Denoising of UHF partial discharge signal by complex wavelet transform for power transformer
A denoising method based on CWT (Complex Wavelet Transform) is presented for power transformer on - line UHF PD monitoring system. The 3 - step denoising algorithm is discussed. The optimal selections of complex mother wavelet,as well as the determination of CWT decomposition level and their threshold algorithm, are emphasized. Different threshold algorithms are applied to different noises:the penalized and SURE threshold algorithms can catch the tiny information merged in noise,while the universal and heuristic SURE threshold algorithms can get rid of noise effectively. The steps and methods of on - line UHF PD signal denoising are introduced. Results show that the proposed method is an effective optimal denoising method for power transformer UHF PD signals.
ultra high frequencypartial dischargenoisecomplex wavelet transformdenoising algorithm
NETL
NSTL
万方数据
维普
