CN1730531A - Improved crosslinked polyetylene insulated material and power cable for 6KV and above - Google Patents
Improved crosslinked polyetylene insulated material and power cable for 6KV and above Download PDFInfo
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- CN1730531A CN1730531A CN 200510041399 CN200510041399A CN1730531A CN 1730531 A CN1730531 A CN 1730531A CN 200510041399 CN200510041399 CN 200510041399 CN 200510041399 A CN200510041399 A CN 200510041399A CN 1730531 A CN1730531 A CN 1730531A
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Abstract
The invention relates to an improved crosslinked polyetylene insulated material and power cable for 6KV and above, characterized in that the cable's electric conductor is fine bronze wire stranded soft conductor, the insulation layer comprises 100 parts of crosslinked polyethylene, 15-30 parts of ethylene / vinyl acetate, and 1.5-3 parts of peroxide cross linker modified crosslinked polyethylene. The metallic shield of the insulation screen is braided fine bronze wire, the outer sheath is polyvinylchloride thermal plasticoelastic members. The cable has good bending property and screening performance.
Description
Technical field
The invention relates to the improvement to 6KV and above power cable with cross-linked polyethylene insulation and cross-linked polyethylene insulating material, it is good to relate in particular to a kind of crooked flexibility, 6KV that bending radius is little and above power cable with cross-linked polyethylene insulation.
Background technology
Existing voltage rating is 6KV and above power cable, and its insulation form is divided into three kinds usually.A kind of is oil-impregnated paper insulation, and because of this cable processed complex, the cost height is eliminated substantially; Second kind is ethylene propylene rubber insulated, mainly relies on import but be used for insulating ethylene-propylene rubber(EPR) at present, and the rubber processing complexity, thereby cable cost is higher.The third is crosslinked polyetylene insulated, and such insulated cable accounts for whole 6KV and more than 90% of above power cable amount.Crosslinked polyethylene insulate, and has good insulation preformance, voltage withstand class height, characteristics such as technology is simple, cost is low, and preferably adopted.But shortcoming is that cross-linking polyethylene materials hardness is big, poor flexibility, bending property is poor, and is especially crosslinked polyetylene insulated in the reduction that can cause the insulated electro performance after bending repeatedly, therefore is difficult to make little 6KV of good bending property, bending radius and above power cable.
Secondly, existing 6KV and above power cable, its conductor are to adopt 1,2 thicker class conductors of single diameter, and twisting pitch is big, and twisting pitch is at least 15-25 doubly usually, are difficult for when conductor is crooked producing slippage, are not easy bending; Insulation shielding employing crosslinked polyethylene semi-conductive layer and copper strips are overlapping wrapped; Oversheath adopts the relatively poor polyvinyl chloride of elasticity, these also are the reasons that causes cable bending property difference, therefore present 6KV and above power cable with cross-linked polyethylene insulation, bending radius is all bigger, bending radius generally needs 12 times more than the cable size at least, made troubles to installing, lay, using all, can only be used for fixing and lay occasion, can not be used for the frequent crooked special occasions of needs and use.
Summary of the invention
The present invention's first purpose is to overcome the deficiency of above-mentioned prior art, provides a kind of and can both keep that the high insulating property of crosslinked polyethylene and manufacture craft are simple, low cost and other advantages, can significantly improve the modified crosslinking polyethylene Insulation Material of flexibility and bendability again.
Second purpose of the present invention is to provide a kind of good bandability, and bending radius is little, can be used for 6KV and above power cable with cross-linked polyethylene insulation that frequent crooked special occasions uses.
Through the crosslinked polyethylene modified test is found, by in insulating material of polyethylene, mixing a certain amount of ethene-vinyl acetate copolymer EVA (Ethylene-Vinylacetate Copolymer), can weaken the inferior valency power between the polyethylene molecule, thereby improved the intermolecular resilient movement performance of crosslinked polyethylene, its flexibility is significantly improved, have elasticity preferably at normal temperatures, good bending property does not reduce the good insulated electro performance of crosslinked polyethylene simultaneously again.Specifically, modified crosslinking polyethylene Insulation Material of the present invention is characterized in that by 100 parts of polyethylene, 15-30 part ethene-vinyl acetate copolymer, and 1.5-3 part peroxide cross-linking agent is formed.
Modified crosslinking polyethylene Insulation Material of the present invention, therein ethylene-vinyl acetate copolymer better adopts 20-25 part.
Said peroxide cross-linking agent can adopt common polyethylene linking agent.
