CN101303917B - Self-heating freezing-proof overhead conductor - Google Patents
Self-heating freezing-proof overhead conductor Download PDFInfo
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- CN101303917B CN101303917B CN2008100163427A CN200810016342A CN101303917B CN 101303917 B CN101303917 B CN 101303917B CN 2008100163427 A CN2008100163427 A CN 2008100163427A CN 200810016342 A CN200810016342 A CN 200810016342A CN 101303917 B CN101303917 B CN 101303917B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
The invention discloses a self-heating and anti-icing overhead conductor, belonging to the technology field of overhead conductors in electric power industry; the overhead conductor consists of a conductor core (1) and a stranded conductor (2). The conductor core (1) adopts a galvanizing steel wire while the stranded conductor (2) is an aluminum conductor and is stranded on the outside of the conductor core (1). The overhead conductor is characterized in that an insulating layer (3) is arranged between layers of the stranded conductor (2). The insulating layer (3) with a thickness of 0.3 to 0.5mm is provided with 1 to 2 layers and formed by winding insulating beltings for wrapping. Compared with the overhead conductor in prior art, the self-heating and anti-icing overhead conductor can beheated by changing the electrifying section area, so the overheard conductor can be automatically heated to remove the ice layer on the surface of the overhead conductor and assure power transmissionsafety. Meanwhile, the overhead conductor has simply structure, can save the labor and material for the maintenance of lines, lower the cost for the maintenance of lines and be extensively applied tothe power transmission with a voltage of over 35 KV.
Description
Technical field
The present invention relates to a kind of electric power aerial condutor, particularly a kind of self-heating freezing-proof overhead conductor.
Background technology
The existing power aerial condutor is made of core and stranded conductor mostly, and core generally adopts galvanized steel wire, plays the tension effect, and stranded conductor is an aluminum conductor, is stranded in the core outside, is used for the high-tension electricity long-distance transmissions.The aerial condutor of this structure in non-icing season or do not have under the weather condition of wind and snow, can both satisfy the requirement of safety transmission of electricity.But in actual motion, the existing deficiency of this aerial condutor is: because the resistance of the unit length of this aerial condutor is invariable, under the constant condition of electric current, by formula P=I
2R as can be known, its power is kept constant, and the caloric value that is to say lead is kept invariable, when meeting with strong snowfall, sleet weather, simultaneously under the little situation of electric load, can on aerial condutor, form and hang frost, icing and icicle, even form thicker ice cover, strengthen the own wt of aerial condutor on the surface of aerial condutor, cause broken string or shaft tower to fracture, interrupt transmission of electricity, make troubles, also bring about great losses to country to people's lives.At the beginning of 2008, high wind snow, sleet disaster that China south meets with, its economic loss reaches and exceeds 100 billion, largely be because the transmission line malfunction of high voltage overhead lead causes, therefore, under ice and snow, sleet weather condition, in time to aerial condutor defrost, deicing, prevent that its surface from freezing, just seeming is even more important.At present, solve or prevent that ice trouble from having two kinds of technological approaches from the angle of aerial condutor: the one, prevent to freeze; The 2nd, adopt an effective measure and carry out deicing.Obviously, preventing to freeze is a kind ofly initiatively to prevent the ice trouble measure, and deicing is a kind of passive anti-ice trouble measure.Take the initiative and prevent the ice trouble technology, i.e. design has the aerial condutor of icing protection, technology in this respect mainly contains following several: 1, development has hydrophobic coating, be coated in the aerial condutor surface, but the technical barrier that this technology exists the low and hydrophobic performance instability of the coating intensity of coating and lead etc. thoroughly to solve as yet also has big gap in the engineering practical application; 2, adopt the aerial condutor of special construction, lead is not regular circle, but has certain wedge angle at outermost one or more strands of aluminium single lines, be in contact with it the little and icing difficulty of face at sharp corner owing to water, but be difficult to play anti-icing effect for strong snowfall, strong sleet, also do not obtain practical application; 3, outside aerial condutor around one or more strands of low Curie temperature alloys, when temperature is low, alloy material has higher magnetic property, the magnetic eddy current loss heating frame hollow wire that induction by current produced that flows through by lead freezes preventing, but it is still higher to prepare the Curie point that hangs down the Curie temperature alloy at present, reaches 20 ℃ Celsius, far above freezing temperature, to produce a large amount of energy losses like this, low simultaneously Curie temperature cost of alloy is higher, has also limited this The Application of Technology.Passive deicing technology comprises that machinery impacts the deicing technology and electrical equipment heats two kinds of deicing technology: machinery impacts the deicing technology and might cause the aerial condutor mechanical damage, reduce the aerial condutor life-span, generally should avoid as far as possible adopting; One of electrical equipment deicing technology is to adopt steel core and the aerial condutor of aluminium stranded conductor with the crosslinked polyetylene insulated special construction that separates of one deck, when carrying out the deicing operation, by switch control the aerial condutor operating current is all flow through by steel core, because steel core resistance is big, electric energy loss on the unit length is big, thereby plays the effect of heating deicing; Two of electrical equipment deicing technology is under the condition that has a power failure, utilize generator movably to provide to exchange or DC power supply heats the deicing operation to a certain section of the aerial condutor that frozen, because the restriction of aerial condutor circuit geographical conditions, it is very difficult carrying heavy power supply, has also limited this The Application of Technology.
