ALTERNATING VOLTAGE STABILISER WITH PROTECTION ELEMENTS (EMBODIMENTS)

摘要

This invention relates to electrical automatic systems able to restore the reference values of the AC variable voltage. The system of power circuit-breakers provides protection of an AC voltage regulator. A double-pole power circuit-breaker 21 is connected so that its first contact is made between the input of the mains phase conductor and the point of connection of the input of a regulating unit 2 and one of the outputs of a shunt release 22, which is the input of an additional protection unit 16 made as a diode bridge 17 whose output is connected to power electrodes of a protection thyristor 18. The second output of the shunt release 22 is connected to the input of the diode bridge 17, the second contact of the double-pole power circuit breaker is connected between the output of the regulating unit 2 and a point of connection of a load 3 and an output capacitor 15, thereby forming a triple-pole circuit-breaker the contacts of which are connected in a specific circuit between the second end of the transformer primary winding and mains 1. A stand-by double-pole power circuit-breaker 26 is connected between the mains and the load, and a remote control button 27 is connected between the first output of the shunt release 22 of the double-pole power circuit-breaker and the neutral conductor. Disclosed are the embodiments of an AC voltage regulator providing the step-down, step-up; step-up and step-down modes of operation for a separate voltage regulator and a voltage regulator in a cascade circuit with extended protection and service functions along with the improvement of some units.