A time-delay coupled mixed airflow arc extinguishing lightning protection device

Abstract

The present invention provides a time-delayed coupled mixed airflow arc extinguishing lightning protection device, comprising two lightning protection insulator bodies, a grading ring, a skirt, a low-voltage grounding electrode, and a high-voltage electrode; one end of the two lightning protection insulator bodies is connected via a low-voltage grounding electrode, and the other end is connected via a high-voltage electrode; both ends of each lightning protection insulator body are provided with a grading ring, and each lightning protection insulator body is provided with a plurality of skirts; an arc extinguishing path is provided inside each lightning protection insulator body; the arc extinguishing path is mainly composed of a plurality of longitudinal airflow arc extinguishing bodies and a plurality of transverse airflow arc extinguishing pipes; both ends of the arc extinguishing path are longitudinal airflow arc extinguishing bodies, and a transverse airflow arc extinguishing pipe is provided between two adjacent longitudinal airflow arc extinguishing bodies. The present invention improves the arc extinguishing effect and insulation effect of the parallel lightning protection device by combining an insulating string with an arc extinguishing unit, and at the same time utilizes the transverse and longitudinal arc extinguishing method in the arc extinguishing chamber to lengthen the arc extinguishing path, shorten the arc extinguishing time, and thus improve the arc extinguishing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning protection devices for power transmission lines, and in particular to a delayed-coupled mixed airflow arc-extinguishing lightning protection device. Background Art

[0002] Lightning protection for transmission lines has always been a key component of power sector operations, and lightning faults remain a significant factor impacting power grid safety. Lightning strikes on transmission lines cause impulse flashover, which in turn generates significant power frequency freewheeling current, damaging insulator strings and hardware, leading to line accidents. Power sectors typically install lightning arresters (SPDs) on transmission lines to provide protection.

[0003] An electric arc is a high-temperature, highly conductive, free gas. Extinguishing an arc is often referred to as arc extinguishing. There are several methods for extinguishing an arc, most of which use a gas or liquid to perform the primary arc extinguishing task.

[0004] A lightning arrester is an electrical device that can release lightning or release the overvoltage energy of the power system operation to protect electrical equipment from instantaneous overvoltage hazards, and can also cut off the continuous current to avoid causing a system ground short circuit.

[0005] At present, the existing lightning arrester is generally composed of an insulating string and an arc extinguishing unit connected in parallel, wherein the insulating string only has an insulating function and does not have an arc extinguishing function, and the arc extinguishing effect is not ideal if the arc is extinguished only by the arc extinguishing unit. Summary of the Invention

[0006] In view of the above content, it is necessary to provide a delayed-coupled mixed airflow arc extinguishing lightning protection device, which improves the arc extinguishing effect and insulation effect of the parallel lightning protection device by combining the insulating string with the arc extinguishing unit. At the same time, it uses the arc extinguishing method of horizontal and vertical blowing in the arc extinguishing chamber to lengthen the arc extinguishing path and shorten the arc extinguishing time, thereby improving the arc extinguishing effect and effectively suppressing the reignition of the arc.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A time-delay coupled mixed airflow arc extinguishing lightning protection device comprises two lightning protection insulator bodies, a grading ring, a skirt, a low-voltage grounding electrode and a high-voltage electrode;

[0009] One end of the two lightning protection insulator bodies in the length direction is connected through a low-voltage grounding electrode, and the other end is connected through the high-voltage electrode; both ends of each lightning protection insulator body in the length direction are provided with a grading ring, and each lightning protection insulator body is provided with a plurality of skirts at intervals along its length direction, and the skirts are located between the grading rings at both ends of the lightning protection insulator body;

