Impact of High Frequency Switching Phenomena on Low Voltage Motor Insulation

B. Florkowska¹⁾,  M. Florkowski²⁾,  J. Furgał¹⁾,  J. Roehrich¹⁾,  P. Zydron¹⁾,

¹⁾ AGH University of Science and Technology,

Department of Electrical Egineering and Electrical Power,

30 - 059 Kraków, al. Mickiewicza 30, Poland

²⁾ ABB Corporate Research,

31 - 038 Kraków,  ul. Starowiślna 13A, Poland

e-mail of corresponding author:  furgal@agh.edu.pl

Telefon: +48 12 617 37 61

Exploitation stresses are causing degradation of high voltage insulation systems. The assessment of intensity and dynamics of these processes, being a consequence of local, working electric field strength is considered mainly at the sinusoidal voltage. However in applications where power electronics converters are used the voltage stress has usually a form of fast switching pulses composed of repetitive sequences. Such pulse trains poses usually a modulated width and fast rise- and fall-times. Such conditions have essential influence on inception and development of partial discharges in insulating systems subjected to non-sinusoidal stimulus. The insulation degradation mechanism is especially important for cables and electrical machines subjected to non-sinusoidal waveforms. The paper will present experimental results of application of non-sinusoidal waveforms on polymer cable insulation with special focus on rise time influence. The correlation with the spectral content will be also considered.

Corresponding author: Jakub Furgał

AGH University of Science and Technology

Department of Electrical Egineering and Electrical Power

30 - 059 Kraków

al. Mickiewicza 30, Poland

e-mail: furgal@agh.edu.pl

Telefon: +48 12 617 37 61