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Aiming at the vibration characteristics of the stator core caused by the inter-turn short circuit (ITSC) fault of fi eld winding of hydro-generator. Firstly, the air-gap fl ux density during the normal no-load operation and under ITSC of fi eld 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 fi eld winding are derived. The vibration characteristics and infl uencing factors of stator core before and after fault are revealed. A 2D fi nite element simulation model of a 165 MVA hydro-generator is established.

The fi nite 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 fi eld winding of hydro-generator by using the vibration characteristics of the stator core.

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