An introduction of prefabricated substation

- Apr 05, 2019-

Box-type substation, also known as pre-installed substation or pre-installed substation. It is a high-voltage switchgear, distribution transformer and low-voltage power distribution device. It is a factory prefabricated indoor and outdoor compact power distribution equipment that is integrated according to a certain wiring scheme. It combines the functions of transformer step-down and low-voltage power distribution organically. Together, it is installed in a steel structure box that is moisture-proof, rust-proof, dust-proof, rodent-proof, fire-proof, anti-theft, heat-insulated, fully enclosed and movable. It is especially suitable for urban network construction and renovation. It is a rise after the civil construction substation. A new substation. The 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 substation and becomes a new type of transformer distribution equipment.

In recent years, the load density of low-voltage power supply has been increasing, and high requirements have been placed on the reliability and quality of power supply. In this case, if the power is supplied to the surrounding users at a low voltage centered on a large-capacity substation, a large amount of non-ferrous metal will be consumed, and the power loss is large, and the power supply quality cannot be guaranteed. On the other hand, if the high voltage is applied to the load center and the substation is built in the load center, the low voltage supply radius can be shortened, the power supply quality can be improved, the nonferrous metal can be saved, and the power loss can be reduced. It is most suitable to build a box-type substation in the load center.

High-voltage/low-voltage pre-packaged substation (also known as box-type substation or combined substation (combined box substation), complete substation, mobile substation, produced in the 1970s, domestically There are several manufacturers producing. The structure is generally a box structure, which is provided with three parts: a high voltage switch chamber, a transformer chamber and a low voltage distribution switch chamber. The rated voltage is 10, 35 kV, and the transformer of 1600 kVA and below can be installed. Its characteristics are: small footprint; factory production, fast speed, good quality; fast construction speed, only need the on-site construction foundation; beautiful appearance, can be consistent with the residential community environment; adaptability, interchangeability, It is easy to standardize and serialize; the maintenance workload is small and investment is saved.

Therefore, box-type substations are valued and welcomed both abroad and domestically, and can be widely used. They are very promising electrical equipment and have been widely used in factories, mines, oil fields, ports, airports, stations, and urban public. Construction, centralized residential areas, government agencies, schools, commercial halls and underground facilities.

At present, there are many different types of combined substations in China, including outdoor, indoor, fully enclosed, semi-closed, with corridor type, without corridor type, combined, fixed, and installed. Transformers, oil-immersed transformers, terminal power supply, ring network power supply, etc., can adapt to the needs of different users. The layout of the high-voltage, transformer, and low-voltage three-chamber is a mesh-shaped arrangement or a character-shaped separation scheme. The components of the high-voltage room are selected from imported, domestic or imported ring network cabinets, load switches plus current limiting fuses, and vacuum circuit breakers. The low pressure chamber consists of power, lighting, metering and reactive power compensation cabinets. The ventilation and cooling system is provided with a fan, an automatic temperature controller and an anti-condensation controller. Most of the casings are made of ordinary or hot-dip galvanized steel sheets and aluminum alloy sheets, and the skeleton is welded or bolted with formed steel.