To improve cooling for the power transformer, its capacity will be increased. Is it true?

[WSO]

I have discussed this issue with an engineer about this topic. I think that to improve the efficiency of cooling system for the power transformer should be expand the thermal limit and allow for overloaded the transformer. So, the engineer ask me for the references. How to explain him?

 

[prc]

Scotty, IEC 60354:1991 is no more a valid standard and it has been superseeded by IEC 60076-7 in 2005.Standards are dynamic and I remember when I started my career in 1960's, I was religiously following BS Code of Practice, CP1010 from UK for this aspect.
I forgot to cover another aspect of overloading. Get 30-40 % more rating by adding more coolers.Never go for it with out consulting the OEM esp for large transformers.It is not the temperature rise of winding and oil alone that decide overload limit.One has to check the bushing, tap changer and connecting lead ratings and over all stray flux effect while going for continuoius overloading of 20-40 %.

 

[ScottyUK]

Thanks prc - I will update the reference to the old standard in my collection.

 

[WSO]

I am so sorry to make prc confusing. More transformer cooling, more transformer capacity.

Many thanks for all comments.