CN2687923Y - Overhead circuit parallel gap lightning protection device - Google Patents
Overhead circuit parallel gap lightning protection device Download PDFInfo
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- CN2687923Y CN2687923Y CN 200420001291 CN200420001291U CN2687923Y CN 2687923 Y CN2687923 Y CN 2687923Y CN 200420001291 CN200420001291 CN 200420001291 CN 200420001291 U CN200420001291 U CN 200420001291U CN 2687923 Y CN2687923 Y CN 2687923Y
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Abstract
The utility model relates to a lightning-prevention protection device for parallel gaps of an overhead circuit, which comprises an insulator string (2), a grounding side electrode and a conducting wire side electrode (6, 7), wherein the grounding side electrode and the conducting wire side electrode are connected to both ends of the insulator string. A protection gap which takes air as an insulating medium and is connected in parallel with the insulator string is formed between the grounding side electrode and the conducting wire side electrode; the length (Z) of the protection gap is less than the string length (Z0) of the insulator string; thus, when the overhead circuit is stricken by lightning, a discharging passage is formed among parallel gaps. The parallel gaps formed by the grounding side electrode and the conducting wire side electrode are connected with a grounding side and a circuit side of the insulator string to make the grounding side and the circuit side respectively have same electric potential. When the overhead circuit is stricken by lightning, the protection gap firstly discharges. The parallel gap device designed by the utility model has the advantages of simple structure and convenient installation; the material and the diameter of the electrodes can bear the burning of large electric arcs for many times.
Description
Technical field
The utility model relates to a kind of lightning protection device that is used for power overhead network, in particular for the lightning protection device of 110kV, 220kV power overhead network.
Background technology
The aerial power transmission line lightning protection is the problem that work about electric power person makes great efforts to inquire into always.In recent years, the fault that is caused by thunder and lightning in the electrical network still accounts for significant proportion, comprises that the power frequency continued flow behind the lightning stroke flashover damages insulator and gold utensil thereof, causes line accident.Lightning fault remains one of key factor that influences power grid security.
The existing lightning protection measures of aerial power transmission line, as set up lightning conducter, reduction pole tower ground resistance, reinforced insulation etc., its core concept is to improve the lightning withstand level of circuit as much as possible, reduces tripping rate with lightning strike.These lightning protection measuress can reduce " obstruction type " lightning protection mode.For the actual conditions of China's early stage electrical network rack weakness, (oil) switch performance difference, it is suitable that lightning protection adopts aforesaid way.In recent years, China's electrical network fast development, grid structure is more and more stronger; Along with technological progress, transformer station uses the SF6 switch in a large number, the relaying protection microcomputerization; reclosing device obtains generally to use; provide advantageous conditions for developing new lightning protection mode, seemed conservative and unilateral if still only continue to use original lightning protection mode this moment.In addition, the mode of Transmission Line Arrestor is installed, cost is very high, can not generally adopt.
The utility model content
For when overhead transmission line is struck by lightning, the protection insulator is avoided the calcination of power frequency continued flow electric arc, the utility model proposes a kind of overhead transmission line parallel connection gaps lightning protection device.
The utility model is at the actual conditions of China 110kV, 220kV overhead transmission line; carry out a large amount of groping property tests, designed multiple overhead transmission line parallel connection gaps lightning protection device and the installation gold utensil that can be used for suspension insulator (porcelain, glass) and strain insulator string.After having carried out great deal of experimental and calculation analysis work, make it the design seriation of practicability, through engineering approaches and product, so that can select the size of parallel connection gaps on the engineering according to insulator string sheet number and anti-thunder index.Secondly, being connected between parallel connection gaps part and the insulator string, also convenient, practical as far as possible, and satisfy requirement to size.
