树形配电线路单相接地故障测距新算法

New algorithm for location of single-line-to-ground fault on radial distribution network

针对树形配电线路特点 ,建立单相接地故障的分布参数电路模型 ,于故障后利用线路起始端的电压相量和电流相量 ,提出了一种树形配电线路单相接地故障测距的新算法 .本算法利用树形线路的层次化拓扑结构描述方法 ,将始端相量逐分支向后传递 ,故障点逐分支搜索的方法实现故障分支的识别和故障点的定位 ,利用多频诊断法实现真伪故障的识别 .

Based on a distributed parameter circuit model constructed according to the characteristics of the radial distribution network,a new algorithm for location of single line to ground fault is presented. The post fault voltage and current phasors at inital end are utilized in the algorithm. The framework of data processing for layers of network is used and the phasors at initial end transmit branch by branch,not only fault branch indentification but also location of fault is completed. By double frequency diagnosis, true fault and false fault identification is completed. It has been confirmed by a lot of fault diagnosis simulations by computer and experiments on fault simulated lines.