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To cool and to insulate the transformer.

Transformer oil has a higher specific heat capacity than air, so it is more efficient at removing energy through heat transfer, and limiting the windiings' temperature rise.

Transformer oil has a much greater dielectric strength than air, which means that components at different potentials can be placed closer together, so the overall volume of the transformer can be made smaller, giving it a smaller 'footprint'.

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12y ago

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