非直接接地系统单相接地故障选线方法综述

Survey of the methods to select single-phase fault line in neutral point indirectly grounded power system

在我国3～66kV配电网中,广泛采用非直接接地系统,也就是小电流接地系统。而此类系统发生最多的是单相接地故障,如何快速准确地检测出故障线路一直是电力系统继电保护的重要研究课题。本文回顾了小电流接地系统单相接地故障选线方法发展的历史,对现有的各种选线原理和方法做了系统归纳和比较,并给出了几点结论。

Neutral point indirectly grounded power system is widely used in 3～66 kV power distribution system in China. In this power system, the single-phase-to earth fault occurs most frequently in distribution, so how to detect the fault line quickly and accurately is an important subject in protective relaying of power system. Reviewing the history of the methods to select the fault line in neutral point indirectly grounded power system, this paper summarizes all the existing theories of fault line selection and gives the conclusions. This project is supported by National Natural Science Foundation of Tianjin(No.033601511)