CA1112310A - Overhead electric transmission systems - Google Patents
Overhead electric transmission systemsInfo
- Publication number
- CA1112310A CA1112310A CA302,814A CA302814A CA1112310A CA 1112310 A CA1112310 A CA 1112310A CA 302814 A CA302814 A CA 302814A CA 1112310 A CA1112310 A CA 1112310A
- Authority
- CA
- Canada
- Prior art keywords
- elongate
- electric transmission
- flexible
- overhead
- transmission conductor
- 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.)
- Expired
Links
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
- G02B6/4403—Optical cables with ribbon structure
-
- 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
-
- 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
Abstract
ABSTRACT
A flexible stranded body, such as an electric conductor of an overhead electric transmission or distribution system, comprises at least one stranded layer of elongate elements of metal or metal alloy, at least one elongate compartment within and extending throughout the length of the stranded body and, loosely housed in the elongate compartment, at least one separate optical fibre and/or at least one optical bundle. Preferably, the elongate compartment extends within a circumferentially rigid central core which is surrounded by the stranded layer or layers but it may be a bore in an elongate element of a stranded layer or an elongate space bounded by two adjacent elongate elements.
A flexible stranded body, such as an electric conductor of an overhead electric transmission or distribution system, comprises at least one stranded layer of elongate elements of metal or metal alloy, at least one elongate compartment within and extending throughout the length of the stranded body and, loosely housed in the elongate compartment, at least one separate optical fibre and/or at least one optical bundle. Preferably, the elongate compartment extends within a circumferentially rigid central core which is surrounded by the stranded layer or layers but it may be a bore in an elongate element of a stranded layer or an elongate space bounded by two adjacent elongate elements.
Description
3~'~
Thi.s invention relates -to flexible stranded bodies of the kind which comprise a plura:Lity o:E stranded elongate e].ements of metal or metal alloy and which are adapted to be freely sup-ported from spaced supports in long lengths. The invention is especially, but not exclusively, concerned with overhead electric conductors of -the kind which. comprise one or more than one stranded layer of elongate elements o~ electrically conducti~e metal or metal alloY but it is to be understood that the invention does not exclude flexible stranded hodies. not normally intended to carry electric current, ~or instance. stranded wire ropes.
It is an object of the presen-t invention to provide a flexible stranded body wh.ich includes at least one optical guide for the transmission of th.e ultra-violet, visible and infra-red regions of the electro~agnetic spectrum, which regions, for con-venience, will hereinafter all be included in the generic term "light'l; it is: an especi.al, but not exclusive, ob~ect of the . invention to provide a ~lexible s:tranded body which includes at ;~ least one optical wave~uide for use in the communications field adapted for transmission o~ ligh.t havin~ a wavelength wîthin the 20 range a. 8 to 1.3 micrometres.
~ In accordance with the present invention, there is provided an overhead flexible electric transmission conductor adapted to be freely supported from spaced supporta in long lengths comprising at least one layer o~ helically wound bare elongate elements of metal or metal alloy, at least one elongate compartment :`
constituted by a space formed with.in and extending throughout the length o~ the conductor and, looselx housed in the elongate com-~ partment or at least one o~ th.e elongate compartments, at least :, ~
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one separate flexible. optical guide.
In accordance with the present invention, there is also provided an overhead flexible electric transmission conductor adapted -to be Ereely supported from spaced supports in long lengths comprising a substantially circum~erentia:lly rigid central core havin~ an elongate compartment within and extending throughout the -~ length of the core, at least one separate ~lexible optical guide loosely h.oused in th.e elongate compa~tment and, surrounding the : central core, at least one laye.r o e helically wound bare elongate elements of metal or metal alloy.
I:n accordance with. the present invention, there is also provided an overhead ~lexible electric transmission conductor comprising at least one layer of helically wound hare elongate elements of metal or metal alloy, at least one elongate compartment extendin~ throu~hout the length. of the layer and constituted by an elongat.e space bounded hy at least two adjacent elongate ele-ments of th.e layer or layers and, loosely housed in the elongate compartment or at least one of th~e elongate compartments, at least one fieparate flexible optical guide~
20 In accordance with. th.e present invention, there is also provided an overh.ead ~lexible electric transmission conductor comprising at least one layer of helically wound bare elongate elements Oe metal or metal alloy, at least one elongate compartment extendin~ throughout the le.n~th.of the layer and constituted by a bore ~ormed in an elongate eleme.nt Oe the layer or o~ at least one of th.e laye~s and, loo~ely housed in the elongate compartment or at l.east one oE th.e elongate compartments, at least one separate ~lexible. opti.cal ~uide.
- 2a -.~''i ~' 3:~
According to the in~ention a ~lexihle stranded bocly comprises at least one stranded layer of elongate elements o~ metal or metal alloy, a-t least one elon~a-te compartment within and extending throughout the len~th of the stranded body and, loosely housed in the elongate compartment or at least one of the elon~ate compartments, at least one separate ~lexihle optical guide.
The or each flexible optical guide may he a separate optical ~ibre or an optical bundle.
- 2b -- . . , -: . . -: . :: : :
The or each optical fibre may be of ~lass or other transparent material whose refractive index is arranged to decrease over at least a part of the radius of the fibre in a direction to~ards the outer surface of the fibre or it may be of` composite form comprising a core o~ transparent material clad throughout its length with another transparent material of lower refractive index which, by total internal reflection of li.ght being transmitted along the fibre, aonfines at least a major proportion of the light within the core. A
composite optical fibre is generally9 but not neoessarily~
made of two glasses of different refractive indices, the glass forming the core having a higher refractive index, than the glass forming the cladding; the refractive index of the glass of the core may gradually decrease towards the outer surface of the core over at least a part of the distance between the central axis of the core and its outer . - :
- surface. In an alternative form of composite fibre the core `~ may be a transparent liquid having a higher refractive i~dex ; than that of the cladding. All such optical fibres generally, but not necessarily, have diameters lying in the range 100 to 150 ~m. The or each optical fibre is usually of substantially circular cross-section but; in some circumstances3 it may be of non-circular cross-section.
By the expression "optical bundle'~ ;s meant a group :`
of optical fibres or a group of fibres including at least one optical fibre and at least one non-optical reinforcing flbre or other reinforcing elongate member. Each optical fibre of the optical bundle may be used independently as a separate ~ :~ ;` :
:
.- .......... . ~ ~ . , - . . : . .
., . . , - ~ , ,, . . .. , - ,- . ~ :
_ L~ _ light guide, each with its own modulated lig~t source and detector, or a plurality Or optical fibres of a bùndle may be used together as a single light guide3 with a single light source~
By virtue of being housed loosely in the elongate compartment, limited relakive movement between the or each separate optical fibre and the stranded body and/or between the or each optical bundle and the stranded body can take place when the stranded body vibrates, oscillates or is otherwise flexed as may~ for example, occur in the case when an overhead electric conductor or other ~reely supported flexible stranded body is subjected to winds. Limited relative movement between the or each separate optical fibre and the stranded body and/or between the or each opti~al bundle and the stranded body can also occur when the stranded body is subjected to a chan~ing tensile load during and afker its installation due to forces imposed on it by winches and brakes, etc., which are used in tensioning the stranded body to obtain a predetermined sagging condition;
i .*
after installationg changes in tensile load in the stranded body can also occur due to changes in external loading and in temperature. Limited relative movement between the or each separate optical fibre and the stranded body and/or between the or each optical bundle and the stranded body can also occur whilst the stranded body is in service and creep ~ gives rise to non-elastic extension of the stranded body.
