Lightning is an old and mysterious science. Since human history, the history of people and lightning struggles have been recorded in each period. Since Franklin Franklin, 1706-1790, the atmosphere is studied, and the struggle of human beings has entered a new field with the struggle of lightning. After Franklin, modern industrialization began to develop, especially in the Russian engineer Dubroor (1862-1919) invented three-phase induction motor and transformer to achieve electric energy remote transmission; US Inventive Bell (1847-1922) invented the phone Later, human beings quickly entered the electrification era. At this time, the harm of lightning is mainly developed by the past, who is going to hit the lightning strikes, and is mainly transmitted by wire transmission. After a long-term study, people established the theory of sensor thunder and high voltage counterattack, and clarified the propagation law of high voltage lightning waves on the metal wire, invented the arrester with series gaps and fuses in 1890. In 1922, the US Western House Electric Company has successfully developed carbon-based silicon lightning, 1972 Japan Hitachi Company has successfully developed no clearance arrester, and the lightning protection science has been greatly developed. The high-voltage lightning protection technology is basically mature. Things are always like this: a contradiction is solved, and the other implies that the contradiction between the original contradiction is not attached to the main contradiction. After the 1970s, with the continuous development and improvement of world semiconductor integration technology, new contradictions were produced. Since the semiconductor integrated circuit is very fragile and cannot withstand overvoltage and overcurrent impact, the lightning strike disaster of intelligent weaknesses is significantly increased. Electronic computer network system, wired transmission communication system, microwave transmission communication system, industrial automation control system, etc., have a serious threat of serious threats with close relationships with human life. Weak electric lightning protection has become a new research area of the lightning protection industry. The advancement of industrialization and technology has enabled all kinds of high-rise buildings and special use buildings, such as spring bamboo shoots, which also puts a lot of new problems for lightning protection. "Electrostatic resistance", "electromagnetic interference", "heat island effect", etc. have to be further studied and resolved. For more than a decade, people have made unremitting efforts around these issues, and many new lightning protection theories have been proposed, and a large number of new lightning protection devices, equipment and materials have developed many new lightning protection technology, but these theories. , Technology and equipment are well promoted. Therefore, enhanced lightning protection awareness has become a concern of the whole society. In 1994, my country promulgated the new "Building Lightning Protection Design" GB 50057-1994, which refers to a large number of international standards, and has made a lot of revisions on the original norms, regardless of guiding ideology, technical requirements or technical measures. The above is in the international leading position, which also marks the attention of our country's attention. Second, the basic theory of lightning is a very destructive natural phenomenon, and its voltage can be as high as millions of volts, and the instant current can be more than 10,000 amps. For thousands of years, the damage caused by lightning can be described as countless. After the lightning thunder, there may be a dangerous overvoltage damage to the equipment in the range of 1.5-2km. Thunderstandings are like heavy rain, and the hurricane is the same as meteorological (natural) disasters, and it is known as water, drought, criminal offenses, and traffic accidents as six major disasters affecting social security and economic development. Thunder is generated in thunderstorms, and thunderstorms are often formed with strong convection weather, which is determined by atmospheric circulation and local meteorological factors. Thunderstorm is the discharge phenomenon generated between the clouds and clouds or clouds and the ground, and is accompanied by spark discharge, and the powerful current is passed, and the air is quickly expanded to produce huge sound, ie lightning. Lightning has a dendritic, sheet shape, strip-shaped, spherical, wherein the dendrites are most common. The energy of thunderstorms is supplied from the atmospheric unstable atmosphere that the solar radiation can be supplied. Every year, the solar radiation is enhanced. The instability in the atmosphere can increase. Because thunderstorms are initiated in spring, the summer, the sun is strong, and the atmosphere is not stable, and the thunderstorm is frequent.
