CN2938340Y - Protection device for preventing lightning backflash - Google Patents

Protection device for preventing lightning backflash Download PDF

Info

Publication number
CN2938340Y
CN2938340Y CN 200620115493 CN200620115493U CN2938340Y CN 2938340 Y CN2938340 Y CN 2938340Y CN 200620115493 CN200620115493 CN 200620115493 CN 200620115493 U CN200620115493 U CN 200620115493U CN 2938340 Y CN2938340 Y CN 2938340Y
Authority
CN
China
Prior art keywords
lightning
thunder
electrode
metal
electric field
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN 200620115493
Other languages
Chinese (zh)
Inventor
刘秋成
钱昌发
孟旭旭
Original Assignee
刘秋成
钱昌发
孟旭旭
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 刘秋成, 钱昌发, 孟旭旭 filed Critical 刘秋成
Priority to CN 200620115493 priority Critical patent/CN2938340Y/en
Application granted granted Critical
Publication of CN2938340Y publication Critical patent/CN2938340Y/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

Disclosed is a protection device to prevent back flash when flightening, which refers to a lightening protection device. The utility model comprises a metal air electrode (1), a special resistive suppressor(2), a static screen loop(3), a mainstay(4). The metal air electrode is arranged at the upper side of the special resistive suppressor, and the static screen loop is arranged at the lower side of the special resistive suppressor. The mainstay impenetrates and fixes the metal air electrode, the special resistive suppressor, and the static screen loop together. The utility model mainly solves the problems existed in the current lightening protected devices.

