KR20180017873A - Power cable having flexible sectoral conductors - Google Patents

Abstract

The present invention relates to a power cable including a flexible sector conductor, capable of implementing the sector conductor with flexibility, and firmly maintaining a sector shape of the sector conductor and securing the flexibility when the power cable applying the flexible sector conductor is manufactured. To this end, according to the present invention, in the power cable (100) including one or a plurality of sector conductors (110), the sector conductor (110) includes an inner layer (111) composed of a first type conductor and an edge layer (112) composed of a second type conductor. The first type conductor and the second type conductor are different kinds of conductors with a different material and/or wire shape.

Description

[0001] Power cable having flexible sectoral conductors [

The present invention relates to a power cable having a flexible sector conductor, and more particularly, to a power cable capable of securing the shape of a sector conductor while maintaining flexibility, And more particularly, to a power cable having a flexible sector conductor capable of being manufactured without replacement of equipment and improving workability.

Generally, the power cable includes a conductor that serves as a conduit for electrical current flow in the cable and an insulating layer that surrounds it. The conductors of these cables are metric sizes in IEC 60228 and BS 6360 and metric sizes in AWG Gage) as shown in Table 1 below.

Conductor classification IEC60228 BS6360 ASTM Break conductor
(solid conductor) class 1 class 1 class A Stranded conductor
(stranded conductors) class 2 class 2 class B, C, D Flexible conductor
(flexible conductors) class 5 class 5 class I, K Flexible reinforced conductor
(more flexible conductors) class 6 class 6 class M Division unit Metric Metric Circular Mil

The shape of a conductor can be divided into a round conductor and a sector conductor.

Circular conductors consist of concentric conductors, which are spirally twisted conductors in the course of twisted conductors, and compacted conductors and compacted conductors, which are reduced in diameter by minimizing the gap between the wires by mechanical compression during conductor twisting. conductor.

Sector conductors are manufactured in a fan shape by crimping a circular conductor in a multi-core cable having two or more cores, and the gap between the wire rods can be reduced in the course of joining the circular conductors.

Therefore, in the case of a cable using a sector conductor (hereinafter, referred to as a "sector cable"; see FIG. 1B), not only an additional packing for filling the gap is required but also, (Hereinafter, referred to as a 'circular cable') using a circular conductor such as a bar, the diameter of the cable can be reduced. Therefore, even if the cover or metal sheath is covered with the same thickness as that of the circular cable The weight of the coating or metal sheath required for the actual sector cable can be lower than that of the circular cable, which makes it possible to manufacture lightweight and reduce the cost. For example, two circular cables of different sizes (3C × 70 mm ² , 3C x 120 mm < ² >), the diameter reduction and the weight saving effect of each sector cable of the corresponding size are as shown in Table 2 below.

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Overall diameter (mm) Weight (kg) class 2 sector % class 2 sector % 3C × 70 mm ² 32.2 26.6 -17.3 2.38 2.21 -7.1 3C × 120 mm ² 40.6 33.0 -18.7 4.03 3.73 -7.4

The reduction of the diameter of the sector cable and the weight saving effect are mainly applied to the onshore cable because it can reduce the cost compared with the circular cable in terms of the cost in installation of the cable.

However, such a sector cable has a disadvantage in that its use is limited in a narrow space such as a ship due to lack of flexibility.

Table 3 below shows the results of a relative comparison test for each item, assuming cable laying through several bend points using circular cables of the same size and sector cables, respectively.

Test Items HIS SECTOR Ratio (%) Overall Diameter 36.8mm 29.8mm -19.0% weight 2880kg / km 2462kg / km -14.5% traction 61.2kg 79.6kg 30% Frictional resistance 2.12 3.24 52%

As shown in Table 3, it can be seen that a sector cable requires a greater than 30% pulling force required for cable movement than a circular cable due to lack of flexibility.

On the other hand, since the sector conductor rotates at a predetermined interval, the extruder head in which the insulator is produced during the manufacture of the sector cable can be extruded into a shape having a certain thickness only when it is rotated together with the same cycle as the rotation of the conductor. It is practically impossible to extrude a compound of a rubber-like material onto a rotating sector-shaped conductor to a certain thickness. Therefore, such a sector cable has many limitations on the selection of an insulator, and a sector cable insulator currently used in the market is a compound having plastic properties For example, crosslinked polyethylene (XLPE) is used.

