Identification of EHV lightning interference

EHV transmission lines of relay protection device undertakes the important task, these protections inevitably are affected by various high frequency signal interference, which lightning is the main interference factor. Therefore, lightning interference recognition technology research for super-fast protection can adapt fast and accurate movements, the practical significance as soon as possible. This paper adopts the current transient components for frequency spectrum analysis to study the distribution of different situations energy distribution, finds out the differences, and get to analysis based on the waveform feature transient current, to differentiate on the transmission induction lightning, direct lightning and common fault. Through this method, reach the purpose of identifying lightning interference to ensure protection no fault actions.