Three-phase transformer is a common type of transformer, which converts the voltage and current of three-phase alternating current into three phases. It consists of three windings, called high voltage side winding, low voltage side winding and neutral winding.

In three-phase transformers, the high-voltage side windings are generally connected to the high-voltage network in the power supply system, while the low-voltage side windings are connected to the low-voltage network or load. Neutral winding is commonly used in systems with star connections, which can provide neutral extraction or grounding.

Three-phase transformer is a kind of transformer based on the principle of electromagnetic induction. When the three-phase AC current passes through the high voltage side winding, the magnetic field formed by the low voltage side winding causes the voltage to be induced in the low voltage side winding. Because of the different ratio of the transformer, the voltage and current of the high voltage side and the low voltage side have a certain change law.

Three-phase transformer is a kind of transformer widely used in power system, its role is to convert the voltage on the high-voltage transmission line to adapt to the transmission and distribution needs of different voltage levels. In the industrial sector, three-phase transformers are used to convert the power supply to match the voltage and current used by the equipment to drive various electric motors and equipment.