小电流接地系统单相接地故障选线方法综述

摘要

在我国3～66kV配电网中，广泛采用小接地电流系统，而此系统发生最多的是单相接地故障，所以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。回顾了国内外小接地电流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案做了系统的归纳，提出了尚需解决的问题，并给出了分析的结论。%Networks with ungrounded neutral are widely used in power distribution system in China, and the single phase to earth fault happens most frequently in distribution, thus how to detect the fault line quickly and accurately is an important subject in electronic power system protective relaying. Firstly, this paper reviews the development history of the methods of fault line selection for single phase to earth fault in networks with ungrounded neutral in China and other countries. Secondly, it summarizes all the existing theories on the fault line selection systematically. Finally, it presents problems which should be solved in fault line selection and conclusions.