Half closed double-recoil arc-extinguishing insulator

Abstract

The application discloses a semi-closed double-recoil arc-extinguishing insulator, which comprises an insulator body, an upper electrode and a lower electrode; the inside of the insulator body is a hollow structure, and a partition plate is longitudinally arranged at the middle position of the inside of the insulator body, so that the inside space of the insulator body is divided into two groups of recoil perfusion arc-extinguishing channels; one recoil arc-extinguishing assembly is fixedly installed at the upper end of the recoil perfusion arc-extinguishing channel on the left side, and the lower end is a recoil spout extending to the side of the insulator body; the upper end of the recoil perfusion arc-extinguishing channel on the right side is a recoil spout extending to the side of the insulator body, and the lower end is fixedly installed with a recoil arc-extinguishing assembly. The application can constrain and control the arc path, eliminate the harm of arc drift, has a wide range of use, can be installed once and used repeatedly for a long time, has low operation cost, high sensitivity and is favorable to the safe production of electric power.

Description

Technical Field

[0001] This invention pertains to lightning protection devices for overhead power transmission and distribution lines, and relates to a semi-enclosed double-backlash arc-extinguishing insulator. Background Technology

[0002] Insulators are special insulating components that play a crucial role in overhead transmission lines. In the past, insulators were primarily used on utility poles. Gradually, they evolved into disc-shaped insulators hung at one end of high-voltage power line towers to increase creepage distance; these are typically made of glass or ceramic. Insulators should not fail due to various electromechanical stresses caused by changes in environmental and electrical load conditions; otherwise, they will not function effectively and will impair the service life and operational life of the entire power line.

[0003] The main function of insulators is to provide electrical insulation and mechanical fixation, for which various electrical and mechanical performance requirements are specified. Regarding the development, manufacturing process, materials, testing methods, aging issues, mechanical properties, brittle fracture issues, umbrella group knotting, and high-altitude issues of composite insulators, aging problems seriously affect the lightning resistance level of transmission lines. In severe cases, it can cause insulator flashover, leading to single-phase short-circuit faults and tripping accidents. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a semi-enclosed double-backflush arc-extinguishing insulator. This device possesses better arc-extinguishing effectiveness and durability.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A semi-enclosed double backflush arc-extinguishing insulator includes an insulator body, an upper electrode, and a lower electrode, which are fixedly installed on a crossarm or overhead conductor via connecting hardware. The insulator body has a hollow internal structure, and a longitudinal partition is provided in the middle of the insulator body. The partition divides the internal space of the insulator body into two sets of backflush injection arc-extinguishing channels, and a wall electrode is provided on the partition. A backflush arc-extinguishing component is fixedly installed at the upper end of the left backflush injection arc-extinguishing channel, and a backflush nozzle extending vertically downward or to the side of the insulator body is located at the lower end. A backflush injection arc-extinguishing component is fixedly installed at the lower end of the right backflush injection arc-extinguishing channel, and a backflush arc-extinguishing component is fixedly installed at the lower end. The backflush arc-extinguishing component at the upper end of the insulator body is electrically connected to the upper electrode, and the backflush arc-extinguishing component at the lower end of the insulator body is electrically connected to the lower electrode.

[0006] The present invention further explains that the recoil arc extinguishing assembly mainly consists of a recoil tube and a lightning rod; the recoil tube is open at one end and the lightning rod is fixedly installed at the other end, making the recoil arc extinguishing assembly a semi-closed tube with a hollow interior, an open end, and a closed end; the lightning rod is electrically connected to the upper electrode or the lower electrode.

[0007] Both the electrodes and the lightning arrester are made of highly conductive metals or non-metals, which can guide the electric arc into the recoil injection arc extinguishing channel; the recoil tube is made of high-strength, high-pressure-resistant non-conductive metal material.

[0008] The present invention further illustrates that an arc-guiding ring is provided at the opening of the recoil pipe. The arc-guiding ring is made of a highly conductive metal or non-metal, and guides the electric arc to the recoil injection arc-extinguishing channel on the other side by cooperating with the wall electrode.

[0009] The present invention further illustrates that the outer surface of the insulator body is provided with a skirt. The skirt enhances the creepage distance and prevents arcing along the surface.

