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Commonly used transformer skeleton classification can be summarized as follows:
1, according to the number of phases:
(1) Single-phase transformer: used for single-phase load and three-phase transformer group.
(2) Three-phase transformer: it is used to step up and down the voltage of three-phase system.
2, according to the cooling method:
(1) Dry-type transformer: it is cooled by air convection and is generally used for small-capacity transformers such as local lighting and electronic circuits.
(2) Oil-immersed transformer: it depends on oil as cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation, etc.
3, according to the purpose:
(1) Power transformer skeleton: used for voltage rise and fall of 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 points:
(1) Double winding transformer: used to connect two voltage levels in the power system.
(2) Three-winding transformer: it is generally used in regional substations of power system and connected with three voltage levels.
(3) Autotransformer: used to connect power systems with different voltages. It can also be used as a common step-up or step-down transformer.
5, according to the core form points:
(1) Core transformer framework: power transformer for high voltage.
(2) Shell transformer: special transformer for high current, such as electric furnace transformer and welding transformer; Or power transformers for electronic instruments, televisions, radios, etc.17:59 2021/8/14