CN102709814A - Annular parallel gap lightning protection device for overhead line insulator string - Google Patents
Annular parallel gap lightning protection device for overhead line insulator string Download PDFInfo
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- CN102709814A CN102709814A CN2012101216678A CN201210121667A CN102709814A CN 102709814 A CN102709814 A CN 102709814A CN 2012101216678 A CN2012101216678 A CN 2012101216678A CN 201210121667 A CN201210121667 A CN 201210121667A CN 102709814 A CN102709814 A CN 102709814A
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- 239000012212 insulator Substances 0.000 title claims abstract description 62
- 239000002184 metal Substances 0.000 claims abstract description 48
- 229910052751 metal Inorganic materials 0.000 claims abstract description 48
- 230000005540 biological transmission Effects 0.000 claims description 51
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 5
- 239000010962 carbon steel Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 21
- 230000005684 electric field Effects 0.000 description 18
- 238000009826 distribution Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 10
- 238000009413 insulation Methods 0.000 description 9
- 238000010891 electric arc Methods 0.000 description 5
- 210000003205 muscle Anatomy 0.000 description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 4
- 239000010931 gold Substances 0.000 description 4
- 229910052737 gold Inorganic materials 0.000 description 4
- 208000025274 Lightning injury Diseases 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
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Abstract
An annular parallel gap lightning protection device for an overhead line insulator string belongs to the technical field of lightning protection devices for overhead lines. The device is a pair of metal electrodes connected in parallel at two ends of an overhead line insulator string, and each metal electrode mainly comprises an annular electrode, a rod-shaped electrode, an L-shaped connecting rod and a metal clamp. The invention has the dual functions of parallel gap and equalizing ring, and the weight is light; the components are standardized, the universality is strong, and the installation is convenient; the distance between the parallel gaps is convenient to adjust, and the lightning protection device can be used for lightning protection of overhead lines with different voltage classes and has strong practicability; wide application range and the like. The invention can be widely applied to the lightning protection of overhead lines with different voltage grades in an electric power system.
Description
Technical field
The invention belongs to the lightning protection device technical field of power overhead network, be specifically related to the additional lightning protection device of overhead transmission line lightning protection.
Background technology
The lightning stroke trip fault of overhead transmission line is a difficult problem that influences countries in the world power grid security power supply.Current damage to crops caused by thunder accident still accounts for very big proportion in all tripping operation accidents of circuit, particularly bigger at southern area proportion.Show 110kV in 2008 and above transmission line caused by lightning strike 650 times, the line is busy the road always trips 62.3% of number of times according to Guangdong Power Grid line thunder protection service data; Japan's 50% above power system accident is owing to transmission line of lightning strike causes.Lightning fault often causes line insulation to destroy, and causes power outage, has also brought harmful effect to resident living and industrial and agricultural production when causing direct economic loss to power department.Therefore, the lightning protection of enhancing overhead transmission line is one of important measures that guarantee the power system safety and stability operation.
Because lightning outage rate is the important indicator of China's examination electric power netting safe running; The overhead transmission line lightning protection measure that present China is adopted mainly is based on " obstruction " type lightning protection; Promptly improve the lightning withstand level of circuit as much as possible, reduce tripping rate with lightning strike.Common lightning protection measures comprises and sets up lightning conducter, reduces pole tower ground resistance, reinforced insulation, installs coupling ground wire additional, leakage conductor etc. is installed.See that from the operating experience of decades " obstruction " type lightning protection is being brought into play huge effect really, but aerial power transmission line still exists certain tripping rate with lightning strike and rate of failure, some areas are also quite high, and lightning stroke flashover has caused a large amount of insulators to damage.Along with China's electrical network is fast-developing in recent years; Grid structure is more and more stronger; And the generally use of a large amount of SF6 switches, microcomputer relaying protection and reclosing device, further develop economical and practical, the overhead transmission line lightning protection device is necessary efficiently.
The parallel connection gaps lightning protection device of " dredging " type connects the sudden strain of a muscle thunder discharge because of having, shifts and dredge power frequency arc, even three kinds of functions of power frequency electric field; And be widely used as the additional lightning protection measure of overhead transmission line, in order to strengthen the lightning protection of overhead transmission line.The parallel connection gaps lightning protection device of existing overhead transmission line insulator string; The notification number of bulletin was the patent of CN2687923Y " overhead transmission line parallel connection gaps lightning protection device " like on March 23rd, 2005; Disclosed parallel connection gaps lightning protection device; Be in the two ends of overhead transmission line insulator string parallel connection pair of metal electrodes (being ground connection lateral electrode and lead lateral electrode), when being used for the 110kV overhead transmission line, the outer end of lead lateral electrode is spherical; When being used for the 220kV overhead transmission line, the outer end of lead lateral electrode is the branch type electrode.The major defect of this device is: 1. this parallel connection gaps lightning protection device variety of components is many, is unfavorable for standardized production; 2. this parallel connection gaps lightning protection device has only considered that parallel connection gaps connects the function of dodging thunder discharge and dredging power frequency arc, thereby is only applicable to the lightning protection of 110kV and 220kV overhead transmission line.
Summary of the invention
The present invention seeks to deficiency, a kind of annular parallel connection gaps lightning protection device of overhead transmission line insulator string is provided to existing overhead transmission line insulator string parallel connection gaps lightning protection device.Should " dredging " type lightning protection device have simple in structure, element standardization, be convenient to produce in batches, easy for installation, be applicable to characteristics such as high-tension overhead line.
The technical scheme that realizes the object of the invention is: a kind of annular parallel connection gaps lightning protection device of overhead transmission line insulator string is in the insulator string two ends of overhead transmission line parallel connection pair of metal electrodes.It is characterized in that: a metal electrode of said pair of metal electrodes is mainly connected rod and metal fixture etc. and is formed by an annular electrode, clavate electrode, " L " shape.
Said annular electrode, clavate electrode and " L " shape connect the carbon steel metal bar that rod is diameter 15 ~ 20mm.
Described annular electrode is the metal bar opening annulus of internal diameter 300 ~ 400mm.Described " L " shape of welding connects rod on a side end face of the annular annular electrode opening part of open circles; So that the parallelly connected electrode of described annular is fixedly connected on the metalwork end of overhead transmission line insulator string one end; The annular electrode of open circles annular prevents that in order near the Electric Field Distribution the even overhead transmission line insulator string metalwork metalwork from producing corona.On the opposite side end face of the annular annular electrode opening part of open circles; Through the affixed described clavate electrode of metal fixture (being buckle); So that regulate the angle between said clavate electrode and the said annular electrode; In order to the spacing (being the short circuit distance of thunder discharge) of regulating overhead transmission line insulator string parallel connection gaps, in order to connect the sudden strain of a muscle thunder discharge.
Described clavate electrode is that end length spherical in shape is the metal bar of 200 ~ 400mm, and the diameter that said clavate electrode one end is spherical is 40 ~ 50mm, in order to the burning of tolerance large-current electric arc.
Described " L " shape connects the long 10mm ~ 50mm of being of excellent vertical bars, the long 300mm ~ 400mm of being of horizon bar.The termination that said " L " shape connects excellent vertical bars is welded on the side end face of said annular electrode opening part; The termination that said " L " shape connects excellent horizon bar is fixed on the insulator string one end metalwork of overhead transmission line through metal fixture (being the rhombus buckle), screw and nut, is fixed in an end place of the insulator string of overhead transmission line in order to the metal electrode that is made up of said annular electrode and said clavate electrode.
Described pair of metal electrodes; " L " shape through a described annular electrode connects the horizon bar of rod and the insulator string two ends that metal fixture (rhombus buckle), screw and nut are fixed in overhead transmission line symmetrically respectively, and the spacing of a pair of clavate electrode spheric end of pair of metal electrodes is 750mm ~ 3780mm.
After the present invention adopts technique scheme, mainly contain following effect:
1) loop configuration of the present invention can have been improved the Electric Field Distribution of insulator string end well.Than existing clavate parallel connection gaps, annular parallel connection gaps structure of the present invention has the ability of uniform insulation substring end electric field better, prevents that gold utensil from producing corona, thus the insulator string of protection circuit effectively.
2) each metal electrode of annular parallel connection gaps of the present invention is made up of an annular electrode and a clavate electrode; Existing parallel connection gaps connects the sudden strain of a muscle thunder and lightning and puts function a little; Play the effect of " dredging " electric arc, the ability of uniform insulation substring end electric field is arranged again, also alleviated the whole heavy burden of insulator string; Practical, have wide range of applications;
3) clavate structure of the present invention is regulated the angle between clavate electrode and the annular electrode through metal fixture (being buckle); To regulate the spacing of parallel connection gaps; And, make the present invention easy for installation, and be applicable to the lightning protection of multiple different electric pressure overhead transmission lines through snap fit;
4) element design standardization, easily manufactured, highly versatile.
The present invention can be adaptable across the lightning protection of different electric pressure overhead transmission lines in the electric power system.
