A new arc extinguishing lightning protection device

Abstract

The present application belongs to the technical field of lightning protection and arc extinguishing, and particularly relates to a novel lightning protection and arc extinguishing device, which solves the problem that the existing lightning protection and arc extinguishing device is prone to burst due to excessive pressure in the compressed pipeline when using compressed air for arc extinguishing. The arc extinguishing effect of the device is not affected by the size of the device and environmental conditions, but the arc is extinguished by using the chemical properties of the gas itself. SF6 gas is a strong electronegative gas, and its molecules are easily adsorbed by free electrons to form large negative ions, thereby weakening the collision ionization process in the gas. Therefore, the SF6 gas has excellent electrical insulation strength, excellent arc extinguishing effect, and stable protection effect. The device is provided with several levels of gas arc extinguishing channels to ensure that the electric arc can be completely extinguished. The tin ball is composed of inert gas SF6 and a shell. When the temperature in the channel rises, the shell is melted by high temperature, and the inert gas SF6 in the interior enters the arc extinguishing chamber together with the electric arc and completes the extinguishing of the electric arc in the arc extinguishing chamber.

Description

Technical Field

[0001] This invention belongs to the field of lightning protection and arc extinguishing technology, specifically relating to a novel arc extinguishing and lightning protection device. Background Technology

[0002] Lightning, a common and highly dangerous natural phenomenon, constantly threatens the safe operation of power transmission and distribution lines. Statistics show that lightning-induced tripping accidents account for 40%-70% of all accidents, a situation even more severe in southern regions. Lightning strikes are typically accompanied by high temperatures, shock waves, and intense electromagnetic radiation. When transmission lines are struck by lightning, these effects trigger massive flashovers, further causing flashovers in the line insulators. This generates huge power frequency follow currents, ultimately damaging the insulator strings and fittings, leading to line faults. In severe cases, it can even paralyze the entire power system, harming people's lives and national economic development.

[0003] Traditional "blocking" lightning protection methods, which limit the potential difference across insulators and suppress lightning strikes and arc flashovers, are constrained by various uncontrollable factors such as lightning intensity, strike type, and location, and are now obsolete. Currently, power companies typically protect power lines by installing parallel protective gaps or line surge arresters. While this represents an improvement over "blocking" lightning protection, it still has many drawbacks. Parallel protective gaps sacrifice tripping rates for higher accident rates, failing to extinguish the arc and potentially damaging equipment over time. Line surge arresters, on the other hand, suffer from high maintenance costs and short lifespans, hindering the long-term stable and safe operation of the power grid.

[0004] Therefore, in response to the shortcomings of the aforementioned lightning protection methods, gas arc extinguishing lightning protection methods have begun to appear widely in recent years. Current gas arc extinguishing methods primarily use compressed air for arc extinguishing. When the electric arc enters the arc extinguishing channel, the high temperature causes the air to expand rapidly. The narrow dimensions of the compressed pipe create a significant pressure difference between the inside and outside of the pipe, resulting in high-speed gas at the break point, thus extinguishing the arc. This method reduces costs compared to previous lightning protection methods and generally has a good arc extinguishing effect. However, because this method uses compressed air to blow away the arc, the airflow speed depends on the arc energy. If the arc energy is too high, the pressure inside and outside the pipe cannot be balanced in a short time, which may cause the device to explode, posing a certain risk. Conversely, if the arc is too small, the generated airflow speed will be too low to completely extinguish the arc. Therefore, improvements are urgently needed to enhance the stability of the device and better meet the needs of daily life. Summary of the Invention

[0005] To address the above problems, this invention provides a novel arc-extinguishing and lightning protection device, the specific technical solution of which is as follows:

[0006] A novel arc-extinguishing lightning protection device includes several stages of gas arc-extinguishing channels, an insulating layer, a lightning arresting electrode, a grounding electrode, and a fixing part;

[0007] The gas arc-extinguishing channels of several stages are connected end to end and interconnected, and the gas arc-extinguishing channels store sulfur hexafluoride gas for arc extinguishing;

[0008] The insulating layer is wrapped around the outside of the several stages of gas arc-extinguishing channels;

[0009] The lightning electrode is fixed to the top of the insulating layer, with one end exposed outside the insulating layer and the other end close to or extending into the first-stage gas arc extinguishing channel.

