Power transformers are classified according to the number of phases: single-phase and three-phase.

Power transformers are classified according to windings: double winding (each phase is installed on the same core, the primary and secondary windings are wound separately and insulated from each other), three winding (each phase has three windings, the primary and secondary windings are wound separately and insulated from each other), Autotransformer (a set of windings with center tap as primary or secondary output). A three-winding transformer requires the capacity of the primary winding to be greater than or equal to the capacity of the second and third windings. The percentages of the three winding capacities in the order of high voltage, medium voltage and low voltage are: 100/100/100, 100/50/100, 100/100/50. It is required that the second and third windings cannot operate at full load. Generally, the tertiary winding has a lower voltage and is mostly used for power supply in close areas or for connecting compensation equipment to connect three voltage levels. Autotransformer: There are two types: step-up or step-down. Because of its small loss, light weight and economical use, it is widely used in ultra-high voltage power grids. The commonly used model of small autotransformers is 400V/36V (24V), which is used to power security lighting and other equipment.

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