Description of drawings
Fig. 1 is the structure chart that is installed on this aspect device of overhead transmission line insulator string;
Fig. 2 is the vertical view of annular electrode among Fig. 1;
Fig. 3 is the structure chart that connects gold utensil among Fig. 1;
Fig. 4 is the voltage-time curve figure of 220kV overhead transmission line insulator string;
Among the figure: the voltage-time curve of a 220kV insulator string, b are installed the insulator string voltage-time curve of 1744mm annular parallel connection gaps;
The key wiring diagram of Fig. 5 power frequency arc arcing test;
Fig. 6 is the voltage distribution map of 220kV overhead transmission line insulator string;
Among the figure, c insulator string Electric Field Distribution curve, d are installed the insulator string Electric Field Distribution curve of annular parallel connection gaps, and e installs the insulator string Electric Field Distribution curve of clavate parallel connection gaps;
Fig. 7 is the distribution map of the electric field of 220kV overhead transmission line insulator string;
Among the figure, f installs the insulator voltage distribution curve of annular parallel connection gaps, and g installs the insulator voltage distribution curve of grading ring
Among the figure: 1 insulator string, 2 annular electrodes, 3 clavate electrodes, 4 metal fixtures, 5 " L " shape connects rod, 6 nuts, 7 screws, the fuse of 8 simulation electric arcs, the test of 9 arcings is used insulator string, 10 analog conducting wires, 11 experiment power supplies, 12 disconnecting links, 13 switches.
Embodiment
Below in conjunction with embodiment, further specify the present invention:
Shown in Fig. 1 ~ 3, a kind of annular parallel connection gaps lightning protection device that is used for the overhead transmission line insulator string of 110kV is the two ends parallel connection pair of metal electrodes at the insulator string 1 of overhead transmission line.It is characterized in that: a metal electrode in the said pair of metal electrodes mainly connects rod 5 and metal fixture 4 etc. by an annular electrode 2, clavate electrode 3, " L " shape and forms.
Said annular electrode 2, clavate electrode 3 and " L " shape connect the carbon steel metal bar that rod 5 is diameter 15mm.
The metal bar opening annulus that said annular electrode 2 is internal diameter 300mm.Described " L " shape of welding connects rod 5 on a side end face of annular annular electrode 2 opening parts of open circles; So that the parallelly connected electrode of described annular is fixedly connected on the metalwork end of overhead transmission line insulator string one end; The annular electrode 2 of open circles annular prevents that in order near the Electric Field Distribution the metalwork of even overhead transmission line insulator string 1 metalwork from producing corona.On the opposite side end face of annular annular electrode 2 opening parts of open circles; Through metal fixture (being buckle) affixed one described clavate electrode; So that regulate the angle between said clavate electrode 3 and the said annular electrode 2; In order to the spacing (being the short circuit distance of thunder discharge) of insulator string 1 parallel connection gaps of regulating overhead transmission line, in order to connect the sudden strain of a muscle thunder discharge.
Said clavate electrode 3 is that end length spherical in shape is the metal bar of 200mm, and the diameter that 3 one ends of said clavate electrode are spherical is 40mm, in order to the burning of tolerance large-current electric arc.
The long 10mm of being of vertical bars, horizon bar length that described " L " shape connects rod 5 are 300mm.The vertical bars termination that said " L " shape connects rod 5 is welded on the side end face of said annular electrode 2 opening parts; The horizon bar termination that said " L " shape connects rod is fixed on the metalwork of overhead transmission line insulator string 1 one ends through metal fixture 4 (being the rhombus buckle) and screw, nut, is fixed in an end place of the insulator string 1 of overhead transmission line in order to the metal electrode that is made up of said annular electrode 2 and said clavate electrode 3.
Described pair of metal electrodes; " L " shape through a said annular electrode 2 connects horizon bar and metal fixture 4 (rhombus buckle) and the screw of rod, the two ends that nut is fixed in overhead transmission line insulator string 1 symmetrically respectively, and the spacing of a pair of clavate electrode 3 spheric ends of pair of metal electrodes is 750mm.
A kind of annular parallel connection gaps lightning protection device that is used for the overhead transmission line insulator string of 220kV, with embodiment 1, wherein:
Said annular electrode 2, clavate electrode 3 and connect the carbon steel metal bar that rod 5 is diameter 18mm; The metal bar opening annulus that described annular electrode 2 is internal diameter 350mm; Described end clavate electrode 3 length spherical in shape are 300mm; The spherical diameter of said clavate electrode 3 is 45mm, and " L " shape connects the long 30mm of being of vertical bars of rod 5, and horizon bar length is 350mm.
The spherical spacing in clavate electrode 3 ends of parallel connection gaps is 1744mm.
