KR20160074721A

KR20160074721A - Submarine cable of improved out-of-roundness

Info

Publication number: KR20160074721A
Application number: KR1020140182397A
Authority: KR
Inventors: 김두연; 정순철
Original assignee: 엘에스전선 주식회사
Priority date: 2014-12-17
Filing date: 2014-12-17
Publication date: 2016-06-29

Abstract

A submarine cable having improved roundness according to the present invention includes a plurality of core portions for power transmission, an optical cable unit for optical communication, and an external protection portion for incorporating the core portion and the optical cable unit, And the optical fiber unit is disposed in a space between the core portion and the intervening member.
According to the present invention, it is possible to improve the roundness of the entire cable so that uniform bending stress acts on each region of the cable.
Further, the surface area of the cable for emitting heat generated from the cable is increased, so that the heat can be discharged smoothly, and the optical cable included in the cable can be physically protected from external force.

Description

{SUBMARINE CABLE OF IMPROVED OUT-OF-ROUNDNESS}

The present invention relates to a submarine cable, which improves the roundness of the entire cable to increase the surface area of the cable for emitting heat generated from the cable while making the bending stress uniform in each area of the cable, Which can be physically protected from an external force.

Submarine cables are cables that are attached to the seabed for communication, transmission, etc. between two isolated points, such as sea and land, continents and continents, land and islands.

Since the submarine cable is attached to the seabed, the cable is likely to be damaged by the anchor or fishing gear of the ship in areas where fishing activities are active, and the natural phenomena such as sea currents, sea breezes due to waves, In order to prevent the damage of the cable, an external cable is generally used.

The submarine cables are classified into two types depending on the area of installation. The cables are installed in a relatively sloping continental shelf area extending from the coast to the depths of about 500 m, and external cables are used. And the deep sea dragon is installed in the deep sea where the fishing activity is not active and the damage due to the natural phenomenon is relatively small. Therefore, the outer shell cable can be used.

The submarine cable is required to have mechanical strength, corrosion resistance and flexibility, as well as a watertightness characteristic capable of withstanding high seawater pressure, that is, a property capable of preventing penetration, absorption and permeation of seawater due to high seawater pressure.

Normally, the submarine cable is configured with a plurality of core portions including conductors and an optical fiber unit for optical communication disposed in the outer protective layer.

At this time, polypropylene yarns are interposed between the core unit and the optical cable unit to form a cross section of the cable including the core unit and the optical cable unit closer to a circle.

However, when a plurality of yarns are arranged inside the cable as described above, there is a problem that the yarns are caught in the equipment for joining when the cable is formed by combining the core parts with the optical cable unit and the yarns.

In order to solve such a problem, the number of yarns inserted into the cable has been reduced to cooperate with each other. However, due to the pressure applied during the process of forming the outer protective layer, the entire cross- Which causes a problem in that it is distorted.

As described above, when the cross section of the cable can not be circular, the load of the cable wound around the turntable after production is not uniformly distributed, and the cable is broken in the course of storage or transportation. The tensile force applied by the cable bending during the cable installation process is not uniformly applied to the entire cross section of the cable, and this phenomenon causes the cable to be damaged in a portion where a larger tensile force is applied during the long use of the cable.

As a prior art related to the submarine cable, Korean Patent Laid-Open No. 10-2009-0081806 (name of the invention: submarine cable) and the like are available.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a submarine cable with improved roundness, which is configured such that the roundness of the entire cable is improved and uniform bending stress is applied to each region of the cable.

It is still another object of the present invention to provide an undersea cable with improved roundness, which is configured to increase the surface area of a cable for emitting heat generated from the cable.

It is still another object of the present invention to provide an undersea cable having improved roundness, in which the optical cable included in the cable is arranged closer to the center of the cable.

It is still another object of the present invention to provide an undersea cable having improved roundness that is configured to physically protect an optical cable included in a cable from an external force.

According to an aspect of the present invention, there is provided a submarine cable having improved roundness, including a plurality of core units for power transmission, an optical fiber unit for optical communication, and an external protection unit for incorporating the core unit and the optical cable unit, An intervening member is disposed between the outer protective portion and the core portion, and the optical fiber unit is disposed in a space between the core portion and the intervening member.

Preferably, the interposer is formed in a circular cross-section, and a plurality of interposers formed with different cross-sectional diameters are disposed between the outer protective portion and the core portion.

Here, the intervening member may include a central intervening member and an auxiliary intervening member, and the diameter of the central intervening member may be greater than the diameter of the diminishing member.

Preferably, in the submarine cable, the center intervening two different central intervening members are arranged, and the first central intervening member is formed to have a larger diameter than the second central intervening member.

Also, in the submarine cable, the dichroic dichroic prism may be provided with two different dichroic materials, and the first dichroic material may be formed to have a diameter larger than that of the second auxiliary interiors.

Here, the second central interposer is disposed in the submarine cable, and the optical fiber unit can be disposed in the space between the pair of second central interposers and the core portion.

Here, the intervening member may be formed into a hollow cylindrical shape.

Preferably, a pair of second auxiliary interposers are disposed on the pair of second center-intervening side portions.

On the other hand, when the diameter of the first central intervening part is Dm1 and the diameter of the core part is Dc, Dm1 = 0.4827 X Dc ± 10 (%).

When the diameter of the first dunnage is Ds1 and the diameter of the core is Dc, Ds1 = 0.2372 X Dc ± 10 (%).

