A box-type substation

Abstract

The application relates to a box-type substation, belonging to the technical field of power equipment, which comprises a container and a medium-voltage cabinet arranged in the container, a containing area is arranged on the outer wall of the container, and a communication structure is arranged between the medium-voltage cabinet and the containing area; the application further comprises an arc-discharging channel, the arc-discharging channel is arranged in the containing area, the bottom end of the arc-discharging channel is communicated with the communication structure, and the top end of the arc-discharging channel extends above the outer wall of the container. According to the application, the independent containing area is arranged on the outer wall of the container, the arc-discharging channel is externally installed, the arc-discharging channel is completely physically isolated from the internal equipment, the threat of the arc to the internal equipment is eliminated, the space utilization rate is improved without occupying the equipment layout space in the container, the arc-discharging channel adopts a detachable modular design, users can flexibly select installation according to actual needs, and a foundation arc-discharging pit does not need to be previously constructed, so that the capital construction cost and the engineering complexity are reduced.

Description

Technical Field

[0001] This application relates to the field of power equipment technology, and in particular to a prefabricated substation. Background Technology

[0002] Prefabricated substations integrate low-voltage switchgear, transformers, medium-voltage switchgear, and other equipment into a container, and are widely used in the field of new energy power generation. During operation, the medium-voltage switchgear may experience internal arcing failure. The instantaneous high-temperature, high-voltage arc generated must be safely discharged; otherwise, it will seriously threaten the safety of equipment and personnel.

[0003] Currently, to avoid the dependence on foundation structures in traditional downward arc venting schemes, existing technologies employ upward arc venting schemes. This involves setting up a fixed arc venting channel inside the container, enclosed by the container's inner walls and added partitions, guiding the electric arc to the top of the container for release. However, this scheme still has the following drawbacks: First, the built-in arc venting channel occupies space within the container's equipment layout, reducing space utilization and affecting equipment maintenance and heat dissipation; second, the arc venting channel shares the same compartment with the medium-voltage switchgear, auxiliary components, etc., meaning the high-temperature airflow and debris generated during arc venting still pose a potential threat to all equipment within the compartment, and safety is not completely resolved; furthermore, this channel is a fixed structure with a single function, unable to be flexibly configured or repurposed according to actual needs. Utility Model Content

[0004] To address the problem that built-in arc venting channels in prefabricated substations occupy valuable internal equipment space and cannot eliminate the safety threat of electric arcs to other equipment in the compartment due to their shared location with the medium-voltage switchgear, this application provides a prefabricated substation.

[0005] The prefabricated substation provided in this application adopts the following technical solution: A prefabricated substation includes a container and a medium-voltage switchgear disposed inside the container. The outer wall of the container has a storage area, and the medium-voltage switchgear and the storage area are connected by a communication structure. It also includes an arc-venting channel, which is disposed within the accommodating area. The bottom end of the arc-venting channel is connected to the connecting structure, and its top end extends to the top of the outer wall of the container.

[0006] By adopting the above technical solution, the arc venting channel is accommodated in an independent storage area outside the container, thus realizing the external placement of the arc venting channel and completely physically isolating it from the internal electrical equipment. This completely eliminates the threat of electric arc to the equipment inside the compartment, and does not require occupying the equipment layout space inside the container, thereby improving space utilization. At the same time, this self-arc venting capability frees it from dependence on the pre-prepared arc venting pit in the foundation, simplifies civil construction, and significantly reduces the cost and time of substation construction.

[0007] In one specific implementation, the accommodating area is formed by an inward recess from the outer wall of the container.

[0008] By adopting the above technical solution, space is created by the deformation of the container's own structure, realizing the integrated design of the storage area and the container, ensuring the continuity and overall strength of the storage area and the main structure of the container. This design not only maintains the clean external outline of the container, making it easy to transport and install, but also has the advantage of low manufacturing cost due to the reduction of independent parts and assembly links.

[0009] In one specific implementation, the container is provided with a door, and the accommodating area is located on an outer wall different from the door.

[0010] By adopting the above technical solution, the containment area and the door are located on different side walls, thus optimizing the functional zoning layout. This ensures that when maintenance personnel open the door for daily inspections or operations, their path and operating space will not be obstructed by the containment area and the arc venting channel, thereby improving safety and operational convenience.

[0011] In one specific implementation, the arc-venting channel is detachably installed within the receiving area.

