Brief introduction of power transformer Classification and characteristics of power transformer
Introduction to power transformers According to the size of the transmission power, power transformers can be divided into several grades: 10kVA and above for high power, 10kVA to 0.5kVA for medium power, 0.5kVA to 25VA for low power, and below 25VA for micro power. It should be self-evident that the design of the power transformer is different for different transmitted power. Some people translate the English name "Power Transformers" into "power transformers" according to its main function of power transmission.
Brief Introduction of Power Transformer
According to the size of the transmission power, the power transformer can be divided into several grades: above 10kVA is high power, 10kVA ~ 0.5kVA is medium power, 0.5kVA ~ 25VA is low power, and below 25VA is micro power. It should be self-evident that the design of the power transformer is different for different transmitted power. According to its main function of power transmission, someone translated the English name "powerTransformers" into "power transformer", which is still used in many documents. Is it called "power transformer" or "power transformer"? It is up to the authority on technical terminology to choose the decision.
Classification and characteristics of power transformers
The classification of commonly used power transformers can be summarized as follows:
(1) According to the number of phases:
1) Single-phase power transformer: used for single-phase load and three-phase power transformer group.
2) Three-phase power transformer: used for raising and lowering the voltage of the three-phase system.
(2) According to the cooling method:
1) Dry-type power transformer: rely on air convection for cooling, generally used for small-capacity power transformers such as local lighting and electronic circuits.
2) Oil-immersed power 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) According to the purpose:
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;
(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 form of iron core:
1) Core transformer: Power transformer for high voltage.
2) Amorphous alloy transformer: Amorphous alloy 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 at present, especially suitable for rural power grids and developing regions Where the load rate is low.
3) Shell-type transformers: special transformers for large currents, such as electric furnace transformers, welding transformers; or for electronic instruments and televisions.
