A lightning protection device and arc extinguishing method for blowing out arc through a tortuous channel

Abstract

This invention relates to the field of power system lightning protection technology, specifically to a lightning protection device and method for extinguishing arcs by blowing air through a tortuous channel. The lightning protection device includes multiple lightning arrester units, a high-voltage electrode, and a low-voltage electrode. The multiple lightning arrester units are vertically connected end-to-end, with discharge electrodes at the connection points. Each lightning arrester unit includes an insulating main shaft and sheds spaced apart outside the insulating main shaft. A tortuous channel is provided inside the insulating main shaft, with air inlets formed at the corners of the tortuous channel. Gas-generating components are located between adjacent air inlets within the tortuous channel, without blocking the tortuous channel. The high-voltage electrode is located at the top of the lightning arrester unit at the top; the low-voltage electrode is located at the bottom of the lightning arrester unit at the bottom. The top of the tortuous channel is connected to either the high-voltage electrode or the discharge electrode, and the bottom is connected to either the low-voltage electrode or the discharge electrode. The tortuous channel extends the flashover path, facilitating rapid cooling. During flashover, the gas-generating components release gas upon heating, which blows out the arc within the channel.

Description

Technical Field

[0001] This invention relates to the field of power system lightning protection technology, specifically to a lightning protection device and arc extinguishing method that uses air blowing through a tortuous channel to extinguish the arc. Background Technology

[0002] Arc-extinguishing surge protection devices are core equipment for limiting lightning overvoltages in power systems, and their performance directly affects the safe and stable operation of transmission lines. Traditional arc-extinguishing surge protection devices for transmission lines mostly adopt a structure of gap discharge combined with current limiting resistors. The gap is simple and the gas generation in the short cavity can play a certain role in limiting overvoltages, but the arc extinguishing time is long and it is prone to reignition. There are key problems such as the high-energy arc being difficult to cool down quickly in a confined space and the inability of charged particles to recombine rapidly, leading to arc extinguishing delay and reignition. This can easily lead to line insulation damage, equipment burnout, and even serious accidents such as line tripping and power outage. Summary of the Invention

[0003] The purpose of this invention is to solve the problem of slow arc extinguishing in the discharge chamber of existing lightning protection devices, and to provide a lightning protection device and arc extinguishing method that uses air blowing through a tortuous channel to extinguish the arc.

[0004] The technical solution adopted in this invention is: a lightning protection device that extinguishes arcs through a tortuous channel by air blowing, the lightning protection device comprising, Multiple lightning protection body units are vertically spaced and fixedly connected. Discharge electrodes are provided in the gap between the opposing sides of adjacent lightning protection body units. Each lightning protection body unit includes an insulating main shaft and a skirt that is vertically spaced and sleeved outside the insulating main shaft. At least one set of tortuous channels is provided inside the insulating main shaft. Air blowing ports that communicate with the outside are provided at the corners of the tortuous channels. Gas generating components that release arc-blowing gas when the lightning strike heats up are provided between adjacent air blowing ports in the tortuous channels. High-voltage electrode, which is located at the top of the lightning protection body unit at the top; Low-voltage electrode, which is located at the bottom of the lightning protection body unit at the bottom end; The top of the tortuous channel is connected to a high-voltage electrode or a discharge electrode, and the bottom is connected to a low-voltage electrode or a discharge electrode.

[0005] Furthermore, a discharge electrode is provided at the connection point of adjacent lightning protection body units, the discharge electrode being used to flash over with the electrode at the top of the upper lightning protection body unit and the electrode at the bottom of the lower lightning protection body unit.

[0006] Furthermore, the tortuous channel includes multiple straight channels connected end to end, and the insulating main shaft is provided with multiple layers of air blowing ports. The air blowing ports of two adjacent layers are located on both sides of the insulating main shaft and are connected through the straight channels; the gas generating element is provided in the straight channels.

[0007] Furthermore, the straight channel intersects the central axis of the insulating spindle; the air inlet is arranged radially along the insulating spindle.

[0008] Furthermore, the air inlet has a conical structure with a smaller inner end and a larger outer end, and the smaller end of the air inlet is connected to a tortuous channel; the conical opening angle of the air inlet is 90-150°.

[0009] Furthermore, the angle of the bend formed by adjacent straight channels is 60° to 90°; the bend includes at least 4 corners.

