超高压线路单相接地故障类型的判别——稳态相角法

IDENTIFICATION THE TYPE OF SINGLE-PHASE-TO-GROUND FAULT IN EHV LINES

单相接地故障可分为“永久性”与“瞬时性”。本文分析了两种故障下断开相两端电压的相角差，对一个实际的系统进行了ＥＭＴＰ数值仿真，提出了识别两种故障的方法。

There are two types of single-phase-to ground faults in EHV lines, one is temporay, the other is permanent. The voltage angel of faulty phase was chosen to study,after the faulty phase was isolated from both terminals. Through the EMTP calculation, an example is used to explain how to find the way to identify the two types of single-phase-to-ground faults.