J. Phys. IV France 129 (2005) 93-96
Comparative analysis of acoustic emission signals generated by electrical discharges measured by the hydrophone and the wideband contact transducerT. Boczar and A. Cichon
Technical University of Opole, Faculty of Electrical Engineering and Automatics, Institute of Electric Power Engineering, ul. Sosnkowskiego 31, 45-272 Opole, Poland
The paper presents a comparative analysis of the acoustic emission (AE) pulses and signals generated by PDs. For this purpose the measurements of the acoustic emission signals generated by PDs were taken in the multipoint-plane system using a hydrophone placed directly in the area of discharge generation, and the AE pulses using a piezoelectric contact transducer which was on a side wall of a power transformer tub. Next, time runs and amplitude density spectra were drawn. Also the descriptors describing signals in the frequency domain were determined and the time-frequency analysis was carried out, which determined spectrograms for the energy density spectrum.
© EDP Sciences 2005