基于负载端电压分析的串联故障电弧检测方法

Series Arc Fault Detection Method Based on the Analysis of Load Voltage

基于串联故障电弧试验平台,对多类型负载进行试验并采集故障电弧电压电流信号,分析了以电弧电流波形为基础的故障电弧检测方法的局限性。串联故障电弧的产生导致负载端电压发生变化,研究了负载端电压特性,提出了基于负载端电压波形差均值的串联故障电弧检测方法。该方法将电压波形相邻周期做差,对差值波形进行小波去噪处理,利用电压波形差均值作为电弧检测特征量进行故障检测。经过试验分析,该方法能有效检测出串联故障电弧,结合电弧电流信号检测方法使用可以提高故障电弧检测的可靠性。

Based on the arc fa u lt experim ent platform and m u lti-ty p e load te s ts , the arc fa u lt voltage andcurrent signals were acquired and the lim in a tio n o f arc fa u lt detection based on current wavelet was analysed.The load voltage changes when the series arc fa u lt happens. Th is a rticle studied the load voltage characteristics andproposed a m ethod o f series arc fa u lt detection based on the mean difference o f the load voltage waveform . Inth is m e th o d ,th e subtraction o f the two adjacent cycle is acquired f ir s tly , then wavelet de-noises the subtractedw aveform , in the e n d , the mean difference o f the resulted voltage waveform is used as the cha racte ristic value fo r thearc detection. Through experim ental a n a lysis, the proposed m ethod can e ffe ctive ly detect the series arc fa u lt, andwhen com bined w ith the m ethod o f arc current d e te c tio n , it can obviously im prove the re lia b ility o f the arc fa u ltdetection.