CN201438634U - Two-layer coextrusion thermal contraction composited tube used for cable termination and cable termination - Google Patents
Two-layer coextrusion thermal contraction composited tube used for cable termination and cable termination Download PDFInfo
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- CN201438634U CN201438634U CN2009201326686U CN200920132668U CN201438634U CN 201438634 U CN201438634 U CN 201438634U CN 2009201326686 U CN2009201326686 U CN 2009201326686U CN 200920132668 U CN200920132668 U CN 200920132668U CN 201438634 U CN201438634 U CN 201438634U
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- thermal contraction
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Abstract
The utility model relates to a two-layer coextrusion thermal contraction composited tube used for a cable termination and the cable termination. The two-layer coextrusion thermal contraction composited tube comprises a stress control layer and an outdoor insulation layer that have the same thermal contraction performance, wherein the outdoor insulation layer is closely coated at the periphery of the stress control layer. Before and after the thermal contraction, the stress control layer and the outdoor insulation layer can be closely combined without any gap. The cable termination comprises the two-layer coextrusion thermal contraction composited tube. The two-layer coextrusion thermal contraction composited tube used for the cable termination can effectively solve the problems of the layering and the air gap existing in different tubes after contraction; moreover, the stress control layer and the outdoor insulation layer can be closely combined without any gap after the contraction, thereby eliminating the interface formed between different materials, greatly improving the electric power-frequency withstand voltage after the cable termination is installed, and lowering the partial discharge.
Description
Technical field
The utility model relates to electric cable fitting, more particularly, relates to two layers of coextruding heat contraction type multiple tube that use on a kind of power cable terminal head and the cable termination that has this two layers of coextruding heat contraction type multiple tube.
Background technology
At present, 35kV and following thermal shrinkage type terminals electric cable accessories mainly are made up of pyrocondensation stress control tube, outdoor insulative pipe, full skirt, branch spider etc.Traditional technology is above-mentioned pyrocondensation pipe fitting to be shunk respectively install on cable.As shown in Figure 1, stress control tube 72 and outdoor insulative pipe 71 are two independent pipe fittings.In traditional technology, the stress control tube of unlike material, outdoor insulative pipe be mixing respectively, extrude, though production technology is comparatively simple, stock utilization is high, irradiation, expansion technology also can be controlled separately, but defectives such as it is lower industrial frequency withstand voltage to occur when carrying out electric experiment after cable termination is installed, and partial discharge is big.This mainly is because the pyrocondensation installation respectively of stress control tube and outdoor insulative pipe exists interface and gap between two layers, thereby has big this deadly defect of partial discharge.
The utility model content
The technical problems to be solved in the utility model is, at prior art stress control tube and the pyrocondensation installation respectively of outdoor insulative pipe when cable termination is installed, there are interface and gap between two layers, the defective that thereby industrial frequency withstand voltage is lower, partial discharge is big provides a kind of two layers of coextruding heat contraction type multiple tube that are used for cable termination.
Another technical problem to be solved in the utility model is, at prior art stress control tube and the pyrocondensation installation respectively of outdoor insulative pipe when cable termination is installed, there are interface and gap between two layers, the defective that thereby industrial frequency withstand voltage is lower, partial discharge is big provides a kind of cable termination that uses two layers of coextruding heat contraction type multiple tube.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of two layers of coextruding heat contraction type multiple tube that are used for cable termination, comprise stress control layer and outdoor insulative layer with identical thermal contraction performance, wherein, described outdoor insulative layer closely is coated on the periphery of described stress control layer.
In thermal contraction formula multiple tube described in the utility model, the thickness of described stress control layer is 1: 2～1: 3 with the thickness ratio of described outdoor insulative layer.
In thermal contraction formula multiple tube described in the utility model, the radial shrinkage ratio of the internal diameter of described thermal contraction multiple tube is greater than 50%.
In thermal contraction formula multiple tube described in the utility model, thermal contraction is forward and backward, and between described stress control layer and the outdoor insulative layer combine closely in seamless no unoccupied place.
A kind of technical scheme that another technical problem that solves the utility model adopts is: construct a kind of cable termination, comprise aforesaid two layers of coextruding heat contraction type multiple tube.
Another technical scheme that another technical problem that solves the utility model adopts is: construct a kind of single-core cable terminal, be included in cable end and peel off cable cover(ing), sheath, copper shield, outer semiconductive layer, core insulating barrier and the core that exposes successively behind each layer from outside to inside successively, be connected the terminal on the described core, it is characterized in that, the part that each layer exposes between described cable cover(ing) and the core insulating barrier all is coated in aforesaid two layers of coextruding heat contraction type multiple tube, and the part between described terminal and the described thermal contraction multiple tube is coated by sealed tube.