[0010] An arc extinguishing path is provided inside each lightning protection insulator body, and the arc extinguishing path extends from one end to the other end in the length direction of the lightning protection insulator body; the arc extinguishing path is mainly composed of a number of longitudinal airflow arc extinguishing bodies and a number of transverse airflow arc extinguishing pipes; both ends of the arc extinguishing path are longitudinal airflow arc extinguishing bodies, and a transverse airflow arc extinguishing pipe is provided between two adjacent longitudinal airflow arc extinguishing bodies; each longitudinal airflow arc extinguishing body is mainly composed of a number of longitudinal airflow arc extinguishing pipes connected to form a regular hexagonal structure, wherein the plane where the hexagon is located is parallel to the length direction of the lightning protection insulator body; the wall of each longitudinal airflow arc extinguishing pipe is made of insulating material, one end of which in the length direction is provided with an anode, and the other end is provided with a cathode and An electromagnetic valve structure, wherein the interior of the longitudinal airflow arc-extinguishing duct is connected to the outside world through the electromagnetic valve structure, a trigger electrode and a plurality of TNT arc-extinguishing energy groups are provided in the longitudinal airflow arc-extinguishing duct, the trigger electrode is located between the anode and the cathode, and all the TNT arc-extinguishing energy groups are located between the anode and the trigger electrode, and are sequentially spaced along the tube length direction of the longitudinal airflow arc-extinguishing duct; the tube length direction of each transverse airflow arc-extinguishing duct is parallel to the length direction of the lightning protection insulator body, a plurality of ball electrodes are provided in the transverse airflow arc-extinguishing duct, and all the ball electrodes are sequentially spaced along the tube length direction of the transverse airflow arc-extinguishing duct, and a transverse blow fracture is opened on the tube wall between two adjacent ball electrodes of the transverse airflow arc-extinguishing duct;

[0011] In the longitudinal airflow arc extinguishing body, two longitudinal airflow arc extinguishing pipes form a pair of longitudinal airflow arc extinguishing pipes, and the anodes of the two longitudinal airflow arc extinguishing pipes in each pair of longitudinal airflow arc extinguishing pipes are sealed and connected by connecting electrodes. The solenoid valve structures of the two longitudinal airflow arc extinguishing pipes close to each other in the two adjacent pairs of longitudinal airflow arc extinguishing pipes are opposite, and the connection between the two is not a sealed connection;

[0012] The spherical electrodes at the head and tail ends of the transverse airflow arc extinguishing pipe between two adjacent longitudinal airflow arc extinguishing bodies are respectively connected to the cathode of a longitudinal airflow arc extinguishing pipe on the two longitudinal airflow arc extinguishing bodies; the longitudinal airflow arc extinguishing body close to the low-voltage grounding electrode is electrically connected to the low-voltage grounding electrode, and the longitudinal airflow arc extinguishing body close to the high-voltage electrode is electrically connected to the high-voltage electrode.

[0013] Preferably, the skirt is divided into a first skirt and a second skirt, the outer contour size of the first skirt is larger than the outer contour size of the second skirt, and a second skirt is arranged between two adjacent first skirts.

[0014] Preferably, a longitudinal airflow arc extinguishing body is arranged between two adjacent skirts, a longitudinal airflow arc extinguishing body is arranged between the skirt at the head end of the lightning protection insulator body and the low-voltage grounding electrode at that end, and a longitudinal airflow arc extinguishing body is arranged between the skirt at the tail end of the lightning protection insulator body and the high-voltage electrode at that end.

[0015] Preferably, the arc extinguishing medium inside the longitudinal airflow arc extinguishing duct is C4-PFN-CO2 or CF3I / CO2.

[0016] Preferably, all the cross-blowing fractures on the cross-blowing arc-extinguishing duct are located on the same side of the cross-blowing arc-extinguishing duct.

[0017] Preferably, the connecting electrode is a trapezoidal electrode.

[0018] Preferably, the solenoid valve structure includes a current transformer, a relay and a solenoid valve, the primary side connector of the current transformer is connected to the anode and cathode respectively, the secondary side connector of the current transformer is connected to the relay, the relay is connected to the solenoid valve, and the opening and closing of the solenoid valve is controlled by the relay.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The lightning protection device designed in the present invention adopts a parallel structure, in which two lightning protection insulator bodies, both of which have arc extinguishing paths, are connected in parallel. Compared with the traditional parallel connection of an insulator without an arc extinguishing structure and a lightning protection component with an arc extinguishing structure, the present invention not only improves the overall insulation strength, but also allows the insulator to increase the arc extinguishing function, thereby improving the overall arc extinguishing effect.

[0021] 2. The present invention sets up an arc extinguishing path arranged in a stepped circular manner inside the main body of the lightning protection insulator. The arc extinguishing path has a longitudinal airflow arc extinguishing main body and a transverse airflow arc extinguishing duct, which can segment the arc to form multiple transverse and longitudinal blowing breakpoints, effectively suppressing the reignition of the arc.

