小波变换奇异性在电力系统行波故障测距中的应用

输电线路行波双端故障测距具有很高的精度 ,但需要高速A/D采集、大量的数据存储、复杂的行波波头辨识 ,对近距离故障测量存在困难。提出利用小波变换的时频分析特性 ,结合行波传输的特点 ,对行波信号利用小波变换提取故障时行波的故障信息。利用GPS作为同步时钟 ,测量波头到达测量端的时刻 ,构成输电线路的行波测量网络 ,通过调度通信进行故障测距 ,可以提高测距的可靠性和精度

The Fault Location for Power System Traveling Wave With Wavelet Transform

The double end fault location for transmission lines with high precision requires data collection with high speed A/D element,data storage in large quantities and complex identification of the traveling wave crest,so it is difficult to measure a fault in a short distance.This paper shows that the information of fault in the traveling wave signal can be found by the time frequency analysis characteristics of the wavelet transform and the characteristics of the traveling wave transmission.The time that wave crest reaches the measured end can be measured by using GPS as a synchronized clock.A network for measuring traveling wave can be formed through dispatch and communications to improve reliability and precision of the fault location.