FI104862B - A wire or rope for an overhead line or similar - Google Patents

Description

1 104862

A wire or rope for an overhead line or similar

The invention relates to a wire or rope for an overhead line or the like, comprising at least one ridge portion formed on the surface of the wire or rope 5 for damping the vibration of the wire or rope caused by the eddies due to cross wind.

Wire or rope vibration can occur on almost all overhead lines in unfavorable conditions. 10 This phenomenon can occur with different types of conductors, such as coated conductors, bare conductors, partially coated conductors and overhead cables, as well as with various types of ropes, such as lightning and twigs. In this case, 15 steady weak winds are applied against the wire or rope. This crosswind creates small swirls behind the wire or rope. karmic swirls that exert forces in the vertical plane of the wire or rope. As their frequency approaches the natural frequency of the span, the oscillation of the wire or rope is locked to this 20 frequency. Vibration can cause the wire or rope to break at the point of attachment even years after installation, and may prove to be a potential problem.

In the past, it has been known to fit the surface of, for example, 25 conductors in a spiral or wavy direction. a rotating brush part which prevents the formation of karmic swirls evenly behind the conductor, which also prevents the occurrence of harmful vibrations. The rotating brush section described above is formed on the surface of the conductor, for example in the pressing step of the insulating work step of the coated conductor. Such a solution is described, for example, in; ***: FI Patent Application 834396.

• · ·

The disadvantage of the prior art technique described above, for example, is that the coated overhead conductor is secured to an '35 insulator, which may be, for example, a stud or support insulator, with ties which may be prestressed metal or plastic or made of aluminum wire. If the surface of the coated overhead wire has a brush part or brush parts, the area touching the coated overhead wire will be reduced compared to 5 overhead lines that do not have a brush part or brush parts. As a result, the attachment of a wire or rope with brush parts to an insulator or other similar attachment point is weaker than that of a wire or rope without brush parts. As a result of the weaker attachment 10, the wire or rope may move in the longitudinal direction of the wire or rope and even slip from the tie if, for example, the wire is severed from a nearby tendon.

The object of the invention is to provide a wire or rope by means of which the disadvantages of the prior art can be eliminated. This is achieved by means of a wire or rope according to the invention, characterized in that the brush part is formed as a flexible part.

An advantage of the solution according to the invention is, above all, that the invention increases the contact area between the fastening means, e.g. Further, the solution according to the invention is simple and can be applied. in the context of very different manufacturing processes, i.e. the manufacturing process of the brush ____: 25 parts can advantageously be adapted to the manufacturing process of the respective wire or rope.

4 · ·

The invention will now be illustrated by means of the preferred embodiments shown in the following detailed drawing, wherein:

4 4 4 J

4 4 4 '30 Fig. 1 shows an embodiment of the invention in principle in the direction of the conductor, 4 4 4' Fig. 2 shows another embodiment of the invention in a perspective perspective view, 3548 · Fig. 3 Fig. 2 is a larger detail of the embodiment of Fig. 2, Fig. 4 shows a third sectional view of the conductor in partial sectional view 5, Fig. 5 shows a fourth sectional view of the conductor in axial direction, .

Figure 1 illustrates, in principle, a preferred embodiment of the invention. The embodiment of Figure 1 is a coated overhead line. Reference numeral 1 denotes a conductor and reference numeral 2 denotes an overlay of conductor 1. With reference numeral 3, the brush parts are indicated in Figure 1. The reference numeral 4, in turn, is marked with a bandage by means of which the wire can be attached to the insulator. The insulator is not marked in Figure 1.

According to the essential idea of the invention, the brush parts 20 3 are formed as bendable parts. The idea is that by making the brush parts 3 bendable parts, the area of contact between the band 4 and the conductor is increased, whereby the strength between the conductor and the insulator • J. increases. The area of the bandage 4 and the conductor increases as the brush • · · 2 5 bends at the bandage 4 as shown in Figure 1.

• ·. . ·. In the case of Fig. 1, the arrow 5 shows a substantially curved section of the brush.

• · *. The brush parts 3 can be made in the pressing step of the insulation work step. The brush part 3 can be made with a different press • · · * · '* 30 than the actual coating. It is essential that the brush is made thin in relation to the height of the brush, thereby providing advantageous properties. The brush part may be made of the same material as the actual coating. However, it is preferable to use a different material than the actual conductor coating for the manufacture of the brush part, since then a more elastic material may be used as the material for the 4 104862 brush members, or a material having a higher friction coefficient than the actual coating material. If the material of the brush portion is pressed over the coating of the arm 5 female wire as a continuous skin layer, the UV protection can be limited to the skin layer only. Thus, the actual conductor coating does not require the use of carbon black, which reduces the voltage resistance of the coating.

