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and the structures of four types of PD are shown in left Figure . The signal collected by the oscilloscope is shown in right Figure. It can be seen from the figure that the noise has a great influence. In order to reduce the noise influence, the wavelet transform is used. Wavelet transform is an effective transform analysis method, which can refine the high frequency and low frequency of the signal through the expansion and translation operation. The Daubechies5 wavelet with orthogonality and tight support is used here. As a sparse base, this wavelet is not easy to produce large smoothing errors, that is, the reconstructed signal is smoother.
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IEEE/ICACT20220141 Slide.05
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