According to the utility model; a kind of overhead transmission line parallel connection gaps lightning protection device is provided; wherein; this parallel connection gaps lightning protection device comprises insulator string and ground connection lateral electrode; the lead lateral electrode; described ground connection lateral electrode; the lead lateral electrode is connected described insulator string two ends; and in described ground connection lateral electrode; constitute between the lead lateral electrode with the air be dielectric and with the series-parallel protection of described insulator gap; and make that the length in described protection gap is long less than the string of described insulator string; thereby when described overhead transmission line is struck by lightning, form discharge channel in the described parallel connection gaps.
Overhead transmission line parallel connection gaps lightning protection device of the present utility model is to connect pair of metal electrodes (claiming arcing horn/arc leading angle again) at the insulator string two ends, just constituted between the electrode with the air be insulant and with the series-parallel protection of insulator gap.The length in protection gap is long less than the string of insulator string, thereby its lightning impulse discharge voltage is lower than the discharge voltage of insulator string.When overhead transmission line is struck by lightning; to at first discharge in the protection gap; the power frequency arc that continues is under electric power and thermal stress effect; by the formed discharge channel of parallel connection gaps; be directed to electrode tip; be fixed on the electrode tip and burn, and finally blow open along electrode tip, burn thereby the protection insulator avoids electric arc by electric power.
The core of " parallel connection gaps lightning protection " this Lightning Protection is to allow circuit that certain tripping rate with lightning strike is arranged, but reclosing can be successful, no permanent fault.In parallel by the gap of adopting ground connection lateral electrode, lead lateral electrode to form with insulator string, connect and dodge thunder and lightning and dredge power frequency arc.
Parallel connection gaps and the ground connection side of insulator string and connecting of line side that ground connection lateral electrode, lead lateral electrode form make them have identical current potential respectively, and when overhead transmission line is struck by lightning, will at first discharge in the protection gap.The parallel connection gaps lightning protection device of the utility model design is simple in structure, easy for installation, and electrode material and diameter can tolerate the repeatedly calcination of large-current electric arc.From the several angles of know-why, economy and market capacity, adopting parallel connection gaps is that the strong of existing lightning protection measure replenished as the lightning protection measure of aerial power transmission line, and wide application prospect is arranged.
Description of drawings
Fig. 1 is the shape assumption diagram of 110kV overhead transmission line suspension insulator parallel connection gaps lightning protection device;
Fig. 2 A and Fig. 2 B are respectively the schematic diagram and the assembly drawings thereof of the ground connection lateral electrode of 110kV overhead transmission line suspension insulator parallel connection gaps lightning protection device;
Fig. 3 is the schematic diagram of the 110kV lead lateral electrode of conjuncted structure;
Fig. 4 is the schematic diagram of the 110kV lead lateral electrode of branch body structure;
Fig. 5 is the shape assumption diagram of 220kV overhead transmission line suspension insulator parallel connection gaps lightning protection device;
Fig. 6 is the schematic diagram of the 220kV lead lateral electrode of conjuncted structure;
Fig. 7 is the schematic diagram of the 220kV lead lateral electrode of branch body structure;
Fig. 8 is the shape assumption diagram of overhead transmission line strain insulator string parallel connection gaps lightning protection device;
Fig. 9 is the schematic diagram of the lead lateral electrode of 110kV strain insulator string;
Figure 10 is the schematic diagram of 220kV strain insulator string lead lateral electrode;
Figure 11 is the layout plan of 50% lightning impulse discharge test; And
Figure 12 is a power frequency arc test layout plan.
Embodiment
Describe parallel connection gaps lightning protection device of the present utility model in detail below in conjunction with accompanying drawing, wherein same or analogous parts are represented with same or analogous label.
