JP3428708B2 - Overhead wire - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stranded electric wire used as an overhead power transmission line or an overhead ground wire.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional overhead wire. This overhead wire is made by twisting the aluminum-coated steel wire 1 in the center,
An aluminum element wire 2 having a fan-shaped cross section is twisted on it, and an aluminum element wire 3 having a circular cross section is twisted on it.
An aluminum alloy wire may be used instead of the aluminum element wires 2 and 3. Thus, in the conventional overhead wire, except for the aluminum-coated steel wire 1 as the central tension member, the wires made of the same material are twisted in each layer.

[0003]

The characteristics such as conductivity, heat resistance, tensile strength, and elongation required for the overhead wire differ depending on the use conditions, the erection conditions, and the like. However, conventionally, since the same wire is used for the same layer, the characteristics of the overhead wire depend on the material, and it is difficult to construct an overhead wire that meets all the required characteristics.

[0004]

The present invention SUMMARY OF] is intended to provide a overhead conductors which solves the above problems, its basic configuration is the outermost layer, to match the required characteristics of the overhead conductors The feature is that the wires made of different materials are combined and twisted together.

[0005]

By doing so, it is possible to construct an aerial wire that meets the required characteristics by combining the wires of different materials. In the overhead wire of the present invention, if different colors are applied to the wires made of different materials and the same color is applied to the wires made of the same material, the materials can be identified by the colors. In addition, if each of the strands of the layer in which the strands of different materials are twisted together is provided with an insulating coating, it is possible to prevent electrolytic corrosion from occurring between the strands of different materials.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 4 each show an embodiment of the present invention. In each of the examples, the same point is provided that the aluminum-coated steel wire 1 is twisted at the center, and a fan-shaped aluminum element wire (or an aluminum alloy element wire) 2 is twisted on the tension member. .

In the overhead wire of FIG. 1, a hard aluminum element wire 3 having a circular cross section, a soft aluminum element wire 4, an aluminum alloy wire element No. 5 and a heat resistant aluminum alloy element wire 6 are twisted together in the outermost layer. It is a thing. By doing so, the characteristics of the overhead wire are a combination of the characteristics of the four types of strands. In the drawing, four strands of the same material are arranged collectively, but the arrangement of the strands is not limited to this, and it is possible to dispose strands of different materials for each one, for example ( The same applies to the following examples).

In the overhead wire of FIG. 2, a hard aluminum element wire 3 having a circular cross section, a soft aluminum element wire 4, an aluminum alloy wire element No. 5a, and a heat resistant aluminum alloy element wire 6 are twisted together in the outermost layer. Wires made of different materials are given different colors, and wires made of the same material are given the same color. For example, the red paint 7 is applied to the hard aluminum wire 3 and the yellow paint 8 is applied to the soft aluminum wire 4.
No. B aluminum alloy wire 5 is coated with green paint 9 and heat resistant aluminum alloy wire 6 is coated with blue paint 10. The appearance of aluminum wires and aluminum alloy wires is almost the same, so they are indistinguishable. By applying the color as described above, there is no risk of making a mistake in the material at the time of manufacturing or overhead wire. The color may be linear or 1 /
It may be about three rounds, half rounds, or all rounds. In short, it is sufficient if it can be identified from the outside.

The overhead electric wire shown in FIG. 3 is made of a synthetic resin for a hard aluminum wire 3, a soft aluminum wire 4, an aluminum alloy wire 5 a, and a heat resistant aluminum alloy wire 6 which are twisted in the outermost layer. Insulation coating 11 is applied. Although there is a possibility that electrolytic corrosion will occur when the elemental wires made of different materials are arranged in contact with each other, the electrolytic coating can be prevented by providing the insulating coating 11 as described above. The insulating coating 11 can be provided by extrusion coating or painting.

In the overhead wire of FIG. 4, wires 3 to 6 which are twisted in the outermost layer are provided with an insulating coating 11, respectively. On the surface of the wires, different wires are made of different colors, and wires made of the same material are made of the same color. It is colored so that For example, the red coating 7 is applied to the insulating coating 11 of the hard aluminum wire 3, the yellow coating 8 is applied to the insulating coating 11 of the soft aluminum wire 4, and the green coating 9 is applied to the insulating coating 11 of the aluminum alloy wire 5 of No. The blue coating 10 is applied to the insulating coating 11 of the heat-resistant aluminum alloy wire 6. This coloring is also for identifying the material of the wire as in the embodiment of FIG. The insulating coating 11 itself may be colored instead of painting the surface of the insulating coating 11.

[0011] In the above embodiment describes the case where the different materials of the wires in the outermost layer, the present invention is not limited thereto, and all layers except the tension members of the centered For example The material of the wire may be different. Further, the present invention can be similarly applied to an overhead wire having no tension member at the center. Furthermore, the present invention is not limited to an overhead wire in which strands of aluminum or aluminum alloy are twisted together,
The same can be applied to an overhead wire in which strands of copper or copper alloy are twisted together.

[0012]

According to the present invention as described above, according to the present invention, the outermost
By twisted different strands of material in the outer layer,
Since it is possible to freely select and combine the characteristics such as conductivity, heat resistance, tensile strength, and elongation of each wire,
It has the advantage that it can widely meet the required characteristics of overhead cables.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an overhead wire according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a sectional view showing still another embodiment of the present invention.

FIG. 5 is a sectional view showing a general example of a conventional overhead wire.

[Explanation of symbols]

1: Aluminum coated steel wire 2: Aluminum element wire with a fan-shaped cross section 3: Hard aluminum wire 4: Soft aluminum wire 5: Aluminum alloy wire No. A 6: Heat resistant aluminum alloy wire 7: Red paint 8: Yellow paint 9: Green paint 10: Blue paint 11: Insulation coating

Claims (5)

(57) [Claims] 1. A in the outermost layer, overhead conductors, characterized in that twisted by combining different strands of material to meet the required characteristics of the overhead conductors. Wherein the outermost layer, overhead conductors, characterized in that twisted by combining different strands of a material consisting of aluminum or aluminum alloy to meet the required characteristics of the overhead conductors. 3. The overhead wire according to claim 1 or 2, wherein each strand of a layer in which strands of different materials are twisted, different strands of different materials, and strands of the same material are used. It is characterized by having the same color applied. 4. The overhead wire according to claim 1, wherein each of the strands of the layer formed by twisting the strands of different materials is provided with an insulating coating. 5. The overhead wire according to claim 4, wherein the insulation coating or the surface thereof is colored so that the wires made of different materials have different colors and the wires made of the same material have the same color. Characterized by