Novel GIL three-support fixed connection structure

Abstract

The utility model relates to the technical field of gas insulated transmission circuits, in particular to a novel GIL (gas insulated transmission line) three-support fixed connection structure, which comprises a shell and a conductor assembly, and the conductor assembly comprises three conductors, three insulated supports, a particle catcher and a fixed aluminum row. The three conductors are all inserted into the insulation support and are fixedly connected in a compression joint mode, the particle catcher and the insulation support are coaxially arranged, the particle catcher is installed on the upper end face of the insulation support, and the particle catcher is fixed to the insulation support through a fixing aluminum bar and a screw. The fixed aluminum bar is attached to the arc of the outer wall of the shell, two round holes are formed in the fixed aluminum bar, and the large round hole is welded to the shell. Holes are formed in the fixed aluminum bar, and a round hole welding structure is adopted, so that the stress concentration phenomenon of a welding seam is reduced, and the risk of fatigue cracking of the welding seam is reduced.

Description

Technical Field

[0001] This utility model relates to the field of gas-insulated transmission circuit technology, and in particular to a novel GIL three-support fixed connection structure. Background Technology

[0002] Rigid gas-insulated transmission lines (GILs) offer advantages such as large transmission capacity, high safety performance, and long service life, and were initially mainly used in nuclear power and hydropower. With increasing electricity consumption, urban power grids have become increasingly complex, significantly impacting the urban landscape. As GIL engineering application technology matures and overall costs decrease, its application in urban underground power transmission, steel, and chemical industries is gradually increasing. GIL systems are installed by prefabricating units in the manufacturing plant and assembling them on-site. This method enables rapid construction, improves on-site installation efficiency, and reduces site occupancy costs. The GIL three-support fixed connection structure is the core of the equipment, mainly comprising three-support insulators, particle traps, and fixed aluminum busbars, primarily serving to support the conductors, ground the equipment, and trap particles.

[0003] Currently, the connection between the fixed aluminum busbar and the housing is mainly achieved through bolting and welding. When the fixed aluminum busbar is bolted to the flange, the flange size needs to be increased, and the flange needs to have a positioning groove for the aluminum busbar, increasing the processing steps. Therefore, some equipment manufacturers use welding as the fixing method. When welding is used, the aluminum busbar and the housing are mostly welded on three sides in a U-shape, and stress concentration is inevitable at the weld seam. Under the influence of random vibration during long-distance unit transportation and electromagnetic force vibration during long-term operation under electrification, the weld seam of the fixed aluminum busbar is at risk of fatigue cracking. In addition, the particle catcher is a ring-shaped thin plate structure. Due to manufacturing process and storage conditions, there are often out-of-roundness issues, making it difficult to install the three-support fixing structure smoothly. Subsequent roundness correction processes are required, reducing overall production efficiency. Utility Model Content

[0004] The purpose of this invention is to address the risk of fatigue cracking in the welds of the fixed aluminum busbar under the influence of random vibration during long-distance unit transportation and electromagnetic force vibration during long-term energized operation, and to propose a novel GIL three-support fixed connection structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A novel GIL three-support fixed connection structure includes a housing and a conductor assembly, wherein the conductor assembly includes three conductors, an insulating three-support structure, a particle trap and a fixed aluminum busbar.

[0007] All three conductors are inserted into the insulating three supports and fixedly connected by crimping. The particle catcher is arranged coaxially with the insulating three supports and is installed on the upper end face of the insulating three supports. The particle catcher is fixed to the insulating three supports by screws through a fixing aluminum busbar.

[0008] The fixed aluminum busbar fits in an arc shape with the outer wall of the shell, and the fixed aluminum busbar is provided with two round holes, with the larger round hole being welded to the shell.

[0009] As a preferred technical solution of this utility model, the outer ends of the three pillars of the insulating three-support are provided with metal inserts, and the small round holes on the fixed aluminum busbar are bolted to the metal inserts at the outer ends of the insulating three-support by fixing screws.

[0010] The aforementioned components achieve the following effects: improve the connection between the fixed aluminum busbar and the insulating three supports, and facilitate the clamping and fixing of the particle catcher.

[0011] As a preferred embodiment of this invention, a nylon pad is provided above the fixing screw.

[0012] The effect achieved by the above components is to prevent the ends of the fixing screws that fix the aluminum busbar from bumping or scratching the inner wall of the housing during the installation of the conductor assembly.

[0013] As a preferred embodiment of this utility model, the particle trap is provided with multiple waist-shaped holes, and the outer walls on both sides of the particle trap are provided with two outwardly protruding arc-shaped reinforcing ribs.

[0014] The effects achieved by the above components are as follows: the waist-shaped hole can collect foreign objects generated during installation, preventing particles from adsorbing onto the insulating parts and causing excessively high local electric fields, which in turn can lead to surface flashover; the arc-shaped reinforcing ribs improve the roundness of the particle catcher while ensuring that the electric field distribution is not affected.

[0015] The beneficial effects of this utility model are:

[0016] 1. This device reduces stress concentration in the weld by opening holes in the fixed aluminum busbar and adopting a round hole welding structure, thereby reducing the risk of weld fatigue cracking.