[0010] Furthermore, the diameter of the straight channel is 2~10mm.

[0011] Furthermore, the diameter of the straight channel is 4-8 mm.

[0012] Furthermore, the spacing between the umbrella skirts is 50-60mm.

[0013] Furthermore, the lightning protection unit is provided with two sets of tortuous channels; the two sets of tortuous channels are symmetrically arranged along the central axis of the insulating main shaft, so that the two sets of tortuous channels are connected multiple times on the central axis of the insulating main shaft, and the air inlets of each layer are symmetrically arranged on the left and right. The top and bottom ends of the two sets of tortuous channels are connected to the central axis of the insulating main shaft. One set of tortuous channels includes multiple segments of first straight channels connected end to end, and the other set of tortuous channels includes multiple segments of second straight channels connected end to end. The air inlet on the left side of the first layer is connected to the air inlet on the right side of the adjacent layer through the first straight channel, and the air inlet on the right side of the first layer is connected to the air inlet on the left side of the adjacent layer through the second straight channel. The first straight channel and the second straight channel are connected in the middle of the insulating main shaft. The high-voltage electrode, the low-voltage electrode and the discharge electrode are all located on the central axis of the insulating main shaft.

[0014] Furthermore, gas generating components are provided on the tortuous channel between the air inlet and the electrode, and between the air inlet and the intersection of the two sets of tortuous channels.

[0015] Furthermore, adjacent lightning protection units are fixedly connected at intervals by connecting components, and discharge electrodes with discharge gaps are provided on the opposite sides.

[0016] Furthermore, the connection assembly includes two connecting discs fixedly sleeved on the opposite ends of adjacent surge arrester body units and multiple bolts, with each bolt simultaneously connecting two connecting discs, thus fixing the two connecting discs at intervals.

[0017] Furthermore, the bolt passes through a connecting plate, two spaced limiting nuts, another connecting plate, and a locking nut in sequence. One limiting nut locks one connecting plate to the locking nut, and the other limiting nut locks the other connecting plate to the bolt nut, thereby coaxially and spacedly fixing the two lightning protection body units together.

[0018] Furthermore, the four bolts are circumferentially spaced, and together with the corresponding locking nuts and limit nuts, the two connecting discs are fixed at relative intervals.

[0019] Furthermore, the bolt is made of insulating material; the bolt is made of glass fiber epoxy resin.

[0020] Furthermore, the inner wall of the tortuous channel is provided with an alumina ceramic coating.

[0021] Furthermore, the gas-generating material of the gas-generating component includes polyamide 66.

[0022] Another aspect of the present invention provides a method for rapid arc extinguishing, using the lightning protection device for arc extinguishing via a tortuous channel provided by the present invention, the method comprising, When lightning overvoltage is transmitted to the high-voltage electrode, flashover occurs in the tortuous channel between the high-voltage electrode and the discharge electrode, extending the flashover path on the lightning protection unit. The overvoltage is transferred to the low-voltage electrode by flashing through the discharge electrode at the connection of adjacent lightning protection units. The flashover heats up the inner cavity of the tortuous channel, causing the gas-generating component to decompose and release the arc-blowing gas. The arc-blowing gas flows along a tortuous channel and is ejected from the blowhole, carrying away the electric arc generated within the tortuous channel.

