KR20240049169A - Conductor for cable with excellent flexibility - Google Patents

Abstract

In the cable conductor, which is formed as a composite wire formed by twisting a plurality of bundled wires formed by twisting a plurality of element wires, the conductor is formed by surrounding a central conductor including the bundled wire and the outer periphery of the central conductor. It includes one or more external conductor layers, is 0.5 to 1, (where, is the ratio of the collective pitch ratio of the n layer and the n+1 layer; is 0.5 to 1 (where, is the ratio of the composite pitch ratio of the n-layer and the n+1 layer, satisfying the n-layer composite pitch ratio/n+1-layer composite pitch ratio, where n is an integer equal to or greater than 0).

Description

Conductor for cables with excellent flexibility {CONDUCTOR FOR CABLE WITH EXCELLENT FLEXIBILITY}

The present invention relates to a conductor for a cable with excellent flexibility, and more specifically, to a conductor for a cable with excellent flexibility that satisfies the basic electrical characteristics required as a conductor and ensures flexibility while suppressing excessive use of unnecessary conductors. .

Aluminum and aluminum alloy wires have mechanical/electrical characteristics that are different from copper wires, so their application frequency is increasing in certain fields. From the perspective of securing the required current of the conductor, aluminum has an electrical conductivity of about 60% compared to copper, so it must have a unit area of about 170% compared to copper. When the unit area of the conductor, that is, the outer diameter of the conductor, is increased, the bending rigidity (EI) or reaction torque, which are usually one of the measures of flexibility, increases, resulting in a decrease in the flexibility of the finished product.

Since the flexibility of wires is managed as an important physical property regardless of the product's application field, structural design of conductors in aluminum wires with larger outer diameters is more difficult than wires using copper conductors in terms of securing flexibility.

In general, when using an aluminum conductor, the thickness of the wire is made thinner or the ratio of the aggregate pitch and complex pitch is designed to be small as a way to ensure the flexibility of the wire. However, if the thickness of the wire is reduced, the manufacturing cost of the product increases, and if the ratio of the aggregate pitch and composite pitch is reduced, the resistance of the final product increases, which leads to the use of more overlapping conductors than necessary.

Korea Patent Publication No. 10-2020-0122156 (2020.10.27.)

Accordingly, the technical problem of the present invention was conceived in this regard, and the purpose of the present invention is to provide a highly flexible cable conductor that satisfies the basic electrical characteristics required as a conductor and can secure flexibility while suppressing excessive use of unnecessary conductors. It is provided.

A cable conductor according to an embodiment for realizing the object of the present invention described above is a cable conductor formed of a composite wire formed by twisting a plurality of bundled wires formed by twisting a plurality of element wires, wherein the conductor is formed by twisting a plurality of wires. It includes a central conductor including a line and one or more outer conductor layers formed to surround the outer periphery of the central conductor,

is 0.5 to 1, (where, is the ratio of the collective pitch ratio of the n layer and the n+1 layer; is 0.5 to 1 (where, is the ratio of the composite pitch ratio of the n layer and the n+1 layer and satisfies the n layer composite pitch ratio/n+1 layer composite pitch ratio, where n is a natural number.

In one embodiment of the present invention, the equation below can be satisfied.

(here, is the ratio of the collective pitch ratio of the n layer and the n+1 layer, where n layer collective pitch ratio/n+1 layer collective pitch ratio, is the ratio of the composite pitch ratio of the n layer and the n+1 layer (n layer composite pitch ratio/n+1 layer composite pitch ratio)

In one embodiment of the present invention, the collective pitch of each layer of the central conductor and the outer conductor layers may be 24 mm to 96 mm.

In one embodiment of the present invention, the composite pitch of each layer of the central conductor and the outer conductor layers may be 65 mm to 465 mm.

In one embodiment of the present invention, the diameter of the wires constituting the set of wires may be 0.55 mm or less.

In one embodiment of the present invention, the number of wires constituting the set of lines may be 7 or more.