Fig. 1 is the shape assumption diagram of 110kV overhead transmission line suspension insulator parallel connection gaps lightning protection device, and wherein insulator string 2 is according to the design of 110kV overhead transmission line, forms the string length Z of insulator string 2 by the porcelain or the series connection of glass suspension insulator of different sheet numbers
0Expression.The material of ground connection lateral electrode 6 and lead lateral electrode 7 is the Q235 structural carbon steel, and the steel rod diameter M of ground connection lateral electrode, lead lateral electrode is between 13-25mm.Ground connection lateral electrode 6 is formed and is fixed on symmetrically the both sides of insulator string 2 by the identical two parts of shape, the inner end of wherein every partial earthing lateral electrode is connected with the ball-eye 1 of insulator string 2 ground connection sides, the outer end of ground connection lateral electrode 6 (promptly, end away from insulator string 2) represents with Xc that to the distance of insulator string center line the height of ground connection lateral electrode 6 short circuit insulator strings is represented with Yc.Beeline between ground connection lateral electrode, the lead lateral electrode promptly protects the length in gap to represent with Z.
For fear of the relative motion between ground connection lateral electrode 6 and the ball-eye 1, the Cross section Design diamondwise at ball-eye 1 middle part, shown in Fig. 2 B, the corresponding with it link of ground connection lateral electrode 6 also is designed to corresponding shape.The outer end of ground connection lateral electrode 6 upwarps slightly, upwarps radian and is represented by R1, and shown in Fig. 2 A, the ground connection lateral electrode that goes out shown in this Fig is called pin type ground connection lateral electrode.
Return Fig. 1 again, lead lateral electrode 7 itself is the left-right symmetric shape, and its middle part is connected by yoke plate 4 and insulator string 2 bowls 3 and suspension clamp 5 in lead 8 sides.The outer end of lead lateral electrode 7 represents with Xp that to the distance of insulator string center line the height of lead lateral electrode short circuit insulator string is represented with Yp.
Fig. 3 is the 110kV lead lateral electrode schematic diagram of employed conjuncted structure among Fig. 1, and Fig. 4 is the 110kV lead lateral electrode schematic diagram of employed minute body structure among Fig. 1.Wherein, the outer end of 110kV lead lateral electrode is designed to sphere, and sphere diameter r is about 20-40mm.
Fig. 5 is the shape assumption diagram of 220kV overhead transmission line suspension insulator parallel connection gaps lightning protection device, and wherein insulator string 2 is according to the design of 220kV overhead transmission line.Because its structure is substantially similar to the 110kV overhead transmission line parallel connection gaps lightning protection device described among Fig. 1, therefore, save the detailed description of same or similar part wherein at this.Because the shape of the outer end of lead lateral electrode 7 is different with electric pressure, the lead lateral electrode 7 of this 220kV overhead transmission line parallel connection gaps lightning protection device have with Fig. 1 in different shapes.
Fig. 6 and Fig. 7 have specifically illustrated among Fig. 5 employed conjuncted structure respectively and have divided the schematic diagram of the 220kV lead lateral electrode of body structure, and wherein, the outer end of the lead lateral electrode 7 of 220kV overhead transmission line parallel connection gaps lightning protection device divaricates.The included angle A of two forks is not more than 90 degree, and the length b of bifurcated approximately is the 1/2-1/3 of Xp.Gap of top harvest, gap apart from d between 25-35mm.
Fig. 8 is the shape assumption diagram (being example with overhead transmission line strain insulator double insulator string specifically among the figure) of overhead transmission line strain insulator string parallel connection gaps lightning protection device; wherein insulator string 2 is according to the design of 110kV and 220kV overhead transmission line; porcelain or the series connection of glass suspension insulator by different sheet numbers form, and the string length of insulator string 2 is represented with Z0.The strain insulator string of overhead transmission line is that level is installed, and ground connection side and lead lateral electrode are in sustained height.The material of ground connection lateral electrode 6 and lead lateral electrode 7 is the Q235 structural carbon steel, and the steel rod diameter M of electrode is between 13-25mm.Ground connection lateral electrode 6 and lead lateral electrode 7 are all used the branch body structure and only are positioned at the top of insulator string, and its inner end is connected in the insulator string two ends by the identical yoke plate 4 of shape respectively.The outer end of ground connection lateral electrode 6 represents with Xc that to the distance of insulator string center line the height of ground connection lateral electrode 6 short circuit insulator strings is represented with Yc.The outer end of lead lateral electrode 7 represents with Xp that to the distance of insulator string center line the height of lead lateral electrode short circuit insulator string is represented with Yp.Beeline between ground connection lateral electrode, the lead lateral electrode promptly protects the length in gap to represent with Z.
