What is the difference between auto transformer and two winding transformer?
In two winding transformer, whole power is transferred from primary to secondary side by means of induction ONLY While, in the case of Auto transformer, part of the whole power is transferred by induction and rest of the power is transferred through conduction.
Why auto transformer is used in transmission and distribution?
Auto-transformer is used in the transmission and distribution systems when the transformation ratio for voltage is small. The rating of the transformer and copper saving can be maximized when the transformation ratio is low, i.e. lower than 2.
How does an auto transformer work?
An Auto Transformer is a transformer with only one winding wound on a laminated core. … On load condition, a part of the load current is obtained directly from the supply and the remaining part is obtained by transformer action. An Auto transformer works as a voltage regulator.
What are the two main types of transformers?
There are two types of potential transformers; the conventional wound type (or electromagnetic type) and the capacitor voltage (potential) transformer. For voltages exceeding 100 kV (phase) the conventional type of potential transformer becomes extremely expensive owing to the insulation requirements.
What is a 3 phase autotransformer?
The three-phase auto-transformer has a single coil that acts both as the primary and secondary coil. … They are used for starting induction motors, in audio systems, in power transmission and distribution, and even in railways.