How to distinguish transformers
Writer： Hengfeng you electric Time：2023-04-23 views：times
The transformer is composed of an iron core (magnetic core) and a coil. The coil has two or more windings. The winding connected to the power supply is the primary coil, and the other windings are the secondary coils.
Transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its basic structure is composed of primary coil, secondary coil and iron core. It is widely used in industry, transportation and other fields. Next, we will briefly introduce the common types and main classifications of transformers.
A. Common types of transformers
Distribution transformer, power transformer, fully sealed transformer, combined transformer, dry-type transformer, oil immersed transformer, single-phase transformer, electric furnace transformer, rectifier transformer, reactor, anti-interference transformer, lightning protection transformer, box type transformer test transformer, angle transformer, high current transformer, excitation transformer, etc.
B.Main classification of transformers
1. According to the form of iron core:
(1) Core transformer: used for high-voltage power transformer.
(2) Amorphous alloy transformer: Amorphous alloy iron core transformer is a new type of magnetic conductive material. The no-load current drops by about 80%. It is a distribution transformer with ideal energy-saving effect, especially suitable for rural power grids and developing areas where the load rate is low.
(3) Shell type transformer: used for special transformers with large current, such as furnace transformer and welding transformer; Or power transformers for electronic instruments, televisions, radios, etc.
2. By use:
(1) Power transformer: used for raising and lowering voltage of power transmission and distribution system.
(2) Instrument transformer: such as voltage transformer, current transformer, measuring instrument and relay protection device.
3. According to winding form:
(1) Double winding transformer: used to connect two voltage levels in the power system.
(2) Three winding transformer: generally used in regional substations of power system to connect three voltage levels.
(3) Autotransformer: used to connect power systems with different voltages. It can also be used as an ordinary step-up or step-down transformer.
4. According to cooling mode:
(1) Dry type transformer: natural cooling by air convection or fan cooling, mostly used for small capacity transformers such as high-rise buildings, high-speed toll stations, local lighting, and electronic circuits.
(2) Oil immersed transformer: oil is used as cooling medium, such as oil immersed self cooling, oil immersed air cooling, oil immersed water cooling, forced oil circulation, etc.
5. According to the number of phases:
(1) Single phase transformer: used for single-phase load and three-phase transformer bank.
(2) Three phase transformer: used for raising and lowering voltage of three-phase system.
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