The outer end of ground connection lateral electrode 6 upwarps slightly, upwarps radian and is represented by R1, shown in Fig. 2 A.
Fig. 9 is the schematic diagram of employed 110kV strain insulator string lead lateral electrode among Fig. 8.Wherein, the outer end of lead lateral electrode is designed to sphere, and sphere diameter r is about 20-40mm.
Figure 10 is an employed 220kV strain insulator string lead lateral electrode schematic diagram among Fig. 8.Because the shape of the outer end of lead lateral electrode 7 is different with electric pressure, 220kV strain insulator string lead lateral electrode 7 have with Fig. 9 in different shapes, wherein, the outer end of lead lateral electrode 7 divaricates.The included angle A of two forks is not more than 90 degree, and the length b of bifurcated approximately is the 1/2-1/3 of Xp.Gap of top harvest, gap apart from d between 25-35mm.
Although below specifically described overhead transmission line parallel connection gaps lightning protection device of the present utility model with reference to the accompanying drawings; but one of ordinary skill in the art will appreciate that the change that also can specific embodiment wherein not broken away from the utility model principle; for example; ground connection lateral electrode among Fig. 1 is made of two parts symmetrical; but the ground connection lateral electrode also can be only be made of wherein a part; this moment, the lead lateral electrode was also used the form of a corresponding part; as long as in the ground connection lateral electrode; constituting with the air between the lead lateral electrode is the protection gap of dielectric, and makes the length in described protection gap get final product less than the string of described insulator string is long.Simultaneously also can the parallel connection gaps that constitute between limit phase ground connection lateral electrode, the lead lateral electrode be contained in the outside of lead according to the actual track needs.
In addition; although 110kV has above-mentioned different shape and combination with the lead lateral electrode of 220kV overhead transmission line parallel connection gaps lightning protection device; but above-mentioned parallel connection gaps lightning protection device is formed by insulator string and ground connection lateral electrode, lead lateral electrode; ground connection lateral electrode, lead lateral electrode are connected described insulator string two ends; and between ground connection lateral electrode, lead lateral electrode, constitute with the air be dielectric and with the series-parallel protection of described insulator gap, and make that the length in described protection gap is long less than the string of described insulator string.Thereby its lightning impulse discharge voltage is lower than the discharge voltage of insulator string, and when overhead transmission line is struck by lightning, will at first discharge in the protection gap, burns thereby the protection insulator avoids electric arc.
In foregoing description of the present utility model, the dimensional requirement of ground connection lateral electrode is expressed as X
C, Y
C, the dimensional requirement of lead lateral electrode is expressed as X
P, Y
PX
CFor the distance of ground connection lateral electrode outer end to the insulator string center line, between 300-500mm, Y
CThe height of ground connection lateral electrode short circuit insulator string, it is no more than 500mm.X
PFor the distance of lead lateral electrode outer end to the insulator string center line, between 300-500mm, Y
PBe the height of lead lateral electrode short circuit insulator string, it is no more than 500mm.Beeline between the upper conductor lateral electrode promptly protects the length in gap to represent with Z, makes Z=Z
0-(Y
C+ Y
P).Y
C, Y
PSize, i.e. ground connection side and the lead lateral electrode height of short circuit insulator string respectively should be according to the actual number of insulator string and the tripping rate with lightning strike index of expection, and adjusts to determine by lightning impulse discharge test and trip-out rate.
