Wavelet-based and fractal theory on partial discharge classification

In this paper, a novel 3-dimensional pattern of partial discharge (PD) was set-up based on the theory of wavelet analysis. The PD pattern could reflect the discharge characteristic. The parameters which characterize the PD were the frequency, the time and the energy. The fractal theory was adopted for the feature extraction and classification. The experiments have been carried out to validate the method with three kinds of artificial PD models. The results indicate that the proposed methodology has the recognizing and classifying ability for the PD types.