Classification and application of transformers (1) according to the number of phase power supply can be divided into: single-phase transformer, three-phase transformer, polyphase transformer. (2) according to the cooling method can be divided into: dry type transformer: rely on air convection cooling, used for local lighting, electronic lines and other small capacity transformer. Oil-immersed transformer: depending on oil as cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooling, oil-immersed water-cooling, forced oil circulation, etc. (3) according to the working frequency, it can be divided into: low-frequency transformer, medium-frequency transformer, high-frequency transformer and pulse transformer.
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