Analysis on Rotor Vibration Characteristics under Dynamic Rotor Interturn Short Circuit Fault in Synchronous Generators

Yuling He, Mengya Jiang, Kai Sun (), Minghao Qiu and David Gerada
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Yuling He: Hebei Key Laboratory of Electric Power Machinery Maintenance and Failure Prevention, Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Mengya Jiang: Hebei Key Laboratory of Electric Power Machinery Maintenance and Failure Prevention, Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Kai Sun: Hebei Key Laboratory of Electric Power Machinery Maintenance and Failure Prevention, Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Minghao Qiu: Hebei Key Laboratory of Electric Power Machinery Maintenance and Failure Prevention, Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China
David Gerada: Department of Electrical and Electronics Engineering, University of Nottingham, Nottingham NG7 2RD, UK

Energies, 2023, vol. 16, issue 18, 1-17

Abstract: A dynamic rotor interturn short circuit fault may occur during synchronous generator operation. However, there is no method to analyze the generator’s characteristics under the dynamic rotor interturn short circuit fault and identify the fault. In order to solve this problem, a new dynamic rotor interturn short circuit fault analysis model is creatively proposed through mathematical derivation. Firstly, the rotor vibration characteristics and the mechanical response under magnetic pull excitation are theoretically analyzed. In addition, a finite element modeling method for the dynamic rotor interturn short circuit fault is proposed, and an experimental device is designed. The model of a synchronous generator under the dynamic rotor interturn short circuit fault is established to obtain the rotor’s unbalanced magnetic pulls and mechanical responses by finite element calculation. Finally, the rotor vibrations are tested on a CS-5 prototype generator. The validity of the model is verified by finite element calculation and an experiment. This paper provides theoretical support for the diagnosis of a synchronous generator’s dynamic rotor interturn short circuit fault.

Keywords: synchronous generator; rotor vibration; dynamic rotor interturn short circuit; magnetic flux density; unbalanced magnetic pull (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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