基于小波理论的暂态量故障选线研究

Research on Faulted Feeder Identification of Transient Information Based on Wavelet Theory

针对中性点经消弧线圈接地系统,目前研究的各种选线方法测量误差较大、选线正确率低等缺点,本文提出基于小波理论的暂态量故障选线方法,该算法可以直接利用各线路的暂态零序电流进行故障选线,计算量很小。并通过仿真实验,证明了本文提出的新算法在各种故障模式下可以准确地实现接地故障选线,适用于包括中性点经消弧线圈接地的各种小电流接地系统。

For the system of the neutral ground via arc-suppression coil,various current methods of faulted feeder identification have some shortcomings such as greater measurement errors,low accuracy and so on.This paper put forward the research on faulted feeder identification of transient information based on wavelet theory.The algorithm can directly use the transient zero-sequence current of all feeders to identify faulted feeder,and the calculation is very small.Simulation experiment proved that the new algorithm advanced in this paper can achieve accurately grounding faulted feeder identification in various fault modes.It is applicable to various small current grounding systems including the neutral grounding via arc-suppression coil system.