Summary of the invention
The object of the present invention is to provide a kind of can be according to the actual conditions of weather, in the time may ice hazard occurring, by the energising cross section of Artificial Control or Based Intelligent Control change aerial condutor, thereby the heating power of unit of adjustment's length improves the self-heating freezing-proof overhead conductor of conductor temperature to prevent to freeze.
For reaching above purpose, the technical solution adopted in the present invention is: this self-heating freezing-proof overhead conductor, constitute by core, stranded conductor, core adopts galvanized steel wire, plays the tension effect, and stranded conductor is stranded in the outside of core, be aluminum conductor, can select the energising sectional area of this aerial condutor according to the requirement of transmission of electricity, the layer that it is characterized in that stranded conductor with layer between be provided with insulating barrier, utilize insulating barrier with the stranded conductor layering.Design principle of the present invention is: adopt insulating barrier to separate stranded conductor, and take into full account the size of its line loss and ampacity, when ice and snow weather occurring, can utilize the separation stranded conductor to change its energising sectional area, thereby realization self-heating, reach the purpose that prevents icing, its computing formula is: P=I
2R, P is a power in the formula, represents caloric value; I is an ampacity, the electric current of representing link tester to cross; R is a conductor resistance, and change that can be artificial when ice and snow occurring, can be changed from small to big R, and under the constant situation of electric current, it is big that P becomes, and realizes self-heating.The present invention also implements by following measure: described insulating barrier is established the 1-2 layer, employing is insulated, and band is wrapped to form, its thickness is the 0.3-0.5 millimeter, so that stranded conductor is divided into layer 2-3, the performance of insulation band should be selected according to the highest heating temp and the long-time running operational environment thereof of self-heating freezing-proof overhead conductor, general polyester band or poly-tetrafluoro band or the similar insulation band of adopting, and the insulation band puncture, perforation and short circuit phenomenon can not occur in making wrapped process.Use when of the present invention, according to the law of resistance: R=ρ l/s, the cross-sectional area s of resistance R and institute's electrified wire is inversely proportional to, because insulating barrier is with the stranded conductor layering, thereby on an aerial condutor, form a plurality of resistance values, in the transmission of electricity process, can select different resistance values to transmit electricity, thereby produce different caloric values as required, when running into Changes in weather, when occurring freezing on the aerial condutor, can only select the stranded conductor of insulating barrier outside to carry electricity, the stranded conductor of insulating barrier inside is not bothered to see me out, under the constant situation of electric current, because carry the cross-sectional area of electricity to diminish relatively, conductive resistance increases relatively, caloric value increases, make the aerial condutor surface temperature be higher than zero degrees celsius, prevent to freeze.
Beneficial effect of the present invention is: compare with the aerial condutor of present use, owing to can make the aerial condutor heating by changing the energising sectional area, remove the lip-deep layers of ice of aerial condutor so can heat automatically, ensure transmission of electricity safety, simultaneously, simple in structure, the manpower and materials of saving line upkeep, reduce the line upkeep expense, can be widely used in the above electric power transfer of 35kV.
