A Servo controlled voltage stabilizer utilizes a motor driven component and buck/boost transformers connecting the incoming phase supply and load. The primary winding of the transformer is connected to a continuously variable auto transformer in a way where one winding is connected with a determined tap point of the auto transformer.
The auto-transformers are driven by an AC synchronous motor to achieve increase or decrease of output set voltage by rotating in clockwise or anticlockwise direction according to the input supply voltage.
A manually operated servo voltage stabilizer is no less in functional qualities and performance parameters in regard with automated stabilizers. A three phase manually operated servo voltage stabilizer has three conductors in working for better stability and performance of industrial devices (three wired systems are generally promoted in industries).
Some performance parameters related to a three phase manually operated servo voltage stabilizer with the efficiency of 10 to 30 KVA by Servo voltage stabilizer manufacturers: