Nine basic classifications for transformers are classified by structure, cooling method, winding method, application, and core type,Voltage regulation method, neutral point insulation level, conductor materials and installation methods.
Transformers use electromagnetic induction to change AC voltage by inducing current through a primary coil, secondary coiland iron core. Voltage transformation, current transformation, impedance transformation, isolation, voltage regulation (magnetic saturation transformer) are the main functions of the transformer.
The classification of transformers could be summarized as follows:
What are the classifications of transformers according to their Instructure?Classification by structure：
- Classification by structure：
- Single phase transformer：Transformers 330-1000kV for single-phase loads and three-phase transformer banks.
- Three-phase transformer：The transformer is used for step-ups and step-downs of three-phase voltages.
- Combined transformer：The transformer is divided into several parts that are reassembled once it has arrived at the site. It is used in areas where traffic is a problem.
What are the classifications of transformers according to their method of cooling?
2. Classification by structure method of cooling：
- Dry transformer：Transformers with a voltage range of 10-110kV. Using air convection to produce natural cooling, this type of transformer is mostly used for small-capacity transformers destined for high-rise buildings, high-speed toll stations, local lighting, and electronic circuits.
- Oil-submerged transformer：Transformers with a voltage range of 10~1000kV. Use oil as the cooling medium, such as an oil-immersed self-cooler, an oil-immersed air-cooler, an oil-immersed water-cooler, or a forced oil circulation unit.
- Transformer SF6：Transformers of 110kV are currently being used.
What are the classifications of winding transformer？
3. Classification by winding transformer：
- Dual winding transformer：Connects two voltage levels in a power system.
- Three-winding transformer：This type of power system substation connects three voltage levels.
- Autotransformer: Transformers for connecting different voltage power systems can also be used as step-up or step-down transformers.
What are the classifications of transformers according to their application？
4. Classification by application：
- Step-up transformer：Energy is generated by the power plant and sent to the grid.
- Step-down transformer：Power supply bureau substations are used for voltage conversion.
- Transformers for distribution：Provides power to the user.
- Power plant transformer：Electricity provided to the power plant on an internal basis.
- Substation transformer：It provides internal power to the substation.
- Converting transformers：One side of the DC transmission is connected to AC power, and the other side is connected to the converter valve.
- Rectifier transformer：Electrostatic precipitator powered by thermal power plant.
What are the classifications of transformers according to their construction?
5. Classification by construction：
There are three general types of transformer construction: core-type, shell-type and amorphous alloy transformer. Single-phase core-type construction consists of a core that provides a single-path magnetic circuit. Each leg of the core has overlapped high and low voltage windings.
- Core-type transformer：An electric power transformer for high voltages
- Shell-type transformer： This kind transformer for high currents, such as furnace transformers, welding transformers, or transformers for power supplies for electronic equipment, TVs, radios, etc.
- Amorphous alloy transformer：Amorphous gold transformers use a new type of magnetic material that reduces no-load current by about 80%,it is a distribution transformer with the best energy saving effect at the moment, suitable for places with low load rates, like rural grids and developing areas.
What are the classifications of transformers according to their voltage regulation method？
6. Classification by voltage regulation method：
There are two types of voltage regulating transformers: on-load voltage regulating transformers and non-excitation voltage regulating transformers.
What are the classifications of transformers according to their level of neutral insulation？
7. Classification by level of neutral insulation：
There are two types of transformers: fully insulated transformers and graded insulation transformers.
What are the classifications of transformers according to their wire material?
8. Classification by wire material：
There are copper winding transformers and aluminum winding transformers.
In the power system, the transformer’s main function is to increase or decrease electric energy voltage to facilitate efficient transmission, distribution, and use of the energy. According to the conductor material of the winding (coil), transformers are divided into two categories: copper windings and aluminum windings. Transformers with copper windings are now widely used in factory substations.
what are the classification of transformer according to installation requirements？
9. Classification by installation：
Installation methods for transformers include installing them on the ground, on a bench, on a pole, on a roof, or indoors.
