CN102760542A - Three-layer thermal shrinkage composite tube - Google Patents
Three-layer thermal shrinkage composite tube Download PDFInfo
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- CN102760542A CN102760542A CN2012102408590A CN201210240859A CN102760542A CN 102760542 A CN102760542 A CN 102760542A CN 2012102408590 A CN2012102408590 A CN 2012102408590A CN 201210240859 A CN201210240859 A CN 201210240859A CN 102760542 A CN102760542 A CN 102760542A
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- pyrocondensation
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- conductive layer
- thermal shrinkage
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The invention discloses a three-layer thermal shrinkage composite tube which is composed of a thermal shrinkage semi-conductive layer, a thermal shrinkage insulation layer and an elastic shrinkage layer, wherein the thermal shrinkage semi-conductive layer is positioned at the outer side; the elastic shrinkage layer is positioned at the inner side; the thermal shrinkage insulation layer is positioned between the thermal shrinkage semi-conductive layer and the elastic shrinkage layer; the thermal shrinkage temperature of the thermal shrinkage insulation layer is lower than that of the thermal shrinkage semi-conductive layer; and the thermal shrinkage insulation layer and the thermal shrinkage semi-conductive layer can be shrunk simultaneously, and have great shrinkage force so as to force the elastic shrinkage layer to be shrunk. By adopting the three-layer thermal shrinkage composite tube disclosed by the invention, the partial electric discharge of a thermal shrinkage power cable straight coupling with voltage level of 35kV and above can be guaranteed to be less than 5pc.
Description
Technical field
The present invention relates to a kind of pyrocondensation multiple tube, relate in particular to a kind of pyrocondensation multiple tube of three-decker.
Background technology
The pyrocondensation power cable straight coupling of 35kV and above electric pressure, its structure generally comprise insulated tube in pyrocondensation multiple tube and the pyrocondensation, and insulated tube is in the inboard in the pyrocondensation, and the pyrocondensation multiple tube is coated on the outside of insulated tube in the pyrocondensation.The pyrocondensation multiple tube is a double-layer structure; Outer is the pyrocondensation semi-conductive layer; Internal layer is the pyrocondensation insulating barrier because the elasticity of pyrocondensation insulating barrier is very poor, when its be in the inboard pyrocondensation after the insulated tube pyrocondensation together; Exist interfacial gap between the insulated tube in insulating barrier and the pyrocondensation; Cause the pyrocondensation power cable straight coupling partial discharge of 35kV and above electric pressure excessive, reach more than the 100pc, the partial discharge of pyrocondensation power cable straight coupling that can not satisfy 35kV and above electric pressure is less than the requirement of 10pc.
Chinese patent CN 102013291 B have invented a kind of pyrocondensation multiple tube; Mainly be to solve the partial discharge of pyrocondensation power cable straight coupling of 35kV and above electric pressure, but surpass 1 year, because elastic insulating layer generation permanent deformation when the pyrocondensation multiple tube resting period less than the technical problem of 10pc; Can't return to original size; Its outside pyrocondensation semi-conductive layer is limited by pyrocondensation power cable straight coupling structural principle, and thickness can not be too thick, so its thermal shrinkage force is limited; Can not force elastic insulating layer to return to original size; Thereby cause in pyrocondensation multiple tube and the pyrocondensation between the insulated tube contact not tight, even the gap occurs, final result is that the partial discharge of the pyrocondensation power cable straight coupling of 35kV and above electric pressure can not be less than 10pc.
Summary of the invention
The technical problem that the present invention will solve is: it is not tight to overcome in existing pyrocondensation multiple tube and the pyrocondensation between the insulated tube contact; The partial discharge of pyrocondensation power cable straight coupling that causes 35kV and above electric pressure is greater than the defective of 10pc; A kind of three layers of pyrocondensation multiple tube are provided, and its partial discharge of pyrocondensation power cable straight coupling that can guarantee 35kV and above electric pressure is less than 5pc.
In order to solve the problems of the technologies described above; The present invention proposes following technical scheme: a kind of three layers of pyrocondensation multiple tube, and it is made up of pyrocondensation semi-conductive layer, pyrocondensation insulating barrier and elastic shrinkage layer, and this pyrocondensation semi-conductive layer is positioned at the outside; This elastic shrinkage layer is positioned at the inboard; This pyrocondensation insulating barrier is between pyrocondensation semi-conductive layer and elastic shrinkage layer, and the heat shrink temperature of this pyrocondensation insulating barrier is lower than the heat shrink temperature of this pyrocondensation semi-conductive layer, and this pyrocondensation insulating barrier and this pyrocondensation semi-conductive layer can synchronous; This pyrocondensation semi-conductive layer and pyrocondensation insulating barrier convergent force are big, can force this elastic shrinkage layer to shrink.
The further qualification of technique scheme is; The thickness of said pyrocondensation semi-conductive layer is the 0.4-1.2 millimeter; Be made up of for 5-20 parts low density polyethylene (LDPE) 20-50 part, ethylene-vinyl acetate copolymer 50-80 part and superconduction carbon black, specific insulation is 0-1 * 10
3Ω CM, the beginning heat shrink temperature is 120 ℃.
