CN1197517A - Method of installing a resistive element on an optical cable - Google Patents

Method of installing a resistive element on an optical cable Download PDF

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Publication number
CN1197517A
CN1197517A CN96197167A CN96197167A CN1197517A CN 1197517 A CN1197517 A CN 1197517A CN 96197167 A CN96197167 A CN 96197167A CN 96197167 A CN96197167 A CN 96197167A CN 1197517 A CN1197517 A CN 1197517A
Authority
CN
China
Prior art keywords
optical cable
resistance element
tower
earthing device
cable
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.)
Pending
Application number
CN96197167A
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Chinese (zh)
Inventor
S·H·内维
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Balfour Beatty PLC
Original Assignee
BICC PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BICC PLC filed Critical BICC PLC
Publication of CN1197517A publication Critical patent/CN1197517A/en
Pending legal-status Critical Current

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    • 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
    • G02B6/4417—High voltage aspects, e.g. in cladding
    • G02B6/4419—Preventing corona discharge
    • 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
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/48—Overhead installation
    • G02B6/483—Installation of aerial type

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electric Cable Installation (AREA)
  • Elimination Of Static Electricity (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Led Device Packages (AREA)
  • Cable Accessories (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)

Abstract

A method of installing a resistive element along part of an optical cable that extends between, and is supported by, towers of an overhead electrical power transmission system, comprises attaching one end of the element to the optical cable at a tower, feeding the element out along the cable from the tower, and attaching intermediate parts of the element to the optical cable if necessary. The method is characterised in that: (i) the optical cable is earthed at a location adjacent to the tower by attaching to the cable a grounding device that is electrically connected to the tower; (ii) the resistive element is attached to the optical cable at a position on the optical cable between the tower and the location at which the optical cable is earthed by the grounding device, and is fed out along the optical cable from that position; (iii) as the resistive element is fed out along the optical cable, it contacts the grounding device which provides a path to earth for induced electrical currents thereon.

