Comprehensive Analysis on Rotor Vibration Characteristics Based on a Novel Dynamic Stator Interturn Short Circuit Model of Synchronous Generator

Besides the static stator interturn short circuit (SSISC), the dynamic stator interturn short circuit (DSISC) may also occur in synchronous generators. However, at present, there is no effective model which can effectively analyze the generator characteristics under DSISC and identify the fault. To address this issue, this paper creatively presents a novel analysis model of DSISC for the first time. The degree and the position of short circuit are taken into consideration. Besides, the rotor vibration characteristics are comprehensively analyzed and compared under DSISC and SSISC. Further, the finite element (FE) calculation and the experiments are carried out on the CS-5 prototype generator. Meanwhile, the rotor mechanical response caused by the unbalanced magnetic pull (UMP) is obtained. The validity of the proposed model is confirmed by FE calculation and experiments. This paper provides the theoretical support for the diagnosis of DSISC fault in synchronous generators.