A Fault Discrimination Method for Generator Negative Sequence Component
A technology of fault discrimination and negative sequence components, which is applied in the direction of electrical components, emergency protection circuit devices, etc., can solve problems such as inability to guarantee, achieve long duration, facilitate discrimination and protection actions, and ensure selectivity
Active Publication Date: 2019-01-01
XUJI GRP +2
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Problems solved by technology
[0004] The purpose of the present invention is to provide a fault discrimination method for the negative sequence component of the generator, which is used to solve the problem that the protection cannot be guaranteed to be reliable and not malfunction when the system fails, and the protection of the negative sequence direction of the fault component is reliable and quick to operate when the generator has an inter-turn fault. The problem
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[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0027] A fault discrimination method for generator negative sequence components, the steps are:
[0028] 1) Increment the terminal negative-sequence current and terminal negative-sequence voltage corresponding to the sampling time t1 in the data area with the corresponding terminal negative-sequence current and terminal negative-sequence voltage in the data area at a time one cycle before the sampling time t1 Calculate, calculate terminal negative sequence current increment and terminal negative sequence voltage increment
[0029] 2), according to the terminal negative sequence current increment and terminal negative sequence voltage increment Calculate the negative sequence power increment (ΔP 2 ), and perform fault identification.
[0030] Based on the above technical solutions and in conjunction with the accompanying drawings, the following speci...
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The invention relates to a fault judging method of a power generator negative sequence component. The method includes the steps of firstly, performing incremental calculation on the corresponding end negative sequence currents and end negative sequence voltage, in a data area, of a sampling moment t1 and the corresponding end negative sequence currents and end negative sequence voltage, in the data area, of a moment one cycle before the sampling moment t1, and calculating end negative sequence current increment deltaI2 and end negative sequence voltage increment deltaU2; secondly, calculating negative sequence power increment deltaP2 according to the deltaI2 and the deltaU2, and performing fault judging. The method has the advantages that the method is based on fault component negative sequence directions and uses the theoretical foundation of negative sequence power direction protection to guarantee the selectivity of protection actions; reliable protection during system faults is achieved, action mistakes are avoided, and the protection in the fault component negative sequence direction and fast action during power generator turn-to-turn faults are achieved.
Description
technical field [0001] The invention relates to a fault discrimination method for a negative sequence component of a generator, belonging to the field of relay protection of electric power systems. Background technique [0002] At present, the internal short-circuit main protection of large and medium-sized generators, all countries in the world adopt longitudinal differential protection without exception. Since this protection action criterion has clear selectivity and high sensitivity to most protected equipment, it has been used for nearly a hundred years. It is the undisputed protection scheme for the internal short circuit of the master device. However, with the increase of the unit capacity of the generator, its technical requirements for relay protection are getting higher and higher. Many modern large-scale turbogenerators adopt two-branch structure, and the lead bars of each phase and each branch are connected in parallel in the machine through parallel connecting ...
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IPC IPC(8): H02H7/06
Inventor 陈海龙刘艳东徐玉洁陈干杰王志广徐立明肖志刚沈燕华石伟张军红
Owner XUJI GRP