基于二进小波变换的超高压输电线路单相接地故障定位  

Single⁃phase ground fault location for EHV transmission lines based on dyadic wavelet transform

作　　者：郑武略 张富春[1] 李伟性[1] 卢涛 ZHENG Wulue;ZHANG Fuchun;LI Weixing;LU Tao(Guangzhou Bureau of China Southern Power Grid EHV Transmission Corporation,Guangzhou 510000,China)

机构地区：[1]中国南方电网超高压输电公司广州局,广东广州510000

出　　处：《电子设计工程》2021年第8期115-118,123,共5页Electronic Design Engineering

基　　金：广东省中国南方电网有限责任公司超高压输电公司2018年第二批科技项目(000220000003931)。

摘　　要：现有的输电线路单相接地故障定位方法定位速度慢、故障点位置相对误差较高,为此,面向超高压输电线路,基于二进小波变换提出了一种新的单相接地故障定位方法。通过超高压输电线路的最简网络得到故障点处各相的对地电压,从而分析超高压输电线路单相接地故障特征。在此基础上,利用二进小波变换法定位单相接地故障位置,即根据小波变换结果提供的时频窗确定故障位置。实验结果表明,上述单相接地故障定位方法能够有效提高定位收敛速度,且能够降低故障点定位结果的相对误差。The existing single⁃phase ground fault location methods for transmission lines have slow locating speed and relatively high fault location error.Therefore,a new single⁃phase ground fault location method based on binary wavelet transform is proposed for ultra high voltage transmission lines.The grounding voltage of each phase at the fault point is obtained through the simplest network of EHV transmission lines,and then the fault characteristics of single phase grounding of EHV transmission lines are analyzed.On this basis,the fault location is determined by using the time⁃frequency window provided by the wavelet transform.The experimental results show that the above method can effectively improve the convergence rate and reduce the relative error of fault location results.

关 键 词：二进小波变换 超高压输电线路 单相接地故障 故障定位 时频窗 

分 类 号：TM81[电气工程—高电压与绝缘技术]