Multi-gap lightning protection device

Abstract

The utility model discloses a multi-gap lightning protection device which comprises an insulating rod, two ends of the insulating rod are respectively connected with an upper connecting fitting and a lower connecting fitting, an insulating disc is coaxially arranged on the insulating rod, and the multi-gap lightning protection device is characterized in that two sides of the insulating disc are respectively provided with a vertical electrode column, and the two electrode columns are close to the edge of the insulating disc. The central angle between the two is greater than 20 degrees; a plurality of electrode balls are embedded in the insulating disc, the electrode balls are uniformly distributed at intervals along a major arc between the two electrode columns, a gap hole perpendicular to a connecting line between any electrode ball and the adjacent electrode column or between the electrode ball and the adjacent electrode column is formed, and one end of the gap hole penetrates through the surface of the insulating disc; the upper connecting fitting and the lower connecting fitting are respectively provided with an electrode column facing the insulating disc. Every two adjacent electrode columns are arranged in a spaced mode. The lightning arrester has the advantages of being simple in structure, convenient to install, capable of being operated and used in a severe environment, low in maintenance cost, large in through-flow capacity, capable of bearing direct lightning attack and the like.

Description

Technical Field

[0001] This utility model relates to the field of power grid protection technology, and in particular to a multi-gap lightning protection device. Background Technology

[0002] With the continuous development of power transmission technology, the threat of lightning strikes to the safe and stable operation of power lines has become increasingly prominent, making lightning protection and disaster mitigation a crucial aspect of new power line construction and renovation projects. Among these, the lightning protection design of power transmission lines is an indispensable and important element. Due to the difficulty in diagnosing lightning strike faults in power transmission lines, the high complexity of renovations, and the difficulty in achieving the expected results, lightning protection and disaster mitigation design for power transmission lines has become a key focus and challenge.

[0003] Currently, lightning protection for transmission lines mainly involves measures such as reducing the protection angle of the lightning conductor, installing zinc oxide surge arresters, and lowering the grounding resistance. Reducing the protection angle requires modifying the tower structure, which is difficult to design, results in heavy towers and high costs, and cannot be used for retrofitting existing transmission lines. Lowering the grounding resistance is labor-intensive and costly, highly susceptible to environmental factors, has a low cost-effectiveness ratio, and suffers from seasonal fluctuations and attenuation issues. Installing zinc oxide surge arresters can effectively reduce the lightning tripping rate, but zinc oxide surge arresters themselves have insufficient heat capacity, are prone to moisture and aging, and are susceptible to short circuits and explosions under lightning strikes. Furthermore, zinc oxide surge arresters require annual maintenance and inspection, which is labor-intensive and costly. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is: how to provide a multi-gap lightning protection device that is simple in structure, easy to install, can be used in harsh environments, has low maintenance costs, large current carrying capacity, and can withstand direct lightning strikes.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A multi-gap lightning protection device includes an insulating rod with an upper connecting hardware and a lower connecting hardware connected to its two ends. An insulating disk is coaxially mounted on the insulating rod. The device is characterized in that each side of the insulating disk has a vertically arranged electrode post, both electrode posts being close to the edge of the insulating disk, and the central angle between them being greater than 20°. Electrode balls are embedded within the insulating disk, and multiple electrode balls are evenly distributed at large arc intervals along the distance between the two electrode posts. Each electrode ball has a gap hole perpendicular to the line connecting it to an adjacent electrode post or electrode ball, one end of which penetrates the surface of the insulating disk. Both the upper and lower connecting hardware have electrode posts facing the insulating disk. Adjacent electrode posts are spaced apart.

