CN201656389U - Parallel clearance lightning protection device for 35kV overhead distribution lines - Google Patents
Parallel clearance lightning protection device for 35kV overhead distribution lines Download PDFInfo
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- CN201656389U CN201656389U CN2010201981083U CN201020198108U CN201656389U CN 201656389 U CN201656389 U CN 201656389U CN 2010201981083 U CN2010201981083 U CN 2010201981083U CN 201020198108 U CN201020198108 U CN 201020198108U CN 201656389 U CN201656389 U CN 201656389U
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- connection gaps
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Abstract
The utility model provides a parallel clearance lightning protection device for 35kV overhead distribution lines, comprising a chain insulator (3) and a parallel clearance, wherein the parallel clearance consists of a lead wire side electrode (4) and a grounded side electrode (2); and the lead wire side electrode (4) and the grounded side electrode (2) are arranged at two ends of the chain insulator (3) respectively. The device has simple structure and convenient construction, can effectively protect the chain insulator of the line, and does not increase the tripping rate of the original line due to lightning strike.
Description
Technical field
The utility model relates to power distribution circuit lightning protection field, relates to 35kV overhead distribution parallel connection gaps lightning protection device more specifically.
Background technology:
The overhead power line lightning protection is the problem that work about electric power person endeavours to study always.At present, lightning fault is the principal element that influences the line security operation.After lightning stroke flashover takes place, can damage insulator, cause serious accidents such as zero resistance insulator, steel cap come off, conductor cord disconnection, the safe operation of serious threat circuit by the huge energy that power frequency continued flow produces.
Along with the development of electrical network, also more and more higher to the requirement of the fail safe of distribution line and reliability.In China, 35kV overhead distribution insulation pattern mainly contains 3 kinds: 3 sheet glass, 3 porcelain insulators and composite insulator.Compare the more 110kV and the above transmission line of voltage levels, therefore the 35kV overhead distribution is faced with more severe lightning protection situation because lightning withstand level is relatively low.
The lightning protection measures of 35kV overhead distribution mainly contains at present: improve line insulation level, wiring lightning arrester, installing automatic reclosing etc.But these measures all can not effectively prevent the conductor cord disconnection that caused by thunderbolt, accidents such as insulator string infringement.For this reason, the method for at circuit parallel connection gaps (claiming arcing horn again) being installed as employings such as the U.S., Sweden, Finland, Japan abroad prevents accidents such as conductor cord disconnection, insulator string damage.
Parallel connection gaps claims " greeting angle " etc. again, is made up of the pair of metal electrodes that is connected in parallel on the insulator string two ends.Usually, the gas length of parallel connection gaps is less than the length of insulator string, makes the impulse sparkover voltage of parallel connection gaps less than the discharge voltage of insulator string.When circuit was struck by lightning, parallel connection gaps discharged prior to insulator string, and the power frequency arc that produces after the line short ground connection will burn between the air gap at parallel connection gaps two ends, made insulator string avoid the calcination of power frequency continued flow electric arc.This shows,,, can cause the increase of lightning outage rate owing to reduced the lightning withstand level of circuit though the effect of protection insulator string can be played in protection in parallel gap.
In China, existing relevant unit and mechanism have carried out research to parallel connection gaps and have used.But developing parallel connection gaps at present all is to be applicable to 110kV and above transmission line, and can not overcome the shortcoming that lightning outage rate increases.
Summary of the invention
The utility model purpose provides a kind of 35kV of being applicable to overhead distribution, can the protection circuit insulator string, do not increase the parallel connection gaps lightning protection device of lightning outage rate again.
The utility model achieves the above object by the following technical programs: a kind of 35kV overhead distribution parallel connection gaps lightning protection device is provided, this lightning protection device comprises insulator string and parallel connection gaps, parallel connection gaps is made up of lead lateral electrode and ground connection lateral electrode, and described lead lateral electrode and ground connection lateral electrode are contained in the two ends of insulator string respectively.The profile of parallel connection gaps is the arcing horn profile.
Described insulator string is made up of 4 sheet glass insulator sheets, and the physical dimension of parallel connection gaps is: a=330mm; B=20mm; C=450mm; D=400m; E=30mm; F=350mm; D/c=0.889.
Described insulator string is made up of 1 sheet glass insulator sheet and composite insulator, and the physical dimension of parallel connection gaps is: a=330mm; B=35mm; C=720mm; D=630mm; E=55mm; F=350mm; D/c=0.875.
The end of described ground connection lateral electrode upwarps, with the horizontal line angle be 30～60 °.
The end of described lead lateral electrode is spherical, and spherical diameter is 20～35mm; The lead lateral electrode is a rectangle with the cross section of the coupling part of bowl bulb hanging ring; Circular hole is left in described coupling part, and Circularhole diameter is 10～20mm.
Described bowl bulb hanging ring bottom is provided with lateral insert, and the slot cross section is corresponding with the coupling part of the lead lateral electrode that it is connected; Slot leaves circular hole, and Circularhole diameter is 10～20mm.
