JPH08148038A - Cable conductor - Google Patents

Abstract

PURPOSE: To provide a cable conductor having flexibility even in a counductor size of large capacity and a high conductor space factor further to generate no deformation even in the case of being subjected to a lateral pressure in a receiving machine in manufacturing a staranded conductor. CONSTITUTION: A prescribed number of conductor element wires 3 are twisted together, to constitute a collective stranded conductor 2, and by twisting together a prescribed number of these collective stranded conductors 2, a conductor segment 1 is constituted. In this condctor segment 1, its section is compression- molded into a fan shape, and this conductor segment 1 is formed to be constituted into a circular section by twisting together the segment 1 in a condition that a vertex of a plurality of its fan shapes is arranged in the center. As a result, having flextibility with no softness lost, since the conductor segment is compression molded, the conductor segment, having a high conductor space factor, is not deformed even in the case of being subjected to a lateral pressure in a receiving machine.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable conductor for a power cable, particularly a CV cable, and more particularly to a cable conductor for a flexible CV cable.

[0002]

2. Description of the Related Art The structure of a cable conductor of a power cable, particularly a CV cable, is generally formed by gathering concentric twisted wires as shown in FIG. In FIG. 2, reference numeral 21 denotes a conductor element wire, and several tens, for example, 50 pieces of this conductor element wire 21 are twisted together to form an aggregate twist conductor 22, and this aggregate twist conductor 22 is twisted concentrically from the center. The cable conductor B is formed by ply-twisting into a plurality of layers. If flexibility is required, the strand 2 in FIG.
2 can be used as an assembly stranded wire of the thin wire 21.

As described above, twisting the conductor wires together to form a cable conductor is an effective means for reducing the skin effect and for providing flexibility.

[Problems to be Solved by the Invention]

By the way, in recent years, skyscrapers have been actively built in Japan. Even in these high-rise buildings, as the number of skyscrapers increases, the power consumption in the buildings also increases, and the conductor size of the power cable is increasing in size. In this high-rise building, the mains power cable is required to have a large capacity, a small size, and flexibility so that it can be easily installed due to structural restrictions of the building.

The above-mentioned conventional concentric collective twisted cable conductor B has flexibility when the conductor size is increased in order to cope with a large capacity, but the radius of curvature increases, so that a corner portion is laid when laying in a building. There is a problem that the cost is increased because the number of connections is increased and the number of parts is increased. Further, if the conductor size is increased with the above configuration even during manufacturing, there is a problem that it is difficult to increase the capacity such that lateral force is applied by the take-up machine when the cable conductor B is twisted and deformed, which causes troubles when the insulating layer is covered.

The present invention solves the above problems by, for example, 10
Even if the conductor has a large capacity exceeding 00 mm ² , it has flexibility, has a high conductor space factor, and does not deform even when subjected to lateral pressure by a take-up machine during the production of a stranded wire. It is intended to provide a cable conductor.

[0007]

The present invention has the following means in order to achieve the above object.

In the cable conductor of the present invention, a predetermined number of conductor element wires are twisted together to form an aggregate twist conductor, and this aggregate twist conductor is twisted into a predetermined number to form a conductor segment. The cross-section is compression-molded into a fan shape, and a plurality of the conductor segments are twisted together in a state where the apex of the fan shape is arranged at the center, and are formed into a circular cross-section.

[0009]

According to the cable conductor of the present invention, since the conductor segment is composed of the conductor twisted conductor in which a predetermined number of conductor wires are twisted, and the conductor segment is formed by twisting a predetermined number of conductor wires, the flexibility is improved. It does not lose its flexibility. Further, since the conductor segments are compression-molded in a fan-shaped cross section, the gap between the conductor wires is reduced, the space factor of the conductor wires is increased, and the conductor size can be reduced. Furthermore, since the conductor segments are compression-molded in a fan-shaped cross section, the cable conductor formed by twisting the conductor segments into a circular cross section does not deform even when lateral pressure is applied by a take-up machine. It is possible to solve problems such as troubles when covering the insulating layer.

[0010]

The present invention will be described below in detail with reference to examples. FIG. 1 is a cable conductor A of the present invention. The cable conductor A is formed by twisting a plurality of conductor segments 1. The conductor segment 1 is formed by twisting a predetermined number of aggregate twist conductors 2. The twisted conductor conductor 2 is formed by twisting a predetermined number of conductor wires 3.

