GB2088584A - Overhead electric cable - Google Patents
Overhead electric cable Download PDFInfo
- Publication number
- GB2088584A GB2088584A GB8134785A GB8134785A GB2088584A GB 2088584 A GB2088584 A GB 2088584A GB 8134785 A GB8134785 A GB 8134785A GB 8134785 A GB8134785 A GB 8134785A GB 2088584 A GB2088584 A GB 2088584A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electric cable
- layer
- overhead electric
- layers
- self
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000004020 conductor Substances 0.000 claims abstract description 36
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims description 10
- 230000003287 optical effect Effects 0.000 claims description 9
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- 239000013536 elastomeric material Substances 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 claims description 3
- 229920002379 silicone rubber Polymers 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- -1 polyethylene Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 29
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000001464 adherent effect Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4415—Cables for special applications
- G02B6/4416—Heterogeneous cables
- G02B6/4422—Heterogeneous cables of the overhead type
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/08—Several wires or the like stranded in the form of a rope
- H01B5/10—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material
- H01B5/108—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material stranded around communication or control conductors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
Abstract
An overhead electric cable for use as a power conductor or as an earth conductor and including at least one optical fibre 11, the fibre or fibres being disposed within a fluid-tight non-metallic tube 17 which is surrounded by at least one layer (e.g. layers 18 and 20) of elongate reinforcing elements 21 and conductors 19. The or a such layer (e.g. layer 18) has its elongate elements (conductors 19) arranged so as to co-operate together to impart a self-supporting characteristic to that layer (e.g. by having sector cross-sections and being helically applied), and said layer or layers are applied to form an anti-torsional system. <IMAGE>
Description
SPECIFICATION
Overhead electric cable
The present invention relates to an overhead electric cable having a conductor which contains one or more optical fibres. The cable may be used as a power conductor or as an earth conductor.
Overhead electric cables are known which include a conductor containing one or more optical fibres.
British Patent Specification No. 2 029 043A describes a cable having optical fibres loosely disposed within an aluminium conductor tube, surrounded by mechanically reinforcing elements and conductors with the conductors and reinforcing elements being different metals or metal alloys.
Considerable improvements are provided by the cables disclosed in our copending Applications Nos.
81.28929 and 81.28930. Those Applications disclose overhead cables (for use as power or earth conductors) having a fluid-tight conductor tube with surrounding layers of mechanically reinforcing elements and conductor elements which are electrochemically compatible and arranged in an antitorsional manner. In the cable disclosed in Application 81.28929, the conductortube contains loosely one or more optical fibres, while in Application 81.28930 it contains at least one optical fibre cable, namely one or more telecommunications cables comprising one or more optical fibres and surrounded by at least one protective element.
With the hitherto devised overhead cables, particular care must be taken in their manufacture and subsequent handling to ensure that the conductor tube does not collapse, under the stress of externally applied forces, and penetrate the interstices between the fibres. If such collapse occurs, the metal of the conductor tube could deform or break the fibres or the telecommunication cables contained in the conductor tube. It is moreover important to take precautions, during the manufacture, to protect the fibres or the telecommunication cables from the high temperatures prevailing in extruding the conductor tube, or otherwise in sealing it if it is formed by a longitudinally applied tape the edges of which are then sealed together.Also, particular care must be taken in selecting the metal for the conductor tube so that it is electro-chemically compatible with the metals of the reinforcing elements and conductive elements of the surrounding layer or layers, as described in our Application No.81.28929.
In accordance with the present invention, there is provided an overhead electric cable, comprising one or more optical fibres enclosed within a fluid-tight non-metallic tube which is surrounded by one layer or a plurality of layers of elongate mechanically reinforcing and conductor elements, said elongate elements of said layer or of at least one said layers being arranged so as to co-operate together to impart a self-supporting characteristic to that layer, said plurality of layers being applied to form an anti-torsional system.
This cable has such a construction that the risk of radially inwards collapse of said layers is eliminated.
Assembly of the cable avoids the use of high temperatures in the formation of said layers, which temperatures were required in the prior art for extrusion or sealing of conductor tubes. Moreover, the need is eliminated for a close electro-chemical compatibility of components, as was required with the conductor tube of the prior art arrangements.
Preferably, the elongate elements of the selfsupporting layer have sectoral or "keystone" crosssections and are applied helically. Preferably, the elongate elements of the self-supporting layer are conductors and this layer is the innermost of a plurality of layers of said elongate elements.
One preferred material for the fluid-tight non metallic tube is thermoplastics.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawing, the single figure of which is a cross-section through an overhead electric cable in accordance with this invention.
