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Transformer inductance & resistance

Transformer inductance & resistance

Transformer inductance & resistance

(OP)
Is there a rule of thumb as to figuring out what the inductance and resistance should be in a transformer for a given power rating [kVA or MVA], turns ratio, and may be voltages?

I heard there is this 5% or 10% rule.  I am putting together a model but Manufacturers don't usually give you the specs on inductance and resistances.

RE: Transformer inductance & resistance

There are recommended impedances in the ANSI standards for power transformers.  The impedance is almost entirely inductive.  Impedance is a function of the transformer voltage (BIL) and size (as a first approximation).  It can vary quite a bit.  

The IEEE Red Book has typical values of impedance and X/R for various types and sizes of transformers - that would be a good starting point.

But no, there is no one-size fits all method to estimate transformer impedance based only on the kVA rating.  

Hope that helps.

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