Method and device for solving inconsistent differential protection actions of double sets of buses in transformer
A technology of protection action and solution, applied in the field of power system protection, can solve the problems of wrong judgment of operation and maintenance personnel, spending a lot of time and energy, inconvenient operation and maintenance, etc., to achieve the effect of stable operation guarantee
Active Publication Date: 2012-01-18
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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[0003] However, since there are many intermediate links in the failure protection to start the bus differential protection trip, it takes a lot of time and energy to analyze and judge from the source one by one, and the time for power failure inspection will inevitably increase, which is very unfavorable to the operation of the power grid.
The existence of the above problems makes the double-set busbar differential protection of the 500kV substation run with hidden dangers. The action behavior of the two sets of busbar differential protection is inconsistent, which will inevitably cause wrong judgments by the operation and maintenance personnel and bring inconvenience to the operation and maintenance. Therefore, measures must be taken to correct solve
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[0014] Example: as figure 1 As shown, taking the 500kV substation as an example, in order to solve the problem of the inconsistency of the differential protection actions of the two sets of buses, the applicant adopts the following steps to judge:
[0015] a. Test the time of each set of busbar differential action separately; the test method is to use the signal received by the start input point of the circuit breaker protection device in the line as the time start point, and the trip contact of the busbar differential protection device Receive the signal as the end point of the time, and calculate the time used by each set of bus differential protection; the specific test method is to use a microcomputer relay protection tester, through the start input point of the microcomputer relay protection tester and the circuit breaker protection device Connect, and add the input signal, and connect the trip output contact of the bus differential protection with the microcomputer relay...
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The invention discloses a method and device for solving inconsistent differential protection actions of double sets of buses in a transformer. The method comprises the following steps of: testing the differential action time of each set of buses as follows: using the time that a start input point of a breaker protective device in a circuit receives a signal as a time starting point, and the time that a trip point of a bus differential protective device receives the signal as a time destination, measuring and calculating the time used by each set of bus differential protection, and recording; and comparing the protection action difference in real with the filed record, when the protection actions of the double sets of configurations are inconsistent, rapidly judging the problem and better solving the problem. The device and method of the invention provide powerful guarantee for the stable operation of a power station.
Description
technical field [0001] The invention relates to a method and a device for solving the inconsistency of differential protection actions of two sets of busbars in a substation, and belongs to the technical field of power system protection. Background technique [0002] At present, the 500kV bus differential protection in the 500kV substation is equipped with double protection according to the regulations. There are many manufacturers of the existing 500kV bus differential protection. The products of each manufacturer are not the same, and the performance is also different. For the The logic of the failure protection to initiate bus differential tripping is also different. In the actual operation of a 500kV substation, it was found that when a certain 500kV line failed to protect the bus differential, the action behavior of the two sets of bus differential protection was inconsistent. Only one set of bus differential protection tripped and the other set did not operate. Accord...
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Inventor 周伟彭小俊
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD