Impact of stator interturn short circuit fault on shaft voltage in a synchronous generator

He, Yu‐Ling; Yang, Pei‐Jie; Sun, Kai; Xu, Zhen‐Li; Wang, Hai‐Peng; He, Xian‐Long; Gerada, David

Abstract

Shaft voltage often exists in synchronous generators due to the assembly error or various faults after the long‐term performance. The article investigates the shaft voltage characteristic under the stator interturn short circuit (SISC) condition. Different from other studies, this article mainly considers the mapping relationship between the amplitude–frequency characteristics of the shaft voltage and the SISC degrees. The detailed shaft voltage expressions are first derived based on the magnetic flux density under the normal condition and SISC condition. Then the finite element analysis and the experiment is studied on a CS‐5 prototype synchronous generator with two poles in order to validate the theoretical formula. The result shows that there is no shaft voltage in the normal condition, while the shaft voltage is generated obviously under the SISC condition. Meanwhile, the frequency component of the shaft voltage is mainly composed of odd harmonics including the first, third and fifth harmonics.

Citation

He, Y., Yang, P., Sun, K., Xu, Z., Wang, H., He, X., & Gerada, D. (2023). Impact of stator interturn short circuit fault on shaft voltage in a synchronous generator. IET Electric Power Applications, 17(3), 381-391. https://doi.org/10.1049/elp2.12271

• Journal Article Type: Article
• Acceptance Date: Nov 22, 2022
• Online Publication Date: Dec 7, 2022
• Publication Date: 2023-03
• Deposit Date: Feb 11, 2023
• Publicly Available Date: Feb 13, 2023
• Journal: IET Electric Power Applications
• Print ISSN: 1751-8660
• Electronic ISSN: 1751-8679
• Publisher: Institution of Engineering and Technology (IET)
• Peer Reviewed: Peer Reviewed
• Volume: 17
• Issue: 3
• Pages: 381-391
• DOI: https://doi.org/10.1049/elp2.12271
• Keywords: asymmetrical magnetic flux density, shaft voltage, stator interturn short circuit, synchronous generator
• Public URL: https://nottingham-repository.worktribe.com/output/14879450
• Publisher URL: https://ietresearch.onlinelibrary.wiley.com/doi/full/10.1049/elp2.12271
• Additional Information: This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.