There are single-phase and three-phase transformers according to the number of phases. There are power transformers, specialized power transformers, voltage regulating transformers, measuring transformers (voltage transformers, current transformers), small power transformers (used for small power equipment), safety transformers, and two types of core and shell transformers according to their structures. The coil has dual windings and multiple windings, and is an autotransformer. It can be divided into oil immersed and air-cooled according to the cooling method.
The voltage ratio between the primary and secondary coils of a transformer and the turns ratio between the primary and secondary coils are related
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