摘要
在我国的配电网中,广泛采用中性点非直接接地系统(也称小电流接地系统)。此类系统发生最多的是单相接地故障,如何快速准确地检测出故障区段一直是电力系统继电保护的重要课题之一。通过对中性点非直接接地系统线路发生单相接地故障的定性分析,提出了一种基于零序电流的故障区段定位方法,该方法利用故障线路与非故障线路的零序电流差异性进行故障区段定位。仿真结果表明,该方法灵敏度高、计算简单,不受过渡电阻和线路长度的影响。
Neutral indirectly grounding system （small current grounding system） is widely used in distribution system in China. In this power system, the single phase-to-ground fault occurs most frequently, so how to detect the fault section quickly and accurately is one of important subject in the protective relaying of the power system. By the qualitative analysis of single phase-to-earth fault in neutral point indirectly grounding system, the paper proposes a method for fault section location based on zero sequence current, which makes use of the differences of the zero sequence current between fault line and non-fault line to locate the fault section. The simulation results show that this method has a good prospect of application for its high sensitivity, simple calculation, and no influence by transition resistance and line length.
出处
《陕西电力》
2012年第12期47-50,67,共5页
Shanxi Electric Power
关键词
小电流接地系统
单相接地故障
零序电流
故障区段定位
small current grounding system
single phase-to-ground fault
zero sequence current
fault section location