[0012] By adopting the above technical solution, the arc venting channel is installed as an independent functional module. This module is installed for sites that require the highest level of safety. Furthermore, this modular design facilitates later maintenance, replacement, or upgrades. For sites with existing foundation arc venting pits, users can choose not to install the arc venting channel, saving costs and thus improving the configuration flexibility of the prefabricated substation.

[0013] In one specific implementation scheme, the communication structure includes an arc-venting space located at the bottom of the medium-voltage switchgear and a connection port located at the bottom of the accommodating area, wherein the arc-venting space is connected to the connection port.

[0014] By adopting the above technical solution, the arc venting space of the medium-voltage switchgear is directly connected to the connection port of the containment area, forming a smooth and low-resistance arc venting path, ensuring that in the event of an arcing fault, the arc can be quickly and reliably guided to the external arc venting channel.

[0015] In one specific implementation, a cover plate is detachably installed on the connection port.

[0016] By adopting the above technical solution, when the arc venting channel is not required, the cover plate can seal the connection port to prevent dust, rainwater and other foreign objects from entering the medium-pressure cabinet or container through the connection port, thereby ensuring the normal operating environment of the equipment and improving the system's sealing and protection level.

[0017] In one specific implementation scheme, the arc venting channel is a hollow pipe structure with an inlet at its bottom end that communicates with the connection port and an outlet at its top end.

[0018] By adopting the above technical solution, a closed and dedicated channel for arc discharge is provided by the hollow pipe structure, which can constrain the diffusion path of the arc and high-temperature gas and ensure that they are safely guided to the top. The bottom inlet is connected to the connection port, and the top outlet points to the safe area. The structure is simple and the guidance is clear.

[0019] In one specific implementation scheme, an arc-extinguishing flap is movably provided at the outlet of the arc-extinguishing channel.

[0020] By adopting the above technical solution, the arc-extinguishing flap constitutes a simple one-way pressure valve. Under normal circumstances, the flap is closed, which can prevent external foreign objects, rainwater and other substances from flowing back into the arc-extinguishing channel and keep the inside of the arc-extinguishing channel clean and dry. When the high-pressure gas generated by the electric arc impacts, the flap is pushed open to release the electric arc and pressure. The operation is reliable and does not require external power.

[0021] In one specific feasible implementation, the arc venting channel is fitted to the outer wall of the container.

[0022] By adopting the above technical solution, the arc venting channel is installed close to the box wall, which can enhance the stability of the arc venting channel and prevent it from shaking. At the same time, this layout makes the most of the space in the recessed area, making the overall external outline of the box substation more compact, reducing external protrusions and avoiding interference during transportation or installation.

[0023] In one specific implementation, the containment area is also equipped with fire extinguishers and / or maintenance tools.

[0024] By adopting the above technical solutions, the external space of the container can be efficiently reused and its functions integrated, realizing the multi-functional value of the storage area. Furthermore, emergency fire-fighting equipment and maintenance tools can be stored nearby and centrally in this easily accessible area, reducing the need to open the container to retrieve tools. In case of an emergency, maintenance personnel can quickly access them, improving emergency response speed and the safety of maintenance operations.

[0025] In summary, the beneficial technical effects of this application are as follows: By setting up a accommodating area on the outer wall of the container and adopting a detachable and installable independent arc-extinguishing channel, the arc-extinguishing channel is completely externalized. This external accommodating area houses the arc-extinguishing channel, completely physically isolating it from the electrical equipment inside the container. This eliminates the threat of internal arcing faults to critical equipment such as transformers and low-voltage switchgear, improving intrinsic safety. Furthermore, the arc-extinguishing channel does not occupy the equipment layout space inside the container, improving space utilization. At the same time, the modular design provides high configuration flexibility, allowing for the selection of arc-extinguishing functions according to the actual needs of the project, eliminating dependence on foundation arc-extinguishing space, and reducing civil engineering costs and construction period. Furthermore, this design achieves efficient space reuse and functional integration. The storage area is integrally formed by recessing the outer wall of the container and strengthening the structure with an internal frame. While ensuring a compact and rigid overall structure without taking up additional space, it not only provides a stable installation space for the arc venting channel but can also be expanded into a multi-functional safety platform. By integrating fire extinguishers and storing maintenance tools in this area, emergency equipment and materials are placed in an easily accessible location outside the container, optimizing the operation and maintenance process, reducing the risk of opening the container door in emergencies, and thus improving the response speed and operational safety to emergencies. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of the prefabricated substation according to an embodiment of this application.

