JP2017063006A - Conductor and coated cable - Google Patents

Abstract

An object of the present invention is to provide a conductor that can have stable conductivity without lowering the bending deformability and a covered electric wire in which the conductor is covered with an insulator. A central strand 21 forming a central layer 20 disposed in the center, a plurality of inner strands 31 forming an inner layer 30 in an outer diameter direction of the central strand 21, and an outer layer in an outer diameter direction of the inner layer 30. A conductor 10 having a three-layer structure composed of a plurality of outer strands 41 forming 40, the outer strand 41 being a large-diameter strand 42 having a smaller diameter than the inner strand 31 and a large-diameter strand The inner layer 30 is formed of eight or more inner strands 31 that circumscribe the central strand 21 and the adjacent inner strand 31, and the outer layer 40 is composed of a thin strand 43 having a smaller diameter than 42. The large-diameter strands 42 and the thin-diameter strands 43, which are the same number as the inner strands 31, are alternately arranged, the two adjacent inner strands 31 and the large-diameter strand 42 are circumscribed, and The thin wire 43 is formed by circumscribing the inner wire 31 and the large wire 42. [Selection] Figure 2

Description

The present invention relates to a conductor used for, for example, a wire harness or a battery cable routed in a vehicle, and a covered electric wire in which the conductor is covered with an insulator.

  For example, in order to electrically connect an electronic device mounted on a vehicle such as an automobile and a battery, a covered electric wire in which a conductor obtained by assembling and twisting a plurality of core wires is covered with an insulator is used. It is desirable that the insulator covering such a conductor uniformly covers the outer peripheral portion of the conductor from the viewpoint of withstand voltage characteristics. For this reason, the shape of the cross section of the conductor is preferably circular.

As a conductor conventionally used, for example, as shown in FIG. 5, six core wires 121 arranged in the center and six inner strands 131 having the same diameter as the core wire 121 are arranged on the circumference of the core wire 121. There is a conductor 110 having a three-layer structure in which outer strands 141 having the same diameter as the twelve inner strands 131 are arranged around. Since the cross-sectional shape of the conductor 110 is substantially hexagonal as shown in FIG. 5, there is a problem that the thickness of the insulator covering the conductor 110, that is, the outer diameter of the electric wire is increased.
Further, the occupation ratio of the cross-sectional area of the conductor 110 with respect to the cross-sectional area of the virtual circle F1 inscribed in the outer strand 141 is as low as 0.76.

On the other hand, for example, Patent Document 1 proposes a conductor having a three-layer structure for the purpose of making the outer shape of a cross-section substantially circular without reducing the bending deformability.
The conductor described in Patent Document 1 has a three-layer structure composed of a core wire arranged in the center, an inner layer formed of a plurality of inner strands, and an outer layer formed of a plurality of outer strands. The conductor is a conductor, and the inner layer is arranged such that seven or more inner strands thinner than the core wire are in contact with the adjacent inner strand and the core wire. In the outer layer, the outer strand is composed of a large-diameter strand having the same diameter as the inner strand and a small-diameter strand disposed between the large-diameter strands, and the large-diameter strand is adjacent to the outer strand. The small-diameter strand is circumscribed with the inner strand, and the large-diameter strand is inscribed with a virtual circle that is inscribed.

  However, in the case where the conductor is manufactured with seven inner strands, the diameter of the inner strand is larger than the diameter of the inner strand so that the thin strand is in contact with the virtual circle inscribed with the inner strand and the large strand. However, since the diameter of the large-diameter element wire is increased, the above configuration cannot be satisfied, and the bending deformability may be deteriorated.

  Furthermore, even when the number of the inner strands is eight, as shown in FIG. 6, the diameter of the small-diameter strand 243 disposed between the large-diameter strands 242 becomes small, and the small-diameter strands 243 has a gap S between the inner strand 231 and the above configuration cannot be satisfied, and the small-diameter strand constituting the conductor jumps out of the conductor, or the cross-sectional shape collapses. And since the said large diameter strand 242 and the said small diameter strand 243 are partially dissociated, there existed a possibility that stable electroconductivity could not be ensured.

JP 2012-119073 A

  In view of the above-described problems, an object of the present invention is to provide a conductor that can have stable conductivity without lowering bending deformability and a covered electric wire in which the conductor is covered with an insulator.

