KR101938007B1 - conductor, cable including the same and manufacturing method thereof - Google Patents
conductor, cable including the same and manufacturing method thereof Download PDFInfo
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- KR101938007B1 KR101938007B1 KR1020120038318A KR20120038318A KR101938007B1 KR 101938007 B1 KR101938007 B1 KR 101938007B1 KR 1020120038318 A KR1020120038318 A KR 1020120038318A KR 20120038318 A KR20120038318 A KR 20120038318A KR 101938007 B1 KR101938007 B1 KR 101938007B1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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Abstract
A conductor, a cable including the same, and a manufacturing method thereof are disclosed. The conductor, the cable including the same, and the method of manufacturing the same according to the embodiments of the present invention exhibit stable electrical and mechanical characteristics and can secure the tensile strength of each element wire for achieving an optimal bonding force when the terminal is connected. The weight is made lighter than the conductor made of the wire alone, and the flexibility is improved, so that the ease of transportation and installation work can be achieved.
Description
The present invention relates to a conductor, a cable including the conductor, and a method of manufacturing the same. More particularly, the present invention can secure the ease of transportation and installation work by reducing weight and prevent corrosion due to contact between dissimilar metals during terminal connection A cable including the same, and a method of manufacturing the same.
Due to the recent rise in international copper prices and the rise in raw material prices, the cost of purchasing copper, which is the main material of cable conductors, has increased so much that copper has been replaced with copper in terms of price and performance There is an increasing need for this.
The biggest problem in the development of alternative materials is that it is difficult to obtain a material having electrical properties equivalent to copper, yet having sufficient mechanical and physical properties to be used as cable conductors.
In the development of materials for cable conductors, electrical characteristics, physical characteristics, and connection related characteristics are the criteria for product design. Researches are underway to develop materials that satisfy these requirements and to apply cables for existing materials.
In particular, the electrical properties of materials are generally proportional to the electrical properties of the materials, and therefore the substitutable materials tend to have lower electrical properties compared to copper at lower cost, high.
Normally, materials used for cable conductors are limited to copper, aluminum, silver or alloys with high conductivity. Other materials are significantly lower in electrical properties than the above-mentioned materials, and even if they have excellent electrical properties, Is too high to be used as an industrial cable material.
Copper, which has been used most often as a cable conductor, has long been used as a main material due to its high electrical conductivity and low cost, which are optimal conditions for cable conductor materials.
However, as the price of copper has risen more than three times as a result of the rise in the price of raw materials, research on the use of low-cost aluminum as a conductor material has been continuing.
However, when aluminum is used as a cable conductor, there is a problem that it has a lower electrical characteristic than copper, a problem of generation of an oxide film which hinders electric conduction due to a rapid reaction speed, a problem caused by a relatively large amount of heat compared to copper, It is faced with the problem that the sectional area becomes larger when the cable conductor is used as compared with copper.
Aluminum alloys have similar problems, so an alternative to this is the copper clad aluminum wire (CCA), which is a wire rod wrapped around a copper strip.
The electrical properties of copper alloy wire are located between the characteristics of copper and aluminum and have been studied as an alternative to copper as a composite material because there is no oxide film generation problem, which is one of the biggest problems in aluminum application.
Particularly, when a copper conductor is applied to a power cable used for a wind tower, the electrical characteristic is excellent but the specific gravity (ρ = 8.9 g / cm 3) is heavy and the price is high. (ρ = 2.7 g / cm 3) is relatively inexpensive, but the contact resistance increases due to the oxide film (Al 2 O 3) formed on the surface, so that it is difficult to ensure reliability in terminal connection. Therefore, it is preferable to apply the copper aluminum wire .
However, the above-mentioned electric power cables must have high flexibility for ease of operation when installed in a wind tower, exhibit stable mechanical characteristics when mounted in a tower, and also have an optimum fixing force when the cable is connected to a terminal The tensile strength of each wire should be secured.
Accordingly, there is a need for a conductor and a cable which can optimize the ratio of aluminum and copper in the copper alloy wire rod and exert the optimum fastening force while suppressing corrosion and heat generation due to connection between dissimilar metals at the time of terminal connection.
Embodiments of the present invention are intended to provide a conductor and a cable capable of exhibiting stable electrical and mechanical characteristics and securing a tensile strength of each elementary wire to have an optimal fixing force when a terminal is connected.
In addition, it is aimed to reduce the cost of the entire cable through cost reduction by reducing the material cost of the conductor made of copper wire only.
In addition, the weight of the conductor made of the copper wire alone is made lighter and the flexibility is improved to achieve the convenience of transportation and installation work.
