Humidity Impact on Streamer Inception Parameters for Turn-to-Turn Insulation of Inverter-Fed Motors

Naderiallaf, Hadi; Ji, Yatai; Giangrande, Paolo; Galea, Michael; Degano, Michele; Gerada, Christopher

Abstract

This study explores the impact of varying relative humidity (RH) levels (30%-90%) at 90°C on streamer inception parameters (SIPs) compared to those at 25°C. Schumann's streamer inception criterion (SCSIC) is used to assess the vulnerability of turn-to-turn insulation in inverter-fed motors with rising humidity at 90°C. The analysis includes SIPs such as effective ionization coefficient of air (αeff), partial discharge (PD) inception field (Einc), critical field line length (CFLL), and firing voltage (Vfiring). Furthermore, this study emphasizes the humidity-dependent shift in the Schumann constant (i.e., the natural logarithm of the critical electron number that determines the Townsend-to-streamer discharge transition, K) from 25°C to 90°C and advises caution when using the derived K at room temperature (e.g., 25°C) to predict PDIV at higher temperatures (e.g., 90°C), especially when RH≥50%.

Citation

Naderiallaf, H., Ji, Y., Giangrande, P., Galea, M., Degano, M., & Gerada, C. (2024, June). Humidity Impact on Streamer Inception Parameters for Turn-to-Turn Insulation of Inverter-Fed Motors. Presented at 2024 IEEE 5th International Conference on Dielectrics (ICD), Toulouse, France

• Presentation Conference Type: Edited Proceedings
• Conference Name: 2024 IEEE 5th International Conference on Dielectrics (ICD)
• Start Date: Jun 30, 2024
• End Date: Jul 4, 2024
• Acceptance Date: Apr 25, 2024
• Online Publication Date: Aug 12, 2024
• Publication Date: Jun 30, 2024
• Deposit Date: Nov 18, 2024
• Publicly Available Date: Jan 28, 2025
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Series ISSN: 2834-8311
• Book Title: Proceedings of the 2024 IEEE 5th International Conference on Dielectrics
• ISBN: 9798350308976
• DOI: https://doi.org/10.1109/icd59037.2024.10613207
• Public URL: https://nottingham-repository.worktribe.com/output/38898200
• Publisher URL: https://ieeexplore.ieee.org/document/10613207