Description

Anti-lightning backflash protective device
Technical field:
The utility model relates to a kind of lightning protection device.
Background technology:
Since ancient times, the thunder and lightning disaster exists always, and according to relevant research statistics, the earth takes up an official post when to carve on average has more than 2000 thunderstorm to take place, and average per second has lightning 100 times.Before more than 200 year, after U.S.'s scientist Franklin invention lightning rod, facilities such as building have obtained certain protection, it is believed that to prevent damage to crops caused by thunder, and the lightning protection problem is relaxed to some extent.Lightning rod is used till today, and its structure is made up of arrester, downlead and earth electrode, and its effect is by arrester interception lightning and by downlead and earth electrode lightning current to be dispersed into the earth,
The knowledge of electricity also only limits to electrostatics during Franklin invention lightning rod; the mankind do not answer electricity consumption as yet; lightning rod is used for the protection building with lightning conducter, the same of lighting proof strip; lightning rod comes down to attracting thunder needle; it can only replace being struck by lightning than its short protected target, therefore, does not cause counterattack for making it when being struck by lightning; must make their earth resistance drop to qualified numerical value, otherwise just not reach predetermined protection purpose.
20th century phone and the development of electric power caused new thunder calamity, shocking preventing technology obtains paying attention to and having had tremendous development.The seventies begins to adopt new shocking preventing technology abroad, this technology is not the passive thunder that draws, but initiatively remove the thunder that disappears, its product also begins to adopt in a large number this technology in " dissipation array " China's the late nineteen eighties, has caused the discussion that " thunder disappears " and " drawing thunder " two send expert's academic viewpoint thus.Finally go back imperfection in theory, in practice stumble several times and negated again with dissipation array.
The product that occurs a kind of active lightning rod that discharges in advance in recent years on the domestic market, it is said that this product can produce point discharge under the thundercloud state, make the lightning rod top form an artificial thunder and lightning guide who makes progress, like this, thundercloud is increased to the probability of this lightning rod discharge, be equivalent to increase lightning rod and strengthened protection radius; Because artificial guide's discharge takes place in advance, immature thundercloud is discharged in advance on the other hand, made the strength reduction of lightning like this.But it does not still break away from the notion of drawing thunder.
21 century has entered information-intensive society; the pulse electromagnetic field of lightning has been raised to first to the disaster of microelectronic component; except original building industry and electric power system need the lightning protection, many departments such as post and telecommunications now, petrochemical industry, Aero-Space also urgently feel to have needed lightning protection.Original lightning rod can't have been protected the safety of building, people and electric equipment.Original many industry and departments that the thunder and lightning disaster never takes place also are injured again and again.These damage to crops caused by thunder are that people are unexpected.
After the eighties, these new features that the thunder calamity occurs mainly are because the rise of some piles all can attract thunderbolt as high-rise intelligent building, antenna tower etc., thereby place building own and near building are destroyed.The various built on stilts long lead of setting up draws thunder enters the room, and makes lightning arrester ineffective.Along with the microelectric technique high development and be widely applied to every field, make the damage to crops caused by thunder object that transfer also take place, from the infringement of building itself being transferred to, so that human casualty accident takes place to indoor electrical equipment, the infringement of electronic equipment.
Summary of the invention:
The utility model has designed a kind of anti-lightning backflash protective device, and it has solved a lot of problems of existing lightning arrester.The utility model is made up of metal atmosphere electrode 1, special-purpose change resistance inhibitor 2, electrostatic screen ring 3, pillar 4, metal atmosphere electrode 1 is arranged on the special-purpose top that becomes resistance inhibitor 2, electrostatic screen ring 3 is arranged on the special-purpose below that becomes resistance inhibitor 2, and pillar 4 runs through metal atmosphere electrode 1, the special-purpose resistance inhibitor 2, electrostatic screen ring 3 of becoming to be fixed together.The utility model solves the deficiency of existing lightning arrester, mainly solves the deficiency of 4 aspects of lightning rod.1, lightning protection standard with building in public building lightning Protection Design standard (GB50057-94) chapter 2 is divided into three classes, wherein the direct striking thunder prevention measure of first kind lightning protection building is that independent lightning rod or overhead ground wire are set up in requirement, but in actual applications, independent lightning rod is difficult to accomplish real independence, because enter the various pipeline (water pipes of building, cable etc.), near the earthing device of lightning rod, pass possibly, so when the lightning rod thunderbolt, high potential can produce counterattack near metal object, subsequently thunder and lightning is introduced in the building, caused the thunder and lightning disaster.When 2, relying on the lightning rod direct striking thunder prevention qualified earth resistance must be arranged, when earthing device is made in the area of the high mountain