Abstract
When generator operates normally, armature reaction magnetic field synchronously rotates with rotor, and rotor winding won't induce additional harmonic current. When stator winding and rotor winding inter-turn short circuit fault has happened, armature reaction magnetic field non-synchronously rotates with rotor. So additional harmonic current is induced in rotor winding. Through analyzing electromagnetism characteristic on stator and rotor winding fault respectively, it is known that the additional excitation current harmonic on stator winding fault mainly is twice electrical frequency, and that on rotor winding fault is the function of air-gap excitation magnetic field harmonic frequency, poles' pairs of generator and rotor mechanical revolution. Finally, the excitation current of MJF-30-6 synchronous non-salient pole generator is acquired on stator and rotor winding inter-turn short circuit fault respectively, the results of verification show that the theory analysis is right.
