小波系数峰值极性法的配电网单相接地故障选线保护

引入一种新的基于小波包分析的小接地系统单相接地短路故障选线方法:利用各线路及母线零序电流的小波包系数的峰值极性,构成新的故障选线保护判据,通过判断峰值极性特征完成故障选线工作。利用Matlab仿真了一个典型的中性点经消弧线圈接地的小系统,通过对仿真结果的分析和计算,证明了此方法的正确和有效。

Single-phase earth fault detetion by the wavelet coefficient peak polarties

A new single-phase earth fault detection technique based on wavelet packet analysis is introduced. Zero sequence currents wavelet packets coefficient peak polarities of all lines and bus line are used to form a new criterion. As the signs of fault detection, the fault detection is accomplished by comparing the wavelet packets coefficient peak polarities. A small typical Petersen coil grounded system is simulated in the paper. After analysing and computing the simulation results, the rightness and availability is proved.