CN102636683A - Test device and method for short-circuit current of direct-current power supply system based on low-current burst power - Google Patents

Test device and method for short-circuit current of direct-current power supply system based on low-current burst power Download PDF

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CN102636683A
CN102636683A CN2012101451729A CN201210145172A CN102636683A CN 102636683 A CN102636683 A CN 102636683A CN 2012101451729 A CN2012101451729 A CN 2012101451729A CN 201210145172 A CN201210145172 A CN 201210145172A CN 102636683 A CN102636683 A CN 102636683A
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current
short
circuit
test
loop
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CN102636683B (en
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李秉宇
陈晓东
郝晓光
潘瑾
范辉
马建辉
王浩彬
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HEBEI CHUANGKE ELECTRONIC TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Hebei Electric Power Co Ltd
State Grid Hebei Energy Technology Service Co Ltd
Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
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Hebei Electric Power Construction Adjustment Test Institute
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Abstract

The invention relates to a test device and a method for a short-circuit current of a direct-current power supply system based on low-current burst power. The test device consists of a main test loop, a control loop, a sampling loop and a data processing management unit, and comprises more than one IGBT (insulated gate bipolar translator) V1-Vn, corresponding resistive loads R1-Rn, a current diverter FL, an I/O (input/output) card, a data collection card, a manager MCU (micro-programmed control unit), a positive/negative main connecting terminal 1 and a positive/negative sampling terminal 2. The method comprises the following steps: 1, wiring for a test, 2, setting parameters, 3, generating a burst current and collecting data, 4, calculating the short-circuit current, and 5, restoring on site. Aiming at the disadvantages of the existing test method for the short-circuit current of the direct-current power system, with the adoption of the test device and the method provided by the invention, each level of the short-circuit current of the direct-current power supply system can be tested and estimated, so that the selectivity of an electric protective device of a direct-current power supply can be checked.