.' :
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In one preferred aspect of the invention, an elongate compartment is within and extends throughout the length of a substantially circum~erentially rigid central core and the or each layer of elongate elements of metal or metal alloy surrounds the central core. In one preferred embodiment of this aspect of the invention, the central core comprises two or more elon~ate members of metal or metal alloy assembled together to form an elongate body having a central bore which constitutes the elongate compartmenk and, to prevent or limit the extent of lateral movement between the elongate members, each may be of such a transverse cross~sectional shape that they inter-engage. The central core may be built up of two elongate members, each having a transverse cross-sectional shape approximating to a semi-annulus, the abuttin~ faces of the two members being so shaped that they inter-engage; in this case, preferably, for ease Or manufacture, the two members are of i~entical transverse cross-sectional shape. In one alternative embodiment of the aforesaid aspect of the invention~ the central core is a flexible tube`comprising a stranded layer of elongate elements of metal or metal alloy, eaoh element having a transverse cross section approximating to a sector o~ an annulus. In this case, to prevent or limit the extent of lateral movement between the elon~ate members~ the flexible tube so formed is immediately surrounded by a second stranded layer of elongate metal elements~ each of which may be of a similar transverse cross-section to that of the elongate elements of ~he flexible tube, the direction of lay o~ this second layer being of opposite hand to that of the stranded layer constituting the ~lexible tube.
- 6 ~ 3~
In another alternative embodiment of the aforesaid aspect o~ the invention, the substantially circumferentially rigid central core comprises a flexi.ble tube formed by at least one helically wound flexible elongate member o~ metallic and/or non-metallic reinforcing material, for ln~tance a wire or metallic tape and/or compacted glass fibres impregnated with resin.
In a third alternative embodiment of the a~oresaid aspect of the invention, the central core is a single elongate member o~ substantially U-shaped transverse cross-section, the space between the limbs and base of the U constituting the elongate compartment. ~o retain the or each optical fibre and/or optical bundle in the elongate compartment, one or each of the limbs of the U may be folded inwardly (for instance, by passing the member through an approprlate ~ ~ die or dies prior to application of the stranded layer or ; layers of elongate elements) so that the gap between the ~ree .
~ends of the limbs is at least partially closed, alternatively, the or each optical fibre andJor optical bundle is retained in the elongate compartment by means of at least one tape of metal or metal al}oy which is helically applied to, or longitudinally applied to and transversely folded around~ the U-shaped elongate member.
In a second aspeot of the invention, the or each elongate compartment extending throughout the length of the flexible stranded body is a bore formed in an elongate element f the stranded layer or of at least one of the ~tranded layers or an elongate space bounded by at least two adjacent elongate elements of the stranded layer or layers. In a preferred ' ~ :
- : :
. ~ . , :, . . .
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embodiment of` this second aspect of the invention, the flexible stranded body comprises at least two stranded layers o~ elongate elements of metal or metal alloy, the directions o~ lay of adjacent layers being of the same or opposite hand, and the bore or bores and/or elongate space or spaces is or are in,~or between adjacent, elongate elements of an inner or the innermost stranded layer. The or each elongate element having a bore in which at least one separate optical fibre and/or a't least one optical bundle is loosely housed'may be of suitable transverse cross-section but 9 where the optical fibre or fibres and~or the optical bundle or bundles is or are loosely housed in an elongate space bounded by two adjacent elongate elements, these elongate elements preferably have a transverse cross-sectional shap~e approximating to a sector'of an annulus.
For ease of manu~acture, preferably one of the abutting faces of two adjacent elongate elements has an elongate recess which is closed by the flat sur~ace of the other of the abuttîng faces to form an elon~ate space.
In all cases~ usually outer layers or the outermost layer o~ two or more stranded layers of elongate elements each comprise a stranded layer of wires, each o~ substantially circular cross-section, but in some circumstances the wires of at least the outermost layer may each have a transverse .
cross-sectional shape approximating to a sector of an annulus.
Although the or each separate op~ical fibre and/or optical bundle may itself be loosely housed in the or an .
elongate compartmen~, preferably the separate optical fibre or fibres and/or bundle or bundles is or are supported by a lexible elongate carrier member whlch is loose~.y house~ in .. . . .
.
the elongate compartment so that the required relakive limited movement between the separate optical fibre or optical fibres and/or bundle or bundles and the flexible stranded body can take place.
Preferably, the ~lexible elongate carrier member comprises an extruded elongate body o~ rubber or plastics material which has 3 extending throughout its length, at least one bore in which at least one separate optical fibre and/or at least one optical bundle is or are loosely housed and 9 preferably also~ this extruded elongate body has at least one elongate reinforcing member embedded in and extending thr`ou~hout the length of the body. In one form of ~lexible carrier member, the axes of the bore or bores and of the reinforcing member or members may lie in a substantially common plane. In another form of ~lexible carrier member, a plurality of bores may be arranged around a central elongate reinforcing member. The or each reinforcin~ member may be a wire or a stranded group o~ wires or it may be of non-metalli~
material. Where the or a bore loosely houses two or more separate optical fibres and/or optical bundlesj they may be secured on or within at least one substantially flat flexible support member which iS i~sel~ looseIy housed in the bore.
, One alternative flexible elongate carrier member that may be used cornprises a plurality of separately ~orward tubes or r~bber or plastics material as~embled together and surrounded b~- an outerprotective sheathg at least one of the :: :
tubes looæely housing at least one separate optical fibre and~or ; at least one optical bundle. At least one elongate reinforcing ~ ~ member may be assembled~with the plurality of tubes.
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g Another alternative flexible elongate carrier member that may be used comprises at least one substantially flat ~lexîble support member on or within which two or more separate optical fibres and/or optical bundles are secured.
The substantially flat flexlble suppork member is preferably in the form of at least one tape~ for instance of paper or plastics materialg glass or of meta:L or metal alloy. In some circumstances9 it is preferred that the or each tape is of a material having a coef~icient o~ thermal expansion approximating to that of the material or materials of the optical fibres For example, where the optical fibres are of a silica-based material, the or each tape may be of steel.
Where the flexible support member consists of a single tape, ~he separate optical ~ibres and/or optical bundles may be secured by adhesive to one surface of ~he tape viewed in transverse cross-section the tape may be corrugated so that it has a plurality of troughs extending along its length, in each of some or all of which a separate optical fibre or optical bundle may be secured. Where the flexible support member consists o~ two tapes, one overlying the other, the separate optical ~ibres and/or optical bundles may be ~andwiched between the two tapes and may be secured by adhesive to at least one o~ the adjacent surfaces of the .
tapes; one or each of these two tapes may be transversely corrugated as described above. Where one or each of two tapes is transversely corrugated~ the two tapes may be so bonded ~ .
together that the optical bundles and/or separate optical fibres are secured within the flexible support ~ember so formed but are capable of limited movement within the troughs ~: :
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.
, in which they lie. Where optical fibres and/or bundles are secured within a substantially flat flexible support member, prererably the flexible support member comprises a single tape of plaskics material with the separate optical fibres and~or optical bundles wholly or partially embedded in it.