[0010] The present invention further explains that the wall electrode is an arc-guiding electrode sheet, a compression arc-extinguishing tube, or a recoil tube. The wall electrode effectively disperses the arc energy, making the arc easier to extinguish.

[0011] The present invention further illustrates that the opening of the backflush nozzle extending to the side of the insulator body is inclined downward.

[0012] Working principle of the invention: When this invention is installed on a transmission line, the electric arc generated when lightning strikes a tower or lightning conductor is drawn into the interior of the insulator string, preventing flashover on the outer surface of the insulator string. The electric arc can be drawn into the interior of the insulator string through the upper or lower electrode. Because the backfill arc-extinguishing channel is very narrow, a large lightning arc will transform into a slender arc upon entering the backfill arc-extinguishing channel, filling the entire channel. The backfill arc-extinguishing channel exerts a force on the arc, eventually creating a compression explosion effect, blocking the passage of subsequent arcs and severing the arc. The arc that has entered the backfill arc-extinguishing channel is then drawn in by the arc-conducting ring or lightning arrester. Entering the recoil tube within the recoil extinguishing assembly, when the arc enters from the arc guide ring, it is constrained by the tube wall due to the elastic deformation of the plasma. Upon entering the tube's initial stage, the increased density, velocity, and temperature lead to increased pressure within the tube, ultimately resulting in a pressure burst effect. The arc impacts the lightning arrester at the bottom of the recoil tube, where it experiences a reverse force, causing most of the arc's trajectory to change 180°. The rebounding arc, with even greater velocity, density, and pressure, experiences a cavity effect at the inlet, causing the arc at the recoil tube's port to be truncated and extinguished. Furthermore, if an arc remains after one recoil extinguishing cycle, the combined action of the arc guide ring and wall electrodes draws the remaining unextinguished arc into the recoil extinguishing assembly within the semi-enclosed recoil injection extinguishing channel on the other side, where it undergoes another recoil extinguishing action to completely extinguish the arc.

[0013] The advantages and beneficial effects of this invention are as follows: 1. This invention can constrain and control the arc path, introduce an arc extinguishing channel into the arc, eliminate the hazards of arc drift, and improve safety performance.

[0014] 2. This invention can directly replace insulator strings on transmission lines, not only retaining the original insulation function but also providing lightning protection and arc extinguishing capabilities. It has a wide range of applications and is unaffected by conductor layout, tower type, or polarity effects. 3. This invention effectively prevents flashover problems on the outer surface of insulator strings, reduces the tripping rate of power equipment due to lightning strikes, protects power facilities, improves the reliability of the power grid, and is conducive to safe power production. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall internal structure of an embodiment of the present invention.

[0016] Figure 2 This is a schematic diagram of the backlash arc extinguishing component of the present invention.

[0017] Figure 3 This is a schematic diagram of the installation of the present invention.

[0018] Figure 4This is a schematic diagram of the overall internal structure of another embodiment of the present invention.

[0019] Figure 5 This is a schematic diagram of the overall internal structure of another embodiment of the present invention.

[0020] Figure 6 This is a schematic diagram of the overall internal structure of another embodiment of the present invention.

[0021] The serial numbers and corresponding names in the diagram are as follows: 2-Upper electrode, 3-Lower electrode, 4-Insulator body, 5-Recoil arc extinguishing assembly, 6-Recoil nozzle, 7-Wall electrode, 8-Partition plate, 9-Recoil injection arc extinguishing channel, 10-Skirt, 11-Arc guide ring, 12-Recoil pipe, 13-Lightning arrester. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1: like Figure 1 , Figure 3 As shown, a semi-enclosed double backflush arc-extinguishing insulator includes an insulator body 4, an upper electrode 2, and a lower electrode 3, which are fixedly installed on a crossarm or overhead conductor via connecting fittings. The insulator body 4 has a hollow internal structure, and a partition 8 is longitudinally provided in the middle of the insulator body. The partition 8 divides the internal space of the insulator body 4 into two sets of backflush injection arc-extinguishing channels 9. A wall electrode 7 is provided on the partition 8. A backflush arc-extinguishing component is fixedly installed at the upper end of the backflush injection arc-extinguishing channel on the left side, and a backflush nozzle extending towards the side of the insulator body at the lower end. A backflush injection arc-extinguishing component is fixedly installed at the lower end of the backflush injection arc-extinguishing channel on the right side. The backflush arc-extinguishing component at the upper end of the insulator body is electrically connected to the upper electrode 2, and the backflush arc-extinguishing component at the lower end of the insulator body is electrically connected to the lower electrode 3.