Description

Based on little current break DC power system short-circuit current testing device and method
Technical field
The test that the present invention relates to electric system power plant, the various DC power system short-circuit currents of transformer station is estimated and the method for straight-flow system dc circuit breaker selectivity verification, is specially a kind of DC power system short-circuit current testing device and method based on little current break.
Background technology
DC power system is the visual plant that guarantees the power system safety and stability operation.During normal operation, straight-flow system is that isolating switch provides power switch, for relay protection and aut.eq., communication etc. provide working power; During fault, particularly under the situation of AC interruptions, straight-flow system be relay protection and aut.eq., isolating switch close tripping operation, emergency lighting provides safe and reliable direct supply.Straight-flow system is the basic assurance of relay protection of power system, aut.eq. and isolating switch correct operation, and the safe operation of transformer station has very high requirement to the direct current supply reliability.The rationality that dc circuit breaker is selected and the correctness of differential cooperation can guarantee that in case of emergency DC power system is that high-voltage AC breaker breaker tripping and closing and protection, communication and aut.eq. provide reliable source of power.Therefore how to judge that the rationality of dc circuit breaker selection and the correctness of differential cooperation are the problems that presses for research at present.
The selectivity of direct supply protection electrical equipment is not only relevant, also relevant with DC power system short-circuit currents at different levels with the characteristic of protection electrical equipment itself.Direct current protecting electrical equipment need dispose based on the size of DC power system short circuit currents at different levels, and comes the selectivity of verification dc circuit breaker based on the short circuit current size.Therefore the size that needs test or calculating direct supply short-circuit current.In recent years; Part operation power unit utilizes the on-the-spot battery pack of transformer station that the short circuit simulation test is carried out in the differential cooperation of direct current protecting electrical equipment; Adopt instrument test short-circuit current, breaks such as oscillograph, multimeter, come the selectivity of the differential cooperation of the on-the-spot straight-flow system of verification transformer station; This method is simulated field actual short fault and the differential mated condition of verification dc system protection electrical equipment really, but in the test process, in case the differential cooperation in dc feeder to be measured loop can not be satisfied the requirement of selective protection; Will cause upper level protection electrical equipment overstep tripping; Cause other normal feeder assembly dead electricity and cause electric power accident, security that can't warranty test, and test process and data analysis need all artificial the completion; Complex operation, potential safety hazard is more.
Summary of the invention
Of the present invention PurposeJust be to provide a kind of direct supply short-circuit current proving installation and method based on little current break; It is to the deficiency of existing electric power DC system short-circuit current method of testing; Realized that the test of DC power system short-circuit currents at different levels estimates, and then selectivity that can verification direct supply protection electrical equipment.
Of the present invention Technical schemeFor:
A kind of DC power system short-circuit of the present invention current testing device, whole testing device is made up of test major loop, control loop, sampling circuit and data processing management unit;
Said test major loop by just/negative main electrical scheme terminal, above IGBT pipe and resistive load, shunt once part form; Just/negative main electrical scheme terminal between shunt circuit and the shunt primary connection end of serial connection IGBT pipe and resistive load, formation is tested major loop;
Said control loop is made up of supervisor, I/O card and each IGBT pipe control end; Said supervisor is an industrial computer that TT&C software is installed; By USB interface and I/O cartoon letters; Be connected to the control end grid of IGBT pipe by the output of I/O card; By the break-make of control IGBT pipe, realize that the electric current of test major loop is regulated and disjunction;
Said sampling circuit by just/negative sampling terminal, data collecting card and shunt Secondary Part form, the voltage sample end of data collecting card is just connecting/negative sampling terminal, current sample end connection shunt secondary output terminal; DC voltage and electric current after test inserts the continuous off-state voltage before the resistive load of adjustable electric and inserts the resistive load of adjustable electric;
Said data processing management unit passes through USB interface and data acquisition cartoon letters by supervisor; Gather DC voltage and electric current; And this presets the short-circuit current of short-circuit point to calculate DC power system automatically; And through USB interface and I/O cartoon letters, the Current Regulation and the disjunction of control test major loop automatically.
The present invention is based on the DC power system short-circuit current method of testing of little current break, the steps include:
1. test line: at first a certain preset short dot dc circuit breaker of on-the-spot straight-flow system feeder assembly to be measured is broken off; Untie its end opening load, at the corresponding respectively positive and negative main electrical scheme terminal of above-mentioned proving installation and the positive and negative sampling terminal of proving installation of connecting of positive and negative terminals of this short dot isolating switch end opening; After connecting good circuit, closed more preset short dot dc circuit breaker, and guarantee that other all direct current protecting electrical equipment all are on the dc feeder to be measured loop and close the position;
2. parameter is set: after wiring is accomplished, start the supervisor TT&C software, the model and the load current value of on-the-spot straight-flow system feeder assembly direct current protecting electrical equipment is set;
3. produce mutation current and data acquisition: after parameter is provided with completion, start test, supervisor is gathered continuous off-state voltage through USB interface and data acquisition cartoon letters by data collecting card voltage sample end in the testing arrangement; Manage the grid of control end again through each IGBT of I/O card connection through USB interface by supervisor; Based on breaker in the setup parameter is the load current value of the breaker of testing arrangement connection; Control each resistive load and connect the suitable little electric current of test of number generation, connect data collecting card by supervisor through USB interface simultaneously and gather the DC loop voltage and current respectively through voltage, current sample end; After gathering completion, the grid of being managed through each IGBT of I/O card control through USB interface by supervisor breaks off the test major loop again;
4. carry out calculation of short-circuit current: through formula R=(E-U 1)/I 1Calculate the preset short-circuit point equivalent resistance R of end opening of straight-flow system dc circuit breaker to be measured, estimate this through formula I=E/R again and put true short-circuit current I, E represents said continuous off-state voltage, U in the formula 1Represent said DC loop voltage, I 1Represent said DC loop electric current, R to represent straight-flow system loop equivalent resistance, I test point actual short electric current;