As a means of initially identifying any op~ical bundle and/or æeparate optical cable secured side~by-side on or within at least one substantially flat flexible suppork member, the support member may carry a longitudinally extending datum mark on its surface and/or at least one of the optical bundles and/or optical fibres may be assymmetrically positioned with respect to the or each other optical bundle and/or optical fibre so that ît constitutes a longitudinally extending datum.
The or each separate optical ~ibre and/or opticaI
bundle, and when present the flexible elongate carrier member thereof, may be of a length substantially 8reater than that of the elongate compartment in which it is loosely housed but preferably the or each separake opki¢al fibre and/or optical bundle, the carrier member thereof when present, and the elongate compartment are of equal or approximakely equal lengths7 Where the flexible stranded body is an overhead electric conductor9 preferably the stranded elongate elements are of copper or a copper alloy, or aluminium or an aluminium alloy but, in some circumstances, the elongate elements of at` least one layer of stranded elemenks may be of high ~ensile .: .
steel or other metal or metal alloy of high tensile strength or at least some of the elongate elements of said layer or layers may be of one metal or metal alloy of hi~h tensile . ~
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strength and the remainder of said elongate elements may be of another metal or metal alloyJ or other metals or metal alloys, o~ high tensile strengkh.
To provide for relative sliding movement between ad~acent elongake elements o~ the stranded layer or layers and to assist in preventing water from gaining access to the interior of the ~lexible stranded body and thereby reduce risk of corrosion Or the elongate elements, the interstices between the elongate elements ma~ be ~illed w-lth a greasy materialO
The ~le~ible stranded body o~ the present invention is especially suitable for use as an earth conductor o~ an overhead electric transmission line and~ because it may be manufactured to have the same or approximately the same properties of sag and tension as those o~ conventional overhead conductors Or subskantially the same overall diameter, it provides the important advantage that the ~lexible stranded body can be used to replace an earth conductor or other overhead electric conductor of an existing overhead electric transmission system thereby to provide a communication means in the syskem; ThUSJ the invention provides a re}atively inexpensive communication link between stations, substations and other locations along an electric transmission system~
Accordingly, the invention also includes an overhead electric transmisslon or distribuki.on system which includes at least one overhead stranded-conductor incorporating an optical guide as hereinbe~ore described.
Where the overhead skranded conductor incorporating ~ :
an op~lcal guide is an earth conductor o~ the system~ the earth conductor may be suspended between the tops o~ towers ~ ' . ~ .
.
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or other supportih~ structures or it may be supported between the towers or other supporting structures at positions below the cross-arms ofl the towers.
The invention will be furthe-r illustrated by a description, by way of exampleg of eight forms of overhead stranded electric conductor with reference to the accompanying drawings~ in which:-Figures 1 to 8J respectively, are transversecross-sectional views of the eight forms of overhead conductor;
Figure 9 is a transverse cross~sectional view of an optical fibre element used in the overhead conductors shown in Figures 7 and 8, drawn on a greatly enlarged scale~ and F-lgures 10 to 15, respectively, are transverse cross-sectional views of si~ alternative forms of optical ~ibre element for use in an overhead conduckor.
Re~erring to the drawings, the overhead stranded conductor shown in Figure 1 comprises a central core 1 built up o~ two elongate members Z of aluminium-based alloy each having a transverse cross-sectional shape approximating to ~ -a semi-annulus and together de~ining a bore 6. Each member
Thi.s invention relates -to flexible stranded bodies of the kind which comprise a plura:Lity o:E stranded elongate e].ements of metal or metal alloy and which are adapted to be freely sup-ported from spaced supports in long lengths. The invention is especially, but not exclusively, concerned with overhead electric conductors of -the kind which. comprise one or more than one stranded layer of elongate elements o~ electrically conducti~e metal or metal alloY but it is to be understood that the invention does not exclude flexible stranded hodies. not normally intended to carry electric current, ~or instance. stranded wire ropes.
It is an object of the presen-t invention to provide a flexible stranded body wh.ich includes at least one optical guide for the transmission of th.e ultra-violet, visible and infra-red regions of the electro~agnetic spectrum, which regions, for con-venience, will hereinafter all be included in the generic term "light'l; it is: an especi.al, but not exclusive, ob~ect of the . invention to provide a ~lexible s:tranded body which includes at ;~ least one optical wave~uide for use in the communications field adapted for transmission o~ ligh.t havin~ a wavelength wîthin the 20 range a. 8 to 1.3 micrometres.
~ In accordance with the present invention, there is provided an overhead flexible electric transmission conductor adapted to be freely supported from spaced supporta in long lengths comprising at least one layer o~ helically wound bare elongate elements of metal or metal alloy, at least one elongate compartment :`
constituted by a space formed with.in and extending throughout the length o~ the conductor and, looselx housed in the elongate com-~ partment or at least one o~ th.e elongate compartments, at least :, ~
~ : - 2 -:~ ~ 4 :, :
- -.
3~
one separate flexible. optical guide.
In accordance with the present invention, there is also provided an overhead flexible electric transmission conductor adapted -to be Ereely supported from spaced supports in long lengths comprising a substantially circum~erentia:lly rigid central core havin~ an elongate compartment within and extending throughout the -~ length of the core, at least one separate ~lexible optical guide loosely h.oused in th.e elongate compa~tment and, surrounding the : central core, at least one laye.r o e helically wound bare elongate elements of metal or metal alloy.
I:n accordance with. the present invention, there is also provided an overhead ~lexible electric transmission conductor comprising at least one layer of helically wound hare elongate elements of metal or metal alloy, at least one elongate compartment extendin~ throu~hout the length. of the layer and constituted by an elongat.e space bounded hy at least two adjacent elongate ele-ments of th.e layer or layers and, loosely housed in the elongate compartment or at least one of th~e elongate compartments, at least one fieparate flexible optical guide~
20 In accordance with. th.e present invention, there is also provided an overh.ead ~lexible electric transmission conductor comprising at least one layer of helically wound bare elongate elements Oe metal or metal alloy, at least one elongate compartment extendin~ throughout the le.n~th.of the layer and constituted by a bore ~ormed in an elongate eleme.nt Oe the layer or o~ at least one of th.e laye~s and, loo~ely housed in the elongate compartment or at l.east one oE th.e elongate compartments, at least one separate ~lexible. opti.cal ~uide.
- 2a -.~''i ~' 3:~
According to the in~ention a ~lexihle stranded bocly comprises at least one stranded layer of elongate elements o~ metal or metal alloy, a-t least one elon~a-te compartment within and extending throughout the len~th of the stranded body and, loosely housed in the elongate compartment or at least one of the elon~ate compartments, at least one separate ~lexihle optical guide.
The or each flexible optical guide may he a separate optical ~ibre or an optical bundle.
- 2b -- . . , -: . . -: . :: : :
The or each optical fibre may be of ~lass or other transparent material whose refractive index is arranged to decrease over at least a part of the radius of the fibre in a direction to~ards the outer surface of the fibre or it may be of` composite form comprising a core o~ transparent material clad throughout its length with another transparent material of lower refractive index which, by total internal reflection of li.ght being transmitted along the fibre, aonfines at least a major proportion of the light within the core. A
composite optical fibre is generally9 but not neoessarily~
made of two glasses of different refractive indices, the glass forming the core having a higher refractive index, than the glass forming the cladding; the refractive index of the glass of the core may gradually decrease towards the outer surface of the core over at least a part of the distance between the central axis of the core and its outer . - :
- surface. In an alternative form of composite fibre the core `~ may be a transparent liquid having a higher refractive i~dex ; than that of the cladding. All such optical fibres generally, but not necessarily, have diameters lying in the range 100 to 150 ~m. The or each optical fibre is usually of substantially circular cross-section but; in some circumstances3 it may be of non-circular cross-section.