The utility model has been realized following technique effect:
(1) described 35kV overhead distribution parallel connection gaps lightning protection device is applicable to the 35kV overhead distribution, when circuit is struck by lightning, can play the effect of protection circuit insulator string.
(2) described 35kV overhead distribution parallel connection gaps lightning protection device can not increase the tripping rate with lightning strike of original circuit.
Description of drawings
Fig. 1 is a line insulator string when being 4 sheet glass insulator sheets, the outline drawing of 35kV overhead distribution parallel connection gaps lightning protection device.
Fig. 2 is a line insulator string when being composite insulator and 1 sheet glass insulator sheet, the outline drawing of 35kV overhead distribution parallel connection gaps lightning protection device.
Fig. 3 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device ground wire lateral electrode 2.
Fig. 4 is Fig. 3 vertical view.
Fig. 5 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device lead lateral electrode 4.
Fig. 6 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device bowl bulb hanging ring 5.
Embodiment
Below with reference to accompanying drawing also in conjunction with the embodiments, describe the utility model in detail.
Fig. 1 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device.Wherein insulator string 3 is composed in series by 4 sheet glass insulators.The string length of glass insulation substring 3 is represented with c, parallel connection gaps is losed heart stand-off distance most from representing with d, the ground wire lateral electrode upwarps part and represents with a from the distance of insulator string center line, lead lateral electrode end sphere is represented with f from the distance of insulator string center line, the height of ground wire lateral electrode short circuit insulator string represents that with b the height of lead lateral electrode short circuit insulator string is represented with e.The material of lead lateral electrode 4 and ground wire lateral electrode 2 adopts the Q235 structural carbon steel, and electrode diameter is between 15～25mm.
Fig. 2 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device.Wherein insulator string 3 is composed in series by composite insulator and 1 sheet glass insulator.The string length of insulator string is represented with c, parallel connection gaps two ends beeline is represented with d, the ground wire lateral electrode upwarps part and represents with a from the distance of insulator string center line, lead lateral electrode end sphere is represented with f from the distance of insulator string center line, the height of ground wire lateral electrode short circuit insulator string represents that with b the height of lead lateral electrode short circuit insulator string is represented with e.The diameter of lead lateral electrode 4 and ground wire lateral electrode 2 is between 15～25mm.
Table 1 is the physical dimension of parallel connection gaps.
Table 1 parallel connection gaps physical dimension
| The insulator string pattern | a/mm | b/mm | c/mm | d/mm | e/mm | f/mm | d/c |
| 4 sheet glass insulators | 330 | 20 | 450 | 400 | 30 | 350 | 0.889 |
| Composite insulator+1 sheet glass insulator | 330 | 35 | 720 | 630 | 55 | 350 | 0.875 |
Fig. 3 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device ground wire lateral electrode 2.Ground wire lateral electrode 2 is fixed on the ball-eye 1 by 2 groups of nuts and bolts.Ground wire lateral electrode 2 ends upwarp, and upwarping part is 30～60 ° with the horizontal line angle.
Fig. 5 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device lead lateral electrode 4.Lead lateral electrode 4 ends are spherical, and spherical diameter is 20～35mm.Lead lateral electrode 4 is rectangle with the cross section, coupling part of bowl bulb hanging ring 5, and the circular hole aperture on the lead lateral electrode 4 is 10～20mm, matches with the circular hole of bowl bulb hanging ring 5, and available screw bolt and nut is fixed in bowl bulb hanging ring 5 with lead lateral electrode 4.
Fig. 6 is the outline drawing of 35kV distribution line parallel connection gaps lightning protection device bowl bulb hanging ring 5.Bowl bulb hanging ring 5 bottoms are provided with lateral insert, and the slot shape leaves circular hole, and the aperture is 10～20m.
In actual applications, the effect of protection circuit insulator string can be played when the lightning, lightning impulse test (U50%), voltage-second characteristic test and power-frequency discharge test should be carried out for guaranteeing 35kV overhead distribution parallel connection gaps lightning protection device.The applicant has carried out lightning impulse test, voltage-second characteristic test and power-frequency discharge test to the parallel connection gaps lightning protection device of being invented.
1. the test surge waveform of lightning impulse test adopts the standard lightning wave, research is after parallel connection gaps is installed at the insulator string two ends, whether the lightning impulse electrical discharge arc occurs on the air gap at parallel connection gaps two ends, the U50% thunder discharge voltage of research parallel connection gaps lightning protection device.According to the U50% thunder discharge voltage data that test draws, can be regarded as the tripping rate with lightning strike of 35kV overhead distribution, as table 2.
