孙其东,张开如,伊利峰,宋祥民,李娅芸.基于五次谐波和小波重构能量的配电网单相接地故障的选线方法研究*[J].电测与仪表,2016,53(16):. sun qidong,zhangkairu,yilifeng,songxiangmin,liyayun.Single-phase?fault earth fault line selection method research of the distribution network based on fifth harmonics and wavelet ?reconstruction[J].Electrical Measurement & Instrumentation,2016,53(16):.
基于五次谐波和小波重构能量的配电网单相接地故障的选线方法研究*
Single-phase?fault earth fault line selection method research of the distribution network based on fifth harmonics and wavelet ?reconstruction
Abstract: In view of frequent single-phase grounding fault in distribution network system,because the fault point current is very small, so judging fault line accurately becomes very difficult through fifth harmonic amplitude comparison . The method of fifth harmonics and the combination of wavelet packet energy are presented. Use wavelet packet to do three layer wavelet packet decomposition on five harmonic of zero sequence current of each line , then calculate the total energy on the third floor reconstruction coefficient. By comparing the fifth harmonic energy of the zero sequence currents ,the fault line can be judged.By setting up 10 kV neutrall point via arc suppression coil grounding current of single phase short circuit grounding system simulation model, the results show that the method of fifth harmonics and combination of wavelet packet energy can accurately select fault line .
