Impact of RISC fault position on stator thermal behavior in synchronous generators

Wen Zhang, Yu Ling He, Ming Xing Xu, Yi Fan Bai, Yong Li, Xiao Long Wang, David Gerada

Research output: Journal PublicationArticlepeer-review

2 Citations (Scopus)

Abstract

Rotor interturn short circuit (RISC) is a common electrical fault in generators. Investigations about such fault on the rotor vibrations, magnetic field variations, and current/voltage changes have been widely carried out, while the thermal properties of the stator side have been rarely studied. This paper presents a comprehensive study on the stator thermal behavior in synchronous generators under different RISC position and varied power load cases. Such thermal behavior includes not only the core loss, copper loss and temperature variations of the stator, but also the mechanical responses of the stator core due to the unbalanced thermal distribution. The whole work is based on the magnetic flux density (MFD) analysis, the core loss and copper loss calculation. Theoretical analysis, finite element calculation, and experimental study are carried out, respectively, by taking a 5 kV A two-pole prototype generator as the case study. During the analysis, the reinforced excitation performance by the automatic control system of the generator set due to the voltage sag caused by RISC is fully considered. It is shown that RISC will significantly increase the stator temperature due to the reinforced excitation. The farther RISC position away from the big tooth is, the larger temperature/thermal risk will be. Besides, the stator temperature will also enlarge with the increase in power load.

Original languageEnglish
Pages (from-to)3285-3302
Number of pages18
JournalJournal of Thermal Analysis and Calorimetry
Volume149
Issue number8
DOIs
Publication statusPublished - Apr 2024

Keywords

  • Power load
  • Rotor interturn short circuit
  • Stator temperature
  • Synchronous generator

ASJC Scopus subject areas

  • Condensed Matter Physics
  • General Dentistry
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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