行波小波分析法对单相接地故障选线方法的研究

Research on the Phase Earth Fault Feeder Detection by Travelling Wave and Wavelets

论述了配电网中单相接地短路故障行波的特性,运用小波变换分析中性点非直接接地配电网中单相接地故障行波信号。导出了一种利用暂态行波0模量的小波系数的极大值极性识别故障线路的故障选线新方法。并证明了在故障初始行波过程中,故障点间歇电弧及过渡电阻对本方法的影响十分微弱。通过大量仿真试验,证明本方法的正确性、有效性和通用性。

In the paper the characteristic of single phase fault traveling waves in distribution grid is discussed ,wavelets have been presented to analyze single phase fault traveling wave signals in an ineffectively grounded distribution grid. A novel earth failure detection technique that distinguishes the fault feeder by the wavelets coefficient maximum polarity of the traveling wave zero mode is introduced. In the primary process the influences of fault intermittent arc, transformer and its neutral point are proved be feeble. The exactness, availability and universality of the technique are proved by a great deal of simulating test.