JP2019186108A - Conductor, electric wire and cable - Google Patents

Abstract

To provide a conductor, electric wire and cable that can be easily bent and be easily wired even in a small space.SOLUTION: Provided is a conductor 1 comprising a parent twisted wire in which a plurality of child twisted wires 3, which are made by twisting a plurality of element wires 2, are further twisted, and in which the number in parent twist which is the number of child twisted wires 3 constituting the parent twisted wire is the number in child twist which is the number of element wires 2 constituting the child twisted wire 3, or more, and in which the twist direction of the child twisted wire 3 and the parent twisted wire are in the same direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to conductors, electric wires, and cables.

  Conventionally, IV (vinyl insulated wire for indoor wiring) or MLFC (flame retardant insulated wire, registered trademark) of about 14 to 80 SQ has been used as the main power transmission wire used for the switchboard for buildings and factory facilities. Yes.

  In order to perform wiring in a limited space, the wires used in the switchboard are bent with a small bending radius (for example, less than 4 times the cable self-diameter) inside the switchboard, or spirally wound with a small bending radius. There is a case where it is wired in a rotated state.

  In addition, there exists patent document 1 as prior art document information relevant to invention of this application.

JP 2010-129405 A

  In recent years, with the increase in the amount of power supplied to buildings and the increase in the amount of power supplied due to the enhancement of factory equipment functions, electric wires used for wiring in the switchboard are required to have higher allowable power (capable of flowing a large current). It has been. However, since such an electric wire (for example, an electric wire of 100 SQ or more) is thick and hard, it is difficult to bend with a small bending radius to form a small space wiring, and wiring work may be a heavy burden.

  Then, an object of this invention is to provide the conductor, electric wire, and cable which are easy to bend and can be wired easily also in a small space.

  For the purpose of solving the above-mentioned problems, the present invention is a conductor composed of a parent twisted wire in which a plurality of strands are twisted and a plurality of strands twisted together, and constitutes the parent twisted wire The number of parent strands that is the number of the twisted strands is equal to or greater than the number of strands that are the number of the strands constituting the strand, and the twist direction of the strand and the strand is Providing conductors that are in the same direction.

  Moreover, this invention provides the electric wire provided with the said conductor and the insulator provided in the outer periphery of the said conductor for the purpose of solving the said subject.

  Moreover, this invention provides the cable provided with the cable core which has one or more of the said conductors, and the jacket provided in the outer periphery of the said cable core in order to solve the said subject.

  According to the present invention, it is possible to provide a conductor, an electric wire, and a cable that can be easily bent and wired in a small space.

It is a figure which shows typically the cross section perpendicular | vertical to the longitudinal direction of the electric wire using the conductor which concerns on one embodiment of this invention. It is a figure which shows an example of the cable using the conductor which concerns on one embodiment of this invention, and is a figure which shows typically a cross section perpendicular | vertical to a longitudinal direction.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a diagram schematically showing a cross section perpendicular to the longitudinal direction of an electric wire using a conductor according to the present embodiment. As shown in FIG. 1, the electric wire 10 includes a conductor 1 and an insulator 4 provided on the outer periphery of the conductor 1. The electric wire 10 is used, for example, as a main power transmission electric wire (distribution board electric wire) used in a distribution board for factory equipment.

  As the insulator 4, it is preferable to use an insulating resin having heat resistance and flame resistance according to the application, for example, flame resistant XLPE (Cross-linked Polyethylene), heat resistant PVC (Polyvinyl Chloride), etc. Can be used.

  When the insulator 4 is cross-linked, examples of the cross-linking method include a method of cross-linking the insulator 4 by extrusion coating and then high-pressure and high-pressure cross-linking, an electron beam cross-linking to irradiate an electron beam, or a silane cross-linking. However, in the method in which the insulator 4 is subjected to extrusion coating and then crosslinked at a high temperature and pressure, the conductor 1 and the insulator 4 are in close contact with each other and the flexibility tends to deteriorate. Further, as will be described later, when lubricating oil (liquid paraffin or the like) is applied around the strand 2, it may be vaporized to generate bubbles between the strands 2, thereby deteriorating the insulation characteristics. . Therefore, when the insulator 4 is crosslinked, electron beam crosslinking or silane crosslinking is desirable.

