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MOving a transformer to high height

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Hi friends
I have a question about transformers.
We have a transformer witch was designed for low height, if we move the transformer on for example a mountain, how will its parameters change?
Thanks.
 

What sort of transformer... a grid distribution transformer, site transformer, etc.?

Anyway, in general, large transformers need derating in current due to the lower ability of the less dense air to carry away heat. I've seen a figure of derating by 0.3% for every 100m above 100m altitude.

Voltage might also need derating if the conductors are open to air, due to lower arcing PD.

Review IEEE C57.13.
 
Thank you FoxyRick for your answer.

I agree that the lower ability of the less dense air to carry away heat is a negative mark for the situation of high altitudes, but do you agree that the lower temperature at high altitudes can be a positive mark for the situation?

Thanks.
 

Yes - I was thinking that as I wrote the above. However...

Lower ambient temperature will clearly have a positive effect. Given that all the information I've seen recommends to derate current though, suggests that whoever did the work, worked out (and probably measured) that the reduction in heat transfer away was greater than the mitigation of the lower ambient temperature.
 
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