CN102636683B - 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 PDFInfo
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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
Technical field
The present invention relates to electric system power plant, the test of the various DC power system short-circuit current of transformer station estimate and straight-flow system DC circuit breaker selectivity verification method, be specially a kind of based on small area analysis sudden change DC power system short-circuit current testing device and method.
Background technology
DC power system is the visual plant ensureing that power system safety and stability runs.During normal operation, straight-flow system provides power switch, for relay protection and aut.eq., communication etc. provide working power for isolating switch; During fault, particularly when AC interruptions, straight-flow system is relay protection and aut.eq., the conjunction tripping operation of isolating switch, emergency lighting provide safe and reliable direct supply.Straight-flow system is the basic guarantee 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 direct current supply reliability.The rationality that DC circuit breaker is selected and the correctness of Graded coordination can ensure in case of emergency, and DC power system provides reliable source of power for high-voltage AC breaker breaker tripping and closing and protection, communication and aut.eq..Therefore how to judge that the correctness of the rationality that DC circuit breaker is selected and Graded coordination is at present in the urgent need to the problem of research.
The selectivity of direct supply protective device is not only relevant with the characteristic of protective device itself, and also short-circuit current at different levels with DC power system is relevant.Direct current protecting electrical equipment needs to configure according to the size of DC power system short-circuit current at different levels, and verifies the selectivity of DC circuit breaker according to short-circuit current size.Therefore the size testing or calculate direct supply short-circuit current is needed.In recent years, some electrical power run unit utilizes substation field battery pack to carry out short circuit simulation test to the Graded coordination of direct current protecting electrical equipment, adopt the instrument test such as oscillograph, multimeter short-circuit current, break, verify the selectivity of substation field straight-flow system Graded coordination; The real simulated field actual short fault of the method energy also verifies DC system protection electrical equipment Graded coordination situation; but in test process; once DC feeder loop to be measured Graded coordination can not meet the requirement of selective protection; upper level protective device overstep tripping will be caused; cause other normal feeder assembly dead electricity and cause electric power accident, cannot the security of warranty test, and test process and data analysis need all manually complete; complex operation, potential safety hazard is more.
Summary of the invention
Of the present invention
objectjust be to provide a kind of direct supply short-circuit current proving installation based on small area analysis sudden change and method; it is for the deficiency of existing electric power DC system short-circuit current method of testing; the test achieving DC power system short-circuit current at different levels is estimated, and then can verify the selectivity of direct supply protective device.
Of the present invention
technical schemefor:
A kind of DC power system short-circuit of the present invention current testing device, whole proving installation forms by testing major loop, control loop, sampling circuit and data processing management unit;
Described test major loop is made up of positive/negative main electrical scheme terminal, more than one IGBT pipe and resistive load, shunt one second part, between positive/negative main electrical scheme terminal, be connected in series shunt circuit and the shunt primary connection end of IGBT pipe and resistive load, form test major loop;
Described control loop is made up of supervisor, I/O card and each IGBT pipe control end, described supervisor is an industrial computer being provided with TT&C software, by USB interface and I/O cartoon letters, the control end grid being connected to IGBT pipe is exported by I/O card, by the break-make of control IGBT pipe, realize Current adjustment and the disjunction of test major loop;
Described sampling circuit by positive/negative sampling terminal, data collecting card and shunt two second part form, the voltage sample end of data collecting card connects positive/negative sampling terminal, and current sample end connects shunt secondary output terminal; Test accesses the DC voltage after the continuous off-state voltage before adjustable electric resistive load and access adjustable electric resistive load and electric current;
Described data processing management unit by supervisor by USB interface and data acquisition cartoon letters, gather DC voltage and electric current, and automatically calculate the short-circuit current of this default short-circuit point of DC power system, and by USB interface and I/O cartoon letters, automatically control Current adjustment and the disjunction of test major loop.