[0010] The grounding electrode is fixed to the bottom of the insulating layer, with one end exposed outside the insulating layer and the other end extending into the last stage gas arc extinguishing channel;

[0011] The fixing part is fixedly connected to the bottom of the insulating layer.

[0012] Preferably, the gas arc-extinguishing channel includes a gas channel, a solder ball, and an arc-extinguishing chamber;

[0013] The gas passage is located above the arc-extinguishing chamber and is connected to the arc-extinguishing chamber. The inner diameter of the gas passage is smaller than the inner diameter of the arc-extinguishing chamber.

[0014] The solder ball is placed inside the gas channel, and the outer diameter of the solder ball is smaller than the inner diameter of the gas channel; the solder ball contains sulfur hexafluoride gas.

[0015] Preferably, a solder ball support is provided on the inner wall of the gas channel to support the solder ball placed inside the gas channel, and the solder ball support is a hollow structure.

[0016] Preferably, the inner wall of the gas channel is a ceramic layer.

[0017] Preferably, the central axes of the gas channels of two adjacent gas arc-extinguishing channels are not on the same straight line.

[0018] Preferably, the end of the lightning electrode that is close to or extends into the first-stage gas arc-extinguishing channel is a pointed end.

[0019] Preferably, the end of the grounding electrode that extends into the final stage gas arc-extinguishing channel is a pointed tip.

[0020] Preferably, the material used to make the lightning rod is graphite.

[0021] Preferably, the gas arc extinguishing channel is provided with 3 or 4 stages.

[0022] This invention is installed at both ends of an insulator string via a fixing part, and its working process is as follows:

[0023] Step 1: When lightning strikes a tower or transmission line, a direct lightning strike or induced lightning overvoltage occurs on the line. Through insulation coordination, the lightning will preferentially break down the lightning protection gap. The lightning electrode at the top of this invention will form an upward leader through physical collision, Coulomb force action or tip discharge of the flashover arc, drawing the arc into the internal gas arc extinguishing channel.

[0024] Step 2: After the electric arc is drawn into the gas arc extinguishing channel, the electric arc still maintains a high energy and high temperature state. At this time, the electric arc will discharge in the gas channel, which will cause the air inside the gas channel to expand and the temperature to rise. Due to the temperature rise effect, the temperature inside the gas channel rises rapidly, causing the outer shell of the solder ball to melt. The SF6 gas inside is released and sprayed into the next stage arc extinguishing chamber.

[0025] Step 3: As a highly electronegative gas, SF6 molecules readily adsorb free electrons to form large negative ions, thereby weakening the collisional ionization process in the gas. In the arc extinguishing chamber, the electric arc interacts with the SF6 gas, causing the arc column to break, decompose, and dissipate. The arc energy is continuously weakened until it is completely extinguished.

[0026] Step 4: The present invention has a multi-stage gas arc extinguishing channel, namely a multi-stage gas channel and an arc extinguishing chamber, which ensures stable arc extinguishing. After the arc is extinguished, the arc extinguishing process is considered to be completely over.

[0027] The beneficial effects of this invention are as follows: This invention provides a novel arc-extinguishing and lightning protection device, solving the problem that existing lightning protection arc-extinguishing devices mostly utilize compressed air for arc extinguishing, which is prone to bursting due to excessive internal pressure in the compressed pipes. Its arc-extinguishing effect is not affected by the size of the device or environmental conditions, but rather utilizes the chemical properties of the gas itself for arc extinguishing. SF6 gas is a highly electronegative gas; its molecules readily adsorb free electrons to form large negative ions, thereby weakening the collisional ionization process in the gas. Therefore, it has excellent electrical insulation strength, excellent arc-extinguishing effect, and stable protection effect.

