Three-post insulator mounting structure for GIL

Abstract

The invention provides a three-post insulator mounting structure for a GIL (Gas Insulated Line), which comprises a three-post insulator, an embedded cylinder, a transition ring and a conducting rod, the three-post insulator and the embedded cylinder are integrally formed by casting, and the three-post insulator mounting structure is characterized by further comprising a crimping ring and a guide ring. The transition ring is pressed between the crimping ring and the conducting rod, the transition ring, the conducting rod and the crimping ring are in interference fit, and the crimping ring is subjected to closing-in crimping after the transition ring is pressed in, so that the crimping ring is completely fixed on the conducting rod, and then the three-post insulator is fixed on the conducting rod. According to the invention, the problem that the embedded cylinder is easily stripped from the three-post insulator due to interference assembly and transportation jolt of the three-post insulator can be effectively improved, the rejection rate in the product assembly process is greatly reduced, and the assembly cost is reduced; and meanwhile, the influence caused by bumping in the transportation process is reduced, and the insulation reliability of the product is improved, so that remarkable economical efficiency is achieved.

Description

Technical Field

[0001] The invention relates to the field of gas-insulated high-voltage transmission lines, in particular to a three-pillar insulator installation structure for a GIL. Background Art

[0002] Gas-insulated high-voltage transmission line (GIL) is a high-voltage, high-current power transmission equipment that uses gas insulation and coaxial arrangement of the shell and conductor. It is a new transmission method after traditional overhead transmission lines and underground cables. The total length of busbar 730-1200kV voltage level GIL put into use worldwide is nearly 80km, and it has more than 40 years of stable operation experience abroad.

[0003] At present, there are two main technical routes for GIL in the world. One is represented by AZZ, which adopts flange installation, uses pure SF6 as the insulating medium, and uses three pillars and pot insulators. Its structure is relatively complex, similar to the GIS structure, with slightly higher cost, but lower process requirements. The other is represented by Siemens, with the shell completely welded, rarely using flange connection, and using pure SF6. 6 or SF 6 / N 6 Mixed gas, SF in the future 6 Complete replacement.

[0004] The main domestic GIL manufacturers include Xikai, Pinggao, New Northeast and Nanrui Hengchi, all of which have completed the technical reserves of GIL. 6 As a strong greenhouse gas, it has a great impact on the environment. It has a strong greenhouse effect (global warming potential GWP is 23500) and is listed as one of the six greenhouse gases to be restricted in the Kyoto Protocol. 6 Gas usage may seek to completely replace SF 6 Environmentally friendly gases have become an important research direction of GIL at home and abroad.

[0005] like Figure 1 As shown, the conventional three-pillar insulator assembly structure consists of a three-pillar insulator 1, an embedded cylinder 2, a transition ring 3, and a conductive rod 4. The three-pillar insulator 1 and the embedded cylinder 2 are cast as one piece. When assembled with the conductive rod 4, the transition ring 3 is pressed into the space between the embedded cylinder 2 and the conductive rod 4 by a crimping tool to form an interference fit, and then the embedded cylinder 2 is closed to complete the crimping assembly.

[0006] In the process of press-fitting the transition ring 3 with interference fit, the embedded cylinder 2 is subjected to radial outward stress, which easily leads to a gap between the cast connection surface of the embedded cylinder 2 and the three-pillar insulator 1. In addition, after the overall crimping is completed, there is a gap between the embedded cylinder 2 and the conductive rod 4. The embedded cylinder 2, as a transition piece connecting the three-pillar insulator 1 and the conductive rod 4, is subjected to the vibration force of the three-pillar insulator 1 during the bumpy transportation process, which is also easy to cause a gap between the embedded part and the three-pillar insulator cast connection surface, resulting in assembly waste and reduced product insulation reliability. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a three-pillar insulator installation structure for GIL, reduce the scrap rate in the product assembly process, reduce the assembly cost, and improve the insulation reliability of the product.

