Novel centrally installed switchgear bus connection structure and connection method

Abstract

The invention relates to the technical field of electrical equipment, and particularly discloses a novel centrally installed switchgear bus connection structure and a connection method.The novel centrally installed switchgear bus connection structure comprises a sleeve seat, the sleeve seat comprises an insulating sleeve and a conductive core arranged in the insulating sleeve, the insulating sleeve is used for being installed on a centrally installed switchgear, and the first end of the conductive core is provided with a connection plate; the connecting plate is used for being electrically connected with a static contact on a bus inside the centrally installed switchgear, and the second end of the conductive core is provided with a slot used for being matched with an external cable plug. One end of the conductive core is designed to be the connecting plate, and the other end of the conductive core is provided with the slot, so that the combination of reliable fixed connection inside the cabinet and rapid plugging outside the cabinet is realized, the problems of time-consuming installation and maintenance and inconvenient operation of a traditional bolt connection mode are solved, and the operation and maintenance efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of electrical equipment technology, and in particular to a novel busbar connection structure and connection method for a central switchgear. Background Technology

[0002] The full name of the medium-voltage switchgear is metal-armored medium-voltage withdrawable switchgear. It is the most commonly used medium- and high-voltage switchgear and a key component of the power system. It is characterized by safety, reliability, and ease of operation. It can control, protect, and monitor circuits, ensuring the safe operation and convenient maintenance of the power grid. It is widely used in various power systems.

[0003] To connect the internal busbars of a central power distribution unit (CPV) to external cables, a wall bushing is typically installed on the side panel of the CPV unit. This bushing is fixed to an opening in the side panel and has a conductive rod at its center. The internal busbars are bolted to one end of the conductive rod, while the external cables are connected to the end of the bushing located outside the CPV unit. Although this method moves the connection point outside the unit, it still essentially relies on bolt fastening and remains time-consuming to install. This connection structure is particularly inconvenient in situations requiring frequent connection switching after installation. Summary of the Invention

[0004] In order to facilitate the connection of the busbar inside the central power switch cabinet with external cables, this application provides a novel busbar connection structure and connection method for the central power switch cabinet.

[0005] Firstly, this application provides a novel busbar connection structure for a centrally located switchgear, employing the following technical solution: A novel busbar connection structure for a central switchgear includes a bushing base. The bushing base includes an insulating sleeve and a conductive core disposed inside the insulating sleeve. The insulating sleeve is used to install on the central switchgear. A connecting plate is provided at the first end of the conductive core. The connecting plate is used to electrically connect with a stationary contact on the busbar inside the central switchgear. A slot is provided at the second end of the conductive core for mating with an external cable plug.

[0006] By adopting the above technical solution, one end of the conductive core in this solution is connected to a connecting plate for reliable contact with the stationary contact on the busbar inside the cabinet, while the other end has a slot for mating with external cables. This transforms the traditional double-ended bolt fastening structure into a structure that facilitates quick insertion of external cables. This structure solves the technical problem of time-consuming installation of traditional connection methods mentioned in the background technology. When maintenance or temporary line switching is required, the external cable plug can be directly inserted and removed, making operation convenient and helping to improve operation and maintenance efficiency. In addition, this solution is particularly suitable for emergency repairs of distribution networks. It allows emergency power vehicles to be directly connected to the plug-in bushings of the medium-voltage switchgear via medium-voltage quick access boxes, and then connected to the busbars between cabinets to supply power to one or more medium-voltage switchgear units. Emergency power vehicles can be used to supply power in the event of a power outage at the equipment site, reducing power outage time and the affected area.

[0007] Optionally, the sleeve seat is a European-style sleeve.

[0008] By adopting the above technical solution and using the industry-standard European-style sleeve as the sleeve socket, the external interface of the connection structure is guaranteed to have good standardization and compatibility, and can be matched with standard European-style cable plugs, thereby improving the product's versatility and interchangeability.

[0009] Optionally, the insulating sleeve is provided with a flange for bolting to the side plate of the central cabinet.

[0010] By adopting the above technical solution, a flange is installed on the insulating bushing, providing a standard and stable interface for the installation of the bushing seat. The bushing seat can be reliably fixed to the side plate of the central switch cabinet by bolt connection. The installation process is simple and the connection is reliable.

[0011] Optionally, three sleeve seats are provided, and the three sleeve seats are located in the same straight line direction.