The further qualification of technique scheme is that the thickness of said pyrocondensation insulating barrier is the 5-9 millimeter, is made up of for 30-80 parts 100 parts of ethylene-vinyl acetate copolymers, ethylene propylene diene rubber 10-30 part, magnesium hydroxide, and the beginning heat shrink temperature is 90 ℃.
The further qualification of technique scheme is that the thickness of said elastic shrinkage layer is the 2-4 millimeter, is made up of ethylene propylene diene rubber, and the Mooney viscosity of said ethylene propylene diene rubber (1+4) is 30-50 for 125 ℃.
Compared with prior art; The present invention has following beneficial effect: three layers of pyrocondensation multiple tube of the present invention, and the heat shrink temperature of this pyrocondensation insulating barrier is lower, and the heat shrink temperature of pyrocondensation semi-conductive layer is higher; When the pyrocondensation semi-conductive layer reaches shrinkage temperature; The pyrocondensation insulating barrier also reaches shrinkage temperature, and pyrocondensation insulating barrier and pyrocondensation semi-conductive layer can synchronous, and contraction speed is fast.The pyrocondensation thickness of insulating layer is bigger; Convergent force is big; The elastic shrinkage layer thickness is less, and pyrocondensation semi-conductive layer and pyrocondensation insulating barrier can force the elastic shrinkage layer to shrink, even elastic insulating layer generation permanent deformation; Pyrocondensation semi-conductive layer and pyrocondensation insulating barrier also can force it to return to original size, thereby the partial discharge of the pyrocondensation power cable straight coupling of assurance 35kV and above electric pressure is less than 5pc.
Description of drawings
Fig. 1 is the cross sectional view of three layers of pyrocondensation multiple tube of the present invention.
Embodiment
See also Fig. 1, a kind of three layers of pyrocondensation multiple tube 100, it is made up of pyrocondensation semi-conductive layer 1, pyrocondensation insulating barrier 2 and elastic shrinkage layer 3.
This pyrocondensation semi-conductive layer 1 is positioned at the outside, and this elastic shrinkage layer 3 is positioned at the inboard, and this pyrocondensation insulating barrier 2 is between pyrocondensation semi-conductive layer 1 and elastic shrinkage layer 3.
The thickness of said pyrocondensation semi-conductive layer 1 is the 0.5-1.2 millimeter, is made up of for 5-20 parts low density polyethylene (LDPE) 20-50 part, ethylene-vinyl acetate copolymer 50-80 part and superconduction carbon black, and specific insulation is 0-1 * 10
3Ω CM, the beginning heat shrink temperature is 120 ℃.
The thickness of said pyrocondensation insulating barrier 2 is the 5-9 millimeter, is made up of for 30-80 parts 100 parts of ethylene-vinyl acetate copolymers, ethylene propylene diene rubber 10-30 part, magnesium hydroxide, and the beginning heat shrink temperature is 90 ℃.
The thickness of said elastic shrinkage layer 3 is the 2-4 millimeter, is made up of ethylene propylene diene rubber, can rely on himself elastic shrinkage.The Mooney viscosity of said ethylene propylene diene rubber (1+4) is 30-50 for 125 ℃.
The heat shrink temperature of this pyrocondensation insulating barrier 2 is lower than the heat shrink temperature of this pyrocondensation semi-conductive layer 1; This pyrocondensation insulating barrier 2 and this pyrocondensation semi-conductive layer 1 can synchronous; Contraction speed is fast, and this pyrocondensation semi-conductive layer 1 is big with pyrocondensation insulating barrier 2 convergent forces in addition, can force this elastic shrinkage layer 3 to shrink.
Embodiment 1
Three layers of pyrocondensation multiple tube, the thickness of pyrocondensation semi-conductive layer are 0.4 millimeter, are made up of for 5 parts 20 parts of low density polyethylene (LDPE)s, 80 parts of ethylene-vinyl acetate copolymers and superconduction carbon black.
The thickness of pyrocondensation insulating barrier is 5 millimeters, is made up of for 30 parts 100 parts of ethylene-vinyl acetate copolymers, 10 parts of ethylene propylene diene rubbers, magnesium hydroxide.
The thickness of elastic shrinkage layer is 4 millimeters, is made up of ethylene propylene diene rubber.
Three layers of pyrocondensation multiple tube, the thickness of pyrocondensation semi-conductive layer are 1.2 millimeters, are made up of for 20 parts 50 parts of low density polyethylene (LDPE)s, 50 parts of ethylene-vinyl acetate copolymers and superconduction carbon black.
The thickness of pyrocondensation insulating barrier is 9 millimeters, is made up of for 80 parts 100 parts of ethylene-vinyl acetate copolymers, 30 parts of ethylene propylene diene rubbers, magnesium hydroxide.
The thickness of elastic shrinkage layer is 2 millimeters, is made up of ethylene propylene diene rubber.
Three layers of pyrocondensation multiple tube, the thickness of pyrocondensation semi-conductive layer are 0.8 millimeter, are made up of for 12 parts 35 parts of low density polyethylene (LDPE)s, 65 parts of ethylene-vinyl acetate copolymers and superconduction carbon black.
