J. Phys. IV France
Volume 129, October 2005
Page(s) 89 - 92

J. Phys. IV France 129 (2005) 89-92

DOI: 10.1051/jp4:2005129019

The influence of the temperature of insulation oil on the results of measurements of the acoustic emission signals generated by partial discharges

T. Boczar and S. Borucki

Technical University of Opole, Faculty of Electrical Engineering and Automatics, Institute of Electric Power Engineering, ul. Sosnkowskiego 31, 45-272 Opole, Poland

The subject matter of this paper refers to the improvement of the acoustic emission method (AE) used for evaluation of partial discharges (PDs) generated in paper-oil insulation systems of power appliances. The paper presents the measurement and analysis results of the AE signals generated by partial discharges of the surface type (SPDs). The AE signals were measured on the surface of a transformer tub using a broad-band contact transducer, and then they were subject to a time-frequency analysis. The measurements were taken while heating transformer oil in the range from 30 to 85$^{\circ}$C with gradation of every 5$^{\circ}$C. For time runs, amplitude and energy density spectra the descriptor values that characterize them were calculated and then their comparative analysis was carried out to determine the influence of the insulation oil temperature changes on the measurement results of the AE signals generated by PDs.

© EDP Sciences 2005