Transactions section: Preprint of corresponding pages from the current annual AIEE transactions volume: Correction for saturation

IT is generally agreed that the virtual or air-gap voltage of a salient-pole synchronous machine determines the saturation in the magnetic circuit. Studies have indicated that the major portion of the saturation occurs in the poles of such machines. Consequently, it is logical to apply a correction as a linear addition to the nominal or excitation voltage vector of the two-reaction diagram drawn with unsaturated constants, in order to ascertain the actual per-unit excitation necessary under load conditions which produce a certain air-gap voltage. It is the purpose of this paper to present an analytical method for determining the necessary correction.