摘要
注入信号法是广泛应用于小电流接地系统单相接地故障的选线方法,实际应用中由于接地故障电阻大,容易发生选线失败的现象。文章通过分析注入信号法的基本原理及注入信号的流通路径,借助Matlab仿真,研究了注入信号频率对选线效果的影响,得出了降低注入信号的频率可以减小非故障线路对信号电流的分流作用、提高注入法的适用范围和选线准确率的结论。
The signal injection method is widely used for selecting fault line in small-current grounded power system. Because of large fault earth resistance, some mistakes of selecting fault line would occur easily in practice. Based on the analysis of the basic principle and the circulating circuit of the injected signal method, simulation by Matlab, the paper studied the effect of frequency of injected signal on the result of selecting fault line. Then it concluded that decreasing the frequency of injected signal can reduce shunts of non-fault lines, improve application area and accurate rate of the method.
出处
《工矿自动化》
北大核心
2008年第5期37-39,共3页
Journal Of Mine Automation
关键词
小电流接地系统
故障选线
注入信号法
频率分析
仿真研究
small-current grounded power system, selecting fault line, signal injection method, frequency analysis, simulation research
