Combined box substation
Overview
Box-type substation is also called prefabricated substation or prefabricated substation. It is a kind of 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 plan. It organically combines the functions of transformer step-down and low-voltage power distribution. Together, it is installed in a moisture-proof, rust-proof, dust-proof, rodent-proof, fire-proof, anti-theft, heat-insulated, fully enclosed, movable steel structure box. It is especially suitable for the construction and transformation of urban power grids. It is a new type of steel structure box that has emerged after civil engineering substations. A brand new substation. Box-type substation is suitable for mines, factories, enterprises, oil and gas fields and wind power stations. It replaces the original civil distribution rooms and distribution stations and becomes a new complete set of power transformation and distribution devices.
In recent years, the load density of low-voltage power supply has continued to increase, which has also placed high demands on the reliability and quality of power supply. In this case, if a large-capacity substation is used as the center to supply power to surrounding users at low voltage, a large amount of non-ferrous metals will be consumed, the power loss will be large, and the quality of power supply cannot be guaranteed. On the contrary, if high voltage is used deep into the load center and a substation is built in the load center, the radius of low-voltage power supply can be shortened, the quality of power supply can be improved, non-ferrous metals can be saved, and power loss can be reduced. It is most suitable to build a box-type substation in the load center.
High-voltage/low-voltage prefabricated box-type substations (stations) are also called box-type substations or combined substations (combined box-type substations), complete sets of substations, and movable substations. They were produced in the 1970s and have been developed domestically. There are several manufacturers producing it. Its structure is generally a box structure, with three parts: a high-voltage switch compartment, a transformer compartment and a low-voltage distribution switch compartment. The rated voltage is 10 and 35kV, and transformers of 1600kVA and below can be installed. Its characteristics are: small footprint; factory production, fast speed and good quality; fast construction speed, only the basic part of on-site construction is required; beautiful appearance, can be coordinated with the residential community environment; strong adaptability, interchangeability, It is convenient for standardization and serialization; the maintenance workload is small and investment is saved.
Therefore, box-type substations are valued and welcomed both at home and abroad, and can be widely used. They are very promising electrical equipment and have been widely used in factories, mines, oil fields, ports, airports, stations, urban public buildings, etc. Construction, concentrated residential areas, government agencies, schools, commercial halls and underground facilities and other places.
At present, there are many different types of combined substations in China, including outdoor, indoor, fully enclosed, semi-enclosed, with corridors, without corridors, combined, fixed, installed, dry Type transformers, oil-immersed transformers, terminal power supply, ring network power supply, etc., which can meet the needs of different users. The three rooms of high voltage, transformer and low voltage are arranged in an eye-shaped arrangement or a vertical-shaped separation scheme. The equipment components of the high-voltage chamber are imported, domestically produced or imported ring network cabinets, load switches plus current-limiting fuses and vacuum circuit breakers. The low-voltage room is composed of power, lighting, metering and reactive power compensation cabinets. Ventilation and heat dissipation are equipped with fans, automatic temperature controllers, and anti-condensation controllers. Most box shells are made of ordinary or hot-dip galvanized steel plates or aluminum alloy plates, and the frames are welded with formed steel or connected with bolts.