The present invention is based on the DC power system short-circuit current method of testing of small area analysis sudden change, the steps include:
1. test line: first disconnected by a certain for feeder assembly to be measured for In situ DC system default short dot DC circuit breaker, untie its end opening load, be connected respectively above-mentioned proving installation positive and negative main electrical scheme terminal and the positive and negative sampling terminal of proving installation at the positive and negative terminals of this short dot isolating switch end opening; After connecting good circuit, more closed default short dot DC circuit breaker, and ensure that on DC feeder loop to be measured, other all direct current protecting electrical equipment is all in co-bit;
2. parameters: after wiring completes, starts supervisor TT&C software, arranges model and the load current value of In situ DC system feeder assembly direct current protecting electrical equipment;
3. produce mutation current and data acquisition: after optimum configurations completes, start test, in proving installation, supervisor is by USB interface and data acquisition cartoon letters, gathers continuous off-state voltage by data collecting card voltage sample end; Linked the grid connecing each IGBT pipe control end again by I/O through USB interface by supervisor, according to the load current value of the isolating switch that isolating switch in setup parameter and proving installation connect, control each resistive load connection number and produce suitable test small area analysis, respectively gather DC loop voltage and current by USB interface connection data capture card by voltage, current sample end by supervisor simultaneously; After collection completes, then disconnect test major loop through USB interface by the grid of each IGBT pipe of I/O card control by supervisor;
4. carry out calculation of short-circuit current: by formula R=(E-U
1)/I
1the end opening calculating straight-flow system DC circuit breaker to be measured presets short-circuit point equivalent resistance R, then estimates this real short circuit electric current I by formula I=E/R, and in formula, E represents described continuous off-state voltage, U
1represent described DC loop voltage, I
1represent described DC loop current, R represent straight-flow system loop equivalent resistance, I test point actual short electric current;
5. in-situ FTIR spectroelectrochemitry: after having tested, safety removes test connecting line, and restoring scene.
The short-circuit current method of testing of other positions and said method are identical.
Of the present invention
beneficial effectfor:
Proving installation of the present invention and method can realize the function being gone out actual short electric current by the electric current during sudden change of measurement small area analysis and voltage estimate.Principle of work by: first disconnect and surveyed DC power system one-level DC circuit breaker load side and preset short-circuit point actual load, at the open-circuit voltage E of this some measurement direct supply; Again in this default short-circuit point through resistive load R
1carry out the sudden change of small area analysis instantaneous discharge generation current, measure loop voltage U now
1with small area analysis I
1; Then by formula R=(E-U
1)/I
1calculate straight-flow system loop equivalent resistance R; This actual short electric current I is estimated finally by formula I=E/R.
Its advantage of the present invention can be summarized as: (1) this proving installation and method utilize small area analysis method of suddenling change to test and estimate out actual short electric current, and the big current produced when avoiding direct short-circuit, to the impact of battery pack, reduces the impact on the life of storage battery.(2) the method handling safety, reliable, can not cause upper level protective device overstep tripping cause other normal feeder assembly dead electricity and cause electric power accident, also eliminate the hidden danger that in process of the test, big current endangers personal safety simultaneously.(3) operated by supervisor, whole test process completes automatically, without the need to manual intervention, simple to operate, easy to use.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the DC power system short-circuit current proving installation embodiment that the present invention is based on small area analysis sudden change,
Fig. 2 is the field wiring figure of the DC power system short-circuit current method of testing embodiment that the present invention is based on small area analysis sudden change,
Fig. 3 is the FB(flow block) of the DC power system short-circuit current method of testing embodiment that the present invention is based on small area analysis sudden change.
Embodiment
As shown in Figure 1, a kind of DC power system short-circuit current testing device CSY, be made up of 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-type number adopts USB6009, data collecting card model to adopt USB5132, supervisor MCU, positive/negative main electrical scheme terminal 1 and positive/negative sampling terminal 2.Each part mentioned above connected mode is as follows: test major loop is made up of C, E pole of positive/negative main electrical scheme terminal 1, IGBT pipe V1 ~ Vn, a second part of resistive load R1 ~ Rn and shunt FL, between positive/negative main electrical scheme terminal 1, be connected in series shunt circuit and the shunt FL primary connection end of IGBT pipe V1 ~ Vn and resistive load R1 ~ Rn, form test 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 being provided with TT&C software, by USB interface and I/O cartoon letters, exported by I/O card and connect IGBT pipe V1 ~ Vn grid, the break-make of control IGBT pipe V1 ~ Vn, realizes Current adjustment and the disjunction of test major loop; Sampling circuit is made up of positive/negative sampling terminal 2, data collecting card and shunt FL bis-second part, and data collecting card voltage sample end connects positive/negative sampling terminal 2, and current sample end connects shunt FL bis-output terminals.Continuous off-state voltage when test I GBT pipe V1 ~ Vn disconnects and IGBT pipe V1 ~ Vn all or part of connect time DC voltage and electric current; Data processing management unit by upper managing computer MCU by USB interface and data acquisition cartoon letters, gather DC voltage and electric current, automatically the short-circuit current of this default short-circuit point of DC power system is calculated, by USB interface and I/O cartoon letters, automatically control Current adjustment and the disjunction of test major loop.
