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There are two basic structural types of conservators: one is the conventional type, where no anti-oxidation device is installed inside the conservator, and the oil surface is exposed to the atmosphere, forming an open conservator. The other type is a sealed conservator equipped with anti-oxidation devices that isolate the transformer oil from the atmosphere. This type can be further classified into diaphragm type, bladder type, and metal bellows expansion tube type.
Basic requirements for conservators:
1. They should accommodate the expansion of oil caused by temperature rise during transformer operation.
2. They should accurately indicate the transformer oil level to prevent accidents caused by oil deficiency.