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Auto Transformers

An autotransformer has its primary and secondary connected to each other electrically. A portion of the energy in an autotransformer comes from this connection while the balance comes directly from the supply.  An autotransformer is a tapped winding transformer that changes the voltage available locally to the voltage required by a particular load. Raychem auto transformers are also used for starting of large induction motors.

Its efficiency is more when compared with the conventional one.
Its size is relatively very smaller.
Voltage regulation of autotransformer is much better.
Lower cost
Low requirements of excitation current.
EHV Substations
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