10kV feeder line short-circuit test method
Technical field
The present invention relates to a kind of phenomenon of the failure simulation of distribution automation system, the test method of fault treating procedure test, belong to electrical power distribution automatization system (DAS), fields such as power distribution network simulation test.
Background technology
At present, test to the distribution automation engineering generally is to adopt the method that distribution network automated main website, substation and terminal are tested respectively, but feeder automation many critical functions such as (FA) that distribution automation system has fault judgement, isolation and perfects regional restore funcitons must adopt the method for testing of system just can detect, and fault handling needs main website, substation, terminal, communication system and switchgear fellowship, cooperation.In addition, some application functions of distribution automation system, as: load prediction, economical operation, expansion power supply capacity etc. also lack effective means of testing.
Professor Liu Dong of Shanghai Communications University studies the electrical power distribution automatization system measuring technology, once published " electrical power distribution automatization system test " book, but the measuring technology and the delivery test method that mainly stress each production procedure of manufacturing enterprise, but be not suitable for carrying out the fielded system test.
Professor Liu Jian of Shaanxi Electric Power Research Institute has carried out certain research to the electrical power distribution automatization system measuring technology, has developed feeder automation experimental test platform, but this test board also is towards the laboratory, is difficult to carry out on-the-spot test.
Abroad do not appear in the newspapers in the achievement in research aspect the electrical power distribution automatization system test yet; situation about recognizing from the channel of investigation and academic exchange is: the way that adopts relay-protection tester simulation feeder fault is abroad arranged; but all be to carry out, be difficult to carry out on-the-spot test in the laboratory.Therefore need to study new, effective distribution automation system method of testing.
At present existing distribution automation Engineering Testing Technique is tested separately distribution network automated main website, substation and terminal respectively, the system detection method that lacks critical functions such as fault judgement, isolation and sound zone recovery to distribution automation system, lack method of testing, also lack the means of testing of application functions such as load prediction to distribution automation system, economical operation, expansion power supply capacity main website, substation, terminal, communication system and the common cooperation of switchgear in the fault treating procedure.Compared with the prior art,
Summary of the invention
The objective of the invention is at present distribution network automated shortage efficient system means of testing, a kind of 10kV feeder line short-circuit test method of testing is provided, by special impedor is directly inserted the 10kV overhead feeder, form true controlled 10kV short trouble, thereby the power distribution automation fault treating procedure is systematically tested.
Technical scheme of the present invention is achieved in that
1) preceding position and power supply transformer station's impedance and transformer short-circuit impedance according to selected overhead transmission line short dot of experiment calculated this short dot generation two-phase nonmetal character fault and short-circuit current and is limited in the required phase fault impedance magnitude of 500A-1000A;
2) with the 2 Europe reactor series and parallels of a plurality of permissions, obtain testing required short-circuit impedance by 1000A;
3) short-circuit impedance element and 10kV intelligent breaker direct serial are inserted the two alternate of 10kV overhead feeder;
4) by tripping again behind the closed 300ms of telechiric device control 10kV intelligent breaker, the two-phase transient fault of 10kV feeder line is tested;
5) by the closed and no longer tripping of telechiric device control 10kV intelligent breaker, the two-phase permanent fault of 10kV feeder line is tested.
This method of testing is calculated two-phase nonmetal character short-circuit current according to tested distribution feeder system impedance, dispose suitable high capacity short-circuit impedance, short-circuit current is reduced to below the 1000A, reduce the impact of short-circuit current to system, carry out the instantaneous and permanent short test of real power distribution network overhead feeder two-phase, the fault handling of comprehensive assessment electrical power distribution automatization system and Self healing Strategy function.
Advantage of the present invention is: the on-the-spot test means to the simple type that contains overhead transmission line, practical, standard form, integrated-type, intelligent electrical power distribution automatization system fault treating procedure are provided; System testing means to the fault treating procedure of distribution network automated main website, substation, terminal, protection cooperation, standby power supply, communication and feeder switch are provided, and phenomenon of the failure is true and reliable.
Description of drawings
Fig. 1 is a 10kV overhead feeder short-circuit test method synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Before the test, be limited in the required phase fault impedance magnitude of 500A-1000A according to the position of selected overhead transmission line short dot and power transformer station's impedance and this short dot generation two-phase nonmetal character fault of Calculation of transformer short-circuit impedance and short-circuit current, with a plurality of resistance values is 2 Europe reactor connection in series-parallel, obtains required short-circuit impedance flexibly.
10kV overhead feeder C is through 10kV intelligent breaker, current transformer, the high capacity short-circuit impedance (see figure 1) that is connected with A, and two-phase nonmetal character short trouble promptly takes place the 10kV intelligent breaker that closes under the control of intelligent remote control device.The branch time of closing of intelligent remote control device control 10kV intelligent breaker is caused 10kV overhead feeder two-phase transient fault or two-phase permanent fault during test.Test two-phase transient fault; only need the tripping again after (about 300ms) of closing a period of time of 10kV intelligent breaker; the breaker closing time is protected the time of action, the tripping of feeder line isolating switch greater than the 10kV overhead feeder, and separates before the action of 10kV overhead feeder isolating switch reclosing.Test two-phase permanent fault just can not separated after the 10kV intelligent breaker closes.
The control protective device of intelligent breaker prevents because of feeder line isolating switch tripping causing power distribution network supply transformer back-up protection action as one of safety precautions of excising fault in the test, causes power distribution network power failure expanded range, test to end.