A detachable conductor shielding connection device for air GIS bus

Abstract

The application provides a detachable conductor shielding connecting device for an air GIS bus, and belongs to the field of air insulation enclosed switchgear; the device comprises an outer shielding cover, a conductor transition connecting body, a shielding bolt connecting piece and a conductor bolt connecting piece; the outer shielding cover is coated outside the conductor transition connecting body, and the outer shielding cover is detachably connected with the conductor transition connecting body through the shielding bolt connecting piece; the conductor transition connecting body is electrically connected with a conductor to be connected through the conductor bolt connecting piece, and the conductor bolt connecting piece is received in the internal space of the outer shielding cover. The application realizes quick detachable assembly and maintenance of the bus conductor, all-around electromagnetic shielding of the connecting position, high-efficiency ventilation and heat dissipation, simultaneously optimizes the structure forming process, improves the assembly precision and the structural stability, and significantly improves the high-voltage operation safety and the service life of the air GIS bus system.

Description

Technical Field

[0001] This invention provides a detachable conductor shielding connection device for air-insulated GIS busbars, belonging to the field of air-insulated enclosed switchgear. Background Technology

[0002] Air-based GIS equipment uses air as the insulating medium and boasts advantages such as compact structure, stable insulation performance, convenient operation and maintenance, and small footprint. It is widely used in critical power scenarios such as high-voltage and ultra-high-voltage power transmission and distribution systems, power supply for industrial and mining enterprises, and rail transit power supply. As the core current-carrying component of air-based GIS equipment, the conductivity reliability, electric field uniformity, heat dissipation performance, and maintainability of the connection structure between adjacent conductors directly determine the insulation level, current-carrying capacity, and long-term operational stability of the entire equipment.

[0003] The existing shielding connection structures of air-insulated GIS busbar conductors generally suffer from numerous inherent technical defects, making it difficult to meet the high-standard operational requirements under high-voltage conditions. Currently, the mainstream connection structures mostly adopt integral cast shielding structures or one-piece welded fixed connection structures. First, cast shielding covers are prone to internal defects such as porosity, sand holes, and shrinkage, resulting in low molding precision and high surface roughness. This can cause electric field distortion at the connection points, inducing partial discharge, and long-term operation can easily lead to insulation aging and breakdown. Simultaneously, cast structures are heavy, have low material utilization, and are costly to process. Second, the one-piece welded fixed structure is an irreversible connection method; once the equipment is assembled at the factory, it cannot be disassembled. When the busbar experiences faults such as poor contact, localized overheating, or insulation abnormalities, or when conductor replacement is required, the entire busbar structure must be disassembled and cut. This results in a huge workload for maintenance, low maintenance efficiency, and a high risk of damaging the busbar body and sealing structure, significantly shortening the equipment's service life.

[0004] Furthermore, in existing conventional connection structures, conductor fastening bolts are often exposed outside the shielding structure, or there are gaps and dead angles in the shielding. Under the action of a high-voltage electric field, exposed bolts are prone to forming electric field concentration points, causing partial discharge and corona phenomena, which seriously damage the equipment insulation system. At the same time, the traditional conductor connection part is a closed solid structure without a dedicated heat dissipation channel. The contact resistance at the conductor mating position is relatively large. Under long-term high-current carrying conditions, heat continues to accumulate and cannot be dissipated in time, which will aggravate conductor oxidation and further increase contact resistance, forming a vicious cycle of overheating. This can easily lead to equipment overheating failure, tripping, or even insulation breakdown accidents.