[0012] By adopting the above technical solution, three bushing sockets arranged in a straight line can be installed, corresponding one-to-one with the A, B, and C phase busbars in a three-phase power system, forming a complete three-phase cable connection interface that meets the standard application requirements of the power system. Furthermore, the three bushing sockets arranged in a straight line can be well matched with the cable plugs on the external emergency power vehicle, thus facilitating the connection between the central switch cabinet and the emergency power vehicle.

[0013] Optionally, it also includes a mounting plate, which is an insulating plate, and is used to detachably connect to the side panel of the central cabinet. The insulating sleeve is connected to the mounting plate.

[0014] By adopting the above technical solution, an independent insulating mounting plate is introduced, and three insulating sleeves are pre-integrated on the mounting plate to form a modular component. This design not only adds an insulating barrier outside the insulating sleeves due to the introduction of the insulating plate, extending the surface creepage distance and improving the overall insulation performance of the system; at the same time, during installation, only the entire module needs to be detachably connected to the cabinet side panel, and during maintenance, the entire module can be removed and replaced, which helps to simplify the installation and maintenance process and thus improve work efficiency.

[0015] Optionally, the mounting plate is provided with mounting studs, which are used to pass through the side plate of the central cabinet, and the mounting studs are threaded with limiting nuts for abutting against the side plate of the central cabinet.

[0016] By adopting the above technical solution and using a connection method that combines mounting studs and limit nuts, the installation and disassembly of the mounting plate module becomes convenient and quick. Installers only need to use tools to tighten or loosen the limit nuts from one side of the cabinet to complete the installation or disassembly, thus improving the convenience of installation.

[0017] Optionally, a partition is provided on the mounting plate between two adjacent insulating sleeves, and the partition is an insulating plate.

[0018] By adopting the above technical solution, an insulating partition is added between adjacent insulating bushings, which physically blocks and extends the surface discharge path between different phases. This can effectively prevent phase-to-phase flashover or short-circuit faults caused by dust, moisture and other factors, and further enhance the electrical safety and operational reliability of the three-phase connection system.

[0019] Optionally, the partition plate is provided with a first through hole and a second through hole. The first through hole extends along the length direction of the partition plate and the end of the first through hole away from the mounting plate passes through the partition plate. The second through hole is provided on the side wall of the partition plate and communicates with the first through hole. There are two sets of the second through holes, which are respectively located on both sides of the first through hole. Each set of the second through holes includes a plurality of holes arranged at intervals along the length direction of the partition plate. The two sets of the second through holes are arranged in an alternating manner.

[0020] By adopting the above technical solution, the specific perforation structure opened on the partition forms a wind channel to guide airflow. When there is convection in the surrounding air, the air can enter from one end of the first perforation and flow out from the second perforations arranged in a staggered pattern on both sides, forming a blowing effect on the surface of the bushing seat on both sides of the partition. This helps to remove the heat generated by the bushing seat during long-term operation, avoids heat accumulation, and thus improves the heat dissipation capacity of the connection structure, ensuring its stable operation under long-term high-current conditions.

[0021] More importantly, the staggered arrangement of the second perforations on both sides is key to achieving heat dissipation without sacrificing or even enhancing insulation performance. Specifically: First, it maintains an effective electrical clearance. The staggered arrangement disrupts the straight path between the holes on both sides of the partition. In the event of a potential interphase arc, since there is no straight path, the arc cannot take a shortcut to directly penetrate the partition, thus ensuring the effective air insulation distance between phases, i.e., the electrical clearance, and avoiding a significant reduction in insulation strength due to openings.

[0022] Secondly, it extends the creepage distance along the inner wall of the opening. Even if leakage current attempts to form a path through the inner wall of the channel, due to the misalignment of the outlet and inlet, the current must travel a non-linear, tortuous path along the inner wall of the perforation. This is equivalent to adding a sufficiently long crossing path in addition to the original path over the partition, ensuring that even with an opening, the total surface discharge distance, i.e., the creepage distance, still meets safety requirements.

[0023] Therefore, this design not only solves the heat dissipation problem, but also ensures that the core function of the partition as an insulating barrier is not affected through the ingenious staggered arrangement, achieving multi-functional integration in structure and balancing performance, and improving the overall reliability of the connection structure under harsh working conditions.

[0024] Optionally, a gas-generating material layer is provided on the inner wall of the first perforation.