  The present invention provides a three-layer structure comprising a core wire disposed in the center, a plurality of inner strands that form an inner layer in the outer diameter direction of the core wire, and a plurality of outer strands that form an outer layer in the outer diameter direction of the inner layer A conductor having a structure, wherein the outer strand is composed of a large-diameter strand having a smaller diameter than the inner strand and a small-diameter strand having a smaller diameter than the large-diameter strand; The large-diameter strands and the small-diameter strands are formed of eight or more inner strands that circumscribe the core wires and adjacent inner strands, and the outer layer has the same number as the inner strands. The two adjacent inner strands and the large-diameter strand are circumscribed, and the small-diameter strand is circumscribed to the inner strand and the large-diameter strand. It is formed.

The conductor refers to a conductor formed by the core wire, the plurality of inner strands arranged around the core wire, and the outer strand arranged around the inner layer. That is, the conductor refers to a region that can be electrically conducted.
The circumscribing of the above-mentioned large-diameter strands with adjacent inner strands means that the large-diameter strands are arranged in a groove formed by two adjacent inner strands in the cross section of the conductor.

According to the present invention, stable conductivity can be obtained without lowering the bending deformability.
More specifically, since the eight or more inner strands are in contact with the core wire and the adjacent inner strand, the inner strand has a smaller diameter than the core wire, and is on the circumference of the core wire. Are evenly arranged. Moreover, the said large diameter strand and the said small diameter strand are arrange | positioned uniformly at the outer periphery of an inner layer. For this reason, the inner strand and the outer strand do not remarkably improve the rigidity of the conductor, and do not deteriorate the bending deformability of the conductor.

  Moreover, since the said thin strand, the said inner strand, and the said large strand are circumscribed, the porosity between the said inner strand, the said large strand, and the said thin strand Can be reduced.

Furthermore, since the said large diameter strand is arrange | positioned in the groove | channel which the said inner side strand adjoins, and the said thin diameter strand is arrange | positioned in the radial direction arc part of the said inside strand, the said large diameter Since the radius of the large-diameter side virtual circle inscribed by the strand is substantially the same as the radius of the small-diameter virtual circle inscribed by the small-diameter strand, the large-diameter virtual circle that is the outer shape of the conducting wire And the porosity between the thin wire and the thin wire can be reduced.
Therefore, the occupation ratio of the cross-sectional area of the conductor with respect to the area of the large-diameter side virtual circle can be increased, and the conductivity of the conductor can be improved.

  Further, since the large-diameter strand is disposed in a groove formed by the adjacent inner strands, the small-diameter strand is gripped by two adjacent large-diameter strands and the inner strand. The Rukoto. For this reason, even when the conductor is twisted or deformed, the outer strand can be prevented from moving from a predetermined position easily, and the shape of the cross section of the conductor can be destroyed. Can be prevented. Therefore, stable conductivity can be ensured.

As an aspect of the present invention, the large-diameter strand and the small-diameter strand are inscribed in the same virtual circle.
According to the present invention, the conductivity of the conductor can be improved.

  More specifically, since the virtual circle is the same as the large-diameter side virtual circle and the small-diameter side virtual circle, the ratio of the cross-sectional area of the conductor to the area of the virtual circle can be increased. Therefore, the conductivity of the conductor can be improved.

  Further, since the ratio of the cross-sectional area of the conductor to the virtual circle is increased, the same cross-sectional area as that of the conventional conductor can be manufactured with a small-diameter conductor. That is, the conductor can be made compact.

  Further, since the outer shape of the cross section of the conductor can be formed in a substantially circular shape, the thickness of the insulator covering the conductor can be made uniform, and the thickness of the insulator covering the conductor in the predetermined direction Can be prevented from becoming thin. Therefore, it is possible to reduce a possibility that a predetermined portion of the conductor is damaged by an external force.

Further, as an aspect of the present invention, the number of the inner strands may be 12 or less.
By this invention, the area of the interface of the said inner strand which contacts the said core wire can be reduced, and the resistance value between the said core wire and the said inner strand can be reduced. Thereby, desired electrical conductivity can be ensured for the conductor.

  In addition, since the number of strands constituting the conductor can be reduced, it is not necessary to prepare a large number of strands and arrange them on the circumference of the core wire, thereby preventing the manufacturing work of the conductor from becoming complicated. .

Further, as an aspect of the present invention, a ratio of the diameter of the thin strand to the diameter of the large strand can be 0.730 or more.
According to the present invention, stable conductivity can be ensured.

