Unbalanced Operations of Three Phase Inductor Alternators with Damper Winding

Four different types of unbalanced short-circuits of an inductor alternator are studied. The case of simultaneous unbalanced short-circuits of the alternator is studied for the first time. For each case, complete solutions for armature, field and damper-circuit currents, short-circuit torque and open-phase voltage are developed. A numerical example solved for all the four cases is given and comparisons for significant points among the four cases are summarized.