Method for recognizing lightning interference by utilizing average sampling value of short-window inner polar wave
A technology of lightning interference and identification method, which is applied in the direction of fault location, etc., to achieve the effect of good robustness, strong practicability, and strong performance
Active Publication Date: 2011-08-17
KUNMING UNIV OF SCI & TECH
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The invention relates to a method for recognizing lightning interference by utilizing an average sampling value of a short-window inner polar wave, comprising the steps of: after a protection element starts, solving polar wave voltage according to polar line voltage and polar line current which are obtained through measurement at a relay installed place and according to formulas; directly utilizing the sampling values of the polar wave voltage and the steady-state polar line voltage in a short window; solving a ratio of the polar wave voltage to the polar line voltage which runs in a steady state; and recognizing the lightning interference by utilizing the size of the ratio, wherein the sampling frequency is 10kHz, the time widow is 5ms, the sampling is not influenced by a control system,and the time-delay protection is in a ms level. By utilizing the method, the lightning interference in a full-length range of a line can be accurately recognized. The method has good robustness, verystrong performance of tolerating a transition resistance and stronger practicality and is not influenced by the interference. Proved by vast simulation results, the method provided by the invention has good effect.
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