  More specifically, when the ratio of the diameter of the small-diameter strand to the large-diameter strand is 0.730 or more, the diameter of the small-diameter strand relative to the large-diameter strand is smaller than a desired diameter. Can be prevented. Thereby, while being able to arrange | position the said thin diameter strand reliably between the said said large diameter strand, the contact area of the said thin diameter strand and the said large diameter strand can fully be ensured, The conductivity of the conductor can be stabilized.

Moreover, as an aspect of the present invention, the thickness of the small-diameter strand can be 0.1 mm or more and 2.0 mm or less.
According to the present invention, since the conductor can have a sufficient strength and flexibility, for example, even when the conducting wire is bent and deformed, the small-diameter strand is damaged such as tearing. The fear can be reduced.

The core wire, the inner strand, and the outer strand may be formed of the same kind of aluminum alloy.
According to the present invention, the weight of the conductor can be reduced as compared with conventionally used copper alloys.

  According to the present invention, it is possible to provide a conductor having predetermined conductivity and a covered electric wire in which the conductor is covered with an insulator without lowering the bending deformability.

The schematic perspective view of a covered electric wire. Sectional drawing of a conductor. Explanatory drawing of an inner layer and an outer layer. Explanatory drawing of another conductor. Sectional drawing of the conventional conductor. Explanatory drawing of the conventional conductor.

  FIG. 1 is a schematic perspective view of the covered electric wire 1, and FIG. 2 is a front sectional view of the conductor 10. FIG. 3 is an explanatory diagram of the inner layer 30 and the outer layer 40 that form the conductor 10. Specifically, FIG. 3A shows a front sectional view of the entire conductor 10, and FIG. 3B shows an enlarged sectional view of a region surrounded by a two-dot chain line in FIG. 3A.

FIG. 4 is an explanatory diagram of another conductor 10a. Specifically, FIG. 4A shows a cross-sectional view of another conductor 10a, and FIG. 4B shows a cross-sectional view of a conductor 310 used for comparison with the other conductor 10a. FIG. 5 is a front cross-sectional view of a conductor 110 that is an example of a conventionally used conductor, and FIG. 6 is an explanatory diagram of a conductor 210 that is an example of a conductor described in Patent Document 1. Specifically, FIG. 6A shows a front sectional view of the entire conductor 210, and FIG. 6B shows an enlarged sectional view of a region surrounded by a two-dot chain line in FIG. 6A.
2 to 6, the front surface refers to a surface perpendicular to the longitudinal direction of the covered electric wire 1.

As shown in FIG. 1, the covered electric wire 1 includes a conductor 10 formed by twisting a plurality of strands on a core wire arranged at the center, and a covering resin 50 that is an insulator covering the circumferential direction of the conductor 10. It is composed.
Here, the coating resin 50 made of an insulator is a cylindrical body having a through hole in the center portion, and the inner diameter thereof is the same as the diameter of a virtual circle F described later.

  As shown in FIG. 2, the conductor 10 is composed of a central layer 20 formed by the central strand 21, an inner layer 30 formed by the inner strand 31, and an outer layer 40 formed by the outer strand 41. It is a conductor with a three-layer structure.

  The central element wire 21 which is the central layer 20 is an aluminum core wire having a circular cross section disposed at the center of the conductor 10, and the diameter d1 thereof is d1 = 0.34 mm.

The inner layer 30 is formed of eight inner strands 31 arranged so as to circumscribe the central strand 21 and the adjacent inner strand 31.
As shown in FIG. 2, the inner strand 31 is an aluminum core wire having a circular cross section made of the same material as the central strand 21, and its diameter d2 is 0.62 times the diameter d1 of the central strand 21. D2 = 0.221 mm.

  The outer layer 40 is configured by arranging outer strands 41 along the inner layer 30.

  Specifically, the outer strand 41 is composed of a large-diameter strand 42 having a smaller diameter than the inner strand 31 and a small-diameter strand 43 having a smaller diameter than the large-diameter strand 42. The same number of large-diameter strands 42 and small-diameter strands 43 as the strands 31 are alternately arranged.

  The large-diameter strand 42 is an aluminum core wire made of the same material as the central strand 21. The diameter d3 of the large-diameter strand 42 is 0.95 times the diameter d2 of the inner strand 31 and the length is d3 = 0.199 mm. As shown in FIG. It is arranged in the groove to be formed.

  On the other hand, the thin wire 43 is an aluminum core wire made of the same material as the central wire 21, similarly to the large wire 42. The diameter d4 of the thin strand 43 is 0.75 times the diameter d3 of the large strand 42, and its length is d4 = 0.149 mm.