[0005] In addition, the existing connection structure has poor matching between its outer diameter and the busbar conductor's outer diameter, and there are significant dimensional abrupt changes at the connection position, resulting in extremely uneven electric field distribution across the busbar. Furthermore, the structure lacks a dedicated positioning and assembly structure, relying entirely on manual alignment during assembly, leading to low assembly accuracy and a high risk of assembly interference, misalignment, and inadequate bolt tightening. This results in loose connections and poor contact, failing to meet the engineering requirements of high precision, high reliability, and easy disassembly and maintenance for high-voltage air GIS busbars. In summary, the existing technology suffers from poor disassembly and assembly, insufficient shielding performance, weak heat dissipation, low assembly accuracy, and poor operational reliability. Therefore, there is an urgent need to propose a conductor shielding connection device with optimized structure, rapid disassembly and assembly, excellent shielding effect, and efficient heat dissipation. Summary of the Invention

[0006] To address the aforementioned deficiencies and shortcomings of existing technologies, the present invention aims to provide a detachable conductor shielded connection device for air GIS busbars. This device addresses the technical problems of existing busbar connection structures, such as difficult assembly and disassembly, incomplete shielding, poor heat dissipation, uneven electric field distribution, low assembly precision, poor operational reliability, and high maintenance costs. It achieves rapid detachable assembly and maintenance of busbar conductors, comprehensive electromagnetic shielding of connection points, and efficient ventilation and heat dissipation. Simultaneously, it optimizes the structural forming process, improves assembly precision and structural stability, and significantly enhances the high-voltage operational safety and service life of air GIS busbar systems.

[0007] To address the aforementioned problems, the present invention proposes the following technical solution: a detachable conductor shielding connection device for an air GIS busbar, comprising an outer shielding cover, a conductor transition connector, a shielding bolt connector, and a conductor bolt connector; the outer shielding cover covers the outside of the conductor transition connector, and the outer shielding cover is detachably connected to the conductor transition connector via the shielding bolt connector; the conductor transition connector is electrically connected to the conductor to be connected in the air GIS busbar via the conductor bolt connector, and the conductor bolt connector is housed within the internal space of the outer shielding cover.

[0008] Furthermore, the outer shield is composed of two semi-cylindrical shield halves joined together. The outer shield includes a shield body and a shield support welded and fixed to the shield body. The outer shield is formed by stamping and welding of thin plates and has no casting structure.

[0009] Furthermore, the central angle corresponding to each half of the semi-cylindrical cover is less than 180°, the edges of the semi-cylindrical cover are rounded, and the single-sided shearing allowance of the semi-cylindrical cover is not less than 0.5mm; the two halves of the semi-cylindrical cover do not interfere with each other after being assembled together.

[0010] Furthermore, the conductor transition connector has a U-shaped groove for accommodating the conductor bolt connector; the conductor transition connector has a countersunk hole with a threaded hole at the bottom, and the shielding bolt connector passes through the threaded hole of the countersunk hole to achieve fastening between the outer shield and the conductor transition connector.

[0011] Furthermore, the conductor transition connector has interconnected central through holes and radial through holes to form ventilation and heat dissipation channels; all sharp corners on the outer contour of the conductor transition connector are rounded.

[0012] Furthermore, the maximum outer diameter of the detachable conductor shielding connection device is equal to the outer diameter of the conductor to be connected.

[0013] Furthermore, the inner side of the outer shield is provided with two or more installation positioning positions, and the conductor transition connector is provided with an assembly and mating structure that matches the installation positioning positions one by one.

[0014] Furthermore, the intermediate conductive connection cross section of the conductor transition connector adopts a simplified profile configuration.

[0015] Furthermore, the detachable conductor shielding connection device is used for conductive transition connections between air GIS branch bus conductors, between three-phase common-box bus conductors, or between conductors and insulator inserts.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the detachable conductor shielding connection device for air GIS busbar of the present invention are as follows: 1. This invention adopts a split, detachable shielding connection structure, which overturns the traditional integrated fixed structure. The outer shielding cover can be independently installed and removed. During maintenance, there is no need to disassemble the bus conductor connection structure, which greatly simplifies the operation and maintenance process, reduces the workload of operation and maintenance and the risk of equipment damage, and meets the engineering requirements of rapid maintenance of power equipment. At the same time, the conductor bolt connection is completely enclosed inside the outer shielding cover, realizing all-round electromagnetic shielding without dead angles at the connection point, completely eliminating problems such as electric field distortion, partial discharge and corona caused by exposed bolts, effectively uniformly distributing the high-voltage electric field, and significantly improving the insulation safety and stability of high-voltage operation of air GIS busbars.

