Transformer is mainly the use of electromagnetic induction principle to change the AC voltage of an electrical equipment, the main component is a coil, two coil and core. Its main functions are: voltage conversion, current conversion, impedance conversion, isolation, regulation and so on.
Sorted by cooling method
Oil-immersed transformers, for example, can be divided into oil-immersed self-cooling transformers, oil-immersed air-cooled transformers, oil-immersed forced oil circulating air-cooled transformers, oil-immersed forced oil circulating water cooling transformers and oil-immersed forced oil circulation-oriented cooling transformers.
Sort by cooling medium
Can be divided into dry-type transformers, oil-immersed transformers and inflatable transformers. Dry-type transformers rely on air convection cooling, generally used for local lighting, electronic circuits and other small-capacity transformers. Oil-immersed transformers rely on oil as a cooling medium.
According to the way pressure regulator points
Can be divided into non-excitation voltage transformer and on-load tap changer.
According to the core form points
1) core transformer: for high voltage power transformers.
2) Shell Transformer: for large current special transformers, such as electric furnace transformers, welding transformers.
Classified by purpose
(1) power transformers.
Mainly used in power systems, such as step-up transformer, step-down transformer distribution transformers, contact transformers and plant transformers.
(2) special transformers.
Refers to the use of transformers other than power systems, such as voltage regulators, instrument transformers (voltage transformers and current transformers), mining transformers, test transformers rectifier transformers, electric furnace transformers, welding transformers and rotary transformers.