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The types of transformers are varied, but as far as their working principle is concerned, they are made according to the principle of electromagnetic induction. In general, the classification of commonly used transformers can be classified as follows.

(1) By use:

1) Power transformer: used to boost or buck the power system, is one of the most common and most commonly used transformers:
2) Test transformer: generate high voltage, high voltage test with electrical equipment:
3) Instrument transformers: such as voltage transformers, current transformers, used for measuring instruments and relay protection devices:
4) Transformers for special purposes: furnace transformers for smelting, rectifier transformers for electrolysis, welding transformers for welding, voltage regulation transformers for testing, etc.
(2) According to the number of phases:

1) Single-phase transformer: for single-phase load and three-phase transformer group:

2) Three-phase transformer: used for raising and lowering voltage of three-phase system.

(3) According to the winding form:

1) Autotransformer: used to connect ultra-high voltage, large capacity power systems:
2) Double-winding transformer: used to connect two voltage levels of the power system;

3) Three-winding transformer: used to connect three voltage levels, generally used in regional substations of power systems

(4) According to the core form:

1) Core transformer: for high voltage power system:
2) Shell type transformer: special transformer for high current, such as electric furnace transformer and welding transformer, etc. : or power transformer for electronic instruments and TV, radio, etc

(5) According to the cooling method:

1) Oil-immersed transformer: such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation and water internal cooling, etc. :
2) Dry transformer: rely on air convection for cooling, the current indoor power transformer, the sample is cooled by fan:
3) Inflatable transformer: use special gas (SF6) instead of transformer oil heat dissipation;
4) Evaporative cooling transformer: use special liquid instead of transformer oil for insulation and heat dissipation.

In the field of electrical engineering, transformers play an important role as an important component of power distribution systems.

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