The brush portions 3 can be formed either as continuous portions extending over the entire length of the conductor or as discontinuous portions of the conductor longitudinally. The brush portions 3 may also be provided with longitudinal holes or transverse holes.

Figures 2 and 3 show another preferred embodiment of a conductor according to the invention. In Figures 2 and 3, the conductor is denoted by reference numeral 1 and the cover by reference numeral 2. An essential aspect of the embodiment shown in Figures 1 and 2 is that the brush element 13 has an optical element 6 disposed therein.

Figures 4 and 5 show further embodiments of the embodiment of Figures 2 and 3. The embodiment of Fig. 4 differs from the embodiment of Figs. 2 and 3 in that in the embodiment of Fig. 4, the brush portion 23 is formed at the base thin. The arrow at the base of the brush part is indicated by the arrow 7. In Fig. 4, the arrows and dashed lines indicate the turning movement of the brush member 23, which is facilitated by the thinning of the brush member. Figure 5 shows another alternative to thinning the brush part • ·: “. Figure 5 is a part of the brush • · *. "8 by means of the arrow 1 3 0 33 indicated taper of the base. Fig. 5 also indicates by means of arrows and dashed lines the turning movement of the brush part ·· «: <#> ϊ as in Fig. 4. It should be noted that in addition to the vibration damping of the wire, In particular, the embodiments of Figures 4 and 5 provide a margin of maneuver. Em. due to the maneuvers, the increase in the length of the wire caused by the creep of the conductor does not cause any stress on the optical fibers, but the increase in the length of the conductor is compensated by the radial change of the optical element 5 closer to the conductor. The brush part makes the optical element easily detachable from the coated overhead wire by cutting off the brush part. The thinned brush portion at the base is very advantageous in this regard. Such a situation is illustrated in Fig. 6, 10 in which the embodiment according to Fig. 4 is shown by means of a bandage 4 attached to the insulator 9. Cutting the brush part is a simpler procedure than, for example, removing the optical element from the middle of the conductor. Thanks to the brush part, the optical element can be connected to 15 cables during the manufacturing process. Thus, a separate optical component connection step is not required. Of course, the thinning of the brush head can also be used without the optical element, i.e. the ends of the brush members of the embodiment of Fig. 1 can of course also be thinned out, thus removing the brush members is a very easy operation as described above.

The foregoing embodiments are not intended to limit the invention in any way, but the invention may be modified freely within the scope of the claims. It is thus clear that not all details of the wire or rope according to the invention may be necessary. need to be exactly as shown in the diagrams, ♦ · · * • · · but other solutions are possible. In the figure, the invention is illustrated by means of an overhead coated wire. However, the invention is not limited in any way to the coated open wire, but can be applied to any structure where the aforementioned wind load is involved, for example, bare overhead conductors may be mentioned, " ./ partially coated overhead lines, overhead cables, ropes, such as lightning ropes, twigs, etc. The invention is also not limited to any particular type of wire or cable * * s 104862, but may be applied to power transmission cables, telecommunications cables, optical cables, with hybrid digital cables, etc. The bristle parts can be manufactured by any technique. For example, an element may be inserted inside the cable, for example during the stranding step, which may also be an optical element, forming a brush on the cable surface, etc. The optical element may also be any solution known per se.

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Claims (7)

A conductor or cable for an overhead line or the like, comprising at least one cam part (3, 13, 23, 33) formed on the surface of the conductor or cable to attenuate vibration of the conductor or cable caused by a turbulence formation on the due to a side wind, characterized in that the cam part (3, 13, 23, 33) is formed as a flexible part. Conductor or cable according to claim 1, characterized in that the cam part (3, 13, 23, 33) is formed as a continuous part which extends over the length of the conductor or cable. 3. Conductor or cable according to claim 1, characterized in that the cam part (3, 13, 23, 33) is formed as a discontinuous part in the length of the conductor or cable. Conductor or cable according to any of the preceding claims 1-3, characterized in that longitudinal cavities 20 are formed in the cam part (3, 13, 23, 33). 5. Conductor or cable according to any of the preceding claims 1-3, characterized in that transverse sharks are formed in the cam part (3, 12, 23, 33). Conductor or cable according to any of the preceding claims 1-5, characterized in that the cam part (23, 33 in the cross-section is thinly formed at the base). . 7. Conductor or cable according to any of the foregoing. claims 1-6, characterized in that an optical · · ·; · **. element (6) is provided at the cam part (13, 23, 33). : .v 30 • · • · · · · · · · · · · · · · · (4 <I> • »·