Adhesive bonding and miscellaneous chemical manufacture – Methods – Making electrical conductors of indefinite length
Reexamination Certificate
1997-11-25
2001-02-27
Lorin, Francis J. (Department: 1775)
Adhesive bonding and miscellaneous chemical manufacture
Methods
Making electrical conductors of indefinite length
C156S195000
Reexamination Certificate
active
06193824
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method of installing an optical waveguide cable on a conductor of a high-voltage overhead line with the aid of securing elements applied in a helical manner.
It is currently known that an optical waveguide cable (FIG.
1
); is tied to a carrier cable or an earthing or grounding cable
2
of a high-voltage overhead line with the aid of a tying wire
3
applied in a spiral manner. Although in this case only a simple winding machine and an inexpensive tying means are used, disadvantages nevertheless result if the tying means tears or breaks. In the event of such a tear, the spiral springs open and the entire optical waveguide cable falls off along its length. Additionally, difficulties result due to different expansions under changes in temperature, thus possibly causing tensions or constrictions to occur.
A further possibility consists in that the optical waveguide cable (
FIG. 2
) is; wound spirally around the carrier cable or grounding cable
2
. In this case, the application operation is even further simplified since no tying means are required, but only relatively thin optical waveguide cables can be used. Additionally, the receiving capacity for the winding machine is very limited since the full length of optical waveguide cable has to be carried along. Additionally, there is the risk of the wound-on optical waveguide cable migrating in each case to the lowest point in a span due to the garland formation in the high-voltage overhead line. This migration causes additional tensile forces on the masts. It is furthermore known to attach an optical waveguide cable (
FIG. 3
) to a conductor of the high-voltage overhead line or to the grounding cable
2
with the aid of clips or straps
4
. In this case, however, it is disadvantageous that a very expensive installation machine with complicated mechanisms has to be used, this machine and the corresponding holding elements respectively having to be matched precisely to the cable diameter.
Methods of this type are known from the German Offenlegungsschrift 31 06 207 and the German Patent Specification 32 28 239.
SUMMARY OF THE INVENTION
The object of the invention is to find a simple method for installing an optical waveguide cable on a conductor of a high-voltage overhead line, in which, in the simplest attachment method by winding on a securing element, a safeguard against coming off in the event of a rupture of a securing element is provided. The object is achieved with a method of the type explained at the beginning, in that the optical waveguide cable fitted on along a conductor of the high-voltage overhead line is attached with the aid of at least one adhesive tape. The adhesive tape is wrapped helically around the conductor and the optical waveguide cable with its adhesive side facing inwards by means of a winding machine.
The advantages of the method according to the invention can be seen in the fact that an optical waveguide cable can be fitted on in a conventional, simple manner along an existing conductor of a high-voltage line, and that it can then be secured with the aid of an equally simple winding machine by means of an adhesive tape wrapped helically around the conductor and the optical waveguide cable. It is guaranteed by the adhesion of the adhesive tape on the conductor/optical waveguide cable unit that good fixing is brought about so that equal securing conductions prevail over the entire length of the span. It is furthermore ensured that, even in the event of a possible rupture of a securing element occurring, there will be no detachment of the optical waveguide cable since the firm adhesive bonding between the conductor and the optical waveguide cable remains intact before and after the rupture. A particularly secure attachment results if, for example, two adhesive tapes are applied with crossover wrapping since, in this case, there is then a further defined bonding between the two adhesive tapes additionally at the adhesive tape crossover points. Additionally, it is advantageous that, in arrangements of this type, almost any customary cable diameter combination is possible, and that no constrictions occur, which may be the case when using winding wires.
Materials considered possible for the preferably dielectric, i.e. insulating adhesive tapes are, for example, in particular the following:
Fluoropolymer films (e.g. Teflon) coated with silicone adhesive made by Beiersdorf.
Polyvinyl fluoride films (PVF), for example coated with acrylate adhesive made by 3M-Scotch.
Polyester films.
Reinforcements, e.g. made of glass fibres or aramide fibres (“Kevlar”) may also be provided in the films. It is also possible to use a mixture of reinforcements, e.g. combinations of glass fibres and aramide fibres. It is also possible to improve the tensile strength by using fabric tapes, which are made of aramide fibres and/or of glass fibres. The thread-like or fabric-like reinforcements can be impregnated with a liquid adhesive material in a simple manner, and thus produces the finished adhesive tape. For example, aramide or glass-fabric tapes may be provided with silicone adhesive made by Beiersdorf.
The adhesive tape described above is subjected to considerable mechanical loading during operation. A further development of the invention is therefore based on the object of specifying a way in which the mechanical properties of the adhesive tape can be improved in a simple manner. This object is achieved in that an adhesive tape is applied, which additionally has at least one reinforcing layer.
The reinforcing layer improves the mechanical properties to the desired and necessary extent. The application of this reinforcing layer expediently takes place retrospectively, i.e. it is applied to the finished adhesive tape in a further operation. In a particularly expedient manner, the reinforcing layer is applied to the adhesive layer of the adhesive tape, and thus produces simple positional securing. Furthermore, commercially available and therefore cost-effective adhesive tapes can be used as starting materials, which merely have to be provided with the reinforcing layer for the specific requirements of the attachment of an optical cable.
The invention furthermore relates to a high-voltage overhead line, having an optical cable attached to at least one overhead conductor, which is characterized in that the optical cable is held on the conductor by attaching it by means of at least one adhesive tape.
REFERENCES:
patent: 1235671 (1917-08-01), Fay
patent: 2669258 (1954-02-01), Spitz
patent: 3077068 (1963-02-01), Miller
patent: 3362861 (1968-01-01), Barker et al.
patent: 3474183 (1969-10-01), Kelly, Jr. et al.
patent: 3616123 (1971-10-01), Reynolds et al.
patent: 3772451 (1973-11-01), Canavan et al.
patent: 4262169 (1981-04-01), Lanton, Jr.
patent: 4268334 (1981-05-01), Harris et al.
patent: 31 06 207 (1982-09-01), None
patent: 32 28 239 (1984-02-01), None
patent: 37 02 781 (1988-08-01), None
patent: 263 838 (1989-01-01), None
patent: 1466033 (1989-03-01), None
Einsle Gunter
Mayr Ernst
Hill & Simpson
Lorin Francis J.
Siemens Aktiengesellschaft
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