As previously mentioned, because the protection gap length Z less than the string long Z
0, when overhead transmission line is struck by lightning, the protection gap will be at first breakdown.But for fear of because of the installing parallel connection gaps cause lightning outage rate to increase considerably, Z/Z
0Generally should be less than 75%.By the electrode of this principle design, Y
C, Y
PSize generally be no more than 500mm.In the overhead transmission line suspension insulator, above-mentioned ground connection lateral electrode, lead lateral electrode are installed to be parallel mode with lead usually, and the lead lateral electrode is symmetrical conjuncted structure, as Fig. 3 and shown in Figure 6; Sometimes according to the needs of actual track, the ground connection lateral electrode of limit phase, lead lateral electrode will be contained in the outside of lead, roughly vertical with lead direction mode is installed, this moment, lead lateral electrode and ground connection lateral electrode were half of conjuncted structure, as Fig. 4 and shown in Figure 7, the difference of this mounting means is, the connecting plate of itself and insulator string and wire clamp is perpendicular to electrode, and other size and dimension is all identical.
Further specify the implementation result of overhead transmission line parallel connection gaps lightning protection device of the present utility model below by concrete experiment.
1. 50% lightning impulse discharge test
This test is in order to check under the lightning impulse effect, and whether can flashover all on parallel connection gaps, locate the power frequency arc path effectively.
The layout plan of 50% lightning impulse discharge test is seen Figure 11.Each parts is respectively among the figure: impulse voltage generator G, oscilloscope S, RC divider D, simulation cross-arm H, parallel connection gaps B.
Result of the test shows that the discharge of 50% lightning impulse all occurs on the parallel connection gaps, by the tripping rate with lightning strike that calculates of test data being satisfied the requirement of engineering.Test and result of calculation see Table 1 and table 2.
Table 1 110kV electric pressure lightning impulse voltage (U50) and tripping rate with lightning strike
| Sequence number | Gap Z mm | U50(kV) | Trip-out rate (inferior/hundred kilometer year) | |||||||
| Calculated value | Test value | Differ % | The Plain | The mountain area | ||||||
| Calculate | Test | ％ | Calculate | Test | ％ | |||||
| 1 | 900 | 539 | 547 | -1.46 | 1.20 | 1.18 | 1.69 | 1.68 | 1.65 | 1.82 |
| 2 | 970 | 576 | 572 | 0.70 | 1.10 | 1.11 | -0.90 | 1.54 | 1.56 | 1.28 |
| 3 | 1040 | 614 | 610 | 0.66 | 1.01 | 1.02 | -0.98 | 1.42 | 1.43 | -0.70 |
| 4 | 1112 | 653 | 657 | -0.61 | 0.93 | 0.92 | 1.09 | 1.30 | 1.29 | 0.78 |
| 5 | 1190 | 695 | 666 | 4.35 | 0.84 | 0.90 | -6.67 | 1.19 | 1.27 | -6.30 |
| 6 | 1260 | 732 | 729 | 0.41 | 0.77 | 0.78 | -1.28 | 1.10 | 1.11 | -0.90 |
Table 2 220kV electric pressure lightning impulse voltage (U50) and tripping rate with lightning strike
| Sequence number | Gap Z mm | U50(kV) | Trip-out rate (inferior/hundred kilometer year) | |||||||
| Calculated value | Test value | Differ % | The Plain | The mountain area | ||||||
| Calculate | Test | ％ | Calculate | Test | ％ | |||||
| 1 | 1758 | 1038 | 1063 | -2.35 | 0.36 | 0.34 | 5.88 | 0.60 | 0.57 | 5.26 |
| 2 | 1863 | 1095 | 1087 | 0.74 | 0.32 | 0.33 | -3.03 | 0.53 | 0.54 | -1.85 |
| 3 | 1925 | 1130 | 1069 | 5.71 | 0.30 | 0.34 | -11.7 6 | 0.50 | 0.56 | -10.7 1 |
| 4 | 1975 | 1157 | 1118 | 3.49 | 0.28 | 0.31 | -9.68 | 0.47 | 0.51 | -7.84 |
| 5 | 2075 | 1212 | 1262 | -3.96 | 0.25 | 0.22 | 13.64 | 0.42 | 0.38 | 10.53 |
| 6 | 2170 | 1265 | 1278 | -1.02 | 0.22 | 0.22 | 0 | 0.38 | 0.37 | 2.70 |
2. power frequency arc test
Can this test be to burn in order to check power frequency continued flow electric arc arc root behind the lightning stroke flashover be fixed on (or transferring to) parallel connection gaps, i.e. the striking ability of shunting means, striking speed and the protection insulator effect that avoids burning.