The present invention is owing to carry out the flexibility modification to cross-linked polyethylene insulating material, obtain the cross-linked polyethylene insulating material of good bandability, thereby be that 6KV and above high-tension cable increase bendability has been created condition, be aided with improvement again, can obtain the 6KV and the above high-tension cable of good bending property the construction of cable.The present invention's second purpose realizes for this reason, the main improvement is the flexible conductor that the hard conductor of cable is changed into good bending property, and change metallic shield into softish thin copper wire braid shielded, the polyvinyl chloride oversheath changes the polyvinyl chloride elastomerics into, thereby improved the bendability of 6KV and above power cable with cross-linked polyethylene insulation, overcome the deficiencies in the prior art.Specifically, 6KV of the present invention and above power cable with cross-linked polyethylene insulation, comprise conductor, inner shield, crosslinked polyetylene insulated, insulation shielding and polyvinyl chloride oversheath, it is characterized in that said conductor is the stranded flexible conductor of thin copper wire, said insulation is by 100 parts of crosslinked polyethylenes, 15-30 part ethene-vinyl acetate copolymer, 1.5-3 the modified crosslinking polyethylene that part peroxide cross-linking agent is formed, the metallic shield of said insulation shielding is the thin copper wire braid shielded, and said oversheath is a thermoplastic elastomer of polyvinyl-chloride.
Sheath of the present invention adopts thermoplastic elastomer of polyvinyl-chloride, can adopt commercially, for example by polyvinyl chloride and the rubber combined thermoplastic elastomer of forming, can make sheath material also have bendability preferably like this.Thermoplastic elastomer of polyvinyl-chloride can adopt extrusion moulding, simplifies production technique, reduces production costs.
For further improving the flexibility of cable, dwindle bending radius, said thin copper wire stranded conductor, a kind of being more preferably by some thin copper wire bundles becomes strand, by some strand stranded conductors, each interlayer produced slippage when this structure more helped the conductor bending, can significantly improve the sinuousness of conductor again.Wherein twisting pitch better adopts 8-12 times of conductor diameter, to strengthen the spring effect of conductor bending, reaches both soft good bandability, has good structure restoration stability again.
In addition, semiconduction cloth and extrusion type plastics semi-conductive layer unitized construction are better adopted in inner shield, and the existing electric action of semiconduction cloth in the inner shield can play again and tighten soft stranded conductor effect like this, helps the bending of cable.
The present invention is owing to carry out the softness modification to cross-linked polyethylene insulating material, thereby improved crosslinked polyetylene insulated flexible performance greatly, make it have elasticity preferably at normal temperatures, not only improve the condition of having created for crosslinked polyetylene insulated high-tension cable bendability, and improved the Insulation Material resistance to low temperature, find that through test the modification Insulation Material does not ftracture through-50 ℃ of low-temperature impacts.Simultaneously conductor is changed into the stranded flexible conductor of thin copper wire, strands also dwindles twisting pitch; Change the metallic shield of insulation shielding into the thin copper wire braid shielded; Outer jacket adopts the good polyvinyl chloride material elastomerics of flexibility, thereby the bending property of 6KV and above power cable with cross-linked polyethylene insulation is significantly improved, bending radius only is 6-8 a times of cable size, number of bends is greater than 1000-1100 time (pressing the GB/T12706.2-2002 test conditions), the minimum installation environment temperature of cable is-25 ℃, and shielding properties is improved.
Below in conjunction with an embodiment, further specify the present invention.
Description of drawings
Accompanying drawing is 6KV and above crosslinked polyetylene insulated three-phase electrical cable structural representation.
Embodiment
Embodiment: referring to accompanying drawing, 6KV of the present invention and above crosslinked polyetylene insulated three-phase electrical cable, press the high-tension cable structure, single cable core becomes strand by some thin copper wire bundles, and by the synthetic conductor 1 of plurality of twisted strands, outer semiconduction cloth of conductor and extrusion type plastics semi-conductive layer combination inner shield 2, modified crosslinking polyethylene insulation 3, extrusion type plastics semiconduction insulation screen 4, copper wire woven shield 5 is formed, three stranded strandings of cable core, filling PP tear-strap fills 6 in the gap, is tightened by non-woven fabrics lapping layer 7 then, outward by thermoplastic elastomer of polyvinyl-chloride (TPE) oversheath 8.
The modified crosslinking polyethylene insulation, by 100 parts of polyethylene, 20 parts of ethene-vinyl acetate copolymers, 2.5 parts of DCP peroxide cross-linking agents, 1.5 parts of oxidation inhibitor are by common crosslinked worker's condition kneading, granulation.
In addition, the modified crosslinking polyethylene Insulation Material can also adopt material ratio cooperation in the composition range of the present invention, and add some other function component material.Extrusion type plastics semi-conductive layer, base-material can adopt crosslinked polyethylene, also can adopt the crosslinked polyethylene of modification.The cold-resistant resin that the polyvinyl chloride oversheath also can adopt polyvinyl chloride and maleic acid ester copolymerization to form.
Claims (6)
1, modified crosslinking polyethylene Insulation Material is characterized in that by 100 parts of polyethylene, 15-30 part ethene-vinyl acetate copolymer, and 1.5-3 part peroxide cross-linking agent is formed.
2,, it is characterized in that said ethene-vinyl acetate copolymer is 20-25 part according to the described modified crosslinking polyethylene Insulation Material of claim 1.