  The conductor 1 according to the present embodiment is composed of a parent twisted wire in which a plurality of strands 3 obtained by twisting a plurality of strands 2 are further twisted. Hereinafter, the number of the child stranded wires 3 constituting the parent stranded wire (that is, the conductor 1) is referred to as a parent stranded wire, and the number of the strands 2 constituting the child stranded wire 3 is referred to as a child stranded wire.

  In the conductor 1 according to the present embodiment, the number of parent twists is equal to or greater than the number of child twists, and the twisting direction of the child twisted wire 3 and the parent twisted wire (conductor 1) is the same direction. This is because if the number of child strands is greater than the number of parent strands, the outer diameter of the child strand 3 becomes large (thick), and a large gap is easily formed between the strands 2 when the strand is twisted. Further, even when the twisting direction of the child stranded wire 3 and the parent stranded wire (conductor 1) is the reverse direction, a large gap is easily formed between the strands 2 when the strand is twisted.

  In addition, the twist direction of the strand wire 3 is the direction in which the strand 2 rotates in the circumferential direction of the strand strand 3 from the other end side to the one end side when the strand strand 3 is viewed from the one end side. Say. The twist direction of the parent stranded wire (conductor 1) is the direction in which the child stranded wire 3 rotates in the circumferential direction of the conductor 1 from the other end side to the one end side when the conductor 1 is viewed from one end side. Say. In FIG. 1, the twist direction of the child stranded wire 3 is represented by an arrow A, and the twist direction of the parent stranded wire (conductor 1) is represented by an arrow B.

  That is, the number of parent twists is equal to or greater than the number of child twists, and the twist direction of the child twisted wire 3 and the parent twisted wire (conductor 1) is the same direction, thereby making it difficult to create a useless gap between the strands 2; It becomes possible to arrange | position the strands 2 more closely. As a result, the number of strands 2 is equal to the number of strands 2 compared to the case where the number of strands is less than the number of strands and the twisting direction of the strands 3 and (conductor 1) is reversed. However, the outer diameter of the conductor 1 can be reduced, the outer diameter of the electric wire 10 can be reduced, and the electric wire 10 that is easy to bend (highly flexible) can be realized.

  Moreover, since the gap between the strands 2 is less likely to occur and the strands 2 are arranged in close contact with each other, the contact resistance (electrical resistance) between the strands 2 is reduced. It becomes possible. As a result, even when the number of the strands 2 constituting the conductor 1 is reduced as compared with the conventional example, a conductor resistance value equivalent to that of the conventional example can be realized. By reducing the number of the strands 2 constituting the conductor 1, the outer diameter of the conductor 1 can be further reduced, and the electric wire 10 that is easier to bend can be realized. Further, by reducing the number of the strands 2 constituting the conductor 1, the amount of copper to be used can be reduced, so that the cost can be reduced and the weight of the electric wire 10 can be reduced.

  Furthermore, by increasing the number of parent twists, the amount of the insulator 4 entering the gap around the conductor 1 is reduced, and the adhesion between the insulator 4 and the conductor 1 is weakened. As a result, the resistance force when the electric wire 10 is bent is reduced, and the electric wire 10 is more easily bent.

  In FIG. 1, for easy understanding of the structure of the electric wire 10, the twisted strands 3 are shown not to overlap each other, and are represented as if there is a large gap between the strands 2. Actually, there is almost no gap between the strands 2 due to other strands 3 entering the gap between the strands 3. That is, when the electric wire 10 according to the present embodiment is cut perpendicularly to the longitudinal direction, in the cross section, the inside of the insulator 4 is in a state where the wire 2 is almost completely filled with no gap.

