CN101071658A - Waterproof power cable and its manufacturing method - Google Patents

Waterproof power cable and its manufacturing method Download PDF

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Publication number
CN101071658A
CN101071658A CN 200710040789 CN200710040789A CN101071658A CN 101071658 A CN101071658 A CN 101071658A CN 200710040789 CN200710040789 CN 200710040789 CN 200710040789 A CN200710040789 A CN 200710040789A CN 101071658 A CN101071658 A CN 101071658A
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China
Prior art keywords
cable
power cable
water
waterproof power
water blocking
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Granted
Application number
CN 200710040789
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Chinese (zh)
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CN100568404C (en
Inventor
计初喜
鲁邦秀
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SHANGHAI YALONG INDUSTRY GROUP Co Ltd
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SHANGHAI YALONG INDUSTRY GROUP Co Ltd
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Priority to CNB2007100407893A priority Critical patent/CN100568404C/en
Publication of CN101071658A publication Critical patent/CN101071658A/en
Application granted granted Critical
Publication of CN100568404C publication Critical patent/CN100568404C/en
Expired - Fee Related legal-status Critical Current
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Abstract

This invention involves a waterproof electrical cables, its features are: (1) waterproof referred to by the three power cables cable cutter water blocking synthesis of single-core cables; (2) each from the single-core cables, water blocking, followed by the conductor, water blocking layer powder , shielding layer, insulating layer, insulated shielding layer, with water blocking I semiconductor, metal shielding layer, with water blocking II semiconductor, water blocking layer and the outer sheathing layer composition. Oxygen-free copper conductors in the round are pressed and intertwisted, and then the surface of which is coated with waterproof powder, water blocking zone I and II packages for vertical band of aluminum-plastic composites at the same time squeezing packets polyethylene. Power cable provided with GB/T12706.2 the relevant requirements, and the aluminum-plastic composites with polyethylene, and stripping of the sheath of not less than 1.2 N/mm, charging to 50-100 Pa after dry air or nitrogen balance six hours, one end of the cable, not the air pressure drop.

Description

Waterproof power cable and manufacture method
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 (9)

1, a kind of waterproof power cable 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.
2, by the described waterproof power cable of claim 1, it is characterized in that described conductor is a copper free wire, stranded round conductor is pressed in layering, and water-proofing powder is smeared on the surface.
3, by the described waterproof power cable of claim 1, it is characterized in that insulating barrier is the crosslinked polyethylene that extrudes.
4,, it is characterized in that waterstop I and II structure extrude polyethylene simultaneously for vertical alclad plastic composite strip by the described waterproof power cable of claim 1.
5, by the described waterproof power cable of claim 2, it is characterized in that the degree of pressing of described round conductor reaches more than 90%, roundness reaches more than 98%.
6, making is characterized in that as the method for each described waterproof power cable of claim 1-5:
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.
7, by the manufacture method of the described waterproof power cable of claim 6, it is characterized in that insulating barrier standard thickness and oversheath nominal thickness meet the requirement of GB/T12706.2 standard.
8, by the manufacture method of the described waterproof power cable of claim 6, it is characterized in that the thickness of semiconductor waterstop I and II is respectively 0.2mm.
9, by the manufacture method of the described waterproof power cable of claim 6, it is characterized in that described water blocking layer thickness is 0.2mm.
CNB2007100407893A 2007-05-17 2007-05-17 Waterproof power cable and manufacture method Expired - Fee Related CN100568404C (en)

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)

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CN101071658A true CN101071658A (en) 2007-11-14
CN100568404C CN100568404C (en) 2009-12-09

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Cited By (11)

* Cited by examiner, † Cited by third party
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
CN102969090A (en) * 2012-12-04 2013-03-13 汕头市金桥电缆有限公司 Manufacturing method of communication cable
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
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
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
CN104575840A (en) * 2015-01-07 2015-04-29 安徽弘博电缆集团有限公司 Water blocking type crosslinking polyethylene insulating power cable
CN105632605A (en) * 2016-04-05 2016-06-01 江苏亨通高压电缆有限公司 Efficient waterproof submarine cable preparation method
CN113362986A (en) * 2021-06-16 2021-09-07 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

Cited By (13)

* Cited by examiner, † Cited by third party
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
CN102969090A (en) * 2012-12-04 2013-03-13 汕头市金桥电缆有限公司 Manufacturing method of communication cable
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
CN104575840A (en) * 2015-01-07 2015-04-29 安徽弘博电缆集团有限公司 Water blocking type crosslinking polyethylene insulating power cable
CN105632605A (en) * 2016-04-05 2016-06-01 江苏亨通高压电缆有限公司 Efficient waterproof submarine cable preparation method
CN105632605B (en) * 2016-04-05 2018-08-14 江苏亨通高压海缆有限公司 A kind of preparation method of waterproof submarine cable
CN113362986A (en) * 2021-06-16 2021-09-07 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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