JP2000067656A - Electric wire with low wind noise - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire with tow wind noise capable of controlling wind noise without requiring a spiral rod, while using the conventional shape and size of the electric wire. SOLUTION: A number of recesses 4 are provided in lines in the longitudinal direction of element wires on the surfaces of the element wires constituting the outermost layers of stranded wires 1 in such a manner that the recesses 4 in the adjacent element wires are located on an alternate basis and their outer diameter corresponds to that of the stranded wires 1 with no recess. The recesses 4 are preferably made in a circular or polygonal shape with their depth being 10% or less the diameter or height of the element wires. The shape of the element wires in which the recesses 4 are formed may be sectionally round as usual, more preferably formed on the outer surface of a deformed line almost in a sectional sector form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of overhead power transmission lines, and more particularly to the provision of electric wires with low wind noise measures.

[0002]

2. Description of the Related Art An overhead power transmission line generally uses a steel core aluminum stranded wire, and an aluminum stranded layer is formed by twisting round aluminum wires having a round cross section as shown in FIG. 3 or traversing as shown in FIG. It is twisted with an almost fan-shaped irregular wire.

[0003] By the way, such overhead transmission lines generate electric wire wind noise due to wind. As a countermeasure, there is a method of winding a spiral rod on the electric wire without changing the shape of the electric wire, and providing a projection on a part of the outermost layer stranded wire of the stranded wire constituting the electric wire as shown in FIG. There was a way to suppress the generation of sound.

[0004] With the recent increase in the length of transmission lines and ultrahigh pressure, the size of electric wires used has been increasing, and the number of conductors has been increasing, and the problem of wind noise caused by wind has become even more noticeable and important. ing.

[0005]

As described above, the outer layer wires of the existing line have a round cross section; FIG.
As shown in FIG. 4, a spiral rod is wound as a countermeasure for wind noise.

When the wind noise of the electric wire is predicted in advance, a low wind noise type electric wire is used, and the wire is wired using FIG. 5, but this low wind noise type electric wire is also more expensive than a normal electric wire. Becomes In addition, since a special projection is formed in the shape of the electric wire, a dedicated tool is required for the overhead wire tool and accessories, and this portion is also expensive and complicated in management.

Therefore, the problems to be solved by the present invention (objects)
Uses the shape and dimensions of the conventionally used wires,
An object of the present invention is to provide a low wind noise electric wire that can suppress wind noise of the electric wire without requiring a spiral rod.

[0008]

According to the low wind noise electric wire provided by the present invention, a large number of depressions are provided in a row in the longitudinal direction of the strands on the surface of the strand constituting the outermost layer of the stranded wire, and adjacent strands are formed. The dents of the wires are staggered so that the outer diameter of the stranded wire is the same as that of a similar stranded wire that does not have the dents. It is to be a dimension.

[0009] The above-mentioned depression has a wire diameter or height of 10 mm.
% Or less, and it is good to be drilled in a circular or polygonal shape. The shape of the element wire to be recessed may be an ordinary round cross section, but it is particularly preferable to form the wire on the outer surface of an irregular wire having a substantially fan-shaped cross section.

[0010]

FIG. 1 shows a preferred embodiment of a low wind noise electric wire according to the present invention. FIG. 2 shows a cross-sectional shape of an outer layer wire of the electric wire.

The low wind noise electric wire of this embodiment is composed of two layers of an irregularly shaped aluminum wire 2 having a substantially fan-shaped cross section on the outer periphery of a steel stranded wire 1 formed by twisting round aluminum-coated steel wires having a cross section. And an aluminum twisted layer 3 is formed. This steel core aluminum stranded wire has the same outer diameter as the conventional steel core aluminum stranded wire using an irregular shaped aluminum wire (FIG. 4).

The outer surface of the modified aluminum wire 2 constituting the outer layer of the aluminum twisted layer 3 in the steel core aluminum stranded wire has a circular recess 4 of 10% or less of the height of the modified aluminum wire 2.
Are arranged in rows in the longitudinal direction, and twisted such that the depressions 4 are alternately located between the adjacent shaped aluminum wires 2 to make the wire surface non-uniform, thereby reducing wind noise from the wires. It is to be deterred.

The shape of the depression is not limited to a circle but may be a polygon. Further, in the above-described embodiment, a modified aluminum wire is employed, but a round aluminum wire may be used. In this case, the depression is 10% of the outer diameter of the round aluminum wire.
The following is assumed.

[0014]

According to the low wind noise electric wire according to the present invention as described above, a large number of dents formed on the surface of the outer layer wire make the dents alternate between adjacent wires, thereby reducing the wind. Sound can be suppressed.

[0015] The low wind noise electric wire as described above has the same outer diameter as that of a conventional wire having no irregularities, and does not form a large projection unlike the conventional wire. The accessories can be used as they are, and no special tools or accessories are required due to the low wind noise structure. Therefore, there is a great effect in terms of reduction of transmission line construction cost, improvement of workability, and workability.

As described above, according to the present invention, a low wind noise electric wire which can suppress wind noise of the electric wire without using a spiral rod by using the shape and size of the electric wire conventionally used. Challenge (Purpose) of Providing
Can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective explanatory view showing an embodiment of a low wind noise electric wire according to the present invention.

FIG. 2 is an explanatory cross-sectional view of a strand in the low wind noise electric wire shown in FIG. 1;

FIG. 3 is an explanatory cross-sectional view showing a conventional example of an electric wire having a round cross-section element wire as an outer layer.

FIG. 4 is a cross-sectional explanatory view showing a conventional example of an electric wire whose outer layer is made of a cross-section irregularly shaped element wire.

FIG. 5 is a cross-sectional explanatory view showing a conventional example of a low wind noise type electric wire having a projection on an outer layer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel stranded wire 2 Deformed aluminum wire 3 Aluminum stranded layer 4 Depression

Claims (3)

[Claims] 1. A plurality of depressions are provided in a row in a longitudinal direction of a strand on a surface of a strand constituting an outermost layer of a stranded wire, so that depressions of adjacent strands are alternately positioned. A low wind noise electric wire made by matching the outer diameter with the same stranded wire. 2. The method according to claim 1, wherein the depression has a wire diameter or a height of 10 mm.
Perforated in a circle or polygon with a depth of less than
The low wind noise electric wire according to claim 1. 3. The low wind noise electric wire according to claim 1, wherein the depression is formed on an outer surface of a profile wire having a substantially fan-shaped cross section.