基于分布式检测的多分支输电线路故障精确定位技术

摘要

In order to solve the problem of precise fault location on complex multi-branch transmission lines,this paper analyzes fault traveling wave process and its detection requirement.On this base,it designs a distributed traveling wave detecting unit suitable for installation on transmission lines,and presents a novel fault location method based on distributed detection for multi-branch transmission lines.For this method,time of arrival of fault initial traveling wave range at detection points is all needed for determination of the fault branch.Then,the fault position is preciously determined by double-end step-by-step recursion under consideration of installation positions of detection points.Theoretical analysis and simulation indicate that this distributed fault location technology can solve the problem of fault location for multi-branch transmission lines,realize real-time measurement of wave velocity during fault,eliminate errors caused by uncertainty of the traveling wave velocity and achieve high location accuracy.%为解决多分支复杂输电线路故障精确定位的难题,分析了故障行波过程及其检测要求.设计了适用于输电线路安装使用的分布式行波检测单元并提出针对多分支输电线路的基于分布式检测的故障定位新方法.只需要利用故障初始行波波头到达检测点的时间,根据初始行波波头到达各检测点的时间即可确定故障支路,再结合检测点的安装位置利用逐级递归双端法精确定位故障发生位置.理论和仿真表明,分布式故障定位技术很好地解决了多分支输电线路故障定位的问题,同时实现了故障时波速的实时测量,消除了波速不确定性带来的误差,定位精度高.