Pre-installed substation, also known as pre-installed substation or box substation, is a highly integrated distribution equipment. It is mainly composed of high-voltage switchgear, distribution transformer, low-voltage switchgear and other necessary auxiliary equipment, which are pre-assembled in one or more steel box according to a specific wiring scheme. The main features of pre-installed substation are as follows:

High integration: integrating multiple power equipment into one or more boxes realizes the organic combination of transformer step-down and low-voltage power distribution, and greatly improves the completeness and compactness of power distribution equipment.

Prefabricated production: the equipment is prefabricated, assembled and debugged in the factory, which reduces the workload and difficulty of on-site construction and shortens the construction period. At the same time, the factory production mode also ensures the quality and reliability of the equipment.

Modular design: the pre-installed substation adopts modular design, and each component can be manufactured, tested and assembled separately, which is convenient for equipment maintenance and upgrading. At the same time, the modular design also improves the flexibility and expansibility of the equipment.

Excellent protective performance: the box body adopts fully enclosed structure, which has multiple protective functions such as moisture-proof, rust-proof, dust-proof, rat-proof, fire-proof, theft-proof and heat insulation, ensuring the stable operation of the equipment in various harsh environments.

Small floor space: Due to the high integration of equipment, the pre-installed substation occupies a small floor space, which is suitable for use in urban central areas, industrial parks, residential quarters and other places with tight land resources.

High degree of automation: Pre-installed substation is usually equipped with advanced automatic control system, which realizes remote monitoring and intelligent control of equipment and improves the reliability and efficiency of distribution system.

Convenient movement: some pre-installed substations are designed to be movable, which is convenient for quick relocation and redeployment between different locations.

Pre-installed substations are widely used in urban power grid construction and transformation, industrial parks, residential quarters, commercial centers, transportation hubs, mines, factories and enterprises, oil and gas fields, wind power stations and other occasions. It has changed the construction mode of traditional substation, improved the reliability and efficiency of distribution system, and reduced the cost of construction and operation and maintenance. It is an indispensable and important equipment in modern power system.