1. Divide by phase:
1) single-phase transformer: used for single-phase load and three-phase transformer group.
2) three-phase transformer: it is used for raising and lowering voltage of three-phase system.
2. According to the cooling method:
1) dry type transformer: rely on the natural air convection cooling or increase the cooling fan, used in high-rise buildings, more high-speed toll site and local lighting electricity, electronic circuit and other small capacity transformer.
2) oil-immersed transformer: rely on oil as the cooling medium, such as oil-immersed self-cooling, oil-immersed air cooling, oil-immersed water cooling, forced oil circulation, etc.
3. By use:
1) power transformer: used for raising and lowering voltage 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 transformer: such as electric furnace transformer, rectifier transformer, adjustment transformer, capacitor transformer, phase shifting transformer, etc.
4. According to winding form:
1) double-winding transformer: it is used to connect two voltage levels in the power system.
2) three-winding transformer: generally used in power system regional transformer substations, connected with three voltage levels.
3) self-coupling transformer: it is used to connect power system with different voltage.It can also be used as a normal boost or drop - back transformer.
5. In the form of iron core:
1) core transformer: high voltage power transformer.
2) amorphous alloy transformer, amorphous alloy iron core transformer is to use new magnetic materials, no-load current fell about 80%, energy saving effect is ideal distribution transformer, especially suitable for rural power grids and developing regions such as load rate is low.
3) shell transformer: special transformer for large current, such as furnace transformer and welding transformer;Or power transformers for electronic instruments, television, radio, etc.
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