800kV GIL basin connection structure

Abstract

The utility model relates to the technical field of GIL equipment, in particular to an 800kV GIL basin connecting structure which comprises a first shell, a basin assembly, a second shell, a shield, a shaft head, a long particle catcher and a short particle catcher. The short particle catcher and the long particle catcher are respectively arranged on the inner walls of the first shell and the second shell; the basin assembly is installed in the second welding neck flange, the basin assembly comprises a basin-type insulator, a contact finger seat and a basin pressing block, the shaft head is connected with the basin-type insulator through a bolt, and the outer side of the shaft head is coated with a shield. By designing the convex arc at the tail end of the contact finger seat, the electric field distribution is uniform, and the use of shielding parts is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of GIL equipment, in particular to an 800kV GIL basin connection structure. Background Art

[0002] With the increasing demand for clean energy sources such as wind, hydro, and solar power, and especially with the growing number of planned pumped-storage power plants, there is an urgent need to address the requirements of ultra-high voltage and vertical drop power transmission. Rigid gas-insulated transmission lines (GILs), with their advantages of high transmission capacity, high safety, and long service life, can effectively address the challenges of high-voltage and high-drop power transmission. The pot insulator is a crucial component in the entire GIL system, primarily supporting the conductors within the casing and separating the gas chambers. Currently, pot insulator connections primarily utilize a pre-cast center conductor connected to the two side conductors. Conductor connection methods can be broadly categorized as fixed or sliding. Regardless of the connection method, due to the discontinuity of the conductors, rounded shielding components are often required to address electric field distortion. The increasing number and variety of components inevitably increases product assembly complexity and reduces product standardization.

[0003] Currently, there are two main types of pot-type insulator structures: internal and external. The external pot has a metal flange pre-cast on the outer edge. This metal flange requires a sealing groove, which increases the number of sealing surfaces and is not conducive to ensuring airtightness. The internal pot structure reduces the number of sealing surfaces to a certain extent, improving the product's airtight reliability. Currently, most internal pots are machined by machining rectangular grooves at different positions on the circumference of the high-neck flange. Small pressure blocks are used in the grooves to fix the pot insulator. This method greatly increases the difficulty of machining the high-neck flange, which is time-consuming and labor-intensive. In addition, the contact seat of the UHV pot insulator requires additional large shielding components to adjust the electric field and achieve the goal of uniform electric field distribution. Utility Model Content

[0004] The purpose of the utility model is to solve the defect that the pot-type insulator in the prior art cannot meet the use requirements, and to propose an 800kV GIL pot connection structure.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An 800kV GIL basin connection structure includes a first housing, a basin assembly, a second housing, a shield, a shaft head, a long particle catcher, and a short particle catcher. The first and second housings are provided with a first high-neck flange and a second high-neck flange at their respective ends adjacent to each other. The short particle catcher and the long particle catcher are mounted on the inner walls of the first and second housings, respectively.

[0007] The basin assembly is installed in the second high-neck flange, and the basin assembly includes a basin insulator, a contact finger seat and a basin pressing block. The shaft head is connected to the basin insulator through bolts, and the outer side of the shaft head is covered with a shield;

[0008] The pot insulator consists of a center conductor, a shield and a spring assembly.

[0009] As a preferred technical solution of the present invention, the central conductor and the shielding spring are assembled by epoxy casting to form a pot-type insulator.

[0010] As an optimal technical solution of the present invention, the shielding spring assembly includes a spring and a grounding terminal. There are two grounding terminals, which are located at both ends of the spring to ensure reliable connection with the inner wall of the flange and realize the grounding function; the contact seat and the center conductor are connected by bolts.

[0011] As a preferred technical solution of the present invention, the contact finger seat and the center conductor are connected by bolts, and the end of the contact finger seat is designed with a convex curve to evenly distribute the field strength here, acting as a shielding part. At least two different parts in the past are merged into one part with almost the same functions, reducing the types and quantity of parts and effectively improving assembly efficiency.

[0012] As an optimal technical solution of the present invention, the parts of the circumference of the first high-neck flange and the second high-neck flange used to install the basin pressing block are processed by an overall removal processing method to process the annular groove, which reduces the difficulty of flange machining while maintaining the original installation function and flange strength, and improves production efficiency.

[0013] As an optimal technical solution of the present invention, the number of basin pressing blocks on the first high-neck flange and the second high-neck flange is four to seven, ensuring the stability of the basin pressing blocks when assembled in the flange grooves and avoiding slippage.

[0014] The beneficial effects of the utility model are:

[0015] 1. This device has a convex arc design at the end of the finger seat to evenly distribute the electric field and reduce the use of shielding parts;

[0016] 2. A total of 4 shielding springs and 8 grounding points are used on the circumference of the basin insulator, which makes the grounding more reliable and ensures the electric field regulation function of the shield;

[0017] 3. Use the built-in basin solution to reduce the number of sealing surfaces and improve sealing reliability;

[0018] 4. The basin pressing block mounting hole of the high neck flange is integrally turned and formed, and the positioning hole is relatively milled to simplify the processing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of an 800kV GIL basin connection structure proposed in the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of a high-neck flange in an 800kV GIL basin connection structure proposed in the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the basin assembly in an 800kV GIL basin connection structure proposed in the utility model;

[0022] Figure 4 This is a structural schematic diagram of a pot-type insulator in an 800kV GIL pot connection structure proposed in the utility model;

[0023] Figure 5 This is a structural schematic diagram of a contact finger seat in an 800kV GIL basin connection structure proposed in the utility model;

[0024] Figure 6 This is a structural schematic diagram of a basin pressing block in an 800kV GIL basin connection structure proposed in the utility model;

[0025] Figure 7 This is a structural schematic diagram of the shielding spring assembly in an 800kV GIL basin connection structure proposed by the utility model.

