Variable 3-phase reversible voltage sources with use of saturable reactors

Abstract

This paper describes the circuit arrangements, with appropriate analyses, by which two or three saturable reactors may be used to supply a 3-phase load. The output voltages of the devices are constant-frequency 3-phase, almost sinusoidal sources which may be smoothly and continuously varied from an almost balanced positive sequence to an almost balanced negative sequence by variation of the saturable-reactor control currents.