一种实用的馈线单相接地故障区段定位与隔离方法

Practical Method of Locating and Isolation for Single Phase Grounding Fault Section of Feeders in Distribution Networks

为解决小电流接地系统单相接地故障定位困难的问题,介绍了一种在电压时间型馈线自动化系统中基于零序电压检测的馈线单相接地故障区段定位与隔离方法,阐述了该方法的工作原理和馈线终端单元(FTU)的运行方式。以中山市某区环网型线路馈线自动化系统工程为例,论述了基于该方法的单相接地故障区段定位与隔离的过程分析,验证了该方法的可行性和实用性。

In order to solve the problem of single phase grounding fault locating in non-effectively grounding networks, a zerosequence voltage based practical method of locating and isolating for single phase grounding fault section is proposed in this paper, which operates on the feeder automation system of Voltage-time type, The main principle about this method is given and the operating mode of feeder terminal unit （FTU） is also discussed. At last, combined with the project of a Zhongshan loopfeeder automation system, the analysis about fault insulating process is described in detail. It is demonstrated that the method proposed is feasible and practical.