[0028] This invention features a simple structure, reasonable design, strong arc-extinguishing capability, and safe and reliable operation. The lightning arrestor electrode located at the top of the device effectively ensures the arc path and guarantees successful triggering of the arc-extinguishing gas. This invention uses SF6 inert gas for arc extinguishing, which is not constrained by gas velocity but utilizes its own properties to suppress the arc, resulting in a more stable arc-extinguishing effect.

[0029] This invention features several stages of gas arc-extinguishing channels to ensure complete extinguishing of the electric arc. The solder ball consists of an inert gas SF6 and a shell. When the temperature rises within the channel, the shell melts at high temperature, and the inert gas SF6 inside enters the arc-extinguishing chamber along with the electric arc, where it extinguishes the arc.

[0030] By employing this invention, the arc discharge that occurs when a power line is struck by lightning can be effectively suppressed, and the arc can be extinguished very well. By rapidly extinguishing the arc, the damage caused by lightning strikes can be reduced, ensuring the safe and stable operation of the power system. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0032] Figure 1 This is a schematic diagram of the structure of the present invention;

[0033] Figure 2 This is a schematic diagram illustrating the application principle of the present invention;

[0034] Figure 3 This is a simulation model diagram of an embodiment of the present invention;

[0035] Among them, 1-lightning electrode, 2-gas channel, 3-tin ball, 4-insulating layer, 5-arc extinguishing chamber, 6-grounding electrode, 7-fixing part, 8-crossarm, 9-insulator string, 10-lightning protection and arc extinguishing device, 11-ceramic layer;

[0036] Figure 4 A comparative curve of temperature distribution in gas arc-extinguishing channels of different stages;

[0037] Figure 5 A comparison curve of velocity distribution in gas arc-extinguishing channels of different stages. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0040] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0041] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0042] like Figure 1 As shown, a specific embodiment of the present invention provides a novel arc-extinguishing and lightning protection device, comprising several stages of gas arc-extinguishing channels, an insulating layer 4, a lightning electrode 1, a grounding electrode 6, and a fixing part 7.

[0043] The gas arc-extinguishing channels of several stages are connected end to end and interconnected, and each gas arc-extinguishing channel stores sulfur hexafluoride gas for arc extinguishing. Each gas arc-extinguishing channel includes a gas channel 2, a solder ball 3, and an arc-extinguishing chamber 5;

[0044] The gas channel 2 is located above and connected to the arc extinguishing chamber 5. The inner diameter of the gas channel 2 is smaller than the inner diameter of the arc extinguishing chamber 5 so that sulfur hexafluoride gas can be quickly injected into the arc extinguishing chamber 5 to extinguish the arc.

[0045] The solder ball 3 is placed inside the gas channel 2, and the outer diameter of the solder ball 3 is smaller than the inner diameter of the gas channel 2; the solder ball 3 stores sulfur hexafluoride gas. A solder ball support is provided on the inner wall of the gas channel 2 to support the solder ball 3 inside the gas channel 2. The solder ball support has a hollow structure so that the gas can enter the arc extinguishing chamber 5 below after the solder ball 3 melts. The solder ball support can be a pair of protrusions fixed to the inner wall of the gas channel 2 and arranged opposite each other in the circumferential direction. The relative straight-line distance between the protrusions is smaller than the diameter of the solder ball 3, thereby supporting the solder ball 3 inside the gas channel 2.

[0046] The solder ball support can also be a ring fixed to the inner wall of the gas channel 2. The outer circumference of the ring is fixedly connected to the inner wall of the gas channel 2, and the inner diameter of the ring is smaller than the diameter of the solder ball 3, so as to support the solder ball 3 placed inside the gas channel 2.

[0047] The solder ball support can also be an inverted hollow frustum structure set in the gas channel 2. The top inner diameter of the frustum is large and the outer diameter is the same as that of the gas channel 2. The bottom inner diameter of the frustum is small and smaller than the diameter of the solder ball 3, so as to support the solder ball 3 placed inside the gas channel 2.

