The main classification content sharing of transformers
The classification of commonly used transformers can be summarized as follows
1) Single-phase transformer: used for single-phase load and three-phase transformer group.
2) Three-phase transformer: used to raise and lower the voltage of the three-phase system.
2. According to the cooling method
1) Dry-type transformer: rely on air convection for natural cooling or increase fan cooling, mostly used for small-capacity transformers such as high-rise buildings, high-speed toll stations, local lighting, and electronic circuits.
2) Oil-immersed transformer: rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooled, oil-immersed water-cooled, forced oil circulation, etc.
3. By use
1) Power transformer: used for raising and lowering the voltage of the power transmission and distribution system.
2) Instrument transformers: such as voltage transformers, current transformers, used for measuring instruments and relay protection devices.
3) Test transformer: It can generate high voltage and conduct high voltage test on electrical equipment.
4) Special transformers: such as electric furnace transformers, rectifier transformers, adjustment transformers, capacitive transformers, phase-shifting transformers, etc.
4. According to the winding form
1) Double winding transformer: used to connect two voltage levels in the power system.
2) Three-winding transformer: generally used in substations in power system areas to connect three voltage levels.
3) Autotransformer: used to connect power systems of different voltages. It can also be used as an ordinary step-up or step-down transformer.
5. According to the core form
1) Core transformer: Power transformer for high voltage.
2) Amorphous alloy transformer: Amorphous alloy iron core transformer is a new type of magnetically conductive material, and the no-load current drops by about 80%. It is a distribution transformer with an ideal energy-saving effect, especially suitable for rural power grids and developing areas. lower place.
3) Shell-type transformers: special transformers for high currents, such as electric furnace transformers, welding transformers; or power transformers for electronic instruments, TVs, radios, etc.