[0027] Figure 2 It is a schematic diagram used to show the positional relationship between low-pressure chambers, high-pressure chambers, and intermediate-pressure chambers.

[0028] Figure 3 This is a structural diagram used to illustrate the arc discharge channel and the containment area.

[0029] Figure 4 This is a schematic diagram showing the structure of the containment area and arc-venting channel located on the outer wall of side A of the container. Figure 5 yes Figure 4 Enlarged view of section A.

[0030] Figure 6 This is a schematic diagram showing the structure of the containment area and arc-venting channel located on the outer wall of side B of the container. Figure 7 yes Figure 6 Enlarged view of section B in the middle.

[0031] Figure 8 This is a structural diagram used to demonstrate a prefabricated substation without an arc-venting channel installed.

[0032] Explanation of reference numerals in the attached drawings: 1. Container; 11. Storage area; 12. Low-pressure compartment; 13. High-pressure compartment; 14. Medium-pressure compartment; 2. Medium-pressure switchgear; 3. Transformer; 4. Low-pressure switchgear; 5. Arc venting channel; 51. Exit; 6. Connecting structure; 61. Arc venting space; 62. Connection port; 7. Cover plate; 8. Frame structure; 81. Base channel steel; 82. Top crossbeam; 83. Left side column; 84. Right side column; 9. Fire extinguisher. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0034] The containerized substation of this application consists of three compartments: a low-pressure compartment, a high-pressure compartment (transformer compartment), and a medium-pressure compartment. The main equipment inside includes a ring main unit (i.e., medium-pressure cabinet) for medium-pressure power distribution, a transformer, a low-pressure cabinet, and auxiliary equipment that provides control, monitoring, lighting, and ventilation for the interior of the container. The compartments are separated by partitions to meet different protection and safety level requirements.

[0035] In this application, doors are engraved at both ends of the container. The container's pressure compartment has three outer walls, one of which has a door. Of the other two outer walls, one side is designated as side A and the other side as side B. In this embodiment, the door is located on the left side of the pressure compartment, meaning that side A and side B constitute the front and rear sides of the pressure compartment. The pressure cabinet is placed inside the pressure compartment, and its installation orientation determines whether it is closer to side A or side B.

[0036] Example 1 Reference Figure 1 and Figure 2 This application discloses a prefabricated substation, including a container 1, a medium-voltage switchgear 2 installed inside the container 1, and an arc venting channel 5 installed on the outer wall of the container 1.

[0037] Container 1 is constructed of a steel frame and wall panels. The interior is divided into a low-pressure compartment 12, a high-pressure compartment 13, and a medium-pressure compartment 14 by partitions. The medium-pressure cabinet 2 is located in the medium-pressure compartment 14, which includes an electrical box, a mechanism room, a cable room, etc., which will not be described in detail here.

[0038] Reference Figure 3-5 In this embodiment, the installation position of the medium-pressure cabinet 2 inside the container 1 is close to the A side of the container 1; that is, the distance between the side of the medium-pressure cabinet 2 facing the A side and the inner wall of the A side of the container 1 is less than the distance between its opposite side and the inner wall of the B side of the container 1.

[0039] A accommodating area 11 is provided on the outer side wall of side A of container 1. In this embodiment, the accommodating area 11 is provided in correspondence with the medium-pressure compartment 14, and the accommodating area 11 is provided on the outer side wall that is different from the door of container 1. In this embodiment, the accommodating area 11 is formed by stamping, bending and other processes on the outer wall of side A of container 1, so that it is partially recessed inward to form a space that is enclosed on three sides and connected to the interior of container 1 on one side. This one-piece molding design can ensure the integrity and sealing of the structure, and does not require increasing the overall external projection size of container 1, thus maintaining the compactness of the structure.

[0040] To ensure sufficient rigidity and strength of the recessed structure, a frame structure 8 is added to the outer wall of side A of container 1 to form a enclosure. Specifically, the frame structure 8 includes a base channel steel 81 fixed to the bottom of the recessed area, a top crossbeam 82 fixed to the top, and a left column 83 and a right column 84 fixed to both sides. The frame structure 8 can enhance the overall rigidity and load-bearing capacity of the accommodating area 11, enabling it to support heavy equipment more stably and preventing the recessed part of container 1 from deforming or fatigued due to vibration, wind load or load during long-term use or transportation.

