JPH0731941B2 - Overhead power line - Google Patents

Description

TECHNICAL FIELD The present invention relates to the structure of an electric wire used as an overhead power transmission line.

<Prior Art and Its Problems> Currently, for example, a copper-core aluminum stranded wire (ACSR) having a structure as shown in FIG. 2 is widely used as an overhead power transmission line. In FIG. 2, the outer layer aluminum wire 11 covering the outer side of the galvanized copper wire 12 has a three-layer structure, but it is also known that the outer layer aluminum wire 11 has a four-layer structure. In addition to the above-mentioned ACSR, steel core heat-resistant aluminum alloy stranded wire, aluminum-coated steel core aluminum stranded wire, etc. are also used as overhead power transmission lines.However, instead of aluminum wire, heat-resistant aluminum alloy wire is used instead of aluminum wire. Aluminum coated steel wire is used instead of wire, and the basic structure is the same as ACSR shown in Fig. 2.

<Problems to be Solved by the Invention> In the conventional steel-core aluminum stranded wire B shown in FIG. 2, the aluminum wire 12 and the galvanized steel wire 11 which are greatly different in hardness are contacted with each other in opposite directions. Therefore, if a crushing force is applied to the wire due to the wire tension on the gold car during the overhead wire construction, the aluminum wire that is in contact with the galvanized steel wire will be softer and a large crushing (nicking) will occur in the aluminum wire. is there. If this nicking occurs excessively, the wires gather in the direction toward the center of the wire, and the outer diameter of the wire decreases, so that there is insufficient space for the outermost layer wire to keep a circular shape. There is a drawback that a book or a plurality of books stick out, and it is often a problem because it tends to occur in a large size which is often used in a trunk transmission line.

<Means for Solving Problems> The present inventors have achieved the present invention as a result of intensive studies to obtain an overhead power transmission line that solves the above problems.

That is, according to the present invention, in an overhead power transmission line composed of three or more kinds of different material strands, when the strands are twisted, the strands having higher hardness are arranged in order from the center to the outside. It is a characteristic overhead power transmission line.

<Embodiment> The present invention will be described with reference to FIG. 1 showing an embodiment thereof. The overhead transmission wire of the present invention has a hardness between a steel wire 1 having a high hardness and an aluminum wire 3 softer than the steel wire 1. However, by arranging the element wire 2 which is about the middle of the two, the crushing of the outermost aluminum wire 3 due to the crushing force during the overhead wire construction is significantly reduced.

This is because by providing the element wire 2 having a hardness intermediate between the steel wire 1 and the aluminum wire 3, the difference in hardness of the element wires of the layers in contact with each other becomes small, and as a result, a crushing force is applied to the electric wire. Even if it does, the crushing of the aluminum wire can be reduced. Thus, it is possible to prevent the deformation of the electric wire during the overhead wire construction of the electric wire.

Therefore, using the overhead power transmission line of the present invention,
High tension wire drawing is possible.

In obtaining the overhead power transmission line of the present invention, a galvanized steel wire, an aluminum-coated steel wire or the like is used as the steel wire 1, and as the element wire 2 having a hardness about intermediate between the steel wire 1 and the aluminum wire 3. High-strength aluminum alloy wire, high-strength heat-resistant aluminum alloy wire, aluminum alloy wire of No. A, hard copper wire, etc. can be used. As the aluminum wire 3, a heat resistant aluminum alloy wire or a hard aluminum wire may be used.

<Effect> As described above, according to the present invention, the crushing of the aluminum wire is reduced by selecting the wires so as to reduce the difference in hardness between the adjacent wires and forming a stranded wire having three or more layers. However, this has the effect of preventing deformation when used as an electric wire.

Further, due to the above-mentioned effects, it is possible to perform long-distance drawing with a long distance between the drum field and the engine field or high-tensile wire drawing with high wire tension in the wire drawing work.

These long-distance wires and high-tensile wires have the advantages that the number of drum fields and engine fields can be reduced and the number of protective scaffolds can be reduced, which greatly contributes to the reduction of overhead cable construction costs. Of.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the structure of a steel-core aluminum stranded wire used as an overhead transmission line in the present invention, and FIG. 2 is a cross-sectional view of a conventional steel-core aluminum stranded wire. 1 ... Steel wire, 2 ... Intermediate wire 3 ... Aluminum wire

Claims (1)

[Claims] 1. In an overhead power transmission line composed of three or more kinds of wires made of different materials, when the wires are twisted, the wires having a high hardness are arranged in order from the center to the outside. A characteristic overhead power line.