F311 the Analysis of Generator Excitation Current Harmonics on Stator and Rotor Winding Fault

Abstract

When generator operates normally, armature reaction magnetic fie]d synchronous]y rotates with rotor, and rotor winding won't induce additional harmonic current, When stator winding hnd r6tor wlnding inter-turn short circuit fault has happened, armature reaction magnetic fie]d non-synchronous]y rQtates with rotor. so additional harmonic current is induced in rotor winding. Through analyzing electromagnetism charactcristic on stator and rotor winding fault respectively, it is known that the additional excitation current harmonic on stator winding fau]t mainly is twice electrica] frequency, and that on rotor winding fault is the function ofair-gap excitation magnetic field harmonic frequency, po]es' pairs ofgenerator and rotor mechanica] revolution.Finally, the excitation current of MJF-30-6 synchronous non-salicnt pole generator is acquired on stator and rotor winding jnter-turn short circuit fault respectively, the results of verification show that the theory analysis is right,