The transformer core and windings are contained in an oil filled tank. To be cooled, the oil is pumped to a separate radiator which, in this installation, is larger than the transformer tank itself. As a general rule, as the rating of transformers - and other electrical plant - increases, the cooling problem becomes more acute. The conservator is a reservoir which allows for the expansion of the oil during operation.
Source: EnergyAustralia.
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