[0023] The beneficial effects of this invention include: 1. By setting multiple lightning arrester body units with gaps, overvoltage is transmitted through flashover of the discharge electrodes on the opposite sides of adjacent lightning arrester body units during a lightning strike; the flashover path is lengthened by the tortuous channel on the lightning arrester body unit, which facilitates rapid cooling; an air blowing port connected to the outside is provided at the corner of the tortuous channel, and the gas generating component is located in the tortuous channel. During a lightning strike, flashover in the tortuous channel increases the temperature inside the cavity, causing the gas generating component to decompose and release arc blowing gas. The arc blowing gas flows in the tortuous channel and is ejected from the air blowing port to carry away the charged gas, which can achieve rapid arc extinguishing. 2. The tortuous channel structure is simple. It uses multiple straight channels connected end to end at an angle to lengthen the flashover path and facilitate rapid cooling. 3. The straight channel is located in the middle of the insulating spindle and is aligned with the central axis of the insulating spindle. This allows for a greater extension of the channel length. The air inlet is radially positioned to facilitate the ejection of the arc-blowing gas generated in the adjacent straight channels. 4. The air inlet has a conical structure, with the small end connected to a tortuous channel. The blowing gas in the tortuous channels on the upper and lower sides of the air inlet enters the air inlet and forms a turbulent airflow that is ejected, which facilitates the rapid diffusion of the blowing gas after it is ejected. 5. The angle of the bend formed by adjacent straight channels is 60-90°, which facilitates the effective lengthening of the arc path and the convergence and outflow of airflow on both sides of the air outlet; at least 4 bends ensure the path length of the tortuous channel; 6. The insulated spindle has two sets of tortuous channels, which can significantly increase the total arc length and surface discharge area. During a lightning strike, the flashover occurs in the two tortuous channels, which helps to reduce the conductivity of the air in the channels and further prevent the arc from reigniting. 7. The connection component has a simple structure. It is fixed to the opposite side of the upper and lower adjacent lightning protection body units by connecting plates. Multiple bolts are used to simultaneously connect the upper and lower connecting plates, so as to achieve coaxial and spaced fixed connection of multiple lightning protection body units, which provides a better diffusion effect for the electric arc generated by the flashover of the discharge electrode. 8. The alumina ceramic coating on the inner wall of the tortuous channel can prevent damage to the inner wall of the tortuous channel during lightning strikes, thus preventing it from affecting the electrical performance of the channel; 9. Using polyamide 66 as a gas generating component can pyrolyze hydrogen-containing gas and high-dissociation-energy gas. The hydrogen-containing gas has high thermal conductivity, which facilitates rapid heat transfer and absorption of energy in the electric arc. The high-dissociation-energy gas dissociates in the electric arc and absorbs more electric arc energy. The synergistic effect can improve the arc extinguishing effect. 10. The rapid arc extinguishing method of the present invention makes full use of the structural characteristics of the lightning protection device of the present invention. When lightning strikes, the total flashover path is extended by the flashover of the discharge electrodes between multiple lightning protection body units. The tortuous channel of a single lightning protection body unit extends the flashover path. The overvoltage flashes along the tortuous channel between the electrodes at the top and bottom ends of a single lightning protection body unit. When the temperature rises during flashover, the gas generating component generates arc-blowing gas. The arc-blowing gas is ejected from the gas blowing port to quickly extinguish the arc. Attached Figure Description

[0024] Figure 1 : A schematic diagram of a lightning protection device that extinguishes arcs by blowing air through a tortuous channel; Figure 2 : A schematic diagram of the structure of the lightning protection unit with discharge electrodes and low-voltage electrodes installed; Figure 3 A schematic diagram of an implementation scheme in which the lightning protection unit has a set of tortuous channels; Figure 4 : A structural diagram of an implementation scheme in which the lightning protection unit has two sets of tortuous channels; Wherein: 1-Lightning arrester body unit; 11-Insulating main shaft; 12-Umbrella skirt; 13-Turbulent channel; 131-Straight channel; 132-First straight channel; 133-Second straight channel; 14-Air blowing port; 15-Discharge electrode; 16-Gas generating component; 2-High voltage electrode; 3-Low voltage electrode; 4-Connecting assembly; 41-Connecting plate; 42-Bolt. Detailed Implementation

[0025] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and the drawings are not drawn to scale and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0026] In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

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

[0028] This invention relates to a lightning protection device that uses a tortuous channel for arc extinguishing via air blowing. It can be applied to power systems for overvoltage protection during lightning strikes. Multiple lightning arrester units 1 are spaced apart. During a lightning strike, the overvoltage is transmitted via flashover through the discharge electrodes 15 on the opposing sides of adjacent lightning arrester units 1. The tortuous channel 13 on the lightning arrester unit 1 lengthens the flashover path, facilitating rapid cooling. The corner of the tortuous channel 13 connects to the outside, forming an air blowing port 14. A gas generating element 16 is disposed within the tortuous channel 13. During a lightning strike, flashover within the tortuous channel 13 increases the internal temperature, causing the gas generating element 16 to decompose and release arc-extinguishing gas. The arc-extinguishing gas flows within the tortuous channel 13 and is ejected from the air blowing port 14, carrying away the charged gas and achieving rapid arc extinguishing.

