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Transformer Data

Transformer Data

Transformer Data

(OP)
I have a transformer spec that includes the text Uk = 8%. Can anyone explain what this means? I have an idea but would rather check!

RE: Transformer Data

From the few international references I have:

Uk in % is impedance voltage drop of three pahse transformer

RE: Transformer Data

Quote:

Percentage Impedance voltage drop (Uk) is a factor inherent in the design of any transformer, and is a characteristic to which particular attention must be paid when design for parallel operation.
The percentage drop is determine by the formula:

Uk = (Ur2+Ux2)1/2
The following values are defined for full rating of transformer as follow:
Uk = is the percentage impedance drop
Ur = percentage resistance drop
Ux = percentage reactance drop
Ref The J & P Transformer Book

RE: Transformer Data

Is this directly related to % impedance voltage?

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