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Transformer oil is a much better electrical insulator than air. So, in large Transformers, oil is used to reduce the flashover distances between live internal parts, thus reducing the overall bulk of the transformer. At the same time, oil helps cool the transformer either by natural convection, or by forced circulation.

'Dry transformers' are transformer that do not use oil for insulation or cooling purposes. They tend to be transformers with lower voltage and power ratings, where flashover and cooling is far less relevant.

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12y ago
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11y ago

dry type transformer means the transformer not filled by any cooling agent (like oil), upto 5MVA only we can make this type of transformer.

wet type transformer fully filled by colling oil(IS-991),it give proper cooling of the transformer,ONAN,ONAF like that..

Sivachandran

Design engg.

Andrew yule & co ltd

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Q: What is difference between a wet type and dry type transformer?
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