A Method of Extracting and Recognizing Discharge Current of Bird Hazard Hidden Danger Based on Wavelet Transform

摘要

Bird damage is one of the important reasons that affect the safe and stable operation of overhead transmission lines. The main cause of bird-caused hidden-danger discharge is the pollution flashover of insulator caused by bird manure. Using traveling wave positioning system to monitor and identify potential bird hazards before bird hazards cause overhead transmission line faults is an important means to prevent bird hazard faults. Therefore, how to identify and extract the Bird-caused hidden-danger current has become the key to the accurate operation of traveling wave positioning and early warning system. In order to solve this problem, a method of extracting and recognizing discharge current of bird hazard hidden danger is proposed in this paper. Based on the principle of phase-shift subtraction and wavelet transform, this method subtracts the total current of normal-working phase from the total current of hidden-discharge phase, and then identifies and extracts the characteristic of hidden-danger current by wavelet transform, so as to realize the recognition and early warning of bird-caused hidden danger discharge. In this paper, the ATP electromagnetic transient simulation platform is used to simulate the bird hazard potential discharge and the wavelet analysis of the potential discharge current is carried out with MATLAB, which proves the effectiveness and feasibility of the above method.