The thickness of pyrocondensation insulating barrier is 7 millimeters, is made up of for 55 parts 100 parts of ethylene-vinyl acetate copolymers, 20 parts of ethylene propylene diene rubbers, magnesium hydroxide.
The thickness of elastic shrinkage layer is 2 millimeters, is made up of ethylene propylene diene rubber.
The performance of embodiment is following:
Can find out that from embodiment and Comparative Examples the ST of embodiment is short, the ST of Comparative Examples is long; After shrinking, embodiment can return to original size; And Comparative Examples can not return to original size after shrinking, and the office of embodiment puts less, all less than 5 pc; And the office of Comparative Examples is unconventional and unrestrained to 56 pc, is substandard product.
Claims (4)
1. three layers of pyrocondensation multiple tube; It is characterized in that it is made up of pyrocondensation semi-conductive layer, pyrocondensation insulating barrier and elastic shrinkage layer, this pyrocondensation semi-conductive layer is positioned at the outside; This elastic shrinkage layer is positioned at the inboard; This pyrocondensation insulating barrier is between pyrocondensation semi-conductive layer and elastic shrinkage layer, and the heat shrink temperature of this pyrocondensation insulating barrier is lower than the heat shrink temperature of this pyrocondensation semi-conductive layer, and this pyrocondensation insulating barrier and this pyrocondensation semi-conductive layer can synchronous; This pyrocondensation semi-conductive layer and pyrocondensation insulating barrier convergent force are big, can force this elastic shrinkage layer to shrink.
2. three layers of pyrocondensation multiple tube according to claim 1; It is characterized in that; The thickness of said pyrocondensation semi-conductive layer is the 0.4-1.2 millimeter; Be made up of for 5-20 parts low density polyethylene (LDPE) 20-50 part, ethylene-vinyl acetate copolymer 50-80 part and superconduction carbon black, specific insulation is 0-1 * 10
3Ω CM, the beginning heat shrink temperature is 120 ℃.
3. three layers of pyrocondensation multiple tube according to claim 1; It is characterized in that; The thickness of said pyrocondensation insulating barrier is the 5-9 millimeter, is made up of for 30-80 parts 100 parts of ethylene-vinyl acetate copolymers, ethylene propylene diene rubber 10-30 part, magnesium hydroxide, and the beginning heat shrink temperature is 90 ℃.
4. three layers of pyrocondensation multiple tube according to claim 1 is characterized in that the thickness of said elastic shrinkage layer is the 2-4 millimeter, are made up of ethylene propylene diene rubber, and the Mooney viscosity of said ethylene propylene diene rubber (1+4) is 30-50 for 125 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102408590A CN102760542A (en) | 2012-07-12 | 2012-07-12 | Three-layer thermal shrinkage composite tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102408590A CN102760542A (en) | 2012-07-12 | 2012-07-12 | Three-layer thermal shrinkage composite tube |
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| Publication Number | Publication Date |
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| CN102760542A true CN102760542A (en) | 2012-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012102408590A Pending CN102760542A (en) | 2012-07-12 | 2012-07-12 | Three-layer thermal shrinkage composite tube |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110931187A (en) * | 2019-12-16 | 2020-03-27 | 江苏沃能电气科技有限公司 | Preparation method of composite insulating pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5942918A (en) * | 1982-09-03 | 1984-03-09 | Fujikura Ltd | Preparation of heat shrinkable tube |
| CN101330200A (en) * | 2007-09-21 | 2008-12-24 | 深圳市长园新材料股份有限公司 | Thermal shrinkage type composite casing tube for cable midst joint and manufacturing method thereof |
| US7540776B2 (en) * | 2003-11-20 | 2009-06-02 | Tyco Electronics Raychem Gmbh | Heat-shrink tube |
| CN201303245Y (en) * | 2008-08-28 | 2009-09-02 | 国网武汉高压研究院 | Three-layered composite cable transition joint |
| CN102013291A (en) * | 2010-09-16 | 2011-04-13 | 长园集团股份有限公司 | Heat-shrinkable clad pipe |
-
2012
- 2012-07-12 CN CN2012102408590A patent/CN102760542A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5942918A (en) * | 1982-09-03 | 1984-03-09 | Fujikura Ltd | Preparation of heat shrinkable tube |
| US7540776B2 (en) * | 2003-11-20 | 2009-06-02 | Tyco Electronics Raychem Gmbh | Heat-shrink tube |
| CN101330200A (en) * | 2007-09-21 | 2008-12-24 | 深圳市长园新材料股份有限公司 | Thermal shrinkage type composite casing tube for cable midst joint and manufacturing method thereof |
| CN201303245Y (en) * | 2008-08-28 | 2009-09-02 | 国网武汉高压研究院 | Three-layered composite cable transition joint |
| CN102013291A (en) * | 2010-09-16 | 2011-04-13 | 长园集团股份有限公司 | Heat-shrinkable clad pipe |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110931187A (en) * | 2019-12-16 | 2020-03-27 | 江苏沃能电气科技有限公司 | Preparation method of composite insulating pipe |
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Application publication date: 20121031 |