The layout plan of power frequency arc test is seen Figure 12.Each parts is respectively among the figure: power supply P, transformer T, K switch, K1, K2, reactor L1, current transformer CT, parallel connection gaps B.
The test amplitude of short circuit in 110kV gap is 25kA, duration 0.2s, and the test amplitude of short circuit in 220kV gap is 31.5kA, duration 0.17s, the short circuit power current arcing of respectively repeatedly closing a floodgate in both cases test.
Write down process of the test in the testing ground with high-speed camera.The result shows that behind the installation parallel connection gaps device, electric arc arc root can be fixed on (or transferring to) electrode and burn, and can protect insulator to avoid power frequency arc effectively and burn.
3. the voltage of 110kV, 220kV overhead transmission line band parallel connection gaps distributes and electric Field Calculation
In order to confirm that the parallel connection gaps lightning protection device distributes and electric field effects to the voltage of 110kV, 220kV overhead transmission line insulator string, this paper calculates.
The voltage distributed data that 110kV does not have gap and a band gap insulator string sees Table 3, table 4.
Table 3 110kV does not have the voltage distributed data of gap and band gap insulator string
| The insulator sequence number | The voltage that 110kV does not have the gap insulation substring distributes | The voltage of 110kV band gap insulator string distributes | ||
| Voltage distribution (V) | Voltage distribution (%) | Voltage distribution (V) | Voltage distribution (%) | |
| 1 | 13007 | 20.48121 | 12192 | 19.19788 |
| 2 | 10428 | 16.42024 | 10415 | 16.39977 |
| 3 | 8972 | 14.12758 | 9117 | 14.35590 |
| 4 | 8159 | 12.84740 | 8288 | 13.05053 |
| 5 | 7706 | 12.13410 | 7877 | 12.40336 |
| 6 | 7516 | 11.83492 | 7697 | 12.11992 |
| 7 | 7720 | 12.15457 | 7921 | 12.47264 |
Table 4 220kV does not have the voltage distributed data of gap and band gap insulator string
| The insulator sequence number | The voltage that 220kV does not have the gap insulation substring distributes | The voltage of 220kV band gap insulator string distributes | ||
| Voltage distribution (V) | Voltage distribution (%) | Voltage distribution (V) | Voltage distribution (%) | |
| 1 | 20147 | 15.86166 | 19130 | 15.06098 |
| 2 | 16245 | 12.78963 | 15410 | 12.13223 |
| 3 | 13136 | 10.34192 | 12557 | 9.88608 |
| 4 | 10742 | 8.45714 | 10499 | 8.26582 |
| 5 | 9131 | 7.1888 | 9264 | 7.29351 |
| 6 | 8126 | 6.39757 | 8457 | 6.65816 |
| 7 | 7574 | 5.96298 | 7886 | 6.20862 |
| 8 | 7125 | 5.60949 | 7433 | 5.85197 |
| 9 | 6852 | 5.39455 | 7126 | 5.61027 |
| 10 | 6721 | 5.29142 | 6994 | 5.50635 |
| 11 | 6775 | 5.33393 | 7064 | 5.56146 |
| 12 | 7017 | 5.52446 | 7293 | 5.74175 |
| 13 | 7426 | 5.84646 | 7904 | 6.22279 |
From the aforementioned calculation result as can be seen: the voltage that the insulator of band parallel connection gaps insulator string lead side bears is lower than gapless situation, illustrates that the gap played certain all pressures effect.In addition from Electric Field Distribution, the maximum of band gap insulator string field intensity appears at the end, gap, the field intensity of air gap in field intensity in the insulator full skirt and the insulator string, illustrating that the gap has not only been played improves the effect that insulator voltage distributes, and the more important thing is and can play the arc effect of leading.