  As shown in FIG. 2, the thin strand 43 having such a configuration is an intersection of a straight line connecting the center of the central strand 21 and the center of the inner strand 31 and the arc of the inner strand 31 in the cross section. It is arranged to circumscribe That is, in the cross section, the imaginary line L connecting the center of the central strand 21, the center of the inner strand 31, and the center of the thin strand 43 is a straight line.

  The large-diameter strand 42 and the small-diameter strand 43 arranged in this way circumscribe the inner strand 31 and also circumscribe the adjacent large-diameter strand 42 and the small-diameter strand 43. As shown in FIGS. 2 and 3, the large-diameter strand 42 and the small-diameter strand 43 are inscribed in the same virtual circle F (corresponding to the inner circle of the coating resin 50).

  The conductor 10 having such a configuration includes eight inner strands 31 disposed on the outer periphery of the central strand 21, and a large-diameter strand 42 and a small-diameter strand 43 disposed on the outer diameter direction side of the inner layer 30. Are coated in the same direction, and the conductor 10 is covered with the covering resin 50 to form the covered electric wire 1.

The occupation ratio of the conductor 10 in the cross-sectional area of the covered electric wire 1 formed as described above will be described.
First, as shown in FIG. 2, since the line connecting the centers of the center strand 21, the inner strand 31, and the thin strand 43 becomes a straight line, the virtual circle F corresponding to the inner circle of the coating resin 50 is formed. The radius is the sum of the radius of the central strand 21, the diameter of the inner strand 31, and the diameter of the thin strand 43, and can be expressed as Equation 1.

したがって、仮想円Ｆの面積ｓは、数２で表すことができる。

Therefore, the area s of the virtual circle F can be expressed by Equation 2.

一方で、導体１０の断面積Ｓは、中心素線２１の断面積と、内層を形成する８本の内側素線３１の断面積と、外層を形成する８本の太径素線および細径素線の断面積の和であるため、数３で表せる。

On the other hand, the cross-sectional area S of the conductor 10 includes the cross-sectional area of the central strand 21, the cross-sectional area of the eight inner strands 31 forming the inner layer, the eight large-diameter strands and the small diameter forming the outer layer. Since it is the sum of the cross-sectional areas of the strands, it can be expressed by Equation 3.

したがって、仮想円Ｆの面積ｓに対する導体１０の断面積Ｓの割合（占有率Ｄ）は、Ｄ＝Ｓ／ｓで表せ、これにより算出される占有率は、Ｄ＝８７．１０％となる。

Therefore, the ratio (occupation ratio D) of the cross-sectional area S of the conductor 10 to the area s of the virtual circle F can be expressed by D = S / s, and the occupancy calculated by this is D = 87.10%.

  As described above, the center strand 21 that is the center layer 20, the plurality of inner strands 31 that form the inner layer 30 in the outer diameter direction of the center strand 21, and the plurality that forms the outer layer 40 in the outer diameter direction of the inner layer 30. A conductor 10 having a three-layer structure composed of an outer element wire 41, the outer element wire 41 having a smaller diameter than the inner element wire 31 and a smaller diameter than the larger diameter element wire 42. The inner layer 30 is formed of eight or more inner strands 31 circumscribing the central strand 21 and the adjacent inner strand 31, and the outer layer 40 is composed of the inner strand 31 and the inner strand 31. The large-diameter strands 42 and the small-diameter strands 43 having the same number are alternately arranged, the two adjacent inner strands 31 and the large-diameter strand 42 are circumscribed, and the inner strand 31 And the large-diameter strand 42 are formed by circumscribing the small-diameter strand 43 without reducing the bending deformability. It can have stable conductivity.

  More specifically, the inner strand 31 has a smaller diameter than the central strand 21, and the eight inner strands 31 are in contact with the central strand 21 and the adjacent inner strand 31. The line 31 is uniformly arranged on the circumference of the central strand 21. Further, the large-diameter strands 42 are uniformly disposed in the grooves formed by the inner strand 31, and the small-diameter strands 43 are uniformly disposed between the adjacent large-diameter strands 42. That is, the inner strands 31 having a diameter smaller than that of the central strand 21 are arranged uniformly on the circumference of the central strand 21 and thus the rigidity of the central strand 21 is not greatly improved. In addition, the large-diameter strand 42 having a large diameter in the outer strand 41 is disposed in the groove formed by the inner strand 31, and the small-diameter strand 43 has a small diameter. The rigidity of the strand 31 is not greatly improved. Therefore, the conductor 10 having such a configuration does not deteriorate the bending deformability as compared with the conventional method 110 or the like.