In single-core cable terminal described in the utility model, described single-core cable also is provided with steel armour layer between cable cover(ing) and sheath, and described copper shield and steel armour layer are by ground wire grounded.
In single-core cable terminal described in the utility model, described thermal contraction multiple tube periphery is with at least one thermal contraction full skirt.
Another technical scheme that another technical problem that solves the utility model adopts is: construct a kind of multicore cable terminal, be included in cable end and peel off the cable cover(ing) that exposes successively behind each layer from outside to inside successively, sheath, copper shield on each root heart yearn, outer semiconductive layer, core insulating barrier and core, be connected the terminal on the described core, the bifurcation use branch spider of heart yearn coats the part of the screen that cable cover(ing) to each core exposes, it is characterized in that, with respect to each root heart yearn, divide the part that each layer exposes between spider finger tip 191 and the core insulating barrier all to be coated in aforesaid two layers of coextruding heat contraction type multiple tube, the part between described terminal and the described thermal contraction multiple tube is coated by sealed tube.
In multicore cable terminal described in the utility model, described multicore cable also is provided with steel armour layer between cable cover(ing) and sheath, and described copper shield and steel armour layer are by ground wire grounded.
Implement two layers of coextruding heat contraction type multiple tube of the present utility model, have following beneficial effect:
When heat shrink, Stress Control material and outdoor insulative material meeting synchronous can layerings.
Thermal shrinkage type Stress Control/outdoor insulative multiple tube can once finish simultaneously 35kv and following cable termination electric field stress disperses and the two kinds of difference in functionalitys that insulate, and substitutes originally to be inserted in stress control tube respectively and the outdoor insulative pipe shrinks, and installation technology is simple.Solved simultaneously and shunk the interface air gap problem that the back is produced, the partial discharge that the back cable is installed is greatly reduced or eliminated, and improved cable property safe and reliable to operation greatly.
Two layers of coextruding heat contraction type multiple tube that the utility model is used for cable termination can effectively solve the layering of unlike material tubing contraction back existence and the problem of air gap, after the contraction, between described stress control layer and the outdoor insulative layer combine closely in seamless no unoccupied place, eliminated the interface that forms between the different materials, improved the electric industrial frequency withstand voltage after cable termination is installed greatly and reduce partial discharge.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the structural representation of existing thermal contraction single-core cable terminal;
Fig. 2 A is the structural representation that the utility model is used for two layers of coextruding heat contraction type multiple tube of cable termination;
Fig. 2 B is the sectional view of Fig. 2 A;
Fig. 3 is the structure chart according to the single-core cable terminal of the utility model one embodiment;
Fig. 4 is the structure chart according to the multicore cable terminal of the utility model one embodiment.
Embodiment
Fig. 2 A is depicted as the structural representation that the utility model is used for two layers of coextruding heat contraction type multiple tube 7 of cable termination, and Fig. 2 B is the A-A profile of Fig. 2 A.Shown in Fig. 2 A, 2B, two layers of coextruding heat contraction type multiple tube comprise stress control layer 72 and outdoor insulative layer 71, and this outdoor insulative layer 71 closely is coated on the periphery of described stress control layer 72.Stress control layer has identical thermal contraction performance with the outdoor insulative layer, comprising: identical shrinkage temperature, radial shrinkage ratio, vertical rate of change, irradiation dose and expansion technology etc.
The utility model is used for two layers of coextruding heat contraction type multiple tube of cable termination, be with outdoor insulative, two kinds of unlike materials of Stress Control, the masterbatch of difference in functionality plastifies respectively and extrudes, and enters the composite co-extruding die head, a kind of novel coextru-lamination tubing that obtains after the typing cooling.This Stress Control/outdoor insulative composite pipe is expanded behind crosslinking with radiation, has the heat shrink memory effect, is used for power cable terminal and installs.
Two layers of coextruding heat contraction type multiple tube that the utility model is used for cable termination can effectively solve the layering of unlike material tubing contraction back existence and the problem of air gap, after the contraction, between described stress control layer and the outdoor insulative layer combine closely in seamless no unoccupied place, eliminated the interface that forms between the different materials, improved the electric industrial frequency withstand voltage after cable termination is installed greatly and reduce partial discharge.
The thickness of stress control layer is 1: 2～1: 3 with the thickness ratio of described outdoor insulative layer.The forward and backward thickness of thermal contraction is than inequality.