[0029] A lightning protection device that extinguishes arcs through air blowing via a tortuous channel, specifically, such as... Figure 1-4As shown, the system includes multiple lightning protection body units 1, high-voltage electrodes 2, and low-voltage electrodes 3. The multiple lightning protection body units 1 are vertically connected end-to-end, meaning the bottom of an upper lightning protection body unit 1 is fixedly connected to the top of a lower lightning protection body unit 1. Discharge electrodes 15 are provided at the connection points of adjacent lightning protection body units 1. Each lightning protection body unit 1 includes an insulating main shaft 11 and vertically spaced umbrella skirts 12 sleeved outside the insulating main shaft 11. The insulating main shaft 11 has at least one set of tortuous channels 13. Air inlets 14 communicating with the outside are provided at the corners of the tortuous channels 13. Gas generating components 16, which release arc-blowing gas when heated by lightning strikes, are located between adjacent air inlets 14 within the tortuous channels 13. To ensure smooth flow of the arc-blowing gas within the tortuous channels 13, so that it can be ejected from the air inlets 14 to carry away the charged gas and achieve rapid arc extinguishing. The gas generating component 16 does not block the tortuous channel 13, facilitating flashover within the tortuous channel 13 during a lightning strike; the high-voltage electrode 2 is located at the top of the lightning protection body unit 1 at the top; the low-voltage electrode 3 is located at the bottom of the lightning protection body unit 1 at the bottom; the top of the tortuous channel 13 is connected to the high-voltage electrode 2 or the discharge electrode 15, and the bottom is connected to the low-voltage electrode 3 or the discharge electrode 15. The top of the tortuous channel 13 of the uppermost lightning protection body unit 1 is connected to the high-voltage electrode 2, and the bottom is connected to the discharge electrode 15. The top of the tortuous channel 13 of the lowermost lightning protection body unit 1 is connected to the discharge electrode 15, and the bottom is connected to the low-voltage electrode 3. When there are 3 or more lightning protection body units 1, the top and bottom ends of the lightning protection body unit 1 located in the middle part (between the top and bottom lightning protection body units 1) are both connected to the discharge electrode 15.

[0030] like Figure 3 As shown, the tortuous channel 13 is located inside the insulating main shaft 11. Electrodes are provided at both the top and bottom ends of the insulating main shaft 11. During a lightning strike, the electric field is forcibly confined in the air gap inside the channel. The conductivity of the insulating main shaft 11 is lower than that of the air inside the tortuous channel 13. The overvoltage flashes along the tortuous channel 13 between the electrodes at the top and bottom ends of the insulating main shaft 11, avoiding breakdown of the middle part of the insulating main shaft 11. Multiple lightning arrester bodies are spaced apart and have discharge electrodes 15 at opposite ends, so that the high voltage electrode 2 flashes with the low voltage electrode 3 through multiple discharge electrodes 15, so that the overvoltage can be transmitted from the high voltage electrode 2 to the low voltage electrode 3.

[0031] In one embodiment, not shown in the figure, a discharge electrode 15 is provided at the connection of adjacent lightning protection body units 1. The discharge electrode 15 is used to flash over with the electrode (high voltage electrode 2 or discharge electrode 15) at the top of the upper lightning protection body unit 1 and the electrode at the bottom of the lower lightning protection body unit 1. The discharge electrode 15 is simultaneously connected to the tortuous channel 13 of the two adjacent upper and lower lightning protection body units 1.

[0032] The gas generating component 16 can be circular, block-shaped, plate-shaped, etc. It can be fixed in the tortuous channel 13 without blocking the cross-section of the tortuous channel 13. Preferably, the cross-sectional area of ​​the tortuous channel 13 occupied by the gas generating component 16 does not exceed 60%.

[0033] In one implementation scheme, such as Figure 1 As shown, the air inlet 14 is located between two adjacent umbrella skirts 12. Preferably, the umbrella skirts 12 and the air inlet 14 are alternately arranged in the vertical direction.

[0034] In one implementation scheme, such as Figure 3 As shown, the tortuous channel 13 includes multiple straight channels 131 connected end to end. Adjacent straight channels 131 are connected at an angle. The insulating main shaft 11 is provided with multiple layers of air blowing ports 14. The air blowing ports 14 of adjacent layers are located on both sides of the insulating main shaft 11 and are connected through the straight channels 131. The tortuous channel 13 lengthens the flashover path on the lightning protection body unit 1, which facilitates rapid cooling. A gas generating component 16 is fixedly installed in the straight channel 131. The lengths of the multiple straight channels 131 can be different. The electrode shown in the figure is located in the middle area of ​​the end of the insulating main shaft 11. The straight channels 131 at the top and bottom ends of the tortuous channel 13 are relatively shorter.

[0035] In one implementation scheme, as shown in the figure, the straight channel 131 intersects the central axis of the insulating spindle 11, which can extend the length of the tortuous channel 13 to a greater extent; the air blowing port 14 is arranged radially along the insulating spindle 11 to facilitate the blowing out of the arc-blowing gas generated in the adjacent straight channels 131, and to avoid the arc-blowing gas located at the upper or lower end of the air blowing port 14 in the tortuous channel 13 being greatly obstructed.

[0036] In one implementation scheme, such as Figure 3-4 As shown, the air inlet 14 has a conical structure with a smaller inner end and a larger outer end. The smaller end of the air inlet 14 is connected to the tortuous channel 13. The open conical structure facilitates the rapid diffusion of the blown gas after it is ejected. The conical opening angle of the air inlet 14 is 90-150°, that is, the included angle formed by the conical surface of the air inlet 14 on the cross section passing through the axis of the cone is preferably 90-150°.

[0037] In one implementation scheme, such as Figure 3 As shown, the bend angle formed by adjacent straight channels 131 is 60°~90°; the tortuous channel 13 includes at least 4 bends to ensure that the arc length is sufficiently extended to achieve effective heat dissipation, and the number of tortuous channels 13 increases according to the voltage demand level.

[0038] Optionally, the diameter of the straight channel 131 is 2-10mm, preferably 4-8mm, to balance the requirements of arc confinement and gas flow; the spacing of the umbrella skirts 12 is 50-60mm (the vertical distance between the outer edges of the umbrella skirts 12).

[0039] In one implementation, such as Figure 1 As shown, the lightning protection device includes two lightning protection body units 1, which are coaxially spaced apart. When applied to a 10kV power distribution line, the diameter of the tortuous track cavity of each lightning protection body unit 1 is 4mm, with 6 bends, including 5 straight channels 131; when applied to a 110kV power distribution line, the diameter of the tortuous track cavity is 6mm, with 10 bends, including 9 straight channels 131.

[0040] In some implementations, such as Figure 4 As shown, the lightning protection body unit 1 is provided with two sets of tortuous channels 13; the two sets of tortuous channels 13 are symmetrically arranged along the central axis of the insulating main shaft 11, so that the two sets of tortuous channels 13 are connected multiple times on the central axis of the insulating main shaft 11, and the air inlets (14) of each layer are symmetrically arranged on the left and right. The top and bottom ends of the two sets of tortuous channels 13 are connected to the central axis of the insulating main shaft 11. One set of tortuous channels 13 includes multiple first straight channels 132 connected end to end, and the other set of tortuous channels 13 includes multiple second straight channels 133 connected end to end; one layer The air outlet 14 on the left side is connected to the air outlet 14 on the right side of the adjacent layer through a first straight channel 132, and the air outlet 14 on the right side of the layer is connected to the air outlet 14 on the left side of the adjacent layer through a second straight channel 133; the first straight channel 132 and the second straight channel 133 are connected in the middle of the insulating main shaft 11; the gas generating element 16 is located in the tortuous channel 13, avoiding the intersection of the two sets of tortuous channels 13; the high-voltage electrode 2, the low-voltage electrode 3, and the discharge electrode 15 are all located on the central axis of the insulating main shaft 11, so that flashover is generated in both sets of tortuous channels 13. The two sets of tortuous channels 13 can significantly increase the total arc length and the surface discharge area. During a lightning strike, flashover occurs in both tortuous channels 13, and the arc-blowing gas generated by the gas generating element 16 can be blown from one set of tortuous channels 13 to the other set of tortuous channels 13, which helps to reduce the conductivity of the air in the channel and prevent the arc from reigniting.

