中文摘要：

提出一种基于馈线区段零序导纳的小电流接地故障定位新方法。分段开关将配电网各馈线分成若干区段,在分析健全区段与故障区段零序导纳特征的基础上,讨论了基于零序导纳的故障区段判据。该定位方法可利用馈线终端单元作为现场测量装置,借助配电自动化系统实现。数字仿真结果证明：该方法定位准确率高,不易受系统运行方式、线路参数和过渡电阻等因素影响,能满足现场实用要求。

英文摘要：

A novel location method for single phase-to-earth fault based on zero-sequence admittance of feeder section in non-effectively grounded system is presented.Each feeder of the distribution network is divided into several sections by the sectionalized switches.The criterion for faulty section based on zero-sequence admittance is discussed on the basis of analyzing zero-sequence admittance characteristics of sound section and faulty section.By using the feeder terminal unit（FTU） as field measurement equipment,this method for fault location can be implemented in distribution automation（DA） system.The results of digital simulation demonstrate that this method is immune to the variation of system operation mode,feeder parameter and transition resistance etc.,it has a high location accuracy and can meets the practical requirements.