Prefabricated Cabin-type Substation
1. Advantages of prefabricated substations
1. Reduce the difficulty of project construction management. 2. Reduce on-site construction and floor space. 3. The construction period of the site is short, and the time cost is reduced. 4. Reduce the amount of on-site engineering construction. 5. The equipment in the cabin has a better operating environment.
2. Cabin structure
The cabin body combines the light steel structure with the container structure, the frame is made of square steel profiles, the corrugated boards are laid between the profiles, and the whole is welded and formed. Because the corrugated board has good mechanical properties in all directions of space, when the cabin is subjected to external loads, not only does the frame structure play a bearing role, but the corrugated board as a wall structure can also play an auxiliary bearing role, which can effectively improve the cabin's performance. strength and load-carrying capacity.
3. Cabin sealing and protection level
The prefabricated cabin adopts an integral welding structure, and the external welding seams are fully welded, which can effectively avoid the entry of external moisture, dust and rainwater, and improve the protection level of the cabin body, and the protection level of the cabin body can reach IP54.
4. Cluster bus design, centralized interface design
A gridded internal line system is arranged inside the modular secondary equipment, covering all internal equipment. The internal bus system can be prefabricated in the rack according to the design. Through standardized design, the branch system of the internal bus can have standardized interfaces. Each module adopts prefabricated optical cables and prefabricated cables, combined with aviation plugs and fusion-free optical distribution, centralized interface design, on-site wiring "plug and play", fast and efficient wiring. The DC cable connection between the screens is cancelled, the DC bus bar is set on the top of the rack, and the integrated device of the air switch and the aviation plug is used to realize the simple connection between the power cable bus and the air switch, and the integrated design and installation with the cabin body realizes the modularization of secondary "Plug and Play" for the power interface of the device.
5. Structural design and grounding design of rack-mounted cabinets
The structure design of "rack-type rotating cabinet" is adopted, the side door and rear door of the cabinet are eliminated, and the cabin body, frame and equipment are integrated and fixed. Only a few parts and a small number of auxiliary connectors are needed to complete the construction of the entire rack. The space between the cabinets completes the line, expands the operation and maintenance space in the cabin, and improves the integration of cabin equipment. According to the requirements of GB17467-2010 "High Voltage/Low Voltage Prefabricated Substation", the prefabricated substation has two main grounding methods. One is that the equipment in the cabin is connected to the grounding grid in the station through the cabin body (Note: The cabin body must be a metal structure ), and the second is that the equipment and the cabin are independently grounded.
6. High-altitude, high-cold area design
The wall and the top adopt an inner and outer two-layer thermal insulation structure to realize sandwich wall panels, forming an air space in the middle of the wall, and innovatively adding aluminum foil material to use its high reflection and low emission characteristics to improve the thermal insulation performance of the cabin and reduce the number of days and nights. The effect of temperature difference on the cabin environment. The wood-based ceramic anti-static floor with thermal insulation effect is adopted; the roof slope is increased to reduce the impact of rainfall and hail weather on the cabin.
7. Design for dusty environment
For dust-prone areas, in order to prevent sand and dust from entering the cabin and affecting the operation of the equipment, multiple dust-proof measures such as dust-proof nets, dust-proof cotton, and protective covers are installed outside the cabin. In addition, considering the regional environment, a sealed cabin can be set up, and a buffer zone can be set up for the cabin environment to prevent the direct influx of external sand and dust. At the same time, this design scheme can also prevent the external high-humidity and high-heat air from entering the cabin.