station or soil resistivity very severe, want the earth resistance that reaches qualified, often investment is very huge, and the ground connection effect may not be satisfied with, and the earth potential counterattack phenomenon that causes owing to earth resistance is defective when thunderbolt is very serious.3, movable object such as command car, communication van, radar truck, guided missile truck etc. are owing to be at the volley, can't fine ground connection, even conventional lightning rod also can't be installed, earth resistance is defective if simple and easy lightning rod is installed, produce high voltage after being tantamount to draw thunder, all can damage equipment the people.4, behind the lightning rod of thunderbolt building, can produce very strong electromagnetic field around down conductor system, this magnetic field produces magnetic induction and damage equipment to contiguous plain conductor.When lightning current leaks into the earthing device of the earth, earth potential is raise, near metal pipe line or the earthing device that splits are formed counterattack, make the device damage that is connected with earthing device that these split.Its step voltage can also cause the people and get killed.
Description of drawings:
Fig. 1 is a structural representation of the present utility model, Fig. 2 is the ratio schematic diagram of using electric field and current density, Fig. 3 electrical block diagram of the present utility model, Fig. 4 are the discharge schematic diagrames of electric charge accumulation stage, loading electric charge stage, blocking-up stage, discharge regime, ending phase.
Embodiment:
Shown in Fig. 1-4, this embodiment is made up of metal atmosphere electrode 1, special-purpose change resistance inhibitor 2, electrostatic screen ring 3, pillar 4, metal atmosphere electrode 1 is arranged on the special-purpose top that becomes resistance inhibitor 2, electrostatic screen ring 3 is arranged on the special-purpose below that becomes resistance inhibitor 2, and pillar 4 runs through metal atmosphere electrode 1, the special-purpose resistance inhibitor 2, electrostatic screen ring 3 of becoming to be fixed together.Metal atmosphere electrode 1 is made by the high-quality Al alloy material, for the below electric charge provides one to assemble release areas, protected object is in the bottom played the effect of a shield.The special-purpose resistance inhibitor 2 that becomes plays the high-speed switch effect in whole system, when lightning induction is to metal atmosphere electrode, become the conducting of resistance inhibitor, charge inducing accumulates on the metal atmosphere electrode, during the approaching puncture of thunder and lightning guide and the interelectrode electric field of metal atmosphere air resistance critical value, become resistance inhibitor blocking-up and release electric charge rapidly, effectively suppress backflash and take place.Electrostatic screen ring 3 selects for use anticorrosive stainless steel material to make.When thundercloud when the protected object, between metal atmosphere electrode and protected object, play shielding action.Pillar 4 metal atmosphere electrodes, the special-purpose parts such as resistance inhibitor, electrostatic screen ring that become are linked as a unified integral body by pillar, and pillar selects for use anticorrosive stainless steel material to make.This embodiment solves the deficiency of existing lightning arrester, mainly solves the deficiency of 4 aspects of lightning rod.1, lightning protection standard with building in public building lightning Protection Design standard (GB50057-94) chapter 2 is divided into three classes, wherein the direct striking thunder prevention measure of first kind lightning protection building is that independent lightning rod or overhead ground wire are set up in requirement, but in actual applications, independent lightning rod is difficult to accomplish real independence, because enter the various pipeline (water pipes of building, cable etc.), near the earthing device of lightning rod, pass possibly, so when the lightning rod thunderbolt, high potential can produce counterattack near metal object, subsequently thunder and lightning is introduced in the building, caused the thunder and lightning disaster.When 2, relying on the lightning rod direct striking thunder prevention qualified earth resistance must be arranged, when earthing device is made in the area of the high mountain station or soil resistivity very severe, want the earth resistance that reaches qualified, often investment is very huge, and the ground connection effect may not be satisfied with, and the earth potential counterattack phenomenon that causes owing to earth resistance is defective when thunderbolt is very serious.3, movable object such as command car, communication van, radar truck, guided missile truck etc. are owing to be at the volley, can't fine ground connection, even conventional lightning rod also can't be installed, earth resistance is defective if simple and easy lightning rod is installed, produce high voltage after being tantamount to draw thunder, all can damage equipment the people.4, behind the lightning rod of thunderbolt building, can produce very strong electromagnetic field around down conductor system, this magnetic field produces magnetic induction and damage equipment to contiguous plain conductor.When lightning current leaks into the earthing device of the earth, earth potential is raise, near metal pipe line or the earthing device that splits are formed counterattack, make the device damage that is connected with earthing device that these split.Its step voltage can also cause the people and get killed.
Operation principle:
The important technological parameters of this embodiment
A) nominal voltage: 5KV
Voltage when becoming the resistance inhibitor and under electric field action, beginning to occur about 1A electric current.
B) nominal discharge current: 5KA
Thundercloud electric field over the ground becomes the discharging current of resistance inhibitor during in the 10KV left and right sides at the voltage of responding between atmosphere metal electrode and the electrostatic screen ring, promptly begins to load to the atmosphere metal electrode electric current of electric charge.