During testing experiment, field wiring as shown in Figure 2, disconnect In situ DC system feeder assembly DC circuit breaker to be measured SK3, untie its end opening and preset short-circuit point actual load, the positive and negative terminals of this isolating switch SK3 end opening are corresponding on the one hand connects the positive and negative main electrical scheme terminal 1 of above-mentioned proving installation CSY, and correspondence connects the positive and negative sampling terminal 2 of above-mentioned proving installation on the other hand; Closed DC circuit breaker SK3 again, and ensure that other all direct current protecting electrical equipment on DC feeder loop to be measured (comprising battery insurance FU1, isolating switch ZK1, ZK2, S12 at different levels) is all in co-bit.
As shown in Figure 3, be the DC power system short-circuit current test method FB(flow block) based on small area analysis sudden change, comprise following step:
1: test line: first feeder assembly to be measured for In situ DC system is preset short dot DC circuit breaker SK3 and disconnect, untie its end opening load, be connected respectively above-mentioned proving installation positive and negative main electrical scheme terminal and the positive and negative sampling terminal of proving installation at the positive and negative terminals of this short dot isolating switch end opening; After connecting good circuit, more closed default short dot DC circuit breaker SK3, and ensure that on DC feeder loop to be measured, other all direct current protecting electrical equipment is all in co-bit.
2: parameters.After completing by Fig. 2 wiring, start supervisor and TT&C software is set, model and the load current value of In situ DC system feeder assembly direct current protecting electrical equipment (comprising battery insurance FU1, isolating switch ZK1, ZK2, S12 and SK3 at different levels) is set.
3: produce mutation current and data acquisition.After optimum configurations completes, start test, supervisor MCU is communicated with data collecting card USB5132 by USB interface, gathers continuous off-state voltage E by data collecting card USB5132 voltage sample end; Connected the G pole of IGBT pipe V1 ~ Vn again by I/O card USB6009 through USB interface by supervisor MCU, according to isolating switch SK3 load current value in setup parameter, controlling resistance load R1 ~ Rn connects number and produces suitable test small area analysis, gathers DC loop voltage U 1 and electric current I 1 respectively by supervisor MCU by USB interface connection data capture card USB5132 by voltage, current sample end simultaneously; After collection completes, then disconnect test major loop through USB interface by the G pole of I/O card USB6009 control IGBT pipe V1 ~ Vn by supervisor MCU.
4: calculation of short-circuit current.By formula R=(E-U
1)/I
1calculate straight-flow system DC circuit breaker SK3 end opening and preset short-circuit point equivalent resistance R, then estimate this real short circuit electric current I by formula I=E/R.
5: in-situ FTIR spectroelectrochemitry.After having tested, safety removes test connecting line, and restoring scene.
The short-circuit current method of testing of other positions is identical with said process.
Claims (2)
1., based on a small area analysis sudden change DC power system short-circuit current testing device, it is characterized in that described proving installation forms by testing major loop, control loop, sampling circuit and data processing management unit;
Described test major loop is made up of positive/negative main electrical scheme terminal, more than one IGBT pipe and resistive load, shunt one second part, between positive/negative main electrical scheme terminal, be connected in series shunt circuit and the shunt primary connection end of IGBT pipe and resistive load, form test major loop;
Described control loop is made up of supervisor, I/O card and each IGBT pipe control end, described supervisor is an industrial computer being provided with TT&C software, by USB interface and I/O cartoon letters, the control end grid being connected to IGBT pipe is exported by I/O card, by the break-make of control IGBT pipe, realize Current adjustment and the disjunction of test major loop;
Described sampling circuit by positive/negative sampling terminal, data collecting card and shunt two second part form, the voltage sample end of data collecting card connects positive/negative sampling terminal, and current sample end connects shunt secondary output terminal;
Described data processing management unit by supervisor by USB interface and data acquisition cartoon letters, gather DC voltage and electric current, and automatically calculate the short-circuit current that DC power system presets short-circuit point, by USB interface and I/O cartoon letters, automatically control Current adjustment and the disjunction of test major loop;
Describedly to test as follows based on small area analysis sudden change DC power system short-circuit current testing device:
(1) line is tested: first disconnected by a certain for feeder assembly to be measured for In situ DC system default short dot DC circuit breaker, untie its end opening load, be connected respectively above-mentioned proving installation positive and negative main electrical scheme terminal and the positive and negative sampling terminal of proving installation at the positive and negative terminals of this short dot isolating switch end opening; After connecting good circuit, more closed default short dot DC circuit breaker, and ensure that on DC feeder loop to be measured, other all direct current protecting electrical equipment is all in co-bit;
(2) parameters: after wiring completes, starts supervisor TT&C software, arranges model and the load current value of In situ DC system feeder assembly direct current protecting electrical equipment;
(3) produce mutation current and data acquisition: after optimum configurations completes, start test, in proving installation, supervisor is by USB interface and data acquisition cartoon letters, gathers continuous off-state voltage by data collecting card voltage sample end; Linked the grid connecing each IGBT pipe control end again by I/O through USB interface by supervisor, according to the load current value of the isolating switch that setup parameter isolating switch and proving installation connect, control each resistive load connection number and produce suitable test small area analysis, respectively gather DC loop voltage and current by USB interface connection data capture card by voltage, current sample end by supervisor simultaneously; After collection completes, then disconnect test major loop through USB interface by the grid of each IGBT pipe of I/O card control by supervisor;
(4) calculation of short-circuit current is carried out: by formula R=(E-U
1)/I
1the end opening calculating straight-flow system DC circuit breaker to be measured presets short-circuit point equivalent resistance R, then estimates this real short circuit electric current I by formula I=E/R, and in formula, E represents described continuous off-state voltage, U
1represent described DC loop voltage, I
1represent described DC loop current, R represent straight-flow system loop equivalent resistance, I test point actual short electric current;
(5) in-situ FTIR spectroelectrochemitry: after having tested, safety removes test connecting line, and restoring scene.
