Categories commonly used transformer can be summarized as follows:
1, divided by the number of phases:
1) single-phase transformers: single-phase and three-phase transformer load group.
2) three-phase transformer: liter three-phase system is used, the voltage drop.
2, according to the cooling points:
1) dry-type transformers: to rely on natural air convection cooling fan cooling or increase, used for high-rise buildings, high-speed toll station electricity and local lighting, electronic circuits and other small capacity transformers.
2) oil-immersed transformers: rely on oil as a cooling medium, such as oil-immersed self-cooled, oil-cooled, oil cooling, forced oil circulation.
3, according to zoning:
1) Power transformers: distribution system for outputting liter, lower voltage.
2) The instrument transformer: such as voltage transformers, current transformers, instrumentation and protection equipment for measuring.
3) test transformer: to produce high-pressure, high-voltage electrical equipment test.
4) Special Transformer: If furnace transformer, rectifier transformers, adjusting transformers, capacitive transformers, phase-shifting transformers.
4, according to the winding form points:
1) double-winding transformer: power system for connecting the two box-type transformer voltage levels.
2) three-winding transformers: general area substation for power system, connecting three voltage levels.
3) autotransformer appliances: used to connect different voltage power system. Also can be used as an ordinary boost or lower after transformer.
5, according to the core in the form of points:
1) core-type transformer: used for high-voltage power transformers.
2) amorphous alloy transformer: amorphous alloy core transformer with new magnetic materials, load current decreased by about 80%, the energy saving effect is ideal distribution transformers, especially for rural power grids and developing regions and other loads where lower rates.
3) shell-type transformers: Special transformers for high-current, such as electric transformers, welding transformers; or used in electronic equipment and television, radios and other power transformer.