[0025] By adopting the above technical solution, once an extreme fault such as a phase-to-phase short circuit occurs inside the switchgear, the enormous heat carried by the electric arc attempting to propagate along the first perforation will instantly activate the gas-generating material layer on the inner wall, causing it to rapidly decompose and generate a large amount of high-pressure gas with high dielectric strength. The high-pressure gas forms a strong directional blowing airflow within the narrow first perforation, which can violently elongate, cool, and deionize the electric arc, disrupting the conditions for stable arc combustion. Thus, the arc is actively and quickly extinguished in the initial stage of the fault, effectively preventing the fault from escalating and avoiding catastrophic accidents such as equipment burnout or even explosion.

[0026] The important safety function of arc extinguishing is highly integrated into the insulating partition, eliminating the need for additional, complex, and independent arc extinguishing devices. This dual-purpose design is compact and saves valuable cabinet space.

[0027] In addition, during normal operation, the gas-generating material layer acts as a stable insulating inner wall, without affecting the original airflow and heat dissipation functions of the first perforation. It is only activated under fault conditions that detect high arc temperatures, ensuring that the solution improves safety without negatively impacting conventional performance.

[0028] Secondly, this application provides a connection method, applying any of the novel central-voltage switchgear busbar connection structures described above, comprising the following steps: Step S1: Install the insulating sleeve onto the side panel of the central cabinet; Step S2: Align and secure the stationary contact on the busbar inside the central cabinet with the connecting plate at the first end of the conductive core; Step S3: Align the external cable plug with the second end of the conductive core and push the external cable plug in axially to complete the connection.

[0029] By adopting the above technical solution, the axial push-in plugging method replaces the traditional time-consuming bolt tightening process, making the connection operation of external cables simple and fast. Compared with the background technology, it has significant improvements in installation efficiency and ease of operation.

[0030] In summary, this application includes the following beneficial technical effects: 1. One end of the conductive core is connected to a connecting plate, and the other end is equipped with a slot, which realizes the combination of reliable fixed connection inside the cabinet and quick plug-in and unplug function outside the cabinet. This solves the problems of time-consuming installation and maintenance and inconvenient operation of traditional bolt connection methods, and improves operation and maintenance efficiency.

[0031] 2. By introducing an insulating mounting plate and phase-to-phase insulating partitions, a multi-layered insulation protection system is formed, consisting of bushing self-insulation, mounting plate insulation, and phase-to-phase isolation, thereby improving the insulation strength and operational safety of the entire connection system.

[0032] 3. By setting a specific air duct structure on the partition, air convection is used to dissipate heat from the heat-generating components, thereby improving the thermal stability of the connection structure under long-term high-current conditions. Attached Figure Description

[0033] Figure 1 This is a cross-sectional view of Embodiment 1 of this application, showing the installation position of the sleeve seat from a frontal view. Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle; Figure 3 This is a top-view cross-sectional view of Embodiment 2 of this application, showing the positional relationship between the sleeve seat and the partition. Figure 4 yes Figure 3 A magnified view of a portion of point B in the middle.

[0034] Reference numerals: 1. Sleeve seat; 11. Insulating sleeve; 111. Flange; 12. Conductive core; 121. Slot; 122. Connecting hole; 2. Connecting plate; 3. Mounting plate; 31. Mounting stud; 32. Limiting nut; 4. Partition plate; 41. First through hole; 411. Gas-generating material layer; 42. Second through hole; 5. Locking bolt; 6. Central cabinet; 7. Busbar. Detailed Implementation

[0035] The following combination Figures 1-4 This application will be described in further detail.

[0036] Example 1: This application discloses a novel busbar connection structure for a central switchgear cabinet. This connection structure is mainly applied to the central switchgear cabinet 6 and is used to connect the stationary contacts on the busbar 7 inside the central switchgear cabinet 6 with the external incoming and outgoing cables.

[0037] The core component of the connection structure is the bushing seat 1. To meet the application requirements of a three-phase power system, three bushing seats 1 are provided. These three bushing seats 1 are all installed on the same horizontal line, corresponding to phases A, B, and C respectively. Each bushing seat 1 uses a European-style bushing that conforms to industry standards, aiming to replace traditional through-wall bushings. Its advantage lies in the fact that it can upgrade the connection method without changing the cabinet structure of the original central switch cabinet 6 and the layout of the internal busbars 7, thereby ensuring the universality of the external interface of the structure and making it easy to use with standard European-style cable plugs on the market.

