Synchronous machine constants

COMPANION papers “Calculation of Synchronous machine constants” by L. A. Kilgore and “Determination of Synchronous machine constants by Test” by S. H. Wright (see footnote) both of the Westinghouse Electric & Manufacturing Company, have been presented before the A.I.E.E. Until recently the theory of synchronous machines has required relatively few constants; a single value of reactance, usually called armature leakage, has been used to calculate the initial short-circuit current, and standard decrement curves have been applied to determine the rate of current decay. However, the need for greater accuracy in short-circuit and stability calculations has brought into quite general use the new theory involving symmetrical components. The various reactances and time constants affecting transient characteristics must be known in applying the new theory, and consequently there is a real demand for knowledge of these constants.