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State the advantages and limitations of autotransformer.
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Advantages of Autotransformer :-

  • Less Costly

  • Better regulation

  • Low losses as compared to ordinary two winding transformer of the same rating.

  • It has a smaller size than an ordinary transformer of the same rating.

  • It requires a smaller exciting current than a 2-winding transformer of the same rating.

  • It required less Copper than an ordinary transformer of a similar rating.

  • It has better voltage regulation and operates at a higher efficiency than a 2-winding transformer of the same rating.



Limitation of Autotransformer :-

  • An auto transformer should not be used for interconnecting high voltage and low voltage systems.

  • Used only in the limited places where a slight variation of the output voltage from input voltage is required.

  • There is a direct connection between the primary winding and the secondary. Therefore, the output is no longer directly isolated from the input.

  • The short-circuit current is much larger than for the two-winding transformer of the same rating.

  • It is not safe for stepping down a high voltage to a low voltage. in case an open circuit develops in a common part of winding then full primary voltage appears across the load, it will dangerous to both people and equipment.

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