Series-parallel 3 combined tap-changer 
As the name indicates, in this method tap changing is done after disconnecting the load from the transformer. Off load tap changing is normally provided in low power, low voltage transformers. It is the cheapest method of tap changing. The tap changing is done manually though hand wheel provided in the cover. In some transformers arrangements to change the taps by simply operating the mechanical switches are also provided.

We feel proud to introduce ourselves as one of the well-known manufacturers and exporters of Series-parallel connection combined Tap Changer. The offered tap changer is widely used for the testing of transformer. Our manufactured tap changer is provided with motor drives for achieving quick voltage change. The exported coarse type tap changer is capable of generating a variable voltage range, for testing purposes. Our manufactured coarse type tap changer is available at very affordable market rates.

Model Explanation
 WST □ - □/□-□╳□
    W:  off-circuit
    S :  three-phase or D for single phase
    T :  linear type tap chager
    □:  voltage regulation model
    □:  rated current
    □:  rated voltage
    □:  number of tapping heads
    □:  number of tapping position

Voltage Regulation Model
    I  :  terminal point
    II :   central point
    III :  neutral point
   IV :  Y-△ conversion
   V :  series-parallel connection

Samples Technical Data