利用CVT二次信号的频域行波故障测距方法  

Frequency Domain Traveling Wave Fault Location Method Using CVT's Secondary Signals

作　　者：邬林勇[1] 何正友[1] 钱清泉[1] 

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031

出　　处：《电力系统自动化》2008年第8期73-77,82,共6页Automation of Electric Power Systems

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-06-0799);四川省杰出青年基金资助项目(06ZQ026-012)~~

摘　　要：当输入信号为电容式电压互感器(CVT)二次信号时,现有的时域行波故障测距方法的计算结果不准确。提出从频域上进行故障距离计算的解决方法,分析了CVT的暂态响应特性及其对故障行波频谱的影响,推导了采用故障行波频率主成分计算故障距离的公式。对单相高阻接地故障下的行波频谱进行了专门讨论,并研究了利用多信号分类(MUSIC)算法等谱估计方法精确提取频率主成分的可行性。The currently used time-domain traveling wave fault location methods give inaccurate results when using the secondary signals of coupled capacitive voltage transformer （CVT） as input. A solution is presented in which the fault distance is calculated on the frequency domain. The CVT＇s transient response and its influence on the traveling wave frequency spectrum are analyzed. The formula for making distance calculation based on the main component of the traveling wave spectra is derived. In particular, the frequency spectra of the traveling wave induced by the high-resistance grounded fault are discussed, followed by a study of the feasibility of using such frequency estimation methods as the multiple signal classification （MUSIC） algorithm to extract the main frequency component.

关 键 词：故障测距 频谱 多信号分类(MUSIC)算法 行波 电容式电压互感器(CVT) 

分 类 号：TM726.1[电气工程—电力系统及自动化]