李晓斌,赵东阳,钟光强,吴昊,王琪,姚陈果,王俊凯.基于小波能量谱的输电线路雷击故障识别方法研究[J].电测与仪表,2014,51(12):. LI Xiao-bin,ZHAO Dong-yang,ZHONG Guang-qiang,WU Hao,WANG Qi,YAO Chen-guo,WANG Jun-kai.Identification Method of Lightning Fault for Transmission Line based on Wavelet Energy Spectrum[J].Electrical Measurement & Instrumentation,2014,51(12):.
基于小波能量谱的输电线路雷击故障识别方法研究
Identification Method of Lightning Fault for Transmission Line based on Wavelet Energy Spectrum
Accurate identification of lightning fault is of great significance for improving the transmission line lightning protection design. In this paper, the three-phase travelling wave current is studied. Based on the wavelet energy spectrum, a lightning fault identification method is established. According to the distribution characteristics of wavelet energy spectrum for different lightning faults, the corresponding characteristic and fault identification criterion are constructed. The simulation results show that, the method is not affected by parameters and waveforms of lightning current models. It can distinguish accurately the three fault types, which is shielding failure without flashover, shielding failure with flashover and back flashover. By choosing the threshold value and setting the detection point reasonably, it can respectively avoid the effect of lightning impulse corona and reflected wave at the end of the line on the accuracy of the method. Thus, the method has high practical value.