  As the strand 2, TPC (Tough-Pitch Copper) or low proof annealed annealed copper wire can be used. When the annealed copper wire having a lower proof stress than TPC is used, the wire 2 is easily stretched, so that the electric wire 10 is more easily bent. In the present embodiment, the element wire 2 is made of HiFC (high functional pure copper, registered trademark) plated with tin, but the plating may be other metal plating (for example, silver plating). HiFC is a dilute copper alloy described in Japanese Patent Application Laid-Open No. 2010-265511, and pure copper containing inevitable impurities is mixed with 2 to 12 mass ppm of sulfur, 3 to 30 mass ppm of oxygen, and Ti to 4 to 55 mass. Contains ppm.

  Further, in the present embodiment, as the strand 2, the strand 2 coated with lubricating oil is used. As the lubricating oil, liquid paraffin can be used. Thereby, even if the strands 2 are in close contact with each other, the wires 2 are easily slid, so the resistance when bending the wire 10 is reduced, and the wire 10 is more easily bent.

  The twist pitch of the parent twisted wire (conductor 1) is preferably larger than the twist pitch of the child twisted wire 3. This is because the gap between the strands 2 after twisting is large and the effect of reducing the outer diameter of the conductor 1 is small when the twisting pitch of the core stranded wire 3 and the parent stranded wire (conductor 1) is the same or less. Because it becomes. Also, if the twisted pitch of the core stranded wire 3 and the parent stranded wire (conductor 1) is the same or less, the strand 2 is unwound when the insulator 4 is removed, and terminal processing such as terminal attachment is difficult. It may become. By making the twist pitch of the parent twisted wire (conductor 1) larger than the twist pitch of the child twisted wire 3, the conductor 1 can be maintained in a certain state when the insulator 4 is removed. It becomes.

  Moreover, since it is necessary to make the twist pitch of the child twisted wire 3 small to some extent in order to make the child twisted wire 3 into a bundled state, the twist pitch of the parent twisted wire (conductor 1) is changed to the twist pitch of the child twisted wire 3. If it is made smaller, there is a risk that a load will be applied to the core stranded wire 3 and problems such as disconnection of the strand 2 will occur. Therefore, also from such a viewpoint, it is desirable that the twist pitch of the parent stranded wire (conductor 1) is larger than the twist pitch of the child stranded wire 3.

  More specifically, it is desirable that the twist pitch of the parent stranded wire (conductor 1) is 2 to 5 times the twist pitch of the child stranded wire 3. Moreover, it is desirable that the twist pitch of the child stranded wire 3 is 20 to 50 times the outer diameter of the child stranded wire 3.

  In addition, the twist pitch of the child strand wire 3 is a space | interval along the longitudinal direction of the child strand wire 3 of the point where arbitrary strands 2 become the same position in the circumferential direction of the child strand wire 3. In the present embodiment, the twist pitches of all the child stranded wires 3 are the same. Further, the twist pitch of the parent stranded wire (conductor 1) is an interval along the longitudinal direction of the conductor 1 at a point where the arbitrary child stranded wire 3 is located at the same position in the circumferential direction of the conductor 1.

  Here, in order to examine the effect of the present embodiment, 100 SQ Example 1-1 and Example 1-2, electric wire 10 and Conventional Example 1 were prepared. In each of Examples 1-1, 1-2, and Conventional Example 1, the outer diameter (element diameter) of the wire 2 to be used was 0.45 mm, and the thickness of the insulator 4 was 2 mm. Moreover, in Example 1-1, Example 1-2, and Conventional Example 1, the twist pitch of the parent twisted wire (conductor 1) was 260 mm, and the twist pitch of the child twisted wire 3 was 75 mm. The conductor resistance value of a 100 SQ wire standardized by the JIS standard is 0.193 Ω / km or less, and in Example 1-1 and Example 1-2, the number of parent twists and the child twist so as to satisfy this condition The number was selected.

