期刊
IEEE ACCESS
卷 11, 期 -, 页码 68826-68835出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/ACCESS.2023.3292886
关键词
Inverters; Voltage measurement; Silicon carbide; Partial discharges; Temperature measurement; Insulation; Voltage control; Electric motors; Surge protection; INDEX TERMS; Electrical motor; insulation; partial discharge; repetitive partial discharge inception voltage; silicon carbide inverter; surge voltage
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. The results show that the partial discharge inception voltage (PDIV) remains almost constant within a certain frequency range, but the repetitive partial discharge inception voltage (RPDIV) significantly decreases when the frequency exceeds several tens of kilo pulses per second (kpps). The study also reveals that under high-frequency conditions, the ions produced by previous PD contribute significantly to the initiation of subsequent PD.
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 the turn-to-turn insulation of a random-wound motor coil winding was subjected to high-repetition nanosecond pulsed voltages generated by a SiC inverter-based pulse generator. In this experiment, the rise time at a pulsed voltage of 1.5 kV is 23 ns, the pulse width is 500 ns, and the pulsed repetition frequency (PRF) ranges from 60 pps to 1 Mpps. In this PRF range, the partial discharge inception voltage (PDIV) was found to be almost constant. Meanwhile, the repetitive partial discharge inception voltage (RPDIV) significantly reduced when the PRF exceeded several tens of kpps. Under high PRF conditions, the high-density ions produced by the preceding PD remain in the gap space between enameled wires during the pulse-off period and contribute significantly to the initiation of subsequent PD. The resulting increase in the probability of PD occurrence reduces the RPDIV. Unlike previous reports, this study clarified the difference in the frequency characteristics between PDIV and RPDIV, providing valuable reference data for the insulation design of SiC inverter-fed motors. Based on the obtained results, we propose revising the IEC60034-18-41 standard, which verifies a PD-free system, to incorporate the effect of the pulsed voltage waveform of SiC inverters.
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