Comprehensive Investigation of Thermal and Mechanical Loads on Stator Winding Insulation in Non-salient Synchronous Generator under RISC fault

Sun, Kai; He, Yu-Ling; Chen, Hui-Cai; Wu, Xue-Wei; Yang, Jia-Wen; Tang, Guiji; Zhang, Fengyu; Gerada, David

Abstract

Current studies on frequent rotor interturn short circuits (RISC) primarily focus on fault diagnosis. However, the detrimental effect of RISC on the fragile stator winding insulation of synchronous generators is overlooked. Consequently, this article comprehensively investigates thermal and mechanical loads, as well as the structural responses of the stator winding insulation. The impact of RISC fault on the thermal and mechanical degradation distribution patterns of the insulation is explored in detail. Besides, different from the current research on RISC, this study considers a broader range of influencing factors, including the degree, position, contact resistance, and output. In this paper, detailed theoretical models for calculating thermal and mechanical loads are presented. FEA and experiments are conducted on a 5kW synchronous generator to calculate and test thermal and mechanical loads on the insulation. The mechanical, thermal, and coupling structural responses of the insulation are obtained and compared. The results indicate that maximum insulation structural responses caused by mechanical loads, thermal loads, and coupling actions is most pronounced at the nose end and the junction between the straight and involute lines, warranting careful attention. This study offers a unified approach and a practical framework for extended insulation service life.

Citation

Sun, K., He, Y.-L., Chen, H.-C., Wu, X.-W., Yang, J.-W., Tang, G., Zhang, F., & Gerada, D. (2025). Comprehensive Investigation of Thermal and Mechanical Loads on Stator Winding Insulation in Non-salient Synchronous Generator under RISC fault. IEEE Transactions on Instrumentation and Measurement, 74, Article 1502017. https://doi.org/10.1109/tim.2025.3542101

• Journal Article Type: Article
• Acceptance Date: Dec 27, 2024
• Online Publication Date: Feb 17, 2025
• Publication Date: Feb 17, 2025
• Deposit Date: Feb 20, 2025
• Publicly Available Date: Mar 21, 2025
• Journal: IEEE Transactions on Instrumentation and Measurement
• Print ISSN: 0018-9456
• Electronic ISSN: 1557-9662
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 74
• Article Number: 1502017
• DOI: https://doi.org/10.1109/tim.2025.3542101
• Keywords: no-salient synchronous generator, winding insulation, rotor interturn short circuit, thermal and mechanical loads, structural responses
• Public URL: https://nottingham-repository.worktribe.com/output/45597632
• Publisher URL: https://ieeexplore.ieee.org/document/10891631