However, such cross-linked polyethylene (XLPE) and the like have disadvantages in that they are not environmentally friendly since the resin can not be recycled if the lifetime of the cable is short,

In this connection, Korean Patent Laid-Open No. 10-2015-0108962 (published on October 1, 2015; hereinafter referred to as "Patent Document 1") discloses a technology relating to a sector cable.

According to Patent Document 1, it is possible to achieve weight reduction while reducing the outer diameter of the cable, to perform sector insulation without shrinking or punching, and to reduce the manufacturing cost while maintaining the resistance performance of the conductor. However, The flexibility of the sector cable was not improved.

Further, in the cable manufacturing process, the shape of the sector-shaped conductor must remain unbroken until the next insulating process, but in reality, the conductor is wound on the moving drum while being laid down under the process of being stacked The sector conductors are out of shape and can not have a sector shape in the next insulation operation.

Because of this problem, the sector conductor must be reflected in the layout of the factory so that the insulating work can be performed in the same process as the machining operation of the conductor. Therefore, in order to process the sector conductor, There was a problem to be done.

KR 10-2015-0108962 A 2015.10.01 public

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a sector conductor having improved flexibility compared to a conventional sector conductor, and a method of manufacturing a power cable using a sector conductor, In the process of being wound on the transfer drum to be transferred to the insulation process for insulation of the sector conductor and laminated to the lower part of the transfer drum, the sector shape of the sector conductor can be maintained firmly without being disturbed, And to provide a power cable having a flexible sector conductor that can be manufactured without replacing equipment in a conventional factory facility in which conductor processing and insulation process layout are separated, thereby improving workability.

According to an aspect of the present invention, there is provided a power cable including one or more sector conductors, wherein the sector conductors include a first layer of a first kind of conductor and a second layer of a second type of conductor, , And the first type conductor and the second type conductor are different types of conductors having different materials and / or shapes of wires.

The power cable having the flexible sector conductor according to an embodiment of the present invention may further comprise an insulating layer which surrounds and covers the outer side of each sector conductor with a constant thickness, Further comprising a combined layer for joining the surrounded sector conductors so that the associated shapes are circular in cross section while compressing and binding the radial portions of the neighboring sector conductors so as to be in surface contact to the center of the circle, And may further comprise a metal shielding layer which surrounds the outer side of the associated layer so as to constitute another embodiment.

The power cable having the flexible sector conductor according to each of the embodiments of the present invention includes an inner sheath layer surrounding the conductor layer or the insulating layer or the associated layer or metal shielding layer, a metal sheath layer surrounding the inner sheath layer, And an outer sheath layer surrounding the outer surface of the metal sheath layer.

Further, in the power cable having the flexible sector conductor according to each of the embodiments of the present invention, each sector conductor is composed of a first layer conductor formed by collectively stranding a plurality of first type conductors, and a second type conductor different from the first type conductor And a rim layer formed so as to surround the outermost layer of the first strand and to finish the shape of the stranded strand. In addition, each sector conductor may be formed such that the second strand forming the rim layer is covered And a separating coating layer surrounding the outer edge of the rim layer in order to block the adhering to the insulator to be made.

According to the present invention, it is possible to manufacture a sector conductor having improved flexibility by using a sector conductor having a top layer made of a heterogeneous conductor and a rim layer. In the manufacturing of a power cable employing a sector conductor, It is possible to manufacture without replacing equipment or layout even in existing factory facilities in which the conductor machining process and the layout of the insulation process are separated from each other, thereby improving work productivity.

1 (a) and 1 (b) are cross-sectional views each illustrating a state of insulation coupling between a circular conductor and a sector conductor according to the prior art.
2 is a cross-sectional view of a power cable having a flexible sector conductor according to an embodiment of the present invention.
3 is a cross-sectional view of a power cable having a flexible sector conductor according to another embodiment of the present invention.
4 (a) and 4 (b) are cross-sectional views illustrating, by extracting, respectively, a circular conductor before the change in shape before compression and a sector conductor after change in shape by compression in a power cable having the flexible sector conductor according to the present invention.