[0041] In one implementation scheme, such as Figure 4 As shown, gas generating components 16 are provided on the tortuous channel 13 between the air blowing port 14 and the electrodes (high-voltage electrode 2, discharge electrode 15, low-voltage electrode 3) and between the air blowing port 14 and the intersection of the two sets of tortuous channels 13. That is, gas generating components 16 are provided between the high-voltage electrode 2 and the adjacent air blowing port 14, between the discharge electrode 15 and the adjacent air blowing port 14, between the low-voltage electrode 3 and the adjacent air blowing port 14, and between the intersection of the two sets of tortuous channels 13 and the adjacent air blowing port 14 on the channel.

[0042] In one implementation scheme, such as Figure 1As shown, adjacent lightning protection body units 1 are vertically spaced and fixed together. The gap between the opposing sides of the adjacent lightning protection body units 1 is provided with discharge electrodes 15, that is, there is a discharge gap between the discharge electrodes 15 on the opposing sides of the adjacent lightning protection body units 1. Two discharge electrodes 15 are provided at the connection of the adjacent lightning protection body units 1. The high voltage electrode 2 flashes with the discharge electrode 15 at the bottom of the lightning protection body unit 1, and then flashes through the discharge electrode 15 in the gap to the lower lightning protection body unit 1. The lower lightning protection body unit 1 flashes through the discharge electrode 15 at the top and the electrode at the bottom, and then flashes through to the low voltage electrode 3 in sequence.

[0043] In one implementation scheme, such as Figure 1 As shown, multiple surge arrester body units 1 are coaxially and spaced together by connecting components 4. The connecting components 4 include two connecting discs 41 and multiple bolts 42. The two connecting discs 41 (such as flanges) are respectively fixedly fitted onto the opposing ends of adjacent surge arrester body units. Connecting holes for the bolts 42 are pre-drilled on the connecting discs 41. Multiple bolts 42 are circumferentially spaced, and each bolt 42 simultaneously bolts two connecting discs 41, fixing the two connecting discs 41 at intervals. The connecting holes can be threaded holes. The bolts 42 are made of insulating material, such as fiberglass epoxy resin, while the connecting discs 41 can be made of metal to ensure a secure connection with the insulating spindle 11.

[0044] In one specific embodiment (not shown in the figure), four bolts 42 are circumferentially spaced, and together with corresponding locking nuts and limit nuts, fix the two connecting discs 41 at relative intervals.

[0045] In addition, in the scheme where the connecting hole has no internal thread, the bolt 42 passes through a connecting plate 41, two spaced limiting nuts, another connecting plate 41, and a locking nut in sequence. One limiting nut locks the connecting plate 41 to the locking nut, and the other limiting nut locks the other connecting plate 41 to the nut of the bolt 42. The two limiting nuts vertically limit the two connecting plates 41, thereby fixing the two lightning protection body units 1 coaxially and spacedly together.

[0046] In one implementation, the inner wall of the tortuous channel 13 is provided with an insulating alumina ceramic coating that is heat-resistant and has a smooth surface, guiding the electric arc to crawl along the surface of the alumina ceramic coating during overvoltage.

[0047] In one embodiment, the gas-generating material of the gas-generating component 16 includes polyamide 66 (PA66, C). 12 H 22O2N2) can be placed in a container with an opening and fixed to the inner wall of the tortuous channel 13. During a lightning flashover, the inner cavity of the channel heats up, causing the polyamide 66 to pyrolyze and generate arc-blowing gas. The arc-blowing gas includes a mixture of hydrogen-containing gas (such as H2, CH4) and high-dissociation-energy gas (such as CO2, N2). The hydrogen-containing gas has high thermal conductivity and fast heat transfer. The high-dissociation-energy gas absorbs more energy in the arc to complete dissociation and accelerates the dissipation of arc energy. When the arc-blowing gas flows in the tortuous channel 13, it is ejected from the blowing port 14. The synergistic effect can quickly extinguish the arc.

[0048] In one specific embodiment, the insulating main shaft 11 is fitted with an insulating composite jacket, which can be integrally formed with the umbrella skirt 12. The composite jacket is preferably made of composite silicone rubber, and the insulating main shaft 11 can be made of epoxy resin or composite silicone rubber. The composite jacket is provided with a clearance hole corresponding to the air outlet 14, and the inner diameter of the clearance hole is equal to and coaxial with the outer diameter of the air outlet 14.