  Further, since the thin strand 43 having a smaller diameter than the large strand 42 is circumscribed by the inner strand 31 and the large strand 42, the inner strand 31, the large strand 42 and the small diameter are arranged. The porosity between the strands 43 can be reduced.

Further, as shown in FIG. 4A, when the large-diameter strand 42 and the small-diameter strand 43 are not inscribed in the same virtual circle F, the inner strands 31 adjacent to the large-diameter strand 42 are adjacent to each other. Since the thin strand 43 is disposed in the radially outward arc portion of the inner strand 31, it is disposed in the groove to be formed, so that the radius of the large-diameter side virtual circle Fb inscribed by the large strand 42 and the small diameter The diameter is substantially the same as the radius of the small-diameter side virtual circle Fs with which the strand 43 is inscribed. For example, as shown in FIG. 4B, this is clear when compared with a comparative conductor 300 in which the arrangement of the large-diameter element wire 42 and the small-diameter element wire 43 is reversed. Thus, by providing the said structure, the space | gap which arises between the large diameter side virtual circle Fb and the small diameter strand 43 which surround the cross-sectional external shape of conducting wire can be reduced.
Therefore, the occupation ratio of the cross-sectional area of the conductor 10 with respect to the area of the large-diameter side virtual circle Fb can be increased, and the conductivity of the conductor 10 can be improved.

Further, since the large-diameter element wire 42 is arranged in the groove formed by the adjacent inner element wires 31, the small-diameter element wire 43 is gripped by the two adjacent large-diameter element wires 42 and the inner element wire 31. Will be. For this reason, even when the conductor 10 is twisted or deformed, it is possible to prevent the outer strand 41 from moving from a predetermined predetermined position, and the shape of the cross section of the conductor 10 is broken. Can be prevented.
More specifically, for example, as shown in FIG. 6, in the central strand 221 described in Patent Document 1, a gap is generated between the inner strand 231 and the narrow strand 243. When the wire 221 is bent and deformed, the thin wire 243 may jump out to the outside, or the large wire 242 may enter the gap and the cross-sectional shape of the central wire 221 may be destroyed.

  However, since the conductor 10 has the large-diameter strand 42 inserted into the groove formed by the inner strand 31 and is sandwiched and held between the small-diameter strands 43 that circumscribe the inner strand 31, the inner layer 30 and the outer layer 40. And the large-diameter strand 42 and the small-diameter strand 43 are not easily moved. Therefore, even when an external force is applied to the conductor 10, the cross-sectional shape of the conductor 10 is not easily collapsed, and stable conductivity can be ensured.

  Further, since the large-diameter strand 42 and the small-diameter strand 43 are inscribed in the same virtual circle F, the conductivity of the conductor 10 can be improved.

  More specifically, in the conductor 10 in which the virtual circle F is inscribed in the large-diameter strand 42 and the small-diameter strand 43, the large-diameter side virtual circle Fb and the small-diameter side virtual circle Fs shown in FIG. Yen F. In other words, the gap generated in the conductor 10 can be minimized, and the ratio of the cross-sectional area of the conductor 10 to the area of the virtual circle F can be increased. Therefore, the conductivity of the conductor 10 can be improved.

  Further, since the ratio of the cross-sectional area of the conductor 10 to the virtual circle F is increased, a conductor having the same cross-sectional area as that of the conventional conductor 10 can be manufactured as the conductor 10 having a smaller diameter than that of the conventional conductor 10. Can be made compact.

  Further, by increasing the number of inner strands 31 in contact with the circumferential direction of the central strand 21, that is, by increasing the number of inner strands 31, the occupation ratio D of the cross-sectional area of the conductor with respect to the area of the virtual circle F increases. To do.

  More specifically, when the number of the inner strands 31 is 8, the occupation ratio D is D = 87.10%, whereas when the number of the inner strands 31 is 12, the occupation ratio D is 87.10%. The rate D is D = 88.39%.

