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Transformer Capacity

Transformer Capacity

Transformer Capacity

(OP)
Based on power quality study which was performed there is a
current THD level of average 7.8% .
Transformer is 500KVA.
I am trying to figure out what would be the derating factor for this transformer.

I have all RMS values for 1-16th harmonics and based on that I am getting k=1.3 which is pretty low!!!

I can not use IEEE 57.110-1986 because I don't have any test data or detail info on transformer.

I know that there is a curve for transformer capacity based on k factor rating,however I belive that is based on loss calculations and...

Any suggestions on this.
Is there any other way of caluclating this
Thanks for all the feedbacks.

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