基于故障电流信息综合分析的分布式单相接地故障测距方法

在分析输电线路故障电流特性的基础上,提出利用不同检测点故障电流零序分量之间的偏离度和故障电流行波的第一个波头能量综合判断故障区间的方法,分析了检测点在不同的安装位置时其检测到故障行波及其反射、折射波的对应关系,并提出分布式单相接地故障测距系统故障所需检测点的数量及安装位置的要求,最终根据故障区间,选择对应的测距方程,从而得到故障点位置.仿真实验表明此分布式故障测距方法测距精度较高.

A Distributed Fault Location Algorithm for Single-Phase Ground Fault by Comprehensive Analysis on Fault Current Information

On the basis of analyzing characteristic of fault current in overhead transmission line,a method to comprehensively judge the fault zone by utilizing deviation degree among zero-sequence components of the fault current measured at different detecting points and the energy of the first traveling wave of the fault current is proposed.Corresponding relationships among the measured traveling wave of the fault current and its reflected and refracted waves obtained by fault detector installed at different positions are analyzed,and the number of detecting points needed by the distributed fault location system for single-phase ground fault and the installation positions of detectors are put forward.Finally,according to the fault zone corresponding fault location equation is chosen to determine the position of fault point.Simulation results show that by use of the proposed fault location method a more accurate result of fault location can be attained.