C) maximum discharge current: 65KA
Become the resistance inhibitor and load the maximum current capacity of electric charge to the atmosphere metal electrode.
D) energy absorption capability: 15KJ/KV
This is the permission electric energy when becoming the resistance inhibitor by electric current, represents with the KJ of every KV.
E) shielding angle is 50 °-70 °
The special-purpose resistance inhibitor operation principle that becomes:
The employed change of CPD lightning strike protection device prevents the system utensil that inherent, strong nonlinear V/I characteristic is arranged, and this characteristic makes the lightning-arrest product of making no electric spark clearance become possibility.This change resistance inhibitor is to be made by the zinc oxide material of high conduction performance and other metal material that mixes, and is embedded in the mould of being made by firm granular material.By the technical process of complexity, last and metal electrode is linked together.
Become resistance inhibitor characteristic curve and can be divided into three service areas.
As Fig. 2: A as shown in the figure: first service area is at 0.01mA/mm 2The left side of current density, rheostat is in blocking state, corresponding to a using electric field less than 1.8Kv/cm.
B shown in the figure: second service area is bordering on horizontal line at the middle section of curve, demonstrates the quick increase that will cause current density along with little electric field change, in this zone, played rheostatic effect by stratum granulosum.
C shown in the figure: the 3rd service area is positioned at above 10A/mm 2The zone of current density produces the performance of a linear resistance in fact again.
Anti-earth potential backflash equipment principle:
The Lei Nadi laboratory of Electricite De France finds that if place a big metal ball body below the high-field electrode in long air gap, then the guide discharges and often gets around Metal Ball and discharge over the ground.Spherical object has the effect of uniform electric field, and thunderbolt is airborne electrical breakdown, and electric field strength is mainly measuring that can air breakdown.Therefore the lightning risk size characterizes with the numerical value of electric field strength.Originate in the upward leader of ground object or descending guide arrive ground object behind the thunderbolt height on to meet the guide all be that to originate in those electric field strength the strongest, at first reach the body surface of the numerical value that punctures air.Electric Field Indensity on Surface of Conductor is proportional to the surface density of charge of conductive surface, so the surface charge surface density also just can characterize the size of lightning risk.Be struck by lightning easily so lightning rod needle point area is little, charge density is high, electric field strength is big.
If use a kind of spherical device; be installed in the peak in the regional area; with the guide's of thunder and lightning interaction under; the partial charge surface density is impaired within the safe range; disturb thunder and lightning to extend in the guiding protection zone earlier; stop the formation of thunder and lightning, effectively prevent from the protection zone, to form " backflash " phenomenon of lightning, just can make thunderstruck dangerous reduction of target at this zone main discharge channel.
Lightning-protecting engineering theory analysis (as Fig. 3)
When being able to overcome the impedance of air, the electric field strength between thundercloud and the ground will form a downward thunder and lightning guide.The thunder and lightning guide produces electric field during near ground CPD protector between cloud layer and ground, electric charge is assembled on metal atmosphere electrode.When electric field strength surpasses predetermined value between thunder and lightning guide and the earth; become the resistance inhibitor and under electric field action, become conducting state; the electrode of CPD is by earth connection and ground conducting; gather a large amount of and the opposite polarity electric charge of thunder and lightning guide on the metal atmosphere electrode; make that the power line of thundercloud electric field points to metal atmosphere electrode all the time in protected scope; the thunder and lightning guide further near metal atmosphere electrode reach thunderbolt apart from the time; therebetween air with breakdown (if change lightning rod into; " counterattack " will take place; the thunder and lightning guide develops into thunderbolt); become the resistance inhibitor and in the extremely short time, sport high-impedance state; electric charge on the metal atmosphere electrode overflows to the thunder and lightning guide under effect of electric field by air; electric current is that the hundreds of milliampere is to the hundreds of ampere; flow through the electric current that becomes the resistance inhibitor and be far smaller than the lightening pulse electric current; electric field strength between metal atmosphere electrode and thundercloud reduces, and effectively stops advancing and develop of thunder and lightning guide, avoids forming counterattack.Through after the above process, the state when metal atmosphere electrode and thunder and lightning guide get back to beginning again is ready to the intervention next time to thunder and lightning.CPD has suppressed the differentiation of thunderbolt effectively in this cyclic process.
Among the figure: the A=electric charge gathers the district
Rzno=ZNO resistance
Rx=has the rheostat of strong nonlinear characteristic
Cs=is equivalent to the lightning arrester of the equal capacity of Rx
Rt, the impedance of Lt=downlead and induction reactance
The Zt=earth resistance
The B=shading ring
For the physical principle of this device work is described, set following symbol and meaning:
Near Ke: the electric field strength the electrode
Ks: the electric field strength that becomes two interpolars of resistance inhibitor.