Table 2 35kV overhead distribution thunder discharge voltage (U50%) and tripping rate with lightning strike
As table 2, the insulator string of former circuit is 3 sheet glass insulators, and tripping rate with lightning strike is 5.08, and behind employing the utility model, tripping rate with lightning strike is 4.24; The insulator string of former circuit is a composite insulator, and tripping rate with lightning strike is 4.41, and behind employing the utility model, tripping rate with lightning strike is 3.95.Result of calculation shows that behind employing the utility model, the tripping rate with lightning strike of circuit is less than the tripping rate with lightning strike of former circuit.
2. by voltage-second characteristic test, purpose is for the variation of studying the lightning wave steepness influence to the discharge voltage and the discharge path of parallel connection gaps lightning protection device.By voltage-second characteristic test as can be known, the parallel connection gaps lightning protection device can play the effect of protection circuit insulator string.
Whether 3. can also check power frequency arc to be fixed on the parallel connection gaps by the power-frequency discharge test burns, plays the effect of protection insulator string.Field test shows that power frequency arc can be fixed between the parallel connection gaps air gap and burn, and protects insulator string to avoid the calcination of power frequency arc effectively.
The above only is a preferred embodiment of the present utility model; be not limited to the utility model; those of ordinary skills can not break away from the various changes of the utility model spirit and principle to it; all within spirit of the present utility model and principle; any change of being done all should be included within the protection range of the present utility model.
Claims (6)
1. 35kV overhead distribution parallel connection gaps lightning protection device, it is characterized in that, this lightning protection device comprises insulator string (3) and parallel connection gaps, parallel connection gaps is made up of lead lateral electrode (4) and ground connection lateral electrode (2), and described lead lateral electrode (4) and ground connection lateral electrode (2) are contained in the two ends of insulator string (3) respectively.
2. 35kV overhead distribution parallel connection gaps lightning protection device according to claim 1 is characterized in that described insulator string (3) is made up of 4 sheet glass insulator sheets, and the physical dimension of parallel connection gaps is: a=330mm; B=20mm; C=450mm; D=400mm; E=30mm; F=350mm; D/c=0.889.
3. 35kV overhead distribution parallel connection gaps lightning protection device according to claim 1 is characterized in that described insulator string (3) is made up of 1 sheet glass insulator sheet and composite insulator, and the physical dimension of parallel connection gaps is: a=330mm; B=35mm; C=720mm; D=630mm; E=55mm; F=350mm; D/c=0.875.
4. 35kV overhead distribution parallel connection gaps lightning protection device according to claim 1 is characterized in that the end of ground connection lateral electrode (2) upwarps, with the horizontal line angle be 30～60 °.
5. 35kV overhead distribution parallel connection gaps lightning protection device according to claim 1 is characterized in that, the end of lead lateral electrode (4) is spherical, and spherical diameter is 20～35mm; Lead lateral electrode (4) is a rectangle with the cross section of the coupling part of bowl bulb hanging ring (5); Circular hole is left in described coupling part, and Circularhole diameter is 10～20mm.
6. 35kV overhead distribution parallel connection gaps lightning protection device according to claim 5 is characterized in that, bowl bulb hanging ring (5) bottom is provided with lateral insert, and the slot cross section is corresponding with the coupling part of the lead lateral electrode (4) that it is connected; Slot leaves circular hole, and Circularhole diameter is 10～20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201981083U CN201656389U (en) | 2010-05-21 | 2010-05-21 | Parallel clearance lightning protection device for 35kV overhead distribution lines |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201981083U CN201656389U (en) | 2010-05-21 | 2010-05-21 | Parallel clearance lightning protection device for 35kV overhead distribution lines |
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| CN201656389U true CN201656389U (en) | 2010-11-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680370A (en) * | 2016-03-31 | 2016-06-15 | 国网辽宁省电力有限公司辽阳供电公司 | Discharge gap live-line installation and dismounting method |
| CN110535089A (en) * | 2019-10-11 | 2019-12-03 | 云南电网有限责任公司电力科学研究院 | Power distribution network lightning conducter indirect earthed laying method and device |
| CN111145967A (en) * | 2019-12-12 | 2020-05-12 | 广西电网有限责任公司电力科学研究院 | Device capable of suppressing lightning overvoltage of distribution line |
| CN113708328A (en) * | 2021-08-24 | 2021-11-26 | 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 | Protection structure for photoelectric separator |
-
2010
- 2010-05-21 CN CN2010201981083U patent/CN201656389U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680370A (en) * | 2016-03-31 | 2016-06-15 | 国网辽宁省电力有限公司辽阳供电公司 | Discharge gap live-line installation and dismounting method |
| CN110535089A (en) * | 2019-10-11 | 2019-12-03 | 云南电网有限责任公司电力科学研究院 | Power distribution network lightning conducter indirect earthed laying method and device |
| CN111145967A (en) * | 2019-12-12 | 2020-05-12 | 广西电网有限责任公司电力科学研究院 | Device capable of suppressing lightning overvoltage of distribution line |
| CN113708328A (en) * | 2021-08-24 | 2021-11-26 | 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 | Protection structure for photoelectric separator |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20120521 |