CN102915809B - Power cable is amassed in the heavy in section of radially layered stranded conductor - Google Patents
Power cable is amassed in the heavy in section of radially layered stranded conductor Download PDFInfo
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- CN102915809B CN102915809B CN201110224801.2A CN201110224801A CN102915809B CN 102915809 B CN102915809 B CN 102915809B CN 201110224801 A CN201110224801 A CN 201110224801A CN 102915809 B CN102915809 B CN 102915809B
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Abstract
Power cable is amassed in the heavy in section of radially layered stranded conductor of the present invention, comprise the conductor of circular cross-section, conductor is divided into inside and outside two-layer along radial direction, skin is outer shroud conductor, conductor centered by internal layer, between outer shroud conductor and center conductor, arrange the first insulating barrier, center conductor forms by multiple sector element is stranded, arranges the second insulating barrier between adjacent two sector elements; Outer shroud conductor forms by multiple fan annular stock block is stranded, arranges the 3rd insulating barrier between adjacent two annular stock blocks of fan, and each sector element and each fan annular stock block are formed by many single metal wires.Power cable is amassed in the heavy in section of radially layered stranded conductor of the present invention, by adding the first insulating barrier, improving the current density of conductor middle part, when not increasing conductor, improve the ampacity of power cable, saving conductor material.
Description
Technical field
The present invention relates to a kind of power cable, particularly power cable is amassed in a kind of heavy in section of radially layered stranded conductor.
Background technology
Power cable is generally made up of copper conductor core, insulating barrier, metallic sheath, sheath and serving.The conductor of power cable is generally stranded copper single line and forms, and carries logical current-carrying Core Feature, when its conductor is by alternating current, affects by kelvin effect, and the electric current distribution of conductor is also uneven.Along with the increase of cross-sectional area of conductor, the effect that current density increases from inside to outside is gradually remarkable gradually, and the average current density on conductor unit area reduces gradually, and conductor utilization progressively declines, and its AC resistance increases gradually.China utility model CN2598104Y discloses a kind of big section copper core five milliken conductor, and the stock block that copper core cross section is divided into five to be separated from each other, every personal share interblock arranges insulation crimped paper.Chinese invention CN101620898A discloses a kind of production method of crosslinked polyethylene insulating power cable for ultra-high voltage aluminum core segmental conductor, is obtained by the power cable of five strands of aluminium core stock block twists by the method.Due to the kelvin effect of cable conductor, the electric current distribution of per share conductor is peripheral at it, and the current density of the middle part of per share conductor is just very little, reduces the ampacity of conductor.China utility model CN201408562Y discloses a kind of milliken conductor and copper single line, one deck CuO film is formed at every root copper single wire surface, make every root copper single line as a milliken conductor, reduce kelvin effect, but its complex manufacturing, production efficiency is low, is not suitable for the power cable that heavy in section is long-pending.
Summary of the invention
Power cable is amassed in the heavy in section that problem to be solved by this invention is to provide a kind of radially layered stranded conductor, overcomes the above-mentioned problems in the prior art.
Power cable is amassed in the heavy in section of radially layered stranded conductor of the present invention, comprise the conductor of circular cross-section, described conductor is divided into inside and outside two-layer along radial direction, skin is outer shroud conductor, conductor centered by internal layer, between outer shroud conductor and center conductor, arrange the first insulating barrier, described center conductor forms by multiple sector element is stranded, arranges the second insulating barrier between adjacent two sector elements; Described outer shroud conductor forms by multiple fan annular stock block is stranded, arranges the 3rd insulating barrier between adjacent two annular stock blocks of fan, and each sector element and each fan annular stock block are formed by many single metal wires.
Second insulating barrier of the present invention and the 3rd insulating barrier are insulation crimped paper.
The quantity of fan of the present invention annular stock block is equal with the quantity of sector element.
The quantity of the annular stock block of fan of the present invention is the twice of sector element quantity.
First insulating barrier of the present invention is arranged on the midpoint of described conductor radius, the twice of conductor diameter centered by the external diameter making described outer shroud conductor.
First insulating barrier of the present invention is plastic insulating layer.
The outside of conductor of the present invention is also provided with semi-conductive layer, insulating barrier, semiconductive shielding layer, resilient coating, metallic sheath and serving successively.
