TIME-FREQUENCY ANALYSIS OF ACOUSTIC EMISSION PULSES GENERATED BY PARTIAL DISCHARGES

Tomasz Boczar

   The subject matter of this paper refers to the improvement of the acoustic emission (AE)method when used for detection, measurement and location of partial discharges (PDs) in oil insulation systems of power appliances. The detailed subject matter refers to the issues connected with the application of modern methods of digital processing of signals obtained during technical high-power measurements. The paper presents the results of measurements and time-frequency analyses of the AE pulses of PDs in oil in the multipoint-plane system. The AE pulses measured were subject to the discrete and continuous wavelet transform and the STFT (Short Time Fourier Transform) analysis.

Keywords: acoustic emission (AE), partial discharges (PDs), STFT (Short Time Fourier Transform), discrete wavelet transform (DWT), continuous wavelet transform (CWT)

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