[0022] 3. The longitudinal airflow arc extinguishing body of the present invention is formed into a regular hexagonal structure by six longitudinal airflow arc extinguishing pipes. Three electrodes, namely, an anode, a cathode and a trigger electrode, are provided on each longitudinal airflow arc extinguishing pipe. A plurality of TNT arc extinguishing energy groups are arranged at intervals inside the pipe. The plurality of TNT arc extinguishing energy groups are located between the anode and the trigger electrode. When the impact arc enters the longitudinal airflow arc extinguishing pipe, the impact arc reacts first between the anode and the trigger electrode, and then between the anode and the cathode. That is, the path of the impact arc is from the trigger electrode to the anode, and then from the anode to the cathode. Compared with the existing path from the anode to the cathode, this path has an additional trigger electrode. The distance from the trigger electrode to the anode, therefore, the longitudinal airflow arc extinguishing duct of the present invention can lengthen the arc extinguishing path, so that the arc extinguishing effect is better; secondly, the impact arc triggers the TNT arc extinguishing energy group from the trigger electrode side to the anode side in turn, causing the TNT arc extinguishing energy group to explode, thereby forming a detonation airflow, and the detonation airflow and the airflow in the arc extinguishing duct that self-expands due to instantaneous high temperature are coupled to form a mixed arc extinguishing airflow, which enhances the overpressure value and overpressure duration of the arc extinguishing duct, and thus effectively suppresses the reignition of the arc. In other words, the arc extinguishing method of the present invention adopts a delayed coupled mixed airflow arc extinguishing method, which can better suppress large-capacity, high-energy industrial frequency arcs.

[0023] 4. The present invention sets a solenoid valve structure at the cathode end of the longitudinal airflow arc extinguishing pipe. The solenoid valve structure can be opened at the moment of impact arc generation, thereby transforming the arc extinguishing pipe from a closed type to a semi-closed chamber, which is conducive to the ejection of strong airflow. The ejection of strong airflow can clean the dirt on the surface of the lightning protection device, protect the insulation performance of the insulator string, and effectively prevent arc surface flashover.

[0024] 5. The lightning protection device designed by the present invention has a simple structure, reasonable design, strong arc extinguishing ability, and stable and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 Schematic diagram of the structure of the arc extinguishing path of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the longitudinal airflow arc extinguishing duct of the present invention.

[0028] Description of main component symbols

[0029] In the figure: 1-lightning protection insulator body; 2-voltage grading ring; 3-longitudinal airflow arc extinguishing pipe; 4-transverse airflow arc extinguishing pipe; 5-low-voltage grounding electrode; 6-high-voltage electrode; 7-arc extinguishing path; 8-transverse blowing fracture; 9-ball electrode; 10-connecting electrode; 11-first skirt; 12-second skirt; 13-solenoid valve structure; 14-anode; 15-cathode; 16-trigger electrode; 17-TNT arc extinguishing energy group.

[0030] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0031] See also Figures 1 to 3 In a preferred embodiment of the present invention, a delayed coupled mixed airflow arc extinguishing lightning protection device includes two lightning protection insulator bodies 1, a grading ring 2, a skirt, a low-voltage grounding electrode 5 and a high-voltage electrode 6.

[0032] One end of the two lightning insulator bodies 1 in the length direction is connected by a low-voltage grounding electrode 5, and the other end is connected by the high-voltage electrode 6. The arc is guided into the interior of the lightning insulator body 1 by the low-voltage grounding electrode 5 and the high-voltage electrode 6, that is, in the present invention, the arc-starting electrodes are the low-voltage grounding electrode 5 and the high-voltage electrode 6. Each lightning insulator body 1 is provided with a grading ring 2 at both ends in the length direction. The grading ring 2 connects the device to the upper and lower mounting hardware of the arc arrester. In this embodiment, it is preferred that the overall shape of the grading ring 2 is uniform and resistant to arcs. Each lightning insulator body 1 is provided with a plurality of skirts at intervals along its length direction. The skirts are located between the grading rings 2 at both ends of the lightning insulator body 1. In this embodiment, the skirts are divided into a first skirt 11 and a second skirt 12. The outer contour size of the first skirt 11 is larger than the outer contour size of the second skirt 12. A second skirt 12 is provided between two adjacent first skirts 11.