According to an aspect of the present invention, there is provided an electronic device comprising at least one first wire made of aluminum or an aluminum alloy, an outer wire made of aluminum or an aluminum alloy, and an outer wire made of copper surrounding the extension, To 25%, and the second wire is disposed on the outermost layer of the aggregate in which the first wire and the second wire are stranded.
The conductor may be used as the center conductor of the cable for the wind tower.
Here, the minimum number of the second wires may be 18, and the total number of the first wires and the second wires may be 34 to 38.
The tensile strength of the aluminum or aluminum alloy may be 80 MPa to 200 MPa.
On the other hand, the aluminum alloy includes compositional elements and impurities of AL (aluminum), Fe (iron), Cu (copper), Mg (magnesium), Si (silicon)
The content (weight%) of the constituent elements constituting the aluminum alloy can satisfy the following equations (1) and (2).
[Equation 1]
97.42 (wt.%)??? 99.8 (wt.%)
0.05 (% by weight)? Fe? 1.0 (% by weight)
0.05 (% by weight)? Cu? 1.0 (% by weight)
0.04 (% by weight)? Mg? 1.0 (% by weight)
0.001 (% by weight)? Si? 0.03 (% by weight)
0.001 (% by weight)? Zn? 0.04 (% by weight)
0.008 (wt.%)? Other (impurities)? 0.03 (wt.%)
0.15 (% by weight)? Fe + Cu? 1.5 (% by weight)
0.002 (% by weight)? Si + Zn? 0.05 (% by weight)
0.15 (% by weight)? Fe + Mg? 1.5 (% by weight)
&Quot; (2) "
0.15 (wt%)? Fe + Cu + Mg + Si + Zn + other (impurities)? 3.1 (wt%
The aggregate in which the first and second wire materials are stranded can be compressed through the compression dice, and only the second wire material of the outermost layer constituting the aggregate can be compressed during the compression.
According to another aspect of the present invention, there is provided an aluminum alloy or aluminum alloy wire rod made of stranded aluminum or aluminum alloy wire and stranded aluminum or stranded aluminum alloy wire stranded to prevent corrosion due to contact between dissimilar metals during terminal connection. A cable including a conductor disposed in the outermost layer, an insulating layer for insulating the conductor, and a sheath layer for protecting the internal structure outside the insulating layer may be provided.
Here, the cross sectional area ratio of copper contained in the copper aluminum or copper alloy aluminum wire may be 20% to 25%.
According to still another aspect of the present invention, there is provided a method of manufacturing a semiconductor device, comprising: a step of drawing a first wire made of aluminum or an aluminum alloy; and a step of welding a copper wire having an area ratio of 20% A step of forming a center conductor by twisting the plurality of first wire materials and the second wire material to form an insulating layer which insulates the center conductor; And forming a sheath layer for forming the sheath layer.
Here, the second wire may be disposed on the outermost layer of the center conductor.
Further, the step of cooling the heat generated during the copper strip welding may be further included.
Further, a center conductor heat treatment step for improving the flexibility of the center conductor may be further included.
The minimum number of the second wires included in the center conductor may be 18, and the total number of the first wires and the second wires included in the center conductor may be 34 to 38.
The embodiments of the present invention can provide a conductor and a cable that can exhibit stable electrical and mechanical characteristics and can secure the tensile strength of each element wire to have an optimal fixing force at terminal connection.
In addition, it can reduce the cost of the overall cable by reducing the material cost by reducing the cost of the conductor made of the copper wire only.
In addition, the weight of the conductor made of only the copper wire can be made lighter and the flexibility can be improved, so that the convenience of transportation and installation work can be achieved.
1 is a cross-sectional view showing a cross-sectional structure of a conductor according to an embodiment of the present invention;
FIG. 2 is a view illustrating a process of manufacturing a coarse aluminum wire according to an embodiment of the present invention.
3 is a view illustrating a process of manufacturing a conductor by twisting aluminum wire and copper wire according to an embodiment of the present invention
4 is an exemplary configuration showing an example in which a cable according to an embodiment of the present invention is applied to a wind tower
5 is a perspective view showing a configuration of a cable according to an embodiment of the present invention.
6 is a flowchart showing a process of manufacturing a cable according to an embodiment of the present invention
7 is a perspective view showing a state in which a wiring crimp terminal is coupled to a cable end according to an embodiment of the present invention.
8 is a configuration diagram illustrating a process of compressing a conductor according to an embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.
1 is a cross-sectional view illustrating a cross-sectional structure of a conductor according to an embodiment of the present invention.
