CN1776983A - Lightning-inductive shielding line for 10KV overhead insulated conducting wire for preventing thunderstrike breakage - Google Patents
Lightning-inductive shielding line for 10KV overhead insulated conducting wire for preventing thunderstrike breakage Download PDFInfo
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- CN1776983A CN1776983A CN 200510094896 CN200510094896A CN1776983A CN 1776983 A CN1776983 A CN 1776983A CN 200510094896 CN200510094896 CN 200510094896 CN 200510094896 A CN200510094896 A CN 200510094896A CN 1776983 A CN1776983 A CN 1776983A
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- lightning
- shielding conductor
- conductor
- guide wire
- insulated conductor
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- 239000004020 conductor Substances 0.000 claims abstract description 50
- 230000006698 induction Effects 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 7
- 238000009413 insulation Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910052737 gold Inorganic materials 0.000 description 3
- 208000025274 Lightning injury Diseases 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241001234523 Velamen Species 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- Suspension Of Electric Lines Or Cables (AREA)
Abstract
Induction thunder shield wire for lightning protection is laid near to overhead insulated conductor. Distance between shield wire and insulated conductor is 0.20m - 1m. The shield wire is installed and connected to cross arm of wire pole of overhead line. Two ends of shield wire, and every 2-5 pieces of wire pole in middle are grounded enforcedly. Ground resistance is less than 30 ohm. Advantages are: advance method, low cost, small quantity of maintenance work. The shield wire shows good effect for lowering thunder inducted voltage on the overhead insulated conductor. The method is suitable to 10KV overhead insulated conductor for lightning protection.
Description
Technical field
The present invention relates to a kind of application induction thunder shielding conductor and prevent that in the 10KV suspended insulated guide wire induction lightening overvoltage from causing the method for broken string, press insulated overhead line shocking preventing technology field in belonging to.
Background technology
The 10KV insulated overhead line has single loop to be triangularly arranged and the double loop vertical arrangement.Producing lightning overvoltage on the insulated overhead line has two kinds, and a kind of is that thunder is attacked the direct lightning strike overvoltage that circuit causes directly, and another kind is because the caused induction lightening overvoltage of electromagnetic induction near the thunderbolt circuit.About 20% is direct lightning strike in the thunderbolt of 10KV distribution line, and wherein the electric current of 50% above direct lightning strike surpasses 20kA; About 80% is the induction thunder, wherein responds to the discharging current of thunder more than 95% less than 1000A.The overhead distribution insulation level is low, even if the installing lightning conducter also can be strikeed back, prevents that the effect of direct lightning strike is little.Distribution line mainly is to prevent that the induction lightening overvoltage from causing broken string.The main cause that causes the insulated circuit lightning-caused breaking is that power frequency continued flow blows lead and causes behind the lightning flash over.Studies show that: when insulated overhead line causes flashover because of lightning overvoltage, moment arc current very big but the time is very short, be generally several microseconds to several milliseconds, thereby lightning stroke flashover only can form a pin hole and can not cause broken string on the insulating barrier of insulated conductor.But, when the lightning overvoltage flashover, flashover and form the metallic short circuit passage between two-phase or three-phase (not necessarily on the same electric pole) particularly, its arc energy will increase suddenly.Because the suspended insulated guide wire insulating barrier hinders electric arc at its surface sliding, high temperature arc velamen is fixed on the breakdown point of insulating barrier, and power frequency arc afterflow (a few kiloampere) is concentrated to be fixed on the place's smooth combustion of insulated conductor insulation breakdown pin hole until blew lead before the circuit breaker action.
At present, prevent to be struck by lightning and cause the major measure of insulated conductor broken string can be divided into following several:
1) lightning arrester is installed: overhead ground wire and lightning arrester are installed are limited lightning overvoltage and absorb the thunder and lightning energy.The method application cost height will increase the workload that day-to-day operation is safeguarded.
2) prolong flashover path: its objective is by prolonging flashover path, electric arc is extinguished easily.The method is performance difficulty in practice, and very difficult location needs the position of reinforced insulation.
3) insulated conductor is peeled off in the part: adopt anti-lead fusing measure and novel insulator and gold utensil; lead is peeled off in the part; be equivalent to plain conductor; electric arc can slide in released part; behind the lightning stroke flashover; make power frequency arc arc root shift or be fixed on the special gold utensil and burn, thereby guardwire avoids the burn broken string, rather than be fixed on certain some ablation.The method is damaged insulated conductor, influence the life-span of insulated conductor, and the penetration type gold utensil is very high to the insulated conductor quality requirement.
Summary of the invention
The objective of the invention is to provide a kind of enforcement easy, cost is low, and the induction thunder shielding conductor of being convenient to safeguard is used for the anti-lightning strike broken string of 10KV suspended insulated guide wire.
The present invention is achieved by the following technical solutions, induction thunder shielding conductor is used for the anti-lightning strike broken string of 10KV suspended insulated guide wire, it is characterized in that near suspended insulated guide wire, laying the induction thunder shielding conductor that prevents lightning-caused breaking, the distance of shielding conductor and insulated conductor is 0.20 meter～1 meter, shielding conductor is installed and is connected on the cross-arm of overhead transmission line electric pole, and the two ends of shielding conductor and centre are provided with many places and force ground connection.Many places pressure ground connection is to be provided with every 2～5 electric poles to force ground connection in the middle of described, and earth resistance is less than 30 ohm.