[0033] Each lightning insulator body 1 is internally provided with an arc-extinguishing path 7, extending from one end to the other along the length of the lightning insulator body 1. This arc-extinguishing path 7 is primarily composed of a plurality of longitudinal airflow arc-extinguishing bodies and a plurality of transverse airflow arc-extinguishing ducts 4. Both ends of the arc-extinguishing path 7 are longitudinal airflow arc-extinguishing bodies, with a transverse airflow arc-extinguishing duct 4 disposed between adjacent longitudinal airflow arc-extinguishing bodies. Each longitudinal airflow arc-extinguishing body is primarily composed of a plurality of longitudinal airflow arc-extinguishing ducts 3 connected to form a regular hexagonal structure, wherein the plane of the hexagon is parallel to the length of the lightning insulator body 1. The tube wall of each longitudinal airflow arc extinguishing duct 3 is made of insulating material, and an anode 14 is provided at one end in the length direction, and a cathode 15 and an electromagnetic valve structure 13 are provided at the other end. The interior of the longitudinal airflow arc extinguishing duct 3 is connected to the outside world through the electromagnetic valve structure 13. A trigger electrode 16 and a plurality of TNT arc extinguishing energy groups 17 are provided in the longitudinal airflow arc extinguishing duct 3. The trigger electrode 16 is located between the anode 14 and the cathode 15. All the TNT arc extinguishing energy groups 17 are located between the anode 14 and the trigger electrode 16, and are arranged in sequence along the tube length direction of the longitudinal airflow arc extinguishing duct 3; the tube length direction of each transverse airflow arc extinguishing duct 4 is parallel to the length direction of the lightning protection insulator body 1, and a plurality of spherical electrodes 9 are provided in the transverse airflow arc extinguishing duct 4. All the spherical electrodes 9 are spaced in sequence along the tube length direction of the transverse airflow arc extinguishing duct 4, and a transverse blown fracture 8 is opened on the tube wall between two adjacent spherical electrodes 9.

[0034] In the longitudinal airflow arc-extinguishing body, two longitudinal airflow arc-extinguishing pipes 3 form a pair of longitudinal airflow arc-extinguishing pipes, and the anodes 14 of the two longitudinal airflow arc-extinguishing pipes 3 in each pair of longitudinal airflow arc-extinguishing pipes are sealed and connected through the connecting electrode 10. The solenoid valve structures 13 of the two longitudinal airflow arc-extinguishing pipes 3 close to each other in the two adjacent pairs of longitudinal airflow arc-extinguishing pipes are opposite, and the connection between the two is not a sealed connection;

[0035] The spherical electrodes 9 at the head and tail ends of the transverse airflow arc extinguishing pipe 4 between two adjacent longitudinal airflow arc extinguishing bodies are respectively connected to the cathode 15 of a longitudinal airflow arc extinguishing pipe 3 on the two longitudinal airflow arc extinguishing bodies; the longitudinal airflow arc extinguishing body close to the low-voltage grounding electrode 5 is electrically connected to the low-voltage grounding electrode 5, specifically, the low-voltage grounding electrode 5 is connected to the cathode 15 on a longitudinal airflow arc extinguishing pipe 3 in the longitudinal airflow arc extinguishing body, and the longitudinal airflow arc extinguishing body close to the high-voltage electrode 6 is electrically connected to the high-voltage electrode 6, specifically, the high-voltage electrode 6 is connected to the anode 14 on a longitudinal airflow arc extinguishing pipe 3 in the longitudinal airflow arc extinguishing body.

[0036] From the above, it can be seen that the arc extinguishing path 7 of the present invention is a method of alternating longitudinal and transverse blowing, which is arranged in a stepped cycle, and can segment the arc to form multiple transverse and longitudinal blowing breakpoints, thereby effectively suppressing the arc reignition and improving the arc extinguishing effect of the device. Among them, the longitudinal blowing is realized by a regular hexagonal longitudinal blowing airflow arc extinguishing body formed by six longitudinal blowing airflow arc extinguishing pipes 3, and the transverse blowing is realized by the transverse blowing airflow arc extinguishing pipe 4.

