Predetermination of synchronous phase-modifier performance

The author reviews the method for showing the behavior of transmission lines first given by Perrine and Baum and then shows how it can be used in determining the effect of the use of a synchronous motor operating without load for improving the power factor. The effect of the losses in the motor are shown both in their effect on the line alone and on the line with the step-up and step-down transfomrers included. The diagram given shows both the improvement in voltage regulation and the change in power factor due to the phase-modifier for any assumed condition of loading for the transmission line. The errors of the method are discussed with methods for determining their magnitude, and the advantages of the graphical treatment pointed out.