[0041] To ensure the safe discharge of electric arc, a connecting structure 6 is provided between the medium-voltage cabinet 2 and the containment area 11. Specifically, the connecting structure 6 includes an arc-dissipating space 61 (e.g., a cable compartment or a dedicated arc-dissipating chamber at the bottom of the medium-voltage cabinet 2) and a connection port 62 at the bottom of the containment area 11. By installing the medium-voltage cabinet 2 close to the containment area 11, the arc-dissipating space 61 and the connection port 62 are aligned and connected in space, thereby forming a discharge path from inside the cabinet to outside the cabinet.

[0042] To ensure flexibility, a cover plate 7 is detachably installed on the connection port 62, including but not limited to being detachably installed by screws. The cover plate 7 is made of steel plate with sealing strips embedded on the edges. When the arc venting channel 5 is not installed, the cover plate 7 is used to seal the connection port 62, which can effectively prevent dust, moisture and foreign objects from entering.

[0043] The arc venting channel 5 is detachably installed in the receiving area 11. In this embodiment, the arc venting channel 5 can be fixedly installed on the container by bolts and flanges.

[0044] In this embodiment, the arc venting channel 5 includes, but is not limited to, an integrally formed rectangular hollow pipe structure. It should be noted that the function of the arc venting channel 5 is to form a channel that can guide the electric arc to a safe area for release, and its specific structure is not limited to that shown in this embodiment. In other embodiments, its structure can also be a modular splicing type, for example, it can be formed by connecting multiple pipe sections through flanges. Its overall shape can be a straight pipe or a pipe structure with a certain bending angle. Its cross-section can also be circular, elliptical or other regular and irregular shapes. Furthermore, the general concept of arc venting channel 5 is not limited to the form of a pipe. Its core function is to construct a path for guiding and confining the electric arc. Therefore, any guiding structure that can achieve this function falls within the scope of consideration of this embodiment. For example, it can be an open guide channel formed directly in the accommodating area 11 by adding a guide plate, or a flexible guide body formed by wrapping it with an arc-resistant material, or a cavity channel formed by an independent cover fixedly connected to the outer shell of container 1 and enclosed by the container wall.

[0045] The length of the arc venting channel 5 is customized according to the height of the container 1, and its top extends to the top of the outer wall of the container 1. In this embodiment, the top of the arc venting channel 5 may be lower than or higher than the top of the container 1, or it may be flush with the top of the container 1. The bottom end of the arc venting channel 5 is machined with an inlet, and the top end is machined with an outlet 51. The bottom inlet is connected to the connection port 62 of the accommodating area 11 (the cover plate 7 has been removed). In this embodiment, a sealing structure is provided between the bottom inlet of the arc venting channel 5 and the connection port 62 of the accommodating area 11.

[0046] Reference Figure 4 and Figure 5 In this embodiment, the arc venting channel 5 is fitted to the outer wall of the A side of the container 1, thereby enhancing the stability of the arc venting channel 5, preventing it from shaking, and maximizing the use of the space of the accommodating area 11, making the external outline of the box-type substation extremely compact.

[0047] Reference Figure 3 To further enhance safety, an arc-extinguishing flap is movably installed at the top outlet 51 of the arc-extinguishing channel 5. The arc-extinguishing flap is, but is not limited to, connected to the upper part of the outlet 51 by a hinge. The arc-extinguishing flap constitutes a one-way pressure valve, which is closed under normal circumstances to prevent rainwater and dust from flowing back in. When the high-pressure gas generated by the electric arc impacts, the arc-extinguishing flap opens upward under the electric arc pressure to release the pressure and the electric arc.

[0048] In this embodiment, to ensure safety, a limiting component, such as a chain or a limiting block (not shown in the figure), can be set to limit the maximum opening angle of the arc-extinguishing flap, preventing it from being damaged or affecting the surrounding environment after it is fully opened.

[0049] Reference Figure 3 In addition, fire extinguishers 9 and / or maintenance tools (not all shown in the figure) are installed in the storage area 11. In this embodiment, the storage area 11 is provided with installation structures, such as brackets welded to the frame, tool hanging plates or drawers, for installing fire extinguishers 9 and / or storing maintenance tools. This design externalizes the emergency equipment. In the event of a fire or malfunction, maintenance personnel can quickly retrieve fire extinguishers 9 from outside the box for rescue without having to risk opening the box door, which greatly improves safety and emergency response efficiency.

