CN201243186Y - Parallel connection clearance device for V-shaped insulator string of high-tension overhead line - Google Patents
Parallel connection clearance device for V-shaped insulator string of high-tension overhead line Download PDFInfo
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- CN201243186Y CN201243186Y CNU2007201904969U CN200720190496U CN201243186Y CN 201243186 Y CN201243186 Y CN 201243186Y CN U2007201904969 U CNU2007201904969 U CN U2007201904969U CN 200720190496 U CN200720190496 U CN 200720190496U CN 201243186 Y CN201243186 Y CN 201243186Y
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- parallel connection
- connection gaps
- arcing horn
- insulator string
- insulator
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- 208000025274 Lightning injury Diseases 0.000 description 3
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Abstract
The utility model provides a parallel-connecting clearance device of a V-shaped insulator chain used in a high-voltage overhead circuit, and the parallel-connecting clearance device is arranged among the insulator chains connected in series; the shape of the parallel-connecting clearance device is an arcing horn shape. The thermal stability of the parallel-connecting clearance device is good.
Description
Technical field
The utility model relates to power domain, more specifically, relates to a kind of V-type insulator string and parallel connection gaps device thereof that is used for high-tension overhead line.
Background technology
The aerial power transmission line lightning protection is antifouling to be the problem that work about electric power person makes great efforts to study always.In recent years, lightning fault and filthy fault remain one of principal element that influences the line security operation.Power frequency continued flow behind lightning stroke flashover or the pollution flashover can damage insulator, causes zero resistance insulator even insulator to fall to go here and there power outage, brings difficulty for the circuit operation maintenance.
The existing lightning protection measures of aerial power transmission line has: set up lightning conducter, reduce pole tower ground resistance, reinforced insulation, install coupling ground wire additional, leakage conductor etc. is installed.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 rack weakness of the early stage electrical network of China, the actual conditions of poor performance, it is suitable that lightning protection only adopts " obstruction type " mode.In recent years, China's electrical network fast development, grid structure is more and more stronger; And along with technological progress, transformer station uses the SF6 circuit breaker in a large number, the relaying protection microcomputerization, and reclosing device obtains generally to use, and seemed inadequately comprehensive if still continue to use " obstruction type " lightning protection mode this moment.
" lightning protection of insulator parallel connection gaps " this Lightning Protection of " dredging type ", its core concept are to allow circuit that certain tripping rate with lightning strike is arranged.Adopt inter space device in parallel with insulator string, the thunder and lightning energy is discharged by gap discharge, dredges power frequency arc.Though lightning stroke flashover is arranged, and reclosing can be successful, no permanent fault.
The lightning protection principle of parallel connection gaps is: the pair of metal electrodes (claiming arcing horn/arc leading angle again) in parallel at the insulator string two ends, constitute the protection gap, and protect the distance in gap long usually less than the string of insulator string.When overhead transmission line is struck by lightning, produce very high lightning overvoltage on the insulator string, but because of the lightning impulse discharge voltage in protection gap is lower than the discharge voltage of insulator string, so protect the gap at first to discharge.The power frequency arc that continues by the formed discharge channel of parallel connection gaps, is directed to the arcing horn end under electric power and thermal stress effect, be fixed on the arcing horn cigarette burning, thereby the protection insulator avoids the electric arc calcination.
The parallel connection gaps lightning protection device should have the guiding thunder discharge, shift and dredge power frequency arc, even three kinds of functions of power frequency electric field, and this has much relations with shape and size of forming the parallel connection gaps arcing horn.For example Ri Ben parallel connection gaps is more with original insulator string short circuit, its Z/Z0 in 75～85% scope, it is calculated that mostly, if employing Z/Z0 is 75% gap, can cause the tripping rate with lightning strike of circuit to improve more than 30% inapplicable China transmission line than rules value.
Fig. 1 shows 110kV overhead transmission line parallel connection gaps lightning protection device contour structures of the prior art (I type string).
" overhead transmission line parallel connection gaps lightning protection device " is primarily aimed at insulator list string (I type string).Mainly be made up of upper/lower electrode, electrode material adopts Q235 carbon steel, between steel rod diameter 13～19mm.Top electrode is connected with the ball-eye of insulator string ground connection side, and for avoiding the relative motion between top electrode and the ball-eye, the Cross section Design at ball-eye middle part is a rhombus, and the top electrode union end also is designed to corresponding shape, as Fig. 2, shown in Figure 3.Top electrode upwarps slightly away from an end of insulator string, is called aciculiform.The shape of bottom electrode end is different with electric pressure.The 110kV bottom electrode is designed to sphere.The end of 220kV bottom electrode divaricates, and is called the PS type.
The shortcoming of technique scheme is as follows:
(1) do not consider to be applicable to the parallel connection gaps of " V " shape insulator string
A large amount of tests of " overhead transmission line parallel connection gaps lightning protection device " and Theoretical Calculation all are at insulator list string (I type) band parallel connection gaps." V " shape insulator string band parallel connection gaps needs research experiment again.The V-type insulator string as shown in Figure 4.
(2) do not consider the thermal stability requirement of insulator parallel connection gaps when power frequency continued flow
And along with the continuous development of city net, the short circuit current of 220kV system is increasing, and its three-phase shortcircuit electric current calculated value has also surpassed 50kA; And the short circuit current of 110kV system also reaches more than the 30kA, and the guarantor that continues of some 110kV circuit is longer opening time.This dodges power frequency continued flow and has proposed higher thermal stability requirement connecing the insulator parallel connection gaps.
Summary of the invention
The utility model aims to provide a kind of parallel connection gaps device that is used for the V-type insulator string of high-tension overhead line, can solve above-mentioned thermal stability problems.
In embodiment of the present utility model, provide the utility model that a kind of parallel connection gaps device that is used for the V-type insulator string of high-tension overhead line is provided, it is between the insulator of serial connection, and the profile of parallel connection gaps device is the arcing horn profile.
Preferably, high-tension overhead line is 220kV, and the V-type insulator string is 2 * 16 insulators, and the physical dimension of arcing horn profile is: Z
0=146 * 16mm; Z=146 * 14mm; X
C=490mm; X
P=570mm; Y
C=219mm; Y
P=73mm; Z/Z
0=0.875.
Preferably, high-tension overhead line is 110kV, and the V-type insulator string is 2 * 9 insulators, and the physical dimension of arcing horn profile is: Z
0=146 * 9mm; Z=146 * 7.5mm; X
C=400mm; X
P=450mm; Y
C=146mm; Y
P=73mm; Z/Z
0=0.833.
Preferably, the last arcing horn of arcing horn profile is that pin type end upwarps.
Preferably, high-tension overhead line is 110kV, and the following arcing horn end of arcing horn profile is spherical.
Preferably, Qiu Xing diameter is 30～50mm.
Preferably, high-tension overhead line is 220kV, and the following arcing horn end of arcing horn profile is the ellipse of band gap.
Preferably, the ellipse of band gap begins bifurcated at 1/3 place of following arcing horn total length, and the angle of two bifurcateds is smaller or equal to 45 °, and the gap of 25～35mm is left in the end.
The better heat stability of this parallel connection gaps device.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used to explain the utility model, do not constitute improper qualification of the present utility model.In the accompanying drawings:
Fig. 1 shows 110kV overhead transmission line parallel connection gaps lightning protection device contour structures of the prior art (I type string);
Fig. 2 shows arcing horn outline drawing on the insulator parallel connection gaps among Fig. 1;
Fig. 3 shows the ball-eye outline drawing among Fig. 1;
Fig. 4 shows V-type insulator string assembly drawing;
Fig. 5 shows according to arcing horn outline drawing on the V-type insulator string parallel connection gaps of the embodiment of the invention;
Fig. 6 shows according to arcing horn outline drawing under the 110kV circuit V-type insulator string parallel connection gaps of the embodiment of the invention;
Fig. 7 shows according to arcing horn outline drawing under the 220kV circuit V-type insulator string parallel connection gaps of the embodiment of the invention;
Fig. 8 shows the V-type insulator string parallel connection gaps ball-clevis according to the embodiment of the invention;
Fig. 9 shows the V-type insulator string parallel connection gaps socket-clevis eye according to the embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
Fig. 5 shows according to arcing horn outline drawing on the V-type insulator string parallel connection gaps of the embodiment of the invention, and the profile of this parallel connection gaps device is the arcing horn profile.
