The industrial use of synchronous motors by central stations

Synchronous motors in industrial use find their application in large group drives not subject to frequent starting, nor to starting under full load. A commercial motive must be supplied to the user through power rates favorable to unity power factor or leading load. Under such circumstances the use of constant voltage relays for potential regulation in conjunction with series reactance is recommended in cases where leading power factor on the feeders can be secured. Segmentation of the feeder by means of series reactance with a synchronous motor on each segment is recommended as giving uniform voltage distributed over the length of the line. The adaptation of the driven apparatus to synchronous motor starting conditions and to variable output at constant driving speed is suggested.