Recently, diagnostic techniques have been investigated to detect a partial discharge (PD) associated with a dielectric material defect in a high-voltage electrical apparatus. However, the properties of PD aren't completely understood because the physical process of PD is complicated. For improvement of detection techniques of PD, it is important to make clear the fundamental physical process of PD. Therefore, this paper analyzes the process of PD using Wavelet transform. Wavelet transform provides a direct quantitative measure of spectral content (Dynamic spectrum) in the time-frequency domain.
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