After autumn and winter, the sun radiation is weakened, so thunderstorms gradually decrease. However, due to global climate change and atmospheric pollution, there is often a lightning strike in winter. It is reported that the strength of each lightning can be as high as 1 billion volts, and the power of a medium intensity thunderstorm is about 100,000 yuan, which is equivalent to an output power of a small nuclear power plant. In general, lightning disasters have the characteristics of sudden, diversity, complexity, destructiveness, and selectivity. With the rapid development of electronics technology - the rapid development of electronic technology and widely used, lightning disaster tracking, it also presents new features: the disaster is greatly expanded, especially easier to invade the closest field, loss and harm of high-tech The degree is greatly increased. To this end, the country has promulgated the "Meteorological Law of the People's Republic of China" in 1999; June 30, 2000, the "Measures for Lightning and Disaster Reduction Management" will be promulgated; this is for meteorological disasters including lightning disasters, protecting people's lives and property safety Promote economic and social sustainable development, will play an important role. In recent years, with a large number of data equipment and precision instruments applications, the accidents caused by lightning damage have increased year by year. Due to the high concentration of the internal structure of the communication computer network, the ability of the equipment is resistant to overvoltage and overcurrent, it is easier to suffer from lightning. Light can cause the interface damage of the computer terminal and the communication device to make the communication interruption, a lot of information loss or cannot be transferred; the weight makes the network host damage, resulting in network paralysis, and work cannot be performed. Computer network systems are easy to suffer from lightning strikes: Modem (modem), Router Switch (switch), HUB, NIC, communication card, UPS, computer power and motherboard. In terms of lightning disaster defense, there are more than two centuries, which has been developed from building lightning protection to power protection, electrical and electronic equipment lightning protection. Now it has entered the fourth stage, which is modern microelectronic equipment. Lightning protection. Lightning protection technology and products, as well as the development of modern high-tech development, except for the traditional lightning righteral intercept technology, there is a dispersion reduction, shield isolation, inhibitory and diversion, balance and other potentials, optimize ground discharge and lightning Controlling positioning warning and other techniques, and develops a variety of high-tech isolation devices, electronic arresters, high-efficiency anti-corrosion resistant and other equipment, devices and products, and devices and lightning detection and warning systems such as rocket and laser. Equipment, this has laid a technical and material foundation for effective defense to control lightning disasters. 1. The pathway of lightning strike intrusion equipment has two ways to have two ways: A. Direct lightning strikes: Raytariness or Lei Yun's rapid discharge phenomenon in a certain point in the ground is called direct lightning. The main destruction of direct lightning strikes is: buildings, field workbenses, forests, overhead distribution lines, human animals, etc. B. Sensing lightning strike: When thunder cloud is discharged, the electrostatic induction and electromagnetic induction generated on the vicinity of the nearby conductor is called the sensing lightning strike. Building a lightning needle can avoid lightning strikes to damage buildings, but lightning strikes from the top of the building from the top of the building into the earth or nearly light strikes, all metal items in the building. Instaled voltage, the high and low of these induced voltages varies with the metal shape, the distance between the ground, and the size of the lightning strike (according to the IEC1312 standard, when the shot is hitting the building, even if there is a lightning rod, about 50% lightning strike energy Still allocating the power system) Once your power input line, telephone line, network line, or other electronic equipment is introduced, the introduction line inductive high pressure, the lightning rod can be powerful. The main object of inductive lightning damage is electrical equipment.
C. Potential counterattack: external lightning protection system (such as lightning protection needle, lightning network, etc.) suffer from direct lightning, and at both ends of the ground resistance generate dangerous overvoltage, the ground wire of the equipment is introduced into the device, resulting in damage to the equipment. D. External lightning protection and internal lightning: lightning (or lightning needle, lightning network), lead the line and grounding system constitute external lightning protection systems, mainly to protect buildings from lightning strikes cause fire accidents and personal safety accidents; and internal lightning protection systems It is to prevent damage to lightning and other forms of overvoltage intrusion equipment. This is the external lightning protection system that cannot be guaranteed. In order to achieve internal lightning, there is a need to enter the cable, metal pipelines, etc. of various protected zones, and the electrical pipelines, etc. . 