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 extra 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-infiltrated air-cooled, oil-immersed water-cooled, forced oil circulation, etc.
3, according to the use 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. It 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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