In one embodiment of the present invention, the wires constituting the bundled wires may contain 99.7% or more of aluminum (Al).

In one embodiment of the present invention, the wires constituting the assembly wire are aluminum (Al), silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), and chromium (Cr). ) and zinc (Zn).

According to the present invention, the cable conductor according to the present invention can increase the flexibility of the cable while minimizing the amount of conductor used by adjusting the pitch ratio of the central conductor and the outer conductor layer surrounding the central conductor.

1 is a diagram for explaining the concept of “pitch ratio” used in the present invention.
Figure 2 is a cross-sectional view showing a conductor for a cable according to an embodiment of the present invention.
Figure 3 is a diagram showing the 3 Point Bend Test facility.

Since the present invention can be subject to various changes and can have various forms, embodiments will be described in detail in the text. However, this is not intended to limit the present invention to a specific disclosed form, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present invention. While describing each drawing, similar reference numerals are used for similar components. Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The above terms are used only for the purpose of distinguishing one component from another. The terms used in this application are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this application, terms such as "comprise" or "consist of" are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which the present invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted in an ideal or excessively formal sense unless explicitly defined in the present application. No.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a diagram for explaining the concept of “pitch ratio” used in the present invention.

Referring to FIG. 1, the term “pitch ratio” used in the present invention can be defined by Equation 1 below.

Equation 1

Looking at Equation 1, the “pitch ratio” may mean the pitch value (mm) relative to the layer depth (mm). Here, "layer diameter" means the diameter of the virtual circle connecting the centers of the lines placed on the outermost layer of the group line in the case of a group line, and the diameter of the virtual circle connecting the centers of the lines placed on the outermost layer of the composite line in the case of a composite line. means the diameter of the circle. A set wire refers to a form of conductor where several wires are placed in parallel and then twisted in one direction. Each wire has the same cross-sectional area, and the area of the set wire is equal to the sum of the cross-sectional areas cut perpendicular to the twist angle of each wire. In addition, a composite wire refers to a form of conductor where several bundled wires are placed in parallel and then twisted in one direction. The cross-sectional area of the composite wire is equal to the total cross-sectional area cut perpendicular to the twist angle of the wires that make up the bundled wire. Therefore, the “composite line pitch ratio” described later can be defined as the collective pitch value (mm) to the aggregate line layer depth (mm), and the “composite line pitch ratio” is the composite pitch to the composite line layer depth (mm). It can be defined as a value (mm). In addition, when the conductor forms a plurality of layers, the “composite pitch ratio” of the layer may be defined as the composite pitch value (mm) relative to the composite wire layer diameter (mm) of the first layer in the case of the first layer, In the case of the second floor, it can be defined as the composite pitch value (mm) for the composite line depth diameter (mm) of the second floor.

Figure 2 is a cross-sectional view showing a conductor for a cable according to an embodiment of the present invention.

Referring to FIG. 2, the conductor for a cable according to an embodiment of the present invention may be composed of a plurality of layers.

The cable conductor according to an embodiment of the present invention may be formed by combining a plurality of wires (10) with a diameter of 0.55 mm or less by combining a plurality of aggregate conductors into a plurality of layers, for example, arranged around the centrally located aggregate conductor. a first composite layer 100 formed by a plurality of aggregate conductors, a second composite layer 200 formed by a plurality of aggregate conductors disposed around the first composite layer 200, and the second composite layer (200) may include a third composite layer 300 formed by a plurality of collective conductors arranged around the periphery.

Here, the plurality of wires 10 included in the aggregate conductor are twisted with each other at a constant aggregate pitch, and the aggregate conductors included in each composite layer are twisted with each other at a different composite pitch for each layer.

A conductor for a cable according to an embodiment of the present invention may be formed as a set of wires formed by twisting a plurality of wires. Additionally, a plurality of the set lines may be twisted together to form a composite line.

The cable conductor may form a central conductor including the assembly line and one or more outer conductor layers surrounding the outer circumference of the central conductor. Figure 2 shows a structure formed of a central conductor and two layers formed by wrapping the outer circumference of the central conductor.