The overall structure and operation of a power cable having a flexible sector conductor according to the present invention will be described below in detail with reference to the accompanying drawings.

It is to be understood that the words or words used in the present specification and claims are not to be construed in a conventional or dictionary sense and that the inventor can properly define the concept of a term in order to describe its invention in the best possible way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention. Therefore, it should be understood that the embodiments described herein and the configurations shown in the drawings are only the most preferred embodiments of the present invention, and that various equivalents and modifications may be substituted for them at the time of the present application shall.

FIG. 2 is a cross-sectional view of a power cable having a flexible sector conductor according to an embodiment of the present invention, FIG. 3 is a cross-sectional view of a power cable having a flexible sector conductor according to another embodiment of the present invention, And (b) are cross-sectional views exemplifying a circular conductor before the change in shape before compression and a sector conductor after change in shape by compression, respectively, in the power cable having the flexible sector conductor according to the present invention.

2, the power cable 100 according to one embodiment of the present invention is constituted by a fast layer 111, a rim layer 112, and an insulating layer 114 formed of different kinds of conductors A combined layer 120 for binding together the sector conductors 110 of the conductor layer, wherein the one or more sector conductors 110 are radially arranged; A metal sheath layer 140 surrounding the outer sheath layer 130 surrounding the inner sheath layer 130 and an outer sheath layer 150 surrounding the outer surface of the metal sheath layer 140 have.

3, the power cable 100 according to another embodiment of the present invention includes a fast layer 111, a rim layer 112, a separating cover layer 113, and an insulating layer 113 formed of a different kind of conductor. A combined layer 120 for associating and binding each sector conductor 110 of a conductor layer with a plurality of sector conductors 110 made up of a layer 114 radially disposed thereon, An inner sheath layer 130 surrounding the outer side of the metal shielding layer 121, a metal sheath layer 140 surrounding the outer sheath layer 130, And an outer sheath layer 150 surrounding the outer covering layer 140.

In each of the embodiments, the sector conductor 110 includes a fast layer 111 and a rim layer 112, which are spirally twisted together with a constant pitch and formed of a heterogeneous conductor, can be processed into a sector shape as illustrated in Figure 4 (b) by deforming the shape by compression after it is formed into a circular conductor by the fast layer 111 and the rim layer 112 as illustrated in Figure 4 (a) .

Each of these sector conductors 110 may embody an embodiment in a configuration including a fast layer 111 and a border layer 112 as illustrated in FIG. 2 and an insulating layer 114 surrounding the periphery of the border layer. have.

3, each of the sector conductors 110 includes a fast layer 111 and a rim layer 112, a separating covering layer 113 surrounding the rim of the rim 112, and a separating covering layer 113 And an insulating layer 114 that surrounds and covers the outer side with a constant thickness.

The first layer 111 is formed by collectively stranding a plurality of first type conductors. The first class conductor is composed of conductor classes class 5 or 6 as specified in IEC 60228 and BS 6360 or twisted conductors as specified in ASTM class I, K or M conductor class.

The edge layer 112 is formed of a second type conductor different from the first type conductor and is formed so as to close the shape of the superfine layer constituting the first layer 111 by surrounding the outermost layer of the first layer 111. Where the second class conductor consists of a conductor class 2 specified in IEC 60228 and BS 6360, or a twisted wire specified in class B specified in ASTM.

Accordingly, the sector conductor of the present invention includes a first layer 111 made of a first type conductor and a second layer made of a second type conductor, and the first type and the second type have different materials or wire shapes , The material and wire shape are different from each other, and the diameter of the first type conductor is significantly smaller than the diameter of the second type conductor.

The separating coating layer 113 is formed to prevent the second type conductor forming the rim layer 112 from adhering to the insulator to be coated in the next step. The separating covering layer 113 is formed on the outer side of the rim layer 112 So as to be enclosed as a whole.

