JPS6310407A - Aerial transmission line - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application 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, as an overhead power transmission line, a steel-core aluminum stranded wire (AC8R) having a structure as shown in FIG. 2, for example, is widely used. Figure 2 shows the outer layer of aluminum covering the outside of the galvanized steel wire 12! D
Although No. 11 shows a 3-layer v43m structure, a structure with a 4-layer outer layer aluminum wire is also known. In addition, the above A
In addition to C8R, steel-core heat-resistant aluminum alloy stranded wires, aluminum-coated steel-core aluminum stranded wires, etc. are also used for overhead power transmission lines, but these use heat-resistant aluminum alloy wire instead of aluminum wire and instead of galvanized A-wire. The basic structure is the same as AC8R shown in FIG. 2, using aluminum-coated WA wire.

<Problems to be Solved by the Invention> In the conventional steel core aluminum stranded wire B shown in FIG. Therefore, if crushing force is applied to the wire due to the wire tension on the metal car during overhead line construction, the aluminum wire that is in contact with the galvanized W2B is softer, so the aluminum wire will be severely dipped or twitched. be. When this Niraking occurs excessively, the wires gather toward the center of the wire, the outer diameter of the wire decreases, and as a result, there is insufficient space for the outermost layer wires to maintain their circular shape, and the wires become 1 It has the disadvantage that one or more lines protrude, and it often becomes a problem because it tends to occur particularly in large-sized lines that are frequently used in trunk power transmission lines.

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

That is, the present invention provides an overhead power transmission line in which the wires are made of three or more different materials, and when the wires are twisted, the wires are arranged in descending order of hardness from the center to the outside. This is a distinctive feature of overhead power transmission lines.

<Example> This invention will be explained based on FIG. 1 showing an example thereof. The overhead transmission line of this invention is made of tai and Hf! which have high hardness.
By providing a structure in which a strand 2 whose hardness is intermediate between the aluminum 113, which is softer than 481, is provided, crushing of the outermost aluminum wire 3 due to crushing force during overhead line construction is attempted to be significantly reduced. It is something.

This is because by providing the wire 2 having a hardness intermediate between the steel wire 1 and the aluminum wire 3, the difference in hardness between the wires in the contacting layers becomes smaller, and as a result, crushing force is applied to the wire. Even if the aluminum wire is damaged, the collapse of the aluminum wire can be reduced. This makes it possible to prevent deformation of the wire during overhead wiring work.

Therefore, when using the overhead power transmission line of this invention, long-distance line extension,
This enables high-tension wire drawing.

In obtaining the overhead power transmission line of this invention, a galvanized steel wire, an aluminum coated wire, etc. are used as the steel wire 1, and
As the wire 2 having a hardness between the wire 1 and the aluminum wire 3, high-strength aluminum alloy wire, high-strength heat-resistant aluminum alloy wire, No. 1 aluminum alloy gravel, hard steel wire, etc. can be used. As the aluminum wire 3, a heat-resistant aluminum alloy wire or a hard aluminum wire may be used.

Effects> As explained above, this invention reduces the crushing of aluminum wires by selecting wires to reduce the difference in hardness between adjacent wires and stranding them in three or more layers. However, this has the effect of preventing deformation when used as an electric wire.

In addition, the above-mentioned effects enable long-distance wire extension in which the distance between the drum station and the engine station is increased, and high-tension wire extension in which the wire is extended with high wire tension, in wire extension work.

These long-distance wire extensions and high-tension wire extensions have the advantage of being able to reduce the number of drum stations and engine stations, as well as the number of protective scaffolding installations, which greatly contributes to reducing overhead line construction costs. be.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of the structure of a steel-core aluminum stranded wire used as an overhead power transmission line in the present invention, and FIG. 2 is a sectional view of a conventional Seishin aluminum stranded wire. 1... Steel wire 2... Intermediate strand 3...
Aluminum wire applicant's agent Patent attorney Kazu 1) Showa 1

Claims (1)

[Claims] An overhead transmission line consisting of wires made of three or more different materials, characterized in that when the wires are twisted, the wires are arranged in descending order of hardness from the center to the outside. Electrical wire.