WO2005053129A1 - Heat-shrink jointing - Google Patents
Heat-shrink jointing Download PDFInfo
- Publication number
- WO2005053129A1 WO2005053129A1 PCT/GB2004/004811 GB2004004811W WO2005053129A1 WO 2005053129 A1 WO2005053129 A1 WO 2005053129A1 GB 2004004811 W GB2004004811 W GB 2004004811W WO 2005053129 A1 WO2005053129 A1 WO 2005053129A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- jointing
- sleeve
- heat
- mid
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
- H02G15/1806—Heat shrinkable sleeves
Definitions
- the present invention relates to a heat-shrink jointing for an electrical power cable, in particular a medium voltage power cable operating at voltages typically between 12 kV and 42 kV inclusive.
- Heat-shrink jointings for electrical power cables use heat-shrinkable polymeric technology to provide one or more heat recoverable sleeves having appropriate electrical characteristics which are shrunk into position around the ends of cables that have been electrically connected together.
- MV medium voltage
- a first type of jointing as shown in Figs, la and lb hereto, comprises a two-piece system that uses only heat-shrink materials to provide two heat recoverable sleeves that respectively provide insulation and the external conductive layer required in the joint.
- An insulating-only sleeve 1 is installed first around the cable joint.
- a second, dual-layer sleeve 2 with a conductive outer layer 3 and an insulating inner layer 4 is then installed over the top of first sleeve 1 to provide a thicker insulating layer 4 and the required conductive outer layer 3.
- the second type of jointing as shown in Fig. 2, comprises a single-piece, elastomeric insulating jointing 5 in which a conducting heat-shrink outer layer 6 is used as a hold-out mechanism for an elastomeric, insulating inner layer 7.
- the insulating inner layer 7 exerts an elastic force to shrink the jointing 5 but is prevented from doing so by the conductive, thermoplastic outer layer 6 that remains rigid until it is heated.
- This second type of jointing obviates the problems created by the use of multiple sleeves by replacing the inner thermoplastic insulating sleeve by an elastic layer 7 that can recover without needing heat.
- This elastic layer 7 is retained in an expanded form by the outer rigid conductive layer 6 that prevents recovery of the jointing 5 until the outer layer 6 is heated during installation.
- the elastomeric inner layer 7 is slower to recover than the heat-shrink materials used in the first system.
- the elastic layer 7 is not rigid, the only mechanism which prevents its recovery prior to installation is the rigid, conductive outer layer 6. This means that the outer layer 6 is usually thicker than would otherwise be required for electrical reasons, thus adding materials and therefore cost to the product.
- the object of the present invention is to provide a heat-shrink jointing for an electrical power cable that overcomes or substantially mitigates the aforementioned problems of conventional jointing systems.
- a heat-shrinkable jointing for an electrical power cable comprising a sleeve or other hollow article having an electrically insulating inner layer, an electrically conductive outer layer, and between the inner and outer layers a thermoplastic mid-layer which can be softened by application of heat to the said sleeve or article to cause and/or permit dimensional recovery thereof.
- the insulating inner layer is comprised of an elastomeric material, which may contribute to the recovery of the sleeve or article.
- thermoplastic mid-layer is preferably electrically insulating and/or preferably substantially rigid, by which is meant at least sufficiently rigid to retain the inner layer in a radially expanded state prior to recovery.
- softening of the mid-layer by the application of heat may permit the elastomeric recovery force of the expanded inner layer to shrink the sleeve or article.
- the mid-layer itself be heat-shrinkable to cause or contribute to the dimensional recovery of the sleeve or article.
- the mid-layer accordingly may be made from heat- shrinkable thermoplastic materials known per se, for example semi-crystalline polyolefms or olefin co-polymers, which are well known and require no further explanation for those familiar with heat-shrink polymer technology.
- the usual cross-linking agents and other additives, for example colourings,, fillers, antioxidants, may optionally be included in the usual quantities as known per se in all three layers.
- the conductive outer layer of the sleeve or article is preferably formed of polymeric material, for example the thermoplastics mentioned above, containing appropriate amounts of electrically conductive carbon blacks and/or other suitable electrically conductive fillers, as known per se.
