基于相电流突变量的配电网单相接地故障区段定位  

Single-phase Earth Fault Section Location Based on Phase Current Fault Component in Distribution Network

作　　者：宋国兵[1] 李广[1] 于叶云 蔡新雷[1] 索南加乐[1] 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]炮兵学院南京分院数学教研室,江苏省南京市211132

出　　处：《电力系统自动化》2011年第21期84-90,共7页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51037005)~~

摘　　要：配电网在单相接地故障后,对健全线路及故障线路上故障点之后的部分,三相电流突变量大小相等、波形一致;而故障线路中故障点之前的部分不具有该特征。据此提出一种基于相电流突变量的配电网单相接地故障区段定位方法:在各线路出口及分支处安装接地故障检测装置,独立测量比较各相电流突变量,即可识别出故障区段,结合网络拓扑即可实现故障区段定位。给出了具体的故障定位流程和判据。仿真实验证明了该方法能正确、可靠地识别故障区段。所述方法原理简单,仅需测量电流,且具有自举性,有望应用于实际配电网中。Analysis shows that when single-phase earth fault occurs in a distribution network,three-phase current fault components of a healthy line and that of fault line after the fault point have same size and waveform,but that of fault line before the fault point doesn＇t have this characteristic.A single-phase earth fault section location method in the distribution network based on phase current fault component is proposed,namely,earth fault detection devices are installed at exits and branches of every line,and each device independently measures and compares current fault components so as to identify the fault section.Then fault section location is implemented with the network topology.Specific fault location flow chart and criterions are also given.Simulation results show that this method can identify fault section correctly and reliably.In addition,this method has a simple operation principle,only needs to measure currents.It has a bootstrap characteristic,and is expected to be used in practical distribution network. This work is supported by National Natural Science Foundation of China（No.51037005）.

关 键 词：配电网 单相接地故障 故障区段定位 相电流突变量 相关系数 

分 类 号：TM711[电气工程—电力系统及自动化]