The radial shrinkage ratio of the internal diameter of described thermal contraction multiple tube is greater than 50%.
Fig. 3 is the structure chart according to the single-core cable terminal of the utility model one embodiment, has wherein adopted above-mentioned two layers of coextruding heat contraction type multiple tube.As shown in Figure 3, cable end exposes cable cover(ing) 17, steel armour layer 14, sheath 13, copper shield 11, outer semiconductive layer 9, core insulating barrier 6 and core 5 after peelling off each layer from outside to inside successively successively, terminal 1 is crimped on the described core, the part that each layer exposes between cable cover(ing) and the core insulating barrier all is coated in above-mentioned two layers of coextruding heat contraction type multiple tube 7, and the part between terminal and the thermal contraction multiple tube is coated by sealed tube 2.The core periphery is coated with insulating tape 4, and terminal is coated with fluid sealant 3 to position between the core insulating barrier.
In the present embodiment, thermal contraction multiple tube periphery is with three thermal contraction full skirts 8, and this is required when being used for the open air.Certainly, as is known to the person skilled in the art, the quantity of full skirt is not limited to three, can be one, two, four or more a plurality of.
In addition, as shown in Figure 3, in the strip off part of described cable end:
The connecting portion of outer semiconductive layer exposed portions serve and core insulating barrier exposed portions serve connecting portion and outer semiconductive layer exposed portions serve and copper shield exposed portions serve is coated with stress evacuating glue 10.Wherein, stress evacuating glue has the respective electric characterisitic parameter, is wrapped in the cable shield end usually, plays and relaxes and the dispersion electric field stress, eliminates air gap, reduces effects such as partial discharge.
The connecting portion of the connecting portion of sheath exposed portions serve and copper shield exposed portions serve, sheath exposed portions serve and steel armour layer exposed portions serve is coated with general filling glue 15.Wherein, generally to fill glue and be used for single core or three-core cable terminal bifurcated and steel armour place, play filling, avoid the wedge angle burr, insulation. trapping, effect such as block water.
Terminal is coated with fluid sealant 3 to position between the core insulating barrier.Cable cover(ing) and two layers of coextruding heat contraction type multiple tube joint portion are coated with fluid sealant 3.Wherein, fluid sealant is used for cable cover(ing) or outdoor heat-shrink tube two ends, has effects such as high-low temperature resistant, waterproof, air pressure resistance, sealing.
Copper shield and steel armour layer are by ground wire 12 ground connection.
In preferred embodiment of the present utility model, in close described terminal one side, according to rated voltage for cable grade difference, thermal contraction multiple tube end is also different with distance between the described core insulating barrier end, usually, the rated voltage for cable grade is high more, and the distance between thermal contraction multiple tube end and the described core insulating barrier end is also long more.
Though among the embodiment shown in Figure 3, cable comprises steel armour layer, those skilled in the art should know, and two layers of coextruding heat contraction type multiple tube of the present utility model also can be applicable to non-steel armored cable.
Fig. 4 is the structure chart according to the multicore cable terminal of the utility model one embodiment, has wherein adopted above-mentioned two layers of coextruding heat contraction type multiple tube.As shown in Figure 4, cable end exposes cable cover(ing) 17, steel armour layer 14, sheath 13, copper shield 11, outer semiconductive layer 9, core insulating barrier 6 and core 5 after peelling off each layer from outside to inside successively successively.Different with the single-core cable of Fig. 3 is, after multicore cable sheath 13 strip ofves of Fig. 4, exposes three heart yearns, and ecto-entad has copper shield 11, semiconductive layer 9 and core insulating barrier 6 and core successively on the every heart yearn, and terminal 1 is crimped on the core.As shown in Figure 4, use branch spider 19 that the partly shielding effect layer 11 of cable cover(ing) 17 to each core coated in the bifurcation of three heart yearns.And,, divide the part that each layer exposes between spider finger tip 191 and the core insulating barrier all to be coated in above-mentioned two layers of coextruding heat contraction type multiple tube with respect to each root heart yearn.In addition, the part between terminal and the thermal contraction multiple tube is coated by sealed tube 2.
Similar to the single-core cable terminal, the connecting portion that the terminal of multicore cable terminal is coated with fluid sealant 3, outer semiconductive layer exposed portions serve and copper shield exposed portions serve to position between the core insulating barrier connecting portion is coated with connecting portion, sheath exposed portions serve and the steel armour layer exposed portions serve of stress evacuating glue 10, sheath exposed portions serve and copper shield exposed portions serve is coated with general filling glue 15, cable cover(ing) and two layers of coextruding heat contraction type multiple tube joint portion and is coated with fluid sealant 3.Copper shield and steel armour layer are by ground wire 12 ground connection.
