Short-Circuit Currents of Synchronous Machines

The importance of short-circuit forces in large alternators has warranted an investigation of them. The first step in this investigation, which is discussed in this paper, is the calculation of the short-circuit currents that produce them. The method of solution used is that of the assumption of zero resistance and constant flux linkages which has proven so useful in the solution of many short-circuit problems. Formulas are calculated in the Appendix for both the initial and permanent short-circuit currents of all circuits involved in the short-circuit. The formulas cover all the common connections of single-phase, two-phase and three-phase alternators. A discussion of some of these formulas, together with a plot of them for assumed alternator constants, is also given.