A high current air insulated switchgear

Abstract

A kind of high current air-insulated switchgear, including switch cabinet body and its inside cable chamber, the inside of switch cabinet body is equipped with reinforcing framework, the side of reinforcing framework is hingedly connected with the cable chamber cover plate matched with the inner wall of cable chamber by multiple hinges, the outside wall of cable chamber cover plate is threadedly connected with the outside wall of reinforcing framework by multiple fixed bolts, since the utility model is by setting explosion-proof plate in cable chamber cover plate, and storing fire extinguishing agent under vacuum condition inside explosion-proof plate, combining with the design of one-way valve triggered by pressure, explosion risk caused by arc fault in cable chamber can be effectively coped with, when the pressure in cable chamber increases sharply, one-way valve opens automatically, fire extinguishing agent sprays out quickly, and timely extinguishes fire, prevent explosion shock wave and high-temperature gas from causing harm to surrounding equipment and personnel, cooperate reinforcing framework and multiple point fixed bolt and firmly install cable chamber cover plate on switch cabinet body, the stability and explosion-proof performance of overall structure are enhanced.

Description

Technical Field

[0001] This utility model relates to the technical field of high-voltage switchgear, specifically to a high-current air-insulated switchgear. Background Technology

[0002] Air-insulated switchgear, a widely used electrical device in power systems, is primarily used for circuit control and protection. Its core principle is to utilize air as an insulating medium, using switching elements to achieve circuit switching. Due to its simple structure, low cost, and convenient maintenance, this type of switchgear is widely used in medium and low-voltage power distribution systems, especially in high-current transmission scenarios, where it effectively meets the power system's requirements for equipment reliability and economy. However, as the power system's requirements for equipment safety and reliability continue to increase, the safety protection issues of existing air-insulated switchgear in the face of arc faults are becoming increasingly prominent.

[0003] Currently available air-insulated switchgear may explode during arc faults, especially in cable compartments. The high temperature and high pressure gases generated by arc faults can cause a sharp increase in internal pressure, leading to an explosion. Existing technologies typically use cable compartment covers for protection to prevent the explosion from escalating. However, this protection measure has significant drawbacks: firstly, the protective capacity of cable compartment covers is limited and cannot effectively withstand the impact of high-intensity arc faults; secondly, existing switchgear lacks effective early warning and active protection mechanisms when arc faults occur, making it impossible to detect faults and take timely measures. This is particularly true in high-current air-insulated switchgear, where the current density is high and the arc energy is even higher, requiring more stringent safety protection. Existing technologies lack sufficient adjustment capabilities for arc fault safety protection functions, failing to meet the higher safety protection requirements of high-current air-insulated switchgear. There is an urgent need for a new protection technology that can effectively prevent arc faults and reduce the scope of accident impact. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the fact that the existing air-insulated switchgear has inadequate safety protection measures against arc faults and is insufficient to provide explosion-proof safety, and needs to be improved.

[0005] The technical solution adopted to solve the above technical problems is:

[0006] A high-current air-insulated switchgear includes a switchgear body and an internal cable compartment. A reinforcing frame is installed inside the switchgear body. One side of the reinforcing frame is hinged to a cable compartment cover plate that matches the inner wall of the cable compartment via multiple hinges. The outer wall of the cable compartment cover plate is threadedly connected to the outer wall of the reinforcing frame via multiple fixing bolts. An explosion-proof plate is installed inside the cable compartment cover plate. The explosion-proof plate stores a fire extinguishing agent under vacuum conditions. A one-way valve connected to the fire extinguishing agent is located on one side of the explosion-proof plate. When an explosion occurs inside the cable compartment, the resulting pressure increases rapidly, controlling the one-way valve to open and extinguish the fire.

[0007] As a preferred embodiment of this utility model, the one-way valve includes a piston sealing seat installed inside the explosion-proof plate. A piston rod is movably installed inside the piston sealing seat. An impact plate is connected to the outer end of the piston rod, and a sealing block is connected to the inner end of the piston rod. A nozzle and a vent are respectively provided on the side of the piston rod near the outer end and the inner end. When the pressure is high enough, the impact plate and the piston rod are pushed to move along the inner wall of the piston sealing seat, thereby connecting the inside of the explosion-proof plate with the outside.

[0008] As a preferred embodiment of this utility model, a limiting spring is connected to one side of the piston rod, and the other end of the limiting spring is connected to the piston sealing seat. By limiting the position of the limiting spring, the sealing of the vacuum inside the explosion-proof plate under normal conditions is ensured, and the leakage of the medium is prevented.

