CAUSES OF DISCREPANCIES ON CALCULATION OF ROTOR QUANTITIES AND EXACT EQUIVALENT DIAGRAMS OF SYNCHRONOUS MACHINE

The conventional diagram of the synchronous machine accurately represents only the stator circuit. It will be shown with the aid of examples that transients for rotor quantities (rotor voltage, rotor current, etc.) can also be predetermined with satisfactory accuracy if calculations are based on equivalent diagrams correctly representing field and damper as well as stator circuits. For this purpose the newly defined reactance xc or xrc has to be known in addition to the conventional characteristic reactances and time constants usually employed for representation of an idealized machine. The reactance xc or xrc can be determined from the dimensions of the machine. Finally equivalent diagrams are presented taking into consideration solid poles and other iron parts. Copyright © 1969 by The Institute of Electrical and Electronics Engineers, Inc.