Embodiment 3
A kind of annular parallel connection gaps lightning protection device that is used for the overhead transmission line insulator string of 220kV, with embodiment 1, wherein:
Said annular electrode 2, clavate electrode 3 and connect the carbon steel metal bar that rod 5 is diameter 20mm; The metal bar opening annulus that described annular electrode 2 is internal diameter 400mm; Described end clavate electrode 3 length spherical in shape are 400mm; The spherical diameter of said clavate electrode 3 is 50mm, and " L " shape connects the long 50mm of being of vertical bars of rod 5, and horizon bar length is 400mm.
The spherical spacing in clavate electrode 3 ends of parallel connection gaps is 3780mm.
Result of the test
Overhead transmission line annular parallel connection gaps lightning protection device with embodiment 2, carry out following test:
1) 50% lightning impulse discharge test
This test is that can whether the lightning impulse discharge occurs between the parallel connection gaps end, locate the power frequency arc path effectively after annular parallel connection gaps was installed at check insulator string two ends.
Through experimental observation, the basic fixed position of lightning wave flashover path has the better linearity relation in the end of parallel connection gaps test product between clearance distance and the discharge voltage value; Through the requirement that tripping rate with lightning strike satisfies engineering that calculates to test data.
2) lightning impulse voltage-second characteristic test
Purpose is that research lightning impulse wave steepness changes for the flashover voltage of annular parallel connection gaps and the influence of discharge time.According to the insulation coordination principle of insulator string and annular parallel connection gaps, can know that from the Lightning Characteristic test parallel connection gaps has played the better protect effect to insulator string, as shown in Figure 4.
3) switching impulse flashover property test
This test is in order to check insulator string to install after the parallel connection gaps; Influence for circuit integral insulation level; The minimum operation impulse flashover voltage of parallel connection gaps must be higher than the issuable switching overvoltage amplitude of circuit, could guarantee to install the requirement of the horizontal coincidence circuit insulation of integral insulation of circuit behind the parallel connection gaps.The maximum switching impulse overvoltage of 220kV circuit is 620kV, but according to the requirement of the equal coincidence circuit insulation of the annular parallel connection gaps sample in the result of the test knowledge capital literary composition.
4) power frequency arc arcing attribute testing
This test is in order to verify that can the power frequency continued flow electric arc arc root behind the lightning stroke flashover float to the parallel connection gaps cigarette burning away from insulator string, and just parallel connection gaps leads the effect that arc, striking ability and protection insulator string avoid burning.
The layout plan of power frequency arc arcing attribute testing is seen Fig. 5.Little electric current arcing test short circuit current 1kA, duration 0.5s; Because the restriction of equipment, big electric current arcing test amplitude of short circuit is 17.75kA, and the duration is 0.2s.
Write down the process of testing arc motion in the testing ground with the high-speed camera appearance.The result shows that electric arc arc root away from insulator string, can effectively protect insulator string to avoid the power frequency arc calcination with fast speeds behind the installation parallel connection gaps.
5) voltage of overhead transmission line band parallel connection gaps distributes and electric Field Calculation
In order to study annular parallel connection gaps for the voltage of overhead transmission line insulator string and the influence of Electric Field Distribution; The superiority of outstanding annular parallel connection gaps contrast clavate parallel connection gaps; Prove the feasibility that annular parallel connection gaps replaces grading ring simultaneously, this paper has carried out calculating for the insulator string that various gold utensils are installed carefully.
The 220kV line insulator string is installed distribution map of the electric field such as the Fig. 6 and shown in Figure 7 behind three kinds of different protection gold utensils; The insulator axial electric field maximum in band shape gap is 3.006kV/cm, is 3.264kV/cm less than the insulator axial electric field maximum of being with grading ring.Can know according to result of the test; All the pressing performance even surpassed all pressures effect of general grading ring of annular parallel connection gaps; The all pressures performance that has surmounted the clavate parallel connection gaps greatly; Annular parallel connection gaps is described, and good lightning protection performance has concurrently evenly equally, the effect of electric field shielding except having, even can substitute the effect of grading ring for insulator string.
Realized connecing the sudden strain of a muscle thunder discharge, shifted and dredge power frequency arc, even three kinds of functions of power frequency electric field from the present invention of analysis of experiments, and realized all pressures effect for the insulator string power frequency electric field; The insulating requirements that has good lightning protection effect and coincidence circuit for overhead transmission line.