[0038] Reference Figure 2 Each bushing seat 1 includes an insulating sleeve 11 that serves as insulation and a conductive core 12 fixedly installed at the center of the insulating sleeve 11. A flange 111 is integrally formed circumferentially on the outer wall of the insulating sleeve 11, and several mounting holes are provided on the flange 111. During installation, bolts are passed through these mounting holes to securely fix the entire bushing seat 1 to the reserved opening on the side plate of the central cabinet 6.

[0039] At the root of the insulating sleeve 11 near the flange 111, an annular equipotential ring is disposed inside its insulating material. The equipotential ring is coaxially arranged with the internal conductive core 12 and separated by an insulating medium, and its function is similar to that of a capacitor. The presence of the equipotential ring can change the potential distribution in this area, making the potential gradient from the high-voltage conductor to the grounding flange gentler, forcing the electric field lines to diverge uniformly, thereby effectively alleviating the electric field stress concentration phenomenon at the root and preventing the breakdown of air or insulating material due to excessive local field strength, thus suppressing the generation of partial discharge from the source.

[0040] On the outer surface of the insulating sleeve 11, starting from the high-potential end near the slot 121 at the end of the conductive core 12 and extending towards the flange 111, a layer of semi-conductive material is coated; this is the semi-conductive shielding layer. Its core function is to smoothly transition the high potential from the conductive core 12 to the outer surface of the insulating sleeve 11, forming an equipotential surface. This eliminates the potential difference between the conductive core 12 and the air on the outer surface of the insulating sleeve 11, avoiding electric field concentration and air discharge caused by edge effects at the conductor's exit point. Therefore, the electric field distribution along the surface of the insulating sleeve 11 is optimized, reducing the risk of surface flashover and ensuring the long-term electrical stability of the entire connection point.

[0041] The conductive core 12 penetrates the insulating sleeve 11. The first end of the conductive core 12 is located inside the central switchgear 6, while the second end extends outside the central switchgear 6. To achieve a reliable connection between the conductive core 12 and the stationary contact on the busbar 7 inside the switchgear, the first end of the conductive core 12 has a threaded connection hole 122. A copper connecting plate 2 is provided on the outer side of the first end of the conductive core 12. The connecting plate 2 has a connection port. By aligning the connection port on the connecting plate 2 with the connection hole 122 at the end of the conductive core 12 and then screwing in the locking bolt 5, the connecting plate 2 can be pressed and fixed to the end of the conductive core 12, thus achieving a conductive connection. The other end of the connecting plate 2 also has a connection port. By lapping the connecting plate 2 against the stationary contact on the busbar 7 inside the central switchgear 6 and then screwing in the locking bolt 5 for tightening, a reliable electrical connection with low contact resistance can be formed.

[0042] It should be noted that the main circuit conductor inside the central switchgear 6 in this scheme, namely the busbar 7, is not a traditional circular cross-section conductor, but a plate-shaped or bar-shaped conductor structure with a large surface area, commonly referred to as a busbar. This busbar structure is a common design feature of high-voltage switchgear for carrying large currents, facilitating multi-branch connections, and providing good heat dissipation. Therefore, the connection between the connecting plate 2 and the stationary contacts on the busbar 7 specifically refers to the face-to-face overlap of the wide plane of the connecting plate 2 with the wide plane of the stationary contacts on the busbar, followed by bolt fastening. This surface contact method provides a larger and more reliable contact area, effectively reducing contact resistance and temperature rise, ensuring the stability and safety of high-current transmission.

[0043] The second end of the conductive core 12 has a slot 121. When an external line needs to be connected, the operator only needs to align the cable plug with the corresponding pin at the end of the external cable with the slot 121 at the end of the conductive core 12 and push it in axially to complete the connection, eliminating the cumbersome bolt connection operation.

[0044] The slot 121 employs a spring-loaded contact structure, similar to watchband contacts or crown spring contacts. When the plug is inserted, these spring contacts tightly wrap around the pins, generating stable and sufficient contact pressure through their own elastic deformation, thus ensuring reliable power transmission. This self-contained contact method replaces traditional copper busbar bolt fixing, providing not only reliable connections but also significantly reducing on-site installation and wiring time.