By the expression "optical bundle'~ ;s meant a group :`
of optical fibres or a group of fibres including at least one optical fibre and at least one non-optical reinforcing flbre or other reinforcing elongate member. Each optical fibre of the optical bundle may be used independently as a separate ~ :~ ;` :
:
.- .......... . ~ ~ . , - . . : . .
., . . , - ~ , ,, . . .. , - ,- . ~ :
_ L~ _ light guide, each with its own modulated lig~t source and detector, or a plurality Or optical fibres of a bùndle may be used together as a single light guide3 with a single light source~
By virtue of being housed loosely in the elongate compartment, limited relakive movement between the or each separate optical fibre and the stranded body and/or between the or each optical bundle and the stranded body can take place when the stranded body vibrates, oscillates or is otherwise flexed as may~ for example, occur in the case when an overhead electric conductor or other ~reely supported flexible stranded body is subjected to winds. Limited relative movement between the or each separate optical fibre and the stranded body and/or between the or each opti~al bundle and the stranded body can also occur when the stranded body is subjected to a chan~ing tensile load during and afker its installation due to forces imposed on it by winches and brakes, etc., which are used in tensioning the stranded body to obtain a predetermined sagging condition;
i .*
after installationg changes in tensile load in the stranded body can also occur due to changes in external loading and in temperature. Limited relative movement between the or each separate optical fibre and the stranded body and/or between the or each optical bundle and the stranded body can also occur whilst the stranded body is in service and creep ~ gives rise to non-elastic extension of the stranded body.
.' :
.. ... . . ..
3~i~
.
In one preferred aspect of the invention, an elongate compartment is within and extends throughout the length of a substantially circum~erentially rigid central core and the or each layer of elongate elements of metal or metal alloy surrounds the central core. In one preferred embodiment of this aspect of the invention, the central core comprises two or more elon~ate members of metal or metal alloy assembled together to form an elongate body having a central bore which constitutes the elongate compartmenk and, to prevent or limit the extent of lateral movement between the elongate members, each may be of such a transverse cross~sectional shape that they inter-engage. The central core may be built up of two elongate members, each having a transverse cross-sectional shape approximating to a semi-annulus, the abuttin~ faces of the two members being so shaped that they inter-engage; in this case, preferably, for ease Or manufacture, the two members are of i~entical transverse cross-sectional shape. In one alternative embodiment of the aforesaid aspect of the invention~ the central core is a flexible tube`comprising a stranded layer of elongate elements of metal or metal alloy, eaoh element having a transverse cross section approximating to a sector o~ an annulus. In this case, to prevent or limit the extent of lateral movement between the elon~ate members~ the flexible tube so formed is immediately surrounded by a second stranded layer of elongate metal elements~ each of which may be of a similar transverse cross-section to that of the elongate elements of ~he flexible tube, the direction of lay o~ this second layer being of opposite hand to that of the stranded layer constituting the ~lexible tube.
- 6 ~ 3~
In another alternative embodiment of the aforesaid aspect o~ the invention, the substantially circumferentially rigid central core comprises a flexi.ble tube formed by at least one helically wound flexible elongate member o~ metallic and/or non-metallic reinforcing material, for ln~tance a wire or metallic tape and/or compacted glass fibres impregnated with resin.
In a third alternative embodiment of the a~oresaid aspect of the invention, the central core is a single elongate member o~ substantially U-shaped transverse cross-section, the space between the limbs and base of the U constituting the elongate compartment. ~o retain the or each optical fibre and/or optical bundle in the elongate compartment, one or each of the limbs of the U may be folded inwardly (for instance, by passing the member through an approprlate ~ ~ die or dies prior to application of the stranded layer or ; layers of elongate elements) so that the gap between the ~ree .
~ends of the limbs is at least partially closed, alternatively, the or each optical fibre andJor optical bundle is retained in the elongate compartment by means of at least one tape of metal or metal al}oy which is helically applied to, or longitudinally applied to and transversely folded around~ the U-shaped elongate member.
In a second aspeot of the invention, the or each elongate compartment extending throughout the length of the flexible stranded body is a bore formed in an elongate element f the stranded layer or of at least one of the ~tranded layers or an elongate space bounded by at least two adjacent elongate elements of the stranded layer or layers. In a preferred ' ~ :
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. ~ . , :, . . .
: - :. .
embodiment of` this second aspect of the invention, the flexible stranded body comprises at least two stranded layers o~ elongate elements of metal or metal alloy, the directions o~ lay of adjacent layers being of the same or opposite hand, and the bore or bores and/or elongate space or spaces is or are in,~or between adjacent, elongate elements of an inner or the innermost stranded layer. The or each elongate element having a bore in which at least one separate optical fibre and/or a't least one optical bundle is loosely housed'may be of suitable transverse cross-section but 9 where the optical fibre or fibres and~or the optical bundle or bundles is or are loosely housed in an elongate space bounded by two adjacent elongate elements, these elongate elements preferably have a transverse cross-sectional shap~e approximating to a sector'of an annulus.
For ease of manu~acture, preferably one of the abutting faces of two adjacent elongate elements has an elongate recess which is closed by the flat sur~ace of the other of the abuttîng faces to form an elon~ate space.
In all cases~ usually outer layers or the outermost layer o~ two or more stranded layers of elongate elements each comprise a stranded layer of wires, each o~ substantially circular cross-section, but in some circumstances the wires of at least the outermost layer may each have a transverse .
cross-sectional shape approximating to a sector of an annulus.
Although the or each separate op~ical fibre and/or optical bundle may itself be loosely housed in the or an .
elongate compartmen~, preferably the separate optical fibre or fibres and/or bundle or bundles is or are supported by a lexible elongate carrier member whlch is loose~.y house~ in .. . . .
.
the elongate compartment so that the required relakive limited movement between the separate optical fibre or optical fibres and/or bundle or bundles and the flexible stranded body can take place.
Preferably, the ~lexible elongate carrier member comprises an extruded elongate body o~ rubber or plastics material which has 3 extending throughout its length, at least one bore in which at least one separate optical fibre and/or at least one optical bundle is or are loosely housed and 9 preferably also~ this extruded elongate body has at least one elongate reinforcing member embedded in and extending thr`ou~hout the length of the body. In one form of ~lexible carrier member, the axes of the bore or bores and of the reinforcing member or members may lie in a substantially common plane. In another form of ~lexible carrier member, a plurality of bores may be arranged around a central elongate reinforcing member. The or each reinforcin~ member may be a wire or a stranded group o~ wires or it may be of non-metalli~
material. Where the or a bore loosely houses two or more separate optical fibres and/or optical bundlesj they may be secured on or within at least one substantially flat flexible support member which iS i~sel~ looseIy housed in the bore.
