FIELD: electricity.
SUBSTANCE: prevention of alternate voltage input to low-current control circuits is achieved by three-rod single-phase magnetic amplifier with protection against alternate voltage in control circuit, where control winding of the amplifier is positioned in middle rod, and semi-windings of operation power circuit are positioned on two outermost rods of three-rod core out of laminated electrical steel and are wound so that resulting flow generated by them and running through control winding was zero, and a part of middle rod of the magnetic amplifier is replaced with solid ferromagnetic insert out of low-coercivity soft magnetic iron. To increase resistance to alternate magnetic flow, a diamagnetic gap is made between solid ferromagnetic insert and laminated core of the magnetic amplifier.
EFFECT: prevention of alternate voltage input to control winding of single-phase three-rod magnetic amplifier.
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