3,6KV and above power cable with cross-linked polyethylene insulation, comprise conductor, inner shield, crosslinked polyetylene insulated, insulation shielding and polyvinyl chloride oversheath, it is characterized in that said conductor is the stranded flexible conductor of thin copper wire, said insulation is by 100 parts of crosslinked polyethylenes, 15-30 part ethene-vinyl acetate copolymer, 1.5-3 the crosslinked polyethylene of part peroxide cross-linking agent modification, the metallic shield of said insulation shielding is the thin copper wire braid shielded, and said oversheath is a thermoplastic elastomer of polyvinyl-chloride.
4, according to described 6KV of claim 3 and above power cable with cross-linked polyethylene insulation, it is characterized in that the stranded flexible conductor of said thin copper wire, become strand by some thin copper wire bundles, form by some strands are stranded again.
5,, it is characterized in that the conductor twisting pitch is a 8-12 times of conductor diameter according to claim 3 or 4 described 6KV and above power cable with cross-linked polyethylene insulation.
6,, it is characterized in that said inner shield is made up of semiconduction cloth and extrusion type plastics semi-conductive layer according to described 6KV of claim 5 and above power cable with cross-linked polyethylene insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510041399 CN1730531A (en) | 2005-08-07 | 2005-08-07 | Improved crosslinked polyetylene insulated material and power cable for 6KV and above |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510041399 CN1730531A (en) | 2005-08-07 | 2005-08-07 | Improved crosslinked polyetylene insulated material and power cable for 6KV and above |
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| CN1730531A true CN1730531A (en) | 2006-02-08 |
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| CN 200510041399 Pending CN1730531A (en) | 2005-08-07 | 2005-08-07 | Improved crosslinked polyetylene insulated material and power cable for 6KV and above |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104713B (en) * | 2006-07-12 | 2010-09-08 | 上海电缆研究所 | Water tree resistant polyolefin electrical insulation composition |
| CN101851368A (en) * | 2010-05-26 | 2010-10-06 | 江苏巨业电缆有限公司 | Anti-125 DEG C-level low smoke halogen free-flame retardant single-core cable insulation rubber for railway locomotive |
| CN101602870B (en) * | 2009-07-08 | 2011-10-19 | 江苏中兴电缆有限公司 | Soft cross-linked polyethylene insulating material |
| CN102290135A (en) * | 2011-06-15 | 2011-12-21 | 宁波东方电缆股份有限公司 | Three-core photoelectric composite submarine cable with 220kV rated voltage |
| CN101692356B (en) * | 2009-11-17 | 2012-08-29 | 四川鑫电电缆有限公司 | Low temperature-resistant and distortion-resistant power cable with copper conductor TPE insulated sheath for wind power generation |
| CN103554633A (en) * | 2013-10-24 | 2014-02-05 | 苏州市双鑫新材料科技有限公司 | High-voltage cable structure with excellent performance |
| CN103554634A (en) * | 2013-10-24 | 2014-02-05 | 苏州市双鑫新材料科技有限公司 | High-voltage cable structure with insulating layer with excellent performance |
| CN108550413A (en) * | 2018-03-27 | 2018-09-18 | 青岛胶州电缆有限公司 | The soft electric control cable of flame-proof crosslinked polyethylene insulation shielding and its production technology |
-
2005
- 2005-08-07 CN CN 200510041399 patent/CN1730531A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104713B (en) * | 2006-07-12 | 2010-09-08 | 上海电缆研究所 | Water tree resistant polyolefin electrical insulation composition |
| CN101602870B (en) * | 2009-07-08 | 2011-10-19 | 江苏中兴电缆有限公司 | Soft cross-linked polyethylene insulating material |
| CN101692356B (en) * | 2009-11-17 | 2012-08-29 | 四川鑫电电缆有限公司 | Low temperature-resistant and distortion-resistant power cable with copper conductor TPE insulated sheath for wind power generation |
| CN101851368A (en) * | 2010-05-26 | 2010-10-06 | 江苏巨业电缆有限公司 | Anti-125 DEG C-level low smoke halogen free-flame retardant single-core cable insulation rubber for railway locomotive |
| CN101851368B (en) * | 2010-05-26 | 2011-12-21 | 江苏巨业电缆有限公司 | Anti-125 DEG C-level low smoke halogen free-flame retardant single-core cable insulation rubber for railway locomotive |
| CN102290135A (en) * | 2011-06-15 | 2011-12-21 | 宁波东方电缆股份有限公司 | Three-core photoelectric composite submarine cable with 220kV rated voltage |
| CN103554633A (en) * | 2013-10-24 | 2014-02-05 | 苏州市双鑫新材料科技有限公司 | High-voltage cable structure with excellent performance |
| CN103554634A (en) * | 2013-10-24 | 2014-02-05 | 苏州市双鑫新材料科技有限公司 | High-voltage cable structure with insulating layer with excellent performance |
| CN108550413A (en) * | 2018-03-27 | 2018-09-18 | 青岛胶州电缆有限公司 | The soft electric control cable of flame-proof crosslinked polyethylene insulation shielding and its production technology |
| CN108550413B (en) * | 2018-03-27 | 2019-09-06 | 青岛胶州电缆有限公司 | The soft electric control cable of flame-proof crosslinked polyethylene insulation shielding and its production technology |
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Open date: 20060208 |