Transformer classification

The classification of commonly used transformers can be summarized as follows: 　　1. According to the number ...

The classification of commonly used transformers can be summarized as follows:

　　1. According to the number of phases:

　　1) Single-phase transformer: used for single-phase loads and three-phase transformer groups.

　　2) Three-phase transformer: used to increase and decrease the voltage of a three-phase system.

　　2. According to the cooling method:

　　1) Dry-type transformers: rely on air convection for natural cooling or increase fan cooling, which are mostly used for small-capacity transformers such as high-rise buildings, high-speed toll stations, local lighting, and electronic circuits.

　　2) Oil-immersed transformer: Relying on oil as the cooling medium, such as oil-immersed natural cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation, etc.

　　3. According to purpose:

　　1) Power transformer: used to increase and decrease 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, adjusting 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 power system regional substations, connected to three voltage levels.

　　3) Autotransformer: used to connect power systems with different voltages. It can also be used as an ordinary step-up or step-down transformer.

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