Claims (1)
1. the annular parallel connection gaps lightning protection device of an overhead transmission line insulator string; Each metal electrode that it is characterized in that the insulator string that is connected in parallel on overhead transmission line (1) the two ends pair of metal electrodes of said device mainly is made up of an annular electrode (2), a clavate electrode (3), connection rod (5) and metal fixture (4);
Said annular electrode (2), clavate electrode (3) and " L " shape connect the carbon steel metal bar that rod (5) is diameter 15 ~ 20mm;
Described annular electrode (2) is the metal bar opening annulus of internal diameter 300 ~ 400mm; On annular electrode (2) opening part one side end face of open circles annular; Weld one described " L " shape and connect rod (5), on the opposite side end face of annular annular electrode (2) opening part of open circles, through metal fixture; Be buckle, an affixed described clavate electrode (3);
Described clavate electrode (3) is that end length spherical in shape is the metal bar of 200 ~ 400mm, and the spherical diameter of said clavate electrode (3) one ends is 40 ~ 50mm;
The long 10mm ~ 50mm of being of vertical bars, horizon bar length that described " L " shape connects rod (5) are 300mm ~ 400mm; The vertical bars termination that said " L " shape connects rod (5) is welded on the side end face of said annular electrode (2) opening part; Said " L " shape connects the horizon bar termination of rod (5) through metal fixture (4); Be the rhombus buckle, screw and nut are fixed on the metalwork of insulator string one end of overhead transmission line;
Described pair of metal electrodes; The horizon bar and the metal fixture (4) that connect rod (5) respectively through " L " shape of a described annular electrode (2); It is the rhombus buckle; Screw and nut are fixed in the two ends of the insulator string (1) of overhead transmission line symmetrically, and the spacing of a pair of clavate electrode (3) spheric end of pair of metal electrodes is 750mm ~ 3780mm.
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Cited By (8)
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| CN103368075A (en) * | 2013-07-16 | 2013-10-23 | 王巨丰 | Different-voltage-class subsection arc-extinguishing anti-thunder gap device |
| CN104242212A (en) * | 2013-06-20 | 2014-12-24 | 国家电网公司 | Comprehensive lightning protection device for power transmission line |
| CN104517692A (en) * | 2015-01-09 | 2015-04-15 | 重庆西鹏防雷电子有限公司 | Parallel gap lightning protection device |
| CN104600570A (en) * | 2015-02-05 | 2015-05-06 | 张立 | Lightning arrester terminal |
| CN105409074A (en) * | 2014-04-30 | 2016-03-16 | 西美雷电气公司 | Discharging screen |
| CN106849045A (en) * | 2017-03-03 | 2017-06-13 | 中国电力工程顾问集团西南电力设计院有限公司 | The selection method of high voltage single-core cable sheath protector parallel connection gaps |
| CN107230534A (en) * | 2017-07-20 | 2017-10-03 | 云南电网有限责任公司电力科学研究院 | A kind of 220kV single ball-type parallel connection clearance devices used for transmission line |
| CN113300345A (en) * | 2021-06-15 | 2021-08-24 | 长沙理工大学 | Method and structure for adjusting insulation difference between single-phase parallel gap-added 10kV line and equipment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242212A (en) * | 2013-06-20 | 2014-12-24 | 国家电网公司 | Comprehensive lightning protection device for power transmission line |
| CN103368075A (en) * | 2013-07-16 | 2013-10-23 | 王巨丰 | Different-voltage-class subsection arc-extinguishing anti-thunder gap device |
| CN105409074A (en) * | 2014-04-30 | 2016-03-16 | 西美雷电气公司 | Discharging screen |
| CN104517692A (en) * | 2015-01-09 | 2015-04-15 | 重庆西鹏防雷电子有限公司 | Parallel gap lightning protection device |
| CN104517692B (en) * | 2015-01-09 | 2016-08-17 | 重庆西鹏防雷电子有限公司 | Parallel gap lightning protection device |
| CN104600570A (en) * | 2015-02-05 | 2015-05-06 | 张立 | Lightning arrester terminal |
| CN106849045A (en) * | 2017-03-03 | 2017-06-13 | 中国电力工程顾问集团西南电力设计院有限公司 | The selection method of high voltage single-core cable sheath protector parallel connection gaps |
| CN107230534A (en) * | 2017-07-20 | 2017-10-03 | 云南电网有限责任公司电力科学研究院 | A kind of 220kV single ball-type parallel connection clearance devices used for transmission line |
| CN113300345A (en) * | 2021-06-15 | 2021-08-24 | 长沙理工大学 | Method and structure for adjusting insulation difference between single-phase parallel gap-added 10kV line and equipment |
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| CN102709814B (en) | 2013-09-18 |
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