小波分析在小电流接地系统故障选线中的应用

THE APPLICATION OF WAVELET TRANSFORM IN FINDING FAULT FEEDER OF EARTH FAULT IN RESONANT GROUNDED SYSTEM

提出一种比较各条线路的暂态零序电流高频分量进行故障选线的方法。对不同的小电流接地系统 ,选用由Prony方法计算出的高频分量频率 ,从而更有效地利用暂态电气量。应用在时频空间具有良好聚焦特性的小波包 ,以适当频带宽度 ,对故障后暂态量进行分解。仿真结果表明 ,该选线方法故障特征明显 。

This paper introduced a method of finding the fault feeder by contrasting transient zero sequence currents.For different Petersen coil protected power networks using high frequency calculated by Prony method would take advantage of the transient signals more effectively.Wavelet package is used to decompose this transient signals with appreciate frequency width.The results simulated by EMTP show that this method can find the fault feeder accurately.