Rating Auto Transformers up to 22 KV, 600 A.
1-Increased KVA rating for a given size and mass.
2-Resistance and reactance are less compared to a two-winding transformer.
3-It is possible to get smooth and continuous variation of voltage.
1-Used as a safely starting machines such as induction motors and synchronous motors.
2-Boosters for compensating the voltage drop.
3-They can be used as variac.