[0037] In the longitudinal airflow arc extinguishing body, each longitudinal airflow arc extinguishing pipe 3 is provided with multiple TNT arc extinguishing energy groups 17 and three electrodes - anode 14, cathode 15 and trigger electrode 16. The multiple TNT arc extinguishing energy groups 17 are located between the anode 14 and the trigger electrode 16. When the impact arc enters the longitudinal airflow arc extinguishing pipe 3 through the arc striking electrode, the impact arc is preferentially generated between the anode 14 and the trigger electrode 16, and then between the anode 14 and the cathode 15. In this way, the path of the impact arc has an additional distance from the trigger electrode 16 to the anode 14 compared to the existing arc extinguishing path 7, so that the arc extinguishing path 7 is extended. In addition, the multiple TNT arc extinguishing energy groups 17 are arranged between the trigger electrode 16 and the anode 14, so that the impact arc detonates the TNT arc extinguishing energy groups 17 in sequence from the trigger electrode 16 side to the anode 14 side. The detonation of multiple TNT arc extinguishing energy groups 17 increases the arc extinguishing time, which achieves the purpose of delay, thereby lengthening the arc extinguishing path 7 and increasing the arc extinguishing time, thereby achieving better arc extinguishing effect. Secondly, the detonation airflow formed by the impact arc detonating the TNT arc extinguishing energy group 17 can be coupled with the airflow formed by the self-expansion of the gas in the arc extinguishing duct due to the high temperature in the arc extinguishing duct (generated by the trigger electrode 16 and the impact arc energy) to form a mixed arc extinguishing airflow. The mixed arc extinguishing airflow generates a superposition effect of high-energy compression wave and explosion shock wave during the movement, which enhances the coupled shock wave overpressure and prolongs the duration of the overpressure effect, thereby achieving the goal of suppressing the reignition of the power frequency arc. Furthermore, in the longitudinal airflow arc extinguishing body, the two adjacent longitudinal airflow arc extinguishing ducts 3 are connected by a connecting electrode 10. The connecting electrode 10 can seal the longitudinal airflow arc extinguishing duct 3 to facilitate the formation of overpressure in the duct. Preferably, the connecting electrode 10 is a trapezoidal electrode to match the structure of the two longitudinal airflow arc extinguishing ducts 3.An electromagnetic valve structure 13 is provided at one end of the longitudinal blowing arc extinguishing duct 3 away from the connecting electrode 10. The electromagnetic valve structure 13 can transform the longitudinal blowing arc extinguishing duct from a sealed state to a semi-closed state, so that the overpressure formed in the sealed state of the longitudinal blowing arc extinguishing duct 3 can be blown out, avoiding the duct from exploding under overpressure and high temperature conditions. The ejection of strong airflow in the duct weakens the arc energy in a single arc extinguishing duct. In addition, there is no subsequent power frequency arc energy supply channel. Therefore, this setting method breaks the arc energy balance structure, increases the probability of arc extinguishing, and improves the arc extinguishing effect. In the present invention, the electromagnetic valve structure 13 is opened at the moment of impact arc generation, so that the longitudinal blowing arc extinguishing duct 3 is transformed from a sealed state to a semi-closed state. The closed state is transformed into a semi-closed state. In this embodiment, the solenoid valve structure 13 includes a current transformer, a relay and a solenoid valve. The primary side connector of the current transformer is connected to the anode 14 and the cathode 15 respectively, and the secondary side connector of the current transformer is connected to the relay. The relay is connected to the solenoid valve. The opening and closing of the solenoid valve is controlled by the relay. The opening and closing principle is that at the moment the impact arc is generated, a large current is formed between the anode 14 and the cathode 15. The large current is converted into a small current through the action of the current transformer. The small current flows to the relay. When the current value of the small current is greater than the preset value of the relay, the actuator of the relay operates to prompt the solenoid valve to open, thereby realizing the self-opening of the solenoid valve.

[0038] In the present invention, the electric arc of the longitudinal airflow arc extinguishing body passes through each longitudinal airflow arc extinguishing pipe 3 in turn, and then enters the transverse airflow arc extinguishing pipe 4 through the ball electrode 9 at the end of the transverse airflow arc extinguishing pipe 4 for transverse arc extinguishing, and then enters the next layer of longitudinal airflow arc extinguishing body through the ball electrode 9 at the other end for longitudinal arc extinguishing. In the transverse airflow arc extinguishing pipe 4, the electric arc passes through each ball arc in turn. When passing through the transverse blown fracture 8 between two adjacent ball electrodes 9, a strong airflow is blown out from the transverse blown fracture 8, thereby lengthening the arc and improving the arc extinguishing effect. Preferably, all the transverse blown fractures 8 on the transverse airflow arc extinguishing pipe 4 are located on the same side of the transverse airflow arc extinguishing pipe 4. In this embodiment, the ball electrode 9 connected to the longitudinal airflow arc extinguishing pipe 3 is integrated with the cathode 15 of the longitudinal airflow arc extinguishing pipe 3.