[0009] As a preferred embodiment of this utility model, a sealing frame is installed inside both the cable compartment cover and the explosion-proof plate. An explosion-proof mesh is connected inside the sealing frame. Explosion-proof glass of sufficient thickness is provided on both the inner and outer sides of the explosion-proof mesh and is connected inside the corresponding cable compartment cover and explosion-proof plate.

[0010] As a preferred embodiment of this utility model, an input head is installed on one side of the explosion-proof plate, and one end of the inner side of the input head is connected to the inner wall of the explosion-proof plate for inputting fire extinguishing medium.

[0011] As a preferred embodiment of this utility model, the outer wall of the cable compartment cover is connected to a protective plate by a second bolt, and a lighting lamp is connected inside the protective plate for internal lighting, which is used in conjunction with the explosion-proof glass.

[0012] As a preferred embodiment of this utility model, the inner wall of the cable chamber cover is connected to a first sealing gasket, and a second sealing gasket is provided at the edge of the cable chamber near the opening, with the second sealing gasket and the first sealing gasket being matched in size.

[0013] The beneficial effects of this utility model are as follows:

[0014] I. Effectively enhance safety protection performance

[0015] This utility model effectively addresses the risk of explosion caused by arc faults in cable compartments by installing an explosion-proof plate inside the cable compartment cover and storing extinguishing agent under vacuum conditions inside the explosion-proof plate. Combined with a pressure-triggered one-way valve design, it can effectively deal with the risk of explosion caused by arc faults in cable compartments. When the pressure in the cable compartment increases sharply, the one-way valve opens automatically, and the extinguishing agent is sprayed out quickly to extinguish the flame in time, preventing the explosion shock wave and high-temperature gas from causing damage to surrounding equipment and personnel. With the help of a reinforced frame and multi-point fixing bolts, the cable compartment cover is firmly installed on the switch cabinet body, which enhances the overall structural stability and explosion-proof performance.

[0016] Meanwhile, the design of the explosion-proof plate and sealing frame further enhances the sealing of the cable compartment, preventing the leakage of sparks and particles generated during an explosion, avoiding the occurrence of a larger fire, significantly improving the safety protection performance of the switchgear, and meeting the high safety requirements of high-current air-insulated switchgear.

[0017] II. Optimize structural design and ease of maintenance

[0018] This utility model, through the design of the piston sealing seat and limit spring inside the explosion-proof plate, ensures the sealing performance of the one-way valve under normal conditions, preventing the leakage of extinguishing agent, and at the same time, it can quickly respond and release the extinguishing agent when needed. The sealing gaskets on the inner and outer sides of the cable compartment cover further enhance the sealing effect and are made of high-temperature resistant materials, which improves the reliability and durability of the equipment.

[0019] In addition, the design of the protective panels and lighting not only facilitates daily inspections and maintenance, but also enables real-time observation of the internal conditions through the explosion-proof glass, improving the convenience of equipment maintenance and operational reliability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the main cross-sectional structure of the present utility model;

[0022] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the explosion-proof plate of this utility model;

[0023] Figure 4 This is a side view of the structure of this utility model.

[0024] In the diagram: 1. Switchgear body; 2. Cable compartment; 3. Cable compartment cover; 4. Reinforcing frame; 5. Hinge; 6. First sealing gasket; 7. Fixing bolt; 8. Explosion-proof plate; 9. Fire extinguishing agent; 10. Impact plate; 11. Piston sealing seat; 12. Sealing block; 13. Piston rod; 14. Input head; 15. Sealing frame; 16. Explosion-proof mesh; 17. Lighting lamp; 18. Protective plate; 19. Second sealing gasket. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0028] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0030] Example 1

[0031] exist Figures 1-4This utility model provides a technical solution: a high-current air-insulated switchgear, including a switchgear body 1 and a cable compartment 2 inside it. A reinforcing frame 4 is installed inside the switchgear body 1. One side of the reinforcing frame 4 is hinged to a cable compartment cover 3 that matches the inner wall of the cable compartment 2 via multiple hinges 5. The outer wall of the cable compartment cover 3 is threadedly connected to the outer wall of the reinforcing frame 4 via multiple fixing bolts 7. By setting the reinforcing frame 4 inside the switchgear body 1, the overall safety and stability of the cabinet are enhanced, and the cable compartment cover 3 is also fixed to the reinforcing frame 4. The explosion-proof performance of the cover plate has been further improved, enhancing safety. The cable chamber cover plate 3 is equipped with an explosion-proof plate 8 inside, which stores extinguishing agent 9 under vacuum conditions. One side of the explosion-proof plate 8 is connected to a one-way valve that communicates with the inside of the extinguishing agent 9. When an explosion impact occurs inside the cable chamber 2, the pressure increases sharply, controlling the one-way valve to open and extinguish the fire. It should be noted that the one-way valve here can be a pressure one-way valve in the prior art, usually used in equipment such as fire tanks to automatically release pressure when the internal pressure exceeds a set value, preventing damage to the equipment due to overpressure, thereby achieving the fire extinguishing principle.

