JPH0541112A - Low windy sound type stranded wire conductor - Google Patents

Abstract

PURPOSE:To prevent extruded strips from being crushed and improve windy sound preventive effect by inserting copper wires into the strips extruded toward the external circumference. CONSTITUTION:Regarding a stranded wire conductor for overhead power transmission line, some of strands in the outmost layer forming extruded strips 4 is composed of aluminum-coated copper wires 9 where copper wires 8 are introduced even into some of the extruded strips 4 and other strands in the same layer are composed of aluminum wires 3b. Consequently, even if high pressure is applied to the extruded strips when the stranded wire conductor passes a metal vehicle in overhead laying work, the extruded strips are prevented from being crushed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low wind noise type twisted conductor used as an overhead power transmission line or an overhead ground line.

[0002]

2. Description of the Related Art When wind blows laterally on an overhead power transmission line or an overhead ground line, wind noise is generated, which may cause noise pollution. In order to prevent this wind noise, it is known that a spiral ridge should be formed on the outer peripheral surface of the overhead power transmission line or the overhead ground wire. In this method, the spiral ridges disturb the air flow, suppress the generation of Karman vortices, and suppress wind noise. Based on such an idea, conventionally, a stranded conductor as shown in FIG. 3 or 4 has been proposed.

FIG. 3 shows a stranded conductor for an overhead power transmission line, which has a stranded wire of galvanized steel wire (aluminum-coated steel wire is also acceptable) 1 in the center, and an aluminum wire (aluminum alloy wire) having a circular cross section on the outer periphery thereof. 2) are twisted together, and a segment type aluminum wire (aluminum alloy wire is also possible) 3 is twisted around the outer circumference, but some aluminum wires 3a of the outermost layer are other aluminum wires of the same layer. 3b, the size in the diametrical direction of the stranded conductor is made larger than that of 3b, and the spiral protrusion 4 is formed on the outer peripheral surface.

FIG. 4 shows a stranded conductor used as an overhead ground wire containing an optical fiber, which has a pipe 5 for accommodating the optical fiber at the center and two layers of segment-shaped aluminum-coated steel wires 6 and 7 on the outer periphery thereof. The aluminum-coated steel wire 7a that is a part of the outermost layer is
The ridge 4 is formed in a spiral shape on the outer peripheral surface by increasing the size in the diameter direction of the stranded wire conductor from b.

[0005]

In the conventional low wind noise type twisted wire conductor as described above, since the spiral projection on the outer peripheral surface is made of aluminum or aluminum alloy, it passes through the gold wheel during the erection work. However, there is a problem in that the ridges are crushed when doing so, and the effect of preventing wind noise after installation is reduced.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a low wind noise type twisted conductor in which the above-mentioned problems are solved. In a low wind noise type twisted wire conductor in which the size in the diameter direction of the twisted wire conductor is made larger than that of other wires to form a spiral projection on the outer peripheral surface, It is characterized in that it is composed of an aluminum-coated steel wire or a galvanized steel wire containing steel wires.

[0007]

With this structure, the steel wire with high strength is present in the spiral ridge, so that the ridge will not be crushed even if a large pressure is applied when passing through the metal wheel. ..

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. This stranded wire conductor is for overhead power transmission lines, and its feature is that
Part of the outermost layer forming the ridge 4 is composed of an aluminum-coated steel wire (a galvanized steel wire is also possible) 9 having a steel wire 8 extending to the ridge 4. This means that the other element wires are made of the same aluminum wire 3b as the conventional one. The internal structure is shown in Figure 3.
This is the same as the conventional stranded conductor shown in. The tensile strength of the aluminum-coated steel wire 9 is preferably 40 kgf / mm ² or more.

FIG. 2 shows another embodiment of the present invention. This stranded wire conductor is for overhead ground wire, and the feature is that
Part of the outermost layer forming the ridge 4 is composed of an aluminum-coated steel wire (a galvanized steel wire is also possible) 9 having a steel wire 8 extending to the ridge 4. This means that the other wires are made of the same aluminum-coated steel wire 7b as the conventional one. The internal structure is the same as that of the conventional stranded wire conductor shown in FIG.

[0010]

As described above, since the low wind noise type stranded wire conductor according to the present invention has a structure in which the steel wire is contained in the ridge protruding to the outer peripheral surface, the wagon is not installed during the construction work. Even if a large pressure is applied to the ridge when passing, the ridge is not crushed, and there is an advantage that the wind noise prevention effect can be surely exhibited after installation.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a low wind noise type stranded wire conductor according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the low wind noise type twisted wire conductor according to the present invention.

FIG. 3 is a sectional view showing an example of a conventional low wind noise type stranded wire conductor.

FIG. 4 is a sectional view showing another example of a conventional low wind noise type stranded wire conductor.

[Explanation of symbols]

1: Galvanized steel wire 2: Aluminum wire 3b: Aluminum wire (other wire of the outermost layer) 4: Ridges 5: Pipe 6: Aluminum-coated steel wire 7b: Aluminum-coated steel wire (other wire of the outermost layer) ) 8: Steel wire 9: Aluminum coated steel wire (partial wire of the outermost layer)

Claims (1)

[Claims] 1. A low wind noise type in which a part of the strands of the outermost layer is made larger in size in the diametrical direction of the stranded conductor than the other strands of the same layer, and spiral ridges are formed on the outer peripheral surface. A low wind noise type twisted wire conductor, wherein the part of the strands is composed of an aluminum-coated steel wire or a galvanized steel wire in which a steel wire is even extended to the protruding portion.