基于多端行波的配电网单相接地故障定位方法

配电网多为树形结构,分支多,单端定位或双端定位方法都很难准确定位故障。针对B型行波和配电网树形结构,提出了一种多端行波故障定位方法。该方法利用接地故障时刻产生的行波第1波头到达配电网线路各末端的时刻进行故障定位。利用行波故障定位基础理论,建立了多端行波故障定位的理论依据,考查了定位方案在配电网中的优越性。采用ATP仿真软件和MATLAB软件对该方案在配电网中遇到的各种情况进行了仿真分析。仿真结果表明,在配电网单相接地故障定位中,多端行波定位法只利用接地故障初期很短时间内的暂态行波信号,接地故障后期的故障发展情况对开始的暂态行波信号并无影响,所以运用多端行波定位法能够快速准确地找到故障点。

A Single-phase Earth Fault Location Method for Distribution Network Based on Multi-terminal Traveling Wave

As the actual distribution network with tree structure has many branches,it is very difficult to find the fault point using the fault location method based on the single-terminal or double-terminal traveling wave.For the type B traveling wave and the tree structure of the distribution network,a fault location method based on multi-terminal traveling wave is put forward.This method carries out fault location by using the time that the first traveling wave head generated during grounding fault takes to reach the ends of the power lines.According to the theory of fault location method based on multi-terminal traveling wave,the theoretical basis is established and the superiority of the location scheme in the distribution network is examined.The various factors in the distribution network scheme are analyzed by ATP simulation software and MATLAB software.The simulation results show that in distribution network phase-to-ground fault location,the location method based on multi-terminal traveling wave only uses the initial transient traveling wave signal within a very short time,while the fault development in the later stage of the grounding fault has no influence on the initial transient traveling signal.So the fault point can be quickly and accurately found by using multi-terminal traveling wave method.