, One alternative flexible elongate carrier member that may be used cornprises a plurality of separately ~orward tubes or r~bber or plastics material as~embled together and surrounded b~- an outerprotective sheathg at least one of the :: :
tubes looæely housing at least one separate optical fibre and~or ; at least one optical bundle. At least one elongate reinforcing ~ ~ member may be assembled~with the plurality of tubes.
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.
.
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. - :
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.
3~
g Another alternative flexible elongate carrier member that may be used comprises at least one substantially flat ~lexîble support member on or within which two or more separate optical fibres and/or optical bundles are secured.
The substantially flat flexlble suppork member is preferably in the form of at least one tape~ for instance of paper or plastics materialg glass or of meta:L or metal alloy. In some circumstances9 it is preferred that the or each tape is of a material having a coef~icient o~ thermal expansion approximating to that of the material or materials of the optical fibres For example, where the optical fibres are of a silica-based material, the or each tape may be of steel.
Where the flexible support member consists of a single tape, ~he separate optical ~ibres and/or optical bundles may be secured by adhesive to one surface of ~he tape viewed in transverse cross-section the tape may be corrugated so that it has a plurality of troughs extending along its length, in each of some or all of which a separate optical fibre or optical bundle may be secured. Where the flexible support member consists o~ two tapes, one overlying the other, the separate optical ~ibres and/or optical bundles may be ~andwiched between the two tapes and may be secured by adhesive to at least one o~ the adjacent surfaces of the .
tapes; one or each of these two tapes may be transversely corrugated as described above. Where one or each of two tapes is transversely corrugated~ the two tapes may be so bonded ~ .
together that the optical bundles and/or separate optical fibres are secured within the flexible support ~ember so formed but are capable of limited movement within the troughs ~: :
., . . . ~ .
~, : . ' . . . " . :
-: , . .
.
, in which they lie. Where optical fibres and/or bundles are secured within a substantially flat flexible support member, prererably the flexible support member comprises a single tape of plaskics material with the separate optical fibres and~or optical bundles wholly or partially embedded in it.
As a means of initially identifying any op~ical bundle and/or æeparate optical cable secured side~by-side on or within at least one substantially flat flexible suppork member, the support member may carry a longitudinally extending datum mark on its surface and/or at least one of the optical bundles and/or optical fibres may be assymmetrically positioned with respect to the or each other optical bundle and/or optical fibre so that ît constitutes a longitudinally extending datum.
The or each separate optical ~ibre and/or opticaI
bundle, and when present the flexible elongate carrier member thereof, may be of a length substantially 8reater than that of the elongate compartment in which it is loosely housed but preferably the or each separake opki¢al fibre and/or optical bundle, the carrier member thereof when present, and the elongate compartment are of equal or approximakely equal lengths7 Where the flexible stranded body is an overhead electric conductor9 preferably the stranded elongate elements are of copper or a copper alloy, or aluminium or an aluminium alloy but, in some circumstances, the elongate elements of at` least one layer of stranded elemenks may be of high ~ensile .: .
steel or other metal or metal alloy of high tensile strength or at least some of the elongate elements of said layer or layers may be of one metal or metal alloy of hi~h tensile . ~
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strength and the remainder of said elongate elements may be of another metal or metal alloyJ or other metals or metal alloys, o~ high tensile strengkh.
To provide for relative sliding movement between ad~acent elongake elements o~ the stranded layer or layers and to assist in preventing water from gaining access to the interior of the ~lexible stranded body and thereby reduce risk of corrosion Or the elongate elements, the interstices between the elongate elements ma~ be ~illed w-lth a greasy materialO
The ~le~ible stranded body o~ the present invention is especially suitable for use as an earth conductor o~ an overhead electric transmission line and~ because it may be manufactured to have the same or approximately the same properties of sag and tension as those o~ conventional overhead conductors Or subskantially the same overall diameter, it provides the important advantage that the ~lexible stranded body can be used to replace an earth conductor or other overhead electric conductor of an existing overhead electric transmission system thereby to provide a communication means in the syskem; ThUSJ the invention provides a re}atively inexpensive communication link between stations, substations and other locations along an electric transmission system~
Accordingly, the invention also includes an overhead electric transmisslon or distribuki.on system which includes at least one overhead stranded-conductor incorporating an optical guide as hereinbe~ore described.
Where the overhead skranded conductor incorporating ~ :
an op~lcal guide is an earth conductor o~ the system~ the earth conductor may be suspended between the tops o~ towers ~ ' . ~ .
.
.: . :
:, . .
3~b~
or other supportih~ structures or it may be supported between the towers or other supporting structures at positions below the cross-arms ofl the towers.
The invention will be furthe-r illustrated by a description, by way of exampleg of eight forms of overhead stranded electric conductor with reference to the accompanying drawings~ in which:-Figures 1 to 8J respectively, are transversecross-sectional views of the eight forms of overhead conductor;
Figure 9 is a transverse cross~sectional view of an optical fibre element used in the overhead conductors shown in Figures 7 and 8, drawn on a greatly enlarged scale~ and F-lgures 10 to 15, respectively, are transverse cross-sectional views of si~ alternative forms of optical ~ibre element for use in an overhead conduckor.
Re~erring to the drawings, the overhead stranded conductor shown in Figure 1 comprises a central core 1 built up o~ two elongate members Z of aluminium-based alloy each having a transverse cross-sectional shape approximating to ~ -a semi-annulus and together de~ining a bore 6. Each member
2 has extending along one of its limbs a substantially V-shaped groove 3 and aIong the other o~ its limbs a rib 4 of complementary shape~ the arrangement being such that the rib o~ one member engages in the groove of the other member so that lateral movement between the members is substantiall~
prevented. The central:core:is surrounded by two stranded layers 5 of round wires of aluminium-based alloy, the directions of lay of the stranded layers being o~ opposite hand. Loosely housed in the bore 6 is a plastics tube 7 having a bore 8 in which is loosel~y housed an optical fibre 9 -....... . - . -. . . .
of a length substàntially equal to that o~ ~he bores 6 and 8.
In the overhead stranded conductor shown in Figure 2 a central core 11 is constibuted by a single elongate aluminium alloy member 12 of substantially U-shaped cross~
section9 the space 16 between the limbs o~ the U constituting an elongate oompartment. Surrounding the central core 11 are three stranded layers 15 of round wires o~ a:Luminium-based alloy, the directions of lay o~ ad~acent stranded layers being o~ opposite hand. A plastics tube 17 having a bore 18 is loosely housed in the elongate compartment 16 and an opkical ~ibre 19 is loosely housed in the bore 18.
The overhead stranded conductors shown in Figures
prevented. The central:core:is surrounded by two stranded layers 5 of round wires of aluminium-based alloy, the directions of lay of the stranded layers being o~ opposite hand. Loosely housed in the bore 6 is a plastics tube 7 having a bore 8 in which is loosel~y housed an optical fibre 9 -....... . - . -. . . .
of a length substàntially equal to that o~ ~he bores 6 and 8.
In the overhead stranded conductor shown in Figure 2 a central core 11 is constibuted by a single elongate aluminium alloy member 12 of substantially U-shaped cross~
section9 the space 16 between the limbs o~ the U constituting an elongate oompartment. Surrounding the central core 11 are three stranded layers 15 of round wires o~ a:Luminium-based alloy, the directions of lay o~ ad~acent stranded layers being o~ opposite hand. A plastics tube 17 having a bore 18 is loosely housed in the elongate compartment 16 and an opkical ~ibre 19 is loosely housed in the bore 18.
