KR20150108962A - sector cable - Google Patents

Abstract

Disclosed is a sector cable. According to an embodiment of the present invention, the sector cable can reduce an external diameter of a cable, reduce the weight thereof, and perform metal forming and isolating without having a peeled off or moved back surface. In addition, the manufacturing cost can be reduced as well as maintaining resistance of metal. The sector cable comprises: a plurality of conducting layers formed by weaving a plurality of stands composed of a copper covered aluminum wire rod; and a plurality of insulating layers for surrounding to individually insulate the conducting layers. Each of the conducting layers is compressed for a shape of the grouped conducting layers to form a circle shaped cross section. The stands forming the conducting layer are woven to have a center diameter pitch of 20 to 40 times.

Description

Sector cable {sector cable}

The present invention relates to a sector cable, and more particularly, to a sector cable capable of achieving weight reduction while reducing the outer diameter of a cable, performing sector insulation without surface shrinkage or pivoting, Cable.

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.

That is, in the development of the cable conductor material, whether or not the mechanical and physical characteristics have enough reliability to be used for the cable, while having a conductivity equal to or satisfactory to the copper, is the standard of the product design. Research is underway for cable applications.

Copper, which has been used mostly as a cable conductor material, has been used as a main material for a long time due to its high conductivity and low price which are optimal conditions for a cable material.

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, aluminum has a problem of not having low electric characteristics as compared with copper, and in particular, it is difficult to meet physical characteristics required for cables because of low elongation and strength. In the case of the aluminum alloy, although it exhibits physical characteristics similar to those of copper according to the alloy series, it has a problem that it is difficult to apply because the workability is reduced and the manufacturing cost is increased in the drawing process.

Also, when changing from conventional copper to aluminum conductor, aluminum should be connected by using a lug which is two times larger than the regular specification of copper, which is 1.27 times larger in size and conducts the same current.

For example, if 70SQ copper is replaced with aluminum, the cross-sectional area of the conductor is 116.97SQ. Therefore, it is necessary to use a lug of 125SQ, which is a conventional conductor size, and it is advantageous that it is lighter, but the cable installation space is 1.3 times larger. Therefore, replacing the old copper wire of the existing building with aluminum can not be replaced due to the duct size problem.

An alternative to this is the copper clad aluminum wire (CCA), which is a type of wire wrapped around an aluminum rod with a copper strip. The electrical properties of copper-coated aluminum wire are investigated as an alternative to copper as a composite material because they are located between the properties of copper and aluminum and can solve some of the low physical properties compared to copper, which is one of the biggest problems in aluminum application .

The properties of copper wire which is lower than copper when used as a cable material are largely determined by the electrical conductivity and mechanical properties, and the electrical properties can be solved by increasing the cross-sectional area by the resistance formula. In other words, copper wire has a larger wire resistance than copper, so that copper wire has a larger diameter than copper in order to have the same resistance. Therefore, considering the increase and decrease of the wire resistance and the outer diameter and the weight, the copper and aluminum alloy volume ratio of the wire used in the conductor should be carefully determined.

Further, when a copper conductor is manufactured by stranding the copper aluminum wire, the outer copper strip may be pushed or the wire surface may be shortened. In this case, the conductor resistance increases. Especially, due to the characteristics of copper wire with increased outer diameter, it is often used by compressing a conductor. However, when the wire passes through a die or roll to make a compressed shape, surface shrinkage or bending often occurs.

Accordingly, there is a need for a cable capable of achieving weight reduction while reducing the cable outer diameter, conducting conductor formation and insulation without surface shrinkage or pivoting, and reducing manufacturing cost while maintaining resistance performance have.

Embodiments of the present invention seek to reduce cable diameter and achieve weight reduction.

In addition, it is desirable to perform conductor molding and insulation without surface shrinkage or tipping.

It is also intended to provide a sector cable that can reduce the manufacturing cost while maintaining the resistance performance of the conductor.

According to one aspect of the present invention, there is provided a semiconductor device comprising: a plurality of conductor layers formed by stranding a plurality of strands of coaxial aluminum wire; and a plurality of insulating layers surrounding each of the plurality of conductor layers to insulate each of the conductor layers, Wherein a plurality of strands constituting the conductor layer are stranded so as to have a pitch of 20 to 40 times the layer thickness of the strand. have.

The sector cable according to the present invention may further include a center pillar disposed in contact with the inner circumferential surface of the plurality of insulating layers so as to fill the gap in the center of the cable.

The sector cable according to the present invention may further include an inner sheath layer surrounding the plurality of insulating layers.

The sector cable according to the present invention may further comprise a braid layer surrounding the inner sheath layer and performing at least one function of shielding, grounding or strength reinforcement.

The sector cable according to the present invention is provided outside the braided layer and may further include an outer sheath layer for protecting the internal structure.

Embodiments of the present invention can reduce the cable outer diameter and achieve weight reduction.

In addition, conductor molding and insulation can be performed without surface shrinking or pivoting.

In addition, it is possible to provide a sector cable capable of reducing the manufacturing cost while maintaining the resistance performance of the conductor.

1 is a view showing a process of manufacturing a coarse aluminum wire according to an embodiment of the present invention;
2 is a perspective view of a 4-sector cable according to an embodiment of the present invention.
3 is a cross-sectional view of a four-sector cable according to an embodiment of the present invention.
4 is a perspective view of a three-sector cable according to an embodiment of the present invention.
5 is a cross-sectional view of a three-sector cable according to an embodiment of the present invention.
Fig. 6 is a schematic view showing the layered core described in 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 view illustrating a process of manufacturing a coarse aluminum wire according to an embodiment of the present invention.

1, a coarse aluminum wire rod 10 according to an embodiment of the present invention may include an extension wire 12 made of an aluminum alloy and an outer wire 14 surrounding the extension wire and made of copper.

The coarse aluminum wire rod 10 may be made of aluminum alloy on the inner side and made of copper on the outer side. As shown in FIG. 1, a copper alloy wire rod 10 is manufactured by surrounding an outer wire 14 made of copper on an outer circumferential surface of an inner wire 12 made of an aluminum alloy and welding the outer wire 14.

Here, the extension 12 may be made of an aluminum alloy, and may be composed of a composition element of AL (aluminum), Fe (iron), Cu (copper), Mg (magnesium), Si (silicon) And other impurities.

The process for producing the aluminum alloy extensions 12 will be described in detail with reference to a process for producing the aluminum alloy extensions 12 using aluminum (Al), Fe (iron), Cu (copper), Mg (magnesium), Si (silicon) After the alloying material is prepared, it can be finished in a cold state to the desired shape and outer diameter.

As described above, the copper outer wire 14, that is, the copper strip, surrounding the extension wire 12 of the coarse aluminum wire rod 10 according to the embodiment of the present invention has the entire volume of the coarse aluminum wire rod 10 To 8% to 17% by weight.

1, a process of manufacturing the copper-clad aluminum wire 10 will be described in more detail. First, a rod made of an aluminum alloy is wrapped around an outer wire 14 made of a copper strip on an extension wire 12, Tungsten Inner Gas) welder (19).

More specifically, the welding is carried out in a welded part 17 which is shielded from the outside in the form of a box. Specifically, it is necessary to minimize the inflow of outside air, that is, oxygen, into the weld hole 17, and to minimize the outflow of argon (Ar) gas used for TIG welding.

At this time, the Ar gas is injected through the gas injector 18 so that the Ar gas is continuously filled therein. The reason why the Ar gas is supplied is to prevent the occurrence of excessive arc caused by oxygen during the TIG welding so as to achieve more stable welding and to ensure that the argon gas is filled in the flat copper aluminum wire 10 after the welding to be.

In addition, when oxygen flows into the aluminum alloy rod, oxidation occurs on the surface of the aluminum alloy rod and the copper strip, thereby delaying the cladding time, so that the welder's door 17 must be kept sealed.

Thereafter, the copper aluminum wire rod 10 is drawn through a repetitive process of passing through the fresh die 40, and a copper alloy wire rod 10 having a desired shape and diameter can be obtained through a drawing process.

At this time, the fresh die 40 is provided with a die case 43 in the form of a cylindrical body. Inside the die case 43, a die tip 45 Can be fixedly installed.

When a wire rod having a large diameter enters through the wire rod inlet 47 of the die tip 45 having the above structure, the wire rod having a thinner diameter comes out through the wire rod outlet 49, 10 can be made to have a desired shape and diameter, and the bonding strength between the extension 12 and the outer line 14 can be increased.

The coarse aluminum wire rod 10 obtained through drawing can obtain a material required by a heat treatment process. In the present invention, heat treatment can be performed by a continuous process.

The heat treatment method can be classified into various kinds according to the classification standard, and it can be classified into the continuous method and the fixed method depending on whether the material to be annealed is moved or not.

The continuous type is a method of adjusting the material by fixing the temperature and the passage time of the material, and it has a disadvantage of increasing the installation space, but it can easily satisfy the required physical characteristics. On the other hand, the batch method requires three steps of heating, holding, and cooling after charging the material, so it takes a long time and it is not easy to satisfy the physical characteristics.

In the present invention, a tubular furnace (50) is used. However, the heat treatment method is not limited thereto, and a copper alloy aluminum wire rod (10) can be manufactured by using another heat treatment machine.

Specifically, the heat treatment temperature according to the present invention can be performed at 220 to 560 ° C in order to remove the residual stress due to work hardening. The reason for the wide temperature range is that the heat treatment time And the small diameter of the coarse aluminum wire rod 10 also functions as a large variable, so that the heat treatment temperature is limited within a wide range as described above.

 After that, the aluminum wire rod 10 is cooled by air cooling and wound around the bobbin 60 to produce a coarse aluminum wire rod 10. The thus manufactured copper aluminum wire 10 according to the present invention can be applied to cables used in various fields.

FIG. 2 is a perspective view of a 4-sector cable according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of a 4-sector cable according to an embodiment of the present invention, FIG. FIG. 5 is a cross-sectional view of a 3-sector cable according to an embodiment of the present invention, and FIG. 6 is a diagram illustrating a layered core described in the present invention.

1 to 6, a sector cable 1000 according to an embodiment of the present invention includes a plurality of conductor layers 112 formed by stranding a plurality of strands of coarse aluminum wire 10, And a plurality of insulating layers 116 surrounding the conductor layers 112 so as to insulate the conductor layers 112. Each of the conductor layers 112 is compressed such that a plurality of conductor layers 112 are gathered, The plurality of elemental wires constituting the conductor layer 112 may be twisted to have a pitch of 20 to 40 times the layer thickness.

The conductor layer 112 may be formed by forming a plurality of strands of stranded aluminum wire 10 and then compressing the stranded strands so that each of the strands of the conductor layer 112 has a circular shape divided into a plurality of sectors Can be compressed. That is, as shown in FIGS. 2 to 5, each of the conductor layers 112 is compressed such that a plurality of conductor layers 112 are gathered to form a circular cross-section.

In the present invention, as compared with a cable made of a conventional copper conductor, the conductor layer 112 is made of CCA, that is, copper aluminum wire rod (10) and the structure of the conductor layer (112) is applied as a sector division structure.

The sector division structure may be configured as a four sector structure as shown in FIGS. 2 and 3 or a three sector structure as shown in FIGS. 4 and 5 as needed, and a two sector structure Or a multi-divided structure of 5 sectors or more.

An insulating layer 116 may be formed on the outer side of the conductor layer 112. The insulating layer 116 may be formed on the plurality of conductor layers 112 ), Respectively, so that a plurality of them can be formed. Here, the insulating layer 116 is made of a material having an insulating property and an impact resistance property, and covers and protects and insulates the conductive layer 112.

Specifically, the insulating layer 116 may be formed of a material selected from the group consisting of silicone, cross-linked polyethylene (XLPE), crosslinked polyolefin (XLPO), ethylene-propylene rubber (EPR) Polyvinyl chloride (PVC), or a mixture thereof.

As described above, the insulating layer 116 may be formed separately for each of the plurality of conductor layers 112. The conductor layer 112 divided into a plurality of conductor layers 112 may be formed to have a circular shape as a whole after the insulating layer 116 is formed. . At this time, the central pillar 20 may be additionally disposed at the central portion thereof so as to fill the central pore. That is, the center pillar 20 may be disposed in contact with the inner circumferential surface of the plurality of insulating layers 116 so as to fill the voids in the central portion of the sector cable 1000.

The inner sheath layer 130 may be provided on the outside of the plurality of conductor layers 112 and the insulating layer 116 arranged in a circular shape. The inner sheath layer 130 may be used for the purpose of protecting the conductor layer 112 inside the outer sheath layer 130 by absorbing an external impact, but it is not essential and may be omitted.

As the inner sheath layer 130, thermoplastic and thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene can be used.

A braided layer 140 may be provided on the outer side of the inner sheath layer 130. If the inner sheath layer 130 is omitted, the semi-finished product or the insulating layer 116 may be enclosed. The braided layer 140 surrounds the inner sheath layer 130 and may perform at least one of shielding, grounding, or strength reinforcement.

An outer sheath layer 150 is provided at the outermost portion of the sector cable 1000 to protect the sector cable 1000 from external impact or corrosion. Like the inner sheath layer 130, the outer sheath layer 150 can be made of thermoplastic or thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene. The outer sheath layer 150 is not essential and may be omitted.

Cable Construction Conductor weight
(kg / km) OD
(mm) material cost
(10,000 won / km) Material / Class Type
0.6 / 1kVF-TCOCO 3X70SQ

Cu Class 2 Circular strand Ref (2.912) Ref (37.2) Ref (1.926) CCA Class 2 Circular strand 14% ↓ (2.503) 15% ↑ (42.9) 33% ↓ (1.281) Compressed 15% ↓ (2.477) 13% ↑ (42.1) 34% ↓ (1.275) Compact 18% ↓ (2.377) 7% ↑ (39.7) 35% ↓ (1.251) Sector 22% ↓ (2.281) 2% ↓ (36.4) 36% ↓ (1.230)

Table 1 shows the results of designing and fabricating copper conductor, CCA circular wire, CCA compressed conductor and sector conductor for 0.6 / 1kV F-TCOCO 3X70SQ, and comparing the weight, outer diameter (OD) to be.

As can be seen from Table 1, the sector cable 1000 according to the present invention can be obtained by changing the conductor layer 112 from conventional copper to copper aluminum wire 10 so that the weight of the copper conductor is 63% It can be lightweight and can be lightened by about 22% when viewed from the whole cable.

Since the diameters to the junction are smaller than those of the existing three-stranded structure, the thickness of the bedding and sheath layers is the same, but the volume of the polymer material decreases due to the lowering of the diameter. Thus, the cost of the cable is reduced by 30 to 40% can confirm.

On the other hand, as shown in Table 1, when the copper conductor is changed to CCA, the weight and the material ratio are decreased, but the OD is larger than the sector structure.

Specifically, in the existing three stranded structure, when the copper is simply changed to the coarse aluminum wire 10, the size of the conductor is increased by 22% compared with the conventional one, and by the whole cable is increased by about 15%. This is because if you change the copper to CCA, the cable cost and weight may decrease. However, if the cable is past the end of the existing cable or tray, you have to change the pipe and the tray. The overall cost, including the cost, means no difference.

However, when the sector structure is applied to the conductor layer 112 as in the sector cable 1000 according to the present invention, the 3 sector structure is reduced by 2.3% as shown in Table 1. In the 2 sector structure, It is only about 1% larger than conventional copper conductor cable.

That is, even if the same CCA is applied, it can be seen that the size of the cable can be further reduced as compared with the compressed type and the compact type in which only the conductor is compressed while maintaining the same structure.

