KR20200013315A - Hybrid conductor comprising copper wires and copper clad aluminum wires - Google Patents

Abstract

The present invention relates to a hybrid conductor formed by combining a copper wire and copper-clad aluminum wire. More specifically, even though the hybrid conductor includes a copper-clad aluminum wire having a relatively high resistance compared to a copper wire, the reduction in the electrical properties may be minimized, the flexibility, bending properties, etc. may be maximized, and the reduction in manufacturing cost and weight reduction may be possible.

Description

Hybrid conductor comprising copper wires and copper clad aluminum wires

The present invention relates to a hybrid conductor formed by combining copper wire and copper-clad aluminum wire. Specifically, the present invention provides a hybrid conductor capable of reducing manufacturing cost and weight while maximizing flexibility, bending characteristics, etc. while minimizing the reduction of electrical characteristics, even though it includes copper-clad aluminum wire having a higher resistance than copper wire. It is about.

Typically, materials used as cable conductors are limited to copper, aluminum, silver, or alloys of high conductivity, and other materials have significantly lower electrical properties than those of copper mentioned above. This is too high to be suitable as a conductor material for cables.

Copper, which has been the most widely used material for cable conductors, has been used as a main material for a long time because of high electrical conductivity and low price, which are optimal conditions for cable conductor materials.

However, as the cost of purchasing copper, which is a major material for cable conductors, has increased due to the rise in international copper prices and raw material prices, the unit cost of cables has increased. In particular, the material of the conductor generally has a proportional relationship between the electrical properties of the material and the raw material price. Therefore, most of the materials that can substitute copper have lower electrical properties than copper and have excellent electrical properties. If the price is higher than copper.

In addition, the copper conductor is insufficient in flexibility, bending characteristics, and the like, and the specific gravity may be high, thereby reducing the flexibility, laying property, workability, etc. of the cable to which the copper conductor is applied. Therefore, research has been continued to use aluminum as a conductor material, which is low in electrical properties but low in price, excellent in flexibility, flexural characteristics, and the like, and has a low specific gravity, which makes the cable lightweight.

However, when aluminum is used as a cable conductor material, not only has a problem of lower electrical characteristics than copper, but also an oxide film formation problem that hinders electrical conduction due to a fast reaction rate, a problem caused by a relatively high heat generation rate, and lower than copper. Due to its electrical characteristics, the cross-sectional area of the cable conductor is increased compared to copper.

Therefore, there is an urgent need for a cable conductor capable of minimizing the reduction of electrical characteristics compared to conventional copper conductors, maximizing flexibility, bending characteristics, etc., and reducing manufacturing cost and weight.

An object of the present invention is to provide a cable conductor that maximizes flexibility, bending characteristics and the like while minimizing a reduction in electrical characteristics compared to conventional copper conductors.

In addition, it is an object of the present invention to provide a cable conductor that can reduce manufacturing cost and weight compared with conventional copper conductors.

In order to solve the above problems, the present invention,

A hybrid conductor formed by a combination of copper wire and copper aluminum wire, comprising at least one copper wire and at least one copper aluminum wire, wherein the copper wire is formed with a copper coating layer on the surface of an aluminum center line, and the total volume of the hybrid conductor is increased. As a reference, it provides a hybrid conductor, characterized in that the total volume of the aluminum centerline is 10 to 50%.

Here, the number Y of copper-clad aluminum wires is an integer that satisfies Equation 1 below, and provides a hybrid conductor.

[Equation 1]

0.1 A / {(X / 2) ² Π} ≤Y≤0.5 A / {(X / 2) ² Π}

In Equation 1,

A is the nominal cross-sectional area (mm2) of the hybrid conductor,

X is the diameter of the element wire (mm).

The hybrid conductor may include a plurality of copper-clad aluminum wires, and the plurality of copper-cable aluminum wires are mirrors based on an arbitrary straight line passing through the center of a center wire disposed at the center of the plurality of wires constituting the hybrid conductor. It provides a hybrid conductor, characterized in that arranged to be symmetrical or rotationally symmetric about the center.

And a point in time at which the conductor is broken while applying a load at a rate of 100 mm / min from the top at an intermediate point between the two spaced points while supporting the bottom of the hybrid conductor at two points spaced 200 mm apart from each other. The applied conductor at is not more than 85% of the load measured by the same method as above for a conductor composed of copper (Cu) wire only with the same conductor diameter, number of wires, and total diameter as the hybrid conductor. To provide.

Here, the hybrid conductor includes two or more element wire layers formed by a plurality of element wires disposed around the center element wire, and the copper-clad aluminum element wire is an element wire except for the outermost layer of the element wire layer. It provides a hybrid conductor, characterized in that disposed in the layer.

In addition, the number of element wires included in the n layer of the element wire layer is na pieces, wherein a is the number of element wires included in one layer of the element wire layer, provides a hybrid conductor.

And, the diameter of the element wire provides a hybrid conductor, characterized in that 0.3 to 3.3 mm.