2, the basic principle of lightning strike protection, the so-called lightning protection is to introduce the energy of the lightning current as possible through reasonable and effective means, which is a gap, not blocking or mine. A complete lightning protection system includes two aspects: direct lightning protection and protection of lightning strikes. It is incomplete, defective and potentially dangerous. Principle of protective protection directly: Import the charge in Lei Yun with a conductor into the earth. It is simply that artificially creates a discharge path to Lei Yun, and does not allow the charge in Lei Yun to flow through the need to protect. The protected system directly lightning includes a light-thread, leading the line, and the ground part of the ground. Among them, the flash is mainly used as a lightning rod, lightning strap, lightning protection network, and the like. The norms that must be complied with the design and construction of the direct lightning protection system are the "Building Lightning Protection Design Specification" (GB50057-94). International foreign standards such as IEC, BS are generally consistent. Third, building lightning protection 1, the lightning protection measures of the first type of buildings are the first type of lightning protection building refers to: 1, manufacturing, use or storage: explosives, such as Black Sakkin, Specialray, Triitlanyl Brackic acid, etc.; gunpowder, such as single-based smokeless gunpowder, double base no fireworks, etc.; Such as minimal merc, aluminum nitride, etc .; fireworks, such as a letter of tribune, etc. 2. There are buildings with 0 districts or 10 district explosion environments. The 0 zone explosion environment refers to a place where an explosive mixture can be formed under normal conditions; the so-called 10 zone refers to the explosion risk of dust or fiber explosive mixture, which can form an explosive mixture under normal conditions. A, anti-straightforward measures: 1, the independent lightning rod or overhead lightning protection line (net) should be installed, which makes protected buildings and hoods that protrude from roofing of the roofs in the scope of light. 2. Emissions Explosive Hazardous Gas, steam or discharge tube, and the following space outside the nozzle of the breathing tube should be in the scope of the light of the light. 3, discharge explosive hazardous gas, steam or dried dispersing tube, breathing valve, etc. Ventilation tube, safety valve, and splitter protection range can only be protected from tube caps, and can only be protected to the pipe when there is no cap. 4, the rod tower of the independent lightning rod, the end of the end of the overhead lightning light and the split of the overhead lightning protection network should be set at least one lead. 5, the support of the independent lightning rod and overhead lightning protection line (web) and its grounding device to the protected building and the metal objects such as the protected building shall not be less than 3m. 6, overhead radiotear lines to the roof and various hoods that protrude the roof, the distance between the objects such as discharge pipe should not be less than 3m. 7. Independent lightning rod, overhead lightning or overhead lightning protection network should have a separate grounding device, and the impact ground resistance of each lead line should not be greater than 10Ω. B, anti-induced thunder measures: 1. Equipment, pipeline, frame, cable metal outer skin, etc., and highlight the metal objects that protrude, it should be connected to the grounding device of lightning protection inductance. The metal roof is grounded once every 18-24m. On-site reinforced concrete roofs, steel-based reinforced concrete, which is composed of prefabricated components, should be bind or welded into closed loops, and should be grounded once every 18-24m.
2, parallel laying pipes, architecture and cable metal outer skin, etc. When the net distance is less than 100 mm, the metal shutdown should be used, and the spacing of the cross-pipe should not be greater than 30m, and the cross-net net distance is less than 100m. join. When the elbow of the long metal, the transition resistance at the ligation of the valve, the flange plate is greater than 0.03 Ω, the connection is applied to the wire bridge. For flange dishes connected to 5 bolts, in a non-corrosive environment, it may not be bridged. 3. The grounding device of lightning protection should be shared and the electrical equipment grounding device is shared, and the working electrical resistance should not be greater than 10 Ω. The grounding trunk and lightning protection inductance should not be less than two. C, anti-wire invasive measures: 1, low pressure lines should be used through metal armored cable or general plastic outer skin cable to wear metal tube directly, and the metal outer skin of the cable should be connected to lightning protection. The induced grounding device. When there is difficulty in using a cable in the whole line, a reinforced concrete rod and an overhead line can be used, and a metal armor-like cable or sheath cable is used directly into the steel pipe, and the buried length should not be less than 15m. At the cable and overhead connection, there is still a lightning arrester. Arrester, cable metal outer skin, steel pipe and insulator iron foot, gold machine, etc. should be grounded together, and its impact ground resistance should not be greater than 10Ω. 2, overhead metal pipes, in addition to the building, should be connected to the grounding apparatus of the lightningirectional inductance. The pipelines within 100m of the building should be grounded once every 25m, and the impact ground resistance should not be greater than 20Ω, and it is advisable to use the welding of metal brackets or reinforced concrete brackets. G. The metal pipes in the buried or ditch should also be connected to the grounding device of the lightning protection inductance at the entry and exit building. D, special circumstances: When the building is too high or other reasons, it is difficult to install independent lightning rod, overhead lightning lightning, lightning protection network, can reduce the lightning rod or mesh not more than 5m × 5m or 6m × 4m lightning network or by Its mixed-formed spinner is directly installed on the building, and the lightning protection network should be laid in the hoggy, the eaves, etc. Requirements: 1. All lightning needles should be connected to each other by lightning. 2, the lead line should not be less than two, and should be uniform or symmetrical along the building, and the spacing should not be greater than 12 meters. 3, the object should be installed with average rings, and the vertical distance between the loop should not be greater than 12m, all lead, the metal structure and metal equipment of the building should be connected to the ring. Average rings or ground dry lines of electrical equipment. 4, the grounding device of anti-straight thunder should be laid around the building into a ring-shaped ground body, and each of the impact ground resistances of the line should not be greater than 10 Ω, and should be connected to the electrical equipment grounding device and all metal pipes entering the building. Device or use of lightning protection inductance. 