5. on-the-spot the recovery: after test was accomplished, safety was removed the test connecting line, and recovered on-the-spot.
The short-circuit current method of testing and the said method of other positions are identical.
Of the present invention Beneficial effectFor:
The function that electric current when proving installation according to the invention and method can realize suddenling change through measured current and voltage estimate go out the actual short electric current.Principle of work by: at first break off and surveyed DC power system one-level dc circuit breaker load side and preset the short-circuit point actual load, at the open-circuit voltage E of this point measurement direct supply; Again at this preset short-circuit point process resistive load R 1Carry out little electric current instantaneous discharge and produce current break, measure the loop voltage U of this moment 1With little electric current I 1; Then through formula R=(E-U 1)/I 1Calculate straight-flow system loop equivalent resistance R; Estimate this actual short electric current I through formula I=E/R at last.
Its advantage of the present invention can be summarized as: (1) this proving installation and method utilize little current break method test to estimate out the actual short electric current, and the big electric current that produces when having avoided direct short-circuit has reduced the influence to the life of storage battery to the impact of battery pack.(2) this method handling safety, reliable can not cause that upper level protection electrical equipment overstep tripping causes other normal feeder assembly dead electricity and causes electric power accident, has also eliminated the hidden danger that big electric current endangers personal safety in the process of the test simultaneously.(3) operate through supervisor, whole test process is accomplished automatically, need not manual intervention, and is simple to operate, easy to use.
Description of drawings
Fig. 1 is the schematic diagram that the present invention is based on the DC power system short-circuit current proving installation embodiment of little current break,
Fig. 2 is the field wiring figure that the present invention is based on the DC power system short-circuit current method of testing embodiment of little current break,
Fig. 3 is the FB(flow block) that the present invention is based on the DC power system short-circuit current method of testing embodiment of little current break.
Embodiment
As shown in Figure 1; A kind of DC power system short-circuit current testing device CSY; Form by test major loop, control loop, sampling circuit and data processing management unit; Comprise more than one IGBT pipe V1~Vn, corresponding resistive load R1~Rn, shunt FL, I/O card model adopt USB6009, data collecting card model adopt USB5132, supervisor MCU, just/negative main electrical scheme terminal 1 and just/negative sampling terminal 2.The each part mentioned above connected mode is following: the test major loop by just/the once part of C, the E utmost point, resistive load R1~Rn and the current divider FL of negative main electrical scheme terminal 1, IGBT pipe V1~Vn forms; Just/negative main electrical scheme terminal 1 between shunt circuit and the current divider FL primary connection end of serial connection IGBT pipe V1~Vn and resistive load R1~Rn, formation is tested major loop; Control loop adopts the I/O card of USB6009 and the control end of IGBT pipe V1~Vn to form by supervisor MCU, model; Supervisor MCU is an industrial computer that TT&C software is installed; By USB interface and I/O cartoon letters; Connect IGBT pipe V1~Vn grid by the output of I/O card; The break-make of control IGBT pipe V1~Vn realizes that the electric current of test major loop is regulated and disjunction; Sampling circuit by just/negative sampling terminal 2, data collecting card and current divider FL Secondary Part form, data collecting card voltage sample end is just connecting/is bearing the terminal 2 of sampling, current sample end connection current divider FL secondary output.DC voltage and electric current when continuous off-state voltage when test I GBT pipe V1~Vn breaks off and all or part of connection of IGBT pipe V1~Vn; The data processing management unit passes through USB interface and data acquisition cartoon letters by upper managing computer MCU; Gather DC voltage and electric current; Automatically calculate DC power system and should preset the short-circuit current of short-circuit point; Through USB interface and I/O cartoon letters, the Current Regulation and the disjunction of control test major loop automatically.
During testing experiment; Field wiring is as shown in Figure 2; Break off on-the-spot straight-flow system feeder assembly dc circuit breaker to be measured SK3; Untie the preset short-circuit point actual load of its end opening, the corresponding on the one hand positive and negative main electrical scheme terminal 1 of above-mentioned proving installation CSY that connects of the positive and negative terminals of this isolating switch SK3 end opening, the corresponding on the other hand positive and negative sampling terminal 2 of above-mentioned proving installation that connects; Closed again dc circuit breaker SK3, and guarantee that other all direct current protecting electrical equipment on the dc feeder to be measured loop (comprising battery insurance FU1, isolating switch ZK1 at different levels, ZK2, S12) all are in and close the position.
As shown in Figure 3, be based on the DC power system short-circuit current test method FB(flow block) of little current break, comprise following step:
1: the test line: at first the preset short dot dc circuit breaker SK3 of on-the-spot straight-flow system feeder assembly to be measured is broken off; Untie its end opening load, at the corresponding respectively positive and negative main electrical scheme terminal of above-mentioned proving installation and the positive and negative sampling terminal of proving installation of connecting of positive and negative terminals of this short dot isolating switch end opening; After connecting good circuit, closed more preset short dot dc circuit breaker SK3, and guarantee that other all direct current protecting electrical equipment all are on the dc feeder to be measured loop and close the position.
2: parameter is set.After pressing Fig. 2 wiring completion, start supervisor TT&C software is set, on-the-spot straight-flow system feeder assembly direct current protecting the electrical equipment model and the load current value of (comprising battery insurance FU1, isolating switch ZK1 at different levels, ZK2, S12 and SK3) are set.
3: produce mutation current and data acquisition.After parameter is provided with completion, start test, supervisor MCU communicates by letter with data collecting card USB5132 through USB interface, gathers continuous off-state voltage E by data collecting card USB5132 voltage sample end; The G utmost point that connects IGBT pipe V1~Vn again by supervisor MCU through USB interface through I/O card USB6009; Based on breaker SK3 load current value in the setup parameter; Controlling resistance property load R1~Rn connects number and produces the suitable little electric current of test, connects data collecting card USB5132 by supervisor MCU through USB interface simultaneously and gathers DC loop voltage U 1 and electric current I 1 respectively through voltage, current sample end; After collection is accomplished, manage the G utmost point disconnection test major loop of V1~Vn again through I/O card USB6009 control IGBT through USB interface by supervisor MCU.
4: calculation of short-circuit current.Through formula R=(E-U 1)/I 1Calculate the preset short-circuit point equivalent resistance R of straight-flow system dc circuit breaker SK3 end opening, estimate this through formula I=E/R again and put true short-circuit current I.
5: the on-the-spot recovery.After test was accomplished, safety was removed the test connecting line, and recovered on-the-spot.
The short-circuit current method of testing of other positions is identical with said process.