[0032] In one aspect of this embodiment, the one-way valve includes a piston sealing seat 11 installed inside the explosion-proof plate 8. A piston rod 13 is movably mounted inside the piston sealing seat 11. An impact plate 10 is connected to the outer end of the piston rod 13, and a sealing block 12 is connected to the inner end of the piston rod 13. A nozzle and a vent are respectively provided on the inner side of the piston rod 13 near the outer and inner ends. When the pressure is sufficiently high, it pushes the impact plate 10 and the piston rod 13 to move along the inner wall of the piston sealing seat 11, thereby allowing the interior of the explosion-proof plate 8 to communicate with the outside through the nozzle and the vent, thus enabling the vacuum-stored extinguishing valve to... The fire extinguishing medium is rapidly injected into the interior of the cable chamber 2 through the nozzle and vent to extinguish the fire in time and prevent the fire from spreading. One side of the piston rod 13 is connected to a limit spring, and the other end of the limit spring is connected to the piston sealing seat 11. The limit spring ensures the sealing of the vacuum inside the explosion-proof plate 8 under normal conditions and prevents the medium from leaking out. An input head 14 is installed on one side of the explosion-proof plate 8. One end of the inner side of the input head 14 is connected to the inner wall of the explosion-proof plate 8 for inputting the fire extinguishing medium. The fire extinguishing medium is configured according to the actual situation, such as dry fire extinguishing agent, foam fire extinguishing agent, etc.

[0033] The outer wall of the cable compartment cover 3 is connected to a protective plate 18 by a second bolt. The interior of the protective plate 18 is connected to a lighting lamp 17 for internal lighting. It is used in conjunction with the explosion-proof glass. The internal situation can be observed through the explosion-proof mesh 16 through the explosion-proof glass. The lighting lamp makes it easier to observe and conduct daily patrols.

[0034] In one aspect of this embodiment, a sealing frame 15 is installed inside the cable compartment cover 3 and the explosion-proof plate 8. An explosion-proof mesh 16 is connected inside the sealing frame 15. Both the inner and outer sides of the explosion-proof mesh 16 are provided with explosion-proof glass of sufficient thickness and are connected inside the corresponding cable compartment cover 3 and explosion-proof plate 8.

[0035] In one aspect of this embodiment, a first sealing gasket 6 is connected to the inner wall of the cable chamber cover plate 3, and a second sealing gasket 19 is provided at the edge of the cable chamber 2 near the opening. The second sealing gasket 19 and the first sealing gasket 6 are of the same size. The first sealing gasket 6 and the second sealing gasket 19 are used to further enhance the internal sealing of the cable chamber 2, preventing sparks and other particles from leaking out during an explosion and causing a larger fire. The sealing gaskets are all made of high-temperature resistant materials.

[0036] The working principle of this utility model is as follows: The installation process of this device consists of the following main steps:

[0037] First, the cable compartment cover 3 is firmly installed on the reinforcing frame 4 of the switch cabinet body 1 by multiple fixing bolts 7 to ensure the stability of the cover. The inner wall of the cable compartment cover 3 is connected with a first sealing gasket 6, and a second sealing gasket 19 is provided at the edge of the cable compartment 2 near the opening. The two fit together tightly to further enhance the sealing of the inside of the cable compartment 2 and prevent gas leakage or external impurities from entering.

[0038] Preparation of explosion-proof panels and fire extinguishing agents

[0039] The cable compartment cover 3 is equipped with an explosion-proof plate 8, which stores extinguishing agent 9 under vacuum conditions. One side of the explosion-proof plate 8 is connected to a one-way valve that communicates with the inside of the extinguishing agent 9. Under normal conditions, the one-way valve is kept sealed by a limit spring to prevent the extinguishing agent from leaking out. An input head 14 is also installed on one side of the explosion-proof plate 8 for replenishing or replacing the extinguishing agent when needed.