The arcing horn shaped design smoothness of parallel connection gaps does not have angle and curved, has guaranteed the speed in the electric arc moving process.Adopt arcing horn in parallel with the V-type insulator string, make thunder and lightning along gap discharge, dredge power frequency arc, the protection insulator avoids burn, is that the strong of traditional transmission line lightning protection measure replenishes.The V-type parallel connection gaps arcing horn of present embodiment design in the duration of short circuit that allows, is drawn power frequency arc, can obviously reduce circuit because the insulator that thunderbolt or pollution flashover cause damages.
Preferably, high-tension overhead line is 220kV, and the V-type insulator string is 2 * 16 insulators, and the physical dimension of arcing horn profile is: Z
0=146 * 16mm; Z=146 * 14mm; X
C=490mm; X
P=570mm; Y
C=219mm; Y
P=73mm; Z/Z
0=0.875.
Preferably, high-tension overhead line is 110kV, and the V-type insulator string is 2 * 9 insulators, and the physical dimension of arcing horn profile is: Z
0=146 * 9mm; Z=146 * 7.5mm; X
C=400mm; X
P=450mm; Y
C=146mm; Y
P=73mm; Z/Z
0=0.833.
Following table is the tabulation of parallel connection gaps arcing horn physical dimension
| Insulator string | Z 0/mm | Z/mm | X C/mm | X P/mm | Y C/mm | Y P/mm | Z/Z 0 |
| 220kV V-type string | 146×16 | 146×14 | 490 | 570 | 219 | 73 | 0.875 |
| 110kV V-type string | 146×9 | 146×7.5 | 400 | 450 | 146 | 73 | 0.833 |
The variform gap of arcing horn is at thunder discharge voltage (U
50%Value) with the discharge path aspect, no significant difference.
Preferably, the last arcing horn of arcing horn profile is that pin type end upwarps.
Last arcing horn all adopts pin type end to upwarp, and such design makes the Z value of parallel connection gaps can not change because of the ablation of last arcing horn end.
Sphere can be adopted in the following arcing horn end of 110kV insulator parallel connection gaps, to increase the ability of its arc ablation resistance.Bulb diameter can be 30～50mm.Fig. 6 shows according to arcing horn outline drawing under the 110kV circuit V-type insulator string parallel connection gaps of the embodiment of the invention.Fig. 8 shows the V-type insulator string parallel connection gaps ball-clevis according to the embodiment of the invention.
The ellipse that the following arcing horn of 220kV insulator parallel connection gaps can be designed to gap (begins bifurcated at 1/3 place that descends the arcing horn total length, the angle of two bifurcateds is smaller or equal to 45 degree, the gap of 25～35mm is left in the end), gap can avoid arc transfer speed too slow.Fig. 7 shows according to arcing horn outline drawing under the 220kV circuit V-type insulator string parallel connection gaps of the embodiment of the invention.Fig. 9 shows the V-type insulator string parallel connection gaps socket-clevis eye according to the embodiment of the invention.
2 * 16 insulators that these two kinds of gaps can be used for 220kV V-type string that dangles, 2 * 9 insulators of the 110kV V-type string that dangles.The parallel connection gaps device is made up of upper and lower arcing horn.The ball-eye of one end of last arcing horn and insulator string ground connection side links.The bowl head of following arcing horn and insulator string lead side links.The arcing horn of V-type connection in series-parallel inter space device is placed along the lead symmetry.
The profile schematic diagram of 110kV, 220kV overhead transmission line V-type insulator string usefulness parallel connection gaps arcing horn such as Fig. 5～shown in Figure 9.Connect at parallel connection gaps in the design of gold utensil (bulb, bowl head), adopt standard component in principle as far as possible, as required some gold utensil is carried out particular design again.Fig. 8 and Fig. 9 are V-type insulator string parallel connection gaps ball-clevis and socket-clevis eyes.