[0045] Operationally, this connection structure supports plug-and-play operation. A mechanical locking device is designed between the external cable plug and the sleeve socket 1, automatically locking the plug once it is fully inserted. To disconnect, simply release the lock for quick removal, eliminating the need for prolonged power outages. Furthermore, due to the standardized interface, different specifications or models of external cables can be matched with standard European plugs using different rubber adapters, without requiring modifications to the connection structure itself, thus enhancing the compatibility and applicability of the solution.

[0046] In terms of safety, once the external cable plug is installed, its outer casing is reliably connected to the grounding terminal of sleeve seat 1 via the internal grounding spring wire, forming a continuous shielded path from the cable shielding layer to the cabinet grounding. The entire connection is completely enclosed within the grounded shielding layer, achieving full shielding and touchable safety features, eliminating the risk of accidental electric shock to operators.

[0047] Furthermore, the connection between the external cable plug and the cable is double-sealed using a rubber insulating adapter and external heat shrink tubing. This sealing structure achieves a high protection rating, such as IP67 or IP68, enabling the entire connection node to withstand harsh outdoor, humid, and even corrosive environments, ensuring its long-term stable operation.

[0048] When this connection structure is in operation, current flows through the external cable, the plug at the end of the external cable, the conductive core 12, the connecting plate 2, and finally into the internal busbar 7 of the central switch cabinet 6. When equipment maintenance or line testing is required, the external cable plug can be quickly unplugged to disconnect the connection, and it can be quickly plugged back in after the work is completed to restore power. This process helps save time compared to the traditional bolt removal and installation operation.

[0049] This solution is particularly suitable for emergency repairs of power distribution networks. It allows an emergency power vehicle to directly connect to the bushing socket 1 on the medium-voltage switchgear 6 via a medium-voltage quick-access box (both ends of the connecting cable are T-type connectors). Then, through the busbar connection between the switchgear units, power can be supplied to one or more medium-voltage switchgear 6 units. Therefore, an emergency power vehicle can be used to supply power in the event of a power outage at the equipment site, reducing outage time and the affected area.

[0050] The implementation principle of Example 1 is as follows: An integrated sleeve base 1 is used, and the two ends of the conductive core 12 inside have different functions. One end of the conductive core 12 is fixedly connected to the stationary contact on the busbar 7 in the cabinet through the connecting plate 2 to ensure electrical performance. The other end of the conductive core 12 is designed as a standardized slot 121, which cooperates with the external cable plug to realize repeatable quick plugging and unplugging operations, thereby simplifying the installation and maintenance process and improving the operation and maintenance flexibility of the central cabinet 6.

[0051] This embodiment also discloses a connection method, including the following steps: Step S1: Fix the insulating sleeve 11 to the side plate of the central cabinet 6.

[0052] Step S2: Align and overlap the stationary contact on the busbar 7 inside the central cabinet 6 with the connecting plate 2 at the first end of the conductive core 12, and then screw in the locking bolt 5 to fix the stationary contact on the busbar 7 to the connecting plate 2.

[0053] Step S3: Align the external cable plug with the slot 121 at the second end of the conductive core 12, and push the external cable plug in axially to complete the connection.

[0054] Example 2: Based on Example 1, this example further optimizes the installation method and safety performance of the connection structure.

[0055] Reference Figure 3 Unlike the independent installation of each sleeve seat 1 in Embodiment 1, this embodiment also includes a mounting plate 3. This mounting plate 3 is made of high-strength insulating material, such as epoxy resin board. The mounting plate 3 has three mounting holes pre-drilled on it for fixing the three insulating sleeves 11 to it, thereby forming an integrated module.

[0056] To install this module onto the side panel of the central switchgear 6, a plurality of mounting studs 31 are fixedly connected to one side of the mounting plate 3, arranged axially along the insulating sleeve 11. During installation, the entire module is aligned from the outside of the cabinet with the reserved position on the side panel of the central switchgear 6, so that the mounting studs 31 pass through the corresponding reserved through holes on the side panel. Subsequently, inside the cabinet, the limiting nut 32 is screwed into the end of the mounting stud 31 and tightened, so that the limiting nut 32 abuts against the inner wall of the side panel of the central switchgear 6, thereby firmly positioning the entire mounting plate 3 through the clamping force of the limiting nut 32 against the side panel. This modular installation method simplifies the original work of installing and fixing in three stages to a one-time positioning and tightening, which helps to improve assembly efficiency. At the same time, since the mounting plate 3 is an insulating plate, it adds an extra layer of planar insulation between the insulating sleeve 11 and the grounded metal cabinet, extending the potential leakage creepage distance and improving the overall insulation margin.