Description of drawings
Fig. 1 analyses and observe enlarged diagram for structure of the present invention cross section.
Enlarged diagram is analysed and observe in structure cross section when Fig. 2 is 3 layers for stranded conductor of the present invention.
Fig. 3 is the wiring schematic diagram of stable state temperature rise simulated experiment under the cryogenic conditions of the present invention.
Fig. 4 is the low temperature of the present invention wiring schematic diagram of simulated experiment of freezing of drenching with rain.
Embodiment
Make the present invention with reference to accompanying drawing 1 with one deck insulation layer structure.This self-heating freezing-proof overhead conductor is made of core 1, stranded conductor 2, and core 1 adopts galvanized steel wire, and stranded conductor 2 is stranded in the outside of core 1, is aluminum conductor, is provided with insulating barrier 3 between the layer of stranded conductor 2 and the layer.Described insulating barrier 3 is established 1 layer, and employing is insulated, and band is wrapped to form, and its thickness is 0.3mm.
Below in conjunction with experimental data automatic heats of the present invention is described: adopt lead nominal cross 185/45mm
2Concrete structure is: steel core 7/2.62, aluminium stranded conductor 12/2.62+18/2.92, the thickness of the insulating barrier between the adjacent two layers aluminium stranded conductor is 0.3mm, aluminium stranded conductor from inside to outside is divided into internal layer and skin, change the access way of aerial condutor of the present invention, be divided into all-pass, internal layer is logical, outer logical three kinds of modes, compare with the aerial condutor of the specification of the same race of present use, weight does not have significant change, production cost changes little, thoroughly does away with between the edge hack lever 6 two and sets up aerial condutor 7, aerial condutor 7 and high-current supply 4, tong-type ammeter 5 is connected, the length of c-a and b-d is all greater than 5 meters on the aerial condutor 7, between a-b, get five temperature observation points respectively, switch on after 40 minutes, the mean value of these five temperature observation points is compared.
Test 1: stable state temperature rise simulated experiment under the cryogenic conditions
Carry out wiring by accompanying drawing 3, experiment condition is: ambient temperature is subzero 10 ℃, and electrical current is 130A.Change the access way of aerial condutor, the temperature-averaging value of testing jig hollow wire.
Test result is as follows:
| The mode of connection | The temperature-averaging value |
| All-pass | -5.4℃ |
| Internal layer is logical | +5.3℃ |
| Outer logical | -2.0℃ |
By above simulated experiment as can be known: when aerial condutor is being lower than under the rated capacity, when ambient temperature was low, the aerial condutor temperature can be lower than zero degree, has icing possibility; Simultaneously, also as can be seen, can reach about 10 ℃ by adjusting the scope of the energising cross section being adjusted by the temperature of aerial condutor.
Test 2: the low temperature icing simulated experiment of drenching with rain
Carry out wiring by accompanying drawing 4, ambient temperature is subzero 10 ℃, and electrical current is 200A, is provided with sprinkling equipment 8 above aerial condutor 7, so that aerial condutor 7 is sprayed 0 ℃ water.Change the access way of aerial condutor, the temperature-averaging value of testing jig hollow wire, and observe the situation of freezing.
Test result is as follows:
| The mode of connection | The temperature-averaging value | The situation of freezing |
| All-pass | -2.5℃ | Occur freezing, the thickness that freezes increased with the time of drenching with rain |
| Internal layer is logical | 0℃ | A small amount of freezing occur, the thickness that freezes increases not obvious |
| Outer logical | 10℃ | There is not the phenomenon of freezing |
By above-mentioned simulated experiment as can be known: when aerial condutor is being lower than under the rated capacity, ambient temperature is lower and when drenching with rain is arranged, and the aerial condutor temperature is lower, can occur freezing, but can prevent effectively that by adjusting the energising cross section aerial condutor surface from freezing.
Make the present invention with reference to accompanying drawing 2 with dielectric layers structure.This self-heating freezing-proof overhead conductor is made of core 1, stranded conductor 2, and core 1 adopts galvanized steel wire, and stranded conductor 2 is stranded in the outside of core 1, is aluminum conductor, is provided with insulating barrier 3 between the layer of stranded conductor 2 and the layer.Described insulating barrier 3 is established 2 layers, and employing is insulated, and band is wrapped to form, and its thickness is 0.3mm.