Description

The method of resistance element is installed on optical cable
The optical cable that the present invention relates to is supported by tower, electric pole or other upright holder that also is used for carrying cable along the network route.
In this network, press from both sides the optical cable ground connection on tower, electric pole or other stilt (after this being reduced to tower) with a metallic cable usually.When power transmission line loads,, therefore may on optical cable, generate capacity current owing to have distributed capacitance between optical cable and the power transmission line.The middle span place of induced potential on the optical cable between two towers reaches the highest, and the electric current that flows along optical cable then reaches maximum at place, tower district.Under the environment of drying, the impedance on the optical cable longitudinal length is higher comparatively speaking, as 10 12The scope of ohm/meter, so induced current is less comparatively speaking.But in the moist environment, the surface resistance of optical cable reduces greatly, and as the order of magnitude at 10 megaohm/rice, the electric current that generate this moment can be big more a lot of down than dry environment.The Joule heat on the optical cable surface that is caused by induced current can make in the optical cable surface short distance and become dry.This situation often occurs in the tower district of electric current maximum.When this happens, because the high resistance on the short dryer section place longitudinal length, the overwhelming majority of induced potential will be fallen herein on the optical cable, and the possibility of result can be called as the phenomenon of " dryer section arcing ", so that optical cable is produced severe impairment.
By a parallel conductive path that extends is installed to optical cable, can solve the problem of dryer section arcing on the optical cable.But the optical cable with a kind of like this conductive path but has its disadvantageous one side.If it is installed between two towers of the overhead transmission line with loading and since it with power transmission line between the danger that contacts is arranged, therefore just exist many safety problems of considering of needing; Moreover, for a kind of like this optical cable is reserved time enough and cutting off along the electric power of overhead transmission line transmission, this way usually is impossible or undesirable to installing.
In we common unsettled international patent application no PCT/GB94/02675, such application was once proposed:, allow certain resistance element extend its part span along optical cable from the tower of optical cable ground connection.This resistance element can be avoided producing the dryer section arcing along the optical cable of its length.In addition, if there is any dryer section to form on the optical cable of resistance element end, the electric potential difference at dryer section two ends also is not enough to produce arcing, and/or the undercurrent of inducting is to support the generation of any arcing.
For resistance element is installed, earlier of resistance element is fixed on the optical cable at tower place, for example can press from both sides or other device with cable wire.Begin resistance element is sent along optical cable from tower then, if desired, some middle part that electricity can be organized line is fixed on the optical cable.Yet this installation process generally is to carry out under the situation that grid loads, and therefore when resistance element is installed, must guarantee that all installation personnels can not suffer any voltage that may generate or electric current on resistance element.
According to installation method of the present invention, it is characterized in that:
(1) is fixed on the optical cable by forming the earthing device that conduction is connected to one with tower, makes near the optical cable a certain place ground connection again tower place;
(2) resistance element be fixed on the optical cable the position just at tower and optical cable by between the place of earthing device ground connection, then resistance element from this position along optical cable be sent and
(3) in the process that resistance element is sent along optical cable, resistance element contacts with earthing device, thereby provides a path to ground in the contact position for induced current.
Installation method according to the present invention has following benefit: need be on the resistance element by only that part between tower and earthing device of installation personnel operation, so installation personnel can be installed to resistance element on the optical cable under the danger of not getting an electric shock and dying.
After installing resistance element, can stay earthing device as you werely, so that use when wanting to change resistance element in the future, but common this way is not economical and practical.Therefore, the present invention generally also will further introduce some steps:
(a) resistance element is sent to after its whole length, forms a nonvolatil ground connection between resistance element and tower; Simultaneously
(b) after nonvolatil ground connection forms, remove earthing device.
In a kind of like this method, only need an earthing device.
Earthing device preferably has a cross section that is substantially " C " shape, removes so that can at any time earthing device be attached on the optical cable or from optical cable.For example, this device can be made tubulose, and the otch of a longitudinal extension is arranged on it, tube can be suspended on the optical cable by this otch, it is taken off after installing resistance element then again.In addition, this device preferably includes a weight, and this weight can guarantee that this device surrounds optical cable along correct orientation.For example, when device had " C " tee section, the installation of weight should make the breach (for example otch of pipe) in cross section rest on a side of optical cable, thereby prevented that earthing device from coming off from optical cable accidentally.In addition, the existence of weight also can improve device and be positioned at electrically contacting between its element (for example, optical cable, cable wire folder or resistance element).
When earthing device is installed resistance element is passed through from its inside.For example, earthing device can be suspended on the optical cable, earthing device just can be subjected to the support of optical cable like this, simultaneously can reserve a little space between the lower surface of optical cable and earthing device inwall, this space is enough to make resistance element and any cable wire folder that resistance element is fixed on the optical cable to pass through earthing device.In a method according to the present present invention, the inside dimension of earthing device is small enough to guarantee that resistance element contacts with the inwall of earthing device, perhaps change a kind of method, make earthing device comprise a flexible member, thereby guarantee electrically contacting of earthing device and resistance element.In the method for replacing, be used for that the cable wire anchor clamps that resistance element is fixed on the optical cable are had electric conductivity, any induced current that produces on resistance element so all will pass to the earth by cable wire folder and earthing device.In this method, earthing device preferably has the length above spacing between the cable wire folder, so that have at least a cable wire folder to contact with earthing device all the time.Under any circumstance, earthing device all should have sufficiently long length, contacts earthing device end place in addition with the installation personnel of avoiding standing on the tower.Typically, earthing device has 1～2 meter long length.
Referring now to accompanying drawing, a kind of installation method according to the present invention is described, wherein,
Fig. 1 is a kind of isometric view that can be used for the earthing device of this method.
Fig. 2 has provided the side view of earthing device shown in Figure 1 in the process that resistance element is installed.
With reference to accompanying drawing, the earthing device 1 that can be used in a kind of method of the present invention has a metal tube 2 that is about 1.2 meters, and this pipe is made by the metal of stainless steel and so on.The interior diameter of pipe is about 60 millimeters, and the otch of one 20 mm wide extends to the other end from an end of pipe.Are furnished with a pair of hangers 6 and 8 on the pipe.Hangers 6 carries weight 10, always surrounds optical cable with correct orientation thereby guarantee to manage 2, and another hangers 8 links to each other with a ground lug.
What Fig. 2 provided is the situation of earthing device when the resistance element of describing among the international patent application no PCT/GB94/02675 is installed.Herein, earthing device hangs on existing complete nonconducting self supporting type (ADSS) optical cable 14, and optical cable 14 extends to another one tower (not shown) from tower 16 always.At each tower place, optical cable all is hung on the cable grip 20, and cable grip 20 has also connect ground with optical cable.
Resistance element 12 has enough pliabilities, therefore be fixed in the place of tower at optical cable, resistance element can curve horizontal direction from vertical direction, resistance element also has enough rigidity on the other hand, and this makes it be sent quite long distance (be generally between two towers span 1/3) along optical cable by arrow points.For resistance element 12 is installed, make earthing device 1 ground connection earlier, method is to make earthing device 1 produce conduction with tower 16 by ground lug 18 to be connected.Then, by otch 4 earthing device 1 is suspended on the optical cable 14, earthing device just can be parked on the optical cable like this, and makes to be separated with between earthing device and the cable grip 20 and be about 1 meter distance.The optical cable at 22 places, zone connects together earthing device and cable grip 20, the result, and optical cable is maintained at zero potential, and installation personnel is operated earthing device under the danger of not getting an electric shock and dying.
At regional 22 places, an end of resistance element 12 is clipped on the optical cable 14 by conductive clip 24, and resistance element is sent along optical cable then, thus the pipe 2 of process earthing device.The length of pipe 2 is bigger than the spacing between the conductive clip 24, so that always have at least a folder to be positioned at the inside of pipe 2, does like this and can guarantee that any induced current that produces on the resistance element all is transported to the earth.When resistance element extends to its whole length, thus the near-end of resistance element for good and all linked on the tower and joined with ground, just can take off earthing device afterwards from optical cable.