[0057] Reference Figure 3 and Figure 4 To further improve the interphase insulation safety performance, an insulating partition 4 is integrally formed on the mounting plate 3. The partition 4 is made of epoxy resin board, which has strong insulation properties. Two partitions 4 are provided, and each partition 4 is located between two adjacent bushing seats 1. The partition 4 is perpendicular to the surface of the mounting plate 3 and passes through the mounting plate 3. That is, one part of the partition 4 is located on the side of the mounting plate 3 facing the outside of the central switch cabinet 6, and the other part of the partition 4 is located on the side of the mounting plate 3 facing the inside of the central switch cabinet 6. The presence of the partition 4 separates the air gaps between the charged bodies of different phases and significantly increases the creepage distance along the phase surface. It can effectively prevent phase-to-phase flashover accidents caused by insufficient insulation distance in humid or dusty environments, ensuring the safety of equipment operation.

[0058] Reference Figure 4 Furthermore, to optimize the heat dissipation performance of the connection structure during long-term operation, each insulating partition 4 has a special air duct structure inside. Specifically, a first through hole 41 is provided inside the partition 4 along its length (i.e., from inside the cabinet to outside), and the end of the first through hole 41 away from the mounting plate 3 passes through the end face of the partition 4. At the same time, a first set of second through holes 42 is provided on one side wall of the partition 4, and a second set of second through holes 42 is provided on the other side wall of the partition 4, so that the first through hole 41 is located between the two sets of second through holes 42. Each set of second through holes 42 includes multiple parallel through holes spaced apart, and the multiple second through holes 42 are arranged in parallel along the length of the partition 4. One end of the second through hole 42 passes through the side wall of the partition 4, and the other end of the second through hole 42 communicates with the first through hole 41. The two sets of second through holes 42 are staggered along the length of the partition 4.

[0059] During operation, the temperature difference between the inside and outside of the cabinet causes natural air convection. Cool external air is drawn in through the opening of the first perforation 41 at one end of the partition 4, flows inside the partition 4, and exits through the second perforations 42 on both sides, directly blowing onto the surface of the adjacent insulating sleeve 11. This design cleverly utilizes the structure of the partition 4 to form a passive heat dissipation system, helping to remove the heat generated by the sleeve seat 1 due to carrying large currents, thus avoiding the impact of excessively high local temperatures on the performance of the insulation material and ensuring the stability and reliability of the connection structure under long-term heavy loads. Furthermore, because the two sets of second perforations 42 are staggered, while ensuring ventilation and heat dissipation, the perforations are prevented from significantly reducing electrical clearance, thereby ensuring safety.

[0060] Furthermore, a gas-generating material layer 411 is provided on the inner wall of the first perforation 41. The gas-generating material layer 411 can be firmly bonded to the partition plate 4 through processes such as co-injection molding, inner lining inlay, or inner wall coating to form an integral structure. The gas-generating material layer 411 is designed to maintain excellent insulation during normal operation and to decompose rapidly at the high temperature of the electric arc to generate arc-extinguishing gas with high dielectric strength.

[0061] As a preferred option, the gas-generating material layer 411 is made of an organic polymer material, such as polyoxymethylene (POM). POM decomposes under the action of an electric arc to produce a large amount of formaldehyde gas with a strong deionizing effect, exhibiting extremely strong arc-extinguishing ability, making it the preferred material in this solution. As another optional embodiment, the material can also be one or a combination of nylon, melamine resin, etc., which also possess good gas-generating and arc-extinguishing characteristics. Under normal operating temperature, the gas-generating material layer 411 is stable and, like the partition 4, only serves as insulation and support; the first perforation 41 functions normally as a channel for air insulation and natural ventilation and heat dissipation.

[0062] When a phase-to-phase short circuit fault occurs inside the cabinet, the electric arc will attempt to develop along the path with the shortest insulation distance between the two phase conductors. The core temperature of the arc can reach thousands or even tens of thousands of degrees Celsius. When the arc enters the first perforation 41, the enormous heat energy it carries is instantly transferred to the gas-generating material layer 411 on the inner wall. The gas-generating material layer 411 is activated at high temperature, undergoing a violent thermal decomposition reaction, generating a large amount of high-pressure arc-extinguishing gas in a very short time. Since the first perforation 41 is a narrow and elongated pipe structure, this high-pressure gas forms a strong directional airflow, violently blowing and cooling the arc from the inside out, rapidly elongating the arc column, and filling it with a high-dielectric-strength gas medium to replace the ionized air.