[0007] In the above structure, due to the gap between adjacent electrode posts and the spacing between the electrode balls and adjacent electrode balls and posts, when a lightning impulse overvoltage is applied to the surge arrester, it will break down the gap between the two electrode posts, conducting to the insulating disk. The multiple evenly distributed electrode balls between the two electrode posts on the insulating disk will also be broken down, generating an electric arc. The arc is ejected through the gap holes between the electrode balls and the electrode posts or between the electrode balls, causing the arc to lengthen and the arc resistance to increase. Under the combined effect of arc voltage drop and deionization, the power frequency arc is extinguished at the first zero crossing (within 10ms), completing one lightning strike protection. The above lightning protection device can operate in harsh environments, is not afraid of pollution, requires no maintenance, has a simple structure, small size, light weight, and is easy to install.

[0008] Furthermore, the gap hole is arranged radially on the outer circular surface of the insulating disk.

[0009] Furthermore, one side of the insulating disk has a vertically arranged blind hole, which is located between two adjacent gap holes; the inner diameter of the blind hole matches the diameter of the electrode ball, and the electrode ball is tightly embedded in the blind hole.

[0010] In this way, by using blind holes on the insulating disk to press the electrode ball into place with a tight fit, manufacturing and assembly are simplified, and costs can be greatly reduced.

[0011] Furthermore, multiple insulating disks are provided at intervals along the axial direction of the insulating rod.

[0012] Furthermore, two adjacent electrode posts are spaced apart circumferentially along the insulating disk.

[0013] This shortens the axial distance between two adjacent electrode posts, thereby reducing the size of the lightning protection device.

[0014] Furthermore, in the direction of connecting the upper fitting to the lower fitting, the plurality of electrode posts are arranged in a clockwise or counterclockwise direction.

[0015] This allows the orientation of the gap holes on two adjacent insulating disks to be misaligned.

[0016] Furthermore, the insulating disc is integrally molded from insulating material.

[0017] Furthermore, the insulating rod includes a core rod covered with ethylene propylene rubber.

[0018] Furthermore, the distance between the electrode ball and the adjacent electrode post or electrode ball is 1~2cm.

[0019] In summary, this utility model has the advantages of simple structure, convenient installation, operation and use in harsh environments, low maintenance cost, large current capacity, and ability to withstand direct lightning strikes. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Example 1.

[0021] Figure 2 This is a schematic diagram of the insulating disk.

[0022] Figure 3 This is a schematic diagram of the electrode ball and the gap hole.

[0023] Figure 4 This is a schematic diagram of the structure of Example 2. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the embodiments.

[0025] Example 1: As Figures 1-3 As shown, a multi-gap lightning protection device includes an insulating rod 1, which includes a core rod covered with ethylene propylene rubber. Upper connecting fittings 2 and lower connecting fittings 3 are respectively connected to both ends of the insulating rod 1. An insulating disk 4 is coaxially mounted on the insulating rod 1, and the insulating disk 4 is integrally molded from insulating material. Each side of the insulating disk 4 has a vertically arranged electrode post 5, both electrode posts 5 being close to the edge of the insulating disk 4, and the central angle between them being greater than 20°. An electric arc detector is embedded within the insulating disk 4. Electrode balls 6 are evenly distributed at large arc intervals between two electrode posts 5. Each electrode ball 6 has a gap hole 7 perpendicular to the line connecting the two adjacent electrode posts 5 or electrode balls 6. One end of the gap hole 7 penetrates the surface of the insulating disk 4. The upper connecting hardware 2 and the lower connecting hardware 3 each have electrode posts 5 facing the insulating disk 4. Adjacent electrode posts 5 are spaced apart from each other. The distance between the electrode balls 6 and adjacent electrode posts 5 or electrode balls 6 is 1~2cm.

[0026] The gap hole 7 is radially disposed on the outer circumference of the insulating disk 4; one side of the insulating disk 4 has a vertically disposed blind hole 8, which is located between two adjacent gap holes 7; the inner diameter of the blind hole 8 matches the diameter of the electrode ball 6, and the electrode ball 6 is tightly fitted and embedded in the blind hole 8. By using the blind hole on the insulating disk and employing a tight fit to press the electrode ball into place, manufacturing and assembly are simplified, and costs can be significantly reduced.

