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The oil conservator is a cylindrical container placed horizontally above the oil tank and connected by a pipe to the transformer. When the transformer oil expands due to heating, the oil flows from the oil tank to the conservator; when the transformer oil contracts due to cooling, the oil flows from the conservator back to the oil tank. The air above the oil level in the conservator communicates with the outside atmosphere through a vent pipe. A desiccant is placed in the vent pipe to reduce the moisture entering the conservator from the air.  
The bottom of the conservator is equipped with a sedimenter to collect any moisture and impurities that enter the conservator, which should be periodically removed. An oil level gauge is installed at one end of the conservator to monitor the oil level. If the oil is insufficient due to leakage or other reasons, oil should be added promptly to replenish it.