal I1 of collection is connected through resistance R3 with 12 pin of a/d converter 301, the current signal I2 that current transformer 102 gathersIt is connected through resistance R4 with 16 pin of a/d converter 301,11 pin of a/d converter 301 connect power supply VCC, 10 pin of a/d converter 301Pumping signal is handed over, 6 pin, 22 pin of a/d converter 301 correspond to be connected with 15 pin, 14 pin of chip microprocessor 701 respectively, and AD turns21 pin, 20 pin, 19 pin, 18 pin, 8 pin, 15 pin, 14 pin and 17 pin of parallel operation 301 1 pin with chip microprocessor 701,2 successivelyPin, 3 pin, 4 pin, 5 pin, 6 pin, 7 pin and the connection of 8 pin, 23 pin, 24 pin, 25 pin and 13 pin of a/d converter 301 are grounded GND, single39 pin of piece microprocessor 701 are connected through resistance R2 with one end of the coil of relay 8, another termination of the coil of relay 8Ground GND, the normally-closed contact of relay 8 are connected with generator 9.
In fig. 2, in the present embodiment, the model AKH-0.66/G of high precision current transformer 101.
The summation current transformer 102 of high precision current transformer 101 of the present embodiment is using the switching mode of stand-by heat to hairThe electric current of motor 9 is acquired.When electric current very little, using the collection electric current of high precision current transformer 101, ensure measurement essenceDegree；When electric current is very big, the collection electric current of current transformer 102 is selected using the switching mode of stand-by heat, meets that electric current is very bigWhen the range of linearity, improve inverse probability after protection reliability, effectively solve the primary current mutual inductance of existing reverse-power relayThe error of device influences the problem of reverse-power relay performance.
The present invention operation principle be：When electric current very little, using the collection electric current of high precision current transformer 101, warpResistance R3 is converted to voltage signal, and into chip microprocessor 701, voltage is mutual for input after a/d converter 301 is AD convertedThe information of voltage that sensor 401 gathers is inputted into chip microprocessor 701 after a/d converter 301 is AD converted, and monolithic is micro-After processor 701 is calculated, current performance number is drawn, if current performance number contrasts with default power reference fiducial valueJudge whether inverse work(, if there is inverse work(phenomenon, after chip microprocessor 701 is delayed, make 39 pin of chip microprocessor 701 defeatedGo out high level, now the coil electricity of relay 8, the normally-closed contact closure of relay 8, cut off generator 9, ensure generator 9Reverse-power protection.When electric current is very big, measured using current transformer 102, range of linearity when electric current is very big can be met.
It need to further illustrate, as shown in Figure 1 and Figure 2, a kind of digital reverse-power relay of the present invention also shakes including oneCircuit 5 is swung, the oscillating circuit 5 is connected with microprocessor 7.In fig. 2, oscillating circuit 5 includes crystal oscillator X1, electric capacity C1, electric capacity C2,Crystal oscillator X1 one end is connected with 19 pin of chip microprocessor 701, the crystal oscillator X1 other end and 18 pin of chip microprocessor 701Connection, electric capacity C1 one end are connected with 19 pin of chip microprocessor 701, electric capacity C2 one end and chip microprocessor 70118 pin connect, the electric capacity C1 even ground connection GND of the other end, the electric capacity C2 other end.The oscillating circuit 5 is chip microprocessor 701Clock frequency is provided.
It need to further illustrate, as shown in Figure 1 and Figure 2, it is multiple that a kind of digital reverse-power relay of the present invention also includes onePosition circuit 6, the reset circuit 6 are connected with microprocessor 7.In fig. 2, reset circuit 6 includes electrochemical capacitor C3, resistance R1, electricitySolution electric capacity C3 positive pole meets power supply VCC, and electrochemical capacitor C3 negative pole is connected with 9 pin of chip microprocessor 701, and the one of resistance R1End is connected with 9 pin of chip microprocessor 701, resistance R1 other end ground connection GND.The reset circuit 6 can allow the micro- place of monolithicReason device 701 since program initially rerun.
It need to further illustrate, as Figure 1 and Figure 4, a kind of digital reverse-power relay of the present invention also includes a reportAlert circuit 10, the microprocessor 7 are connected with the warning circuit 10.In Fig. 4, warning circuit 10 include light emitting diode D1,Resistance R5, resistance R6 and buzzer BUZ1, light emitting diode D1 positive pole are connected with resistance R6 one end, the resistance R6 other endIt is connected with 37 pin of chip microprocessor 701, light emitting diode D1 negative pole ground connection GND, buzzer BUZ1 one end and resistanceR5 one end connection, the resistance R5 other end and 38 pin of chip microprocessor connect, buzzer BUZ1 other end ground connectionGND.When there is inverse probability, 38 pins and 37 pins of chip microprocessor 701 are high level so that light emitting diode D1Alarmed with buzzer BUZ1, staff can artificially be interfered, and carry out the inverse probability of protection generator in advance.
Need to further illustrate, as shown in figure 1, the present invention microprocessor 7 also with a serial communication modular 11 andOne ethernet interface module 12 connects, and for being communicated with computer supervisory control system, is provided convenience for remote control, and beThe data of inverse probability, which preserve, to be provided conveniently, and the inverse probability for later research generator provides substantial amounts of data supporting.
It need to further illustrate, as shown in figure 1, the microprocessor 7 of the present invention is also connected with a memory module, it is storedModule includes DRAM memory and FRAM memory, and DRAM memory is used for program and calculates and cached when running, FRAM storagesDevice is used to preserve definite value, protection act information and Fault Recorder Information.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be withA variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understandingAnd modification, the scope of the present invention is defined by the appended.