Comparisons of digital filter, matched filter and wavelet transform in PD detection
Chengke Zhou, Xiaobo Zhou, Brian G. Stewart, Alan Nesbitt, Donald M. Hepburn, Dongyan Guo, M. Michel · ResearchOnline · 2006
Analysis of Partial Discharge (PD) measurement is often hampered by electrical noise. To remove this noise it is necessary to apply sophisticated digital signal processing techniques. In the past, various digital filtering techniques based on the Fast Fourier Transform (FFT) were applied. However, their results have not been up to expectation. More recently, the recent application of the matched filters and the Wavelet Transform (WT) have shown great promise, in terms of the effectiveness of denoising and enhancing the SNR (signal-noise ratio).