小电流接地系统单相接地故障选线诸方法原理及利弊探讨

Discussion of Principles and Traits of Methods for a Single-phase Short Circuit to Ground Feeder Protection in Ineffectively Grounded Power Systems

我国的中压电网基本上都是小电流接地系统,单相接地故障率最高,因此如何检测并隔离接地故障线路,成为配电自动化的一个重要研究课题。就小电流接地系统发生单相接地故障的十余种故障选线方法分析了其原理及各自相应的特点,为小电流接地系统实现配电自动化提供了重要依据。

The coefficient of a single-phase short circuit to ground is very high in middle voltage power systems. How to detect and isolate earth-faulty section is an important subject to realize distribution automation in ineffectively grounded systems. The principles and traits of more than ten methods for faulty feeder protection when a single-phase short circuit to ground appears in such power systems are analyzed. This provides an important basis for distribution automation in ineffectively grounded systems.