Bus differential protection vector concentrated test method
A technology of bus differential protection and test method, applied in the field of electric power grid, can solve the problems of high risk of power grid, personal equipment, failure to meet the requirements of vector test, no load of branches, etc., so as to shorten working time and work intensity, and reduce labor intensity. , to ensure the correctness of the effect
Inactive Publication Date: 2016-03-09
STATE GRID CORP OF CHINA +1
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Problems solved by technology
This method has the following problems: the commissioning personnel need to wait for the power transmission operation of the branch circuit before proceeding, each branch circuit power transmission must be tested once, and the bus differential protection needs to be shut down for each test, and the work efficiency is low; The branch circuit to be transported has no load or very low load, which cannot meet the vector test requirements. The testers need to wait for the load current to meet the test requirements, which consumes energy. In addition, the test work is carried out during the power transmission process, and the power grid, personal and equipment risks are relatively high. high
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[0019] The present invention will be further elaborated below in conjunction with specific embodiments and accompanying drawings.
[0020] Such as figure 1 As shown, the busbar M, the branches L1, L2, L3...L12 are not charged, the circuit breakers QF1, QF2, QF3...QF12 are all in the open state, and the grounding switches QS10, QS20, QS30, and QS40 are in the closed state , other switches QS01, QS02, QS03, QS04 are disconnected.
[0021] The centralized testing method of bus differential protection vector includes the following steps:
[0022] Such as figure 1 As shown, take phase A of branch L1 as the reference branch, and phase A of branch L2 as the branch to be tested as an example to illustrate the test wiring.
[0023] (1) Test wiring
[0024] First connect the polar terminal I+ of the large current ratio tester to the primary side P11 of the current transformer TA1 of the reference branch L1A phase, and then connect the non-polar terminal I- of the large current ratio...
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The invention discloses a bus differential protection vector concentrated test method. A large-current transformation ratio tester is used to add current to a primary side so as to simulate load current; with some branch connected to a bus being a reference, the relationship between phase and magnitudes of current of the other branches of the bus differential protection is detected, and thus whether the bus differential protection current secondary loop wiring is correct is judged. The method can carry out vector concentrated test on braches connected to bus differential protection under-35kV switch cabinet wiring in the substation construction acceptance process, thereby solving the problem that vector test cannot be carried out under the condition of no load or light load of branches newly put into use, and the problems of long vector test period and bus differential repeated stop due to different operation terms of normal branches; the method does not need power transmission operation of operation personnel, thereby reducing work intensity and improving work efficiency; and the method is carried out before power transmission starting, thereby improving safety of power transmission starting process.
Description
technical field [0001] The invention relates to the technical field of electric power grids, in particular to a method for centralized testing of bus-differential protection vectors for bus-differential protection acceptance of newly-built substations. Background technique [0002] At present, in the acceptance of secondary equipment in new substations, the vector test of bus differential protection is generally carried out during the start-up of power transmission. protection to operate. This method has the following problems: the commissioning personnel need to wait for the power transmission operation of the branch circuit before proceeding, each branch circuit power transmission must be tested once, and the bus differential protection needs to be shut down for each test, and the work efficiency is low; The branch circuit to be transported has no load or very low load, which cannot meet the vector test requirements. The testers need to wait for the load current to meet t...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 刘春成熊天禄王丽李建泽张杰苑存超李克峰张治邦
Owner STATE GRID CORP OF CHINA