Below in conjunction with experimental data automatic heats of the present invention is described: adopt lead nominal cross 300/35mm
2Concrete structure is: steel core 7/2.50, aluminium stranded conductor 12/2.50+18/2.62+24/2.75, the thickness of the insulating barrier between the adjacent two layers aluminium stranded conductor is 0.3mm, aluminium stranded conductor from inside to outside is divided into ground floor, the second layer, the 3rd layer, change the access way of aerial condutor of the present invention, be divided into all-pass, ground floor is logical, the second layer is logical, the 3rd layer logical, first and second layers logical, second and the 3rd layer logical, first and the 3rd layer of seven kinds of mode in all, compare with the aerial condutor of the specification of the same race of present use, weight does not have significant change, production cost changes little, between two eradication edge hack levers 6, set up aerial condutor 7, aerial condutor 7 and high-current supply 4, tong-type ammeter 5 is connected, the length of c-a and b-d is all greater than 5 meters on the aerial condutor 7, between a-b, get five temperature observation points respectively, switch on after 40 minutes, the mean value of these five temperature observation points is compared.
Test 3: stable state temperature rise simulated experiment under the cryogenic conditions
Carry out wiring by accompanying drawing 3, experiment condition is: ambient temperature is subzero 10 ℃, and electrical current is 200A.Change the access way of aerial condutor, the temperature-averaging value of testing jig hollow wire.
Test result is as follows:
| The mode of connection | The temperature-averaging value |
| All-pass | -5.0℃ |
| Ground floor is logical | +20.3℃ |
| The second layer is logical | +8.0℃ |
| The 3rd layer logical | +2.5℃ |
| First and second layers logical | +1.2℃ |
| Second and the 3rd layer logical | -2.5℃ |
| First and the 3rd layer logical | -1.2℃ |
By above simulated experiment as can be known: when aerial condutor is being lower than under the rated capacity, when ambient temperature was low, the aerial condutor temperature can be lower than zero degree, has icing possibility; Simultaneously, also as can be seen, can reach about 25 ℃ by adjusting the scope of the energising cross section being adjusted by the temperature of aerial condutor.
Test 4: the low temperature icing simulated experiment of drenching with rain
Carry out wiring by accompanying drawing 4, experimental condition is: ambient temperature is subzero 10 ℃, and electrical current is 300A, is provided with sprinkling equipment 8 above aerial condutor 7, so that aerial condutor 7 is sprayed 0 ℃ water.Change the access way of aerial condutor, the temperature-averaging value of testing jig hollow wire, and observe the situation of freezing.
Test result is as follows:
| The mode of connection | The temperature-averaging value | The situation of freezing |
| All-pass | -6.5℃ | Occur freezing, the thickness that freezes increased with the time of drenching with rain |
| Ground floor is logical | +30.0℃ | There is not the phenomenon of freezing |
| The second layer is logical | +15.6℃ | There is not the phenomenon of freezing |
| The 3rd layer logical | +5.2℃ | There is not the phenomenon of freezing |
| First and second layers logical | +2.1℃ | There is not the phenomenon of freezing |
| Second and the 3rd layer logical | 0℃ | A small amount of freezing occur, the thickness that freezes increases not obvious |
| First and the 3rd layer logical | 0℃ | A small amount of freezing occur, the thickness that freezes increases not obvious |
By above-mentioned simulated experiment as can be known: when aerial condutor is being lower than under the rated capacity, ambient temperature is lower and when drenching with rain is arranged, and the aerial condutor temperature is lower, can occur freezing, but can prevent effectively that by adjusting the energising cross section aerial condutor surface from freezing.
Claims (2)
1. self-heating freezing-proof overhead conductor, constitute by core (1), stranded conductor (2), core (1) adopts galvanized steel wire, stranded conductor (2) is stranded in the outside of core (1), be aluminum conductor, it is characterized in that stranded conductor (2) is 3 layers, be provided with insulating barrier (3) between the layer of stranded conductor (2) and the layer, described insulating barrier (3) is established 2 layers.
