Basic classification of transformers: single-phase and three-phase

    A transformer is an electrical component used to change voltage, current, or impedance, and is the main equipment for transmitting and distributing electricity in the power system

 When transmitting electricity over long distances, transformers can be used to increase the voltage sent out by the power station, in order to reduce losses during power transmission and facilitate long-distance power transmission; In areas where electricity is used, transformers lower the high voltage to supply electrical equipment and users. There are many ways to classify transformers, which can be mainly divided into single-phase transformers and three-phase transformers based on their different power supply phases.

 A single-phase transformer is a type of transformer whose primary winding is a single-phase winding. As shown in Figures 1-2, both the primary and secondary windings of a single-phase transformer are wound around the iron core. The primary winding is the AC voltage input terminal, and the secondary winding is the AC voltage output terminal. The output voltage of the secondary winding is directly proportional to the number of turns of the coil.

 A single-phase transformer can convert high voltage power supply into single-phase low voltage for use by various equipment. For example, it can convert AC 6600V high voltage into AC 220V low voltage through a single-phase transformer, providing power for lighting or other equipment. A single-phase transformer has the advantages of simple structure, small size, and low loss, and is suitable for use in low-voltage distribution lines with small loads (below 60Hz).

 Three phase transformer is a type of transformer widely used in power equipment. A three-phase transformer is actually composed of three single-phase transformers of the same capacity, with the primary winding (high-voltage coil) being three-phase and the secondary winding (low-voltage coil) also being three-phase

 Three phase transformers are mainly used for boosting or reducing voltage in three-phase power supply systems. A commonly used method is to convert a high voltage of several thousand volts into a low voltage of 380V, providing power supply for electrical equipment

 The application range of three-phase transformers is relatively wide, such as substations, industrial and mining enterprises, construction sites, drainage and irrigation equipment, postal and telecommunications, textiles, railways, schools, hospitals, national defense, elevators, etc. It is also suitable for some low-voltage distribution lines with low power supply voltage and large fluctuations