Referring to the drawing, there is shown a cable 10, intended to be suspended overhead and used as a power conductor of an earth conductor, and containing one or more optical fibres. The cable shown has only one optical fibre 11 and this is provided with a first sheath 12 of silicone rubber adherent to the fibre and a second sheath 13 of nylon adherent to the sheath 12. The fibre 11 and its sheaths 12 and 13 forms a telecommunication element 14, and this is loosely disposed in a protective tube 15. The telecommunication element 14 and the protective tube 15 form a telecommunication cable 16. Each telecommunication element 14 could comprise more than one optical fibre and the telecommunication cable 16 could comprise more than one element 14.Also, the tube 15may comprise a plurality of layers and in any event may be loose or close-fitting about the underlying telecommunication element or elements, and may comprise any appropriate material, for example it may comprise a plastics extrusion or wound up tapes and/or paper.
Moreover, a single sheath (12 or 13) or a plurality of such sheaths may be provided about each fibre or about each group of fibres, may be loose or close-fitting and may comprise any appropriate material.
The telecommunication cable 16 is enclosed by a fluid-tight non-metallic tube 17. Preferably, this tube 17 is made of a thermoplastics material, for example a compact or a cellular polyolefine or a combination of such materials. It could instead comprise a plastics or elastomeric material cross-linked process in order to improve its thermal or mechanical characteristics. We have noted that a particularly suitable material is a polyethylene cross-linked by means of peroxides or irradiation, and this is able to withstand such thermal stresses as are likely to occur for example in the event of over-heating caused by a lightening strike. The use of appropriately cured silicone elastomers has proved equally satisfactory.
The tube 17 may be formed as a single layer as shown, or instead it could comprise several layers each close-fitting or adherent to the underlying layer and optionally made of materials which differ as regards their chemical compositions or their physic al characteristics. Preferably, tube 17 is formed by extrusion.
A layer 18 of elongate electrical conductors 19 is provided around the non-metallic tube 17. These conductors 19 are arranged so as to co-operate together to impart a self-supporting characteristic to the layer 18, eliminating, the risk of the layer 18 (or its constituent conductors) collapsing radially inwards. In the preferred embodiment shown, each conductor 19 has a sectoral or "keystone" crosssection and the conductors are applied helically around the tube 17.
The layer 18 of conductors 19 is surrounded bya layer 20 of elongate mechanically reinforcing elements 21, which are each cylindrical in the embodiment shown. The elements 21 of this outer layer 20 are applied helically in the opposite sense to the helically applied conductors 19, so that the layers 18 and 20 form an anti-torsional system. The elements 21 may be arranged to impart a self-supporting characteristic to the layer 20, as well as or instead of the layer 18 having this characteristic. There may be a plurality of helically applied layers of said conductors and reinforcing elements, or there may simply be a single helically applied layer composed of reinforcing and conductor elements and having the self-supporting characteristic.
In the embodiment shown, the tube 17 loosely encloses one telecommunication cable 16, but it may loosely enclose a plurality of such cables. Alternatively, the tube 17 may have an inner diameter equal to the outer diameter of the cable 16 (or of the cylinder circumscribing the plurality of such cables), or indeed the cable or cables 16 may be an interference fit within the tube 17 (and embraced thereby).
Instead of housing one or more telecommunication cables 16, the tube 17 could house at least one optical fibre (bare or with a primary covering) or at least one telecommunication element 14, either
loosely or in close-fitting manner.
With the fluid-tight non-metallic tube 17, it is not
necessary to provide any other protection for the optical fibres, within the tube 17.
Claims (11)
1. An overhead electric cable, comprising one or
more optical fibres enclosed within a fluid-tight
non-metallic tube which is surrounded by one layer
or a plurality of layers of elongate mechanically
reinforcing and conductor elements, said elongate
elements of said layer or of at least one said layers
being arranged so as to co-operate together to
impart a self-supporting characteristic to that layer,
said plurality of layers being applied to form an
anti-torsional system.
2. An overhead electric cable as claimed in claim
1, in which said elongate elements of the or each
self-supporting layer have sectoral cross-sections.
3. An overhead electric cable as claimed in claim
1 or 2, in which said elongate elements of the
self-supporting layer are all conductors.
4. An overhead electric cable as claimed in any
preceding claim, having a plurality of said layers with the innermost layer having said self-supporting characteristic.
5. An overhead electric cable as claimed in any preceding claim, in which said fluid-tight nonmetalic tube comprises a thermoplastics material.
6. An overhead electric cable as claimed in any preceding claim, in which the material of said fluid-tight non-metallic tube is cross-linked.
7. An overhead electric cable as claimed in claim 5, in which said thermoplastics material is a polyolefin.
8. An overhead electric cable as claimed in claim 7, in which said polyolefine is polyethylene.
9. An overhead electric cable as claimed in any one of claims 1 to 4, in which said fluid-tight non-metallic tube comprises an elastomeric material.
10. An overhead electric cable as claimed in claim 9, in which said elastomeric material comprises a cured silicone elastomer.
