GB2262647A - Wind resistant cable - Google Patents
Wind resistant cable Download PDFInfo
- Publication number
- GB2262647A GB2262647A GB9225815A GB9225815A GB2262647A GB 2262647 A GB2262647 A GB 2262647A GB 9225815 A GB9225815 A GB 9225815A GB 9225815 A GB9225815 A GB 9225815A GB 2262647 A GB2262647 A GB 2262647A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cable
- plastics
- overall
- sheath
- mutually spaced
- 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- Withdrawn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
- 239000004033 plastic Substances 0.000 claims abstract description 42
- 229920003023 plastic Polymers 0.000 claims abstract description 42
- 239000004020 conductor Substances 0.000 claims abstract description 6
- 239000013307 optical fiber Substances 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910001092 metal group alloy Inorganic materials 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 description 4
- 239000012779 reinforcing material Substances 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect 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
- G02B6/4415—Cables for special applications
- G02B6/4416—Heterogeneous cables
- G02B6/4422—Heterogeneous cables of the overhead type
- G02B6/4425—Suppression of galloping oscillation
-
- 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
- G02B6/4426—Heterogeneous cables of the overhead type specially adapted for reducing drag caused by the wire, e.g. by oval cross-section
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/1845—Sheaths comprising perforations
Abstract
Depressions 7 are formed in the plastics sheath 6 on an electric conductor and/or optical fibre. The cable is especially suitable for use as an aerial cable because the drag on the cable caused by a wind is reduced. The depressions 7 preferably are in a regular pattern and preferably lie in a plurality of circumferentially spaced lines which extend parallel to the axis of, or helically around, the cable. <IMAGE>
Description
AN IMPROVED CABLE
This invention relates to cables of the kind comprising at least one electric conductor of metal or metal alloy and/or at least one optical fibre and having an overall sheath of plastics material.
The invention is especially, but not exclusively, concerned with plastics sheathed cables of this kind which are suitable for use as overhead plastics sheathed cables and which, for convenience, will hereinafter be referred to as "plastics sheathed aerial cables".
Plastics sheathed aerial cables can be suspended in long lengths between towers, poles or other upstanding supports mutually spaced along the route of the installation of which a plastics sheathed aerial cable forms a part; can be supported from a catenary cable, suspended between mutually spaced upstanding supports, by separately formed hangers mutually spaced along the lengths of the cables; can be secured to a catenary cable, suspended between mutually spaced supports, by at least one helically wound flexible binding element; or can be helically wound around an overhead electric conductor or catenary cable suspended between mutually spaced towers or other upstanding supports.
It is, however, to be clearly understood that the invention is also concerned with plastics sheathed cables which are suitable for drawing or feeding into ducts or other tubular protective enclosures which extend along the route of an installation of which a plastics sheathed cable forms a part and in which a plastics sheathed cable is to be housed.
It is an object of the present invention to provide an improved plastics sheathed cable which is of such a form that the cable is especially, but not exclusively, suitable for use as a plastics sheathed aerial cable of an overhead cable installation because the drag on the cable caused by a wind will be substantially less than that caused by the same wind on a plastics sheathed aerial cable of comparable size and weight per unit length hitherto proposed and used.
According to the invention, the overall plastics sheath of the improved plastics sheathed cable has throughout substantially the whole of its length and over substantially the whole of its exposed outer surface a multiplicity of mutually spaced discrete depressions.
preferably, the mutually spaced discrete depressions in the exposed outer surface of the plastics sheath are in a substantially regular pattern and, for ease of manufacture by a group or groups of embossing wheels or rollers, preferably also lie in a plurality of circumferentially spaced lines which may extend substantially parallel to the axis of, or helically around, the cable.
Each depression may be of substantially circular or non-circular shape and preferably has a depth that, over at least a part of the transverse dimension extending from the centre of the depression towards its periphery, decreases smoothly. By way of example, each depression preferably has an overall transverse dimension lying in the range 0.01 d to 0.2 d and a maximum depth lying in the range 0.01 d to 0.1 d, where d is the overall diameter of the plastics sheathed cable.
When the improved plastics sheathed cable is employed as a plastics sheathed aerial cable suspended in long lengths between towers, poles or other upstanding supports mutually spaced along the route of an overhead cable installation of which the cable forms a part and the cable is subjected to a wind, the multiplicity of mutually spaced discrete depressions in the exposed outer surface of the plastics sheath of the cable will reduce the drag on the cable that would otherwise be caused by the wind by modifying the flow of air around the exposed outer surface of the cable at a multiplicity of points along the length of the cable, thereby reducing, also, the strain to which the cable would otherwise be subjected.As a consequence, the improved plastics sheathed cable can be suspended in a longer span than a plastics sheathed cable of comparable size and weight per unit length hitherto proposed and used. Alternatively, for a span of the same length as that of a plastics sheathed cable of comparable size and weight per unit length hitherto proposed and used, an improved plastics sheathed cable can be used which can be of inherently less strength than the cable hitherto employed and, hence, of less cost.
The invention is further illustrated by a description, by way of example, of a preferred plastics sheathed cable with reference to the accompanying drawing, in which:
Figures 1 and 2, respectively, are plan and transverse cross-sectional views of the-preferred plastics sheathed cable, drawn on an enlarged scale, and
Figure 3 is a plan view, drawn on a greatly enlarged scale, of a depression of the plastics sheath of the cable shown in Figures 1 and 2.