The overhead stranded conductors shown in Figures
3 and 4 are similar in construction to the overhead conductor shown in Figure 2 except L or the form o~ the central core andJ
for convenience~ components of the ov0rhead conductors shown in Figures 3 and 4~ respectively~ that are similar to those o~ the overhead conductor shown in Figure 2 have been given re~erènces greater by 10 and by 20 than the references o~
the corresponding components o~ the overhead conductor shown in Figure 2~ In the overhead conductor shown in Figure ~, the central core 21 is a tube 22 ~ormed by transversely ~olding a strip of aluminium-based alloy, In the o~erhead oonductor shown in Figure 4, the oentral core ~1 is constitued by a single elongate aluminium alloy member 32 o~ substantially U-shaped cross-section, the gap between the ~ree ends of the limbs o~ the U being partially closed to retain the plastios tube 37 in the elongate compartment ~6.
The overhead stranded conductor shown in Figure $
has a central core ~1 comprising a inner stranded layer 42 . ~
.
.
3 ~
o~ elongate elements of aluminium-based alloyJ each element having a transverse cross-section o~ a shape approximating to that o~ a sector o~ an annulus and the directlons o~ lay of the layers being o~ opposite hand. Surrounding the - stranded layers 1~2 and 4~ are two stranded layers 45 of --round wires of aluminium-based alloy, the directions o~ lay o~ these two stranded layers being o~ opposite hand. Loosely housed in the bore 46 is an optical ~ibre element ~4 comprising an extruded plastics body 47 having a bore ~8 in which are loosely housed three optical ~ibres 49. Two steel reinforcing wires 50 are embedded in the body 47 on Gpposite sides of the bore 483 the axes of the bore and o~ the rein~orcing wires l~ing in a co~mon plane.
In the overhead stranded conductor shown in Figure 6, the central core 51 comprises a flexible tube formed by a closely helically wound steel wire 52. m e central core 51 is surrounded by three stranded layers 55 o~ round wires of aluminium-based alloy, the directions of lay o~ adjacent layers being of opposite hand. Loosely housed in the bore 56 o~ the central core 51 is an optical ~ibre element 54 comprising an extruded pla~tic body 57 having a bore 58 and embedded rein~orcing wires 60~ the axes o~ the bore and wires lying in a common plane, and, loosel~ housed in the bore, two optical fibres 59.
The overhead stranded conductor shown ln Figure 7 comprises a core 61 o~ seven steel wires, a stranded layer 62 o~ aluminium èlements 6~, each o~ a transverse cross-section approxlmatin6 t" a seotor o~ a circle, so surrounding the core that it is loosely housed within the bore formed by the ' ; ~
.- . - : . :- . .
: .. , . . - .
- , :-: :
~r~3 15 ~ .
stranded layer and1 surrounding are layer ~2, a stranded layer 65 o~ round wires o~ aluminium-based alloy, the directions o~
lay of the layers 62 and 65 being of opposite hand. Each element 6~ has a bore 64 in which is loosely housed an optical ~ibre element 66 o~ the forrn shown in Figure 9. The --optical ~ibre element 66 comprises an extruded plastics body 67 of a transverse cross-section of elongate shape having a bore 68 and embedded rein~orcing wires 70, the axes of the bore and reinforcing wires lying in a common plane~ and, loosely housed in the bore 68g two optical fibres 69.
m e overhead stranded conductor shown in Figure is of similar construction to that shown in Figure 7 andg where appropriate, similar components have been given references greater by ten. In the overhead conductor shown in ~igure 8, each bore 7~/ loosely housi~g an optical fibre element 66 o~ the ~orm shown in Figure 9~ comprises a recess in one of the abutting ~aces of two ad~acent elements 77, of aluminium-based alloyg the recess being closed by the other o~ said abutting faces.
In each of the overhead stranded conductors shown in Figures 1 to 89 instead of the separate ~ibre or ~ibres loosely housed in the bore o~ a plastics tube or instead of the plastics tube loosely housing optical ~ibres or other optical fibre elementsJ any o~ the optical fibre elements shown in Figures 10 ko 15 may be employedJ the op~ioal ~ibre elements being drawn on a greakly enlarged scale to clari~y their structure. The optical ~ibre element shown in ~igure 10 comprises a ~lexible tape 82 of plastics mater]al which has seoured by adhesivè to one of its major sur~aces ~our optical ,' . . .
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.
fibres 81 which are spaced apart and extend substantially parallel to the axis o~ the tape. In the optical ~ibre element shown in Figure 11, ~our optical ~ibres 91 are sandwiched between and secured by a~hesive tc the ad~acent surfaces o~ two ~lexible tapes 92, '33 of plastics material.
The tape 97 has a longitudinally extending rib 97 to provide ~or ready identification of any optical ~ibre 91. The optical ~ibre element shown in Figure 12 comprises a flexible plastics tape 102 which, viewed in transverse cross-section, is so corrougated that it has a plurality o~ troughs 104 extending along its length in each o~ which an optical fibre 101 is secured by adhesive. The optical fibre element shown ,in Figure 17 comprises a corrugated fle~ible plastics tape 112 which has a plurality of troughs 114 extending along its length, the troughs being closed by a flat plastics tape 113 which is bonded to the peaks 115. Optical fibres 111 are secured by adhesive in the troughs 114. In the optical ~ibre element shown in Figure 14~ optical ~ibres 121 are sandwiched bet~een~ and secured by adhesive in the troughs 124~ 128 O~J
two flexible corrugated plastics tapes 122, 12~ whose peaks 1255 129 are secured together by adhesive. To provide for re~ y identif'ication of' any optical f'ibre 121, the tape 127 has a longitudinally extending rib 127. The array shown in Figure 15 comprises a plastics tape 172 in which f'our optical fibres 171 extending side~by~side are wholly embedded~ The tape 1~2 has a longitudinally extending rib 137 to provide ~or ready identi~ication o~ any optical fibre 131.
. - : - .. . .
: . . . . .
, ~ , . . . ~ . ' ; '
for convenience~ components of the ov0rhead conductors shown in Figures 3 and 4~ respectively~ that are similar to those o~ the overhead conductor shown in Figure 2 have been given re~erènces greater by 10 and by 20 than the references o~
the corresponding components o~ the overhead conductor shown in Figure 2~ In the overhead conductor shown in Figure ~, the central core 21 is a tube 22 ~ormed by transversely ~olding a strip of aluminium-based alloy, In the o~erhead oonductor shown in Figure 4, the oentral core ~1 is constitued by a single elongate aluminium alloy member 32 o~ substantially U-shaped cross-section, the gap between the ~ree ends of the limbs o~ the U being partially closed to retain the plastios tube 37 in the elongate compartment ~6.
The overhead stranded conductor shown in Figure $
has a central core ~1 comprising a inner stranded layer 42 . ~
.
.
3 ~
o~ elongate elements of aluminium-based alloyJ each element having a transverse cross-section o~ a shape approximating to that o~ a sector o~ an annulus and the directlons o~ lay of the layers being o~ opposite hand. Surrounding the - stranded layers 1~2 and 4~ are two stranded layers 45 of --round wires of aluminium-based alloy, the directions o~ lay o~ these two stranded layers being o~ opposite hand. Loosely housed in the bore 46 is an optical ~ibre element ~4 comprising an extruded plastics body 47 having a bore ~8 in which are loosely housed three optical ~ibres 49. Two steel reinforcing wires 50 are embedded in the body 47 on Gpposite sides of the bore 483 the axes of the bore and o~ the rein~orcing wires l~ing in a co~mon plane.