By above technical scheme, power cable is amassed in the heavy in section of radially layered stranded conductor of the present invention, by adding one deck first insulating barrier in conductor, when not increasing cross-sectional area of conductor, improve the average current density of conductor middle part, substantially reduce the AC resistance of conductor, improve the current capacity of cable conductor, and simplify the production technology of conductor when processing, improve production efficiency, in cable joint place and end, better operate.In the past, in order to improve the ampacity of cable, this object can only be reached by the sectional area increasing cable conductor, the present invention just can improve its ampacity under the sectional area not increasing cable conductor, so just save a large amount of conductor, not only reduce the cost of cable, and also a saving fossil energy sources, reduction CO2 emission, support low carbon development.
Accompanying drawing explanation
The concrete structure figure of Fig. 1 first embodiment of the invention.
The concrete structure figure of Fig. 2 second embodiment of the invention.
Embodiment
As shown in Figures 1 and 2, power cable is amassed in the heavy in section of radially layered stranded conductor, comprise the conductor 1 of circular cross-section, conductor is divided into inside and outside two-layer along radial direction, skin is outer shroud conductor, and conductor centered by internal layer arranges the first insulating barrier 3 between outer shroud conductor and center conductor, center conductor forms by multiple sector element is stranded, arranges the second insulating barrier between adjacent two sector elements; Outer shroud conductor forms by multiple fan annular stock block is stranded, arranges the 3rd insulating barrier between adjacent two annular stock blocks of fan, and each sector element and each fan annular stock block are formed by many single metal wires.Only conductor need be divided into two-layer by the first insulating barrier, every layer is divided into multiply again, per sharely to form by many single metal wires are stranded, adjacent metal single line can be arranged without the need to insulation by conducting every root single line outer surface, just can reduce the impact of kelvin effect on conductor, improve the average current density of conductor middle part, substantially reduce the AC resistance of conductor, improve the current capacity of cable conductor; Form conductor by layering and simplify production technology, improve production efficiency, be specially adapted to the power cable that heavy in section is long-pending.
A specific embodiment of power cable is amassed in the heavy in section being illustrated in figure 1 radially layered stranded conductor of the present invention, and this power cable is respectively conductor 1, semi-conductive layer 4, insulating barrier 5, semiconductive shielding layer 6, resilient coating 7, metallic sheath 8 and serving 9 from inside to outside.Outer shroud conductor fans the quantity equal with the quantity of center conductor sector element (see Fig. 1) of annular stock block, and the second insulating barrier and the 3rd insulating barrier are insulation crimped paper 2.Now conductor is divided into the conductor stock block of ten pieces little, improves the current density of conductor middle part, reduces the AC resistance of conductor, when not increasing conductor, improves the ampacity of power cable.And when processing, first produce the sector element of center conductor, be easier to because its cross section is little produce, stranded formation center conductor after five pieces of sector elements complete respectively, again the first insulating barrier 3 first outside center conductor, around after again the fan annular stock block produced is stranded in the periphery of the first insulating barrier, form the conductor of power cable with this.Because reduce the sectional area of every personal share block, therefore improve the production efficiency of every personal share block and easily meet technical indicator.The rounding strengthening power cable conductor by twice stranded production improves the current-carrying performance of conductor, and simplifies the production technology that cable conductor is amassed in heavy in section, makes better to operate at cable joint place and end.
Another specific embodiment of power cable is amassed in the heavy in section being illustrated in figure 2 radially layered stranded conductor of the present invention, and the quantity of fanning annular stock block is the twice of sector element quantity.Cable conductor, when shaping, first makes center conductor, is pressed into sector conductor stranded for circular copper single line, and then five sector conductors carry out being twisted into center conductor again, between adjacent two strands of sector elements, be provided with the second insulating barrier; Again add one deck first insulating barrier 3 in the center conductor periphery of making, then stranded shaping fan annular stock block outside it, between the annular stock block of fan, be provided with the 3rd insulating barrier, the second insulating barrier and the 3rd insulating barrier generally adopt insulation crimped paper 2.Owing to having added the first insulating barrier between center conductor and outer shroud conductor, the stock block number of outer shroud conductor can double, and therefore when not increasing conductor, more improve the ampacity ability of cable conductor, saving conductor material.
For the maximum carrying capacity making the ampacity of power cable reach same cross section, first insulating barrier 3 is arranged on the midpoint of conductor radius, the twice of conductor diameter centered by the external diameter making outer shroud conductor, achieve when minimum layering, also maximum anti-kelvin effect can be reached, make power cable reach maximum carrying capacity, and simplify production technology.
First insulating barrier 3 is preferably plastic insulating layer, and plastic insulation is compared with insulating paper, has very high intensity, and its tearing toughness is 300%, and the tearing toughness of insulating paper is about 30%, thus reduces the possibility of damage in insulation; And in technique, plastic insulation can adopt full back twist technique, if and insulating paper can not adopt this full back twist technique because it loses the effect of insulation for this technique can be destroyed, and the benefit of this technique makes cable conductor rounding more exactly, improves the performance of power cable.
