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Electrical Applications 2 by David W. Tyler

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Transmission and distribution of electrical energy 9
will be carried by the oil to cooling tubes on the outside of
former whence it is convected away by natural air circulation. For
this reason the building must be adequately ventilated. This is
achieved by fitting louvres in the door of the substation and air
bricks or more louvres high up in the walls. Very large transformers
are fan cooled but these are installed outdoors. The transformer is
either mounted on a plinth in the centre of a large pit filled with
stones or there is a small wall built around it. If the transformer
suffers a fault and oil leak