- compositions for the three layers of articles according to the present invention include the following, using known materials of the kinds indicated in proportions by weight selected within the specified ranges to total 100%: Conductive Outer Layer 60-70%wt EVA (Ethylene/Vinyl Acetate copolymer) 10-20%wt HDPE (High Density Polyethylene) 15-25%wt Conductive carbon black 1 -2%wt Aromatic amine antioxidant
- the three-layered sleeve or article of the jointing according to this invention is preferably of tubular, one-piece construction.
- the term "tubular" is used to indicate an elongate hollow article, which may be a substantially straight sleeve of substantially uniform round or oval cross-section, but is not necessarily limited to any particular longitudinal outline or uniformity of transverse dimensions.
- the sleeve or article especially sleeves of regular cross-sectional shape, may be manufactured efficiently by extrusion.
- layered mouldings are not excluded and will often be preferable for articles of more complex shape.
- the thickness of the conductive outer layer can be made thinner as compared to the previously known product. This is because the conductive outer layer now only has to perform an electrical function and is no longer required also to provide the holdout mechanism, which is separately provided by the mid-layer. In addition, because the mid- layer need not carry the high loading of electrically conductive filler required in the outer layer, adequate hold-out performance can be achieved with a relatively thin mid-layer. Furthermore, an insulating mid-layer may be used to contribute to the total insulation thickness, thus allowing reduction of the inner insulation layer thickness.
- reduction in thickness reduces the elastomeric recovery force which the hold-out mid-layer must bear during storage, enabling further reduction in the holdout thickness.
- Some or all of these reductions may accordingly be used to provide a sleeve or article whose total wall thickness is significantly less than that of the previously known jointings, thus usefully reducing bulk and weight, and importantly allowing heat to penetrate more quickly and bring about faster recovery, which is a considerable advantage in commercial use of the jointing according to the present invention.
- Figs, la and lb are respectively transverse sectional views of the pieces of a first, conventional two-piece heat-shrink jointing as described above;
- Fig. 2 is a transverse sectional view of a second conventional, one-piece heat-shrink jointing as also described above;
- Fig. 3 is a transverse sectional view of a heat-shrink jointing in accordance with the present invention.
- a heat-shrink jointing as shown in Fig. 3 comprises a sleeve 10 in the form of a one- piece, tubular extrusion which is made up of three co-axial radial layers, 11, 12 and 13.
- the innermost layer 11 comprises an electrically insulating layer comprised of an elastomeric material.
- the outermost layer 13 is thin and made of conducting material.
- Between the inner and outer layers 11 and 13 is a rigid, thermoplastic mid-layer 12.
- the mid-layer 12 is recovered by the application of heat thereto and therefore prior to installation of the jointing 10 acts as a hold-out to retain the elastomeric inner layer 11 in a radially expanded state.
- the mid-layer 12 is preferably comprised of an electrically insulating material which provides the advantage that the elastomeric, insulating inner layer 11 can be made thinner than would otherwise be the case.
- the thickness of the conductive outer layer can be made thinner, for example 0.5mm as compared to 4mm in the prior art described above.
- the mid-layer may provide adequate hold-out performance at a tliickness of only 5mm, allowing a reduction in the elastomeric inner layer thickness, for example from the previously known 11mm to only 6mm, thus maintaining a total 11mm insulation thickness.
- the resulting wall thickness of all three layers combined may thus be only 11.5mm, which is significantly less than the total 15mm thickness of the previously known sleeves having the dual-function conductive-and-hold-out layer.
- thermoplastic mid-layer 12 has a faster installation speed than the elastomeric insulation material
- replacement of some of the elastomeric material by an insulating thermoplastic material in the mid-layer 12 of the present invention improves the recovery speed of the jointing as compared with the prior art.
- the jointing of the invention comprises a hybrid jointing that combines both thermoplastic and elastomeric layers to alleviate the weaknesses of purely elastomeric jointing sleeves and of those elastomeric jointings which only comprise two layers.
