摘要： 检测供配电线路栓接电缆接头松动故障对于预防电气火灾具有重要意义。为此,提出一种基于Wigner-Hough变换(WHT)的松动故障检测方法。利用Wigner-Ville分布对接触电流进行变换,使其具有时频联合特征。通过Hough变换提取时频分布中的特征信息,并求取变换峰值及峰值变化率区间长度。根据不同实验条件下WHT峰值存在明显差异的特点识别松动故障,同时利用峰值变化率区间长度表征松动程度。实验结果表明,该方法能够有效检测配电线路电缆接头松动故障。

关键词: 松动故障, Wigner-Ville分布, 时频分布, Hough变换, Wigner-Hough变换, 峰值变化率

Abstract: It’s of great significance to detect the looseness fault of the bolted cable joint in power supply and distribution system for the prevention of electrical fire.Therefore,a looseness fault detection method based on Wigner-Hough Transform(WHT) is proposed.The pick-up current is transformed by Wigner-Ville Distribution(WVD) to obtain its time-frequency characteristics.The feature information is extracted by Hough transform and both the peak value and the interval length of peak value change rate are calculated.There are significant differences among those WHT peak values under different experimental conditions,so the WHT value can be used to identify the looseness fault,and the interval length of peak value change rate can be used to reveal the looseness degree.Experimental results show that this method can detect the looseness fault of bolted cable joint effectively.

Key words: looseness fault, Wigner-Ville Distribution(WVD), time-frequency distribution, Hough transform, Wigner-Hough Transform(WHT), peak value change rate

中图分类号: 

• TP18