[0048] The inner wall of the gas channel 2 is a ceramic layer 11. Ceramics are high-hardness, high-temperature and high-pressure resistant inorganic non-metallic materials. Ceramic materials possess excellent chemical and thermal stability, as well as good electrical and mechanical properties. Compared to plastics or metals, they exhibit superior material characteristics such as insulation, high-pressure resistance, wear resistance, resistance to deformation, heat resistance, and corrosion resistance. When the electric arc passes through the gas channel, the arc energy and the thermal expansion effect of the gas cause the internal temperature of the channel to rise sharply. The thermal stability of the insulating ceramic shell prevents damage to the device. Furthermore, its raw materials are inexpensive and the product is environmentally friendly and pollution-free, making it an ideal insulating material. This ensures that the gas channel 2 will not rupture due to excessive pressure, but instead, the gas is injected into the arc-extinguishing chamber 5 below to extinguish the electric arc.

[0049] The central axes of the gas channels 2 of two adjacent gas arc extinguishing channels are not on the same straight line. The sulfur hexafluoride gas of the previous stage can be fully utilized in the previous stage arc extinguishing chamber 5 before the sulfur hexafluoride gas of the next stage can be utilized, thereby improving the utilization efficiency of sulfur hexafluoride gas in each stage.

[0050] The insulating layer 4 is wrapped around the outside of the several gas arc extinguishing channels. The insulating layer 4 can be an insulating skirt, with one skirt corresponding to each gas arc extinguishing channel.

[0051] The lightning electrode 1 is fixed to the top of the insulating layer 4, with one end exposed outside the insulating layer 4 and the other end close to or extending into the first-stage gas arc extinguishing channel; the end of the lightning electrode 1 that is close to or extending into the first-stage gas arc extinguishing channel is a pointed tip, which facilitates the introduction of the electric arc into the next-stage gas arc extinguishing channel.

[0052] The lightning electrode 1 is made of graphite, which significantly extends the lifespan of the device. Graphite electrodes have excellent conductivity, easily guiding the electric arc into the downstream gas arc-extinguishing channel. Graphite is a non-metallic material, but its conductivity is 100 times stronger than that of ordinary non-metallic minerals. Each carbon atom in graphite is surrounded by three other carbon atoms, arranged in a honeycomb-like hexagonal structure. Since each carbon atom releases an electron, these electrons can move freely, making graphite a conductor. Generally, the discharge processing speed of graphite electrodes is 1.5 to 2 times faster than that of copper electrodes. In the event of a lightning strike on a transmission line, graphite electrodes effectively ignite the arc, allowing it to smoothly enter the arc-extinguishing tube. Graphite electrodes have an extremely high melting point, can withstand very high currents, and are not easily deformed; graphite electrodes possess the characteristic of withstanding high current conditions. Copper has a softening point of around 1000 degrees Celsius and is easily deformed by heat; while graphite has a sublimation temperature of around 3650 degrees Celsius, and lightning currents with an intensity between 5000 and 50,000 amperes can generate lightning temperatures exceeding 3000 degrees Celsius. Therefore, metal electrodes are extremely prone to deformation under the influence of high lightning currents, producing metal powder that splashes and damages the arc-extinguishing chamber structure, affecting the arc-extinguishing effect of the device. Using graphite electrodes can effectively avoid these problems. Graphite electrodes have low loss and the characteristic of withstanding high current conditions. Under the influence of a lightning arc, a polarity effect is generated, and some erosion materials and carbon particles adhere to the electrode surface, forming a protective layer. This ensures that the graphite electrode experiences minimal loss, or even "zero loss," during the recoil arc-extinguishing process.

[0053] The grounding electrode 6 is fixed to the bottom of the insulating layer 4, with one end exposed outside the insulating layer 4 and the other end extending into the last stage gas arc extinguishing channel; the end of the grounding electrode 6 extending into the last stage gas arc extinguishing channel is a pointed tip, which can better attract the arc and achieve the function of discharge.

[0054] The fixing part 7 is fixedly connected to the bottom of the insulating layer 4.

