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<p>Aiming at the vibration characteristics of the stator core caused by the inter-turn short circuit (ITSC) fault of field winding of hydro-generator. Firstly, the air-gap flux density during the normal no-load operation and under ITSC of field winding operation are analyzed. The expressions of the radial electromagnetic (EM) force on the stator core of hydro-generator before and after ITSC fault of field winding are derived. The vibration characteristics and influencing factors of stator core before and after fault are revealed. A 2D finite element simulation model of a 165 MVA hydro-generator is established. The finite element simulation of EM force and vibration frequency of stator core under normal no-load operation and different short-circuit degree faults are carried out. The simulation and theoretical analysis results are consistent, verifying the correctness of the theoretical derivation. The research results provide a theoretical reference for diagnosing ITSC fault of field winding of hydro-generator by using the vibration characteristics of the stator core.</p>

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Study on Vibration Characteristics of Stator Core during Inter-Turn Short Circuit of Field Winding in Hydro-Generator

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Peng Xin,
  • Peirui Liu

摘要

Aiming at the vibration characteristics of the stator core caused by the inter-turn short circuit (ITSC) fault of field winding of hydro-generator. Firstly, the air-gap flux density during the normal no-load operation and under ITSC of field winding operation are analyzed. The expressions of the radial electromagnetic (EM) force on the stator core of hydro-generator before and after ITSC fault of field winding are derived. The vibration characteristics and influencing factors of stator core before and after fault are revealed. A 2D finite element simulation model of a 165 MVA hydro-generator is established. The finite element simulation of EM force and vibration frequency of stator core under normal no-load operation and different short-circuit degree faults are carried out. The simulation and theoretical analysis results are consistent, verifying the correctness of the theoretical derivation. The research results provide a theoretical reference for diagnosing ITSC fault of field winding of hydro-generator by using the vibration characteristics of the stator core.