[0008] A three-pillar insulator installation structure for GIL includes a three-pillar insulator, an embedded cylinder, a transition ring, and a conductive rod. The three-pillar insulator and the embedded cylinder are integrally cast and molded. The structure is characterized in that it also includes a crimping ring and a guide ring. After the crimping ring is pressed toward the three-pillar insulator by a tool, the transition ring is pressed between the crimping ring and the conductive rod. The transition ring, the conductive rod and the crimping ring are interference fit. After the transition ring is pressed in, the crimping ring is crimped to make it completely fixed on the conductive rod, thereby fixing the three-pillar insulator on the conductive rod. .

[0009] Furthermore, the embedded cylinder and the crimping ring are correspondingly designed with matching teeth, and after assembly, the three-pillar insulator is prevented from rotating by relying on the matching between the teeth.

[0010] Furthermore, a guide ring is provided between the embedded cylinder and the conductive rod to fill the gap between the three-pillar insulator and the conductive rod, so as to prevent the three-pillar insulator from vibrating radially along the conductive rod during transportation.

[0011] Furthermore, crimping ring limiting structures are provided at both ends of the three-pillar insulator.

[0012] Furthermore, the transition ring is a wedge-shaped ring, which is pressed between the crimping ring and the conductive rod through interference fit of a tooling.

[0013] Furthermore, the end face of the embedded cylinder is higher than the end face of the three-pillar insulator by a distance of one tooth height.

[0014] Furthermore, the embedded cylinder is provided with two tooth grooves, and the crimping ring is provided with two teeth.

[0015] Furthermore, the inner wall of the embedded cylinder is provided with two guide grooves, which are located below the three-pillar insulator and symmetrically distributed along the center line.

[0016] Furthermore, the number of the guide rings is 2, which are located below the three-pillar insulator and symmetrically distributed along the center line of the three-pillar insulator to support the three-pillar insulator.

[0017] Furthermore, the guide ring is made of polytetrafluoroethylene.

[0018] The present invention improves the assembly structure of the three-pillar insulator, that is, shortens the embedded cylinder of the three-pillar insulator, adds crimping rings at both ends of the three-pillar insulator installation position, and fixes the crimping rings and the conductive rod by interference crimping. The crimping rings at both ends are fixed to achieve the effect of fixing the three-pillar insulator, avoiding direct crimping of the embedded cylinder to cause the embedded cylinder of the three-pillar insulator to be subjected to radial force; a guide ring is added inside the embedded cylinder of the three-pillar insulator to avoid a gap between the embedded cylinder and the conductive rod, and to prevent the three-pillar insulator from vibrating radially during transportation. The present invention greatly reduces the scrap rate during product assembly and reduces assembly costs; at the same time, it reduces the impact of bumps during transportation and improves product insulation reliability, thus having significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the traditional three-pillar insulator assembly structure;

[0020] Figure 2 It is a structural schematic diagram of a three-pillar insulator installation structure for GIL of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the embedded cylinder of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the crimping ring of the present invention.

[0023] In the figure: 1. Three-pillar insulator; 2. Embedded cylinder; 3. Transition ring; 4. Conducting rod; 5. Crimping ring; 6. Guide ring; DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 2-4 An embodiment of the present invention provides a three-pillar insulator installation structure for a GIL, comprising a three-pillar insulator 1, an embedded cylinder 2, a transition ring 3, a conductive rod 4, a crimping ring 5, and a guide ring 6.

[0026] The three-pillar insulator 1 and the embedded cylinder 2 are integrally cast, and crimping rings 5 ​​are added on both sides during assembly. After the crimping ring 5 is pressed toward the three-pillar insulator 1 by the tooling, the transition ring 3 is pressed between the crimping ring 5 and the conductive rod 4. The three are interference fit. After the transition ring 3 is pressed in, the crimping ring 5 is crimped. Preferably, the transition ring 3 is a wedge-shaped ring, which is pressed between the crimping ring 5 and the conductive rod 4 by the interference fit of the tooling. In this way, the crimping ring 5 can be completely fixed on the conductive rod 4, so that the three-pillar insulator 1 is fixed at a specified position and cannot move axially. The crimping ring limit structure can be set at both ends of the three-pillar insulator 1.