[0055] like Figure 2 As shown, the arc-extinguishing and lightning protection device 10 of the present invention is mounted on the crossarm 8 via the fixing part 7, and an insulator string 9 is installed between the two crossarms 8. The fixing part 7 may be threaded, and can be fixed to the crossarm 8 by engaging with a nut, or by other detachable fixing methods, such as snap-fit, which will not be described in detail here. The working process of the present invention is as follows:

[0056] Step 1: When lightning strikes a line, a direct lightning strike or induced lightning overvoltage will occur on the line. Excessive induced lightning overvoltage will cause flashover of the insulator, generating an impulse arc. The continuous burning of the arc will develop into a stable power frequency arc. At this time, the lightning electrode 1 of the present invention will come into play, forming an upward leader to constrain the arc by physical collision, Coulomb force, or tip discharge of the flashover arc, and guide it into the first-stage gas arc extinguishing channel for subsequent arc extinguishing process.

[0057] Step 2: After the electric arc is drawn into the first-stage gas arc extinguishing channel, the electric arc still maintains a high energy and high temperature state. At this time, the internal temperature also rises sharply. When a certain critical point is reached, the outer shell of the tin ball 3 in the first-stage gas arc extinguishing channel will melt, and then the internal SF6 inert gas will be ejected. The electric arc and gas enter the arc extinguishing chamber 5 of the first-stage gas arc extinguishing channel.

[0058] Step 3: An electric arc is a type of plasma in which positive and negative ions and neutral particles continuously undergo ionization and dissociation. An electric arc consists of three parts: the cathode region, the anode region, and the arc column region. The interaction of these three regions leads to arc discharge. Arc discharge is an extremely complex self-sustaining discharge. If it is not stopped, it will seriously threaten the safety of power lines. SF6 gas, as a highly electronegative gas, can effectively suppress this process, weaken the ionization process, and ultimately extinguish the arc.

[0059] Step 4: The multi-stage gas arc extinguishing channels are connected end to end. If the arc cannot be completely extinguished in the arc extinguishing chamber 5 of the first-stage gas arc extinguishing channel, it will enter the gas channel 2 of the next-stage gas arc extinguishing channel. At this time, the arc energy will still cause the temperature inside the pipe to rise. The SF6 gas in the solder ball 3 of the next-stage gas arc extinguishing channel is released and continues to interact with the arc in the arc extinguishing chamber 5 of the next-stage gas arc extinguishing channel. When the arc temperature drops to about 3000K, it is considered that the arc has been completely extinguished, the arc extinguishing process is over and there is no risk of reignition.

[0060] The Coulomb force in step 1 specifically works as follows: When the lightning current does not break down the gap, it generates an induced arc, forming an induced charge chain. This induced charge chain consists of many charges of the same polarity. The interaction of these arcs generates a significant Coulomb force. This Coulomb force exhibits an attraction-attraction effect on the outside, ensuring that the arc smoothly enters the arc-extinguishing lightning protection device of this invention. Furthermore, the Coulomb force acts as a pressure-breaking force on the arc, leading to a continuous increase in pressure within the channel. This increase in pressure simultaneously accelerates the arc's movement speed and raises the temperature within the gas channel. When the melting point of the tin ball 3's outer shell is reached, the next arc-extinguishing process begins.

[0061] Excellent insulation and arc-extinguishing properties of SF6 gas: Excellent insulation and arc-extinguishing properties of SF6 gas:

[0062] (1) The decomposition temperature of SF6 gas (2000K) is lower than that of air (mainly nitrogen, with a decomposition temperature of about 7000K), while the required decomposition energy (22.4eV) is higher than that of air. Therefore, it absorbs more energy during decomposition and has a stronger cooling effect on the arc column. Due to the decomposition of gas molecules, a peak in gas thermal conductivity appears at the corresponding decomposition temperature.