- a single-sleeve jointing 10 in accordance with the present invention should be sufficient for electrical power cables operating at voltages between 12 kV and 42 kV inclusive as compared to the multiple sleeve arrangements required with heat-shrink-only jointings 1, 2 as described with reference to the Figures la and lb.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602004007690T DE602004007690T2 (en) | 2003-11-20 | 2004-11-12 | HEAT SHRINK CONNECTION |
US10/595,933 US7540776B2 (en) | 2003-11-20 | 2004-11-12 | Heat-shrink tube |
AU2004310532A AU2004310532B2 (en) | 2003-11-20 | 2004-11-12 | Heat-shrink jointing |
EP04798531A EP1702391B1 (en) | 2003-11-20 | 2004-11-12 | Heat-shrink jointing |
DK04798531T DK1702391T3 (en) | 2003-11-20 | 2004-11-12 | Heat shrinkable connection |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0327000.6A GB0327000D0 (en) | 2003-11-20 | 2003-11-20 | Heat shrink jointing |
GB0327000.6 | 2003-11-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005053129A1 true WO2005053129A1 (en) | 2005-06-09 |
Family
ID=29764129
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2004/004811 WO2005053129A1 (en) | 2003-11-20 | 2004-11-12 | Heat-shrink jointing |
Country Status (10)
Country | Link |
---|---|
US (1) | US7540776B2 (en) |
EP (1) | EP1702391B1 (en) |
AT (1) | ATE367673T1 (en) |
AU (1) | AU2004310532B2 (en) |
DE (1) | DE602004007690T2 (en) |
DK (1) | DK1702391T3 (en) |
ES (1) | ES2290773T3 (en) |
GB (1) | GB0327000D0 (en) |
SA (1) | SA04250369B1 (en) |
WO (1) | WO2005053129A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102723151A (en) * | 2011-03-30 | 2012-10-10 | 深圳市宏商材料科技股份有限公司 | Three-layer composite thermal contraction pipe |
Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101053134B (en) * | 2004-10-27 | 2010-10-06 | 普雷斯曼电缆及系统能源有限公司 | Method and device for coating the junction area between at least two elongated elements in particular between electric cables |
EP2636519B1 (en) * | 2012-03-06 | 2014-10-08 | Tyco Electronics Raychem GmbH | Multi-layer heat-shrinkable tubular sleeve |
CN102760542A (en) * | 2012-07-12 | 2012-10-31 | 长园集团股份有限公司 | Three-layer thermal shrinkage composite tube |
US9168101B2 (en) | 2012-09-28 | 2015-10-27 | Morris Azad | Apparatus and method for sterilization and organization of a tamper resistant lock and receptacle |
ES2624682T3 (en) | 2012-12-21 | 2017-07-17 | Tyco Electronics Raychem Gmbh | Multilayer heat shrink tubular sleeve with tension control elements |
WO2014157554A1 (en) * | 2013-03-27 | 2014-10-02 | 株式会社Uacj | Resin-coated wire harness pipe |
EP2999092A1 (en) * | 2014-09-18 | 2016-03-23 | ABB Technology AG | Insulation of a wound conductor and method for insulating such a conductor |
US11239639B2 (en) | 2016-09-30 | 2022-02-01 | TE Connectivity Services Gmbh | Assembly and method for sealing a bundle of wires |
US10109947B2 (en) * | 2017-02-07 | 2018-10-23 | Te Connectivity Corporation | System and method for sealing electrical terminals |
US10483661B2 (en) | 2017-02-07 | 2019-11-19 | Te Connectivity Corporation | System and method for sealing electrical terminals |
US10103458B2 (en) * | 2017-02-07 | 2018-10-16 | Te Connectivity Corporation | System and method for sealing electrical terminals |
US10333234B2 (en) | 2017-08-14 | 2019-06-25 | Shore Acres Enterprises Inc. | Corrosion-protective jacket for electrode |
CA3019309A1 (en) | 2017-10-04 | 2019-04-04 | Shore Acres Enterprises Inc. (D/B/A Sae Inc.) | Electrically-conductive corrosion-protective covering |
US10297946B1 (en) | 2018-04-19 | 2019-05-21 | Te Connectivity Corporation | Apparatus and methods for sealing electrical connections |
US11257612B2 (en) | 2018-07-26 | 2022-02-22 | TE Connectivity Services Gmbh | Assembly and method for sealing a bundle of wires |
