Do you know how magnetic voltage regulators work?

The magnetic voltage regulator is a combination of a saturable reactor (hereinafter referred to as a reactor) and a transformer. The reactor is mainly used to regulate the input voltage of the transformer, and the transformer can increase or decrease the adjustable input voltage to any required level required by the load. voltage value.

The reactor and the transformer have both an electrical connection and a magnetic connection. The structure of the two is similar to that of an ordinary power transformer, unlike other types of movable contacts that have mechanical drive installation or voltage regulation for voltage regulation. This type of voltage regulator is suitable for places with high voltage output or low voltage and high current output. Salt bath furnaces, electronic bombardment furnaces, high voltage electrostatic dust removal installations and other voltage regulating power supplies have adopted Da type voltage regulators.

When the input terminal of the magnetic voltage regulator is connected to the voltage U1 and the output terminal is connected to the rated negative resistance R, if the DC control current Ik=0, the reactor will not be magnetized by the DC, and the AC permeability is large, which reflects The impedance on the winding G is much larger than the total primary impedance of the transformer. Therefore, the power supply voltage is basically distributed on the winding G, while the voltage UB1 on the primary side of the transformer is very small, and the lower limit of the load voltage can be obtained when it reaches U2min.

Gradually increase Ik, because the dead center of the reactor is subjected to different levels of DC magnetization, the AC permeability gradually decreases, so the voltage y5l and the load voltage U2 gradually increase. If Ik reaches the rated value Jka, the dead center of the reactor is highly magnetized by DC In saturation, the impedance of the electric device is also smaller than the primary total impedance of the transformer. Therefore, the voltage U1 is basically distributed on the winding Bl. At this time, the load voltage U2 can reach the larger U2max.