On the other hand, the copper element has a copper (Cu) purity of 99.9% by weight or more, the total content of impurities excluding silver (Ag) and oxygen (O) is 100 ppm or less, to provide a hybrid conductor.

In addition, the aluminum center line provides a hybrid conductor, characterized in that the aluminum (Al) purity is at least 99.5% by weight, and the total content of the alloying elements except for aluminum is 0.5% by weight or less.

Although the hybrid conductor according to the present invention includes copper-clad aluminum wire having a relatively high resistance compared to copper wire, by precisely controlling the number and arrangement of copper-clad aluminum wire, flexibility, while minimizing the reduction of electrical characteristics compared to conventional copper conductors, It shows an excellent effect of maximizing bending characteristics.

In addition, the hybrid conductor according to the present invention exhibits an excellent effect of reducing the manufacturing cost and reducing the weight of the conventional copper conductor.

Figure 1 schematically shows the cross-sectional structure of a hybrid conductor of one embodiment according to the present invention.
Figure 2 schematically shows the cross-sectional structure of a hybrid conductor of another embodiment according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art. Like numbers refer to like elements throughout the specification.

Figure 1 schematically shows the cross-sectional structure of a hybrid conductor according to the present invention.

As shown in FIG. 1, the hybrid conductor according to the present invention may include a copper element wire 10 and a copper clad aluminum element wire 20.

Specifically, FIG. 1A illustrates a case in which two copper-clad aluminum wires 20 are included. FIG. 1B illustrates a case in which three copper-clad aluminum wires 20 are included. FIG. 1C illustrates four copper-clad aluminum wires 20. to be.

The copper wire 10 and the copper-clad aluminum wire 20 are not particularly limited in cross-sectional shape, but may be circular, for example.

The copper wire 10 may have a copper (Cu) purity of 99.9 wt% or more, and a total impurity content of 100 ppm or less, and the impurities do not include silver (Ag) and oxygen (O). In addition, the copper clad aluminum wire 20 may be formed with a copper cladding layer 22 on the surface of the aluminum center line 21, and the copper cladding layer 22 may be made of the same material as the copper wire 10. Meanwhile, the aluminum center line 21 may have an aluminum (Al) purity of 99.5 wt% or more, and a total content of other alloy elements of 0.5 wt% or less.

In addition, the diameter of the copper wire 10 and the copper-clad aluminum wire 20 may be different depending on the cable and conductor standards, for example, may be 0.3 to 3.3 mm.

Specifically, FIG. 2A illustrates a case in which two element layers are provided and the number of copper-clad aluminum wires 20 is 5, and FIG. 2B illustrates a case in which two element wire layers are provided and the number of copper-clad aluminum wires 20 is four.

As shown in FIG. 2, the hybrid conductor according to the present invention may have two or more element wire layers formed by a plurality of element wires arranged around a center element wire disposed at the center of the element wires in a cross section thereof. That is, the layer of element wires which are in direct contact with and disposed around the central element wire may be one layer, and the layer of element wires which are in contact with the element wires of the first layer and arranged around it may be two layers. It may be formed of a plurality of layers, for example three, four, five or the like.

The number of element wires included in the respective element wire layers may be different according to the diameter of the element wires. For example, the number of element wires included in the n layer may be na, and a is the element wire included in the first layer. Is the number of. That is, when the number of wires of one layer is six, the number of wires of two layers may be twelve, the number of wires of three layers may be 18, the number of wires of four layers may be 24, and the number of wires of five layers may be thirty.

In the hybrid conductor according to the present invention, the total volume of the aluminum center line 21 may be 10 to 50% based on the total volume of the hybrid conductor, preferably within the numerical range, It may be a maximum value that satisfies the nominal cross-sectional area of the required conductor, that is, electrical characteristics such as volume resistance according to the total cross-sectional area of the element wires constituting the conductor.

Here, when the total volume of the aluminum center line 21 is less than 10%, the flexibility, bending characteristics, etc. of the hybrid conductor may be insufficient, and the effect of reducing the manufacturing cost and lightening may be insignificant. The electrical characteristics of the conductor required by the cable standard cannot be met.

Based on this, the number Y of the copper-clad aluminum wire 20 in the hybrid conductor may be an integer that satisfies Equation 1 below.

[Equation 1]

0.1 A / {(X / 2) ² Π} ≤Y≤0.5 A / {(X / 2) ² Π}

In Equation 1,

A is the nominal cross-sectional area (mm2) of the hybrid conductor,

X is the diameter of the element wire (mm).

In addition, the central element wire of the hybrid conductor may be the copper element wire 10 or the copper aluminum element wire 20, and the plurality of copper element aluminum wires 20 among the element wires disposed around the core element wire while being in contact with the center element wire may be 1 and 2 may be arranged to be mirror symmetric based on any straight line passing through the center of the center element, or to be rotationally symmetrical with respect to the center. That is, when rotating the plurality of copper-clad aluminum wires 20 by, for example, 60 °, 120 °, 180 °, etc. with respect to the center of the center element wires, they may be disposed at positions that may overlap each other.