A conductor for a cable according to an embodiment of the present invention may include a central conductor including a bundled wire and one or more outer conductor layers formed to surround the outer circumference of the central conductor.

At this time, may be 0.5 to 1. here, is the ratio of the collective pitch ratio of the n layer and the n + 1 layer, where n layer collective pitch ratio / n + 1 layer collective pitch ratio, n is an integer greater than 0, and 0 layer means the central conductor. also, may be 0.5 to 1. here, is the ratio of the composite pitch ratio of the n layer and the n+1 layer, where n layer composite pitch ratio/n+1 layer composite pitch ratio, and n is a natural number.

For example, the ratio of the collective pitch ratio of the central conductor to that of the first outer conductor layer directly surrounding the central conductor may be 0.5:1 to 1:1. That is, the aggregate pitch ratio of the central conductor may be 0.5 to 1 times the aggregate pitch ratio of the first outer conductor layer. Additionally, the ratio of the composite pitch ratio of the first layer to the composite pitch ratio of the second layer surrounding the first layer may be 0.5:1 to 1:1. That is, the composite pitch ratio of the first layer may be 0.5 to 1 times the composite pitch ratio of the second layer.

Additionally, the conductor for a cable according to an embodiment of the present invention can satisfy Equation 1 below.

Equation 1

here, is the ratio of the collective pitch ratio of the n layer and the n+1 layer, where n layer collective pitch ratio/n+1 layer collective pitch ratio, is the ratio of the composite pitch ratio of the n layer and the n+1 layer, meaning n layer composite pitch ratio/n+1 layer composite pitch ratio.

Additionally, the collective pitch of each layer of the central conductor and the outer conductor layers may be 24 mm to 96 mm, and the composite pitch of each layer of the central conductor and the outer conductor layers may be 65 mm to 465 mm.

The central conductor may be formed as a bundle of wires formed by twisting a plurality of wires, and the outer conductor layers may be formed by twisting a plurality of wires formed by twisting a plurality of wires. The wires constituting the set lines may have a diameter of 0.55 mm or less.

Additionally, the number of wires constituting the set of lines may be 7 or more to maintain a circular shape. For example, when the set line is formed of seven wires, it may have a structure in which six wires are arranged around one central wire.

A conductor for a cable has the property that the characteristics of the conductor are determined by the ratio of the pitch ratio, regardless of the conductor diameter that makes up the conductor. Accordingly, the characteristics of the cable conductor according to the present invention are described in terms of “pitch ratio”. In the present invention, the values of collective pitch and composite pitch are limited. This limits the diameter of the wires constituting the set wire to 0.55 mm or less. However, as the diameter of the wire becomes smaller, the manufacturing cost increases, so in consideration of economic issues, the diameter of the wires making up the set wire should not exceed a predetermined value. This is so that you can have it. Therefore, the set pitch and complex pitch were limited so that the wire diameter was not designed to be smaller than a predetermined value.

The wires constituting the set wires may contain 99.7% or more of aluminum (Al).

In addition, the wires constituting the assembly line include aluminum (Al), silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), chromium (Cr), and zinc (Zn). It may be included, and at this time, the total of the remaining materials excluding aluminum may be included in a ratio of 2% or less.

[Example]

Manufacturing example

Conductors for cables were manufactured with the configurations shown in Tables 1 to 3 below.

group player composite structure center First floor Second floor 3rd Floor Example 1 13 One 6 12 Example 2 25 One 6 12 Example 3 13 One 6 12 Example 4 13 One 6 12 Example 5 7 One 6 12 18 Example 6 7 One 6 12 18 Comparative Example 1 13 One 6 12 Comparative Example 2 13 One 6 12 Comparative Example 3 13 One 6 12 Comparative Example 4 13 One 6 12 Comparative Example 5 13 One 6 12 Comparative Example 6 13 One 6 12