[0017] 2. The outer shielding cover of this invention adopts a thin-plate stamping and welding process, abandoning the traditional casting method. This eliminates casting defects such as porosity, sand holes, and deformation at the source, improving the dimensional accuracy and surface flatness of the shielding structure, resulting in better shielding performance consistency. Simultaneously, the stamping and welding structure is lighter, has higher material utilization, lower processing costs, and higher production efficiency, making it suitable for mass industrial production. The two-half semi-cylindrical cover adopts a small central angle, rounded edges, and controllable shearing allowance design, completely avoiding assembly interference problems and ensuring assembly fit accuracy and structural stability.

[0018] 3. The present invention sets up a through-type axial and radial combined heat dissipation channel inside the conductor transition connector, which can realize air convection heat exchange at the connection point, quickly dissipate the heat accumulated under high current carrying conditions, effectively reduce the working temperature at the conductor connection point, suppress conductor oxidation and increased contact resistance, avoid the vicious cycle of overheating, and greatly improve the conductor conductivity stability and long-term operating life of the equipment; at the same time, the overall passivated rounded corner design completely eliminates structural sharp points, eliminates the hidden danger of sharp discharge, and optimizes the overall electric field distribution.

[0019] 4. The outer diameter of the device of the present invention is completely consistent with the outer diameter of the busbar conductor, so as to achieve a continuous and smooth outer diameter of the busbar without abrupt changes and avoid defects of local electric field concentration. With the cooperation of multiple sets of one-to-one corresponding positioning and assembly structures, the precise alignment and installation of the outer shield and the conductor transition connection body can be achieved, effectively solving problems such as manual alignment deviation, assembly misalignment, and loose connection, and significantly improving assembly accuracy, assembly efficiency and structural connection reliability.

[0020] 5. The conductor transition connector of this invention adopts a simplified and smooth conductive cross-section configuration. While meeting the core requirements of current carrying capacity and mechanical strength, it simplifies redundant structures, reduces raw material consumption, lowers equipment weight and production costs, and has stronger structural adaptability. At the same time, the device is suitable for various busbar connection scenarios, has wide versatility, and high engineering application value. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of a detachable conductor shielding connection device for an air GIS busbar according to the present invention.

[0022] Figure 2 This is a cross-sectional view (AA) of a detachable conductor shielding connection device for an air GIS busbar according to the present invention.

[0023] Figure 3 This is a BB cross-sectional view of a detachable conductor shielding connection device for an air GIS busbar according to the present invention.

[0024] Figure 4 This is a diagram of the outer shield of a detachable conductor shielding connection device for an air GIS busbar according to the present invention.

[0025] Figure 5 This is a diagram of the conductor transition connection of a detachable conductor shielding connection device for an air GIS busbar according to the present invention.

[0026] Figure 6 This is a cross-sectional view of the conductor transition connector AA of a detachable conductor shielding connection device for an air GIS busbar according to the present invention.

[0027] Figure 7 This is an extension of the present invention of a detachable conductor shielding connection device for an air GIS busbar.

[0028] Figure 8 This is a second extension of the present invention, which describes a detachable conductor shielding connection device for an air GIS busbar.

[0029] In the picture: 1. Outer shielding cover; 2. Conductor transition connector; 3. Shielding bolt connector; 4. Conductor bolt connector. Detailed Implementation

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] This invention provides a detachable conductor shielding connection device for air-insulated GIS busbars: including an outer shielding cover 1, a conductor transition connector 2, shielding bolt connectors 3, and conductor bolt connectors 4. The conductor transition connector 2, as the core conductive transition component, overlaps between two sets of busbar conductors to be connected, and achieves conductive fastening connection through the conductor bolt connectors 4; the outer shielding cover 1 is separately wrapped around the outside of the conductor transition connector 2, and is detachably fixed to the conductor transition connector 2 through multiple sets of shielding bolt connectors 3; all conductor bolt connectors 4 used for conductor docking are housed in the internal cavity of the outer shielding cover 1, achieving complete sealed shielding.

