GIL double-layer metal particle trap and gas-insulated metal-enclosed power transmission line

Abstract

The utility model discloses a GIL double-layer metal particle trap and a gas-insulated metal-enclosed power transmission line, and relates to the field of high-voltage power transmission and transformation, the GIL double-layer metal particle trap and the gas-insulated metal-enclosed power transmission line comprise a grid-shaped trap at the top and a groove-shaped trap at the bottom, the grid-shaped trap is provided with a plurality of rectangular grids used for collecting metal particles; a trap base body of the groove-shaped trap is provided with a plurality of arrow-shaped grids, a metal particle capturing groove of the groove-shaped trap is formed, the metal particle capturing groove is of a structure with openings in the two ends being large and an opening in the middle being small and is used for restraining metal particles from escaping, and the axial section of each arrow-shaped grid is in an arrow shape. According to the double-layer metal particle trap, the grid-shaped trap is of a rectangular large-opening grid structure, the large opening can effectively improve the metal particle collecting efficiency, the groove-shaped trap is provided with the arrow-shaped grid, and the formed metal particle capturing groove captures metal particles and inhibits the escape phenomenon of the metal particles at the same time.

Description

Technical Field

[0001] The utility model relates to the field of high-voltage power transmission and transformation, in particular to a GIL double-layer metal particle trap and a gas-insulated metal-enclosed power transmission line. Background Art

[0002] The DC gas-insulated transmission line (GIL is the abbreviation of gas-insulated metal-enclosed transmission line) used in actual DC transmission projects has exposed some problems that need to be solved urgently. As the key insulating component of DC GIL, the insulation performance of the basin insulator is crucial to the safe operation of GIL. However, during the production, transportation, installation and operation of GIL, metal particles are easily generated inside it. Charged particles are subject to the combined effects of Coulomb force, gravity, etc., and may move inside the GIL or adhere to the surface of the insulator, causing serious distortion of the electric field on the surface of the insulator, triggering gas breakdown or surface flashover of the insulator, greatly reducing the insulation performance of the GIL, and is an important factor affecting the safe and reliable operation of DC transmission. The impact of metal particles on high-voltage insulation needs to be solved urgently.

[0003] At present, the main means of preventing and controlling metal particles in DC GIL is to arrange metal particle traps along the axial direction at both ends of the insulator, which can effectively inhibit the movement of metal particles. At present, most metal particle traps are single-layer, and the grid shape is mainly rectangular. Although the large area can effectively capture particles, when the kinetic energy of metal particles is large, there is a probability that they will leave the metal particle trap through collision and escape. Therefore, there is a need for a metal particle trap that can effectively capture moving metal particles inside the DC GIL and inhibit the escape of metal particles. Utility Model Content

[0004] The purpose of the utility model is to provide a GIL double-layer metal particle trap to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a GIL double-layer metal particle trap, including a grid-shaped trap at the top and a slot-shaped trap at the bottom, the grid-shaped trap has a plurality of rectangular grids for collecting metal particles; the slot-shaped trap has a plurality of metal particle capture grooves, the metal particle capture grooves are a structure with large openings at both ends and a small opening in the middle, which is used to inhibit the escape of metal particles.

[0006] Preferably, the trap base of the slot-type trap has a plurality of arrow-shaped grilles, and metal particle capture grooves of the slot-type trap are formed between adjacent arrow-shaped grilles, and the bottom of the metal particle capture groove is a sealing structure.

[0007] Preferably, the axial cross-section of the arrow-shaped grid between adjacent metal particle capturing grooves is arrow-shaped.

[0008] Preferably, the top of the arrow-shaped grid is a pointed structure, and when the metal particles move to the top of the arrow-shaped grid, a collision occurs, which consumes the kinetic energy of the metal particles, and the metal particles can fall into the metal particle capture groove.

[0009] Preferably, the diagonal ratio of the rhombus part of the arrow-shaped grille is 1.5:1.

[0010] Preferably, the lengths of the rectangular grid and the arrow-shaped grid are both 30 cm, the height of the rectangular grid is 1.5 cm, and the width is 3.5 cm; the height of the grid of the slot-type trap is 3.0 cm.