2. self-heating freezing-proof overhead conductor according to claim 1, band is wrapped to form to it is characterized in that insulating described insulating barrier (3) employing, and its thickness is the 0.3-0.5 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100163427A CN101303917B (en) | 2008-05-22 | 2008-05-22 | Self-heating freezing-proof overhead conductor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100163427A CN101303917B (en) | 2008-05-22 | 2008-05-22 | Self-heating freezing-proof overhead conductor |
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| Publication Number | Publication Date |
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| CN101303917A CN101303917A (en) | 2008-11-12 |
| CN101303917B true CN101303917B (en) | 2010-12-01 |
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| CN2008100163427A Active CN101303917B (en) | 2008-05-22 | 2008-05-22 | Self-heating freezing-proof overhead conductor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102360610B (en) * | 2011-09-14 | 2014-02-26 | 湖南金杯电缆有限公司 | Ice-melting type overhead earth wire |
| CN103337295A (en) * | 2013-05-23 | 2013-10-02 | 国家电网公司 | Transmission line to prevent snow and ice disaster |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6518497B1 (en) * | 2002-06-07 | 2003-02-11 | Allaire Marc-Andre | Method and apparatus for breaking ice accretions on an aerial cable |
| CN2650299Y (en) * | 2003-08-29 | 2004-10-20 | 新疆特变电工股份有限公司 | Low-loss power cable |
| CN201163549Y (en) * | 2008-03-14 | 2008-12-10 | 王金钉 | Controllable temperature rising steel aluminum cable steel reinforced |
| CN201194177Y (en) * | 2008-05-22 | 2009-02-11 | 山东科虹线缆有限公司 | Self-heating freezing-proof overhead conductor |
-
2008
- 2008-05-22 CN CN2008100163427A patent/CN101303917B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6518497B1 (en) * | 2002-06-07 | 2003-02-11 | Allaire Marc-Andre | Method and apparatus for breaking ice accretions on an aerial cable |
| CN2650299Y (en) * | 2003-08-29 | 2004-10-20 | 新疆特变电工股份有限公司 | Low-loss power cable |
| CN201163549Y (en) * | 2008-03-14 | 2008-12-10 | 王金钉 | Controllable temperature rising steel aluminum cable steel reinforced |
| CN201194177Y (en) * | 2008-05-22 | 2009-02-11 | 山东科虹线缆有限公司 | Self-heating freezing-proof overhead conductor |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2006-196375A 2006.07.27 |
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| CN101303917A (en) | 2008-11-12 |
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Owner name: SHANDONG KEHONG WIRE + CABLE TECHNOLOGY CO., LTD. Free format text: FORMER NAME: SHANDONG KEHONG WIRE + CABLE CO., LTD. |
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Address after: 271110, Shandong province Laiwu city and the township government resident Shandong branch hung Cable Co., Ltd. Patentee after: SHANDONG KEHONG WIRE & CABLE TECHNOLOGY Co.,Ltd. Address before: 271110, Shandong province Laiwu city and the township government resident Shandong branch hung Cable Co., Ltd. Patentee before: SHANDONG KEHONG WIRE & CABLE Co.,Ltd. |
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Address after: 271110 Residence of Laiwu District and Zhuangzhen Town, Jinan City, Shandong Province Patentee after: Shandong Zhengtai Cable Co.,Ltd. Address before: 271110 Residence of Hezhuang Town and Laicheng District, Laiwu City, Shandong Province Patentee before: SHANDONG KEHONG WIRE & CABLE TECHNOLOGY CO.,LTD. Address after: 271110 Residence of Hezhuang Town and Laicheng District, Laiwu City, Shandong Province Patentee after: SHANDONG KEHONG WIRE & CABLE TECHNOLOGY CO.,LTD. Address before: 271110, Shandong province Laiwu city and the township government resident Shandong branch hung Cable Co., Ltd. Patentee before: SHANDONG KEHONG WIRE & CABLE TECHNOLOGY Co.,Ltd. |
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Denomination of invention: Self heating anti icing overhead conductor Effective date of registration: 20230627 Granted publication date: 20101201 Pledgee: Laishang Bank Co.,Ltd. Changzheng Branch Pledgor: Shandong Zhengtai Cable Co.,Ltd. Registration number: Y2023980045814 |