Claims (7)
1. power cable is amassed in the heavy in section of a radially layered stranded conductor, comprise the conductor (1) of circular cross-section, it is characterized in that, described conductor (1) is divided into inside and outside two-layer along radial direction, skin is outer shroud conductor, and conductor centered by internal layer arranges the first insulating barrier (3) between outer shroud conductor and center conductor, described center conductor forms by multiple sector element is stranded, arranges the second insulating barrier between adjacent two sector elements; Described outer shroud conductor forms by multiple fan annular stock block is stranded, arranges the 3rd insulating barrier between adjacent two annular stock blocks of fan, and each sector element and each fan annular stock block are formed by many single metal wires; Wherein, the adjacent metal single line mutual conduction in described fan annular stock block and described sector element.
2. power cable is amassed in heavy in section according to claim 1, it is characterized in that, described second insulating barrier and the 3rd insulating barrier are insulation crimped paper (2).
3. power cable is amassed in heavy in section according to claim 1, it is characterized in that, the quantity of described fan annular stock block is equal with the quantity of sector element.
4. power cable is amassed in heavy in section according to claim 1, it is characterized in that, the quantity of the annular stock block of described fan is the twice of sector element quantity.
5. power cable is amassed in heavy in section according to claim 1, it is characterized in that, described first insulating barrier (3) is arranged on the midpoint of described conductor radius, the twice of conductor diameter centered by the external diameter making described outer shroud conductor.
6. power cable is amassed in heavy in section according to claim 1, it is characterized in that, described first insulating barrier (3) is plastic insulating layer.
7. power cable is amassed in heavy in section according to claim 1, it is characterized in that, the outside of described conductor is also provided with semi-conductive layer (4), insulating barrier (5), semiconductive shielding layer (6), resilient coating (7), metallic sheath (8) and serving (9) successively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110224801.2A CN102915809B (en) | 2011-08-05 | 2011-08-05 | Power cable is amassed in the heavy in section of radially layered stranded conductor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110224801.2A CN102915809B (en) | 2011-08-05 | 2011-08-05 | Power cable is amassed in the heavy in section of radially layered stranded conductor |
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| CN102915809A CN102915809A (en) | 2013-02-06 |
| CN102915809B true CN102915809B (en) | 2015-09-30 |
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| CN201110224801.2A Active CN102915809B (en) | 2011-08-05 | 2011-08-05 | Power cable is amassed in the heavy in section of radially layered stranded conductor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105551663A (en) * | 2014-11-04 | 2016-05-04 | 江苏宝安电缆有限公司 | Low-electric-field high-voltage cable |
| CN106571179A (en) * | 2015-10-12 | 2017-04-19 | 江苏宝安电缆有限公司 | Large cross section high current carrying capacity high voltage cable |
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| CN201838381U (en) * | 2010-09-26 | 2011-05-18 | 杭州电缆有限公司 | Overhead insulated cable |
| CN202230796U (en) * | 2011-08-05 | 2012-05-23 | 上海电缆研究所 | Large sectional area power cable of radial layered stranded conductor |
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| CN2277554Y (en) * | 1996-12-30 | 1998-04-01 | 上海摩恩电气有限公司 | Five-core power cable |
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| CN2906841Y (en) * | 2006-06-08 | 2007-05-30 | 江苏远东集团有限公司 | Copper-aluminum composite conductor cable |
| CN201153057Y (en) * | 2008-01-08 | 2008-11-19 | 天津塑力线缆集团有限公司 | 7 divided conductive for electric cable having a cross section larger than 3000 square milimeters |
| CN201242904Y (en) * | 2008-06-27 | 2009-05-20 | 浙江万马电缆股份有限公司 | Cable conductor capable of resisting skin effect |
| CN201622863U (en) * | 2010-02-08 | 2010-11-03 | 天津塑力集团超高压电缆有限公司 | Parting conductor with longitudinal water-proof structure |
| CN201707959U (en) * | 2010-04-16 | 2011-01-12 | 湖北兴和电力新材料股份有限公司 | Split composite screening insulated copper and aluminum tube bus |
| CN201754354U (en) * | 2010-08-10 | 2011-03-02 | 无锡华能电缆有限公司 | Allotype line conductor overhead insulated cable |
| CN201780803U (en) * | 2010-09-02 | 2011-03-30 | 宁波东方电缆股份有限公司 | Conductor structure of large-section high-pressure undersea cable |
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| CN102915809A (en) | 2013-02-06 |
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