  Furthermore, since the large-diameter strand 42 and the small-diameter strand 43 are inscribed in the virtual circle F, the gap formed between the virtual circle F, the large-diameter strand 42, and the small-diameter strand 43 is minimized. It is possible to prevent the large-diameter strand 42 and the small-diameter strand 43 from easily moving from a predetermined position. That is, the outer shape of the cross section of the conductor 10 can be prevented from being broken, the outer shape of the cross section of the conductor 10 can be formed in a substantially circular shape, and the thickness of the coating resin 50 covering the conductor 10 can be made uniform. Thereby, it can prevent that the thickness of the coating resin 50 which coat | covers the conductor 10 becomes thin in a predetermined direction, and can reduce the possibility that the predetermined location by the external force will be damaged to the conductor 10. FIG.

Furthermore, by setting the number of the inner strands 31 arranged in the circumferential direction of the central strand 21 to 8 which is 12 or less, the inner strand 31 circumscribing the central strand 21 and the inner strand 31 and the circumscribed The area of the interface between the outer strand 41 and the inner strand 31 can be reduced, the resistance value between the center strand 21 and the inner strand 31 can be reduced, and the conductor 10 can have a desired conductivity.
Moreover, since the number of the strands which comprise the conductor 10 can be reduced, it can prevent that the manufacturing operation of the conductor 10 becomes complicated.

Furthermore, when the ratio of the diameter of the small-diameter strand 43 to the diameter of the large-diameter strand 42 is 0.730 or more, stable conductivity can be ensured.
More specifically, since the ratio of the diameter of the small-diameter strand 43 to the large-diameter strand 42 is 0.730 or more and 0.750, the diameter of the small-diameter strand 43 relative to the large-diameter strand 42 is larger than the desired diameter. Can also be prevented from becoming thin. Thereby, while being able to arrange | position the small diameter strand 43 reliably between the adjacent large diameter strands 42, the contact area of the small diameter strand 43 and the large diameter strand 42 can fully be ensured, and a conductor The conductivity of 10 can be stabilized.

  Furthermore, since the thickness of the thin wire 43 is not less than 0.1 mm and not more than 2.0 mm, the conductor 10 can be configured to have sufficient strength and flexibility. Even when the wire is bent and deformed, the risk of damage such as tearing of the conductor 10 can be reduced.

  Furthermore, since the center strand 21, the inner strand 31, and the outer strand 41 are the same type of aluminum alloy, the weight of the conductor 10 can be reduced as compared with a conventionally used copper alloy.

In addition, this invention is not limited only to the structure of the above-mentioned embodiment, Many embodiments can be obtained.

  In the present embodiment, the conductor 10 is a stranded conductor in which the inner strand 31, the large strand 42, and the small strand 43 are twisted in the same direction with the central strand 21 as the center. The inner strand 31 is arranged along the central strand 21 to form the inner layer 30, and the thick strand 42 and the thin strand 43 are arranged in the longitudinal direction of the inner layer 30. It is good also as a structure which arrange | positions and forms the outer layer 40. FIG.

1 Coated wire 10 Conductor 21 Center wire
30 Inner layer
31 Inside wire
40 outer layer
41 Outer strand 42 Large diameter strand
43 Thin wire
F virtual circle

Claims (7)

A three-layered conductor composed of a core wire arranged in the center, a plurality of inner strands forming an inner layer in the outer diameter direction of the core wire, and a plurality of outer strands forming an outer layer in the outer diameter direction of the inner layer There,
The outer strand is composed of a large-diameter strand that is smaller in diameter than the inner strand, and a small-diameter strand that is smaller in diameter than the large-diameter strand,
The inner layer is formed of eight or more inner strands circumscribing the core wire and the adjacent inner strand;
The outer layer alternately arranges the large-diameter strands and the thin-diameter strands that are the same number as the inner strand, and the two adjacent inner strands and the large-diameter strand are A conductor which is circumscribed and formed by circumscribing the small-diameter strand to the inner strand and the large-diameter strand. The conductor according to claim 1, wherein the large-diameter strand and the small-diameter strand are inscribed in the same virtual circle. The conductor according to claim 1 or 2, wherein the number of the inner strands is 12 or less. The conductor according to any one of claims 1 to 3, wherein a ratio of a diameter of the thin strand to a diameter of the large strand is 0.730 or more. The conductor according to any one of claims 1 to 4, wherein a thickness of the thin strand is 0.1 mm or more and 2.0 mm or less. The conductor according to any one of claims 1 to 5, wherein the core wire, the inner strand, and the outer strand are formed of the same kind of aluminum alloy. The conductor according to any one of claims 1 to 6,
A covered electric wire covered with an insulator.

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