What are the differences between transformer and box transformer
Writer： Hengfeng you electric Time：2023-04-18 views：times
Box type transformer is a general term for the transformer system installed in the box （as protection）， which is divided into three parts: ① high voltage switch control room; ② Transformer room; ③ Low voltage switch control room. The capacity of box type transformer is relatively large. It is an equipment installed on the outdoor ground. The protection device in the box is relatively perfect and has metering device.
Ordinary distribution transformer generally refers to the transformer erected on two poles. It is called "substation" in power system. Because the capacity of desktop transformer is relatively small, the control part is also relatively simple: high voltage is generally controlled by "drop fuse", and low voltage is mostly controlled by "load knife switch" without arc extinguishing device.
Box transformer: a "combined" equipment including high-voltage incoming and outgoing lines, metering devices, transformers, low-voltage incoming lines, low-voltage distribution outgoing lines, etc., which is equivalent to a complete substation. However, box type substations are usually installed outside the building, so there are no special requirements for the selection of transformers. Generally, oil immersed transformers are used （low price）。
Dry transformer: it is only one kind of transformer, because the winding heat dissipation of dry transformer uses air for natural heat dissipation or forced air cooling （forced air convection by fan）， and there are no flammable and explosive substances, so it is widely used in places with high requirements, such as basement in buildings. In contrast, oil immersed transformers use the convection of transformer oil for heat dissipation, and the transformer oil has combustion risk in case of accident or leakage, so it can not be directly installed in the above places.
Ordinary transformer only refers to all kinds of transformers;
In fact, the box transformer is a combined electrical appliance. The box transformer includes high-voltage cabinet, transformer, low-voltage sub main cabinet, low-voltage metering cabinet, low-voltage reactive power compensation cabinet and low-voltage outlet cabinet, which is equivalent to an ordinary small distribution substation. The utility model has the advantages of small floor area and fast installation and commissioning speed, and is only applicable to the distribution configuration with a capacity of 500KVA and below.
"Box type substation" is the abbreviation of box type substation, also known as prefabricated substation or prefabricated substation. It is a factory prefabricated indoor and outdoor compact power distribution equipment with high-voltage switchgear, distribution transformer and low-voltage power distribution device arranged according to a certain wiring scheme, that is, the functions of transformer step-down and low-voltage power distribution are organically combined and installed in a moisture-proof, rust proof, dust-proof, rat proof, fire-proof, anti-theft, heat insulation, fully enclosed and movable steel structure box, It is especially suitable for urban network construction and transformation. It is a new substation rising after civil substation. Box type substation is suitable for mines, factories, oil and gas fields and wind power stations. It replaces the original civil power distribution room and power distribution station and becomes a new complete set of power transformation and distribution equipment.
Therefore, the box transformer is a high-voltage switchgear, and the transformer is a component of the box transformer. Therefore, the box transformer is not a transformer.