Claims (7)

1. method that resistance element is installed along the part of cable line, this optical cable has the support of extending and be subjected to tower between the tower of electric transmission network and the tower at frame, this method comprises that the end with resistance element is fixed on the optical cable at tower place, and resistance element sent along optical cable from the tower place, and when needed the center section of resistance element is fixed on the optical cable, the method is characterized in that:
(1) is fixed on the optical cable by the earthing device that is connected with tower formation conduction, makes near the optical cable a certain place ground connection tower place;
(2) resistance element is fixed on the optical cable, its position just at tower and optical cable by between the place of earthing device ground connection, then resistance element sent along optical cable from this position and
(3) in the process that resistance element is sent along optical cable, resistance element contacts with earthing device, thereby provides a path to ground in the contact position for induced current.
2. according to the process of claim 1 wherein that the step that comprises has:
(a) resistance element is sent to after its whole length, forms a nonvolatil ground connection between resistance element and tower; Simultaneously
(b) after nonvolatil ground connection forms, remove earthing device.
3. according to the method for claim 1 or 2, wherein earthing device has the cross section that is substantially " C " shape, removes so that it can be attached on the optical cable or from optical cable.
4. according to the method for claim 3, wherein earthing device is a tubulose, and has the otch of a longitudinal extension, removes so that it can be attached on the optical cable or from optical cable.
5. according to the method for claim 3 or 4, wherein earthing device comprises a weight, and this weight can guarantee that earthing device has correct orientation on optical cable.
6. according to the method for any claim in the claim 3 to 5, wherein resistance element is sent the inside process of back by earthing device.
7. according to the method for any claim in the claim 3 to 6, wherein the length of earthing device is in 1～2 meter scope.
CN96197167A 1995-08-05 1996-08-05 Method of installing a resistive element on an optical cable Pending CN1197517A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9516095.8 1995-08-05
GBGB9516095.8A GB9516095D0 (en) 1995-08-05 1995-08-05 Method of installing a resistive element on an optical cable

Publications (1)

Publication Number Publication Date
CN1197517A true CN1197517A (en) 1998-10-28

Family

ID=10778824

Family Applications (1)

Application Number Title Priority Date Filing Date
CN96197167A Pending CN1197517A (en) 1995-08-05 1996-08-05 Method of installing a resistive element on an optical cable

Country Status (9)

Country Link
EP (1) EP0842447A1 (en)
CN (1) CN1197517A (en)
AR (1) AR003188A1 (en)
AU (1) AU6664696A (en)
BR (1) BR9610074A (en)
CA (1) CA2228616A1 (en)
GB (1) GB9516095D0 (en)
WO (1) WO1997006459A1 (en)
ZA (1) ZA966435B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2330705A (en) * 1997-10-27 1999-04-28 Pirelli General Plc Limiting dry band arcing on an all-dielectric self-supporting cable; arc gap devices
GB2346488B (en) * 1999-02-05 2001-09-12 Focas Ltd Protection of dielectric cables

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3506883A1 (en) * 1985-02-27 1986-08-28 Philips Patentverwaltung Gmbh, 2000 Hamburg Metal-free optical aerial cable which is laid in the vicinity of electrical high-voltage installations
US4776665A (en) * 1985-08-12 1988-10-11 Siemens Aktiengesellschaft Metal-free, self-bearing optical cable for high-tension overhead lines
US5018825A (en) * 1989-06-14 1991-05-28 Bicc Public Limited Company Overhead optical transmission system
NL9001007A (en) * 1990-04-26 1991-11-18 Nkf Kabel Bv COATING CONSTRUCTION, IN PARTICULAR FOR OPTICAL CABLES, FOR APPLICATION IN HIGH VOLTAGE ENVIRONMENTS.
GB9204047D0 (en) * 1992-02-26 1992-04-08 Bicc Plc Overhead optical transmission system
GB9308361D0 (en) * 1993-04-22 1993-06-09 Bicc Plc Optical cable
GB9325799D0 (en) * 1993-12-17 1994-02-23 Bicc Plc Semiconductive linear element

Also Published As

Publication number Publication date
GB9516095D0 (en) 1995-10-04
AR003188A1 (en) 1998-07-08
CA2228616A1 (en) 1997-02-20
WO1997006459A1 (en) 1997-02-20
EP0842447A1 (en) 1998-05-20
ZA966435B (en) 1997-02-18
AU6664696A (en) 1997-03-05
BR9610074A (en) 1999-07-27

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PB01 Publication
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C01 Deemed withdrawal of patent application (patent law 1993)
WD01 Invention patent application deemed withdrawn after publication