[0063] Under the purging and deionizing effect of the strong airflow, the electric arc cannot maintain stable combustion and is thus quickly extinguished. At the same time, the residual arc plasma and high-temperature gas will be discharged by this powerful airflow through the second perforation 42, which is connected to it, further realizing energy conduction and rapid cooling, effectively protecting the safety of equipment and personnel.

[0064] The implementation principle of Example 2 is as follows: By integrating the three-phase bushing socket 1 onto an insulating mounting plate 3, a modular assembly and disassembly are formed, achieving both ease of installation and improved insulation performance. Simultaneously, an interphase insulating partition 4 is integrated into the module, which extends the creepage distance and increases the electrical clearance. The partition 4 has interconnected first and second through holes 41 and 42, enabling passive heat dissipation via air convection. This constructs a comprehensive connection solution integrating quick insertion / removal, high insulation, self-heating, and easy maintenance.

[0065] The above are optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel busbar connection structure for a centrally located cabinet, characterized in that: Includes a sleeve base (1), the sleeve base (1) includes an insulating sleeve (11) and a conductive core (12) disposed inside the insulating sleeve (11). The insulating sleeve (11) is used to be installed on the central cabinet (6). The first end of the conductive core (12) is provided with a connecting plate (2). The connecting plate (2) is used to be electrically connected to the stationary contact on the busbar (7) inside the central cabinet (6). The second end of the conductive core (12) is provided with a slot (121) for cooperating with an external cable plug.

2. The novel central-mounted cabinet busbar connection structure according to claim 1, characterized in that: The sleeve seat (1) is a European-style sleeve.

3. The novel central-mounted cabinet busbar connection structure according to claim 1, characterized in that: The insulating sleeve (11) is provided with a flange (111) for bolting to the side plate of the central cabinet (6).

4. The novel central-mounted cabinet busbar connection structure according to claim 1, characterized in that: There are three sleeve seats (1), and the three sleeve seats (1) are located in the same straight line direction.

5. The novel central-mounted cabinet busbar connection structure according to claim 4, characterized in that: It also includes a mounting plate (3), which is an insulating plate. The mounting plate (3) is used to detachably connect to the side plate of the central cabinet (6), and the insulating sleeve (11) is connected to the mounting plate (3).

6. The novel central-mounted cabinet busbar connection structure according to claim 5, characterized in that: The mounting plate (3) is provided with mounting studs (31), which are used to pass through the side plate of the central cabinet (6). The mounting studs (31) are threaded with limiting nuts (32) for abutting against the side plate of the central cabinet (6).

7. A novel central-mounted cabinet busbar connection structure according to claim 5, characterized in that: The mounting plate (3) has a partition (4) between two adjacent insulating sleeves (11), and the partition (4) is an insulating plate.

8. The novel central-mounted cabinet busbar connection structure according to claim 7, characterized in that: The partition (4) is provided with a first through hole (41) and a second through hole (42). The first through hole (41) extends along the length direction of the partition (4) and the end of the first through hole (41) away from the mounting plate (3) passes through the partition (4). The second through hole (42) is provided on the side wall of the partition (4) and communicates with the first through hole (41). There are two sets of the second through holes (42) and they are located on both sides of the first through hole (41). Each set of the second through holes (42) includes a plurality of holes arranged at intervals along the length direction of the partition (4). The two sets of the second through holes (42) are arranged in an alternating manner.

9. A novel central-mounted cabinet busbar connection structure according to claim 8, characterized in that: A gas-generating material layer (411) is provided on the inner wall of the first perforation (41).

10. A connection method, characterized in that: The application of the novel central-voltage switchgear busbar connection structure according to any one of claims 1-9 includes the following steps: Step S1: Install the insulating sleeve (11) onto the side plate of the central cabinet (6); Step S2: Align and secure the stationary contact on the busbar (7) inside the central cabinet (6) with the connecting plate (2) at the first end of the conductive core (12); Step S3: Align the external cable plug with the second end of the conductive core (12) and push the external cable plug in axially to complete the connection.

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