赵肖雪,宋吉江,杨建平,陈平,辛正祥,刘韩奇.基于小波包和包络线的行波相关法单端故障测距研究[J].电测与仪表,2018,55(15):98-103. ZHAO Xiaoxue,SONG Jijiang,YANG Jianping,CHEN Ping,XIN Zhengxiang,LIU Hanqi.Traveling wave correlation method for single terminal fault location based on wavelet packet and envelope[J].Electrical Measurement & Instrumentation,2018,55(15):98-103.
基于小波包和包络线的行波相关法单端故障测距研究
Traveling wave correlation method for single terminal fault location based on wavelet packet and envelope
Aiming at the time window of traveling wave correlation method is not fixed, and the reliability of single-ended traveling wave fault location is low, a new method combining wavelet packet with envelope is proposed. Firstly, the wavelet packet decomposition and reconstruction of the fault traveling wave signal are carried out by using the db1 wavelet basis, and the width of the initial wave head of the forward and backward traveling waves is the same at different scales. The width of the initial wave head of the forward and backward traveling wave is used as the time window width in the traveling wave correlation method, so that the time window width becomes a fixed value. Secondly, the first two poles of the forward and backward traveling waves are converted into unipolar wave head by using the envelope. Finally, the single ended traveling wave fault location is realized by the related algorithm. The proposed method makes the time window width in the traveling wave correlation method no longer affected by the fault distance and transition resistance, and the forward and backward waves after the envelope processing avoid the excess extremum of the correlation function. Compared with the traditional traveling wave correlation method, this method can obviously improve the reliability of single ended fault location by PSCAD and MATLAB simulation analysis.