[0040] Pressure-triggered fire suppression mechanism

[0041] When an explosion occurs inside the cable chamber 2 due to an arc fault or other reasons, the internal pressure increases sharply. At this time, the piston rod 13 in the piston sealing seat 11 inside the one-way valve is pushed by the pressure of the impact plate 10 and moves along the inner wall of the piston sealing seat 11. The piston rod 13 is provided with a nozzle and a vent. When the piston rod moves, the extinguishing agent 9 inside the explosion-proof plate 8 is quickly sprayed into the cable chamber 2 through the nozzle and vent to extinguish the fire in time and prevent the fire from spreading.

[0042] Explosion-proof and protective functions

[0043] The cable compartment cover 3 and the explosion-proof plate 8 are both equipped with a sealing frame 15. The explosion-proof mesh 16 is connected inside the sealing frame 15. Both the inner and outer sides of the explosion-proof mesh 16 are equipped with explosion-proof glass of sufficient thickness, which further enhances the explosion-proof performance of the cable compartment. At the same time, the outer wall of the cable compartment cover 3 is connected to a protective plate 18 by a second bolt. The protective plate 18 is connected to a lighting lamp 17 for internal lighting. It is used in conjunction with the explosion-proof glass to facilitate daily inspection and maintenance.

[0044] Routine maintenance and observation

[0045] With the explosion-proof glass and lighting 17, staff can clearly observe the condition inside the cable room, promptly identify and address potential problems. This design not only improves equipment safety but also enhances the convenience of daily maintenance, ensuring that the equipment remains in good condition during long-term operation.

[0046] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-current air-insulated switchgear, comprising a switchgear body (1) and a cable compartment (2) therein, characterized in that: The switch cabinet body (1) is equipped with a reinforcing frame (4) inside. One side of the reinforcing frame (4) is connected to a cable chamber cover (3) that matches the inner wall of the cable chamber (2) by multiple hinges (5). The outer wall of the cable chamber cover (3) is threaded to the outer wall of the reinforcing frame (4) by multiple fixing bolts (7). The inside of the cable chamber cover (3) is equipped with an explosion-proof plate (8). The explosion-proof plate (8) stores a fire extinguishing agent (9) under vacuum conditions. One side of the explosion-proof plate (8) is connected to a one-way valve that communicates with the inside of the fire extinguishing agent (9). When an explosion impact occurs inside the cable chamber (2), the pressure increases sharply, and the one-way valve is opened to extinguish the fire.

2. The high-current air-insulated switchgear according to claim 1, characterized in that: The one-way valve includes a piston sealing seat (11) installed inside the explosion-proof plate (8). A piston rod (13) is movably installed inside the piston sealing seat (11). An impact plate (10) is connected to the outer end of the piston rod (13), and a sealing block (12) is connected to the inner end of the piston rod (13). A nozzle and a vent are respectively provided on the side of the piston rod (13) near the outer end and the inner end. When the pressure is large enough, the impact plate (10) and the piston rod (13) are pushed to move along the inner wall of the piston sealing seat (11), thereby making the interior of the explosion-proof plate (8) communicate with the outside.

3. A high-current air-insulated switchgear according to claim 2, characterized in that: One side of the piston rod (13) is connected to a limiting spring, and the other end of the limiting spring is connected to the piston sealing seat (11). By limiting the spring, the sealing of the vacuum inside the explosion-proof plate (8) under normal conditions is ensured, and the medium is prevented from leaking out.

4. A high-current air-insulated switchgear according to any one of claims 1-3, characterized in that: The cable compartment cover (3) and the explosion-proof plate (8) are both equipped with a sealing frame (15). The sealing frame (15) is connected to an explosion-proof mesh (16). The explosion-proof mesh (16) has explosion-proof glass of sufficient thickness on both its inner and outer sides and is connected to the inside of the corresponding cable compartment cover (3) and explosion-proof plate (8).

5. A high-current air-insulated switchgear according to claim 2, characterized in that: An input head (14) is installed on one side of the explosion-proof plate (8). One end of the input head (14) is connected to the inner wall of the explosion-proof plate (8) for inputting fire extinguishing medium.

6. A high-current air-insulated switchgear according to claim 4, characterized in that: The outer wall of the cable compartment cover (3) is connected to a protective plate (18) by a second bolt. The interior of the protective plate (18) is connected to a lighting lamp (17) for internal lighting and is used in conjunction with the explosion-proof glass.

7. A high-current air-insulated switchgear according to claim 1, characterized in that: The inner wall of the cable chamber cover (3) is connected to a first sealing gasket (6), and the cable chamber (2) is provided with a second sealing gasket (19) near the edge of the opening. The second sealing gasket (19) and the first sealing gasket (6) are matched in size.

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