The Calculation of Alternator Swing Curves The Step-by-Step Method

The paper is intended to give a thorough explanation of step-by-step calculations of the synchronous rotor oscillations and other transients, which occur in electrical power systems when faults or other sudden changes take place. It is divided essentially into two parts. In Part I a descriptive illustration of the phenomena is given in order that the reader may visualize the conditions. In Part II general formulas are developed for calculations where any number of salient or non-salient pole machines are operating at various points on an impedance network. In Appendix I a special and simplified example is set up and analyzed. In Appendices II and III the numerical calculations of the swing curve for the special example in Appendix I are given, and a brief discussion is offered on the accuracy of this step-by-step method of calculation.