In the overhead stranded conductor shown in Figure 6, the central core 51 comprises a flexible tube formed by a closely helically wound steel wire 52. m e central core 51 is surrounded by three stranded layers 55 o~ round wires of aluminium-based alloy, the directions of lay o~ adjacent layers being of opposite hand. Loosely housed in the bore 56 o~ the central core 51 is an optical ~ibre element 54 comprising an extruded pla~tic body 57 having a bore 58 and embedded rein~orcing wires 60~ the axes o~ the bore and wires lying in a common plane, and, loosel~ housed in the bore, two optical fibres 59.
The overhead stranded conductor shown ln Figure 7 comprises a core 61 o~ seven steel wires, a stranded layer 62 o~ aluminium èlements 6~, each o~ a transverse cross-section approxlmatin6 t" a seotor o~ a circle, so surrounding the core that it is loosely housed within the bore formed by the ' ; ~
.- . - : . :- . .
: .. , . . - .
- , :-: :
~r~3 15 ~ .
stranded layer and1 surrounding are layer ~2, a stranded layer 65 o~ round wires o~ aluminium-based alloy, the directions o~
lay of the layers 62 and 65 being of opposite hand. Each element 6~ has a bore 64 in which is loosely housed an optical ~ibre element 66 o~ the forrn shown in Figure 9. The --optical ~ibre element 66 comprises an extruded plastics body 67 of a transverse cross-section of elongate shape having a bore 68 and embedded rein~orcing wires 70, the axes of the bore and reinforcing wires lying in a common plane~ and, loosely housed in the bore 68g two optical fibres 69.
m e overhead stranded conductor shown in Figure is of similar construction to that shown in Figure 7 andg where appropriate, similar components have been given references greater by ten. In the overhead conductor shown in ~igure 8, each bore 7~/ loosely housi~g an optical fibre element 66 o~ the ~orm shown in Figure 9~ comprises a recess in one of the abutting ~aces of two ad~acent elements 77, of aluminium-based alloyg the recess being closed by the other o~ said abutting faces.
In each of the overhead stranded conductors shown in Figures 1 to 89 instead of the separate ~ibre or ~ibres loosely housed in the bore o~ a plastics tube or instead of the plastics tube loosely housing optical ~ibres or other optical fibre elementsJ any o~ the optical fibre elements shown in Figures 10 ko 15 may be employedJ the op~ioal ~ibre elements being drawn on a greakly enlarged scale to clari~y their structure. The optical ~ibre element shown in ~igure 10 comprises a ~lexible tape 82 of plastics mater]al which has seoured by adhesivè to one of its major sur~aces ~our optical ,' . . .
- . ., - . .
. . " ' . ,' . ~
- ~ . -.. . . .
,.
.
fibres 81 which are spaced apart and extend substantially parallel to the axis o~ the tape. In the optical ~ibre element shown in Figure 11, ~our optical ~ibres 91 are sandwiched between and secured by a~hesive tc the ad~acent surfaces o~ two ~lexible tapes 92, '33 of plastics material.
The tape 97 has a longitudinally extending rib 97 to provide ~or ready identification of any optical ~ibre 91. The optical ~ibre element shown in Figure 12 comprises a flexible plastics tape 102 which, viewed in transverse cross-section, is so corrougated that it has a plurality o~ troughs 104 extending along its length in each o~ which an optical fibre 101 is secured by adhesive. The optical fibre element shown ,in Figure 17 comprises a corrugated fle~ible plastics tape 112 which has a plurality of troughs 114 extending along its length, the troughs being closed by a flat plastics tape 113 which is bonded to the peaks 115. Optical fibres 111 are secured by adhesive in the troughs 114. In the optical ~ibre element shown in Figure 14~ optical ~ibres 121 are sandwiched bet~een~ and secured by adhesive in the troughs 124~ 128 O~J
two flexible corrugated plastics tapes 122, 12~ whose peaks 1255 129 are secured together by adhesive. To provide for re~ y identif'ication of' any optical f'ibre 121, the tape 127 has a longitudinally extending rib 127. The array shown in Figure 15 comprises a plastics tape 172 in which f'our optical fibres 171 extending side~by~side are wholly embedded~ The tape 1~2 has a longitudinally extending rib 137 to provide ~or ready identi~ication o~ any optical fibre 131.
. - : - .. . .
: . . . . .
, ~ , . . . ~ . ' ; '
Claims (36)
1. An overhead flexible electric transmission conductor adapted to be freely supported from spaced supports in long lengths comprising at least one layer of helically wound bare elongate elements of metal or metal alloy, at least one elongate compartment constituted by a space formed within and extending throughout the length of the conductor and, loosely housed in the elongate compartment or at least one of the elongate compartments, at least one separate flexible optical guide.
2. An overhead flexible electric transmission conductor adapted to be freely supported from spaced supports in long lengths comprising a substantially circumferentially rigid central core having an elongate compartment within and extending throughout the length of the core, at least one separate flexible optical guide loosely housed in the elongate compartment and, surrounding the central core, at least one layer of helically wound bare elongate elements of metal or metal alloy.
3. An overhead flexible electric transmission conductor as claimed in Claim 2, wherein the central core comprises at least two bare elongate members of metal or metal alloy assembled together to form an elongate body having a central bore which constitutes the elongate compartment.
4. An overhead flexible electric transmission conductor as claimed in Claim 3, wherein each bare elongate member of the central core is of such a transverse cross-sectional shape that they inter-engage at least to limit the extent of lateral movement between the elongate members.
5. An overhead flexible electric transmission conductor as claimed in Claim 4, wherein the central core comprises two inter-engaging bare elongate members, each having a transverse cross-sectional shape approximating to a semi annulus.
6. An overhead flexible electric transmission conductor as claimed in Claim 5, wherein the two bare elongate members of the central core are of identical transverse cross-sectional shape.
7. An overhead flexible electric transmission conductor as claimed in Claim 2, wherein the central core is a flexible tube comprising a layer of helically wound bare elongate elements of metal or metal alloy, each element having a transverse cross-section approximating to a sector of an annulus.
8. An overhead flexible electric transmission conductor as claimed in Claim 7, wherein the flexible tube is surrounded by a second layer of helically wound bare elongate metal elements, each having a transverse cross-section approximating to a sector of an annulus, the direction of lay of the second layer being of opposite hand to that of the layer constituting the flexible tube.
9. An overhead flexible electric transmission conductor as claimed in Claim 2, wherein the central core comprises a flexible tube formed by at least one helically wound flexible elongate member of reinforcing material.
10. An overhead flexible electric transmission conductor as claimed in Claim 9, wherein the helically wound flexible elongate member is a wire.
11. An overhead flexible electric transmission conductor as claimed in Claim 9, wherein the helically wound flexible elongate member comprises compacted glass fibres impregnated with resin.
12. An overhead flexible electric transmission conductor as claimed in Claim 2, wherein the central core is a single bare elongate member of substantially U-shaped transverse cross-section, the space between the limbs and base of the U
constituting the elongate compartment.
constituting the elongate compartment.
