FI105365B - Guidance for guidance line - Google Patents

Description

105365

Cable for overhead line

The invention relates to a conductor for an overhead conductor line, in particular a coated conductor, comprising at least one oscillation of the conductor caused by the eddy wind due to the cross wind caused by the at least one brush portion extending over the length of the conductor T 5.

Conductor vibration can occur in almost all 10 overhead lines under unfavorable conditions. This will result in a steady weak wind against the conductor. This crosswind creates small swirls behind the conductor. karmic swirls, which cause vertical forces on the conductor. As their frequency approaches the natural frequency of span 15, the oscillation of the conductor is locked to this frequency. Vibration can cause the wire wires to bend at the tie points even years after installation and may thus prove to be a potential problem.

In the past, it has been known to fit a brush part that spirally or wavyly rotates the surface of the conductor 20 to prevent the formation of karmic vortexes evenly behind the conductor, thereby preventing harmful vibration from occurring. As described above. , ·, A rotating brush portion is formed on the surface of the conductor during the pressing step of an insulating 1 <c "V 25 operation. Such a solution is described, for example, in FI patent application 834396.

However, the disadvantage of the prior art solutions 1 · <'· has been that the formation of the brush part has, for example, slowed down the speed of the insulation work, thus not making the overall economy of the manufacturing process possible.

It is an object of the invention to provide a conductor capable of eliminating the disadvantages of the prior art. This is achieved by the conductor according to the invention; 35, which is characterized in that the brush part is «1 t · *» «· 2 · ·, · I ·« · · 105365 2 formed in a longitudinal direction of the conductor which is at each point fitted to the outer conductor from the surface.

The invention has the advantage above all that the structure 5 can be formed in such a way that the production rate does not differ significantly from the production rate of the conductor without the brush parts. A further advantage of the invention is its simplicity, whereby the implementation of the invention becomes advantageous. A further advantage of the invention is its functionality in mounting conditions and furthermore the fact that the cross-section introduced by the straight brush members is smaller than that of the coil, whereby the wind pressure of the conductor according to the invention is lower than previous solutions.

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

Figure 1 is a schematic perspective view of a first embodiment of the invention, Figure 2 is a schematic view of the shape of a brush portion of the embodiment of Figure 20, and Figure 3 is a schematic view of the shape and arrangement of brush parts of a second embodiment of the invention.

. . ·. Figure 1 illustrates, in principle, an embodiment of a conductor according to the invention 1125. The conductor is represented by »♦ 1 -" V generally denoted by reference numeral 1. In the example of Fig. 1, the conductive portion of the conductor *. Comprises a strand 3 stranded by the yarns 2. It is obvious that the conductive portion 3 may also be: yarns, etc. The structure 3 shown in Fig. 1 is to be understood as a conductive structure in general, not so much as a single embodiment, With reference numeral 4, a coating layer, for example of plastics material, is indicated in Fig. 1.

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Reference numeral 5 denotes the brushes in Figure 1: • · t: f>; ' 35 parts adapted to attenuate the oscillation of the conductor 1 due to the eddies due to the crosswind.

In accordance with the essential idea of the invention, each brush part 5 is formed in a longitudinal direction of the conductor 1 as a variable part of the heel. The number of brush portions 5 may vary as required. Thus, the brush parts 5 may be one or more. The brush portions 5 may be formed as portions of the symmetry axis S of the conductor 1 as in the figures. However, there is nothing to prevent the brush portions 5 from being formed, for example, in the form of a spiral, if such an alternative is deemed necessary, etc.

The shape of the brush members 5 can be freely selected as required. The brush portions can be, for example, sinusoidal, angular, irregularly shaped, etc. The periodicity of the brush 15 portions can also be implemented in various ways. For example, the brush portion 5 may be continuous, with successive ridges immediately following each other. Such an embodiment is shown, for example, in Figures 1 and 2. The brush portion 5 may also be partial, with a flat region 5b between the successive ridges 5a. Such an embodiment is shown in Figure 3. The flat region 5b may form a shallow area slightly projecting from the surface of the conductor 1, as shown in Figure 3, etc.

. . ·, If there is more than one brush section 5 in the conductor, then • · <'.'V 25 can be interchanged between different brush sections. Such a solution is illustrated in Fig. 3. The crown sections 5 may be formed into either flexible or rigid sections.

t · i ** 'The shape of the cross sections of the brush sections 5 can be selected as ··· v: 30 as required. For example, the substantially triangular shape shown in Figure 1 may be mentioned as a preferred embodiment. The height of the brush sections can also vary, for example,. **: Depending on the conductor dimensions. In this connection, it can be noted that a brush part having a maximum height of 1/3 x the outer diameter of the wire • · ·: m / '35 achieves a favorable result. The brush parts 5 can be formed of the same material as the coating layer 4. However, this is not the only option since the brush parts 5 can also be formed of different materials. than the coating layer 4 or they may contain a different material 5 than the coating layer. By way of example, there may be mentioned a solution in which the brush members are formed of a coating layer material with, for example, reinforced plastic reinforcements which increase the tensile strength of the conductor and a solution in which the brush members are made of a material of higher strength

Optical fibers may also be added to the brush members 5 if such a solution is deemed necessary. The brush portions 5 can also be formed as parts of a separate surface layer, whereby the surface layer 15 is formed on top of the coating layer 4, of which the brush parts are parts. The topsheet may be either of the same material or of a different material as the topsheet 4. Preferably, the brush parts 5 are formed with the same tool as the topsheet 4.

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. Accordingly, it is clear that the conductor of the invention or its details may not necessarily:. joke to be exactly as shown in the figures, «·« «« no <(• te <· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·· 1 • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · to toen to: ·

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Claims (6)

105365 A conductor for an overhead conductor line, in particular a coated conductor (1), comprising at least one vibration-induced conductor (1) of a brush (1) extending over the conductor as a continuous structure extending over the conductor length, the brush part (5) is formed as a variable height section 10 of the conductor (1), which at each point is adapted to protrude from the surface of the conductor. Cable according to Claim 1, characterized in that the brush part (5) is formed as a continuous part, in which the higher and lower points immediately follow each other. A conductor according to claim 1, characterized in that the brush portion (5) is formed as a discontinuous portion in the longitudinal direction of the conductor (1), with a flat region (5b) between successive ridges (5a). A conductor according to any one of the preceding claims 1 to 3, characterized in that a phase shift is arranged between the different brush sections (5) of the conductor (1). 5. The method of any one of claims 1-4 «'" V 25 conductor, characterized in that the brush parts (5); 1 2 3V are parallel to the axis of symmetry (S) of the conductor. O · a \ A conductor according to any one of the preceding claims 1 to 5, characterized in that the brush parts (5) are formed as bendable parts. t · · • • · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · «« · 3 105365