Transient Analysis of Simultaneous Unbalanced Short Circuits of Synchronous Machines

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.