Power transformer is an electrical appliance that transmits electric energy or signals from one circuit to another by using the principle of electromagnetic induction The amount of electrical energy delivered is determined by the power of the consumer. According to the cooling mode: dry type (self cooling) transformer, oil immersed (self cooling) transformer, fluoride (evaporative cooling) transformer. According to the dampproof way classification: open transformer, potted transformer, sealed transformer. According to the structure of iron core or coil: core transformer (insert core, C-type core, ferrite core), shell type transformer (insert core, C-type core, ferrite core), ring type transformer, metal foil transformer. According to the power supply phase number classification: single-phase transformer, three-phase transformer, multi-phase transformer.

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