[0032] In this embodiment, the outer shield 1 is composed of two symmetrical semi-cylindrical shield bodies joined together to form a cylindrical shield body. The outer shield 1 is made by welding the shield body and the shield support structure together. The whole is made of stainless steel sheet stamping and welding splicing. There are no casting parts. The structure has a smooth surface, high dimensional accuracy, no casting defects, and good shielding uniformity.

[0033] Specifically, the central angle of a single semi-cylindrical cover is set to 175°, less than 180°, to allow for a reasonable gap for bidirectional assembly; all edges of the semi-cylindrical cover are mechanically rounded to eliminate sharp edges; the single-sided shearing allowance is set to 0.6mm to meet the process requirement of ≥0.5mm; after the two semi-cylindrical covers are assembled, the gap is uniform and there is no squeezing interference, resulting in high assembly consistency.

[0034] The conductor transition connector 2 has symmetrical U-shaped mounting grooves on its left and right sides for precise and close fitting of the conductor bolt connector 4, enabling concealed installation of the conductor connecting bolts and ensuring the integrity and continuity of the external shielding structure. Several countersunk holes are evenly distributed on the end face of the conductor transition connector 2. The bottom of each countersunk hole is coaxially machined with a matching threaded hole. The shielding bolt connector 3 passes through the pre-fabricated mounting hole of the outer shield 1 and is locked into the threaded hole at the bottom of the countersunk hole, achieving a tight fixation between the outer shield 1 and the conductor transition connector 2. The countersunk hole structure allows the bolts to be hidden, preventing bolt protrusion from causing electric field distortion.

[0035] The conductor transition connector 2 integrates a ventilation and heat dissipation structure, featuring an axially arranged through-hole at the center and multiple radial through-holes. These interconnected through-holes form a three-dimensional, cross-flow convection heat dissipation channel. During operation, heat generated at the connection point can be rapidly dissipated and cooled by convection with external air through these through-holes, effectively mitigating the heat accumulation defects of traditional structures. Furthermore, all sharp corners and edges of the conductor transition connector 2 are rounded to eliminate electric field concentration points, ensuring a uniform distribution of the high-voltage electric field.

[0036] The maximum outer diameter of this device is exactly the same as the outer diameter of the conductor of the air GIS busbar to be connected, so that the outer diameter of the busbar connection position is continuous and smooth without abrupt changes in size. This avoids the problem of local electric field concentration from a structural point of view and ensures the stability of the overall insulation performance of the busbar.

[0037] To improve assembly accuracy and efficiency, three positioning slots are evenly arranged on the inner side of the outer shield 1 as installation positioning positions, and three positioning bosses are correspondingly set on the outer side of the conductor transition connector 2 as assembly mating structures. The positioning slots and positioning bosses match one by one and engage precisely, which can quickly align and limit the position during assembly, effectively avoiding problems such as assembly offset, misalignment, and loosening, and improving the reliability of structural assembly.

[0038] The intermediate conductive connection section of the conductor transition connector 2 adopts a simplified circular arc smooth contour configuration, eliminating redundant protrusions and complex structures. While ensuring that the current-carrying cross-sectional area meets the rated current-carrying requirements and the mechanical strength meets the installation and operation conditions, the structure is simplified, raw materials are saved, and the product weight and production cost are reduced.

[0039] This device can be widely used for the connection of branch busbar conductors in air GIS equipment, the transition connection of three-phase common-box busbar conductors, and the conductive transition connection between busbar conductors and insulator inserts. It is suitable for various high-voltage busbar installation conditions and has strong versatility and engineering applicability.