The present invention lays induction thunder shielding conductor near the 10KV suspended insulated guide wire, do not influence the wire insulation performance of former overhead transmission line, reduces lightning induced voltage significantly, avoid or reduce lightning-caused breaking, economical and practical, implement simple and convenient, cost is low, and the day-to-day operation maintenance workload is little.Steel strand wire as shielding conductor adopt the GJ-35 steel strand wire, and satisfaction is answered the through-flow of lightning current.Shielding conductor is connected with cross-arm on every electric pole, by the electric pole natural grounding, increases pressure ground connection every 2～5 electric poles, and earth resistance satisfies and reduces the requirement that induction lightening is pressed less than 30 ohm.Use EMTP software thunder and lightning induction voltage is carried out analog simulation, the amplitude of each parameter and induced voltage and the relation between the waveform are analyzed, and the overhead transmission line lightning induced voltage that is provided with induction thunder shielding conductor is verified by example, the result shows, electromagnetic coupled and shunting action by shielding conductor, reduce lightning induced voltage on the insulated conductor, the lightning induced voltage that shielded pair reduces on the suspended insulated guide wire has good effect.Induction thunder shielding conductor is used for the anti-lightning strike broken string of 10KV suspended insulated guide wire, avoids damaging insulated conductor, prolongs the useful life of insulated conductor.
Description of drawings
Fig. 1 is a single-circuit enforcement schematic diagram of the present invention;
Fig. 2 is a two circuit enforcement schematic diagram of the present invention;
Among the figure: 1 insulated conductor, 2 electric poles, 3 cross-arms, 4 shielding conductors.
Embodiment
Embodiment 1:
An induction thunder shielding conductor 4 is set in the middle of the three phase isolated lead 1 of the overhead transmission line of single-circuit 10KV rounded projections arranged, shielding conductor 4 is 0.20 meter～1 meter with the distance of insulated conductor 1, shielding conductor 4 is installed and is connected on the cross-arm 3 of overhead transmission line electric pole 2, the two ends of shielding conductor and middle the setting every 2～5 electric poles are forced ground connection, and earth resistance is less than 30 ohm.
Embodiment 2:
In the middle of two row's insulated conductors 1 of the overhead transmission line of two circuit 10KV vertical arrangement, lay two induction thunder shielding conductors 4, shielding conductor 4 is 0.20 meter～1 meter with the distance of insulated conductor 1, shielding conductor 4 is installed and is connected on the cross-arm 3 of overhead transmission line electric pole 2, the two ends of shielding conductor and middle the setting every 2～5 electric poles are forced ground connection, and earth resistance is less than 30 ohm.
Claims (2)
1, a kind of induction thunder shielding conductor is used for the anti-lightning strike broken string of 10KV suspended insulated guide wire, it is characterized in that near suspended insulated guide wire, laying the induction thunder shielding conductor that prevents lightning-caused breaking, the distance of shielding conductor and insulated conductor is 0.20 meter～1 meter, shielding conductor is installed on the cross-arm of the electric pole that is connected suspended insulated guide wire, and the two ends of shielding conductor and centre are provided with many places and force ground connection.
2, induction thunder shielding conductor according to claim 1 is used for the anti-lightning strike broken string of 10KV suspended insulated guide wire, it is characterized in that it is to be provided with every 2～5 electric poles to force ground connection that ground connection is forced in described middle many places, and earth resistance is less than 30 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100948965A CN100428601C (en) | 2005-10-12 | 2005-10-12 | Lightning-inductive shielding line for 10KV overhead insulated conducting wire for preventing thunderstrike breakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100948965A CN100428601C (en) | 2005-10-12 | 2005-10-12 | Lightning-inductive shielding line for 10KV overhead insulated conducting wire for preventing thunderstrike breakage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1776983A true CN1776983A (en) | 2006-05-24 |
| CN100428601C CN100428601C (en) | 2008-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100948965A Active CN100428601C (en) | 2005-10-12 | 2005-10-12 | Lightning-inductive shielding line for 10KV overhead insulated conducting wire for preventing thunderstrike breakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100428601C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290775A (en) * | 2011-04-26 | 2011-12-21 | 安徽省电力公司淮北供电公司 | Lightning-caused breaking prevention method for 10kV overhead insulating line |
| CN103295693A (en) * | 2013-05-29 | 2013-09-11 | 国家电网公司 | Lightening-breakage-preventing medium-voltage insulating wire |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH620059A5 (en) * | 1978-02-03 | 1980-10-31 | Energie Froide Int Sa | |
| US5694286A (en) * | 1996-09-23 | 1997-12-02 | Fowler; William J. | Lightning protection device |
| CN2530371Y (en) * | 2002-03-29 | 2003-01-08 | 陈春元 | Lighting protection arrester |
| CN2824393Y (en) * | 2005-10-12 | 2006-10-04 | 江苏省电力公司扬州供电公司 | Induction thunder screening wire for preventing 10KV overhead insulative conductor from breaking by lightning striking |
-
2005
- 2005-10-12 CN CNB2005100948965A patent/CN100428601C/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290775A (en) * | 2011-04-26 | 2011-12-21 | 安徽省电力公司淮北供电公司 | Lightning-caused breaking prevention method for 10kV overhead insulating line |
| CN102290775B (en) * | 2011-04-26 | 2015-03-25 | 国家电网公司 | Lightning-caused breaking prevention method for 10kV overhead insulating line |
| CN103295693A (en) * | 2013-05-29 | 2013-09-11 | 国家电网公司 | Lightening-breakage-preventing medium-voltage insulating wire |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100428601C (en) | 2008-10-22 |
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER CO. STATE ELECTRIC NET CROP Effective date: 20121022 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121022 Address after: 225009 Weiyang Road, Jiangsu, China, No. 179, No. Patentee after: Yangzhou Power Supply Company of Jiangsu Electric Power Company Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 225009 Weiyang Road, Jiangsu, China, No. 179, No. Patentee before: Yangzhou Power Supply Company of Jiangsu Electric Power Company |