1, a
As described above, the
The
The
A
In the embodiment shown in FIG. 1, the
That is, the number of wires constituting each layer may be changed in consideration of the outer diameter, tensile strength, and electrical conductivity of the entire cable, and the total number of wires constituting the
On the other hand, in order to improve the tensile load of the
First, for the preparation of the experiment, copper copper wire with different cross-sectional area ratio of copper coating was prepared fresh by φ3.4mm and stranding (1 + 6 + 12 + 18) . Here, the copper coverage area ratio of the copper aluminum wire rod was changed to 0 to 30%, and the aluminum copper wire rod was arranged from the outermost layer and twisted.
The specific examples and comparative examples are shown in [Table 1].
Lightweighting percentage (%), tensile load (kN), temperature rise of conductor and terminal (ΔT, ° C) were measured for Examples 1 to 6 and Comparative Examples 1 to 9 shown in Table 1, The rate is less than 45% of the copper conductor (2,986kg / km), the tensile load is more than 25kN, the conductor temperature rise is less than 60 ℃ and the terminal temperature rise is less than 50 ℃. The evaluation results are shown in [Table 2] Respectively.
When the cross-sectional area ratio of copper is 20% to 25% and the number of the
Generally, the smaller the number of the
Therefore, in order to obtain satisfactory results in all of the above four physical property values, the cross-sectional area ratio of copper should be 20% to 25%, and 18 or more
As a result, in order to secure the tensile strength of each elementary wire to have an optimal fixing force when connecting terminals, and to obtain satisfactory results in the amount of heat generation and light weighting, the proportion of aluminum and the copper as a core material and the number of wires need to be optimized And the optimum range is as shown in the above experimental data.
Hereinafter, a specific manufacturing process of a conductor and a cable according to an embodiment of the present invention will be described.
FIG. 2 is a view illustrating a process of manufacturing a coarse aluminum wire according to an embodiment of the present invention. FIG. 3 is a view illustrating a process of manufacturing a conductor by twisting an aluminum wire and a coarse aluminum wire according to an embodiment of the present invention. Fig. 4 is an exemplary configuration diagram showing an example in which a cable according to an embodiment of the present invention is applied to a wind tower. Fig. FIG. 5 is a perspective view showing the construction of a cable according to an embodiment of the present invention, and FIG. 6 is a flowchart illustrating a process of manufacturing a cable according to an embodiment of the present invention.
Referring to FIGS. 1 to 6, the
First, the
The copper
Specifically, in manufacturing the
As shown in FIG. 2, the
Here, the
Then, the heat generated when the
Thereafter, the
At this time, the
When a wire rod having a large diameter enters through the
The
Concretely, the six
After passing through the twisted wire dies 55, the twisted conductors are wound on a take-up
Thereafter, the seven stranded twisted strands are wound around the
After the
Although the
As described above, the
At this time, it is preferable that the content (% by weight) of the composition element constituting the aluminum alloy satisfies the following equations (1) and (2).
[Equation 1]
97.42 (wt.%)??? 99.8 (wt.%)
0.05 (% by weight)? Fe? 1.0 (% by weight)
0.05 (% by weight)? Cu? 1.0 (% by weight)
0.04 (% by weight)? Mg? 1.0 (% by weight)
0.001 (% by weight)? Si? 0.03 (% by weight)
0.001 (% by weight)? Zn? 0.04 (% by weight)
0.008 (wt.%)? Other (impurities)? 0.03 (wt.%)
0.15 (% by weight)? Fe + Cu? 1.5 (% by weight)
0.002 (% by weight)? Si + Zn? 0.05 (% by weight)
0.15 (% by weight)? Fe + Mg? 1.5 (% by weight)
&Quot; (2) "
0.15 (wt%)? Fe + Cu + Mg + Si + Zn + other (impurities)? 3.1 (wt%
The basis for the derivation of these mathematical equations will be described with reference to the experimental data.
[Table 1]
As can be seen from the experimental data shown in Table 1 above, when the added content (% by weight) of Fe (iron) + Cu (copper) is 0.15 (% By weight) is 0.05 (% by weight) or more and 0.10 (% by weight) or less and the addition amount (% by weight) of Cu A satisfactory result with excellent tensile strength (mechanical strength) can be obtained.
When Fe (iron) + Cu (copper) content (weight%) is 1.00 (weight%), Fe %), And satisfactory results of excellent electrical conductivity and tensile strength (mechanical strength) are obtained when the content (% by weight) of Cu (copper) is not less than 0.95 Can be obtained.