[0011] Preferably, the spacing between adjacent rectangular grids is 0.8 cm, and the spacing between adjacent arrow-shaped grids is 1.0 cm.

[0012] Preferably, the interval between the base of the grid-shaped trap and the base of the slot-shaped trap is 4.0 cm.

[0013] A gas-insulated metal-enclosed transmission line comprises a shell of the gas-insulated metal-enclosed transmission line, a high-voltage guide rod is arranged at the center of the shell, and the above-mentioned GIL double-layer metal particle trap is arranged in the middle area of ​​the bottom of the shell.

[0014] Preferably, the radius of the bottom groove-shaped trap portion of the GIL double-layer metal particle trap is the same as the inner radius of the casing of the gas-insulated metal enclosed transmission line.

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

[0016] The grid-shaped trap of the double-layer metal particle trap of the utility model adopts a rectangular large-opening grid structure, and the large opening can effectively increase the efficiency of collecting metal particles. The slot-shaped trap has an arrow-shaped grid, and the formed metal particle capture groove can capture metal particles while suppressing the escape of metal particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the GIL double-layer metal particle trap;

[0018] Figure 2 Layout diagram of the GIL double-layer metal particle trap.

[0019] In the figure: 1. rectangular grid; 2. arrow-shaped grid; 3. metal particle capture groove; 4. trap matrix; 5. shell 6. high-voltage guide rod. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] like Figure 1 As shown, this embodiment provides a GIL double-layer metal particle trap, including a top grid-shaped trap and a bottom slot-shaped trap, the grid-shaped trap substrate and the slot-shaped trap substrate are spaced 4.0 cm apart; the grid-shaped trap has a plurality of rectangular grids 1 on its trap substrate 4, which can increase the probability of capturing metal particles, while the slot-shaped trap has a plurality of arrow-shaped grids 2, and the formed metal particle capturing groove 3 has a structure with large openings at both ends and a small opening in the middle, which can suppress the escape of metal particles.

[0022] The trap base 4 of the slot trap has multiple arrow-shaped grilles 2, forming a metal particle capture slot 3 of the slot trap. The bottom of the metal particle capture slot 3 is a sealed structure. This structure with a small middle opening and large upper and lower openings can prevent the further movement of metal particles, effectively inhibit the escape of metal particles, and increase the probability of metal particle capture.

[0023] The axial section of the arrow-shaped grid between adjacent metal particle capture slots in the slot trap is arrow-shaped, e.g. Figure 1 shown.

[0024] The top of the arrow-shaped grille of the slot trap is a pointed structure. When metal particles move to the top of the arrow-shaped grille, they collide, consuming the kinetic energy of the metal particles and falling into the metal particle capture slot, thus preventing the metal particles from escaping from the rectangular grille 1 of the grid trap after colliding with the DC GIL housing. This further increases the probability of capturing metal particles.

[0025] The arrow-shaped grid height of the slot trap is designed to be 3 cm, which can effectively capture metal particles with sizes ranging from micrometers to millimeters. Larger metal particles have lower speeds and a lower probability of jumping, and pose a general threat to the DC GIL, so they are usually not considered.

[0026] The diagonal ratio of the diamond part of the arrow-shaped grille of the slot trap is 1.5:1. The metal particle capture groove formed by this arrow-shaped grille can effectively increase the probability of metal particle capture and inhibit the escape of metal particles compared to the traditional flat grille structure.

[0027] The length of the rectangular grid and the arrow-shaped grid is designed to be 30 cm, which effectively increases the probability of capturing metal particles while saving the use of materials; the spacing between adjacent rectangular grids is 0.8 cm, and the spacing between adjacent arrow-shaped grids is 1.0 cm, which ensures that large-sized metal particles can be collected by the grid trap while reducing the probability of metal particles escaping from the slot trap due to collision.

