J. Bodzenta, M. Dzida and T. Pustelny
J. Phys. IV France 137 (2006) 35-41
The influence of the propagation path length on the results of the time-frequency analysis of the acoustic emission generated by partial discharges in insulation oilT. Boczar, S. Borucki, A. Cichon and M. Lorenc
Technical University of Opole, Faculty of Electrical Engineering and Automatics, Institute of Electric Power Engineering, ul. Sosnkowskiego 31, 45-272 Opole, Poland
(Published online 23 December 2006)
The paper presents the measurement results of the acoustic emission (AE) signals generated by partial discharges (PDs) at various thickness of the oil insulation layer. For the AE signals registered the time - frequency analysis was carried out based on the use of the short-time Fourier transform (STFT). Two- and three-dimensional spectrograms of the power spectrum density and the amplitude spectrum were determined. The evaluation of the influence of the propagation path length of the AE signal on the results of the time - frequency analysis was performed through the analysis of the spectrograms determined.
© EDP Sciences 2006