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2021
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Don't confuse a high-voltage switchgear with a transformer.
“Box-type substation” is short for box-type substation, also known as prefabricated substation or prefabricated substation. It is a compact indoor/outdoor power distribution equipment that integrates high-voltage switching equipment, distribution transformers, and low-voltage distribution devices according to a certain wiring scheme. The functions of transformer voltage reduction and low-voltage power distribution are organically combined.
It is installed in a moisture-proof, rust-proof, dust-proof, rat-proof, fire-proof, theft-proof, heat-insulated, fully enclosed, and movable steel structure box. It is particularly suitable for urban grid construction and transformation and is a new type of substation that has emerged after the traditional substations. Box-type substations are suitable for mines, factories, oil and gas fields, and wind power stations. They replace the original civil power distribution rooms and substations and have become a new type of complete set of transformation and distribution equipment.
Box-type substations include "combination" equipment such as high-voltage input and output lines, metering devices, transformers, low-voltage input lines, and low-voltage power distribution output lines, equivalent to a complete substation. However, box-type substations are usually installed outside buildings, so there are no special requirements for transformer selection; oil-immersed transformers are generally used.
So what is a transformer? Dry-type transformer: It is just one type of transformer. Because the heat dissipation of the dry-type transformer windings uses natural air cooling or forced air cooling (using a fan to force air convection), and there are no flammable or explosive substances, it is widely used in places with relatively high requirements, such as basements in buildings. Different from this is the oil-immersed transformer, which uses the convection of transformer oil for heat dissipation. However, transformer oil poses a combustion risk in case of accidents or leakage, and generally cannot be directly installed in the above-mentioned locations.
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