5, when the building is higher than 30m, the following anti-side measures should be taken: (1) From 30m, it is consistent with a horizontal lightning strap around the building and connected to the underside to prevent the light. (2) 30m and above the railings of the outer wall, the large metal objects such as doors and windows are connected to the lightning protection device to prevent lightning attacks. 6. The main distribution box introduced in the power supply should be equipped with a lightning arrester. 2. Lightning protection measures for second types of buildings: 1. Buildings in national key cultural relics protection. 2, national holiday halls, office buildings, large exhibition buildings, large railway stations, large-scale water pump houses, etc. are particularly important. 3. National Calculation Center, International Communication Hub, etc. It is important to have a large number of buildings with large number of electronic equipment. 4, manufacturing, use or storage of explosive buildings, while electric sparks are not easy to explode or do not cause huge damage and personal casualties. 5. Building a zone explosion hazardous environment, while electric sparks are not easy to cause explosions or do not cause huge damage and personal casualties. 6, buildings with a dangerous environment of the explosion of the zone or 11 district. 7. The industrial enterprise has an explosion-free open-air steel closed gas tank.
8. It is expected that the number of lightning strikes is greater than 0.06 times / A, provincial office buildings and other important or unopened public buildings; 9, expected to be more than 0.3 times / A of the residential, office building and other general civil buildings . The so-called 11 zone explosion hazardous environment means that the dust mixture will occur and accidentally occurring the dust in the accumulation. The building of the explosion dangerous environment in the zone refers to the normal case where it is not possible, but the place where an explosive mixture can be formed under abnormal conditions. The 2 district explosion hazardous venue refers to the environment where an explosive mixture cannot occur under normal circumstances, or the environment of the explosive mixture that occurs shortly. A, anti-straightness measures: highlight the hazardous gas, vapor or dust discharge pipe, respiratory valve, exhaust pipe and other pipes, breathing valve, exhaust pipe: (1) The metal object can not be attached, but the roof Lightning device is connected. (2) Non-metallic objects other than the scope of the roofing spinner should be loaded with the light and connected to the roof lightning device. B. Measures for anti-induced thunders: Measures of anti-induced thunders should meet the following requirements: 1. Main metal products such as equipment, pipes, architecture, etc., should be close to anti-straight hitting device or electrical equipment protection grounding device On, the grounding device can be installed. 2, parallel laying pipes, architecture and cable metal outer skin, etc. For the first type of building, it is necessary to prevent the thunder, but it can be eliminated. 3. The connection of the grounding trunk and the grounding device induced by the building should not be less than two. B. Measures to prevent induced thunder: When the full length of the low voltage line is introduced with a burying cable or the cable is laid in the overhead metal wire, the metal outer skin and metal wire groove should be grounded; the height exceeds 45m Special provisions of two types of lightning protection buildings: steel tender structure, steel structure, steel structure, and equipotential of steel structures, and steel structures, steel structures, steel structures, should be adopted: 1. Steel frame and concrete steel should be connected to each other. 2, the steel column or column steel should be used as the lightning line. 3, there should be larger metal products such as 45m and above the outer wall, door and window, etc. 4, the vertical laid metal pipe and the top and bottom ends of the metal object are connected to the lightning device. 3. Lightning protection measures for third types of lightning protection buildings: Third type buildings refer to: 1. Buildings and provincial archives of provincial key cultural relics protection. 2, the number of lightning strips is expected to be greater than or equal to 0.012 times / A, and less than or equal to 0.06 times / A, provincial office construction and other important or unsettled public buildings. 3. The general civil buildings such as the number of missions are expected to be greater than 0.06 times / A, and less than or equal to 0.3 times / A. 4. The number of light strikes is expected to be greater than or equal to 0.06 times / A General industrial building. 5. According to the influence of industrial production and the consequences of industrial production, the fire hazardous environment of the 21st, 22 districts, and 23 regions requiring lightning lines is determined by factors such as industrial production. 6, the average thunderstorm day is more than 15d / A, heights of chimneys, water towers, etc., water towers, etc., water tower, etc., and all-in-ranks are less than or equal to 15D / A, the height is 20m and above the chimney, water tower. Other independent towering buildings; A, anti-straightforward measures: 1, it is advisable to use lightning protection nets (bands), lightning rods, or spinners made of these two mixing. Lightning network (with) should be laid in the area of the righteousness of the roof, the roof and the corner. It should be more than 20m × 20m or 24m × 16m mesh. 3, the building of the flat roof, when the width is not more than 20m, it can be laid along the periphery. The impact ground resistance of each lead is not greater than 30Ω, but the number of lightning strips is greater than or equal to 0.12 times / A, and less than or equal to 0.06 times / A, provincial office buildings and other important or unstoptable buildings should not be greater than 10Ω. Its grounding apparatus should be shared with grounding apparatuses such as electrical equipment. The grounding device of the lightning light is preferably connected to the buried metal pipe. When no coincidence is injured, when it is not connected, the distance between the two should not be less than 2m.
