Types and characteristics of transformers

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Types and characteristics of 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 transformers.

(2) Three-phase power transformer: used for the rise and fall voltage of three-phase systems.

2, according to the cooling method:

(1) Dry-type power transformer: It relies on air convection to cool, and is generally used for small-capacity power transformers such as local lighting and electronic circuits.

(2) Oil-immersed power transformer: rely on oil as cooling medium, such as oil-immersed self-cooling, oil-infiltrated air-cooled, oil-immersed water-cooled, forced oil circulation, etc.

3. According to the purpose:

(1) Power transformer: used for the rise and fall voltage of transmission and distribution systems.

(2) Instrument transformers: such as voltage transformers, current transformers, measuring instruments and relay protection devices.

(3) Test transformer: It can generate high voltage and carry out high voltage test on electrical equipment.

(4) Special transformers: such as electric furnace transformers, rectifier transformers, adjusting transformers, etc.

4, according to the form of winding:

(1) Double winding transformer: used to connect two voltage levels in the power system.

(2) Three-winding transformer: Generally used in power system regional substation, connecting three voltage levels.

(3) Autotransformer: A power system used to connect different voltages. Can also be used as a normal boost or post-down transformer.

5, according to the iron core form:

(1) Core transformer: Power transformer for high voltage.

(2) Amorphous alloy transformer: Amorphous alloy core transformer is a new type of magnetic conductive material, the no-load current is reduced by about 80%, which is an ideal distribution transformer for energy saving, especially suitable for loads in rural power grids and developing regions. The rate is lower.

(3) Shell-type transformer: special transformer for high current, such as electric furnace transformer, electric welding transformer; or power transformer for electronic equipment and television, radio, etc.