When the addition amount (% by weight) of Fe (iron) is less than or equal to 1.00 (wt%) and 0.50 (weight%) when Fe (iron) + Cu %), And when the content (% by weight) of Cu (copper) is 0.50 (wt%) or more and 1.00 (wt%) or less, electric conductivity and tensile strength Can be obtained.
Therefore, in order to stably maintain both the tensile strength (mechanical strength) and the electric conductivity, the addition amount (wt%) of Fe and Cu and the addition amount (wt%) of Fe + Cu satisfy the above equations (1) and It is preferable to make it.
[Table 2]
On the other hand, when the addition amount (% by weight) of Fe (iron) + Mg (magnesium) is 0.15 (% by weight) (% By weight) is not less than 0.05 (by weight) and not more than 0.11 (by weight), and when the content (% by weight) of Mg (magnesium) is not more than 0.10 Satisfactory results with excellent conductivity and tensile strength (mechanical strength) can be obtained.
In addition, when the content (weight%) of Fe (iron) is 0.05 (weight%) or more and 0.96 (weight%) when the content (weight%) of Fe (iron) + Mg %), And when the content (% by weight) of Mg (magnesium) is not less than 0.95 (wt%) and not more than 0.04 (wt%), satisfactory results of excellent electrical conductivity and tensile strength Can be obtained.
When the added amount (weight%) of Fe (iron) is less than 1.00 (wt%) and 0.50 (weight%), %) Or more, and when the content (% by weight) of Mg (magnesium) is 0.50 (wt%) or more and 1.00 (wt%) or less, electric conductivity and tensile strength Can be obtained.
Therefore, in order to stably satisfy both the tensile strength (mechanical strength) and the electric conductivity, the addition amount (% by weight) of Fe and Mg and the addition amount (% by weight) of Fe + Mg satisfy the above- It is preferable to make it.
[Table 3]
[Graph 1]
[Graph 2]
[Graph 3]
As can be seen from the experimental data [Table 3] and [Graph 1] to [Graph 3] above, the addition amount (% by weight) of Si (silicon) is less than 0.001 (% by weight) Zinc) is less than 0.001 (% by weight), excellent electrical conductivity can be obtained but the tensile strength (mechanical strength) is not good.
When the added amount (% by weight) of Si (silicon) + Zn (zinc) is less than 0.002 (% by weight), excellent electrical conductivity can be obtained but the tensile strength (mechanical strength) is not good.
On the contrary, when the Si (silicon) content (wt.%) Exceeds 0.03 (wt%) or the Zn (zinc) content (wt.%) Exceeds 0.04 Strength) but the electrical conductivity is not good.
When the content (% by weight) of Si (silicon) + Zn (zinc) is more than 0.05 (% by weight), the electrical conductivity is poor.
Therefore, in order to stably satisfy both the tensile strength (mechanical strength) and the electric conductivity, it is preferable that the content (% by weight) of Si (silicon) and Zn (zinc) satisfy the
[Table 4]
[Graph 4]
[Graph 5]
Finally, as can be seen from the experimental data [Table 4], [Graph 4] and [Graph 5], the first region satisfying all of the tensile strength, elongation and electrical conductivity is expressed by Formula (Weight%) to 3.1 (weight%) or less of iron (Fe) + Cu (copper) + Mg (magnesium) + Si (silicon) + Zn .
For example, when the content (% by weight) of Fe (iron) + Cu (copper) + Mg (magnesium) + Si (silicon) + Zn (zinc) + other (impurities) is less than 0.15 (Weight%) of Fe (iron) + Cu (copper) + Mg (magnesium) + Si (silicon) + Zn (zinc) + other (impurities) ), It can be confirmed that the electrical conductivity and elongation are not good.
(Iron) + Cu (copper) + Mg (magnesium) + Si (silicon) + Zn (zinc) + other (impurity) content (wt%) as indicated by a more preferable secondary region in the primary region. ) Is adjusted to be not less than 0.15 (wt%) and not more than 2 (wt%).
As described above, based on the data shown in [Table 1] to [Table 4] and [Graph 1] to [Graph 5], the aluminum alloy wire rod has the content of each composition element exhibiting the preferable electric conductivity and tensile strength (Weight%), and the common denominator is summarized by the formula.
Therefore, the
In case of using such an aluminum alloy, there is a difference in the optimum bonding force between the cable and the terminal due to the difference in physical properties with the existing copper conductor. Therefore, the cross-sectional area ratio of copper in one wire is set to 20 to 25% The tensile strength of the core aluminum alloy was specified to be 80 to 200 MPa in order to secure the optimum fastening force and conductor tensile load.
