PDIV Modelling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors through Thermal Ageing

Naderiallaf, H.; Degano, M.; Gerada, C.

Abstract

This contribution develops the partial discharge inception voltage (PDIV)-FEM-based model based on Schumann’s streamer inception criterion (SCSIC) with respect to thermal ageing time (TAGT) or the insulation lifetime for the turn-to-turn insulation of coil winding made by rectangular insulated wires. The accelerated thermal ageing is performed at 250°C, which is 50°C higher than the thermal class, with ageing intervals of 156 and 312 hours. PDIV measurements are conducted at a constant temperature of 25°C, 40% relative humidity, and atmospheric pressure (1013 mbar). The measurements are done under AC 50 Hz excitations, following IEC 60034-18-41 guidelines for inverter-fed motor insulation system qualification. Furthermore, this study analyzes streamer inception parameters such as critical field line length (CFLL), effective ionization coefficient (α eff ), partial discharge (PD) inception field ( E discharge ), firing voltage (V firing ) and its correlation with PD charge amplitude as a function of TAGT or the insulation lifetime.

Citation

Naderiallaf, H., Degano, M., & Gerada, C. (2023). PDIV Modelling for Rectangular Wire Turn-to-Turn Insulation of Inverter-Fed Motors through Thermal Ageing. IEEE Transactions on Dielectrics and Electrical Insulation, 1-10. https://doi.org/10.1109/tdei.2023.3307048

• Journal Article Type: Article
• Acceptance Date: Aug 17, 2023
• Online Publication Date: Aug 21, 2023
• Publication Date: Aug 21, 2023
• Deposit Date: Aug 27, 2023
• Publicly Available Date: Sep 11, 2023
• Journal: IEEE Transactions on Dielectrics and Electrical Insulation
• Print ISSN: 1070-9878
• Electronic ISSN: 1558-4135
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Pages: 1-10
• DOI: https://doi.org/10.1109/tdei.2023.3307048
• Keywords: Accelerated ageing, inverter-fed machine, partial discharges, partial discharge inception voltage
• Public URL: https://nottingham-repository.worktribe.com/output/24585901
• Publisher URL: https://ieeexplore.ieee.org/document/10225566