Semi-enclosed double-jet airflow arc extinguishing insulator

Abstract

The present invention discloses a semi-enclosed double-jet airflow arc-extinguishing insulator, comprising an insulator body, an upper electrode, and a lower electrode. The insulator body is hollow, and a partition is longitudinally provided in the middle of the insulator body, dividing the internal space of the insulator body into two sets of jet airflow channels. A jet airflow assembly is fixedly installed at the upper end of the left jet airflow channel, and an airflow nozzle is provided at the lower end to extend toward the side of the insulator body. The right jet airflow channel has an airflow nozzle extended toward the side of the insulator body at the upper end, and a jet airflow assembly is fixedly installed at the lower end. The present invention can constrain and control the arc path, eliminating the hazards of arc drift. It has a wide range of applications, can be installed once and reused for a long time, has low operating costs, is highly sensitive, and is conducive to safe power production.

Description

Technical Field

[0001] The invention belongs to a lightning protection device for overhead power transmission and distribution lines, and relates to a semi-enclosed double-jet airflow arc-extinguishing insulator. Background Art

[0002] Insulators are specialized insulating components that play a vital role in overhead transmission lines. Initially used on utility poles, they evolved into high-voltage transmission towers, where multiple disc-shaped insulators are hung from one end to increase creepage distance. These insulators are typically made of glass or ceramic. Insulators should not fail due to various electromechanical stresses caused by changing environmental and electrical load conditions. Otherwise, they will not be able to effectively function, compromising the service life and operational life of the entire line.

[0003] The primary functions of insulators are electrical insulation and mechanical fixation, necessitating various electrical and mechanical performance requirements. These requirements address the development, processing, materials, testing methods, aging, mechanical properties, brittle fracture, clustering, and high-altitude issues of composite insulators. Aging can severely impact the lightning resistance of transmission lines, and in severe cases, can cause insulator flashovers, single-phase short-circuits, and tripping accidents. Summary of the Invention

[0004] The present invention aims to address the deficiencies in the prior art and provide a semi-enclosed double-jet airflow arc-extinguishing insulator. The device has good effectiveness and durability.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A semi-enclosed double-jet airflow arc-extinguishing insulator comprises an insulator body, an upper electrode and a lower electrode fixedly mounted on a crossarm or an overhead conductor via connecting hardware; the interior of the insulator body is a hollow structure, and a partition is longitudinally provided at the middle position inside the insulator body, the partition dividing the internal space of the insulator body into two groups of jet airflow channels, and the partition is provided with a wall electrode; a jet airflow assembly is fixedly mounted at the upper end of the left jet airflow channel, and an airflow nozzle extending vertically downward or extending toward the side of the insulator body is provided at the lower end; the upper end of the right jet airflow channel is an airflow nozzle extending toward the side of the insulator body, and a jet airflow assembly is fixedly mounted at the lower end; the jet airflow assembly at the upper end of the insulator body is electrically connected to the upper electrode, and the jet airflow assembly at the lower end of the insulator body is electrically connected to the lower electrode.

[0007] The present invention further describes that the jet air flow assembly is mainly composed of a jet tube and a gas generator; the jet tube is embedded in the inner wall of the end of the jet air flow channel, and one end is fixedly connected to the gas generator, and the other end is open and connected to the jet air flow channel; the gas generator is fixed at the end of the jet air flow channel, so that the internal space of the insulator body forms two groups of semi-closed structures, and the arc-striking electrode is arranged on the gas generator.

[0008] The arc-striking electrode is constructed of a highly conductive metal or non-metallic material capable of guiding the arc into the jet flow channel; the jet tube is constructed of a high-strength, high-pressure-resistant non-conductive metal material; and the gas generator is internally provided with an arc-extinguishing gas pellet triggered by an induced current. The gas generator in the present invention can be a gas generator from the solid-phase arc-extinguishing lightning protection device series previously patented by the inventor, or a gas generator currently available on the market for lightning protection and arc extinguishing on power transmission lines.

[0009] The present invention further describes that an arc guide ring is provided at the opening of the jet tube. The arc guide ring is made of a highly conductive metal or non-metal and cooperates with the wall electrode to guide the arc to the jet air flow channel on the other side.

[0010] The present invention further states that the outer surface of the insulator body is provided with a skirt, which can increase the creepage distance and prevent arc discharge along the surface.

[0011] The present invention further states that the wall electrodes are arc-guiding electrode sheets or compressed arc-extinguishing tubes or recoil tubes. Providing the wall electrodes can effectively disperse the arc energy and make the arc easier to extinguish.

[0012] The present invention further states that the opening of the airflow nozzle extending from the side of the insulator body is tilted downward. The downward-opening airflow nozzle can effectively prevent rainwater or dust from entering the jet airflow channel.

[0013] Working principle of the present invention:

[0014] When the present invention is installed on a transmission line, the arc generated by lightning striking a tower or lightning conductor is introduced into the interior of the insulator string, preventing flashover on the outer surface of the insulator string; the arc can be drawn into the interior of the insulator string through the upper electrode or the lower electrode, and the current flowing in the upper / lower electrode triggers the induction power supply of the gas generator to generate an induced current, which in turn triggers the arc extinguishing gas pellet to operate, generating high-speed high-pressure gas to act on the arc. Most of the arc is destroyed by the operation of the jet gas generator. The remaining arc follows the wall electrode into the jet gas channel on the other side, wherein an arc guide ring is provided at the jet tube hole of the jet gas generating assembly. Under the action of the arc guide ring and the wall electrode, the remaining arc enters the jet gas assembly in the jet gas channel on the other side, and the flowing arc current triggers the induction power supply of the gas generator to generate an induced current, which in turn triggers the arc extinguishing gas pellet to operate, generating high-speed high-pressure gas to act on the remaining arc, completely extinguishing the arc.

