Electrical insulation material parameters and power electronic waveform environment

Industrial controls have experienced dramatic changes in the past twenty years. Especially advances in adjustable speed drive technology are very well observable. This technology produces repetitive pulses with the high level of voltage rise fronts (slew rates). However, this technology is an advantage for a drive control; the voltage waveforms generated by power frequency converters may affect significantly the reliability of the electric motor insulation systems. To improve understanding of the processes in the electrical insulation materials during pulse voltage aging, it is necessary to monitor values of the electric parameters within a pulse stress aging process. The experimentally measured data of the observed electric parameters during the pulse voltage aging are in this paper presented. The difference between the sinusoidal voltage aging and pulse voltage aging time dependencies is shown and well observable in this paper as well. This claim on prevention requires good knowledge of the electric parameters behavior. The result of this work shows how the electric insulation material parameters changes in power electronic waveform, environment in comparison to sinusoidal low frequency aging.