Prove through the electrical test of 8.7/15kV three-core cable terminal: former mounting process be about to stress control tube, outdoor insulative pipe respectively pyrocondensation be installed in cable termination, partial discharge is 15kV, 7～9Pc; Two layers of co-extrusion Stress Control/outdoor insulative multiple tube pyrocondensation are installed in cable termination, and partial discharge is 15kV, 2～4Pc.
The outdoor insulative tube material not only will have the good insulation performance performance, also will have weatherability, and hydrophobicity, combination property requirements such as anti-flammability and mechanical property are decreased in the anti-galvanic corrosion of anti-electric traceization.
Concrete technical indicator is:
Hot strength＞8Mpa
Elongation at break＞350%
Specific insulation＞10
14Ω .cm
Electric breakdown strength＞20kv/mm
Hardness (Shao Shi A)＜90
Radial shrinkage ratio＞50%
Vertical rate of change＜± 5%
1A 3.5 is decreased in the anti-galvanic corrosion of anti-electric traceization
Oxygen index (OI)＞30
The Stress Control tube material will have high dielectric constant and than low resistance and can improve combination property requirements such as electric field stress and mechanical property.
Concrete technical indicator is
Hot strength＞10Mpa
Elongation at break＞350%
Specific insulation 10
8-10
12Ω cm
Dielectric constant＞20
Hardness (Shao Shi A)＜90
Radial shrinkage ratio＞50%
Vertical rate of change＜± 5%
Stress Control material and outdoor insulative material coextrusion mold become double-layer composite pipe, promptly in moulding process, two kinds of materials are combined into one, through extruding, operations such as irradiation and expansion form the better composite material of performance.When heat shrink, Stress Control material and outdoor insulative material meeting synchronous can layerings.Thermal shrinkage type Stress Control/outdoor insulative multiple tube can once finish simultaneously 35kv and following cable termination electric field stress disperses and the two kinds of difference in functionalitys that insulate, and substitutes originally to be inserted in stress control tube respectively and the outdoor insulative pipe shrinks, and installation technology is simple.Solved simultaneously and shunk the interface air gap problem that the back is produced, the partial discharge that the back cable is installed is greatly reduced or eliminated, and improved cable property safe and reliable to operation greatly.It is 35kv and new technology of following thermal shrinkage type terminals electric cable accessories and developing direction that two layers of coextruding heat shrink the multiple tube product.
Claims (10)
1. two layers of coextruding heat contraction type multiple tube that are used for cable termination is characterized in that, comprise stress control layer and outdoor insulative layer with identical thermal contraction performance, wherein, described outdoor insulative layer closely is coated on the periphery of described stress control layer.
2. thermal contraction formula multiple tube according to claim 1 is characterized in that, the thickness of described stress control layer is 1: 2～1: 3 with the thickness ratio of described outdoor insulative layer.
3. thermal contraction formula multiple tube according to claim 2 is characterized in that the radial shrinkage ratio of the internal diameter of described thermal contraction multiple tube is greater than 50%.
4. thermal contraction formula multiple tube according to claim 3 is characterized in that thermal contraction is forward and backward, and between described stress control layer and the outdoor insulative layer combine closely in seamless no unoccupied place.
5. a cable termination is characterized in that, comprises as each described two layers of coextruding heat contraction type multiple tubes in the claim 1 to 4.
6. single-core cable terminal, be included in cable end and peel off cable cover(ing), sheath, copper shield, outer semiconductive layer, core insulating barrier and the core that exposes successively behind each layer from outside to inside successively, be connected the terminal on the described core, it is characterized in that, the part that each layer exposes between described cable cover(ing) and the core insulating barrier all is coated on as in each described two layers of coextruding heat contraction type multiple tubes in the claim 1 to 4, and the part between described terminal and the described thermal contraction multiple tube is coated by sealed tube.
7. single-core cable terminal according to claim 6 is characterized in that, described single-core cable also is provided with steel armour layer between cable cover(ing) and sheath, and described copper shield and steel armour layer are by ground wire grounded.
8. according to claim 6 or 7 described single-core cable terminals, it is characterized in that described thermal contraction multiple tube periphery is with at least one thermal contraction full skirt.
