JPS59221905A - Wire - 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 Field of the Invention This invention relates to electric wires used for overhead power transmission, and more particularly to electric wires that effectively prevent wind noise.

Description of the Prior Art Providing projections on the surface of the wire has been proposed as an effective method for reducing wind B noise of overhead power transmission wires. In order to form this protrusion, 1 to 2
The work of winding the book's armor rod onto the electric wire is carried out. In this case, if protrusions are to be provided over a long section, a very large number of armor rods will be required.

Further, winding the armor rod after the overhead wire is very troublesome, and this results in an increase in construction costs.

Purpose of the Invention The present invention was made in view of the above-mentioned situation, and its main purpose is to provide an electric wire having protrusions formed on its surface without requiring any winding work and at a low cost. It is to be.

This invention is an electric wire in which at least one of the strands forming the outermost layer of the electric wire is made of an irreversibly deformable material. When kept at a high temperature, the shape deforms so that it protrudes from the outer peripheral surface of the wire, and once the shape is deformed, the shape does not return to its original shape.

DESCRIPTION OF EMBODIMENTS FIG. 1 is a sectional view showing an embodiment of an electric wire according to the present invention. The illustrated electric wire 1i11 has a core portion made of steel wire 2 and an outer layer portion around it made of aluminum wire 3. At least one of the threads constituting the outermost layer of the electric wire 1, two strands 4 in this embodiment, is made of an irreversibly deformable material.

In this embodiment, a shape memory alloy is used as the irreversibly deformable material. The wire 4 made of this shape memory alloy is subjected to shape memory treatment so that it protrudes from the outer circumferential surface of the electric wire 1 when kept at a high temperature of a predetermined value or higher. The wire 4 made of this shape memory alloy has irreversibility in that, after being deformed into a dish shape, the shape does not return to its original shape.

What is shown in FIG. 1 is a cross-sectional view of the electric wire when it is being stretched.

FIG. 2 is a cross-sectional view of the electric wire shown in FIG. 1 after it is connected to the overhead wire. As shown in the figure, when extending the electric wire 1,
What about the wire 4 made of shape memory alloy? [It does not protrude from the outer peripheral surface of 1. When the strand 4 is maintained at a high temperature above a predetermined value by temporarily passing an overcurrent, the strand 4 deforms in shape so as to protrude from the outer peripheral surface of the electric wire 1, as shown in FIG. In this way, the electric wire 1 has protrusions for reducing wind noise.

Irreversible deformation materials are not limited to shape memory alloys. That is, any metal or organic material that can achieve the operation described above may be used.

3 and 4 are cross-sectional views showing a Ti wire using irradiated polyethylene as the irreversibly deformable material.

Fig. 3 shows the electric wire during extension, and Fig. 4 shows the electric wire after overhead wiring. Also in this embodiment, when extending the electric wire,
The strand 5 made of irradiated polyethylene does not protrude from the outer peripheral surface of the electric wire 1. And the electric wire rack Pil! Later, when the strand 5 made of irradiated polyethylene is maintained at a high temperature above a predetermined value by temporarily passing an overcurrent, the strand 5 is removed from the outer peripheral surface of the electrode as shown in FIG. It changes shape to protrude. This strand 5 does not return to its original shape after being deformed into a dish shape.

The reason why the irreversibly deformable material was prevented from protruding from the outer circumferential surface of the wire when the wire was being extended was because if there were any protrusions on the surface, it would be impossible to carry out construction using conventional tools. be.

In each of the examples described above, two of the strands making up the outermost layer of the wire were made from irreversibly deformable material. However, at least one such strand is sufficient, and in order to effectively reduce wind noise, one to four such strands are required.
Preferably, the book strands are made from irreversibly deformable material.

Effects of the InventionSong As described above, according to the present invention, at least one of the threads constituting the outermost layer is made from an irreversibly deformable material, so that the catenary wire as conventionally latter 3
To make it possible to form protrusions on electric wires to achieve low noise without requiring any attachment work and at a low cost.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing one embodiment of the electric wire according to the present invention, with Figure 1 showing the electric wire during wire extension, and Figure 2 showing the wire on rack #1! ; Shows the wire after i. FIG. 3 J3 and FIG. 4 are cross-sectional views showing other embodiments of the electric wire according to the present invention, with FIG. 3 showing the electric wire during extension, and FIG. 4 showing the electric wire after overhead wiring. In the figure, 1 is an electric wire, 4 is a wire made of a shape memory alloy, and 5 is a wire made of irradiated polyethylene. Figure 1 Figure 4

Claims (3)

[Claims] (1) The outermost layer of the electric wire (at least one of the strands to be erected is made of an irreversibly deformable material, and the irreversibly deformable material deforms the electric wire when it is kept at a high temperature above a predetermined value). An electric wire that deforms in shape so as to protrude from the outer peripheral surface of the wire, and once the shape is deformed, it does not return to its original shape. (2) the irreversibly deformable material is a shape memory alloy;
An electric wire according to claim 1. (3) The electric wire according to claim 1, wherein the irreversibly deformable material is irradiated polyethylene.