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The problem of simultaneous unbalanced short circuits of synchronous machines is solved for the first time. The complete solutions for armature, field, and damper-circuit currents and for the short-circuit torque are derived directly by mathematical analysis. A numerical example is given and the results are presented by graphs. Comparisons of the present case with single-phase short circuit cases are summarized in Appendix II of this paper.
Hyunsang Hwang (Thu,) studied this question.