Power transformer specification
The standard power supply voltage rating is: 400 (380) V, 3000 V, 6300 V, 35000 V, 10000 V, 110000 V, 220000 V.
Therefore, the transformer has 6300/400; 10000/400; 35000/6300; 220000/10000 and other various ratios. There are also three turns of transformers such as 220000/35000/6300
Among them, 3000V, 6300V, and 110000V are transitional industrial electrical voltages, which are rare for civilian use.
Now 500,000 volts of ultra-high voltage DC power supply has been added.
Industrial transformers are available in several sizes
Classification of industrial transformers: 1. According to the number of phases
1) Single-phase transformer: for single-phase load and three-phase transformer group.
2) Three-phase transformer: used for the rise and fall voltage of three-phase systems.
2, according to the cooling method
1) Dry-type transformer: relying on air convection for natural cooling or increasing fan cooling, it is mostly used for small-capacity transformers such as high-rise buildings, high-speed toll stations, local lighting, and electronic circuits.
2) Oil-immersed transformer: rely on oil as cooling medium, such as oil-immersed self-cooling, oil-immersed air-cooled, oil-immersed water-cooled, forced oil circulation, etc.
3, according to the purpose of 1) power transformer: for the transmission and distribution system of the rise and fall voltage.
2) Instrument transformers: such as voltage transformers, current transformers, measuring instruments and relay protection devices.
3) Test transformer: It can generate high voltage and carry out high voltage test on electrical equipment.
4) Special transformers: such as electric furnace transformers, rectifier transformers, regulating transformers, capacitive transformers, phase shifting transformers, etc.
4, according to the form of winding
1) Two-winding transformer: used to connect two voltage levels in the power system.
2) Three-winding transformer: Generally used in power system regional substation, connecting three voltage levels.
3) Autotransformer: A power system used to connect different voltages. Can also be used as a normal boost or post-down transformer.
5, according to the core form
1) Core transformer: Power transformer for high voltage.
2) Amorphous alloy transformer: Amorphous alloy core transformer is a new type of magnetic conductive material, the no-load current is reduced by about 80%, which is an ideal distribution transformer for energy saving, especially suitable for rural power grids and developing regions. Lower place.
3) Shell-type transformer: special transformer for high current, such as electric furnace transformer, electric welding transformer; or power transformer for electronic equipment and television, radio, etc.
Power transformer parts
The power transformer is mainly composed of the following components: the body, the fuel tank, the oil pillow, the casing, the radiator and the like. The body is composed of a core and a coil, and the coil includes a primary coil and a secondary coil. The fuel tank is equipped with an explosion-proof cylinder (pressure release), a respirator, a gas relay, a thermometer, and the like.
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