基于时域波形比较法的故障电弧检测算法研究

摘要

A time-domain waveform comparison algorithm is introduced in this paper to detect breakdown electric arc. The algorithm utilizes the distortion features of current waveforms when arc faults occur. The potential arc fault current waveform is compared with a normal current waveform by means of this algorithm and both the waveforms are accumulated within a period of errors. Then the diversity factor between the two waveforms is achieved by normalizing the error accumulation. Finally the algorithm determines whether an arc fault happens according to the diversity factor. The paper performs experiments by using fluorescent lamps, halogen lamps and hand drills as screening loads. The results shows that the proposed method achieves better detection performance than the algorithm of adjacent waveform comparison.%本文根据故障电弧发生时，时域电流波形将发生畸变的特征，提出一种时域波形比较算法，来检测故障电弧。该方法采用正常的电流波形与可能的故障电弧电流波形进行比较，计算两波形在一个周期内的误差累积，再通过归一化得出两个波形差异度，通过差异度来判定是否发生故障电弧。以日光灯、手持电钻、卤素灯为屏蔽负载的实验表明，该算法比两个相邻波形比较法具有更明显的效果。