不受波速影响的电力线路故障双端行波定位方法

摘要

为了降低波速不确定导致的故障定位误差，提出一种不受波速影响的双端行波故障定位方法。该方法通过分析母线两端检测到的初始行波、故障点反射波、对端母线反射波的极性特征，记录初始行波、故障点反射波和对端母线反射波到达测量端的时间，仅利用双端反射波与初始行波的时间差计算故障点位置。该方法无需双端行波测量的时间同步，且定位计算与波速无关。仿真分析结果表明：该方法故障定位精度高，能够消除传统双端定位方法因时间不同步和波速不确定导致的故障定位误差等难题。%In order to solve the accuracy problem caused by travelling wave speed in the traditional power line fault location method with travelling wave,a novel fault location method with double-terminal traveling wave was presented in this paper,which can avoid the influence of wave trans-mission speed.The polarity characteristics were analyzed for initial traveling wave,reflected wave from fault point,reflected wave from opposite bus bar.And the fault position was obtained by comprehensively calculated the arriving times of initial traveling wave,reflected wave from fault point,reflected wave from opposite busbar.The influence of the wave transmission speed and time asynchronous is removed.Theoretical analysis and simulation results show the proposed method is with high precision,and can eliminate the errors caused by wave speed and time asynchronous.