Decrement curves for specific systems

GENERAL curves showing the current decay during system short circuits are given in the companion paper “Standard Decrement Curves.” Inasmuch as arrangements of systems and characteristics of synchronous machinery vary considerably, a single set of general curves based upon certain assumptions as to system layouts, time constants, etc., will be only approximate, and in some cases considerably in error. It is desirable therefore to have available more accurate methods for obtaining decrement factors. It is the purpose of the present paper to describe the methods by which are obtained these more accurate decrement factors especially adaptable to specific arrangements.