AutoTransformer Question

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a4u2fear

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Ideal 25kVA 480/120V 1PH transformer is to be used as an autotransformer supplying load from a 480V source

If it is in Buck mode, and the coils are carrying rated current, the max KVA load the transformer can accomodate is?

75kVA answer

I came up with 100kVA

Is somehow "coils carrying rated current" the key?  Or is the answer a mistake?

 
the current might have been caused by voltage serge ... that rating of 100 KVA is ok because it is within the range of what the transformer can handle
 
It means actual winding power handling capacity is only 1015 KVA but this autotransformer can handle 5000 KVA means auto transformer can handle 5 times more power and 5 times smaller than a conventional 2 winding transformer
 
Ideal 25kVA 480/120V 1PH transformer is to be used as an autotransformer supplying load from a 480V source

If it is in Buck mode, and the coils are carrying rated current, the max KVA load the transformer can accomodate is?

75kVA answer

I came up with 100kVA

Is somehow "coils carrying rated current" the key? Or is the answer a mistake?

Three 25 kVA single-phase transformers connected together to serve a three-phase load will be able to supply a total of 75 KVA. Each individual transformer is supplying 25 kVA.
 
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