一种低压电弧故障检测的新方法①

摘要

利用二进小波变换法分解低压配电线路电弧故障时的电流波形，获得电流波形各尺度小波变换的高频系数。电弧故障时的电流波形小波变换高频系数与负载正常启动和运行状态时相比，有其明显的特征，可有效地应用于电弧故障检测。利用LabVIEW和MATLAB软件平台实现了电流在线采集和分析，实验结果表明该方法能准确地辨识低压配电线路中的电弧故障。%Current of arcing fault in the low-voltage distribution lines is decomposed by dyadic wavelet transform in this paper, and each scale high-frequency coefficients of wavelet transform of the current waveform are gotten. Compared with the load normal starting and running state, the high-frequency coefficients have obvious characteristic when the arcing fault occurs. Effectively, the characteristic can be applied to the arcing fault detector. Based on the method, current is collected online and analysed by LabVIEW and MATLAB software platform. The result of experiment shows that the method can accurately identify the arc fault on low-voltage distribution lines.