[0049] In practical applications, such as Figure 4 As shown, the lightning protection device of the present invention includes two coaxially spaced and fixedly connected lightning protection body units 1. The upper lightning protection body unit 1 has a high-voltage electrode 2 at its top and a discharge electrode 15 for gap discharge at its bottom. The lower lightning protection body unit 1 has a discharge electrode 15 at its top and a low-voltage electrode 3 at its bottom. Each lightning protection body unit 1 has two symmetrical tortuous channels 13 inside its insulating main shaft 11. Each tortuous channel 13 includes multiple straight channels 131 connected end to end. The connection between adjacent straight channels 131 is connected to an air blowing port 1. 4. The angle of the bend is 60-90°. Multiple umbrella skirts 12 are spaced around the outside of the insulating main shaft 11. Two tortuous channels 13 intersect and connect on the central axis of the insulating main shaft 11. Air inlets 14 are provided on the insulating main shaft 11 at the corners of the tortuous channels 13. The air inlets 14 are set away from the insulating umbrella skirts 12. The air inlets 14 have a conical structure with the small end connected to the tortuous channels 13 and are arranged radially along the insulating main shaft 11. Gas generating elements 16 are provided on the tortuous channels 13 between adjacent air inlets 14.

[0050] Another aspect of the present invention provides a method for rapid arc extinguishing, using the lightning protection device for arc extinguishing via a tortuous channel provided by the present invention, the method comprising: S1. When the lightning overvoltage is transmitted to the high voltage electrode 2, flashover occurs between the high voltage electrode 2 and the discharge electrode 15 at both ends of the lightning protection body unit 1 along the tortuous channel 13, extending the flashover path on the lightning protection body unit 1. S2. Through the discharge electrode 15 at the connection of adjacent lightning protection body units, the high voltage electrode 2 flashes through the discharge electrode 15 and the low voltage electrode 3, and the overvoltage is transferred to the low voltage electrode 3; when the lightning protection body units 1 are fixedly connected at intervals and the discharge electrodes 15 with discharge gaps are provided on the opposite side, the high voltage electrode 2 flashes through the discharge electrode 15 with discharge gaps on the opposite side of the adjacent lightning protection body units 1, and the total flashover path of this lightning protection device is extended. S3. The inner cavity of the tortuous channel 13 is heated by flashover, so that the gas generating element 16 is heated and decomposed to release the arc-blowing gas; including using the gas generating element 16 to decompose and release the arc-blowing gas during flashover heating and spray it out from the gas blowing port 14 to increase the arc extinguishing effect. S4. The arc-blowing gas flows along the tortuous channel 13 and is ejected from the air outlet 14, carrying away the electric arc generated in the tortuous channel 13.

[0051] The lightning protection device provided by this invention, which uses a tortuous channel for air-blown arc extinguishing, introduces overvoltage through the high-voltage electrode 2 and transmits it to the lightning protection body unit 1. Multiple lightning protection body units 1 are connected end-to-end, extending the total flashover path. Through the discharge electrode 15 between the lightning protection body units 1, the high-voltage electrode 2 and the low-voltage electrode 3 can transmit overvoltage via flashover through the discharge electrode 15. A tortuous channel 13 located inside the insulating main shaft 11 connects the electrodes at both ends of the insulating main shaft 11, allowing flashover to occur within the tortuous channel 13 and generate an electric arc. The tortuous channel 13 cavity... The design of the channel can significantly increase the arc length and surface area, and the arc lengthening facilitates rapid cooling. During flashover, the inner cavity of the tortuous channel 13 heats up, and the gas generating element 16, located inside the tortuous channel 13, decomposes under heat to release arc-blowing gas. The arc-blowing gas is ejected from the air blowing port 14 at the corner of the tortuous channel 13, carrying away the charged gas. The arc-blowing gas absorbs arc energy and has the effect of forced air cooling, which, together with the lengthening and cooling effect of the tortuous channel 13, extinguishes the arc within milliseconds, reducing the arc extinguishing time from more than 10ms in traditional devices to less than 2ms.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A lightning protection device that extinguishes arcs through a tortuous channel by air blowing, characterized in that: include Multiple lightning protection body units (1) are vertically fixedly connected end to end, and discharge electrodes (15) are provided at the connection points of adjacent lightning protection body units (1). The lightning protection body unit (1) includes an insulating main shaft (11) and a skirt (12) vertically spaced outside the insulating main shaft (11). At least one set of tortuous channels (13) is provided inside the insulating main shaft (11). An air blowing port (14) communicating with the outside is provided at the corner of the tortuous channel (13). A gas generating component (16) that releases arc blowing gas when the lightning strike heats up is provided between adjacent air blowing ports (14) in the tortuous channel (13). High voltage electrode (2), the high voltage electrode (2) is located on the top of the lightning protection body unit (1) at the top; Low-voltage electrode (3), the low-voltage electrode (3) is located at the bottom of the lightning protection body unit (1) at the bottom end; The top end of the tortuous channel (13) is connected to a high-voltage electrode (2) or a discharge electrode (15), and the bottom end is connected to a low-voltage electrode (3) or a discharge electrode (15).