[0027] like Figure 3 , Figure 4 As shown, the embedded cylinder 2 and the crimping ring 5 are correspondingly designed with matching teeth, and the three-pillar insulator 1 can be prevented from rotating by the matching between the teeth after assembly. Specifically, the embedded cylinder 2 is provided with 2 tooth grooves, and the crimping ring 5 is provided with 2 teeth. The inner wall of the embedded cylinder 2 is provided with 2 guide grooves, which are located below the three-pillar insulator 1 and symmetrically distributed along the center line.

[0028] The edge of the embedded cylinder 2 is shortened to a distance higher than the end face of the three-pillar insulator by one tooth height, and a guide ring 6 is provided between the embedded cylinder 2 and the conductive rod 4. The guide ring 6 is used to fill the gap between the three-pillar insulator 1 and the conductive rod 4, and can prevent the three-pillar insulator 1 from moving radially along the conductive rod 4 during transportation. The number of the guide rings 6 can be 2, which are located below the three-pillar insulator and symmetrically distributed along the center line of the three-pillar insulator 1 to support the three-pillar insulator 1. Preferably, the guide ring 6 is made of polytetrafluoroethylene.

[0029] Based on the above improvements, the three-pillar insulator 1 cannot move radially or axially, nor can it rotate, thereby achieving the purpose of fixing the three-pillar insulator 1. During the interference crimping and transportation process, the embedded cylinder 2 is not subjected to radial force, and will not affect the casting connection surface between the embedded cylinder 2 and the three-pillar insulator 1, solving the problem that gaps are easily generated due to force at this position.

[0030] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A three-post insulator installation structure for GIL, comprising a three-post insulator, an embedded cylinder, a transition ring, and a conductive rod, wherein the three-post insulator and the embedded cylinder are integrally cast, and characterized in that: It also includes a crimping ring and a guide ring. After the crimping ring is pressed toward the three-pillar insulator using a tool, the transition ring is pressed between the crimping ring and the conductive rod. The transition ring, the conductive rod and the crimping ring are interference fit. After the transition ring is pressed in, the crimping ring is crimped to make the crimping ring completely fixed on the conductive rod, thereby fixing the three-pillar insulator on the conductive rod.

2. The three-post insulator mounting structure for GIL according to claim 1, characterized in that: The embedded cylinder and the crimping ring are correspondingly designed with matching teeth, and after assembly, the three-pillar insulator is prevented from rotating by relying on the matching between the teeth.

3. The three-pillar insulator mounting structure for GIL according to claim 1, characterized in that: A guide ring is arranged between the embedded cylinder and the conductive rod to fill the gap between the three-pillar insulator and the conductive rod to prevent the three-pillar insulator from vibrating radially along the conductive rod during transportation.

4. The three-post insulator mounting structure for GIL according to claim 1, characterized in that: A crimping ring limiting structure is provided at both ends of the three-pillar insulator.

5. The three-pillar insulator installation structure for GIL according to claim 4, characterized in that: The transition ring is a wedge-shaped circular ring, which is pressed between the crimping ring and the conductive rod through interference fit of a tooling.

6. The three-post insulator mounting structure for GIL according to claim 2, characterized in that: The end face of the embedded cylinder is higher than the end face of the three-pillar insulator by a distance of a tooth height.

7. The three-post insulator mounting structure for GIL according to claim 2, characterized in that: The embedded cylinder is provided with two tooth grooves, and the crimping ring is provided with two teeth.

8. The three-post insulator mounting structure for GIL according to claim 3, characterized in that: The inner wall of the embedded cylinder is provided with two guide grooves, which are located below the three-pillar insulator and symmetrically distributed along the center line.

9. The three-post insulator mounting structure for GIL according to claim 3, characterized in that: There are two guide rings, which are located below the three-pillar insulator and symmetrically distributed along the center line of the three-pillar insulator, and are used to support the three-pillar insulator.

10. The three-post insulator mounting structure for GIL according to claim 3, characterized in that: The guide ring is made of polytetrafluoroethylene.

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