Abstract
The transients generated by drives based on pulse width modulation (PWM) have adverse effects on the insulation system of rotating machines, especially the stress grading (SG) system used in the endturn region. The surface corona inception voltage on SG system under repetitive impulse, 1kHz sinusoidal, and 1kHz square voltages was measured using a photomultiplier connected to optical fiber bundle, and the evolution of corona was observed using a ICCD camera. Four samples were evaluated to assess process-induced variations in performance. The macroscopic repetitive corona inception field was computed for each waveform from the measured surface corona initiation voltage on the SG system and was 25% to 50% of critical field for gas ionization.
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