Kc: corresponding to the electric field value that becomes resistance inhibitor conducting state.
Kcs: form the needed electric field critical value of upwards being struck by lightning.
The process that intervention thunder and lightning guide is developed into thunderbolt can be divided into following five stages: (as Fig. 4)
A shown in Figure 4 is---the A stage: electric charge accumulation stage.
Along with the thunder and lightning guide of downward development during near metal atmosphere electrode, because the electric field electrostatic induction, can be at metal atmosphere electrode and become and hinder the electric charge that enrichment on the inhibitor metal electrode become opposite in sign.Ks<Kc became the resistance inhibitor and was high-impedance state this moment, and metal atmosphere electrode can be regarded electric slider over the ground as.
B shown in Figure 4 is---the B stage: load the electric charge stage.
The thunder and lightning guide further develops and makes Ks>Kc (3Kv/cm-5Kv/cm), and change group inhibitor becomes conductor, loads electric charge by earth lead from ground to metal atmosphere electrode, and at this moment, the electric charge on the electrode is positive charge entirely.
C shown in Figure 4 is---the C stage: blocking state.
Along with the thunder and lightning guide constantly near metal atmosphere electrode, electric field in its vicinity further increases, the injection of electric charge makes and becomes resistance inhibitor two ends electric field and weaken, and when Ks<Kc, becomes the resistance inhibitor and becomes high-impedance state.At this moment, the electric charge on the electrode plays the effect of " shield " to the object below it.
D shown in Figure 4 is---the D stage: discharge condition.
Because near electrode, electric field strength Ke continues to increase the thunder and lightning guide, reaches approaching all the time
During the Kcs value, above metal atmosphere electrode, produce corona discharge.Ke further increases, when Ke 〉=Kcs, if what use is lightning rod, and " counterattack " generation at this moment, the thunder and lightning guide has just developed into thunderbolt.But be in high-impedance state owing to become the resistance inhibitor, " counterattack " current path is not smooth under its effect, have only rising electron stream in a small amount to form, this discharge face is to the descending direction of thunder and lightning guide, its symbol and thunder and lightning guide's opposite in sign, with lightning current generation neutralization, suppress the generation of counterattack.
E shown in Figure 4 is---the E stage: ending phase.
It is the final stage that protection is intervened, and this moment, the electric charge of thunder and lightning guide discharge generation was eliminated, and the Ks value also will increase, and begins aforesaid duty cycle again.
CPD is returned to original state in protection each time again after intervening, and is ready to intervene next time.When moving to the thunder and lightning guide when descending that the quantity of electric charge of region of discharge is not enough to be blocked towards the thunder and lightning guide that advanced by zone of protection, this characteristic of intervening repeatedly is very important.
Use metal atmosphere electrode before corona and ascending current formation, to accumulate a considerable amount of electric charges.The raising of electric field is because the variation of charge inducing density causes near the metal electrode.Because high electric field region field width, the electric charge that leaves electrode can make electric field in the protection zone in a safe range.The capital equipment structural material
Consider the convenience of installing and using, the CPD product adopts whole small-sized integrated design.Top is metal atmosphere electrode, and is middle for built-in special-purpose rheostat, bottom is metallic shield ring and the support bar that is connected in one, and plan in the position of convenient observation the thunder and lightning counter to be installed, and is convenient to observe the result of use of protector.
Become the resistance inhibitor
Special-purpose change resistance inhibitor is the core component of CPD, according to the regulation of GB11032-2000 and IEC standard, requires rheostat to have outstanding nonlinear characteristic, and leakage current is less than 1 milliampere under normal voltage.When electric field strength increases, when voltage raises, raise by rapid rising of rheostatic electric current and then restriction rheostat both end voltage, when voltage reduced, rheostat returned to normal non-conductive state at once.
The used change resistance of CPD inhibitor aligns, negative electric field all has identical characteristic curve, and stability is high, does not almost have hysteresis; The energy that can dissipate fast and efficiently and produce by the joule effect.
Metal atmosphere electrode
Metal atmosphere electrode is being designed to half-oval shaped, requires its smooth surface and will reach maximum radius of curvature, to realize the effect of enrichment maximum amount of charge and uniform electric field, will consider the wind resistance and the corrosion resistance of metal atmosphere electrode simultaneously.By the metal atmosphere electrode that the high-quality Al alloy material is made, can be easy to realize processing, and characteristics such as in light weight, corrosion resistance height are arranged.
The electrostatic screen ring
Any lightning protection measures all might be slipped up, the electrostatic screen ring is to consider under the situation of single unit system lightning protection error, when strong lightning wave impulse, because internal-response is untimely or damage, high voltage can cause the outside to begin to take place flashover immediately, makes lightning current go into ground without rheostat from puncturing arc path, thereby has discharged internal pressure, certainly, this is not that we are desirable.
The electrostatic screen ring is the annulus of being made by stainless steel material, and his diameter equates with metal atmosphere electrode, holds together with support bar.

