MULTIPHASE RECTIFIER Russian patent published in 2018 - IPC H02M7/155 H02H7/12 H02H7/125 

FIELD: electricity.

SUBSTANCE: multiphase rectifier comprises functionally connected elements: network terminals, an automatic switch with a control coil, a three-phase unit of phase control containing a three-phase transformer, whose primary and secondary windings are connected in a star, a three-phase rectification circuit, a phase control lamp, the first and second parallel-connected circuits. The first circuit comprises a relay break contact of the second circuit, to which a resistor shunted by a capacitor series-connected with the first circuit relay is connected, and the second circuit comprises paralleled relay make contacts of the first and second circuit, to which a resistor series-connected with the second circuit relay is connected. The blank terminals of both relays are connected via a Zener diode and connected to the positive terminal of the rectification circuit, and the circuit terminals connected to the break and make contacts are connected to the neutral conductor of the secondary winding of the three-phase unit transformer. Three-phase current control unit comprises the first, second and third current transformers included in the circuit line break, whose winding starts are connected to the positive terminal of the smoothing capacitor paralleled with the similar relay terminal through corresponding diodes. The ends of the mentioned windings are united into a common point, which is connected to the mentioned capacitor and relay. The rectifier comprises a magnetic amplifier, a power transformer, a rectification circuit and terminals for connecting consumers. A voltage control unit and a discriminating element attached to an intermediate amplifier, whose output is connected to the excitation winding, are paralleled between the rectification circuit and the mentioned terminals. The power transformer is made by type of a machine with a locked rotor that contains an inner core with grooves, wherein a primary three-phase winding is placed, and an outer core coaxial to the inner core, in whose grooves eight three-phase secondary windings are placed, to which corresponding series-connected three-phase bridge rectification circuits are connected, to whose common points the smoothing capacitor and terminals for connecting consumers are connected.

EFFECT: increased speed of protection against phase fault and short-circuit currents and quality of the rectified voltage.

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