[0040] The assembly and operation process of this invention is as follows: During assembly, the conductor transition connector 2 is first placed between the two sets of busbar conductors to be connected, aligning the mating end faces. The conductor bolt connector 4 is then placed in the U-shaped groove and tightened to complete the conductive and fixed connection between the conductor transition connector 2 and the busbar conductors on both sides. Subsequently, the two semi-cylindrical outer shielding covers 1 are aligned and engaged with the positioning bosses of the conductor transition connector 2 through the inner positioning structure, ensuring that the covers fit snugly, without offset or gaps. Finally, the shielding bolt connector 3 is inserted through the assembly hole of the outer shielding cover 1 and locked into the countersunk threaded hole of the conductor transition connector 2 to complete the overall assembly of the device. During normal operation, the conductor transition connector 2 stably transmits electrical energy, the outer shielding cover 1 provides all-round electromagnetic shielding, and the internal through-hole continuously convects and dissipates heat, ensuring long-term stable operation of the equipment. When the equipment needs maintenance, only the shielding bolt connector 3 needs to be removed to take off the outer shielding cover 1, allowing direct inspection and maintenance of the internal connection parts without disassembling the conductor mating structure. This makes maintenance convenient, efficient, and without equipment damage.

[0041] The present invention and its embodiments have been described above. This description is not restrictive. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A detachable conductor shielding connection device for an air-cooled GIS busbar, characterized in that, It includes an outer shield (1), a conductor transition connector (2), a shield bolt connector (3), and a conductor bolt connector (4); the outer shield (1) covers the outside of the conductor transition connector (2), and the outer shield (1) is detachably connected to the conductor transition connector (2) through the shield bolt connector (3); the conductor transition connector (2) is electrically connected to the conductor to be connected to the air GIS busbar through the conductor bolt connector (4), and the conductor bolt connector (4) is housed in the internal space of the outer shield (1).

2. The detachable conductor shielding connection device for an air GIS busbar according to claim 1, characterized in that, The outer shield (1) is composed of two semi-cylindrical shields joined together. The outer shield (1) includes a shield body and a shield support welded and fixed to the shield body. The outer shield (1) is formed by stamping and welding of thin plate and has no casting structure.

3. The detachable conductor shielding connection device for an air GIS busbar according to claim 2, characterized in that, The central angle of each half of the semi-cylindrical cover is less than 180°, the edges of the semi-cylindrical cover are rounded, and the single-sided shearing allowance of the semi-cylindrical cover is not less than 0.5mm; the two halves of the semi-cylindrical cover are assembled together without interference.

4. The detachable conductor shielding connection device for an air GIS busbar according to claim 1, characterized in that, The conductor transition connector (2) has a U-shaped groove for accommodating the conductor bolt connector (4); the conductor transition connector (2) has a countersunk hole, the bottom of which is provided with a threaded hole, and the shield bolt connector (3) passes through the threaded hole of the countersunk hole to achieve the fastening of the outer shield (1) and the conductor transition connector (2).

5. A detachable conductor shielding connection device for an air GIS busbar according to claim 4, characterized in that, The conductor transition connector (2) has a central through hole and a radial through hole that are interconnected to form a ventilation and heat dissipation channel; all sharp corners on the outer contour of the conductor transition connector (2) are rounded.

6. The detachable conductor shielding connection device for an air GIS busbar according to claim 1, characterized in that, The maximum outer diameter of the detachable conductor shielding connection device is equal to the outer diameter of the conductor to be connected.

7. A detachable conductor shielding connection device for an air GIS busbar according to claim 1, characterized in that, The outer shield (1) has two or more installation positioning positions on its inner side, and the conductor transition connector (2) has an assembly and mating structure that matches the installation positioning positions one by one.

8. A detachable conductor shielding connection device for an air GIS busbar according to claim 1, characterized in that, The intermediate conductive connection section of the conductor transition connector (2) adopts a simplified profile configuration.

9. A detachable conductor shielding connection device for an air GIS busbar according to claim 1, characterized in that, The detachable conductor shielding connection device is used for conductive transition connections between conductors of air GIS branch busbars, between conductors of three-phase common-box busbars, or between conductors and insulator inserts.

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