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Transformer impedance calculation

Transformer impedance calculation

Transformer impedance calculation

(OP)
How do i calculate X and R for a power transformer like 10 or 20 MVA  if i have only Z. Is there any standard X/R ratios for these transformers?

RE: Transformer impedance calculation

Cutler Hammer list transformers 10 mva 69kv as
5.5%   x/r = 10  above 69kv 7.5%  x/r = 12

12 mva to 30 mva 10%  x/r =20

RE: Transformer impedance calculation

The IEEE Red Book has a graph of average X/R ratio as a function of transformer type and rating.  

There is no way to directly calculate without the transformer test data.

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