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Damage curves of dry type power transformers

Damage curves of dry type power transformers

Damage curves of dry type power transformers

(OP)
One young colleague in our company works now on his diplom project. He must create IDMT-characteristcs for relay protection of power transformers according to damage curve of the protected transformer.
With oil-filled transformers it is clear how to calculate this  curve. But for dry type transformers there is no much experience in our country. We have damage curves from some manufacturers, but only in graphical view.
Could somebody advice me where to find formula for calculation of these curves? My authority as mentor is under challenge blushing smile

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It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant

RE: Damage curves of dry type power transformers

(OP)
Excellent source, thank you!

------------------------
It may be like this in theory and practice, but in real life it is completely different.
The favourite sentence of my army sergeant

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