In the middle of practice, play the effect of protecting insulator with parallel connection gaps when lightning or the pollution flashover for guaranteeing 110kV, 220kV overhead transmission line V-type insulator string, should carry out lightning impulse (U
50%) and voltage-second characteristic test and the big electric current arcing of power frequency attribute testing.The applicant has carried out lightning impulse (U to the inter space device of being invented
50%) and voltage-second characteristic test and the big electric current arcing of power frequency attribute testing.The parallel connection gaps test product has been carried out lightning impulse discharge voltage (U
50%) test.
1. lightning impulse (U
50%) test is will study behind the parallel connection gaps of insulator string two ends, whether lightning impulse discharge occurs on the air gap, arcing horn end.By experimental observation, the lightning wave flashover path is all in the end of test product.The better linearity relation is arranged between clearance distance and the discharge voltage value.
2. parallel connection gaps has been carried out voltage-second characteristic test, purpose is to study the influence of the variation of lightning impulse wave steepness to parallel connection gaps flashover voltage and discharge path.From the thunder and lightning voltage-second characteristic test as can be known parallel connection gaps insulator is played a very good protection.
3. power frequency arc arcing attribute testing is that the electric arc whether parallel connection gaps can make power frequency continued flow form left insulator, outwards develops along arcing horn after research was with the insulator string of parallel connection gaps to suffer lightning stroke flashover, thus the protection insulator string.The big electric current arcing of power frequency attribute testing is the result show, the parallel connection gaps arcing horn of this Project design in the duration of short circuit that allows, is drawn power frequency arc.The power frequency arc that the insulator parallel connection gaps can tolerate 50kA continues calcination 0.2s, and can protect insulator to avoid the electric arc calcination, can obviously reduce circuit because the insulator that thunderbolt or pollution flashover cause damages.
The utility model is applicable to the parallel connection gaps of 110kV grade and 220kV grade transmission line V-type suspension insulator, and is simple in structure, can play the effect of protection insulator.The big electric current arcing of power frequency attribute testing result shows that the configuration design of arcing horn smoothness helps dredging of power frequency arc.The power frequency arc that the insulator parallel connection gaps that the utility model is developed can tolerate 50kA continues calcination 0.2s, and can protect insulator to avoid the electric arc calcination.For the bigger transformer station of busbar short-circuit electric current, installing insulator parallel connection gaps can satisfy the heat-staple requirement of short circuit current on several basic shaft tower of outlet.The shape and the external diameter of existing parallel connection gaps can guarantee that at least 3 50kA power currents continue arcing 0.2s, and still not change gap size, make parallel connection gaps still effective.
As can be seen from the above description, the utility model the above embodiments have realized following technique effect:
(1) Yan Zhi the parallel connection gaps that is applicable to 110kV grade and 220kV grade transmission line V-type suspension insulator is simple in structure, can play the effect of protection insulator when lightning or pollution flashover.
(2) the insulator parallel connection gaps developed of the utility model power frequency arc that can tolerate 50kA continues calcination 0.2s, and can protect insulator to avoid the electric arc calcination.
The above is a preferred embodiment of the present utility model only, is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within spirit of the present utility model and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (8)
1. parallel connection gaps device that is used for the V-type insulator string of high-tension overhead line, it is between the insulator of serial connection, it is characterized in that, and the profile of described parallel connection gaps device is the arcing horn profile.
2. parallel connection gaps device according to claim 1 is characterized in that, described high-tension overhead line is 220kV, and described V-type insulator string is 2 * 16 insulators, and the physical dimension of described arcing horn profile is:
Z
0＝146×16mm；
Z＝146×14mm；
X
C＝490mm；
X
P＝570mm；
Y
C＝219mm；
Y
P＝73mm；
Z/Z
0＝0.875。
3. parallel connection gaps device according to claim 1 is characterized in that, described high-tension overhead line is 110kV, and described V-type insulator string is 2 * 9 insulators, and the physical dimension of described arcing horn profile is:
Z
0＝146×9mm；
Z＝146×7.5mm；
X
C＝400mm；
X
P＝450mm；
Y
C＝146mm；
Y
P＝73mm；
Z/Z
0＝0.833。
4. parallel connection gaps device according to claim 1 is characterized in that, the last arcing horn of described arcing horn profile is that pin type end upwarps.
5. parallel connection gaps device according to claim 1 is characterized in that, described high-tension overhead line is 110kV, and the following arcing horn end of described arcing horn profile is spherical.
