Transmission systems with over-compounded voltages

A usual method of calculating a transmission line with transformers, in which the voltage is held constant at both ends by synchronous condensers, is to use the circle diagram method. It is often advisable to use “over-compounded” voltage instead of constant voltage; that is, to increase the voltage as the load increases. Methods of calculation are given in this paper for two cases, first with over-compounded generator voltage and constant receiver voltage, in which case the diagram is a circle, and second, with over-compounded voltage at both generator and receiver, in which case the diagram is an ellipse. Examples are given and the diagrams are shown in Fig. 2. A short discussion is given of the advantages and limitations of using over-compounded voltage.