2. the method for testing based on small area analysis sudden change DC power system short-circuit current testing device according to claim 1, is characterized in that: its method step is:
(1) line is tested: first disconnected by a certain for feeder assembly to be measured for In situ DC system default short dot DC circuit breaker, untie its end opening load, be connected respectively above-mentioned proving installation positive and negative main electrical scheme terminal and the positive and negative sampling terminal of proving installation at the positive and negative terminals of this short dot isolating switch end opening; After connecting good circuit, more closed default short dot DC circuit breaker, and ensure that on DC feeder loop to be measured, other all direct current protecting electrical equipment is all in co-bit;
(2) parameters: after wiring completes, starts supervisor TT&C software, arranges model and the load current value of In situ DC system feeder assembly direct current protecting electrical equipment;
(3) produce mutation current and data acquisition: after optimum configurations completes, start test, in proving installation, supervisor is by USB interface and data acquisition cartoon letters, gathers continuous off-state voltage by data collecting card voltage sample end; Linked the grid connecing each IGBT pipe control end again by I/O through USB interface by supervisor, according to the load current value of the isolating switch that setup parameter isolating switch and proving installation connect, control each resistive load connection number and produce suitable test small area analysis, respectively gather DC loop voltage and current by USB interface connection data capture card by voltage, current sample end by supervisor simultaneously; After collection completes, then disconnect test major loop through USB interface by the grid of each IGBT pipe of I/O card control by supervisor;
(4) calculation of short-circuit current is carried out: by formula R=(E-U
1)/I
1the end opening calculating straight-flow system DC circuit breaker to be measured presets short-circuit point equivalent resistance R, then estimates this real short circuit electric current I by formula I=E/R, and in formula, E represents described continuous off-state voltage, U
1represent described DC loop voltage, I
1represent described DC loop current, R represent straight-flow system loop equivalent resistance, I test point actual short electric current;
(5) in-situ FTIR spectroelectrochemitry: after having tested, safety removes test connecting line, and restoring scene.
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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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Inventor after: Li Bingyu Inventor after: Chen Xiaodong Inventor after: Hao Xiaoguang Inventor after: Pan Jin Inventor after: Fan Hui Inventor after: Ma Jianhui Inventor after: Wang Haobin Inventor after: Liu Yong Inventor before: Li Bingyu Inventor before: Chen Xiaodong Inventor before: Hao Xiaoguang Inventor before: Pan Jin Inventor before: Fan Hui Inventor before: Ma Jianhui Inventor before: Wang Haobin |
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Effective date of registration: 20180123 Address after: 050021 Shijiazhuang Province, Yuhua Province Sports street, South Street, No. 238, No. Co-patentee after: State Grid Corporation of China Patentee after: Power Science Research Institute of Hebei Electric Power Co., Ltd. Co-patentee after: National network Hebei Energy Technology Service Co., Ltd. Co-patentee after: Hebei Chuangke Electronic Technology Co., Ltd. Co-patentee after: Handan power supply branch, Hebei Electric Power Co., Ltd. Address before: 050091 Hebei high tech District of Shijiazhuang City Xinshi North Road, No. 86 Co-patentee before: State Grid Corporation of China Patentee before: Hebei Electric Power Construction & Adjustment Research Institute Co-patentee before: Electric Power Research Institute of Hebei Electric Power Corporation |
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