RISC Fault of Non-Salient Wound-Rotor Synchronous Generator: A Detection Method and Effect Analysis of Insulation

Kai Sun, Yu ling He, Xue wei Wu, Wen Wang, David Gerada, Hong hua Bai, Wei ling Huang

Research output: Journal PublicationArticlepeer-review

Abstract

Rotor interturn short circuit (RISC) fault is one of the most prevalent fault types in the non-salient wound-rotor synchronous generator (WRSG). In the paper, the theoretical mechanism of the RISC fault is studied in detail. Building upon this understanding, from the fault detection and harm consequences, the further work of this article includes proposing a RISC detection method and analyzing the influence of RISC on the insulation thermal damage. On the one hand, a new detection for RISC fault is first proposed based on the phase voltage. The proposed detection method innovatively allows for accurate determination of both the severity and location of RISC faults. On the other hand, the loss and the temperature of the stator core-winding system are comprehensively investigated with varied RISC degrees and positions. The thermal responses of the winding insulation are obtained under the joint action of the external magnetic heat source and the internal electric heat source. The study identifies critical points of insulation vulnerability, particularly noting areas prone to noise and connection joints. This research contributes to the timely online identification of RISC faults and supports preventive maintenance strategies for protecting winding insulation.

Original languageEnglish
Pages (from-to)722-735
Number of pages14
JournalIEEJ Transactions on Electrical and Electronic Engineering
Volume20
Issue number5
DOIs
Publication statusPublished - May 2025

Keywords

  • fault detection
  • rotor interturn short circuit
  • stator core-winding system temperature
  • synchronous generator
  • thermal response
  • wound-rotor

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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