注入法选线在小电流接地系统中的应用研究

Study of the signal injection method in indirectly earthed power system

注入信号法是一种效果较好的选线方法,其原理广泛应用于小电流接地系统单相接地故障的自动选线。在现场运行中,由于外部环境因素的变化,有时会发生选线错误、漏判等现象。通过对注入法机理的深入分析,借助Matlab软件仿真研究,给出了注入法正确使用的外部条件。

The signal injection method is widely used for automatic selecting fault line in indirectly earthed power system, which has great effect in the system of single-phase ground fault. Because external surrounding factors changed, sometimes mistakes would occur in local circumstance, such as misjudgment, not judging, etc. According to analyzing the method principle in detail by Matlab simulation, this paper points out the correct exterior conditions by using the method.