基于行波检测的水电配电网单相接地故障定位  

Single-phase Ground Fault Location of Hydropower Distribution Network Based on Traveling Wave Detection

作　　者：王哲[1] 迟福建 赵志斌[2] 孙阔 WANG Zhe;CHI Fujian;ZHAO Zhibin;SUN Kuo(State Grid Tianjin Electric Power Company,Tianjin 300000,China;School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国网天津市电力公司,天津300000 [2]华北电力大学电气与电子工程学院,北京102206

出　　处：《电气传动》2021年第16期46-50,共5页Electric Drive

基　　金：国网天津市电力公司管理咨询项目(KH19010279)。

摘　　要：对单相接地故障进行精准定位有利于提高水电配电网供电质量、减少断电造成的损失。为此,针对传统定位方法存在的定位误差大、检测耗时长的问题,设计了基于行波检测的水电配电网单相接地故障定位方法。定位过程共分为两个阶段:一是水电配电网单相接地故障选线,确定发生故障的线路。二是针对行波信号中存在噪声的特性,将行波检测法中的双端法与二进小波变换过程相结合,借助于二进小波变换的消噪作用和异常点定位能力,对单相接地故障位置进行精确定位。实证结果表明:与传统定位方法相比,利用行波检测方法后的定位误差更小、故障检测时间更短,为水电配电网单相接地故障的及时修复奠定了重要的基础。Accurate positioning of single-phase ground fault can improve the power supply quality of hydropower distribution network and reduce the loss caused by power failure.Therefore,in view of the problems of large positioning error and long detection time in traditional positioning methods,a single-phase ground fault positioning method for hydropower distribution network based on traveling wave detection was designed.The positioning process was divided into two stages:first,the single-phase grounding fault of the hydropower distribution network was selected and the fault line was determined.Second,in view of the characteristics of the noise in traveling wave signal,the double-end method in traveling wave detection method was combined with the process of binary wavelet transform.By virtue of the denoising effect of binary wavelet transform and the locating ability of abnormal points,the single-phase ground fault location was accurately located.The empirical results show that:compared with the traditional positioning method,the positioning error is smaller and the fault detection time is shorter after using the traveling wave detection method,which lays an important foundation for the timely repair of single-phase ground fault in the hydropower distribution network.

关 键 词：行波检测 水电配电网 单相接地故障 故障定位 行波选线 双端法 二进小波变换 

分 类 号：TM125[电气工程—电工理论与新技术]