In the present embodiment, the conductor wire 3 has a wire diameter of 0.45 mm, and 51 conductor wires 3 are twisted together to form the aggregate twisted conductor 2. The conductor segment 1 is formed by twisting 25 of the aggregate twist conductors 2. (FIG. 1 is a schematic view and a part of it is omitted. The number of the twisted conductor conductors 2 does not match that of this embodiment.)
The conductor segment 1 in which the 25 twisted conductor conductors 3 are twisted together is compression-molded into a fan-shaped cross section.

In the cable conductor A, the conductor segment 1 which is compression-molded into a fan shape has 5 segments in this embodiment,
The fan-shaped vertices are arranged in the center and twisted together to form a circular cross section. That is, the cable conductor A of this example is 0.45 mmφ × 51 pieces × 25 pieces × 5 segments, and its cross-sectional area is about 1000 mm ² . The outer diameter of the cable conductor A at this time is 39 mmφ. When a lateral pressure of 2000 kg / 2 m is applied to the side surface of the cable conductor A in the longitudinal direction of the conductor, the outer diameter deformation is such that the maximum outer diameter is 39.5 mmφ and the minimum outer diameter is 38.0 mm.
It deformed to φ and the difference between the maximum outer diameter and the minimum outer diameter was 1.5 mm.

For comparison, the outer diameter deformation of the conventional concentric set twisted cable conductor B was examined. In the cable conductor B of the comparative example, the conductor wire 21 having an outer diameter of 0.45 mmφ is 50
The twisted conductors 22 are configured by main twisting, and 127 twisted conductors 22 are concentrically twisted in 6 layers. One center conductor, one layer 6, two layers 1
2, 3, 18 layers, 4 layers, 24 layers, 5 layers, 30 layers, 6 layers, 36 layers
It is a book, and its cross-sectional area is about 1000 mm ² . The outer diameter of the cable conductor B is 43.8 mmφ, which is 4.8 mm larger than the cable conductor A of the above-described embodiment of the present invention. In this cable conductor B, 2000 kg / s on the side surface in the conductor longitudinal direction as in the above embodiment.
When a lateral pressure of 2 m is applied, the outer diameter deformation is 4
The minimum was 4.6 mmφ and was deformed to 41.5 mmφ, and the difference between the maximum outer diameter and the minimum outer diameter was 3.1 mm, which was about twice the amount of deformation as that of the above example.

Next, the cable conductor A of the present invention is supplied with 600V.
A comparative example of the bending radius when the CV cable of No. 1 is used and the bending radius when the conventional cable conductor B is changed to the CV cable of 600V is shown. In addition, each of the above 600V CV
The cable is constructed by coating the outer circumferences of the cable conductors A and B with a cross-linked polyethylene layer as an insulating layer of 3.5 mm and a polyvinyl chloride layer as a protective sheath of 2.6 mm. Bending radius of CV cable using the cable conductor A of the present invention: 600 mm. C using the conventional concentric set twisted cable conductor B
Bending radius of V cable: 600 mm. As described above, the cable conductor A of the present invention has a bending radius similar to that of the conventional concentric collective twisted cable conductor B, its outer diameter is small, and lateral pressure is applied to the side surface in the conductor longitudinal direction. Even when added, the outer diameter deformation is smaller than that of the conventional concentric collective twisted cable conductor B.

[0015]

As described above, according to the cable conductor of the present invention, a conductor segment is composed of an aggregate stranded conductor in which a predetermined number of conductor element wires are twisted together, and a predetermined number of the conductor segments are twisted together. Since it is configured, it has flexibility without losing flexibility, so even when laying inside a building, it can be bent and installed without increasing the number of connections at the corners, so the number of parts is small and the cost is low. Down is possible. Further, since the conductor segments are compression-molded in a fan-shaped cross section, the gap between the conductor wires becomes small, the space factor of the conductor wires becomes large, and the conductor size becomes small. Furthermore, since the conductor segments are compression-molded in a fan-shaped cross section, the cable conductor formed by twisting the conductor segments into a circular cross section does not deform even when lateral pressure is applied by a take-up machine. It is possible to solve problems such as troubles when covering the insulating layer.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a cable conductor of the present invention.

FIG. 2 is a cross-sectional view showing an example of a conventional cable conductor.

[Explanation of symbols]

 1 conductor segment 2 aggregate twist conductor 3 conductor wire A cable conductor

Claims (1)

[Claims] 1. A set of conductor strands are twisted together to form an aggregate twist conductor, and a set of strand conductors are twisted together to form a conductor segment, and the conductor segment is compressed into a fan-shaped cross section. A cable conductor, which is formed, and is formed by twisting a plurality of the conductor segments with the apexes of the fan shape arranged at the center, and having a circular cross section.