9. multicore cable terminal, be included in cable end and peel off the cable cover(ing) that exposes successively behind each layer from outside to inside successively, sheath, copper shield on each root heart yearn, outer semiconductive layer, core insulating barrier and core, be connected the terminal on the described core, the bifurcation use branch spider of heart yearn coats the part of the screen that cable cover(ing) to each core exposes, it is characterized in that, with respect to each root heart yearn, divide the part that each layer exposes between spider finger tip (191) and the core insulating barrier all to be coated on as in each described two layers of coextruding heat contraction type multiple tubes in the claim 1 to 4, the part between described terminal and the described thermal contraction multiple tube is coated by sealed tube.
10. multicore cable terminal according to claim 9 is characterized in that, described multicore cable also is provided with steel armour layer between cable cover(ing) and sheath, and described copper shield and steel armour layer are by ground wire grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201326686U CN201438634U (en) | 2009-06-11 | 2009-06-11 | Two-layer coextrusion thermal contraction composited tube used for cable termination and cable termination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201326686U CN201438634U (en) | 2009-06-11 | 2009-06-11 | Two-layer coextrusion thermal contraction composited tube used for cable termination and cable termination |
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| CN201438634U true CN201438634U (en) | 2010-04-14 |
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| CN2009201326686U Expired - Lifetime CN201438634U (en) | 2009-06-11 | 2009-06-11 | Two-layer coextrusion thermal contraction composited tube used for cable termination and cable termination |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149394A (en) * | 2013-03-15 | 2013-06-12 | 无锡市曙光电缆有限公司 | Shortening type deionized water terminal for cable partial discharge test |
| CN103869228A (en) * | 2014-04-02 | 2014-06-18 | 上海华普电缆有限公司 | Terminal for partial discharge tests on stress ring-oil seal type crosslinked polyethylene power cable of 35 kV or lower |
| CN103869104A (en) * | 2014-04-02 | 2014-06-18 | 上海华普电缆有限公司 | Stress ring for partial discharge tests and high-voltage insulation tests on power cable of 10 kV or lower |
| CN104466616A (en) * | 2014-12-11 | 2015-03-25 | 张家港金海港电线电缆有限公司 | Process for manufacturing plug-in type cable head |
| CN107994536A (en) * | 2018-01-05 | 2018-05-04 | 长园电子（东莞）有限公司 | A kind of electric railway 27.5kV pyrocondensation tags and preparation method thereof |
-
2009
- 2009-06-11 CN CN2009201326686U patent/CN201438634U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149394A (en) * | 2013-03-15 | 2013-06-12 | 无锡市曙光电缆有限公司 | Shortening type deionized water terminal for cable partial discharge test |
| CN103869228A (en) * | 2014-04-02 | 2014-06-18 | 上海华普电缆有限公司 | Terminal for partial discharge tests on stress ring-oil seal type crosslinked polyethylene power cable of 35 kV or lower |
| CN103869104A (en) * | 2014-04-02 | 2014-06-18 | 上海华普电缆有限公司 | Stress ring for partial discharge tests and high-voltage insulation tests on power cable of 10 kV or lower |
| CN103869228B (en) * | 2014-04-02 | 2016-05-11 | 上海华普电缆有限公司 | 35kV and following NOL ring-oil sealing type cross-inked polyethylene power cable shelf depreciation test terminal |
| CN104466616A (en) * | 2014-12-11 | 2015-03-25 | 张家港金海港电线电缆有限公司 | Process for manufacturing plug-in type cable head |
| CN107994536A (en) * | 2018-01-05 | 2018-05-04 | 长园电子（东莞）有限公司 | A kind of electric railway 27.5kV pyrocondensation tags and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHANGYUAN GROUP CO., LTD. Free format text: FORMER NAME: SHENZHEN CHANGYUAN GROUP LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518057 Guangdong Province, Shenzhen city Nanshan District science and Technology Industrial Park Keyuan Road Changyuan new material research and development center in Hong Kong F Building 5 floor Patentee after: ChangYuan Group Ltd. Address before: 518057 Guangdong Province, Shenzhen city Nanshan District science and Technology Industrial Park Keyuan Road Changyuan new material research and development center in Hong Kong F Building 5 floor Patentee before: Shenzhen ChangYuan Group Ltd. |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20180426 Address after: 518000 Nanshan District, Shenzhen, Guangdong, Guangdong Province, high tech Zone, Guangdong Road, Keyuan Road, Changyuan new material port 5 Building 2 Patentee after: Changyuan electronic (Group) Co., Ltd. Address before: 518057 R & D center, 5 building, F building, Changyuan new material port, Keyuan Middle Road, Nanshan District science and Technology Industrial Park, Shenzhen, Guangdong Patentee before: ChangYuan Group Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100414 |
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| CX01 | Expiry of patent term |