Peach B set pitch ratio composite pitch ratio center First floor Second floor 3rd Floor First floor Second floor 3rd Floor Example 1 18 18 29 15 17 Example 2 18 18 29 15 17 Example 3 12 15 18 15 17 Example 4 18 18 24 11 16 Example 5 18 24 30 34 15 17 19 Example 6 18 24 30 34 15 17 24 Comparative Example 1 11 25 25 15 17 Comparative Example 2 11 10 15 10 17 Comparative Example 3 18 18 24 10 23 Comparative Example 4 18 18 24 15 14 Comparative Example 5 12 12 30 10 20 Comparative Example 6 18 18 18 10 9

Peach B
ratio Set by floor
ratio of pitch ratio an Complex by floor
Pitch ratio bn an +bn
Aggregate/composite ratio a0 a1 a2 b1 b2 a1+b1 a2+b2 Example 1 1.0 0.6 0.9 1.5 Example 2 1.0 0.6 0.9 1.5 Example 3 0.8 0.8 0.9 1.7 Example 4 1.0 0.8 0.7 1.5 Example 5 0.8 0.8 0.9 0.9 0.9 1.7 1.8 Example 6 0.8 0.8 0.9 0.9 0.7 1.7 1.6 Comparative Example 1 0.4 1.0 0.9 1.9 Comparative Example 2 1.1 0.7 0.6 1.3 Comparative Example 3 1.0 0.8 0.4 1.2 Comparative Example 4 1.0 0.8 1.1 1.9 Comparative Example 5 1.0 0.4 0.5 0.9 Comparative Example 6 1.0 1.0 1.1 2.1

2. Physical property evaluation

1) Flexibility evaluation

Examples and Comparative Examples: Reaction torque and bending rigidity were measured for each conductor through a 3-point bending test, and comparative evaluation was performed.

The cable conductor used as a control for flexibility evaluation is a conductor that satisfies the same target resistance as the conductor presented in the examples and comparative examples, the type of wire used is the same, and the composite pitch ratio for each layer is arbitrarily determined, but the ratio for each layer is the same. . As the pitch ratio of the conductors is set to be the same, if the target resistance is not met, the number of wires constituting the aggregate wire is increased. Figure 3 shows the 3 Point Bend Test facility. For the fixture and test method required for the 3 Point Bend Test, refer to ASTM E290 and select conditions appropriate for the diameter of the conductor.

Flexibility Assessment Bending strength (N) Judgment Example 1 147 pass Example 2 140 pass Example 3 136 pass Example 4 153 pass Example 5 150 pass Example 6 158 pass Comparative Example 1 186 fail Comparative Example 2 166 fail Comparative Example 3 171 fail Comparative Example 4 162 fail Comparative Example 5 184 fail Comparative Example 6 162 fail

As summarized in Table 4, the cable conductors of Examples 1 to 6 according to the present invention satisfied the flexibility evaluation criteria with a bending strength of 160 N or less, and in the case of Comparative Examples 1 to 6, the bending strength exceeded 160 N. The flexibility evaluation criteria were not met.

2) Evaluation of conductor sticking

For each conductor in Examples and Comparative Examples, if the unit weight was more than 10% greater than the unit weight of the single-wire conductor that had the maximum resistance that satisfied the standard, it was evaluated as conductor over-bonding.

3) Shape stability evaluation

Shape stability is an emotional evaluation that determines whether the macroscopic shape of the conductor maintains its original shape. Normal electric wires go through a taping or insulation process on the conductor. At this time, if the shape of the conductor is not stable, the surface may be uneven after taping or insulation, or the insulation work itself may not work. Shape stability is assessed by determining whether there are traces of conductors on the exterior of the wire after taping or insulation. In other words, if twisted traces of the conductor are clearly observed on the exterior of the conductor after taping or insulation, or if workability is not secured, it is determined that the shape stability is insufficient.

The physical property evaluation results are as shown in Table 5 below.

