Transformers with Load Ratio Control

Voltage regulation on transformers under sustained load has made rapid strides in the last eight years and found very wide application in extended power systems and on industrial loads. Originally it was found economical to equip only very large transformers for load ratio control, using apparatus designed for high currents. This paper describes, and compares with earlier developments, a novel equipment of low current rating, that has been devised especially to control small blocks of power, thereby greatly widening the economic field of application of load ratio control. The electromechanical features of this equipment are stressed particularly.