In the case where the shared grounding device is preferably connected to the buried metal pipe, the grounding device should be laid around the building. 2, the item should be used as a refurbished concrete roof, beam, column, and base steel bau as a spinner, lead the line and grounding device. When the base uses silicate cement and the surrounding soil water content is not less than 4% and its foundation When there is no anti-corrosion layer or asphal, there is a preservative layer or asphalte, it is advisable to use a steel bar as a grounding device. It should not be less than 10 mm in the concrete, and the diameter should not be less than 10 mm, and the steel bar is connected to the concrete member in the concrete member, and the total cross-sectional area should not be less than one diameter. The cross-sectional area of 10mm steel bars. There is a steel or mesh-shaped steel bar connected to the member, the connection between the brangles and the steel bars, the connection of steel bars and steel bars should be connected or welded using the binding method of civil construction. Single steel or round steel or outer buddle connecting plate, the connection of the wire and the steel bar should be welded or connected to a bolt fastened card. An electrical passage must be attached between the components. 3, chimney, reinforced concrete chimney, suitable for mineral or lightning rock protection on the chimney. The multi-protothelite needle should be connected to the closed ring. When the non-metallic chimney cannot be protected by a single or double mineral protection, a ring lightning strap should be installed in the chimney, and the three-high-tech non-light righteral needle is arranged. When two or more chimneys are together, even when calculating the high chimney protection range can cover low chimneys, the low chimney still needs to install anti-straight shot. Reinforced concrete chimneys should be connected to metal climbs at the top and bottom of their top and bottom. The height of no more than 40m is not more than 40m, and it can only be taken away from the line, and two leads should be set at more than 40 m. A metal ladder that can be used for bolt or welding can be used as two leads. Metal chimneys should be used as a spinner and pilot line. The building of the building is not less than two, but buildings that are not more than 25m per length of more than 25m and the height of not more than 40m can only provide a line. The line should be uniform or symmetrical along the building, and the spacing should not be greater than 25m, and when only steel columns or column steel bars of the building are taken as a lead line, the line can be applied to the lower line, but the line is removed The average spacing should not be greater than 25m. B, anti-induced thunder measures: 1. On the cable input and export, the electrical equipment such as the metal outer skin, steel pipe should be grounded in the input and exit. When the cable is changed to an overhead line, the arrester should be installed at the transfer. The grounding end of the arrester, the cable metal outer skin and the insulator iron feet should be grounded together, and the impact ground resistance should not be greater than 30Ω. 2, low pressure frame air input line, should be protected from the outlets and iron foot and the insulator, and the gold load is connected to the grounding device of the electrical equipment. When multi-circuit overhead input line, a set of arresses or other types of overvoltage protector can be installed only in the bus or total distribution box, but the insulator is iron foot, and the gold load should be connected to the grounding device. 3, the overhead metal pipe of the building, on the grounding apparatus of the lightning light or electrical equipment, which should be proceeds or independently, and its impact ground resistance is not more than 30 Ω. 4, other provisions of building lightning protection: 1. When there is a lightning protection building, the first, second, three types of lightning protection buildings: 1, the area of the first type of lightning building accounts for the total building When the area is 30% and above, the building should be identified as the first type of lightning protection building. 2, when the area of the first type of lightning building accounts for 30% and below the total area of the building, and the area of the second type of lightning building accounts for 30% and above the total area of the building, or these two The area of the lightning protection building is less than 30% of the total building area, but the area is more than 30%, the building should be identified as a second type of lightning protection building. However, the protection of lightning protection and lightning protection of the first type of building part should take the protection measures of the first type of lightning protection building. 3, when the area of the first and second types of lightning protection buildings is less than 30% of the total building area, and it is impossible to be directly lightning, the building can be determined as the third type of lightning protection building, but First, the lightning protection and electric wave invasion of the second type of building part should be adopted to adopt a protective measures to add lightning protection buildings. It is advisable to take lightning protection measures according to their respective categories when they are subject to direct lightning strikes.
