农村配电网间歇性电弧接地故障选线研究

Study on Selecting Intermittent Arc-grounding Fault Feeder in Rural Power Distribution Network

在我国农村配电网中,由短时性的电弧和不稳定的间歇性电弧等引起的非永久性单相接地故障时有发生,故障后的选线问题是学者们研究的焦点。利用发生电弧故障时带来的大量高频电弧所引起的奇异特征,用小波奇异性检测原理对发生间歇性电弧接地故障后的零序电流进行大量的仿真研究,在此基础上提出新的选线方法。使用Matlab/Simulink进行仿真后的结果表明:该选线方法在发生间歇性电弧故障时能正确地选出故障线路,其原理可靠、准确。

In China’s rural power distribution network,short-term arc-grounding and unstable intermittent arc-grounding faults（single phase-to-ground faults） are most likely to occur in the power system.Fault line selection has been a research focus for many scholars.As many high frequency components will be produced correspondingly when arc-grounding fault happens,a novel method is introduced in this paper according to the research results that are conducted from the research on the singular character of zero-sequence current with the time and frequency localization character of wavelet transform.The Matlab/Simulation results showed that the proposed method could find the fault feeder correctly when single phase intermittent arc-grounding fault occured.The principle is reliable and accurate.MoreBack AbstractFilter（＇EnChDivSummary＇,＇ChDivSummaryMore2＇,＇ChDivSummaryReset2＇）; 【Keywords in Chinese】 小电流接地系统; 间歇性电弧接地; 小波分析; 【Key words】 neutral non-effectively grounded distribution system; intermittency arc-grounding fault; wavelet transform;