[0017] 2. By adding raised rib-like structures to the particle catcher, the rigidity is increased, thereby ensuring the roundness of the particle catcher and facilitating the smooth installation of the three-support fixing structure later. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a novel GIL three-support fixed connection structure proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the conductor assembly in a novel GIL three-support fixed connection structure proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the connection between the fixed aluminum busbar and the insulating three-braced joint in a novel GIL three-braced fixed connection structure proposed in this utility model.

[0021] Figure 4 This is a schematic diagram of the particle trap in a novel GIL three-support fixed connection structure proposed in this utility model;

[0022] Figure 5 This is a schematic diagram of the fixed aluminum busbar in a novel GIL three-support fixed connection structure proposed in this utility model.

[0023] In the diagram: 1. Housing; 2. Conductor assembly; 2-1. Conductor; 2-2. Insulation three-way support; 2-2-1. Metal insert; 2-3. Particle catcher; 2-4. Fixed aluminum busbar; 2-5. Fixing screw; 2-6. Nylon pad. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figure 1-5 A novel GIL three-support fixed connection structure includes a housing 1 and a conductor assembly 2. The conductor assembly 2 includes three conductors 2-1, an insulating three-support 2-2, a particle trap 2-3 and a fixed aluminum busbar 2-4.

[0026] Among them, the insulating three supports 2-2 and the three conductors 2-1 are fixedly connected by crimping. The particle catcher 2-3 is arranged coaxially with the insulating three supports 2-2 and is installed on the upper end face of the insulating three supports 2-2. The particle catcher 2-3 is fixed to the insulating three supports 2-2 by screws through the fixing aluminum busbar 2-4. The outer ends of the three pillars in the insulating three supports 2-2 are provided with metal inserts 2-2-1. The small round holes on the fixing aluminum busbar 2-4 and the metal inserts 2-2-1 at the outer end of the insulating three supports 2-2 are bolted together by fixing screws 2-5.

[0027] After the conductor assembly 2 and the housing 1 are installed, the fixing aluminum busbar 2-4 needs to be welded to the housing 1. The fixing aluminum busbar 2-4 fits the arc of the outer wall of the housing 1, and there are two round holes on the fixing aluminum busbar 2-4. The larger round hole is welded to the housing 1. The welding method between the larger round hole and the housing 1 does not have a weld tip, the weld is evenly stressed, avoids the stress concentration point of the U-shaped weld, reduces weld fatigue damage caused by transportation and operation vibration, and improves product safety performance.

[0028] To prevent the fixing screws 2-5 at the ends of the aluminum busbars 2-4 from bumping or scratching the inner wall of the housing 1 during the installation of conductor assembly 2, a nylon pad 2-6 is placed above the fixing screws 2-5.

[0029] Secondly, the particle trap 2-3 is provided with multiple waist-shaped holes. The waist-shaped holes can collect foreign objects generated during installation, preventing particles from adhering to the insulating parts and causing excessively high local electric fields, which could lead to surface flashover. In addition, the outer walls of both sides of the particle trap 2-3 are provided with two outwardly protruding arc-shaped reinforcing ribs. The arc-shaped reinforcing ribs improve the roundness of the particle trap 2-3 and ensure that the electric field distribution is not affected. The particle trap 2-3 is a thin plate structure, and it is extremely difficult to ensure roundness in the manufacturing process. In addition, deformation is prone to occur during the storage stage. The use of reinforcing ribs can improve roundness and prevent deformation from causing installation interference.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A novel GIL three-support fixed connection structure, comprising a shell (1) and a conductor assembly (2), characterized in that, The conductor assembly (2) includes three conductors (2-1), three insulating supports (2-2), a particle trap (2-3), and a fixed aluminum busbar (2-4); The three conductors (2-1) are all inserted into the insulating three-bracket (2-2) and fixedly connected by crimping. The particle catcher (2-3) is arranged coaxially with the insulating three-bracket (2-2) and is installed on the upper end face of the insulating three-bracket (2-2). The particle catcher (2-3) is fixed to the insulating three-bracket (2-2) with screws by fixing aluminum busbar (2-4). The fixed aluminum busbar (2-4) is arc-shaped and fits against the outer wall of the shell (1), and the fixed aluminum busbar (2-4) is provided with two round holes, with the larger round hole being welded to the shell (1).

2. The novel GIL three-support fixed connection structure according to claim 1, characterized in that, The outer ends of the three pillars in the insulating three-support (2-2) are provided with metal inserts (2-2-1), and the small round holes on the fixed aluminum busbar (2-4) are bolted to the metal inserts (2-2-1) at the outer ends of the insulating three-support (2-2) by fixing screws (2-5).

3. The novel GIL three-support fixed connection structure according to claim 2, characterized in that, A nylon washer (2-6) is provided above the fixing screw (2-5).

4. The novel GIL three-support fixed connection structure according to claim 1, characterized in that, The particle trap (2-3) is provided with multiple waist-shaped holes, and the outer walls on both sides of the particle trap (2-3) are provided with two outwardly protruding arc-shaped reinforcing ribs.

Images