Introduction to the working principle of magnetic voltage regulator

The magnetic voltage regulator is an organic combination of a saturable reactor (hereinafter referred to as a reactor) and a transformer. The reactor is mainly used to adjust the input voltage of the transformer, and the transformer increases or decreases the adjustable input voltage to any desired value of the load. Voltage value.

There are both electrical and magnetic connections between the reactor and the transformer. Its structure is similar to that of a general power transformer, unlike other types of voltage regulators that have a mechanical transmission device or a movable contact to adjust the voltage. This voltage regulator It is especially suitable for high voltage output or low voltage and high current output occasions. Salt bath furnaces, electron bombardment furnaces, high voltage electrostatic precipitators and other voltage regulators have been widely used in 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 core of the reactor is not subject to DC magnetization, and the AC effective magnetic permeability is the largest. The impedance reflected 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 U2min can be obtained when it reaches .

Gradually increase Ik, due to the different degrees of DC magnetization of the reactor core, the AC effective permeability gradually decreases, so the voltage y5l and the load voltage U2 gradually increase. If Ik reaches the rated value Jka, the reactor core will be affected by the DC height. The magnetization is saturated, the effective AC permeability becomes the smallest, and the impedance of the electric device is also the smallest compared with 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 eldest U2max