CN100568404C - Waterproof power cable and manufacture method - Google Patents
Waterproof power cable and manufacture method Download PDFInfo
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- CN100568404C CN100568404C CNB2007100407893A CN200710040789A CN100568404C CN 100568404 C CN100568404 C CN 100568404C CN B2007100407893 A CNB2007100407893 A CN B2007100407893A CN 200710040789 A CN200710040789 A CN 200710040789A CN 100568404 C CN100568404 C CN 100568404C
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Abstract
The present invention relates to a kind of waterproof power cable, it is characterized in that 1. described waterproof power cable is by three single cores cable twisting stranding that blocks water; 2. every single core blocks water cable from the inside to surface successively by conductor, the bisque that blocks water, screen, insulating barrier, and insulation screen, semiconductor waterstop I, metal screen layer, semiconductor waterstop II, water blocking layer and external sheath layer constitute.Smear water-proofing powder in the stranded rear surface of circular oxygen-free copper conductor compacting, waterstop I and II extrude polyethylene simultaneously for vertical alclad plastic composite strip.The power cable that provides meets the relevant requirements of GB/T12706.2, and peeling force is not less than 1.2N/mm between aluminium-plastic tape and polyethylene oversheath, charges into 50-100Pa dry air or nitrogen post-equalization 6 hours, and arbitrary end air pressure of cable does not descend.Demonstrate good radially water preventing ability.
Description
Technical field
The present invention relates to waterproof power cable and manufacture method, belong to field of cables.
Background technology
After finding crosslinked polyethylene (XLPE) insulation water tree aging in 1967, confirmed that it becomes one of aging main phenomenon of XLPE cable at present.
Though the mechanism of water tree and how to cause that destruction still imperfectly understands at present, great number tested data show water tree and can cause local stress to increase, may become the cradle of electric branch.Under the high temperature, in the water tree significant oxidation may take place, cause water absorption to increase, conductivity increases, final thermal breakdown; Even at low temperatures, water tree is through the long period oxidation or be converted into electric branch, also can cause the destruction of insulation.Particularly when the cable long period of soaking is in water, if there is not good waterproof construction, more to be easy to generate the water tree of insulation aging for cable so, thereby the destruction of causing insulation will be shortened life-span of cable so greatly.Cable so be laid in the water environment generally all needs cable to have waterproof construction.
Waterproof requirement to power cable also just grew up in recent years, and the requirement to waterproof in the past mainly is limited in the application of submarine cable, extra-high-tension cable and telecommunication cable.Along with insulation being absorbed water and the research of water tree and the intensification of understanding, people more and more recognize the importance of water resistance centering high voltage power cable.Higher or the long-term rainy area in level of ground water, increasing user has proposed the requirement of waterproof to cable.
Traditional water-proof cable in the stranding process in order to make cable have fire resistance characteristic, all in the space of stranding, fill a large amount of waterproofing rope, waterproofing rope costs an arm and a leg, and this structure not only makes the cost of cable significantly increase, and vertical block-water performance instability of cable.
Summary of the invention
The object of the present invention is to provide a kind of waterproof power cable and manufacture method.
As mentioned above, traditional water-proof cable in order to make cable have fire resistance characteristic, is all filled a large amount of waterproofing rope in the space of stranding in the stranding process, waterproofing rope costs an arm and a leg, this structure not only makes the cost of cable significantly increase, and vertical block-water performance instability of cable.The present invention is by the appropriate design construction of cable, make single-core cable have good block-water performance, the waterproof power cable that provides is by adopting three single cores cable twisting stranding that blocks water, reach the multicore purpose that blocks water, design certain twisting pitch simultaneously, make cable have stability preferably, the cable that blocks water so just avoids adopting waterproofing rope, do not increase simultaneously other material water-proof material, and the block-water performance of cable is better, make cable not only reduce existing production cost, and cable is because the good heat dissipation ampacity also increase many.It is a kind of ideal cheaply cable that blocks water.
Waterproof power cable provided by the present invention is by three single cores cable twisting stranding that blocks water, as shown in Figure 1, every single core cable that blocks water is made of conductor, water-proofing powder, conductor shield, insulating barrier, insulation screen, semiconductor waterstop I, metal screen layer, semiconductor waterstop II, water blocking layer and outer jacket cover from the inside to surface successively.
Wherein: conductor adopts the 2nd kind of layering of GB/T3956 regulation to press stranded round conductor, and the degree of pressing of conductor reaches more than 90%, and roundness reaches more than 98%, and conductive surface is bright and clean, no burr, cut.Water-proofing powder need be smeared in every layer of compact conductor surface, makes conductor have vertical water stop function.
Conductor screen is made up of the semi-conducting material that extrudes, and eliminates the electric field of conductive surface and concentrates, and improves cable work field intensity.
Insulating barrier is made up of the XLPE that extrudes, and uses ultra-clean level XLPE material, and insulation is extruded in outside the conductor screen, and the insulation nominal thickness meets the corresponding standard regulation, guarantees the dielectric voltage withstand performance of cable.
Insulation screen is made up of the semiconductive material that extrudes, and is extruded on the insulating barrier, plays the uniform electric field effect.
Metal screen layer is made up of copper strips, has the effect of earth shield, conducting capacitance current and short circuit current.At all wrapped semiconductive waterstop in the inside and outside surface of metallic shield, make cable have good vertical block-water performance.
Water blocking layer extrudes poly vertical pack arrangement simultaneously with vertical alclad plastic composite strip, plays radially waterproof action.
Cable jacket is made up of PVC or PE.Oversheath is generally black except that specific (special) requirements, make cable have good weather resisteant energy.
The manufacture craft of waterproof power cable provided by the invention is:
1. conductor adopts layering to press method, and every laminar surface is smeared water-proofing powder;
2. adopt catenary suspension type continuous vulcanization dry method chemical crosslinking production line to extrude conductor, screen, insulating barrier, insulation screen simultaneously;
3. at the insulated wire cores surface wrapped layer of semiconductor waterstop I of elder generation, wrapped again one deck soft copper band again at the wrapped two layers of semiconductor waterstop II of the outer surface of soft copper band, forms metal screen layer;
4. adopt two-sided aluminium-plastic tape to extrude polyethylene simultaneously and combine jacket making water blocking layer;
5. oversheath adopts polyvinyl chloride or polyethylene;
6. the last stranded cabling process of single core finished product three cores that adopts, stranded lay ratio is not more than 25.
Waterproof power cable major advantage provided by the invention is that described water-proof cable avoids adopting traditional waterproofing rope, and do not use other material water-proof material again and the block-water performance of cable is better, cost is not only reduced and also cable since the good heat dissipation ampacity also obviously increase.
The key technical indexes of waterproof power cable provided by the invention is:
1, general characteristic index: meet the GB/T12706.2 standard-required.
2, vertical water blocking test index: meet the water permeabillity test requirement of GB/T12706.2 appendix D regulation.
3, the indirect performance assessment criteria of water blocking test radially:
(1), disbonded test: be not less than 1.2N/mm between aluminium-plastic tape and polyethylene oversheath; Vertical alclad plastic composite strip lap is not less than 1.2N/mm.
(2), air test: charged into 50～100Pa dry air or nitrogen post-equalization 6 hours, the arbitrary end air pressure of cable does not descend.
Description of drawings
Fig. 1 is the structural representation of waterproof power cable provided by the invention.
Among the figure: 1 conductor, 2 water-proofing powders, 3 conductor shields, 4 insulating barriers, 5 insulation screens, 6 semiconductor waterstop I, 7 metal screen layers, 8 semiconductor waterstop II, 9 water blocking layers, 10 outer jackets
Embodiment
By following embodiment, further illustrate substantive distinguishing features of the present invention and obvious improvement, but the present invention only is confined to embodiment by no means.
The described waterproof power cable of present embodiment as shown in Figure 1, it is by three single cores cable twisting stranding that blocks water, and every single core cable that blocks water covers layer, semiconductor waterstop I, metal screen layer, semiconductor waterstop II, water blocking layer and outer jacket by conductor, water-proofing powder, conductor shield, insulating barrier, insulating barrier successively from inside to outside and constitutes.
1, conductor:
Adopt copper free wire, meet the 2 class conductor structure requirements of stipulating in the GB/T3956 standard.Conductor adopts layering to press structure, and every laminar surface need be smeared water-proofing powder, to guarantee the block-water performance of cable conductor.
2, three-layer co-extruded:
Adopt catenary suspension type continuous vulcanization dry method chemical crosslinking production line to extrude conductor shield, insulating barrier, insulation screen simultaneously, guarantee the insulation property of cable, the insulation standard thickness meets the requirement of GB/T12706.2 standard.
3, metal screen layer:
At the thick semiconductive waterstop I of the insulated wire cores surface wrapped one deck 0.2mm of elder generation, the soft copper band that wrapped again one deck 0.12mm is thick is again at the thick semiconductor waterstop II of the wrapped two layers of 0.2mm of the outer surface of soft copper band, to guarantee vertical block-water performance of cable.
4, water blocking layer:
Adopt the thick two-sided aluminium-plastic tape+polyethylene of 0.2mm to combine jacket technology, guarantee radially block-water performance of cable.