11. An overhead electric cable substantially as herein described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT26291/80A IT1134497B (en) | 1980-11-28 | 1980-11-28 | PERFECTED ELONGATED BODIES, CONTAINING ELEMENTS FOR TELECOMMUNICATIONS WITH OPTICAL SIGNATURES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2088584A true GB2088584A (en) | 1982-06-09 |
Family
ID=11219151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8134785A Withdrawn GB2088584A (en) | 1980-11-28 | 1981-11-18 | Overhead electric cable |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS57119304A (en) |
| AU (1) | AU7675081A (en) |
| BR (1) | BR8107691A (en) |
| DE (1) | DE3146947A1 (en) |
| DK (1) | DK528081A (en) |
| ES (1) | ES262083Y (en) |
| FR (1) | FR2495334A1 (en) |
| GB (1) | GB2088584A (en) |
| IT (1) | IT1134497B (en) |
| NO (1) | NO814060L (en) |
| SE (1) | SE8107025L (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2116746A (en) * | 1982-03-18 | 1983-09-28 | Bicc Plc | An improved flexible stranded body |
| FR2532062A1 (en) * | 1982-08-17 | 1984-02-24 | Chevron Res | OPTICAL FIBER TUBE CLOSES HERMETICALLY, ITS MANUFACTURING METHOD AND OPTICAL WIRE |
| FR2532061A1 (en) * | 1982-08-17 | 1984-02-24 | Chevron Res | ARM OPTICAL CABLE AND METHOD FOR MANUFACTURING THE SAME |
| GB2129158A (en) * | 1982-10-28 | 1984-05-10 | Int Standard Electric Corp | Optical fibre cable |
| EP0123588A2 (en) * | 1983-03-28 | 1984-10-31 | Schlumberger Limited | Optical fiber cable construction |
| US4504112A (en) * | 1982-08-17 | 1985-03-12 | Chevron Research Company | Hermetically sealed optical fiber |
| US4522464A (en) * | 1982-08-17 | 1985-06-11 | Chevron Research Company | Armored cable containing a hermetically sealed tube incorporating an optical fiber |
| EP0156097A1 (en) * | 1984-03-27 | 1985-10-02 | KABEL- und DRAHTWERKE Aktiengesellschaft | Cable |
| GB2173034A (en) * | 1985-03-01 | 1986-10-01 | Int Standard Electric Corp | Oil well logging cable |
| US4696542A (en) * | 1982-08-17 | 1987-09-29 | Chevron Research Company | Armored optical fiber cable |
| EP0251378A2 (en) * | 1986-06-24 | 1988-01-07 | Philips Patentverwaltung GmbH | Overhead electrical conductor with one optical communication line |
| EP0253437A2 (en) * | 1986-07-18 | 1988-01-20 | Philips Patentverwaltung GmbH | Electrical overhead line with an optical communication line |
| GB2199961A (en) * | 1987-01-13 | 1988-07-20 | Stc Plc | Optical fibre cable containing non circular cross section wires |
| WO2001057982A2 (en) * | 2000-02-03 | 2001-08-09 | Phillips-Fitel Inc. | Ground wire for transmission systems |
| WO2017167319A1 (en) * | 2016-03-31 | 2017-10-05 | Predistribuce, A.S. | Combined power cable |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1175835B (en) * | 1984-04-19 | 1987-07-15 | Pirelli Cavi Spa | SUBMARINE CABLE FOR FIBER OPTIC TELECOMMUNICATIONS |
| DE3446766A1 (en) * | 1984-12-21 | 1986-07-03 | Brown, Boveri & Cie Ag, 6800 Mannheim | Line wire for high-voltage overhead lines |
| JPS62197740A (en) * | 1986-02-25 | 1987-09-01 | Sumitomo Electric Ind Ltd | Optical fiber property measuring apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1580089A (en) * | 1977-12-02 | 1980-11-26 | Ericsson Telefon Ab L M | Cable |
| GB2029043B (en) * | 1978-09-05 | 1983-07-20 | Standard Telephones Cables Ltd | Overhead power cables |
| DE3015732C2 (en) * | 1980-04-24 | 1983-06-01 | Philips Kommunikations Industrie AG, 8500 Nürnberg | Overhead cable with optical fibers arranged in its interior |
-
1980
- 1980-11-28 IT IT26291/80A patent/IT1134497B/en active
-
1981
- 1981-10-23 AU AU76750/81A patent/AU7675081A/en not_active Abandoned
- 1981-11-18 GB GB8134785A patent/GB2088584A/en not_active Withdrawn
- 1981-11-25 SE SE8107025A patent/SE8107025L/en not_active Application Discontinuation
- 1981-11-26 FR FR8122136A patent/FR2495334A1/en active Pending