6. parallel connection gaps device according to claim 5 is characterized in that, the diameter of described sphere is 30～50mm.
7. parallel connection gaps device according to claim 1 is characterized in that, described high-tension overhead line is 220kV, and the following arcing horn end of described arcing horn profile is the ellipse of band gap.
8. parallel connection gaps device according to claim 7 is characterized in that, the ellipse of described band gap begins bifurcated at described 1/3 place of arcing horn total length down, and the angle of two bifurcateds is smaller or equal to 45 °, and the gap of 25～35mm is left in the end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201904969U CN201243186Y (en) | 2007-11-30 | 2007-11-30 | Parallel connection clearance device for V-shaped insulator string of high-tension overhead line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201904969U CN201243186Y (en) | 2007-11-30 | 2007-11-30 | Parallel connection clearance device for V-shaped insulator string of high-tension overhead line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201243186Y true CN201243186Y (en) | 2009-05-20 |
Family
ID=40716480
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201904969U Expired - Lifetime CN201243186Y (en) | 2007-11-30 | 2007-11-30 | Parallel connection clearance device for V-shaped insulator string of high-tension overhead line |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714748B (en) * | 2009-10-12 | 2012-05-09 | 中国电力科学研究院 | Method and system for determining serial and parallel connection gaps of overhead power transmission line insulators |
| CN102496427A (en) * | 2011-12-08 | 2012-06-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Parallel gap electrode used for ultrahigh voltage transmission line composite insulator lightning protection |
| CN102709814A (en) * | 2012-04-24 | 2012-10-03 | 重庆大学 | Annular parallel gap lightning protection device for overhead circuit insulator string |
| CN102751056A (en) * | 2012-07-24 | 2012-10-24 | 固力发集团有限公司 | Discharge gap device |
| CN104008828A (en) * | 2014-06-11 | 2014-08-27 | 国家电网公司 | Discharge gap device |
| CN105182195A (en) * | 2015-08-26 | 2015-12-23 | 芜湖市凯鑫避雷器有限责任公司 | Gap distance determination method for lightning arrester with series gap |
-
2007
- 2007-11-30 CN CNU2007201904969U patent/CN201243186Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101714748B (en) * | 2009-10-12 | 2012-05-09 | 中国电力科学研究院 | Method and system for determining serial and parallel connection gaps of overhead power transmission line insulators |
| CN102496427A (en) * | 2011-12-08 | 2012-06-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Parallel gap electrode used for ultrahigh voltage transmission line composite insulator lightning protection |
| CN102709814A (en) * | 2012-04-24 | 2012-10-03 | 重庆大学 | Annular parallel gap lightning protection device for overhead circuit insulator string |
| CN102709814B (en) * | 2012-04-24 | 2013-09-18 | 重庆大学 | Annular parallel gap lightning protection device for overhead circuit insulator string |
| CN102751056A (en) * | 2012-07-24 | 2012-10-24 | 固力发集团有限公司 | Discharge gap device |
| 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 |
| CN105182195A (en) * | 2015-08-26 | 2015-12-23 | 芜湖市凯鑫避雷器有限责任公司 | Gap distance determination method for lightning arrester with series gap |
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|---|---|---|---|
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| GR01 | Patent grant | ||
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Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: BEIJING ELECTRIC POWER CORP. Effective date: 20130529 Owner name: BEIJING ELECTRIC POWER CORP. CHINA ELECTRIC POWER Free format text: FORMER OWNER: CHINA ELECTRIC POWER RESEARCH INSTITUTE Effective date: 20130529 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 100031 XICHENG, BEIJING TO: 100031 DONGCHENG, BEIJING |
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| TR01 | Transfer of patent right |
Effective date of registration: 20130529 Address after: 100031 West Chang'an Avenue, Beijing, No. 86 Patentee after: State Grid Corporation of China Patentee after: Beijing Electric Power Corp. Patentee after: China Electric Power Research Institute Address before: 100031 Beijing Qianmen West Street, Xicheng District, No. 41 Patentee before: Beijing Electric Power Corp. Patentee before: China Electric Power Research Institute |
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| CX01 | Expiry of patent term |
Granted publication date: 20090520 |