[0026] In the figure: 1. First shell; 1-1. First high-neck flange; 2. Basin assembly; 2-1. Basin insulator; 2-2-1. Center conductor; 2-2-2. Shield spring assembly; 2-2-2-1. Spring; 2-2-2-2. Grounding terminal; 2-2. Contact finger seat; 2-3. Basin pressure block; 3. Second shell; 3-1. Second high-neck flange; 4. Shield; 5. Shaft head; 6. Long particle catcher; 7. Short particle catcher. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-7An 800kV GIL basin connection structure includes a first shell 1, a basin assembly 2, a second shell 3, a shield 4, a shaft head 5, a long particle catcher 6, and a short particle catcher 7. A first high-neck flange 1-1 and a second high-neck flange 3-1 are respectively provided at the ends of the first shell 1 and the second shell 3 that are close to each other, and the short particle catcher 7 and the long particle catcher 6 are respectively installed on the inner walls of the first shell 1 and the second shell 3.

[0029] The circumference of the first high-neck flange 1-1 and the second high-neck flange 3-1 used to install the basin pressing block 2-3 is processed by the overall removal processing method to reduce the difficulty of flange machining while maintaining the original installation function and flange strength, and improve production efficiency. The number of basin pressing blocks 2-3 on the first high-neck flange 1-1 and the second high-neck flange 3-1 is four to seven, ensuring the stability of the basin pressing block 2-3 assembled in the flange groove and avoiding slippage.

[0030] The basin assembly 2 is installed in the second high-neck flange 3-1. The basin assembly 2 includes a basin insulator 2-1, a contact finger seat 2-2, and a basin pressing block 2-3. The shaft head 5 is connected to the basin insulator 2-1 by bolts. The outer side of the shaft head 5 is covered with a shield 4 to achieve a uniform electric field.

[0031] After the basin assembly 2 is completed, it is placed in the corresponding notch of the second high-neck flange 3-1. The outer edge of the basin insulator 2-1 and the notch of the second high-neck flange 3-1 are clearance-fitted, and the basin pressing block 2-3 is used to fix it;

[0032] Among them, the pot-type insulator 2-1 includes a center conductor 2-2-1 and a shielding spring assembly 2-2-2. The center conductor 2-2-1 and the shielding spring assembly 2-2-2 are formed into a pot-type insulator 2-1 by epoxy pouring. The shielding spring assembly 2-2-2 includes a spring 2-2-2-1 and a grounding terminal 2-2-2-2. There are two grounding terminals 2-2-2-2, which are located at both ends of the spring 2-2-2-1 to ensure reliable connection with the inner wall of the flange and realize the grounding function; the contact finger seat 2-2 and the center conductor 2-2-1 are connected by bolts, and the end of the contact finger seat 2-2 is designed with an outward convex curve to uniformly distribute the field strength here, playing the role of a shielding part. At least two different parts in the past are merged into one part with almost the same function, reducing the types and quantity of parts and effectively improving assembly efficiency.

[0033] In this embodiment, a built-in basin solution is adopted, and the metal flange on the outside of the basin is eliminated, so that the basin is assembled as a whole in the internal area of ​​the shell, realizing direct connection between the shell flanges on both sides, and reducing the number of sealing surfaces to 50% of the original number, thereby greatly improving the sealing reliability of the product.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An 800kV GIL basin connection structure, comprising a first housing (1), a basin assembly (2), a second housing (3), a shield (4), a shaft head (5), a long particle catcher (6) and a short particle catcher (7), characterized in that: A first high-neck flange (1-1) and a second high-neck flange (3-1) are respectively provided at the ends of the first shell (1) and the second shell (3) close to each other, and a short particle catcher (7) and a long particle catcher (6) are respectively installed on the inner walls of the first shell (1) and the second shell (3); The basin assembly (2) is installed in the second high-neck flange (3-1), and the basin assembly (2) includes a basin insulator (2-1), a contact finger seat (2-2) and a basin pressing block (2-3); the shaft head (5) is connected to the basin insulator (2-1) by bolts, and the outer side of the shaft head (5) is covered with a shield (4); The pot-type insulator (2-1) comprises a central conductor (2-2-1) and a shield spring assembly (2-2-2).

2. The 800kV GIL basin connection structure according to claim 1, characterized in that: The central conductor (2-2-1) and the shielding spring assembly (2-2-2) are formed into a pot-type insulator (2-1) by epoxy casting.

3. The 800kV GIL basin connection structure according to claim 1, characterized in that: The shielding spring assembly (2-2-2) comprises a spring (2-2-2-1) and a grounding terminal (2-2-2-2). There are two grounding terminals (2-2-2-2), which are respectively located at two ends of the spring (2-2-2-1).

4. The 800kV GIL basin connection structure according to claim 1, characterized in that: The contact finger seat (2-2) and the central conductor (2-2-1) are connected by bolts, and the end of the contact finger seat (2-2) is designed with an outward convex curve.

5. The 800kV GIL basin connection structure according to claim 4, characterized in that: The annular grooves are machined in the circumference of the first high-neck flange (1-1) and the second high-neck flange (3-1) at the locations where the basin pressing blocks (2-3) are mounted, using an integral removal processing method.

6. The 800kV GIL basin connection structure according to claim 5, characterized in that The number of basin pressing blocks (2-3) on the first high-neck flange (1-1) and the second high-neck flange (3-1) is four to seven.

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