Claims (2)

1. one kind based on little current break DC power system short-circuit current testing device, it is characterized in that said proving installation is made up of test major loop, control loop, sampling circuit and data processing management unit;
Said test major loop by just/negative main electrical scheme terminal, above IGBT pipe and resistive load, shunt once part form; Just/negative main electrical scheme terminal between shunt circuit and the shunt primary connection end of serial connection IGBT pipe and resistive load, formation is tested major loop;
Said control loop is made up of supervisor, I/O card and each IGBT pipe control end; Said supervisor is an industrial computer that TT&C software is installed; By USB interface and I/O cartoon letters; Be connected to the control end grid of IGBT pipe by the output of I/O card; By the break-make of control IGBT pipe, realize that the electric current of test major loop is regulated and disjunction;
Said sampling circuit by just/negative sampling terminal, data collecting card and shunt Secondary Part form, the voltage sample end of data collecting card is just connecting/negative sampling terminal, current sample end connection shunt secondary output terminal;
Said data processing management unit passes through USB interface and data acquisition cartoon letters by supervisor; Gather DC voltage and electric current; And this presets the short-circuit current of short-circuit point to calculate DC power system automatically; Through USB interface and I/O cartoon letters, the Current Regulation and the disjunction of control test major loop automatically.
2. according to the method for testing based on little current break DC power system short-circuit current testing device of claim 1, it is characterized in that: its method step is:
(1) test line: at first a certain preset short dot dc circuit breaker of on-the-spot straight-flow system feeder assembly to be measured is broken off; Untie its end opening load, at the corresponding respectively positive and negative main electrical scheme terminal of above-mentioned proving installation and the positive and negative sampling terminal of proving installation of connecting of positive and negative terminals of this short dot isolating switch end opening; After connecting good circuit, closed more preset short dot dc circuit breaker, and guarantee that other all direct current protecting electrical equipment all are on the dc feeder to be measured loop and close the position;
(2) parameter is set: after wiring is accomplished, start the supervisor TT&C software, the model and the load current value of on-the-spot straight-flow system feeder assembly direct current protecting electrical equipment is set;
(3) produce mutation current and data acquisition: after parameter is provided with completion, start test, supervisor is gathered continuous off-state voltage through USB interface and data acquisition cartoon letters by data collecting card voltage sample end in the testing arrangement; Manage the grid of control end again through each IGBT of I/O card connection through USB interface by supervisor; Based on the setup parameter breaker is the load current value of the breaker of testing arrangement connection; Control each resistive load and connect the suitable little electric current of test of number generation, connect data collecting card by supervisor through USB interface simultaneously and gather the DC loop voltage and current respectively through voltage, current sample end; After gathering completion, the grid of being managed through each IGBT of I/O card control through USB interface by supervisor breaks off the test major loop again;
(4) carry out calculation of short-circuit current: through formula R=(E-U 1)/I 1Calculate the preset short-circuit point equivalent resistance R of end opening of straight-flow system dc circuit breaker to be measured, estimate this through formula I=E/R again and put true short-circuit current I, E represents said continuous off-state voltage, U in the formula 1Represent said DC loop voltage, I 1Represent said DC loop electric current, R to represent straight-flow system loop equivalent resistance, I test point actual short electric current;
(5) the on-the-spot recovery: after test was accomplished, safety was removed the test connecting line, and recovered on-the-spot.
CN201210145172.9A 2012-05-11 2012-05-11 Test device and method for short-circuit current of direct-current power supply system based on low-current burst power Active CN102636683B (en)

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CN104391245A (en) * 2014-11-24 2015-03-04 国家电网公司 Method for detecting mechanical characteristics of circuit breaker
CN114114009A (en) * 2021-11-12 2022-03-01 株洲变流技术国家工程研究中心有限公司 Test method and system for verifying selective protection of direct current common bus system or device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104391245A (en) * 2014-11-24 2015-03-04 国家电网公司 Method for detecting mechanical characteristics of circuit breaker
CN114114009A (en) * 2021-11-12 2022-03-01 株洲变流技术国家工程研究中心有限公司 Test method and system for verifying selective protection of direct current common bus system or device

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