2. The lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 1, characterized in that: The tortuous channel (13) includes multiple straight channels (131) connected end to end. The insulating main shaft (11) is provided with multiple layers of air blowing ports (14). The air blowing ports (14) of two adjacent layers are located on both sides of the insulating main shaft (11) and are connected through the straight channel (131). The gas generating component (16) is provided in the straight channel (131).

3. The lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 2, characterized in that: The straight channel (131) intersects the central axis of the insulating main shaft (11); the air inlet (14) is arranged radially along the insulating main shaft (11).

4. A lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 2, characterized in that: The air inlet (14) has a conical structure with a small inner end and a large outer end. The small end of the air inlet (14) is connected to the tortuous channel (13). The conical opening angle of the air inlet (14) is 90-150°.

5. A lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 2, characterized in that: The angle formed by adjacent straight channels (131) is 60°~90°; the tortuous channel (13) includes at least 4 corners.

6. A lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 1, characterized in that: Adjacent lightning protection body units (1) are fixedly connected at intervals by connecting components (4), and discharge electrodes (15) with discharge gaps are provided on the opposite sides.

7. A lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 6, characterized in that: The connection assembly (4) includes two connecting discs (41) fixedly sleeved on the opposite ends of adjacent surge arrester body units and multiple bolts (42). Each bolt (42) simultaneously bolts two connecting discs (41), fixing the two connecting discs (41) at intervals.

8. A lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 1, characterized in that: The lightning protection body unit (1) is provided with two sets of tortuous channels (13); the two sets of tortuous channels (13) are symmetrically arranged along the central axis of the insulating main shaft (11), so that the two sets of tortuous channels (13) are connected multiple times on the central axis of the insulating main shaft (11), and the air inlets (14) of each layer are symmetrically arranged on the left and right. The top and bottom ends of the two sets of tortuous channels (13) are connected to the central axis of the insulating main shaft (11). One set of tortuous channels (13) includes multiple segments of the first straight channel (132) connected end to end, and the other set of tortuous channels (13) includes The first straight channel (133) is connected to the second straight channel (133) with multiple segments connected end to end; the air outlet (14) on the left side of the first layer is connected to the air outlet (14) on the right side of the adjacent layer through the first straight channel (132); the air outlet (14) on the right side of the first layer is connected to the air outlet (14) on the left side of the adjacent layer through the second straight channel (133); the first straight channel (132) and the second straight channel (133) are connected in the middle of the insulating main shaft (11); the high voltage electrode (2), the low voltage electrode (3) and the discharge electrode (15) are all located on the central axis of the insulating main shaft (11).

9. A lightning protection device for extinguishing arcs by air blowing through a tortuous channel as described in claim 1, characterized in that: The inner wall of the tortuous channel (13) is provided with an alumina ceramic coating; the gas generating material of the gas generating component (16) includes polyamide 66.

10. A method for rapid arc extinguishing, characterized in that: The method, using the lightning protection device as described in any one of claims 1-9, includes... When the lightning overvoltage is transmitted to the high voltage electrode (2), a flashover occurs between the high voltage electrode (2) and the discharge electrode (15) along the tortuous channel (13), extending the flashover path on the lightning protection body unit (1); Through the discharge electrode (15) at the connection of adjacent lightning protection body unit (1), the high voltage electrode (2) flashes over with the low voltage electrode (3) through the discharge electrode (15), and the overvoltage is transferred to the low voltage electrode (3). The flashover heats up the inner cavity of the tortuous channel (13), causing the gas-generating component (16) to decompose and release the arc-blowing gas. The arc-blowing gas flows along the tortuous channel (13) and is ejected from the air outlet (14), carrying away the electric arc generated in the tortuous channel (13).

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