Abstract
Partial discharge (PD) can be used to study degradation processes of insulation by looking into the physics of the discharge process. This can be done by different means but a valuable technique, at least for the laboratory, is the use of ultra-wideband (UWB) PD detection systems. The UWB PD detection technique is introduced to measure the PD pulse wave of stator bar specimens during multi-stress aging tests. The data obtained are analyzed using joint time-frequency analysis (JTFA) methods, that is, short-time Fourier transform (STFT), discrete Wigner distribution (DWD) and discrete Gabor spectrogram (DGS), and finally Gabor spectrum is selected to analyze the characteristics of a single PD pulse wave. The results show that the UWB method can be used to measure a single PD pulse. The UWB PD pulse wave and its time-frequency spectrogram can indicate the degradation processes of the stator winding insulation in a large generator.
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