基于电弧电流高频分量的串联交流电弧故障检测方法

Series AC arc fault detection based on high-frequency components of arc current

通过分析典型负载下电弧电流高频分量在时域与频域表现出的不同特征,提出一种串联交流电弧故障检测方法。该方法利用电弧电流变化率与其有效值的比值以及6~12k Hz频段电流幅值这2个特征参量进行串联交流电弧故障识别;并利用负载启动电流持续时间远远小于电弧电流持续时间的特点,设定电弧故障检测时间阈值,降低负载启动过程对串联交流电弧故障检测的影响。试验结果表明,所提方法能够实现串联交流电弧故障的快速检测,对硬件要求相对较低,简便易行。

The performance of high-frequency components of arc current with typical load in time domain is quite different from that in frequency domain,based on which,a detection method is proposed for series AC arc fault. The ratio of arc current variation rate to its RMS and the current amplitude of 6 kHz ～12 kHz band are used as the characteristic parameters to identify the series AC arc fault. Since the duration of load startup current is far shorter than that of arc current,the time threshold of arc fault is set accordingly to reduce the influence of load startup process on the arc fault detection. Test results show that the proposed method can easily realize the rapid detection of series AC arc fault with simple hardware.