摘要
提出了一种新的波形分析法用于直流系统接地故障检测,该法通过向直流系统注入低频方波信号,分析方波信号基波及三次谐波之间的相位及幅值关系,检测流过支路的对地电阻电流,计算接地电阻,确定接地支路和接地点。详细分析了波形分析法的工作原理,并提出检测判据,最后通过试验证实了文中方法的正确性。
A new method of waveform analysis for detecting earth fault in a DC system is proposed. By injecting a low frequency square wave signal to the DC system and analyzing the relationship of phase and amplitude between the fundamental and the third harmonic components, the insulation reduction of branch and locus is detected. This paper discusses the principle of waveform analysis method in details and presents the detecting criterion. Experimental tests verify the correctness and feasibility of the proposed method.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第22期69-72,共4页
Automation of Electric Power Systems
关键词
波形分析
直流系统
接地故障检测
检测判据
waveform analysis
DC system
earth fault detection
detecting criterion