Cause of defect flexibility Conductor overload conductor formation Example 1 Good Good Good Example 2 Good Good Good Example 3 Good Good Good Example 4 Good Good Good Example 5 Good Good Good Example 6 Good Good Good Comparative Example 1 error Good Good Comparative Example 2 Good error Good Comparative Example 3 Good Good error Comparative Example 4 Good error Good Comparative Example 5 error Good Good Comparative Example 6 Good error Good

As summarized in Table 5, the cable conductors of Examples 1 to 6 according to the present invention simultaneously achieve excellent flexibility and conductor seizure prevention, which are in a trade-off relationship, through precisely adjusted composite pitch and collective pitch for each layer. It was confirmed that the shape stability was excellent.

On the other hand, in Comparative Example 1, the lower limit ratio among the ratios for each set of layers was below the standard (a1 was 0.4, the standard value was 0.5 or more), causing a problem in which flexibility was greatly reduced. In the cable conductor of Comparative Example 2, conductor over-bonding occurred because the upper limit ratio among the aggregate layer ratios was higher than the standard (a1 was 1.1, the standard value was 1.0 or less).

In the cable conductor of Comparative Example 3, the lower limit ratio among the composite layer ratios was below the standard (b1 was 0.4, the standard value was 0.5 or more), so the stability of conductor formation was low, and in the cable conductor of Comparative Example 4, the composite layer ratio was lower than the standard. It was confirmed that the problem of conductor sticking occurred when the upper limit ratio was higher than the standard (b1 was 1.1, the standard value was 1.0 or less).

In addition, in the cable conductor of Comparative Example 5, not only did the upper limit ratio of the aggregate layer ratios exceed the standard (a1 was 1.1, the standard value was 1.0 or less), but the aggregate/composite ratio was less than the standard (a1+b1 = 0.9, the standard value was more than 1.2). A significant decrease in flexibility was observed, and in the cable conductor of Comparative Example 6, the ratio of the lower limit among composite layer ratios was above the standard (b1 was 1.1, the standard value was 1.0 or less), and the aggregation/composite ratio was also above the standard (a1+b1). = 2.1, the standard value is 2.0 or less), it was confirmed that the problem of conductor sticking occurs significantly.

Although the above has been described with reference to embodiments, a person skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will be able to understand that it exists.

100: first composite layer
200: second composite layer
300: Third composite layer

Claims (8)

In the cable conductor formed as a composite wire formed by twisting a plurality of bundled wires formed by twisting a plurality of wires,
The conductor is
a central conductor including the assembly line; and
It includes one or more outer conductor layers formed surrounding the outer periphery of the central conductor,
is 0.5 to 1, (where, is the ratio of the collective pitch ratio of the n layer and the n+1 layer;
is 0.5 to 1 (where, is the ratio of the composite pitch ratio of the n-layer and n+1 layers, and is a cable conductor that satisfies the n-layer composite pitch ratio/n+1-layer composite pitch ratio, and n is a natural number.
The conductor for a cable according to claim 1, which satisfies the following equation.
(here, is the ratio of the collective pitch ratio of the n layer and the n+1 layer, where n layer collective pitch ratio/n+1 layer collective pitch ratio, is the ratio of the composite pitch ratio of the n layer and the n+1 layer (n layer composite pitch ratio/n+1 layer composite pitch ratio)
The conductor for a cable according to claim 1, wherein the aggregate pitch of each layer of the central conductor and the outer conductor layers is 24 mm to 96 mm.
The conductor for a cable according to claim 1, wherein the composite pitch of each layer of the central conductor and the outer conductor layers is 65 mm to 465 mm.
The cable conductor according to claim 1, wherein the diameter of the wires constituting the bundled wires is 0.55 mm or less.
The cable conductor according to claim 1, wherein the number of wires constituting the bundled wire is 7 or more.
The cable conductor according to claim 1, wherein the wires constituting the bundled wires contain 99.7% or more of aluminum (Al).
The method of claim 1, wherein the wires constituting the assembly line are aluminum (Al), silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), chromium (Cr), and zinc. A conductor for a cable characterized in that it contains (Zn).