Condition monitoring of generator stator winding inter-turn short circuit fault based on electrically excited vibration

Generator rotor and stator vibration characteristics on stator winding inter-turn short circuit fault are analyzed. Through calculating the generator parameters of air-gap magnetomotive force, air-gap magnetic field energy and magnetic flux density on the fault, the frequency characteristic of imbalance magnetic pull acting on rotor and that of pulsating magnetic pull acting on stator core are found out. Then the rotor and stator radial vibration characteristics are gotten. Finally practically acquired vibration data on the spot of SDF-9 and MJF-30-6 type generator respectively, the results of verification show that the analysis is correct. On the other hand finds out the relationship between electric fault such as winding fault and mechanical vibration, and points out the vibration signal can be the symptom of winding faults as well as electric signal, and provides the new idea and method for study the electric fault