The purpose of a conservator in an electric transformer is to provide a space for the expansion and contraction of the transformer oil due to changes in temperature. The conservator is a container located above the transformer and connected to Transformer tank by a pipe. The conservator is partially filled with transformer oil, and a gas space above the oil provides the necessary room for expansion and contraction.
As the transformer oil heats up, it expands and moves up through pipe into the conservator tank. As the transformer cools down, the oil contracts, and the conservator releases oil back into the transformer tank. The conservator helps to maintain a constant oil level in the transformer, ensuring that the transformer is always adequately lubricated.
Additionally, the conservator helps to protect the transformer from outside air and moisture. The conservator is typically equipped with a breather, which filters out moisture and impurities from the air that enters the conservator. This helps to prevent contamination of the transformer oil and prolong the lifespan of the transformer.