Electrical Engineering ⇒ Topic : Transformer cooling
As far as cooling methods are concerned, the transformers are of following two types
1. Dry type, and 2. Oil immersed type. :
Dry type transformers. Small transformers upto 25 kVA size are of dry type and have the following cooling arrangements :
(i) Air natural (ii) Air blast.
Oil immersed transformers. In general most transformers are of oil immersed type. The oil provides better insulation than air as it is a better conductor of heat than air. Mineral oil is used for this purpose.
Figure(a). Air blast cooling of radiator
Fig.(a) shows the cooling of transformers having capacities from 10000 kVA and higher. In such cases air blast cooling of radiator is used
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