How to distinguish between large, medium and small transformers
We usually put the capacity of 630kVA and below the transformer for the small transformer; 800-6300kVA transformer for the medium-sized transformer; 8000-63000kVA transformer for large transformers; 90000kVA transformer for large transformers. With the transformer capacity bigger and bigger, in the past that can only be called large-scale medium.
3, according to the use of points:
1) power transformers: for power transmission and distribution system of the rise and fall voltage.
2) instrument with transformers: such as voltage transformers, current transformers, for measuring instruments and relay protection devices.
3) test transformer: to produce high pressure, the electrical equipment for high pressure test.
4) special transformers: such as electric furnace transformers, rectifier transformers, adjust the transformer, capacitive transformers, phase-shifting transformers.
4, according to the winding form points:
1) Double winding transformer: Used to connect two voltage levels in the power system.
2) Three-winding transformer: generally used in power system area substation, connect three voltage levels.
3) Autotransformer: Power system for connecting different voltages. Can also be used as a normal step-up or down transformer.
5, according to the core form points:
1) core transformer: for high voltage power transformers.
2) Amorphous alloy transformer: Amorphous alloy core transformer is a new type of magnetic materials, no-load current drop of about 80%, is the energy-saving effect of the ideal distribution transformer, especially for rural power grids and developing regions such as load rate Lower place.
3) shell transformers: special transformers for high current, such as electric furnace transformers, welding transformers; or for electronic equipment and television, radio and other power transformers.
Transformer (Transformer) is the use of electromagnetic induction principle to change the AC voltage of the device, the main components are primary coil, secondary coil and core (core). The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage regulator (magnetic saturation transformer) and so on. According to the purpose can be divided into: power transformers and special transformers (electric furnace change, rectifier, frequency test transformer, voltage regulator, mine transformer, audio transformers, IF transformers, high-frequency transformers, impact transformers, instrument transformers, electronic transformers , Reactors, transformers, etc.). Circuit symbols commonly used as the beginning of the number. Example: T01, T201 and so on.
Commonly used transformer classification can be summarized as follows:
1, according to the number of points:
1) single-phase transformer: for single-phase load and three-phase transformer group.
2) three-phase transformer: for three-phase system of the rise and fall voltage.
2, according to the cooling method points:
1) Dry-type transformers: rely on air convection for natural cooling or increase fan cooling, used for high-rise buildings, high-speed toll stations and local lighting, electronic circuits and other small-capacity transformers.
2) oil-immersed transformers: rely on oil as a cooling medium, such as oil from the cold, oil-cooled, cold water, forced oil circulation.
