Voltage compensation circuit is made up of contacted booster T2 and compensation transformer T1. Contacted booster first is connected to the stabilizer’s output, the second received a compensation transformer first loop, and Compensation transformer secondary loop in series in the main circuit, its principle of compensation figure (4), excluding compensation transformer impedance voltage drop : U2=U1±Uc。

  When input phase voltage U1 change △U1, if compensate voltage Uc change △Uc and △U1=△Uc, output phase voltage U2 can maintain invariable. The adjustment of compensate voltage Uc is changed by the output voltage, the signal control servo electrical machinery rotation by the voltage examination unit,drive the contract booster electronic brush skids after decelerates and transmission system, adjust the contract booster’s 2 times voltage to change the compensate voltage, to realize the automatic maintenance output voltage regulation.

U1---- stabilizer input phase voltage

U2---- stabilizer output phase voltage

Uc---- stabilizer phase compensate voltage