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The classification of commonly used power transformers

  • Author:hya
  • Source:hya.com
  • Release on :2018-04-11
The classification of commonly used power transformers can be summarized as follows:
1, according to the number of phases:
(1) Single-phase power transformers: For single-phase load and three-phase power transformer groups.
(2) Three-phase power transformer: It is used to raise and lower the voltage of three-phase system.

2, according to the cooling mode:
(1) Dry-type power transformers: They rely on air convection for cooling. They are generally used for small-capacity power transformers such as local lighting and electronic circuits.
(2) Oil-immersed power transformers: They rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooling, oil-immersed water-cooling, and forced oil circulation.

3, by purpose:
(1) Power transformer: It is used to raise and lower the voltage of the power transmission and distribution system.
(2) Instrument transformers: such as voltage transformers, current transformers, 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, and adjustment transformers.

4, according to the winding form:
(1) Two-winding transformer: used to connect two voltage levels in the power system.
(2) Three-winding transformer: It is generally used in substations of the power system area to connect three voltage levels.
(3) Autotransformer: Used to connect different voltage power systems. 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 core transformer is a new type of magnetic material, and the no-load current is reduced by about 80%. It is an ideal distribution transformer for energy saving, especially suitable for rural power grids and other areas in developing regions. The rate is lower.
(3) Shell-type transformers: Special transformers for large currents, such as electric furnace transformers, welding transformers, or power transformers for electronic equipment, televisions, radios, etc.

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