[0039] Furthermore, in this embodiment, a longitudinal airflow arc extinguishing body is arranged between two adjacent skirts, a longitudinal airflow arc extinguishing body is arranged between the skirt at the head end of the lightning protection insulator body 1 and the low-voltage grounding electrode 5 at that end, and a longitudinal airflow arc extinguishing body is arranged between the skirt at the tail end of the lightning protection insulator body 1 and the high-voltage electrode 6 at that end.

[0040] Furthermore, the arc extinguishing medium inside the longitudinal airflow arc extinguishing duct 3 is C4-PFN-CO2 or CF3I / CO2, or other CO2 mixed gases with good insulation performance and thermal breaking capacity, thereby ensuring arc extinguishing effectiveness.

[0041] Working principle of the present invention:

[0042] When a large-capacity, high-energy subsequent power-frequency arc is generated in the lightning protection insulator body 1, based on the principle of arc energy transfer, a three-electrode (anode 14, cathode 15, trigger electrode 16) semi-closed arc extinguishing structure is adopted, and the impact arc enters the longitudinal airflow arc extinguishing body and the transverse airflow arc extinguishing pipe through the arc guide electrode (low-voltage grounding arc or high-voltage arc). In the longitudinal airflow arc extinguishing body, the impact arc passes through the six longitudinal airflow arc extinguishing pipes 3 forming a hexagon in turn. Each longitudinal airflow arc extinguishing pipe 3 uses the trigger electrode 16 and the impact arc energy to quickly trigger the gas in the pipe to form a self-expanding airflow. The self-expanding airflow formed forces the arc current to be diverted, and at the front end of the longitudinal airflow arc extinguishing pipe 3 (where the solenoid valve structure 13 is located) At the end), the arc is blown out, the arc forms a fracture, the arc energy in the single longitudinal airflow arc extinguishing duct 3 is weakened, and there is no subsequent power frequency arc energy supply channel, so the arc energy balance structure is broken, and the probability of arc extinguishing is increased; at the same time, the impact arc is used to ignite multiple TNT arc extinguishing energy groups 17 from the trigger electrode 16 side to the anode 14 side in sequence in the longitudinal airflow arc extinguishing duct 3, and an explosion airflow is generated in the longitudinal airflow arc extinguishing duct 3. The explosion airflow is delayed coupled with the self-expanding airflow generated before to form a mixed arc extinguishing airflow, and a high-energy compression wave and an explosion shock wave superposition effect are generated in the movement of the mixed arc extinguishing airflow, thereby enhancing the coupled shock wave overpressure and prolonging the duration of the overpressure effect, thereby achieving the goal of suppressing the reignition of the power frequency arc. After passing through each longitudinal airflow arc extinguishing pipe 3 of the longitudinal airflow arc extinguishing body, the impact arc enters the transverse airflow arc extinguishing pipe 4 through the spherical electrode 9. The impact arc passes through the spherical electrodes 9 in the transverse airflow arc extinguishing pipe 4 in turn, and then enters the next layer of longitudinal airflow arc extinguishing body. In this way, the impact arc is extinguished step by step, effectively suppressing the arc reignition and improving the arc extinguishing effect.

[0043] It should be noted that the TNT arc extinguishing energy ball 17 of the present invention is a miniature ammunition.

