Method and device for double-bus single-disconnection to prevent false tripping of abnormal bus-coupling/section due to out-of-area faults
An out-of-area fault, double bus single technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as system wiring changes, system voltage fluctuations, tripping of bus tie 1 circuit breaker, etc., to avoid false trips that are not related Effects of abnormal bus tie/section circuit breakers
Active Publication Date: 2018-09-25
XUJI GRP +3
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Problems solved by technology
However, due to the large differential current generated by the fault in the Ⅲ bus zone, and the removal of the bus tie 2 and section circuit breaker related to the Ⅲ bus, the small differential current and the braking current of the I bus and the II bus may meet the braking characteristics. At the same time, the fault of bus III may cause the voltage fluctuation of the system, satisfy the opening condition of differential pressure recovery, and finally cause the instantaneous tripping of the circuit breaker of bus tie 1
[0007] Therefore, for the double-bus single-section connection mode, under the premise that the bus coupler / section current is abnormal and the two adjacent bus sections of the bus coupler / section have no internal faults, according to the conventional bus differential protection, one more busbar will be cut. Bus connection or subsection will eventually lead to changes in the system wiring mode, which will cause more unpredictable consequences, which is unacceptable to most users
Method used
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[0048] The above steps will be described in detail below with reference to the accompanying drawings.
[0049] The present invention proposes a method for preventing out-of-area faults from falsely tripping abnormal bus couplers / sections with double buses and single divisions. The method obtains the area differential protection range of abnormal bus couplers / sections to determine the area within the differential protection range Whether the current characteristics of the abnormal bus coupler / section meet the differential protection criterion, and finally determine whether the abnormal bus coupler or section needs to be disconnected in the case of an intra-area fault on other busbars that are not adjacent to the abnormal bus coupler / section.
[0050]Among them, for the regional differential protection range of any bus coupler / section under the double-bus single-section connection mode is as follows figure 2 As shown, the area differential protection range of bus coupler 1 is a...
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The present invention relates to a method and device for preventing external failures from wrongly jumping to an abnormal bus coupler / segment under double buses and a single component. The method or device comprises the following steps: when bus coupler / segment current is abnormal, acquiring steps or units of regional differential protection ranges corresponding to the abnormal bus coupler / segment; judging whether current features in the regional differential protection ranges satisfy regional differential protection criteria or not, and if yes, opening an action exit of a corresponding bus coupler / segment breaker; and otherwise, implementing a step or unit of locking the action exit of the corresponding bus coupler / segment breaker. According to the method and device disclosed by the invention, the technical problem that when the bus coupler / segment current is abnormal, the external failures of the buses are wrongly jumped to the abnormal bus coupler / segment breaker under a double-bus and single-component wire connection mode in a bus protection process can be solved.
Description
technical field [0001] The invention relates to a method and a device for preventing out-of-area faults from accidentally tripping abnormal bus couplers / sections with double buses and single partitions, and belongs to the technical field of power system fault judgment. Background technique [0002] When the busbar protection is running in parallel, if the busbar / section current is abnormal (such as the busbar / section CT disconnection, the busbar / section SV inspection inconsistent, etc.), the two busbars connected to the busbar / section There is a small differential current, but no large differential current. At this time, the busbar protection does not start, and the busbar differential protection does not operate. However, when a fault occurs on the busbar, because the protection device cannot determine the direction of the busbar / section CT current, the busbar protection may refuse to operate, or it may malfunction. At this time, the action behavior of the busbar protection...
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IPC IPC(8): H02H7/22H02H7/26
CPCH02H7/22H02H7/26
Inventor 肖锋黄继东胡沙沙冯广杰龚赟王智勇李书圣王志伟张延海唐宇耿继伟
Owner XUJI GRP