应用短时傅里叶变换识别串联电弧故障特征的研究

介绍了电弧故障保护电器在电气火灾防护中的作用以及电弧故障检测现状。通过短时傅里叶变换,分析了多种负载串联电弧故障特征频段,提出了一种串联电弧故障识别的方法。串联电弧故障波形分析表明,短时傅里叶变换为串联电弧故障特征的提取提供了可靠依据,在此基础上采用的统计分析可准确识别串联电弧故障,并有效区分负载起动冲击电流的干扰。

Research of STFT Application in Series Arc Fault Feature Recognition

The function of arc fault protection devices in electrical fire protection was introduced,as well as arc fault detection status. Series arc fault characteristic frequency band of several loads was analyzed according to STFT,based on which a method was proposed to extract and distinguish series arc fault. The series arc fault waveform analysis shows that STFT,a time-frequency analysis method provides reliable basis for the characteristic extraction of series arc fault,based on which statistical techniques were used to identify the series arc fault characteristics correctly,and discriminate effectively the inrush starting current interference of loads.