Although the utility model is described; but foregoing description just for illustrative purposes; the utility model is not limited to above-mentioned specific descriptions in conjunction with the accompanying drawings; those of ordinary skills can not break away from the various changes of the utility model spirit to it, and protection range of the present utility model is limited by the accompanying Claim book.
Claims (15)
1. overhead transmission line parallel connection gaps lightning protection device; it is characterized in that; this parallel connection gaps lightning protection device comprises insulator string (2) and ground connection lateral electrode, lead lateral electrode (6,7); described ground connection lateral electrode, lead lateral electrode are connected described insulator string two ends; and between described ground connection lateral electrode, lead lateral electrode, constitute with the air be dielectric and with the series-parallel protection of insulator gap, and make the length (Z) in described protection gap less than the long (Z of the string of described insulator string
0), thereby when described overhead transmission line is struck by lightning, form discharge channel in the described parallel connection gaps.
2. parallel connection gaps lightning protection device according to claim 1 is characterized in that, described insulator string (2) is a suspension insulator, and described ground connection lateral electrode (6) is connected with the ball-eye (1) of described insulator string ground connection side; Described lead lateral electrode (7) then is connected with the bowl head (3) and the suspension clamp (5) of described insulator string lead side by a yoke plate (4).
3. parallel connection gaps lightning protection device according to claim 1 is characterized in that, described insulator string (2) is a suspension insulator, and the ground connection lateral electrode is made of the identical two parts of shape, and described lead lateral electrode is originally as symmetrical shape.
4. parallel connection gaps lightning protection device according to claim 2 is characterized in that, described ball-eye cross sectional shape is a rhombus, and the coupling part of connected described ground connection lateral electrode is designed to corresponding shape.
5. parallel connection gaps lightning protection device according to claim 1 is characterized in that, the outer end of described ground connection lateral electrode is to the distance (X of described insulator string center line
C) between 300-500mm, the height (Y of described ground connection lateral electrode short circuit insulator string
C) being no more than 500mm, described lead lateral electrode outer end is to the distance (X of insulator string center line
P) between 300-500mm, the height (Y of described lead lateral electrode short circuit insulator string
P) be no more than 500mm.
6. parallel connection gaps lightning protection device according to claim 1 is characterized in that, the outer end of described lead lateral electrode is for spherical when being used for the 110KV overhead wire, and sphere diameter (r) is between 20-40mm.
7. parallel connection gaps lightning protection device according to claim 1 is characterized in that, described insulator string is a strain insulator string, and described ground connection lateral electrode (6) and described lead lateral electrode (7) are arranged on the top of insulator string respectively by yoke plate (4).
8. parallel connection gaps lightning protection device according to claim 7 is characterized in that, described insulator string is a strain insulator double insulator string.
9. parallel connection gaps lightning protection device according to claim 1 is characterized in that the outer end of described lead lateral electrode divaricates when being used for the 220KV overhead wire, and the angle between two bifurcateds is not more than 90 degree.
10. parallel connection gaps lightning protection device according to claim 9 is characterized in that, the length of each described bifurcated (b) is the distance (X of described lead lateral electrode outer end to the insulator string center line
P) 1/2-1/3.