[0050] In this embodiment, emergency lighting, status indicator lights, grounding wire terminals, etc. (not shown in the figure) can also be installed in the containment area 11; the containment area 11 is upgraded from a simple arc discharge channel 5 installation platform to a comprehensive external safety workstation that integrates safe discharge, emergency fire protection, status monitoring, safe grounding, and tool storage, thereby improving the safety and efficiency of operation and maintenance.

[0051] When a short circuit occurs inside the intermediate pressure cabinet 2 and a high-temperature electric arc is generated, its working process is as follows: An electric arc is generated in the arc-venting space 61 at the bottom of the medium-pressure cabinet 2, releasing huge energy instantly, causing the gas pressure inside the cabinet to rise sharply; the high-temperature and high-pressure electric arc and free gas, driven by pressure, quickly pass through the connecting structure 6, that is, from the arc-venting space 61 of the medium-pressure cabinet 2 through the connection port 62 and rush outward. The electric arc then enters the bottom inlet of the arc venting channel 5 and propagates upward at high speed along the hollow pipe structure. When the high-pressure airflow reaches the top outlet 51 of the pipe, it breaks open the arc venting flap, and the electric arc and high-temperature free gas are sprayed from the outlet 51 into the air on top of the container 1, where they are cooled, elongated and dissipated.

[0052] After the pressure inside the cabinet is released, the arc-relieving flap automatically falls back under the action of gravity, reclosing outlet 51 and restoring its sealed state to prevent foreign objects from entering. The entire release process is completed outside container 1, achieving complete physical isolation from equipment such as transformer 3 and low-voltage cabinet 4 inside.

[0053] The prefabricated substation disclosed in this embodiment achieves the following technical effects through the above-described specific structural design: 1. By placing the arc venting channel 5 completely outside the container 1 in an independent storage area 11, complete physical isolation from internal electrical equipment (such as transformer 3 and low-voltage cabinet 4) is achieved. When the medium-voltage cabinet 2 experiences an internal arcing failure, the high-temperature arc and high-pressure gas are directly guided to the outside of the container for high-altitude venting, eliminating the risk of arc burning and explosion to other critical equipment inside the compartment, improving the intrinsic safety level of the prefabricated substation, and the arc venting channel 5 does not occupy the equipment layout space inside the container, thus improving space utilization.

[0054] 2. This design no longer relies on pre-built foundation arc venting pits, simplifying civil engineering requirements and significantly reducing the total cost and time of power plant construction; at the same time, the arc venting channel 5 adopts a detachable modular design, allowing users to flexibly choose whether to install it according to the actual foundation conditions of the project, providing configuration flexibility.

[0055] 3. The housing area 11 is integrally formed by recessing into the outer wall of container 1, without the need to increase the overall external projection size of container 1, thus maintaining the compactness of the prefabricated substation structure and facilitating transportation and on-site layout.

[0056] 4. Fire extinguishers 9, maintenance tools and other emergency equipment are integrated into the external storage area 11 of the box. In case of emergency, maintenance personnel can safely and quickly access the equipment from outside the box without having to risk opening the box door, thus improving the speed of emergency response and the safety of maintenance operations.

[0057] 5. The removable cover plate 7 ensures the sealing protection level (IP rating) of container 1 when it is not in the arc-venting state, preventing foreign objects from entering; the arc-venting flap structure constitutes an automatic one-way pressure valve that does not require external power. Under normal conditions, it is sealed and waterproof, and automatically opens to release pressure in the event of an explosion, with reliable operation.

[0058] Example 2 This embodiment shares the same core principles and structural details as Embodiment 1 (for specific structure, please refer to...). Figure 1-3 ); reference Figure 6 and Figure 7 The difference lies in the relative position of the accommodating area 11 and the medium-pressure cabinet 2. This embodiment shows the case where the accommodating area 11 and the arc venting channel 5 are located on the outer side wall of the B side of the container 1.

[0059] In this embodiment, the installation position of the medium-pressure cabinet 2 inside the container is adjusted to be close to the B side of the container 1; that is, the distance between the side of the medium-pressure cabinet 2 facing the B side and the inner wall of the B side of the container 1 is less than the distance between its opposite side and the inner wall of the A side of the container 1.

