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Can standard transformers be derated for use in ambient temperatures higher than the maximum of 40 Deg C (104 deg F) allowable by standards?

If the average ambient temperature exceeds 30 degrees Celsius the derating factor is 0.4% reduction of VA for every degree Celsius above 30 degrees Celsius per IEEE C57 12.96.
The IEEE formula that is used to derive the 0.4% factor is valid only up to an AVERAGE of 50 degrees Celsius. For average temperatures above that, consult the factory to supply a transformer designed for elevated ambient

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