小波包分析在超高频检测GIS局部放电中的应用

The Application of Wavelet Packet Analysis in GIS PD UHF Detection

超高频法是检测GIS局部放电的有效方法,本文通过对GIS中典型缺陷超高频信号的小波包分析,对其频率分布特性进行了研究。利用小波包分解,构建了超高频信号的"能量-频率"模式特征。研究结果表明,不同缺陷的超高频信号具有不同的"能量-频率"特征,在现场进行检测时,应通过比较放电能量特征值,选择最佳频段进行检测。

Ultra high frequency （UHF） is an effective method in detecting the partial discharge （PD） in gas insulation substation （GIS）. The frequency characteristics of typical defect PD signal were studied through wavelet packet analysis （WPA）. The ＂energy -frequency＂ mode was build through WPT. The results of the study showed that the UHF signal with different defects had different ＂energy - frequency＂ mode. The best detection frequency width could be selected by comparison of the ＂energy - frequency＂ characteristic value.