基于故障指示器的单相接地故障区段定位方法的研究

Research on the Method for Locating Single-phase GroundingFault Segment Based on Fault Indicator

针对小电流接地系统中单相接地故障定位困难的问题,首先对基于故障指示器的配电网自动化系统进行了介绍,以故障线路各故障指示器处的零序电流能量作为特征量,结合故障的矩阵算法,判断出发生故障的区间,使故障的人工探索范围更小。仿真结果显示,故障指示器结合零序电流能量和矩阵算法可准确找到故障区段,且不受故障距离的影响。

Aiming at difficult single-phase grounding fault location in a small current grounding system,distribution network automation system based on the fault indicator was introduced.Taking zero-sequence current energy at each fault indicator of the faulty line as characteristic quantity,the fault section was judged according to the fault matrix algorithm,so that the range of manual fault search might become smaller.Simulation results showed that the fault indicator,combined with zero-sequence current energy and matrix algorithm,could accurately find the fault section,and the proposed method was not affected by fault distance.