  In Conventional Example 1, which is a 100 SQ electric wire that has been generally used in the past, the number of parent strands is 19 and the number of strands is 34, and the twisting direction of the subsidiary strand 3 and the parent strand (conductor 1) is reverse. Met. In this case, the number of strands 2 used was 646, and the outer diameter of the electric wire was about 18.5 mm. The conductor resistance value of the manufactured electric wire of Conventional Example 1 was 0.176 Ω / km.

  On the other hand, in the electric wire 10 of Example 1-1, the number of parent twists is 25, the number of child twists is 24, and the twist direction of the child twisted wire 3 and the parent twisted wire (conductor 1) is the same direction. . In this case, the number of strands 2 used was 600, and the outer diameter of the electric wire 10 was about 17.2 mm. The conductor resistance value of the produced electric wire 10 of Example 1-1 was 0.186 Ω / km, and it was confirmed that the standard was satisfied.

  Moreover, in the electric wire 10 of Example 1-2, the number of parent twists was 27, the number of child twists was 22, and the twist direction of the child twisted wire 3 and the parent twisted wire (conductor 1) was the same direction. In this case, the number of strands 2 used was 594, and the outer diameter of the electric wire 10 was about 17.0 mm. The conductor resistance value of the produced electric wire 10 of Example 1-2 was 0.188 Ω / km, and it was confirmed that the above standard was satisfied.

  Thus, in Example 1-1 and Example 1-2 according to the present embodiment, the outer diameter of the electric wire 10 is about 9% to about 9% compared to the conventional example 1 while satisfying the standard conductor resistance value. It can be seen that the diameter of the wire 10 can be reduced by 10%, and the electric wire 10 that can be easily bent and wired can be realized. Further, in Example 1-1 according to the present embodiment, the number of strands 2 can be reduced by 46 (about 7.12%) compared to Conventional Example 1, and in Example 1-2, Compared with Conventional Example 1, the number of strands 2 can be reduced by 52 (about 8.05%), and the wire 10 can be further reduced in diameter, improved in flexibility, reduced in weight, and reduced in cost. You can see that it contributes. The number of parent twists and the number of child twists are not limited to those of Example 1-1 and Example 1-2. For example, the number of parent twists may be 30 and the number of child twists may be 20.

  Similarly, Example 2, Conventional Example 2 with 125 SQ, and Example 3, Conventional Example 3 with 150 SQ were also examined. In Examples 2 and 3, as in Examples 1-1 and 1-2, the number of parent twists is equal to or greater than the number of child twists, and the twist direction of the child twisted wire 3 and the parent twisted wire (conductor 1) is the same direction. The number of parent twists and the number of child twists satisfying the conductor resistance values specified in JIS standards were selected. Conventional examples 2 and 3 are 125SQ and 150SQ electric wires that have been generally used in the prior art. Like conventional example 1, the number of parent twists is less than the number of child twists, and the child twisted wire 3 and the parent twisted wire (conductor 1) The twist direction of is opposite. The results are summarized in Table 1.

  As shown in Table 1, in Examples 2 and 3 according to the present embodiment, the number of strands 2 is smaller than that in Conventional Examples 2 and 3 while satisfying the conductor resistance value specified in the JIS standard. Can be reduced by 7% or more. That is, according to the present embodiment, it is understood that the diameter of the electric wire 10, the improvement in flexibility, the weight reduction, and the cost reduction can be achieved in any of 100SQ, 125SQ, and 150SQ. .

  Here, although the electric wire 10 which coat | covered the insulator 4 on the outer periphery of the conductor 1 was demonstrated, the conductor 1 is applicable to the cable of various forms. As shown in FIG. 2, the cable 20 according to the present embodiment includes a cable core 21 having one or more conductors 1 and a jacket 22 provided on the outer periphery of the cable core 21. In FIG. 2, as an example, the cable 20 is a coaxial cable having a cable core 21 in which an insulator 21 a and an outer conductor 21 b are sequentially provided on the outer periphery of the conductor 1. Is not limited to this. For example, the cable core 21 may be configured by bundling a plurality of the electric wires 10 of FIG. 1 or arranging them in parallel, and the jacket 22 may be provided so as to collectively cover the periphery.