- 1981-11-26 BR BR8107691A patent/BR8107691A/en unknown
- 1981-11-26 DE DE19813146947 patent/DE3146947A1/en not_active Withdrawn
- 1981-11-27 NO NO814060A patent/NO814060L/en unknown
- 1981-11-27 ES ES1981262083U patent/ES262083Y/en not_active Expired
- 1981-11-27 DK DK528081A patent/DK528081A/en not_active Application Discontinuation
- 1981-11-28 JP JP56191660A patent/JPS57119304A/en active Pending
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2116746A (en) * | 1982-03-18 | 1983-09-28 | Bicc Plc | An improved flexible stranded body |
| FR2532062A1 (en) * | 1982-08-17 | 1984-02-24 | Chevron Res | OPTICAL FIBER TUBE CLOSES HERMETICALLY, ITS MANUFACTURING METHOD AND OPTICAL WIRE |
| FR2532061A1 (en) * | 1982-08-17 | 1984-02-24 | Chevron Res | ARM OPTICAL CABLE AND METHOD FOR MANUFACTURING THE SAME |
| WO1984000819A1 (en) * | 1982-08-17 | 1984-03-01 | Chevron Res | Armored optical fiber cable |
| WO1984000820A1 (en) * | 1982-08-17 | 1984-03-01 | Chevron Res | A hermetically sealed tube incorporating an optical fiber surrounded by an armored cable |
| US4696542A (en) * | 1982-08-17 | 1987-09-29 | Chevron Research Company | Armored optical fiber cable |
| US4504112A (en) * | 1982-08-17 | 1985-03-12 | Chevron Research Company | Hermetically sealed optical fiber |
| US4522464A (en) * | 1982-08-17 | 1985-06-11 | Chevron Research Company | Armored cable containing a hermetically sealed tube incorporating an optical fiber |
| US4523804A (en) * | 1982-08-17 | 1985-06-18 | Chevron Research Company | Armored optical fiber cable |
| GB2129158A (en) * | 1982-10-28 | 1984-05-10 | Int Standard Electric Corp | Optical fibre cable |
| EP0123588A3 (en) * | 1983-03-28 | 1987-09-02 | Schlumberger Limited | Optical fiber cable construction |
| EP0123588A2 (en) * | 1983-03-28 | 1984-10-31 | Schlumberger Limited | Optical fiber cable construction |
| EP0156097A1 (en) * | 1984-03-27 | 1985-10-02 | KABEL- und DRAHTWERKE Aktiengesellschaft | Cable |
| GB2173034A (en) * | 1985-03-01 | 1986-10-01 | Int Standard Electric Corp | Oil well logging cable |
| EP0251378A3 (en) * | 1986-06-24 | 1989-04-26 | Philips Patentverwaltung GmbH | Overhead electrical conductor with one optical communication line |
| EP0251378A2 (en) * | 1986-06-24 | 1988-01-07 | Philips Patentverwaltung GmbH | Overhead electrical conductor with one optical communication line |
| EP0253437A2 (en) * | 1986-07-18 | 1988-01-20 | Philips Patentverwaltung GmbH | Electrical overhead line with an optical communication line |
| EP0253437A3 (en) * | 1986-07-18 | 1989-09-20 | Philips Patentverwaltung GmbH | Electrical overhead line with an optical communication line |
| GB2199961A (en) * | 1987-01-13 | 1988-07-20 | Stc Plc | Optical fibre cable containing non circular cross section wires |
| US4915490A (en) * | 1987-01-13 | 1990-04-10 | Stc Plc | Optical fibre cable with crush-resistant tube |
| GB2199961B (en) * | 1987-01-13 | 1990-09-26 | Stc Plc | Optical fibre cable containing non-circular cross section wires. |
| WO2001057982A2 (en) * | 2000-02-03 | 2001-08-09 | Phillips-Fitel Inc. | Ground wire for transmission systems |
| WO2001057982A3 (en) * | 2000-02-03 | 2002-02-07 | Phillips Fitel Inc | Ground wire for transmission systems |
| WO2017167319A1 (en) * | 2016-03-31 | 2017-10-05 | Predistribuce, A.S. | Combined power cable |
| PL71351Y1 (en) * | 2016-03-31 | 2020-04-30 | Predistribuce A S | Combined power cable |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3146947A1 (en) | 1982-07-01 |
| IT8026291A0 (en) | 1980-11-28 |
| JPS57119304A (en) | 1982-07-24 |
| FR2495334A1 (en) | 1982-06-04 |
| IT1134497B (en) | 1986-08-13 |
| AU7675081A (en) | 1982-06-03 |
| DK528081A (en) | 1982-05-29 |
| ES262083U (en) | 1982-06-01 |
| BR8107691A (en) | 1982-08-24 |
| NO814060L (en) | 1982-06-01 |
| ES262083Y (en) | 1982-12-16 |
| SE8107025L (en) | 1982-05-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |