Repetitive Partial Discharge Phenomena on Electrical Motor Coil Windings under High-Repetition Nanosecond Pulsed Voltages Driven by SiC MOSFET Inverter
نویسندگان
چکیده
This paper presents new findings on partial discharge (PD) phenomena under high-repetition nanosecond pulsed voltages, essential for the insulation design of electrical motors fed by silicon carbide (SiC) inverters with high-switching frequencies. Here, a twisted pair sample simulating turn-to-turn random-wound motor coil winding was subjected to voltages generated SiC inverter-based pulse generator. In this experiment, rise time at voltage 1.5 kV is 23 ns, width 500 and repetition frequency (PRF) ranges from 60 pps 1 Mpps. PRF range, inception (PDIV) found be almost constant. Meanwhile, repetitive (RPDIV) significantly reduced when exceeded several tens kpps. Under high conditions, high-density ions produced preceding PD remain in gap space between enameled wires during pulse-off period contribute initiation subsequent PD. The resulting increase probability occurrence reduces RPDIV. Unlike previous reports, study clarified difference characteristics PDIV RPDIV, providing valuable reference data inverter-fed motors. Based obtained results, we propose revising IEC60034-18-41 standard, which verifies PD-free system, incorporate effect waveform inverters.
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ژورنال
عنوان ژورنال: IEEE Access
سال: 2023
ISSN: ['2169-3536']
DOI: https://doi.org/10.1109/access.2023.3292886