[0063] (2) SF6 decomposes into S atoms, F atoms, and positive and negative ions at high temperatures, exhibiting a higher degree of ionization compared to other arc-extinguishing media. Maintaining the same degree of ionization results in a lower arc column temperature. Consequently, the arc voltage in SF6 gas is also low, leading to a smaller arc energy during extinguishing, which is beneficial for arc extinguishing. Furthermore, SF6 retains high insulation strength after arcing. The fluorine and sulfur molecules in SF6 gas are tightly bonded together, requiring a significant release of energy to dissociate the SF6 gas into plasma via the arc. Once the arc energy is insufficient to dissociate the SF6 gas, the arc begins to extinguish, and the plasma quickly recombines back into SF6 gas. Therefore, SF6 gas extinguishes the arc through dissociation and recombination, demonstrating extremely strong arc-extinguishing capabilities. It is precisely these excellent properties of SF6 that ensure the smooth operation of the arc-extinguishing process in this device.

[0064] (3) Due to the strong electronegativity of SF6, it can adsorb electrons and recombine with positive ions, resulting in rapid recombination and strong deionization. Especially before and after the current crosses zero, it can reduce the number of charged particles in the arc gap and decrease the conductivity. The time constant of the SF6 gas arc is also very small, on the order of microseconds or even smaller. When the arc current crosses zero, the arc column temperature will drop sharply, and the decomposition products will recombine rapidly. Therefore, the dielectric strength and recovery speed of the SF6 arc gap are very high, and it can withstand a very high recovery voltage. The arc is not easy to reignite after the current crosses zero.

[0065] (4) The extinguishing principle of electric arc in SF6 gas is different from that in air and oil. It does not rely solely on the isentropic cooling effect formed by the pressure gradient of airflow, but mainly utilizes the unique thermochemical properties and strong electronegativity of SF6 gas, which gives SF6 gas a strong arc extinguishing ability.

[0066] A simplified model of the invention was simulated and analyzed. The simplified model diagram is shown below. Figure 3 As shown, this is a single-stage gas arc extinguishing channel model. In this simulation, the arc extinguishing situation after being introduced into the gas channel (2) is simulated. The simulation results are shown in the figure below. Figure 4-5 As shown.

[0067] Depend on Figure 4It can be seen that after the electric arc is subjected to the lightning electrode 1, it enters the gas channel 2. At this time, the inlet temperature of the gas channel 2 rises rapidly, reaching a maximum of about 9000K. Then, the high-temperature gas quickly fills the entire channel and acts on the solder ball 3 inside the channel. The solder ball 3 ejects SF6 gas. As the SF6 gas interacts with the electric arc, the temperature inside the channel gradually decreases, from 9000K at 50µs to about 6000K at 600µs, and then drops below 3000K at 3000µs. At this point, it can be considered that the electric arc has been completely extinguished. Furthermore, because the SF6 gas can withstand a very high recovery voltage, the possibility of the electric arc reigniting is extremely small, proving the effectiveness of the device in extinguishing arcs.

[0068] Depend on Figure 5 It can be seen that in the initial stage of arc extinguishing, the electric arc is drawn into the gas channel 2. At this time, the energy of the electric arc causes the internal air temperature to rise rapidly, resulting in an expansion effect. The air velocity at the arc extinguishing channel opening increases rapidly, reaching a speed of nearly 800 m / s, and moves inside the gas channel 2. When the solder ball 3 melts due to high temperature, the SF6 gas flows out and interacts with the electric arc in the gas channel 2. The internal temperature of the channel gradually decreases, and the internal airflow velocity also gradually decreases. At 3000 μs, the internal airflow velocity of the channel is almost 0. At this time, it can be determined that the electric arc has been completely extinguished.

