基于小波变换提取局部放电脉冲特征的影响因素分析

Extraction of Partial Discharge Pulse Using Wavelet Transform

针对局部放电测量中存在的缓变窄带噪声，采用小波变换技术来提取局部放电脉冲．通过计算机模拟，着重分析了基于小波变换提取局部放电脉冲特征的各种影响因素，并在此基础上研究了用小波变换方法提取现场测试局部放电脉冲信号．研究结果表明：利用小波变换能有效地从窄带噪声中提取局部放电脉冲的特征．

Multiresolution of wavelet transform is applied in this paper for extracting partial discharge (PD) pulses from narrow band radio frequency noises. Through the numerical simulating experiment, different influencing factors in feature extraction of PD pulses by using wavelet transform are analyzed in detail. On the base of the above research, on site PD measurements are made to supplement the numerical simulation such that various factors affecting the results are identified. The research results show that wavelet transform can be used to extracting the PD pulses from the strong noises.