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

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

Research output: Journal PublicationArticlepeer-review

2 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)381-391
Number of pages11
JournalIET Electric Power Applications
Volume17
Issue number3
DOIs
Publication statusPublished - Mar 2023

Keywords

  • asymmetrical magnetic flux density
  • shaft voltage
  • stator interturn short circuit
  • synchronous generator

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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