Transformer output current @ Different tap

MG over 5 years ago

Hi all,

Say we have a distribution transformer which has a nominal current output. If this transformer is tapped at the primary should we assume that the power rating of the transformer is constant and as such the output current will change to satisfy the constant power rating?

I.E. 1MVA, 11kV/433V transformer has a nominal output current of 1333 A. If the primary is tapped at +5%, then to satisfy the transformer apparent power rating remaining constant means the output current now is increased by 5% at 1400A.

Thanks

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0 MG over 5 years ago

Thanks for the response Alan, I suppose I was looking at this from a different perspective.

Perhaps taking the maximum nominal secondary current as the transformer output limit is the way forward since the tap is made at the primary as you described it is there to compensate and ensure pretty much steady secondary output close to the nominal
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0 MG over 5 years ago

Thanks for the response Alan, I suppose I was looking at this from a different perspective.

Perhaps taking the maximum nominal secondary current as the transformer output limit is the way forward since the tap is made at the primary as you described it is there to compensate and ensure pretty much steady secondary output close to the nominal
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Transformer output current @ Different tap

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