本文通过对现有10kV自闭线路单相接地故障检测方法的调查、分析,提出了10kV自闭线单相接地故障检测判据,并从理论上加以分析、说明。同时根据本文提出的判据,运用交流采样、数字信号处理器（DSP）、GPS、铁路电力运动系统等先进技术,设计出10kV自闭线路故障自动检测及切除系统。实现快速隔离故障,缩短故障查找时间,确保10kV自闭电网正常供电。 Based on the investigation and analysis of the existing 10kV self-closing line single-phase ground fault detection method, the 10kV self-closing single-phase ground fault detection criterion is proposed and analyzed theoretically. At the same time, according to the criteria proposed in this paper, the system of automatic fault detection and removal of 10kV self-closing circuit is designed by using advanced technologies such as AC sampling, digital signal processor (DSP), GPS and railway power movement system. Fast isolation failure, shorten troubleshooting time and ensure normal power supply of 10kV self-closing grid.