13. An overhead flexible electric transmission conductor as claimed in Claim 12, wherein at least one of the limbs of the U is folded inwardly so that the gap between the free ends of the limbs is at least partially closed.
14. An overhead flexible electric transmission conductor as claimed in Claim 12, wherein the limbs of the U are folded together so that the free ends of the limbs abut.
15. An overhead flexible electric transmission conductor as claimed in Claim 14, wherein the single bare elongate member is so folded that it is of substantially circular internal and external cross-section.
16. An overhead flexible electric transmission conductor as claimed in Claim 12, wherein the gap between the free ends of the limbs of the U is closed by at least one tape of metal or metal alloy which is applied around the U-shaped elongate member.
17. An overhead flexible electric transmission conductor comprising at least one layer of helically wound bare elongate elements of metal or metal alloy, at least one elongate compartment extending throughout the length of the layer and constituted by an elongate space bounded by at least two adjacent elongate elements of the layer or layers and, loosely housed in the elongate compartment or at least one of the elongate compartments, at least one separate flexible optical guide.
18. An overhead flexible electric transmission conductor as claimed in Claim 17, wherein the flexible conductor comprises at least two layers of helically wound bare elongate elements of metal or metal alloy, the elongate space or spaces being between adjacent bare elongate elements of an inner or the innermost layer.
19. An overhead flexible electric transmission conductor as claimed in Claim 17, wherein said bare elongate elements have a transverse cross-sectional shape approximating to a sector of an annulus, one of the abutting faces of said adjacent elongate elements having an elongate recess which is closed by the flat surface of the other of the abutting faces to form an elongate space.
20. An overhead flexible electric transmission conductor comprising at least one layer of helically wound bare elongate elements of metal or metal alloy, at least one elongate compartment extending throughout the length of the layer and constituted by a bore formed in an elongate element of the layer or of at least one of the layers and, loosely housed in the elongate compartment or at least one of the elongate compartments, at least one separate flexible optical guide.
21. An overhead flexible electric transmission conductor as claimed in Claim 2, 17 or 20, wherein outer layers or the outermost layer of at least two layers of helically wound bare elongate elements each comprise a layer of helically wound wires, each of substantially circular cross-section.
22. An overhead flexible electric transmission conductor as claimed in Claim 1, wherein the or each separate flexible optical guide in the elongate compartment or in at least one of the elongate compartments is supported by a flexible elongate carrier member which is loosely housed in the elongate compartment.
23. An overhead flexible electric transmission conductor as claimed in Claim 22, wherein the flexible elongate carrier member comprises an extruded elongate body of rubber or plastics material which has, extending throughout its length, at least one bore in which the or each separate flexible optical guide is loosely housed.
24. An overhead flexible electric transmission conductor as claimed in Claim 23, wherein the extruded elongate body has at least one elongate reinforcing member embedded in and extending throughout the length of the body.
25. An overhead flexible electric transmission conductor as claimed in Claim 24, wherein the axes of the bore or bores and of the reinforcing member or members in the extruded elongate body lie in a substantially common plane.
26. An overhead flexible electric transmission conductor as claimed in Claim 25, wherein the extruded elongate body has a central elongate reinforcing member and a plurality of bores arranged around the reinforcing member.
27. An overhead flexible electric transmission conductor as claimed in Claim 23, wherein the or a bore of the extruded body of the flexible elongate carrier member loosely houses at least one substantially flat flexible support member on or within which at least two separate flexible optical guides are secured.
28. An overhead flexible electric transmission conductor as claimed in Claim 22, wherein the flexible elongate carrier member is at least one substantially flat flexible support member on or within which at least two separate flexible optical guides are secured.
29. An overhead flexible electric transmission conductor as, claimed in Claim 27 or 28, wherein the substantially flat flexible support member is at least one flexible tape to one surface of which said separate optical guides are secured by adhesive.
30. An overhead flexible electric transmission conductor as claimed in Claim 22, wherein the flexible elongate carrier member comprises a plurality of separately formed tubes of rubber or plastics material assembled together and surrounded by an outer protective sheath, at least one of the tubes loosely housing at least one separate flexible optical guide.
31. An overhead flexible electric transmission conductor as claimed in Claim 30, wherein at least one elongate reinforcing member is assembled with the plurality of tubes.
32. An overhead flexible electric transmission conductor as claimed in Claim 1 or 2, wherein the flexible optical guide or at least one of the flexible optical guides is a separate optical fibre.
33. An overhead flexible electric transmission conductor as claimed in Claim 1 or 2, wherein the flexible optical guide or at least one of the flexible optical guides is an optical bundle.
34. An overhead flexible electric transmission conductor as claimed in Claim 1 or 2, wherein the or each separate flexible optical guide is of a length substantially greater than that of the elongate compartment in which it is loosely housed.
35. An overhead electric transmission or distribution system including at least one overhead flexible electric transmission conductor as claimed in Claim 1.
36. An overheard electric transmission or distribution system as claimed in Claim 35, wherein the overhead flexible electric transmission conductor is an earth conductor of the system.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB20234/77 | 1977-05-13 | ||
| GB2023477A GB1598438A (en) | 1977-05-13 | 1977-05-13 | Overhead electric transmission systems |
| GB286178 | 1978-01-24 | ||
| GB2861/78 | 1978-01-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1112310A true CA1112310A (en) | 1981-11-10 |
Family
ID=26237798
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA302,814A Expired CA1112310A (en) | 1977-05-13 | 1978-05-08 | Overhead electric transmission systems |
Country Status (11)
| Country | Link |
|---|---|
| US (5) | US4359598A (en) |
| JP (1) | JPS53141641A (en) |
| BE (1) | BE894452Q (en) |
| CA (1) | CA1112310A (en) |
| DE (1) | DE2820510C2 (en) |
| FR (1) | FR2390816A1 (en) |
| HK (1) | HK21083A (en) |
| IT (1) | IT1102646B (en) |
| MY (1) | MY8300185A (en) |
| NL (1) | NL7805279A (en) |
| SE (2) | SE444243B (en) |
Families Citing this family (129)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1112310A (en) * | 1977-05-13 | 1981-11-10 | Peter Fearns | Overhead electric transmission systems |
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Also Published As
| Publication number | Publication date |
|---|---|
| US4416508A (en) | 1983-11-22 |
| FR2390816A1 (en) | 1978-12-08 |
| SE8801255L (en) | 1988-04-05 |
| JPS53141641A (en) | 1978-12-09 |
| SE8801255D0 (en) | 1988-04-05 |
| HK21083A (en) | 1983-07-01 |
| DE2820510C2 (en) | 1983-07-07 |
| IT7849313A0 (en) | 1978-05-12 |
| USRE32293E (en) | 1986-11-25 |
| NL7805279A (en) | 1978-11-15 |
| IT1102646B (en) | 1985-10-07 |
| DE2820510A1 (en) | 1978-11-16 |
| FR2390816B1 (en) | 1982-10-22 |
| US4359598A (en) | 1982-11-16 |
| MY8300185A (en) | 1983-12-31 |
| USRE32374E (en) | 1987-03-17 |
| JPS6113564B2 (en) | 1986-04-14 |
| US4491387A (en) | 1985-01-01 |
| SE7805480L (en) | 1978-11-14 |
| SE444243B (en) | 1986-03-24 |
| BE894452Q (en) | 1983-01-17 |
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