[0060] Correspondingly, the accommodating area 11 is located on the outer wall of the B side of the container 1. The accommodating area 11 is formed by the outer wall of the B side of the container 1 through processes such as stamping and bending, so that it is partially recessed inward to form a space that is enclosed on three sides and connected to the interior of the container 1 on one side. In this embodiment, the medium-pressure cabinet 2 has an arc-venting space 61 on the side near the B side, which is connected to the connection port 62 at the bottom of the accommodating area 11 on the B side.

[0061] Other technical features, such as the structure of the accommodating area 11, the frame structure 8, the arc venting channel 5, the arc venting flap, and the multi-functional design of the fire extinguisher 9 and maintenance tools, are the same as in Embodiment 1.

[0062] This embodiment provides greater flexibility in the overall layout planning of the prefabricated substation. Users can freely choose to place the arc discharge channel 5 and the multi-functional accommodating area 11 on side A or side B according to the overall structural scheme of the prefabricated substation, equipment layout optimization, and specific actual needs such as the installation site, without affecting the realization of its core functions.

[0063] Example 3 This embodiment optimizes the installation method of the arc-venting channel 5 based on embodiment one or two, specifically: The accommodating area 11 is provided with a pair of vertical guide rails (not shown in the figure). The vertical guide rails are installed on the outer side wall (A side or B side) of the container 1. The arc venting channel 5 is provided with a sliding part (not shown in the figure) that cooperates with the guide rails. The arc venting channel 5 is slidably installed in the accommodating area 11 through the cooperation of the sliding part with the guide rails. The outer wall of container 1 (A side or B side) is also provided with locking components for locking the arc venting channel 5 in the installation position, including but not limited to screws, quick-release locking handles and other structures; by adopting the above installation method, the installation and disassembly process of the arc venting channel 5 can be simplified, making it modular and convenient for transportation and later maintenance.

[0064] Example 4 Reference Figure 8 This embodiment demonstrates the usage state of the containment area 11 without the installation of the independent arc venting channel 5. Specifically, when the prefabricated substation is installed on a site where an arc venting pit has been pre-constructed, the arc venting channel 5 can be omitted. In this case, the connection port 62 on the outer wall of the container 1 is closed by the cover plate 7, so that the connection port 62 of the containment area 11 is in a tightly sealed state to ensure the airtightness of the container 1.

[0065] In this embodiment, the entire space of the accommodating area 11 is used entirely as an external storage platform, and more tools can be mounted on the accommodating area 11.

[0066] This embodiment expands the application adaptability and functional extension of the prefabricated substation of this application. The storage area 11 serves as a multi-functional basic platform. Users can flexibly choose to configure it as a safe arc venting mode (with arc venting channel 5 installed) or a pure storage mode according to the actual needs of the project, so as to realize the efficient reuse and functional customization of the outer space of the container 1, and significantly improve the practicality and economy of the product.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated substation, characterized in that: It includes a container and a medium-pressure cabinet located inside the container. The outer wall of the container is provided with a storage area, and the medium-pressure cabinet and the storage area are connected by a communication structure. It also includes an arc-venting channel, which is disposed within the accommodating area. The bottom end of the arc-venting channel is connected to the connecting structure, and its top end extends to the top of the outer wall of the container.

2. The prefabricated substation according to claim 1, characterized in that: The accommodating area is formed by an inward indentation from the outer wall of the container.

3. The prefabricated substation according to claim 1, characterized in that: The container is equipped with a door, and the accommodating area is located on the outer wall, which is different from the door.

4. The prefabricated substation according to claim 1, characterized in that: The arc-venting channel can be detachably installed within the accommodating area.

5. The prefabricated substation according to claim 1, characterized in that: The communication structure includes an arc-venting space located at the bottom of the medium-pressure cabinet and a connection port located at the bottom of the accommodating area, wherein the arc-venting space is connected to the connection port.

6. The prefabricated substation according to claim 5, characterized in that: A cover plate can be detachably installed on the connection port.

7. The prefabricated substation according to claim 5, characterized in that: The arc-venting channel is a hollow pipe structure with an inlet at its bottom that communicates with the connection port and an outlet at its top.

8. The prefabricated substation according to claim 7, characterized in that: An arc-extinguishing flap is movably provided at the outlet of the arc-extinguishing channel.

9. The prefabricated substation according to claim 1, characterized in that: The arc-venting channel is fitted to the outer wall of the container.

10. The prefabricated substation according to claim 1, characterized in that: The containment area is also equipped with fire extinguishers and / or maintenance tools.

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