The insulating layer 114 may be a single layer made of one material, or a double-layered insulating coating made of two different materials. The insulating layer 114 may be made of polyvinylchloride (PVD). PVC, polyvinyl chloride / nylon (ethylene / propylene rubber), cross-linked polyethylene (XLPE), low-smoke halogenated ethylene propylene rubber (low-smoke, halogen (LSEPR), low-smoke halogen-free cross-linked polyolefin (LSXLPO), low-smoke halogen-free silicone rubber (LS silicone) A silicone rubber (SR), a cross-linked polyolefin (XLPO), or the like.

The combined layer 120 in the power cable 100 according to each embodiment of the present invention is also characterized in that each sector conductor 110 surrounded by the insulating layer 114 is radially arranged and associated so that its associated shape has a circular cross- The metal shielding layer 120 is formed on the outer side of the associated layer 120 so as to cover the periphery of the associated layer 120 as a whole, (121) may be formed.

Such a combined layer 120 may be spirally twisted with a plurality of insulated sector conductors to have a constant pitch and to have a circular cross-sectional shape, and if necessary, after the coupling, the tape may be wound appropriately to form one or more tape layers .

The metal shielding layer 121 is preferably composed of one or more layers selected from a tape layer, a braided or concentric wire layer, and a combination layer of wire and tape.

The inner sheath layer 130 of the power cable 100 according to each embodiment of the present invention is formed so as to surround the outer surface of the associated layer 120 or the metal shield layer 121, A metal sheath layer 140 surrounding the outer side of the metal sheath layer 140 and an outer sheath layer 150 surrounding the outer side of the metal sheath layer 140 may be formed in order.

The inner sheath layer 130 may be formed by extruding and coating or overlapping the inner sheath layer 130 or the metal shielding layer 121 to a predetermined thickness, , Halogen free thermosetting resins, halogen free thermoplastic resins, chlorosulphonated polyethylene (CSP), polychloroprene rubber (CR), chlorinated polyethylene rubber (CPE), silicone rubber (SR) It is preferable that it is made of any one material.

The metal sheath coating layer 140 may be formed of any one of a circular wire material, a square wire material, a double tape, and a metal braided layer.

When the metal sheath layer 140 is formed of a circular wire or a flat wire, it may be made of any one material selected from galvanized metal, copper, tinned copper, aluminum and aluminum alloy.

When the metal sheath layer 140 is formed of a double tape, it may be made of any one material selected from a steel sheet, a galvanized steel sheet, aluminum, and an aluminum alloy.

When the metal sheath layer 140 is formed of a metal braided layer, it may be made of any one material selected from galvanized steel wire braiding and copper braiding.

The outer sheath layer 150 is extruded and covered with a predetermined thickness on the metal sheath coating layer 140. Here, the outer sheath layer 150 may be formed of a material selected from the group consisting of polyvinyl chloride (PVC), halogen free thermosetting resin, halogen free thermoplastic resin, chlorosulfonated polyethylene rubber (CSP), chloroprene rubber (CR), chlorinated polyethylene rubber (CPE) SR). ≪ / RTI >

The manufacturing and operation effects of the power cable having the flexible sector conductor according to the present invention constructed as described above will be described below.

First, the first layer 111 of the sector conductor 110 is a first class conductor, conductor class 5 or 6 as specified in IEC 60228 and BS 6360, or conductor class I, K or M as defined in ASTM Wire in a multi-wire form. Thus, the flux layer 111 has the form of flexible conductors or more flexible conductors of Table 1 and is characterized by improved solubility over conventional sector conductors.

Then, as the second type conductor different from the first type conductor, conductor type class 2 specified by IEC 60228 and BS 6360, or class B specified by ASTM, and the stranded conductors of Table 1 And is arranged so as to enclose the outermost periphery of the first layer 111 as a whole to form a circular shape having a first layer 111 made of a first type conductor and a second layer 112 made of a second type conductor, The conductor can be formed as illustrated in Fig. 4 (a).

As shown in FIG. 4 (b), the shape of the circular conductor thus formed is compressed into a sector (sector) shape, and a rim layer 112 is formed on the outer peripheral surface of the sector- It is possible to further form the separation coating layer 113 which surrounds the outer side of the rim layer 112 if necessary so that the second type conductor forming the insulation layer can be prevented from adhering to the insulator to be coated in the next process.

Next, each of the sector conductors 110 is covered with a single layer made of one material or a two-layered insulator made of two different materials, and the insulating layer 114 is formed with a certain thickness.

When the insulator is coated, the sector conductors 110 surrounded by the insulating layer 114 are radially and cooperatively arranged so that the radius of each sector conductor 110, which is adjacent to each other, To the center of the circle so as to form the associated layer 120 outside the plurality of spirally twisted sector conductors 110 with a constant pitch. This allows a plurality of sector conductors 110 to form a conductor layer that constitutes the associated cable.

One or two or more tape layers, a braided or concentric wire layer, and a combination layer of a wire material and a tape may be provided on the outside of the associated layer 120, as necessary, to cover the outer side of the associated layer 120. [ Layer 121 may be formed.

When the formation of the conductor layer of the power cable is completed by the plurality of sector conductors 110, the inner and outer layers 111 and 112 of the sector conductor 110 are divided into different kinds of conductors Since the sector conductor 110 is primarily formed, the sector conductors 110 are wound on the transfer drum to be transferred to the insulation process in the conductor machining process, and are stacked on the lower portion of the transfer drum, so that the sector shape of the sector conductor is not disturbed, So that flexibility can be ensured.

Thereafter, the inner sheath layer 130, which is extruded and overlapped with or overlapped with the outer layer of the associated layer 120 or the metal shielding layer 121 to have a constant thickness, the circular wire material or the square wire material, The metal sheathing layer 140 formed in one piece and the outer sheathing layer 150 extruded and coated in a predetermined thickness can be formed in order.

According to the present invention, since the sector conductor can maintain its shape in the process of transferring and stacking in the process of manufacturing the power cable, it can be manufactured without replacing the existing equipment where the conductor processing process and the layout of the insulation process are separated. And the flexibility of the sector conductor can be overcome by limiting the use of the sector conductor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof fall within the scope of the present invention.

100: power cable 110: sector conductor
111: fast layer 112: rim layer
113: separating coating layer 114: insulating layer
120: Associated layer 121: Metal shielding layer
130: inner sheath layer 140: metal sheath layer
150: outer sheath layer

Claims (12)

1. A power cable (100) comprising one or more sector conductors (110)
The sector conductor (110)
And a rim layer (111) made of a first type conductor and a rim layer (112) made of a second type conductor,
Wherein the first type conductor and the second type conductor are different in shape or material from each other or have different materials and wire shapes. The method according to claim 1,
Wherein the diameter of the first type conductor is smaller than the diameter of the second type conductor. The method of claim 1, wherein the sector conductor (110)
(112) to produce a sector shape. ≪ RTI ID = 0.0 > 11. < / RTI > The method according to claim 1, wherein the velocity layer (111)
Wherein the flexible sector conductor is formed of a multi-wire. The method of claim 1, wherein the rim layer (112)
Wherein the flexible cable is constructed in the form of stranded conductors. The method according to claim 1, wherein the velocity layer (111)
A conductor class class 5 or 6 as defined by IEC 60228 and BS 6360, or a conductor class class I, K or M as defined in ASTM. The method of claim 1, wherein the rim layer (1121)
A conductor class 2 specified by IEC 60228 and BS 6360, or a line according to class B specified by ASTM. The method of claim 1, wherein the sector conductor (110)
Further comprising an insulating layer (114) that surrounds and covers the outside of each sector conductor (110). 9. The method of claim 8, wherein the sector conductor (110)
Further comprising a separate coating layer (113) positioned between the rim layer (112) and the insulating layer (114) and surrounding the rim layer (112). 10. The power cable (100) according to any one of claims 1 to 9,
≪ / RTI > further comprising a combined layer (120) that binds and binds each sector conductor (110). 11. The method of claim 10, wherein the power cable (100)
An inner sheath layer 130 surrounding the outer surface of the combined layer 120;
A metallic sheath layer 140 surrounding the outer sheath layer 130; And
An outer sheath layer 150 surrounding the outer surface of the metal sheath layer 140; The power cable (100) according to claim 11, wherein the power cable (100)
Wherein a metal shield layer (121) is positioned between the associated layer (120) and the inner sheath layer (130).

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