暂态初始行波相位比较法接地故障选线研究  

A study of earth fault detection by comparing phase of initial transient traveling wave

作　　者：黄悦华[1] 王永辉[1] 

机构地区：[1]三峡大学电气信息学院,湖北宜昌443002

出　　处：《中国电力》2008年第4期11-14,共4页Electric Power

基　　金：湖北省自然科学基金资助项目(2006ABA202);湖北省教育厅科学研究资助项目(Q200613004)

摘　　要：分析了非有效接地电网中单相接地短路故障行波的特性,运用复频B样条小波(CFBSP)分析了故障初始过程中奇异的行波0模信号,得出此时故障线路电流行波0模量的小波系数的极大值极性及相位与其他线路正好相反的结论。在适当的小波尺度下,比较各线路故障初始过程中电流行波0模量的小波系数的极大值极性及相位,就能够识别出单相接地的故障线路,完成故障选线。并证明了故障点间歇电弧、过渡电阻、变压器的接线方式及其中性点接地方式对本方法的影响很小。通过仿真试验,证明了方法的正确性、有效性和通用性。The characteristic of traveling waves produced by a single-phase earth fault in an ineffectively grounded distribution grid was discussed. A complex frequency B-spline （CFBSP） wavelet was presented to analyze the singular signals of the zero modes of the fault traveling waves in the initial process of the failure, and the wavelets coefficient maximum polarity and phase angle of the zero mode of the fault feeder traveling wave current are right the inverse of the others. A novel earth failure detection technique was introduced to distinguish the fault feeder by comparing the wavelets coefficients maximum polarity and phase-angle of the zero modes of the traveling waves＇ currents in some scales. The influences of the fault spot intermittent arc, transformer and its neutral point were proved to be feeble. The detection technique is verv exact, available and universal, which is proved by a great deal of simulating test.

关 键 词：B样条小波 故障选线 极大值极性 消弧线圈 行波 

分 类 号：TM86[电气工程—高电压与绝缘技术]