Second, the lightning protection requirements for the maintenance of the road, aviation disorder signal lights, and other electric equipment: 1, electric equipment without metal casings or protective net cover is preferably within the scope of protection of the spinner. It is not advisable to be protected from lightning protection networks. 2. Wear steel pipes from the lines taken from the distribution plate. One end of the steel pipe should be connected to the distribution plate housing, the other end is connected to the shell, and the protective cover is connected, and it is advisable to connect to the roof lightning device. When the insulating pad of the steel aerospace connection, it is advised to set a cross-wiring when the conductive is poor. 4. In the distribution plate, it is advisable to set a voltage protector between the power supply side of the switch and the housing. Fourth, new technologies for lightning protection 1. When the laser beam thunder device laser beam passes through air, if the laser is intense, it is possible to generate an ionization along the air of the beam path, thereby increasing the conductivity of the channel. Take this to direct lightning. As the controllability of the laser beam is good, it is ideal as a means of active cutons or thunder. Second, the rocket thunder This is a mature approach at present. That is, the traction of a wire with a small rocket is directly emitted to the Lei Yun. However, since the lightning strike of artificially triggered is "ripe" lightning strike, the magnitude of the recorded thunder current is relatively low. It is currently used in the study of lightning parameters, which is used to lightning the price of too high. Third, the water column thunder The US Navy has triggered lightning strikes. According to this idea, the existing people use high pressure water guns. The water column thunder is relatively low, but the water column is limited. Researchers are studying the shape of improving the nozzle and use pulse pressurized methods to increase the water column. Fourth, the radioactive rod pin is preloaded on the end of the clamping device, so that the air is ionization thereby increasing the interception rate. The supplier of lightning rods is known that the effectiveness of the radiopae is greatly improved due to the radiocar end portion of the lightning rod. But in fact, theoretical analysis description, such radioactive isotope is only in the range of approximately centimeters from the ionization of Alpha particles, so it is meaningless to "increased lightning rod height". The comparative trial in the laboratory showed that there was no significant difference in the probability of the same height of ordinary lightning rod and radioactivity needle. V. Surrounded righteners with architecture insulated from the structure of the towering architecture or facilities (such as the launch of the space shuttle, the military antenna, microwave tower, etc.), and some use independent lightning rod protection. Some directly mount the lightning rod (or the terminals of the flash) on the protected architecture. In order to exempt the display of the shinner and the protected objects to be brought together in electrical, the shinner is separated from the protected architecture with the protected architecture. The shinkener is alone with a plurality of plurality of multi-lanes. Sixth, the scaner is a lightning protection device that is completely opposite to the routine interceptive lights, that is, try to "refuse the door outside". The Rena Lab of French Power Company has found that a large metal sphere is placed below the high voltage electrode in the long air gap, the first conductive discharge often discharges the metal ball. The so-called passive miners are to use this phenomenon, so that the protected electric field is evenly as possible to avoid being protected. 7. The manufacturer of murderer introduces it is a device that uses natural electric field to generate corona current to inhibit Thunder Clouds, so that the device that does not occur on the ground. If the performance of this device is reliable, it will fundamentally eliminate the thunder. 8. Active lightning protection needle According to the manufacturer, this product can absorb energy with atmospheric electric field. When the stored energy reaches a certain degree, it will be discharged from the tip of the lightning needle, and the tip is surrounded by air ionization, and the lightning rod is formed. Upward lightning guide, it is more early than the natural upward lightning passage to contact Lei Yun downwards, forming a main discharge channel. In this way, the probability of discharge of Thunder is increased to the ratio of the lightning rod, which is equivalent to the protection range of the lightning rod, or is equivalent to adding the lightning rod. According to the manufacturer, due to the issuance of artificial pilots, it is equivalent to the height of the lightning needle to rise by 3 to 6 times; The intensity is weakened.