[0027] In the above structure, due to the gap between adjacent electrode posts and the spacing between the electrode balls and adjacent electrode balls and posts, when a lightning impulse overvoltage is applied to the surge arrester, it will break down the gap between the two electrode posts, conducting to the insulating disk. The multiple evenly distributed electrode balls between the two electrode posts on the insulating disk will also be broken down, generating an electric arc. The arc is ejected through the gap holes between the electrode balls and the electrode posts or between the electrode balls, causing the arc to lengthen and the arc resistance to increase. Under the combined effect of arc voltage drop and deionization, the power frequency arc is extinguished at the first zero crossing (within 10ms), completing one lightning strike protection. The above lightning protection device can operate in harsh environments, is not afraid of pollution, requires no maintenance, has a simple structure, small size, light weight, and is easy to install.

[0028] Example 2: The main difference from the example is that, as Figure 4 As shown, multiple insulating disks 4 are spaced apart along the axial direction of the insulating rod 1. Adjacent electrode posts 5 are spaced apart circumferentially along the insulating disk 4, and in the direction from the upper connecting hardware 2 to the lower connecting hardware 3, the multiple electrode posts 5 are arranged in a clockwise or counterclockwise direction. This shortens the axial distance between adjacent electrode posts, thereby reducing the size of the lightning protection device.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-gap lightning protection device, comprising an insulating rod (1), wherein an upper connecting fitting (2) and a lower connecting fitting (3) are respectively connected to both ends of the insulating rod (1), and an insulating disc (4) is coaxially mounted on the insulating rod (1), characterized in that, The insulating disk (4) has a vertically arranged electrode post (5) on each side. Both electrode posts (5) are close to the edge of the insulating disk (4), and the central angle between them is greater than 20°. Electrode balls (6) are embedded in the insulating disk (4). Multiple electrode balls (6) are evenly distributed along the major arc interval between the two electrode posts (5). Each electrode ball (6) has a gap hole (7) perpendicular to the line connecting the two adjacent electrode posts (5). One end of the gap hole (7) penetrates the surface of the insulating disk (4). The upper connecting hardware (2) and the lower connecting hardware (3) both have electrode posts (5) facing the insulating disk (4). Adjacent electrode posts (5) are spaced apart from each other.

2. The multi-gap lightning protection device as described in claim 1, characterized in that, The gap hole (7) is arranged radially on the outer circular surface of the insulating disk (4).

3. The multi-gap lightning protection device as described in claim 2, characterized in that, The insulating disk (4) has a vertically arranged blind hole (8) on one side, the blind hole (8) being located between two adjacent gap holes (7); the inner diameter of the blind hole (8) matches the diameter of the electrode ball (6), and the electrode ball (6) is tightly embedded in the blind hole (8).

4. The multi-gap lightning protection device as described in claim 1, characterized in that, The insulating disks (4) are arranged in multiple spaces along the axial direction of the insulating rod (1).

5. The multi-gap lightning protection device as described in claim 1, characterized in that, The two adjacent electrode posts (5) are arranged at circumferential intervals along the insulating disk (4).

6. The multi-gap lightning protection device as described in claim 5, characterized in that, In the direction of the upper connecting fitting (2) and the lower connecting fitting (3), a plurality of electrode posts (5) are arranged in a clockwise or counterclockwise direction.

7. The multi-gap lightning protection device as described in claim 1, characterized in that, The insulating disk (4) is made of insulating material in one piece.

8. The multi-gap lightning protection device as described in claim 1, characterized in that, The insulating rod (1) includes a core rod covered with ethylene propylene rubber.

9. The multi-gap lightning protection device as described in claim 1, characterized in that, The distance between the electrode ball (6) and the adjacent electrode post (5) or electrode ball (6) is 1~2cm.

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