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During the last decade, insulated-gate bipolar transistorbased electronic devices have increasingly been adopted to control the power supply of drives associated with Type I randomwound rotating machines, and new reliability problems have surfaced [1]. Pulse width modulator drives that are associated with these machines produce voltage waveforms having fast rise time fronts, and overvoltages at the...
The present work concerns the partial discharge (PD) activity in simple insulating system (twisted pairs) when switching voltage waveforms are applied. A special low frequency PD coupling system allowed to determine two quantities indicating the stress actually connected with the PD activity. Such parameters have been considered to determine life prediction models
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