Referring to the drawing, the preferred plastics sheathed cable comprises a central flexible elongate strength member 1 of non-metallic reinforcing material, six tubes 2 of plastics material helically laid around the central strength member, each plastics tube having loosely housed in its bore an optical fibre 3, a layer 4 of helically wound plastics tape holding together the assembled plastics tubes, a layer 5 of non-metallic reinforcing material providing circumferential strength to the cable and, surrounding the non-metallic reinforcing layer, an outermost sheath 6 of plastics material. The outermost plastics sheath 6 has throughout the whole of its length and over the whole of its exposed outer surface a multiplicity of mutually spaced discrete depressions 7. The discrete depressions 7 are in a regular pattern and lie in a plurality of circumferentially spaced lines which extend helically around the cable. Each depression 7 is of a noncircular shape, has an overall transverse dimension of 0.08d and a maximum depth of 0.04d, where d is the overall diameter of the plastics sheathed cable, the depth of the depression over an outer part of its transverse dimension extending from the centre of the depression towards its periphery decreasing smoothly.
The preferred plastics sheathed cable illustrated in the drawing is especially, but not exclusively, suitable for use as a plastics sheathed aerial cable.
Claims (6)
1. A cable comprising at least one electric conductor of metal or metal alloy and/or at least one optical fibre and, surrounding the electric conductor or conductors and/or the optical fibre or optical fibres, an overall sheath of plastics material, wherein the overall plastics sheath has throughout substantially the whole of its length and over substantially the whole of its exposed outer surface a multiplicity of mutually spaced discrete depressions.
2. A cable as claimed in Claim 1, wherein the mutually spaced discrete depressions in the exposed outer surface of the plastics sheath are in a substantially regular pattern.
3. A cable as claimed in Claim 2, wherein the mutually spaced discrete depressions in the exposed outer surface of the plastics sheath lie in a plurality of circumferentially spaced lines which extend substantially parallel to the axis of, or helically around, the cable.
4. A cable as claimed in any one of the preceding
Claims, wherein each discrete depression has a depth that, over at least a part of its transverse dimension extending from the centre of the depression towards its periphery, decreases smoothly.
5. A cable as claimed in any one of the preceding
Claims, wherein each discrete depression has an overall transverse dimension lying in the range 0.01 d to 0.2 d and a maximum depth lying in the range 0.01 d to 0.1 d, where d is the overall diameter of the plastics sheathed cable.
6. A cable substantially as hereinbefore described with reference to and as shown in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919126234A GB9126234D0 (en) | 1991-12-11 | 1991-12-11 | An improved aerial cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9225815D0 GB9225815D0 (en) | 1993-02-03 |
| GB2262647A true GB2262647A (en) | 1993-06-23 |
Family
ID=10706018
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919126234A Pending GB9126234D0 (en) | 1991-12-11 | 1991-12-11 | An improved aerial cable |
| GB9225815A Withdrawn GB2262647A (en) | 1991-12-11 | 1992-12-10 | Wind resistant cable |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919126234A Pending GB9126234D0 (en) | 1991-12-11 | 1991-12-11 | An improved aerial cable |
Country Status (2)
| Country | Link |
|---|---|
| AU (1) | AU3006892A (en) |
| GB (2) | GB9126234D0 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995034839A1 (en) * | 1994-06-10 | 1995-12-21 | Commscope, Inc. | Elliptical aerial self-supporting fiber optic cable and associated apparatus and methods |
| EP3104371A1 (en) * | 2015-06-12 | 2016-12-14 | LEONI Kabel Holding GmbH | Electric line and method for producing an electric line |
| CN106328279A (en) * | 2016-10-12 | 2017-01-11 | 无锡市长城电线电缆有限公司 | Multi-core flat buried agricultural cable |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9204047D0 (en) * | 1992-02-26 | 1992-04-08 | Bicc Plc | Overhead optical transmission system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4356346A (en) * | 1979-11-13 | 1982-10-26 | Kansai Electric Power, Ltd. | Transmission conductor |
| GB2175125A (en) * | 1985-05-14 | 1986-11-19 | Aluminum Co Of America | Low drag conductor |
| US4979794A (en) * | 1989-04-20 | 1990-12-25 | Evans Mike R | Friction reduction in drawing optical cable into protective tubes |
-
1991
- 1991-12-11 GB GB919126234A patent/GB9126234D0/en active Pending
-
1992
- 1992-12-10 AU AU30068/92A patent/AU3006892A/en not_active Abandoned
- 1992-12-10 GB GB9225815A patent/GB2262647A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4356346A (en) * | 1979-11-13 | 1982-10-26 | Kansai Electric Power, Ltd. | Transmission conductor |
| GB2175125A (en) * | 1985-05-14 | 1986-11-19 | Aluminum Co Of America | Low drag conductor |
| US4979794A (en) * | 1989-04-20 | 1990-12-25 | Evans Mike R | Friction reduction in drawing optical cable into protective tubes |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995034839A1 (en) * | 1994-06-10 | 1995-12-21 | Commscope, Inc. | Elliptical aerial self-supporting fiber optic cable and associated apparatus and methods |
| EP3104371A1 (en) * | 2015-06-12 | 2016-12-14 | LEONI Kabel Holding GmbH | Electric line and method for producing an electric line |
| DE102015210867A1 (en) * | 2015-06-12 | 2016-12-15 | Leoni Kabel Holding Gmbh | Electric line and method for producing an electrical line |
| US10014092B2 (en) | 2015-06-12 | 2018-07-03 | Leoni Kabel Holding Gmbh | Electrical line and method for manufacturing an electrical line |
| CN106328279A (en) * | 2016-10-12 | 2017-01-11 | 无锡市长城电线电缆有限公司 | Multi-core flat buried agricultural cable |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9225815D0 (en) | 1993-02-03 |
| AU3006892A (en) | 1993-06-17 |
| GB9126234D0 (en) | 1992-02-12 |
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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) |