On the other hand, in order to reduce the outer diameter of the conductor layer 112 to which the CCA, that is, the copper aluminum wire 10 is applied, compression molding must be carried out without shrinking or pushing the surface of the conductor. Particularly, in order to form the conductor layer 112 of the sector cable 1000 according to the present invention, if a stranded strand is passed through a dice or roll just before insulation and a shape is formed, The surface of the copper strip is shrunken or shrunk, and in this case, the resistance performance is inferior.

That is, in the case of the conductor using the copper aluminum wire 10, unlike the conventional copper conductor, there is an aluminum conductor at the center of the conductor and a copper conductor at the outer side. When the copper conductor is compressed, It is highly possible that the resistance will increase.

To compensate for this, for example, if 15 vol% copper is used in the CCA round wire, it is necessary to use 20% CCA Cu at 9% outer diameter compression to satisfy the specification. Because of this problem, the cost of the conductor increases more than the material cost gain obtained by reducing the ground through the conductor compression, so that the economical effect of the compression conductor can be reduced.

However, in the sector cable 1000 according to the present invention, the strand constituting the conductor layer 112 is twisted so as to have a pitch of 20 to 40 times the layer thickness of the core layer (a). Here, the layer thicknesses (a) refer to the distances between the centers of the two outermost strands laid symmetrically with each other at the time of stranding, as shown in Fig.

Cable Construction Conductor Type Pitch
(Layered heart) Specification Resistance
(Ω / km) resistance
(Ω / km) OD
(mm) Cable Weight
(kg / km) 0.6 / 1kVF-TCOCO 3X70SQ CCA Class 2
Circular strand 18 times 0.281 ↓ 0.2590 42.9 2.503 CCA Class 2
Sector 18 times 0.2822 36.4 2.297 21 times 0.2627 2.281 30 times 0.2485 2.228 40 times 0.2363 2.201

As shown in Table 2, 18 times of the layer thickness (a), which is the conventional pitch range, was applied, and the circular conductor satisfies the conductor resistance criterion of IEC 60228, but it is not satisfied with the sector conductor. This is because when the pitch is short, the resistance of the conductor is increased while the conductor is insulated in the machining process, but the copper is scraped off the surface of the CCA.

In order to insulate the sector without shrinking the surface of the conductor or inserting the sector, it is necessary to increase the pitch between 20 times and 40 times as shown in Table 2 in which the pitch is 10 to 20 times of the layer thickness (a) do.

As the pitch is increased and the wires are twisted, the fluidity of the twisted wire is improved when the wire is changed to the sector shape at the time of insulation. However, if the pitch exceeds 40 times of the layer thickness (a), the conductor twist is loosened, so 40 times should be considered as the upper limit.

The sector cable according to the embodiments of the present invention described so far can reduce cable outer diameter, achieve weight reduction, and can perform conductor forming and insulation without surface shrinkage or pivoting. In addition, there is an advantage that the manufacturing cost can be lowered while maintaining the resistance performance of the conductor.

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.

10: copper wire aluminum wire 20: center pillar
112: conductor layer 116: insulating layer
130: Inner sheath layer 140: Braided layer
150: outer sheath layer 1000: sector cable

Claims (5)

A plurality of conductor layers formed by stranding a plurality of element wires made of copper aluminum wires; And
And a plurality of insulating layers surrounding the plurality of conductor layers to insulate each of the plurality of conductor layers,
Wherein each of the conductor layers is compressed such that a plurality of conductor layers are gathered in a circular cross section, and a plurality of element wires constituting the conductor layer are stranded so as to have a pitch of 20 to 40 times the layer core diameter. cable. The method according to claim 1,
And a center pillar disposed in contact with the inner circumferential surface of the plurality of insulating layers so as to fill the voids in the cable center portion. The method according to claim 1,
And an inner sheath layer surrounding the outer sides of the plurality of insulating layers. The method of claim 3,
Further comprising a braid layer surrounding the inner sheath layer for performing at least one of shielding, grounding or strength reinforcement. 5. The method of claim 4,
Further comprising an outer sheath layer disposed outside the braided layer for protecting the internal structure.

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