[0023] like Figure 2 As shown, the recoil arc-extinguishing assembly 5 mainly consists of a recoil tube 12 and a lightning rod 13. One end of the recoil tube 12 is open, and the lightning rod 13 is fixedly installed at the other end, making the recoil arc-extinguishing assembly 5 a semi-closed tube with a hollow interior, one open end, and the other closed end. The lightning rod 13 is electrically connected to the upper or lower electrode. An arc-guiding ring 11 is provided at the opening of the recoil tube 12. A skirt 10 is provided on the outer surface of the insulator body 4. The wall electrode 7 uses an arc-guiding electrode sheet.

[0024] Example 2: like Figure 4As shown, this embodiment is basically the same in structure and principle as Embodiment 1, except that the wall electrode 7 is a compression arc-extinguishing tube. The compression arc-extinguishing tube is a ceramic tube, and an arc-guiding metal ball is placed in the middle of the tube.

[0025] Example 3: like Figure 5 As shown, this embodiment is basically the same in structure and principle as embodiment 1, except that the wall electrode 7 is a backflush tube. The backflush tube is a semi-closed tube with one end open and the other end connected to the lightning electrode.

[0026] Example 4: like Figure 6 As shown, this embodiment is basically the same in structure and principle as embodiment 3, except that the opening of the backflush nozzle extending to the side of the insulator body is inclined downward.

[0027] Example 5: This embodiment is basically the same as embodiment 1 in structure and principle. The difference is that a backwash arc extinguishing component is fixedly installed at the upper end of the backwash injection arc extinguishing channel on the left side, and a backwash nozzle is set at the lower end that extends vertically downward.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A semi-enclosed double-back-jamming arc-extinguishing insulator, comprising an insulator body (4), an upper electrode (2), and a lower electrode (3) fixedly mounted on a crossarm or overhead conductor via connecting fittings; characterized in that: The insulator body (4) has a hollow structure inside, and a partition (8) is provided longitudinally in the middle of the insulator body. The partition (8) divides the internal space of the insulator body (4) into two backflush injection arc extinguishing channels (9). A wall electrode (7) is provided on the partition (8). A backflush arc extinguishing component is fixedly installed at the upper end of the backflush injection arc extinguishing channel on the left side, and a backflush nozzle is provided at the lower end, extending vertically downward or to the side of the insulator body. A backflush injection arc extinguishing component is fixedly installed at the lower end of the backflush injection arc extinguishing channel on the right side, extending to the side of the insulator body. The backflush arc extinguishing component at the upper end of the insulator body is electrically connected to the upper electrode (2), and the backflush arc extinguishing component at the lower end of the insulator body is electrically connected to the lower electrode (3).

2. The semi-enclosed double-back-jamming insulator according to claim 1, characterized in that: The recoil arc extinguishing assembly (5) is mainly composed of a recoil tube (12) and a lightning rod (13); the recoil tube (12) is open at one end and the lightning rod (13) is fixedly installed at the other end, so that the recoil arc extinguishing assembly (5) is a semi-closed tube with a hollow interior, an open end, and a closed end; the lightning rod (13) is electrically connected to the upper electrode or the lower electrode.

3. The semi-enclosed double-back-jamming insulator according to claim 2, characterized in that: The backflush tube (12) is provided with an arc guide ring (11) at its opening.

4. The semi-enclosed double-back-jamming insulator according to claim 1, characterized in that: The outer surface of the insulator body (4) is provided with a skirt (10).

5. The semi-enclosed double-back-jamming insulator according to claim 1, characterized in that: The wall electrode (7) is an arc-conducting electrode sheet, a compression arc-extinguishing tube, or a backflush tube.

6. The semi-enclosed double-back-jamming insulator according to claim 1, characterized in that: The opening of the backflush nozzle, which extends to the side of the insulator body, is inclined downwards.

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