[0015] The advantages and beneficial effects of the present invention are as follows:

[0016] 1. The present invention can constrain and control the arc path, the arc can be introduced into the arc extinguishing channel, eliminating the hazards of arc drift and improving safety performance.

[0017] 2. The present invention can directly replace the insulator string on the transmission line. It not only has the original insulation function, but also has the lightning protection and arc extinguishing function. It has a wide range of applications and is not affected by the conductor layout, tower type, and polarity effect.

[0018] 3. The present invention effectively prevents flashover problems of lightning protection devices, reduces the lightning trip rate of power equipment, protects power facilities, improves power grid reliability, and is beneficial to safe power production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall internal structure of an embodiment of the present invention.

[0020] Figure 2 Schematic diagram of the jet airflow assembly of the present invention.

[0021] Figure 3 It is an installation diagram of the present invention.

[0022] Figure 4 This is a schematic diagram of the overall internal structure of another embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the overall internal structure of yet another embodiment of the present invention.

[0024] Figure 6 Schematic diagram of the overall internal structure of another embodiment of the present invention.

[0025] Serial numbers and corresponding names in the figure:

[0026] 2-upper electrode, 3-lower electrode, 4-insulator body, 5-jet gas flow assembly, 6-gas nozzle, 7-wall electrode, 8-partition, 9-jet gas flow channel, 10-skirt, 11-arc guide ring, 12-jet tube, 13-gas generator. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0028] Example 1:

[0029] like Figure 1 、 Figure 3 As shown, a semi-enclosed double-jet airflow arc-extinguishing insulator includes an insulator body 4, an upper electrode 2 and a lower electrode 3 fixedly mounted on a crossarm or an overhead conductor by connecting hardware; the interior of the insulator body 4 is a hollow structure, and a partition 8 is longitudinally provided at the middle position inside the insulator body, and the partition 8 divides the internal space of the insulator body 4 into two groups of jet airflow channels 9, and the partition 8 is provided with a wall electrode 7; a jet airflow assembly is fixedly mounted at the upper end of the jet airflow channel on the left, and an airflow nozzle is extended to the side of the insulator body at the lower end; the upper end of the jet airflow channel on the right is an airflow nozzle extended to the side of the insulator body, and a jet airflow assembly is fixedly mounted at the lower end; the jet airflow assembly at the upper end of the insulator body is electrically connected to the upper electrode 2, and the jet airflow assembly at the lower end of the insulator body is electrically connected to the lower electrode 3.

[0030] like Figure 2 As shown, the jet flow assembly 5 is mainly composed of a jet tube 12 and a gas generator 13. The jet tube 12 is embedded in the inner wall of the end of the jet flow channel 9, with one end fixedly connected to the gas generator 13 and the other end open and connected to the jet flow channel 9. The gas generator 13 is fixedly installed at the end of the jet flow channel 9, so that the internal space of the insulator body 4 forms two sets of semi-enclosed structures. The arc-striking electrode 14 is installed on the gas generator 13. An arc-guiding ring 11 is provided at the opening of the jet tube 12. The outer surface of the insulator body 4 is provided with a skirt 10. The wall electrode 7 adopts an arc-guiding electrode sheet.

[0031] Example 2:

[0032] like Figure 4 As shown, this embodiment is basically the same in structure and principle as the first embodiment, except that the wall electrode 7 uses a compression arc extinguishing tube. The compression arc extinguishing tube is a ceramic tube with an arc guide metal ball placed in the middle of the tube.

[0033] Example 3:

[0034] like Figure 5 As shown, this embodiment is basically the same in structure and principle as the first embodiment, except that the wall electrode 7 adopts a recoil tube. The recoil tube is a semi-enclosed tube with one end open and the other end connected to the lightning electrode.

[0035] Example 4:

[0036] like Figure 6 As shown, this embodiment is basically the same in structure and principle as the third embodiment, except that the opening of the airflow nozzle extending toward the side of the insulator body is tilted downward.

[0037] Example 5:

[0038] This embodiment is basically the same as the embodiment 3 in structure and principle, except that a jet airflow assembly is fixedly installed at the upper end of the left jet airflow channel, and the lower end is an airflow nozzle extending vertically downward.

[0039] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

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

2. The semi-enclosed double-jet airflow arc-extinguishing insulator according to claim 1, characterized in that: The jet air flow assembly (5) is mainly composed of a jet tube (12) and a gas generator (13); the jet tube (12) is embedded in the inner wall of the end of the jet air flow channel (9), and one end is fixedly connected to the gas generator (13), and the other end is open and communicated with the jet air flow channel (9); the gas generator (13) is fixedly arranged at the end of the jet air flow channel (9), so that the internal space of the insulator body (4) forms two groups of semi-enclosed structures.

3. The semi-enclosed double-jet airflow arc-extinguishing insulator according to claim 2, characterized in that: An arc guide ring (11) is provided at the opening of the injection tube (12).

4. The semi-enclosed double-jet airflow arc-extinguishing 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-jet airflow arc-extinguishing insulator according to claim 1, characterized in that: The wall electrode (7) adopts an arc-guiding electrode sheet or a compressed arc-extinguishing tube or a recoil tube.

6. The semi-enclosed double-jet airflow arc-extinguishing insulator according to claim 1, characterized in that: The opening of the airflow nozzle extending toward the side surface of the insulator body is inclined downward.

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