11. parallel connection gaps lightning protection device according to claim 10 is characterized in that, gap of the outer end harvest of described lead lateral electrode, and described gap distance (d) is between 25-35mm.
12., it is characterized in that the steel rod diameter of ground connection lateral electrode, lead lateral electrode is between 13-25mm according to the described parallel connection gaps lightning protection device of arbitrary claim among the claim 1-11.
13., it is characterized in that the long ratio (Z/Z of string of the length in protection gap and insulator string (2) according to the described parallel connection gaps lightning protection device of arbitrary claim among the claim 1-11
0) be not less than 75%.
14., it is characterized in that described ground connection lateral electrode, lead lateral electrode are installed to be parallel mode with lead (8) according to the described parallel connection gaps lightning protection device of arbitrary claim among claim 1-6 and the 9-11.
15., it is characterized in that the outer end of ground connection lateral electrode (6) upwarps according to the described parallel connection gaps lightning protection device of arbitrary claim among the claim 1-11.
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|---|---|---|---|
| CN 200420001291 CN2687923Y (en) | 2004-02-12 | 2004-02-12 | Overhead circuit parallel gap lightning protection device |
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|---|---|---|---|
| CN 200420001291 CN2687923Y (en) | 2004-02-12 | 2004-02-12 | Overhead circuit parallel gap lightning protection device |
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| CN101645579B (en) * | 2009-08-25 | 2011-08-17 | 山东迅实电气有限公司 | Lightning prevention protective clearance for electric railway traction power supply system |
| CN101877462B (en) * | 2009-12-01 | 2013-09-04 | 中国电力科学研究院 | Series-parallel gap installing metalware of insulator of electric transmission line and installing method thereof |
| CN101865939A (en) * | 2010-06-17 | 2010-10-20 | 中国电力科学研究院 | Generation device for very fast transient overvoltage |
| CN102621435A (en) * | 2012-04-20 | 2012-08-01 | 李景禄 | Grounding simulation testing device and method |
| CN102709814A (en) * | 2012-04-24 | 2012-10-03 | 重庆大学 | Annular parallel gap lightning protection device for overhead line insulator string |
| CN102709814B (en) * | 2012-04-24 | 2013-09-18 | 重庆大学 | Annular parallel gap lightning protection device for overhead line insulator string |
| CN103545059B (en) * | 2013-10-29 | 2016-09-21 | 国家电网公司 | A kind of insulator that can reduce lightning stroke flashover accident |
| CN103545059A (en) * | 2013-10-29 | 2014-01-29 | 国家电网公司 | Insulator capable of reducing lightning stroke flashover accidents |
| CN104952564A (en) * | 2014-03-27 | 2015-09-30 | 国家电网公司 | Insulator |
| CN104008828A (en) * | 2014-06-11 | 2014-08-27 | 国家电网公司 | Discharge gap device |
| CN104008828B (en) * | 2014-06-11 | 2017-06-20 | 国家电网公司 | A kind of discharging gap apparatus |
| CN104795188A (en) * | 2015-04-17 | 2015-07-22 | 国家电网公司 | Adjustable parallel gap structure of linear insulator string |
| CN105610050B (en) * | 2016-02-24 | 2017-05-03 | 重庆西鹏汇德电力设备制造有限公司 | Continuous adjustable universal lightning protection apparatus equipped with parallel gaps |
| CN105610050A (en) * | 2016-02-24 | 2016-05-25 | 重庆西鹏汇德电力设备制造有限公司 | Continuous adjustable universal lightning protection apparatus equipped with parallel gaps |
| CN106207924A (en) * | 2016-07-19 | 2016-12-07 | 国家电网公司 | The structure of electric line parallel connection gaps |
| CN105957658A (en) * | 2016-07-25 | 2016-09-21 | 国网湖南省电力公司 | Ice-preventing insulator for ground wire ice-melting reconstruction |
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