On the other hand, the
Specifically, the
In particular, the
The structure of the wind tower is provided with a
A
The
The electric energy converted by the
Since the
As shown in FIG. 5, the
The insulating
The
Advantages of the case where the
7 is a perspective view showing a state in which a wiring crimp terminal is coupled to a cable end according to an embodiment of the present invention.
Referring to FIG. 7, in general, a power connection where a high-voltage three-phase power source is used uses a
The
When the exposed portion of the
The
As described above, in the
Therefore, when the
In addition, since an oxide film (Al2O3) is formed on the surface, which may occur when a conductor made only of an aluminum wire rod is used, the contact resistance is increased, so that it is possible to solve the problem that it is difficult to secure reliability in terminal connection.
8 is a configuration diagram illustrating a process of compressing a conductor according to an embodiment of the present invention.
Referring to FIG. 8, the
Here, in order to obtain a desired outer diameter, not only the outermost layer but also the inner layer adjacent to the outermost layer may be compressed.
Since the outer diameter of the
According to the
In addition, it is possible to reduce the cost of the overall cable by reducing the material cost by reducing the cost of the material made of the copper wire alone, and it is possible to achieve ease of transportation and installation work by lightening the weight and improving the flexibility.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.
1: first wire 10: copper wire aluminum wire
12: Ext. 14: External
20: conductor 100: cable
Claims (16)
At least one second wire having an outer wire made of aluminum or an aluminum alloy and an outer wire made of copper surrounding the inner wire, wherein the outer wire has a cross-sectional area ratio of 20% to 25%
The second wire is disposed on an outermost layer of the aggregate in which the first wire and the second wire are stranded,
Wherein the minimum number of the second wires is 18, and the total number of the first wires and the second wires is 34 to 38.
Wherein the conductor is used as a center conductor of a cable for a wind tower.
Wherein the aluminum or aluminum alloy has a tensile strength of 80 MPa to 200 MPa.
The aluminum alloy includes a compositional element and impurities of AL (aluminum), Fe (iron), Cu (copper), Mg (magnesium), Si (silicon), Zn (zinc)
Wherein the content (weight%) of the composition element constituting the aluminum alloy satisfies the following equations (1) and (2).
[Equation 1]
97.42 (wt.%)??? 99.8 (wt.%)
0.05 (% by weight)? Fe? 1.0 (% by weight)
0.05 (% by weight)? Cu? 1.0 (% by weight)
0.04 (% by weight)? Mg? 1.0 (% by weight)
0.001 (% by weight)? Si? 0.03 (% by weight)
0.001 (% by weight)? Zn? 0.04 (% by weight)
0.008 (wt.%)? Other (impurities)? 0.03 (wt.%)
0.15 (% by weight)? Fe + Cu? 1.5 (% by weight)
0.002 (% by weight)? Si + Zn? 0.05 (% by weight)
0.15 (% by weight)? Fe + Mg? 1.5 (% by weight)
&Quot; (2) "
0.15 (wt%)? Fe + Cu + Mg + Si + Zn + other (impurities)? 3.1 (wt%
And the aggregate in which the first wire rod and the second wire rod are stranded is compressed through the compression die.
And the second wire of the outermost layer constituting the aggregate is compressed during the compression.
An insulating layer for insulating the conductor; And
And a sheath layer for protecting the internal structure outside said insulating layer.
Welding a copper strip to the outer surface of the aluminum wire rod or aluminum alloy wire rod;
Drawing a second wire having a copper cross-sectional area ratio of 20% to 25%;
Twisting a plurality of the first wire materials and the second wire material to manufacture a center conductor;
Forming an insulating layer to insulate the center conductor; And
And forming a sheath layer outside the insulating layer to protect the internal structure.
And cooling the heat generated during the copper strip welding.
Further comprising a center conductor heat treatment step for improving the flexibility of the center conductor.
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KR102067125B1 (en) * | 2018-03-16 | 2020-01-16 | 넥쌍 | Flexible compact conductor |
KR101965345B1 (en) * | 2018-12-19 | 2019-04-03 | 주식회사 풍산 | Copper alloy for terminal and connector having excellent bending workability and method for manufacturing the same |
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JP2008159403A (en) * | 2006-12-25 | 2008-07-10 | Sumitomo Wiring Syst Ltd | Wire conductor, and insulated wire |
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KR101158018B1 (en) * | 2010-04-20 | 2012-06-25 | 오석환 | Copper clad aluminum wire and menufacturing method thereof |
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