One kind being based on S-transformation power transmission and distribution fault protecting method and device
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The invention particularly discloses one kind to be based on S-transformation power transmission and distribution fault protecting method and device.The method comprising the steps of: building fault signature sample database D in advance;After transmission line of electricity breaks down, physical fault transient signal is acquired in transmission line of electricity one end, and handle physical fault transient signal using S-transformation and singular value decomposition, obtain physical fault time-frequency matrix;All sample matrix in physical fault time-frequency matrix and fault signature sample database D are subjected to matrix similarity calculation, obtain maximum matrix similarity β max ;According to the β max , determine that currently practical failure is troubles inside the sample space or external area error using preset Protection criteria;Troubles inside the sample space then issues trip command, isolated fault;External area error then latch-up protection device.The device includes sample building module, physical fault processing module, similarity calculation module and determination module.Methods and apparatus of the present invention can effectively promote the reliability of transmission line malfunction transient protection.