The function of a conservator tank in an oil-immersed transformer is to:
ATake up expansion and contraction of transformer oil due to temperature changes
BCool the transformer windings directly
CPrevent overvoltage surges
DFilter out moisture from incoming air
Explanation
The conservator tank provides an expansion volume above the main transformer tank. As oil temperature fluctuates with load and ambient conditions, oil expands into or contracts out of the conservator, preventing pressure buildup and keeping the main tank completely filled.
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