AUTOTRANSFORMERS

Advantages of Autotranformers As comparing with a two winding transformer of same rating autotransformer has following advantages, Require less Copper Operates at higher efficiency Better Voltage regulation Smaller Size Smaller Exciting current

Disadvantages of Autotranformers There is a direct connection between primary and secondary ie output is no longer dc isolated from input Not safe for using stepping down higher voltage Short circuit current is much larger than for the 2 winding transformer of same rating

Applications of Autotranformers Used to compensate voltage drop in transmission and distribution line known as BOOSTER TRANSFORMERS Used to reduce voltage supplied to ac motors during starting Used for continuously variable supply

Autotranformers

Autotranformers