[0028] The grid trap and the slot trap have different capture effects on particles. The grid trap has a larger opening and a smaller depth, and the probability of particle entry is higher. It has a better capture effect on particles with larger size and smaller speed, but has a limited capture effect on particles with smaller size and faster speed, and particles often escape; the slot trap has a smaller opening and a larger depth, and has a better capture effect on particles of different sizes and speeds, and the probability of particle escape is lower, but its opening is smaller, the probability of particle entry is lower, and its irregular structure will increase the range of motion of particles after collision and escape. The combined structure of the grid trap and the slot trap not only allows particles that are difficult to capture by the grid trap to be captured by the slot trap below, but also allows particles that escape from the slot trap to be further captured by the grid trap, which increases the probability of metal particle capture and limits the range of particle motion. In addition, the relatively smooth surface structure of the grid trap can reduce the influence of the installation of the metal particle trap on the degree of electric field distortion inside the DC GIL, and avoid tip discharge between the DC GIL high-voltage guide rod and the arrow-shaped grid of the slot trap at the bottom of the double-layer metal particle trap.

[0029] Since the main forces affecting the movement of metal particles are the vertical downward gravity and the radial electric field force, the main landing point of the metal particles is concentrated in the middle area at the bottom of the DC GIL. Figure 2 The gas-insulated metal enclosed transmission line shown comprises a gas-insulated metal enclosed transmission line casing 5, a central high-voltage conductor 6, and a GIL double-layer metal particle trap arranged along the inner wall of the DC GIL casing, wherein the radius of the GIL double-layer metal particle trap is the same as the inner radius of the gas-insulated metal enclosed transmission line casing.

[0030] The arc of the GIL double-layer metal particle trap is 120°, covering most possible movement ranges of metal particles inside the DC GIL. The bottom of the groove trap fits tightly with the casing 5 of the gas-insulated metal-enclosed transmission line, facilitating assembly while improving the stability of the device fixation.

[0031] The above-mentioned GIL double-layer metal particle trap is arranged on both sides of the gas-insulated metal-enclosed transmission line insulator, which can effectively capture metal particles and inhibit the movement and escape of metal particles, thereby reducing the possibility of insulation accidents of the gas-insulated metal-enclosed transmission line caused by metal particles.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A GIL double-layer metal particle trap, characterized in that: It includes a grid-shaped trap at the top and a slot-shaped trap at the bottom. The grid-shaped trap has multiple rectangular grids for collecting metal particles; the slot-shaped trap has multiple metal particle capture slots, which have large openings at both ends and a small opening in the middle, and are used to inhibit the escape of metal particles.

2. A GIL double-layer metal particle trap according to claim 1, characterized in that: The trap base of the slot-type trap is provided with a plurality of arrow-shaped grilles, and metal particle capturing grooves of the slot-type trap are formed between adjacent arrow-shaped grilles, and the bottom of the metal particle capturing groove is a sealing structure.

3. A GIL double-layer metal particle trap according to claim 2, characterized in that: The axial section of the arrow-shaped grille is arrow-shaped.

4. A GIL double-layer metal particle trap according to claim 3, characterized in that: The top of the arrow-shaped grid is a pointed structure. When the metal particles move to the top of the arrow-shaped grid, a collision occurs, which consumes the kinetic energy of the metal particles, and the metal particles can fall into the metal particle capture groove.

5. A GIL double-layer metal particle trap according to claim 3, characterized in that: The diagonal ratio of the rhombus part of the arrow-shaped grille is 1.5:

1.

6. A GIL double-layer metal particle trap according to claim 1, characterized in that: The lengths of the rectangular grid and the arrow-shaped grid are both 30 cm, the height of the rectangular grid is 1.5 cm, and the width is 3.5 cm; the height of the grid of the slot-shaped trap is 3.0 cm.

7. The GIL double-layer metal particle trap according to claim 1, characterized in that: The spacing between adjacent rectangular grids is 0.8 cm, and the spacing between adjacent arrow-shaped grids is 1.0 cm.

8. The GIL double-layer metal particle trap according to claim 1, characterized in that: The interval between the base of the grid-shaped trap and the base of the slot-shaped trap is 4.0 cm.

9. A gas-insulated metal-enclosed transmission line, characterized in that: The invention comprises a shell of a gas-insulated metal-enclosed power transmission line, a high-voltage guide rod is arranged at the center of the shell, and a GIL double-layer metal particle trap as claimed in any one of claims 1 to 8 is arranged in the middle area at the bottom of the shell.

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