EP3624288A1 (en) * | 2018-09-12 | 2020-03-18 | Tyco Electronics Raychem GmbH | Method of installing a heat shrink cover, installation kit, and installation system |
US10998651B2 (en) | 2019-05-22 | 2021-05-04 | Nvent Services Gmbh | Flame-resistant heat shrink assemblies for trace heating cables |
US11508498B2 (en) | 2019-11-26 | 2022-11-22 | Trimtabs Ltd | Cables and methods thereof |
US11421392B2 (en) | 2019-12-18 | 2022-08-23 | Shore Acres Enterprises Inc. | Metallic structure with water impermeable and electrically conductive cementitous surround |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4035534A (en) * | 1972-09-01 | 1977-07-12 | Raychem Corporation | Heat-shrinkable laminate |
EP0328326A1 (en) * | 1988-02-06 | 1989-08-16 | Bowthorpe-Hellermann Limited | Cable screening |
JPH09238423A (en) * | 1996-03-01 | 1997-09-09 | Fujikura Ltd | Semiconductive shrinking tube |
US5914160A (en) * | 1994-11-04 | 1999-06-22 | Sumitomo Electric Industries, Ltd. | Adhesive tube composite tube and method for sealing using the same |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2036460B (en) * | 1978-09-14 | 1983-06-29 | Raychem Ltd | Enclosure for cable termination or joint |
GB2042818B (en) * | 1979-11-30 | 1983-07-27 | Raychem Gmbh | Enclosures for electrical apparatus |
US5365020A (en) * | 1989-04-20 | 1994-11-15 | Pirelli Cavi S.P.A. | Cable joint coverings, devices for applying such coverings and joints obtained therewith |
US6896842B1 (en) * | 1993-10-01 | 2005-05-24 | Boston Scientific Corporation | Medical device balloons containing thermoplastic elastomers |
ATE228431T1 (en) * | 1995-10-06 | 2002-12-15 | Ccs Technology Inc | METHOD FOR PRODUCING A THERMOPLASTIC SHRINK SLEEVE FOR CABLE SLEEVES |
US6022344A (en) * | 1997-12-04 | 2000-02-08 | Npbi International B.V. | Cryopreservation bag |
US7063181B1 (en) * | 2000-04-27 | 2006-06-20 | Dana Corporation | Fluid-borne noise suppression in an automotive power steering system |
-
2003
- 2003-11-20 GB GBGB0327000.6A patent/GB0327000D0/en not_active Ceased
-
2004
- 2004-11-12 AT AT04798531T patent/ATE367673T1/en active
- 2004-11-12 EP EP04798531A patent/EP1702391B1/en active Active
- 2004-11-12 ES ES04798531T patent/ES2290773T3/en active Active
- 2004-11-12 WO PCT/GB2004/004811 patent/WO2005053129A1/en active IP Right Grant
- 2004-11-12 DE DE602004007690T patent/DE602004007690T2/en active Active
- 2004-11-12 DK DK04798531T patent/DK1702391T3/en active
- 2004-11-12 AU AU2004310532A patent/AU2004310532B2/en active Active
- 2004-11-12 US US10/595,933 patent/US7540776B2/en active Active
- 2004-11-20 SA SA4250369A patent/SA04250369B1/en unknown
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4035534A (en) * | 1972-09-01 | 1977-07-12 | Raychem Corporation | Heat-shrinkable laminate |
EP0328326A1 (en) * | 1988-02-06 | 1989-08-16 | Bowthorpe-Hellermann Limited | Cable screening |
US5914160A (en) * | 1994-11-04 | 1999-06-22 | Sumitomo Electric Industries, Ltd. | Adhesive tube composite tube and method for sealing using the same |
JPH09238423A (en) * | 1996-03-01 | 1997-09-09 | Fujikura Ltd | Semiconductive shrinking tube |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 01 30 January 1998 (1998-01-30) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102723151A (en) * | 2011-03-30 | 2012-10-10 | 深圳市宏商材料科技股份有限公司 | Three-layer composite thermal contraction pipe |
Also Published As
Publication number | Publication date |
---|---|
DE602004007690T2 (en) | 2008-04-10 |
GB0327000D0 (en) | 2003-12-24 |
ES2290773T3 (en) | 2008-02-16 |
DE602004007690D1 (en) | 2007-08-30 |
AU2004310532B2 (en) | 2008-06-05 |
AU2004310532A1 (en) | 2005-06-09 |
EP1702391A1 (en) | 2006-09-20 |
DK1702391T3 (en) | 2007-10-29 |
US7540776B2 (en) | 2009-06-02 |
EP1702391B1 (en) | 2007-07-18 |
US20070128925A1 (en) | 2007-06-07 |
ATE367673T1 (en) | 2007-08-15 |
SA04250369B1 (en) | 2008-03-24 |
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