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What is ONAN in the transformer nameplate?
Is ONAN the only type of cooling used for transformers?
No, there are other types of cooling used for transformers as well. ONAF, for example, stands for Oil Natural Air Forced and means that the transformer is cooled by natural oil circulation but forced air circulation. There are also other cooling methods like OFAF, MWF, and OFWF which utilize various combinations of oil and water to cool the transformer.