Claims (1)

1, a kind of anti-lightning backflash protective device; it is characterized in that it is made up of metal atmosphere electrode (1), the special-purpose resistance inhibitor (2), electrostatic screen ring (3), pillar (4) of becoming; metal atmosphere electrode (1) is arranged on the special-purpose top that becomes resistance inhibitor (2); electrostatic screen ring (3) is arranged on the special-purpose below that becomes resistance inhibitor (2), and pillar (4) runs through metal atmosphere electrode (1), the special-purpose resistance inhibitor (2), electrostatic screen ring (3) of becoming to be fixed together.
CN 200620115493 2006-05-18 2006-05-18 Protection device for preventing lightning backflash Expired - Fee Related CN2938340Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 200620115493 CN2938340Y (en) 2006-05-18 2006-05-18 Protection device for preventing lightning backflash

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200620115493 CN2938340Y (en) 2006-05-18 2006-05-18 Protection device for preventing lightning backflash

Publications (1)

Publication Number Publication Date
CN2938340Y true CN2938340Y (en) 2007-08-22

Family

ID=38362366

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200620115493 Expired - Fee Related CN2938340Y (en) 2006-05-18 2006-05-18 Protection device for preventing lightning backflash

Country Status (1)

Country Link
CN (1) CN2938340Y (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105119259A (en) * 2015-07-24 2015-12-02 中国石油化工股份有限公司 Direct lightning protection system
CN105305074A (en) * 2015-09-29 2016-02-03 成都中航信虹科技股份有限公司 Intelligent protection antenna
CN105745799A (en) * 2013-06-19 2016-07-06 Abb技术有限公司 Shroom-shaped high voltage electrode
CN110943425A (en) * 2019-12-24 2020-03-31 国网山东省电力公司临沂供电公司 Lightning arrester for electric power iron tower and use method thereof
CN112117661A (en) * 2020-08-04 2020-12-22 湖南中普技术股份有限公司 Lightweight method and device of anti-flashover lightning protection device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105745799A (en) * 2013-06-19 2016-07-06 Abb技术有限公司 Shroom-shaped high voltage electrode
CN105745799B (en) * 2013-06-19 2017-10-03 Abb技术有限公司 Mushroom-shaped high-field electrode
CN105119259A (en) * 2015-07-24 2015-12-02 中国石油化工股份有限公司 Direct lightning protection system
CN105305074A (en) * 2015-09-29 2016-02-03 成都中航信虹科技股份有限公司 Intelligent protection antenna
CN110943425A (en) * 2019-12-24 2020-03-31 国网山东省电力公司临沂供电公司 Lightning arrester for electric power iron tower and use method thereof
CN112117661A (en) * 2020-08-04 2020-12-22 湖南中普技术股份有限公司 Lightweight method and device of anti-flashover lightning protection device

Similar Documents

Publication Publication Date Title
CN102841280B (en) Method for simulating lightning trip-out rates of 500kV transmission line with four circuits on same tower
CN2938340Y (en) Protection device for preventing lightning backflash
CN202651618U (en) Predischarging current-limiting lightning rod
CN104779522A (en) Lightning dredger with insulator function
CN104518475A (en) Distribution network integrated lightning protection system
CN201307473Y (en) Lightning protector for 10 kV line
CN105140902A (en) External mobile type lighting protection system
CN209823107U (en) High-efficient lightning protection system of wind-powered electricity generation field
Djamel et al. Transient response of grounding systems under impulse lightning current
CN204884740U (en) Take 10kV circuit porcelain cross arm insulator lightning protection device of counter
CN203722054U (en) Anti-flash return shock protection apparatus
CN202034676U (en) Multifunctional lightning arrester
Wang et al. Study on the flashover characteristics of bird droppings along 110kV composite insulator
CN203260987U (en) High-voltage line lightning arrester
CN105071369A (en) Active direct lightning protection device
CN207265416U (en) A kind of 10kV exchanges overhead transmission line arc blowing type lightning protection device
Wen et al. Simulation Test Study on Influence of Grounding Resistance on Lightning Capability of Triggering Lightning Tower
CN203289052U (en) External column-type voltage limiter for overhead line insulated conductor
Cai et al. The lightning protection performance of the composite material cross-arm in 10 kV distribution lines
CN106448961A (en) 10kV overvoltage protection insulator
CN213424750U (en) Series multi-gap metal oxide arrester
CN102543335A (en) Composite insulated zinc oxide lightning arrester
CN201629493U (en) Large-protection angle protection device against direct lightning strike
CN212277622U (en) Lightning arrester
CN207380187U (en) One kind draws Reatta scale model lightning test system

Legal Events

Date Code Title Description
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20070822

Termination date: 20150518

EXPY Termination of patent right or utility model