[0044] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. Any equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A time-delay coupled mixed airflow arc extinguishing lightning protection device, characterized by: It includes two lightning protection insulator bodies, a grading ring, a skirt, a low-voltage grounding electrode and a high-voltage electrode; One end of the two lightning protection insulator bodies in the length direction is connected through a low-voltage grounding electrode, and the other end is connected through the high-voltage electrode; both ends of each lightning protection insulator body in the length direction are provided with a grading ring, and each lightning protection insulator body is provided with a plurality of skirts at intervals along its length direction, and the skirts are located between the grading rings at both ends of the lightning protection insulator body; An arc extinguishing path is provided inside each lightning protection insulator body, and the arc extinguishing path extends from one end to the other end in the length direction of the lightning protection insulator body; the arc extinguishing path is mainly composed of a number of longitudinal airflow arc extinguishing bodies and a number of transverse airflow arc extinguishing pipes; both ends of the arc extinguishing path are longitudinal airflow arc extinguishing bodies, and a transverse airflow arc extinguishing pipe is provided between two adjacent longitudinal airflow arc extinguishing bodies; each longitudinal airflow arc extinguishing body is mainly composed of a number of longitudinal airflow arc extinguishing pipes connected to form a regular hexagonal structure, wherein the plane where the hexagon is located is parallel to the length direction of the lightning protection insulator body; the wall of each longitudinal airflow arc extinguishing pipe is made of insulating material, one end of which in the length direction is provided with an anode, and the other end is provided with a cathode and An electromagnetic valve structure, wherein the interior of the longitudinal airflow arc-extinguishing duct is connected to the outside world through the electromagnetic valve structure, a trigger electrode and a plurality of TNT arc-extinguishing energy groups are provided in the longitudinal airflow arc-extinguishing duct, the trigger electrode is located between the anode and the cathode, and all the TNT arc-extinguishing energy groups are located between the anode and the trigger electrode, and are sequentially spaced along the tube length direction of the longitudinal airflow arc-extinguishing duct; the tube length direction of each transverse airflow arc-extinguishing duct is parallel to the length direction of the lightning protection insulator body, a plurality of ball electrodes are provided in the transverse airflow arc-extinguishing duct, and all the ball electrodes are sequentially spaced along the tube length direction of the transverse airflow arc-extinguishing duct, and a transverse blow fracture is opened on the tube wall between two adjacent ball electrodes of the transverse airflow arc-extinguishing duct; In the longitudinal airflow arc extinguishing body, two longitudinal airflow arc extinguishing pipes form a pair of longitudinal airflow arc extinguishing pipes, and the anodes of the two longitudinal airflow arc extinguishing pipes in each pair of longitudinal airflow arc extinguishing pipes are sealed and connected by connecting electrodes. The solenoid valve structures of the two longitudinal airflow arc extinguishing pipes close to each other in the two adjacent pairs of longitudinal airflow arc extinguishing pipes are opposite, and the connection between the two is not a sealed connection; The spherical electrodes at the head and tail ends of the transverse airflow arc extinguishing pipe between two adjacent longitudinal airflow arc extinguishing bodies are respectively connected to the cathode of a longitudinal airflow arc extinguishing pipe on the two longitudinal airflow arc extinguishing bodies; the longitudinal airflow arc extinguishing body close to the low-voltage grounding electrode is electrically connected to the low-voltage grounding electrode, and the longitudinal airflow arc extinguishing body close to the high-voltage electrode is electrically connected to the high-voltage electrode.

2. The time-delay coupled mixed airflow arc extinguishing lightning protection device according to claim 1, characterized in that: The skirt is divided into a first skirt and a second skirt. The outer contour size of the first skirt is larger than the outer contour size of the second skirt. A second skirt is arranged between two adjacent first skirts.

3. The delayed coupled mixed airflow arc extinguishing lightning protection device according to claim 1, characterized in that: A longitudinal airflow arc extinguishing body is arranged between two adjacent skirts, a longitudinal airflow arc extinguishing body is arranged between the skirt at the head end of the lightning protection insulator body and the low-voltage grounding electrode at that end, and a longitudinal airflow arc extinguishing body is arranged between the skirt at the tail end of the lightning protection insulator body and the high-voltage electrode at that end.

4. The delayed coupled mixed airflow arc extinguishing lightning protection device according to claim 1, characterized in that: The arc extinguishing medium inside the longitudinal airflow arc extinguishing pipe is C4-PFN-CO2 or CF3I / CO2.

5. The delayed coupled mixed airflow arc extinguishing lightning protection device according to claim 1, characterized in that: All the transverse blowing fractures on the transverse blowing arc extinguishing pipe are located on the same side of the transverse blowing arc extinguishing pipe.

6. The delayed coupled mixed airflow arc extinguishing lightning protection device according to claim 1, characterized in that: The connecting electrodes are trapezoidal electrodes.

7. The delayed coupled mixed airflow arc extinguishing lightning protection device according to claim 1, characterized in that: The solenoid valve structure includes a current transformer, a relay and a solenoid valve. The primary side connector of the current transformer is connected to the anode and the cathode respectively, the secondary side connector of the current transformer is connected to the relay, and the relay is connected to the solenoid valve. The opening and closing of the solenoid valve is controlled by the relay.

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