(Operation and effect of the embodiment)
As described above, in the conductor 1 according to the present embodiment, the number of parent twists is equal to or greater than the number of child twists, and the twisting direction of the child twisted wire 3 and the parent twisted wire (conductor 1) is the same direction.

  Thereby, it becomes possible to reduce the useless gap between the strands 2 and to arrange the strands 2 more closely, and to reduce the diameter of the electric wire 10, improve flexibility, and reduce the conductor resistance value. Contribute to. Further, by reducing the conductor resistance value, it becomes possible to satisfy the standard even if the number of the strands 2 is further reduced, and the wire 10 is further reduced in diameter, improved in flexibility, reduced in weight, and reduced in cost. Contributes to Further, by increasing the number of parent twists and bringing the wires 2 into close contact with each other, the insulator 4 is less likely to enter the conductor 1, and the conductor 1 becomes slippery with respect to the insulator 4, thereby further improving flexibility. It becomes possible. That is, according to the present embodiment, it is possible to realize an electric wire 10 that can be easily bent and can be easily wired even in a small space such as in a switchboard. In addition, the effect by this Embodiment is especially remarkable in the electric wire 10 of 100 SQ or more with which the number of the strands 2 increases.

(Summary of embodiment)
Next, the technical idea grasped from the embodiment described above will be described with reference to the reference numerals in the embodiment. However, the reference numerals and the like in the following description are not intended to limit the constituent elements in the claims to the members and the like specifically shown in the embodiments.

[1] Of the above-described strand twisted wire (3), which is composed of a parent twisted wire obtained by twisting a plurality of strands (3) obtained by twisting a plurality of strands (2), and constituting the parent twisted wire The number of parent strands that is the number is equal to or more than the number of child strands that is the number of the strands (2) that constitute the child strand (3), and the strands of the strand (3) and the parent strand Conductor (1) in which the twisting direction is the same direction.

[2] The conductor (1) according to [1], wherein the element wire (2) is an annealed copper wire.

[3] The conductor (1) according to [1] or [2], wherein a lubricating oil is applied around the strand (2).

[4] The conductor (1) according to any one of [1] to [3], wherein a twist pitch of the parent twisted wire is larger than a twist pitch of the child twisted wire (3).

[5] An electric wire (10) comprising the conductor (1) according to any one of [1] to [4] and an insulator (4) provided on an outer periphery of the conductor (1). .

[6] A cable core (21) having one or more conductors according to any one of [1] to [4], and a jacket (22) provided on an outer periphery of the cable core (21). Cable (20) provided.

  While the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  The present invention can be appropriately modified and implemented without departing from the spirit of the present invention.

1 ... Conductor (parent twisted wire)
2 ... Wire 3 ... Stranded wire 4 ... Insulator 10 ... Electric wire

Claims (6)

A conductor composed of a parent stranded wire obtained by twisting a plurality of strands obtained by twisting a plurality of strands,
The number of parent strands that is the number of the strands of the strand that constitutes the parent strand is equal to or more than the number of strands that are the number of the strands that constitute the strand.
And the twist direction of the child twisted wire and the parent twisted wire is the same direction,
conductor. The strand is made of annealed copper wire,
The conductor according to claim 1. Lubricating oil is applied around the strands,
The conductor according to claim 1 or 2. The twist pitch of the parent twisted wire is larger than the twist pitch of the child twisted wire,
The conductor according to any one of claims 1 to 3. The conductor according to any one of claims 1 to 4,
An insulator provided on the outer periphery of the conductor,
Electrical wire. A cable core having one or more conductors according to any one of claims 1 to 4,
A jacket provided on the outer periphery of the cable core,
cable.

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