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Research on Judgment Method of Insulation Vulnerable Spot for Low-voltage Random-wound Inverter-fed Motor Based on Three-curve Method
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Chizhou CHENG, Peng WANG, Xinting LIU, Yang SHI, Houlin GUO, Shakeel AKRAM
Insulating Materials | 2022, 55(5) : 108 - 114
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Insulating Materials | 2022, 55(5): 108-114
• Test and Analysis •
Research on Judgment Method of Insulation Vulnerable Spot for Low-voltage Random-wound Inverter-fed Motor Based on Three-curve Method
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Chizhou CHENG, Peng WANG, Xinting LIU, Yang SHI, Houlin GUO, Shakeel AKRAM
Affiliations
  • College of Electrical Engineering, Sichuan University, Chengdu 610065, China
Published: 2022-05-20 doi: 10.16790/j.cnki.1009-9239.im.2022.05.016
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The partial discharge inception voltage (PDIV) of the turn-to-turn insulation for low-voltage random-wound inverter-fed motor changes with the rise time of pulse voltage, resulting in that it is difficult to find the vulnerable spot of the insulation system when the rise time changes. Therefore, considering the rise time of pulse width modulation, we proposed a three-curve method to determine the insulation vulnerable spot of inverter-fed motors by combining the PDIV test technology under repetitive pulse and sinusoidal voltages. At first, the minimum PDIV distributions of main insulation and phase-to-phase insulation were obtained by testing their PDIV under the sinusoidal voltage. Then, the turn-to-turn insulation of inverter-fed motor was conducted PDIV tests using the repetitive pulse voltage with 50-200 ns of rising time, and the fitting curves of PDIV with rising time were obtained. At last, according to the three-curve diagrams, considering the rise time of motor, the vulnerable spot of insulation system was determined, and the feasibility of three-curve method was verified by breakdown experiment. The results show that the insulation vulnerable spot of low-voltage random-wound inverter-fed motor can be judged by the three-curve method, and the feasibility of the three-curve method is verified by breakdown test.

inverter-fed motors  /  insulation system  /  partial discharge  /  PDIV
Chizhou CHENG, Peng WANG, Xinting LIU, Yang SHI, Houlin GUO, Shakeel AKRAM. Research on Judgment Method of Insulation Vulnerable Spot for Low-voltage Random-wound Inverter-fed Motor Based on Three-curve Method[J]. Insulating Materials, 2022 , 55 (5) : 108 -114 . DOI: 10.16790/j.cnki.1009-9239.im.2022.05.016
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doi: 10.16790/j.cnki.1009-9239.im.2022.05.016
  • Receive Date：2021-05-16
  • Online Date：2025-12-22
  • Published：2022-05-20
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  • Received：2021-05-16
  • Revised：2021-06-23
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    College of Electrical Engineering, Sichuan University, Chengdu 610065, China
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https://castjournals.cast.org.cn/joweb/jycl/EN/10.16790/j.cnki.1009-9239.im.2022.05.016
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