[0069] The above is a simulation study of a simplified single-stage gas arc-extinguishing channel. To further determine the optimal model, a multi-stage gas arc-extinguishing channel was modeled and simulated. The changes in gas channel temperature and gas flow velocity during the arc-extinguishing process under different numbers of gas arc-extinguishing channels are as follows: Figure 4-5 As shown in the diagram. Analysis reveals that in a single-stage gas arc extinguishing channel structure, temperature and airflow velocity exhibit a brief upward trend during the decrease. However, as the number of gas arc extinguishing channel stages increases, the same time period will show a continuous downward trend. This is because the overall internal space of a single-stage gas arc extinguishing channel is relatively small, making it unable to extinguish the arc in time, resulting in delayed energy dissipation and heat accumulation due to the injection of power frequency energy. Therefore, a single-stage gas arc extinguishing channel is not the optimal structural design for this device. Further comparison shows that as the number of gas arc extinguishing channel stages increases, the overall arc extinguishing effect of the device improves to varying degrees. However, the improvement effect of a four-stage gas arc extinguishing channel compared to a three-stage gas arc extinguishing channel is minimal. Considering factors such as the production cost of the device, it is considered that the device is optimal when the number of gas arc extinguishing channel stages is 3 or 4. Therefore, in this invention, the gas arc extinguishing channel is set to 3-4 stages. This invention is mainly used for 35kV lines, where 3-stage and 4-stage gas arc extinguishing channels are the best, with 4-stage being more effective and 3-stage being slightly cheaper.

[0070] In summary, this invention rapidly extinguishes the electric arc, and the synergistic effect of multiple gas channels ensures that the arc can be completely extinguished, avoiding the possibility of arc reignition. This device is an improvement over traditional gas arc extinguishing devices that rely on compressed air. It extinguishes the arc through the chemical properties of SF6 itself, avoiding excessive pressure inside the device and reducing the possibility of the device exploding or breaking.

[0071] Those skilled in the art will recognize that the units of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of the invention.

[0072] In the embodiments provided in this application, it should be understood that the division of units is only a logical functional division. In actual implementation, there may be other division methods, such as multiple units can be combined into one unit, one unit can be split into multiple units, or some features can be ignored.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A novel arc-extinguishing and lightning protection device, characterized in that, It includes several gas arc extinguishing channels, an insulating layer (4), a lightning electrode (1), a grounding electrode (6), and a fixing part (7); The gas arc-extinguishing channels of several stages are connected end to end and interconnected, and the gas arc-extinguishing channels store sulfur hexafluoride gas for arc extinguishing; The insulating layer (4) is wrapped around the outside of the several stages of gas arc extinguishing channels; The lightning electrode (1) is fixed to the top of the insulating layer (4), with one end exposed outside the insulating layer (4) and the other end close to or extending into the first-stage gas arc extinguishing channel; The grounding electrode (6) is fixed to the bottom of the insulating layer (4), with one end exposed outside the insulating layer (4) and the other end extending into the last stage gas arc extinguishing channel; The fixing part (7) is fixedly connected to the bottom of the insulating layer (4); The gas arc extinguishing channel includes a gas channel (2), a solder ball (3), and an arc extinguishing chamber (5); The gas channel (2) is above the arc-extinguishing chamber (5) and is connected to the arc-extinguishing chamber (5). The inner diameter of the gas channel (2) is smaller than the inner diameter of the arc-extinguishing chamber (5). The solder ball (3) is placed inside the gas channel (2), and the outer diameter of the solder ball (3) is smaller than the inner diameter of the gas channel (2); the solder ball (3) stores sulfur hexafluoride gas inside; A solder ball support is provided on the inner wall of the gas channel (2) to support the solder ball (3) placed inside the gas channel (2). The solder ball support is a hollow structure.

2. The novel arc-extinguishing and lightning protection device according to claim 1, characterized in that, The inner wall of the gas channel (2) is a ceramic layer (11).

3. The novel arc-extinguishing and lightning protection device according to claim 1, characterized in that, The central axes of the gas channels (2) of two adjacent gas arc extinguishing channels are not on the same straight line.

4. The novel arc-extinguishing and lightning protection device according to claim 1, characterized in that, The end of the lightning electrode (1) that is close to or extends into the first-stage gas arc-extinguishing channel is a pointed end.

5. A novel arc-extinguishing and lightning protection device according to claim 1, characterized in that, The end of the grounding electrode (6) that extends into the last stage gas arc extinguishing channel is a pointed tip.

6. A novel arc-extinguishing and lightning protection device according to claim 1, characterized in that, The material used to make the lightning electrode (1) is graphite.

7. A novel arc-extinguishing and lightning protection device according to any one of claims 1-6, characterized in that, The gas arc extinguishing channel is configured with 3 or 4 levels.

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