5, external sheath layer:
Adopt polyvinyl chloride or polyethylene sheath material, its standard thickness should meet the requirement of GB/T12706.2 standard.
6, stranded:
Adopt single core finished product water-proof cable three core strandings, control certain twisting pitch band directly than being not more than 25, to guarantee the stability of cable.
Claims (4)
1, a kind of manufacture method of waterproof power cable, described waterproof power cable is by three single cores cable twisting stranding that blocks water; Every single core blocks water cable from the inside to surface successively by conductor, the bisque that blocks water, screen, insulating barrier, and insulation screen, semiconductor waterstop I, metal screen layer, semiconductor waterstop II, water blocking layer and external sheath layer constitute, and it is characterized in that:
1. conductor adopts layering to press method, and every laminar surface is smeared water-proofing powder;
2. adopt catenary suspension type continuous vulcanization dry method chemical crosslinking production line to extrude conductor, screen, insulating barrier, insulation screen simultaneously;
3. at the insulated wire cores surface wrapped layer of semiconductor waterstop I of elder generation, wrapped again one deck soft copper band forms metal screen layer, again at the wrapped two layers of semiconductor waterstop II of the outer surface of soft copper band;
4. adopt two-sided aluminium-plastic tape to extrude the vertical jacket of polyethylene simultaneously and make water blocking layer;
5. oversheath adopts polyvinyl chloride or polyethylene;
6. the last stranded cabling process of single core finished product three cores that adopts, stranded lay ratio is not more than 25.
2, by the manufacture method of the described waterproof power cable of claim 1, it is characterized in that insulating barrier standard thickness and oversheath nominal thickness meet the requirement of GB/T12706.2 standard.
3, by the manufacture method of the described waterproof power cable of claim 1, it is characterized in that the thickness of semiconductor waterstop I and II is respectively 0.2mm.
4, by the manufacture method of the described waterproof power cable of claim 1, it is characterized in that described water blocking layer thickness is 0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100407893A CN100568404C (en) | 2007-05-17 | 2007-05-17 | Waterproof power cable and manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100407893A CN100568404C (en) | 2007-05-17 | 2007-05-17 | Waterproof power cable and manufacture method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101071658A CN101071658A (en) | 2007-11-14 |
| CN100568404C true CN100568404C (en) | 2009-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100407893A Expired - Fee Related CN100568404C (en) | 2007-05-17 | 2007-05-17 | Waterproof power cable and manufacture method |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101204694B (en) * | 2007-12-10 | 2010-04-14 | 浙江万马电缆股份有限公司 | Cable impervious layer electrostatic painting method |
| CN102347108A (en) * | 2010-08-04 | 2012-02-08 | 北京市电力公司 | 10 kilovolt (KV) single-core stranded cluster crosslinking polyethylene insulation flame retardation power cable |
| CN102789835A (en) * | 2011-08-12 | 2012-11-21 | 上海特种电线电缆（集团）有限公司 | Environment-friendly safe waterproof fireproof cable |
| CN102881379A (en) * | 2012-10-18 | 2013-01-16 | 江苏荣宜电缆有限公司 | Waterproof power cable |
| CN103077777A (en) * | 2012-11-14 | 2013-05-01 | 湖北龙腾红旗电缆(集团)有限公司 | Rat-proof and termite-proof coaxial cable for grounding ultra-high voltage transmission line |
| CN103035337A (en) * | 2012-11-26 | 2013-04-10 | 晶锋集团股份有限公司 | Waterproof electric power cable and manufacturing method thereof |
| CN102969090B (en) * | 2012-12-04 | 2015-04-29 | 汕头市金桥电缆有限公司 | Manufacturing method of communication cable |
| CN103886987A (en) * | 2014-04-08 | 2014-06-25 | 江西联创电缆科技有限公司 | Water blocking type bunched cable for smart antenna |
| CN104575840B (en) * | 2015-01-07 | 2016-12-07 | 安徽弘博电缆集团有限公司 | A kind of waterproofing type power cable with cross-linked polyethylene insulation |
| CN105632605B (en) * | 2016-04-05 | 2018-08-14 | 江苏亨通高压海缆有限公司 | Preparation method of waterproof submarine cable |
| CN107610833B (en) * | 2017-09-27 | 2023-05-12 | 江苏亨通高压海缆有限公司 | Conductor water-blocking device |
| CN113362986B (en) * | 2021-06-16 | 2022-03-15 | 广东中宝电缆有限公司 | Single-core waterproof B1-grade flame-retardant fire-resistant cable for rail transit and preparation method thereof |
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2007
- 2007-05-17 CN CNB2007100407893A patent/CN100568404C/en not_active Expired - Fee Related
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| CN101071658A (en) | 2007-11-14 |
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