Further, each element layer may include one or more copper-clad aluminum element wires 20, and the copper element of the conductor may be considered in consideration of the skin effect of the conductor, i.e., when the current flows only in the vicinity of the surface of the conductor. The copper wire 10 having a lower resistance and excellent electrical characteristics compared to the aluminum wire 20 is disposed in the outermost layer of the wire layers, and the copper-clad aluminum wire 20 includes the center wire and preferably the inner layer, that is, the outermost layer. It may be advantageous in terms of securing electrical characteristics to be disposed on the element layer except for the outer layer.

As described above, the hybrid conductor according to the present invention is precisely controlled in the number and arrangement of copper wire 10 and copper-clad aluminum wire 20 so that bending load is 85% while minimizing reduction of electrical characteristics compared to conventional copper conductors. While exhibiting excellent effects of maximizing flexibility, bending characteristics, and the like, the manufacturing cost can be reduced and lighter than conventional copper conductors.

EXAMPLE

1. Preparation Example

A conductor having a wire structure as shown in Table 1 below was prepared.

Example Comparative example



Sectional structure

Wire diameter (mm) 2.2 2.2 Overall diameter (mm) 6.6 6.6 Cu wire number 5 7 CCA number of wires 2 0

2. Bending Characteristic Evaluation

EXAMPLES AND COMPARATIVE EXAMPLES Specimen fractured while applying a load at a rate of 100 mm / min from the top at the midpoint between the two spaced apart points, with the lower portion of each conductor supported at two 200 mm spaced points from each other The applied load at the time of the measurement was measured three times. The measurement results are shown in Table 2 below.

Example Comparative example Single measuring load (N) 60.8 71.8 2 measuring loads (N) 60.8 73.0 3 measuring loads (N) 61.3 73.3 Average load (N) 61.0 72.7 Standard Deviation 0.27 0.79 ratio 83.9% 100%

As shown in Table 2, it was confirmed that the flexural characteristics of the embodiment in which the copper (Cu) wire and the copper-clad aluminum wire (CCA) wire were combined were more stable than the conductors of the comparative example in which only the copper (Cu) wire was associated. .

Although the present specification has been described with reference to preferred embodiments of the invention, those skilled in the art may variously modify and change the invention without departing from the spirit and scope of the invention as set forth in the claims set forth below. Could be done. Therefore, it should be seen that all modifications included in the technical scope of the present invention are basically included in the scope of the claims of the present invention.

10 copper wire 20 copper copper aluminum wire

Claims (9)

A hybrid conductor formed by combining copper wire and copper aluminum wire,
At least one copper wire and at least one copper aluminum wire,
The copper-clad aluminum wire is formed with a copper coating layer on the surface of the aluminum center line,
The total volume of the aluminum centerline is 10 to 50% based on the total volume of the hybrid conductor. The method of claim 1,
The number Y of the copper-clad aluminum element wires is an integer satisfying the following Equation 1, hybrid conductor.
[Equation 1]
0.1 A / {(X / 2) ² Π} ≤Y≤0.5 A / {(X / 2) ² Π}
In Equation 1,
A is the nominal cross-sectional area (mm2) of the hybrid conductor,
X is the diameter of the element wire (mm). The method according to claim 1 or 2,
The hybrid conductor comprises a plurality of copper-clad aluminum wires,
The plurality of copper-clad aluminum wires may be mirror symmetrically or rotationally symmetrically based on a straight line passing through the center of a center wire disposed at the center of the plurality of wires constituting the hybrid conductor. The hybrid conductor characterized by the above-mentioned. The method of claim 3,
At the time when the conductor is broken while applying a load at a rate of 100 mm / min from the top at an intermediate point between the two spaced apart points, while supporting the lower ends of the hybrid conductors at two 200 mm spaced points from each other, respectively. The applied conductor is a hybrid conductor, characterized in that the wire diameter, the number of wires and the total diameter of the hybrid conductor is equal to or less than 85% of the load measured by the same method as above for a conductor made of only copper (Cu) wire. The method of claim 3,
The hybrid conductor includes two or more element wire layers formed by a plurality of element wires disposed around the center element wire,
Said copper-clad aluminum wire is arrange | positioned at the element wire layer except the outermost layer arrange | positioned at the outermost part of the said element wire layer, The hybrid conductor. The method of claim 5,
The number of element wires included in the n layer among the element wire layers is na,
The a is a hybrid conductor, characterized in that the number of the strands included in one layer of the strands layer. The method of claim 6,
The diameter of the element wire is 0.3 to 3.3 mm, characterized in that the hybrid conductor. The method according to claim 1 or 2,
The copper element wire has a copper (Cu) purity of 99.9% by weight or more, and the total content of impurities excluding silver (Ag) and oxygen (O) is 100 ppm or less, hybrid conductor. The method according to claim 1 or 2,
The aluminum center line has a purity of aluminum (Al) of at least 99.5% by weight, and the total content of the alloying elements except aluminum is 0.5% by weight or less, hybrid conductor.

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