Dm2 = 0.353 X Dc 占 10 (%), where Dm2 is the diameter of the second central intervening part and Dc is the diameter of the core part.

When the diameter of the second dichroic mirror is Ds2 and the diameter of the core is Dc, Ds2 = 0.1846 X Dc ± 10 (%).

Preferably, the first centering gap is formed in a thickness range of 4.5 mm to 6.9 mm.

Also, the first dampers may have a thickness ranging from 3.0 mm to 4.7 mm.

Also, the second central intervening member may be formed in a thickness range of 3.5 mm to 5.7 mm.

In addition, the second dampers may have a thickness ranging from 2.4 mm to 4.1 mm.

Preferably, a spacer member is disposed in a space between the pair of second central interposers and the core portion.

The intervening connecting portion is coupled by a connecting member, and the connecting member includes a central portion and an engaging portion protruding from the central portion to both side portions. The engaging portion is formed with a fastening hole, And can be coupled by fastening pins.

According to the present invention, it is possible to improve the roundness of the entire cable so that uniform bending stress acts on each region of the cable.

In addition, the surface area of the cable for discharging the heat generated from the cable is increased, so that a smooth heat discharge can be achieved.

Further, the optical cable included in the cable is disposed closer to the center of the cable, thereby reducing the bending stress acting on the optical cable when the cable is installed.

Further, the optical cable included in the cable can be physically protected from external force.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a cross-sectional view of a submarine cable with improved roundness according to the present invention,
2 is a cross-sectional view of the submarine cable with a spacer member inserted therein,
3 is a cross-sectional view of the submarine cable in which another spacer member is inserted,
Figure 4 is a perspective view of the yarn inserted into the cable,
5 is a perspective view showing a state in which the interposition and the interposition are connected,
6 is a cross-sectional view of the intervening member,
7 is a cross-sectional photograph of a conventional submarine cable,
8 is a cross-sectional photograph of a submarine cable with improved roundness according to the present invention,
Figure 9 is another thermogram of an undersea cable cross section with improved roundness according to the present invention.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

Prior to this, the terms used in the specification and claims should not be construed in a dictionary sense, and the inventor may, on the principle that the concept of a term can be properly defined in order to explain its invention in the best way And should be construed in light of the meanings and concepts consistent with the technical idea of the present invention.

Therefore, the embodiments shown in the present specification and the drawings are only exemplary embodiments of the present invention, and not all of the technical ideas of the present invention are presented. Therefore, various equivalents It should be understood that water and variations may exist.

FIG. 1 is a cross-sectional view of a submarine cable having improved roundness according to the present invention, FIG. 2 is a cross-sectional view of the submarine cable in which a spacer member is inserted, FIG. 3 is another cross- FIG. 4 is a perspective view of a yarn inserted into the cable, FIG. 5 is a perspective view of the interposer and the interposer connected to each other, and FIG. 6 is a cross-sectional view of the interposer.

An undersea cable having improved roundness according to the present invention includes a plurality of core portions 10 for power transmission, an optical cable unit 20 for optical communication, and an outer portion 20 for incorporating the core portion 10 and the optical cable unit 20 And the optical fiber unit 20 is inserted into a space between the core unit 10 and the intervening member 70. The optical fiber unit 20 is inserted into the space between the core unit 10 and the intervening member 70, .

The core portion 10 includes a conductor 12, an inner semiconductive layer 13, an insulating layer 14, an outer semiconductive layer 15, and a sheath 16 as a configuration for power transmission.

The conductor 12 is located at the center of the core 10 and serves as a passage through which electric current flows. For example, the conductor 12 may be formed of copper or aluminum, and a plurality of circular wires are twisted.

However, since the surface of the conductor 12 is not smooth, the electric field may be uneven, and corona discharge tends to occur partially.

Further, when a gap is formed between the surface of the conductor 12 and the insulating layer 14 described later, the insulating performance may be deteriorated.

In order to solve the above problem, the outer surface of the conductor 12 is covered with a semiconductive material such as semiconductive carbon paper, and the layer formed by semiconductive material is defined as an inner semiconductive layer 13.

The inner semiconductive layer 13 makes the electric charge distribution on the conductive surface uniform so as to make the electric field uniform, thereby improving the dielectric strength of the insulating layer 14 described later.

Further, the formation of a gap between the conductor 12 and the insulating layer 14 is prevented to prevent corona discharge and ionization.

An insulating layer 14 is provided on the outside of the inner semiconductive layer 13. The insulating layer 14 electrically insulates the conductor 12 from the outside.

In general, the insulating layer 14 should have a high breakdown voltage, and the insulating performance must be stable for a long period of time.

Furthermore, it should have low dielectric loss and resistance to heat such as heat resistance. Therefore, polyolefin resin such as polyethylene and polypropylene is used for the insulating layer 14, and a polyethylene resin is preferable. The polyethylene resin may be a crosslinked resin.

On the other hand, if the outside of the insulating layer 14 is not shielded, a part of the electric field is absorbed by the insulating layer 14, but most of the electric field is discharged to the outside.

In this case, if the electric field becomes larger than a predetermined value, the insulating layer 14 and the sheath 16 may be damaged by the electric field. Therefore, a semiconductive layer is provided on the outer side of the insulating layer 14 and is defined as an outer semiconductive layer 15 to distinguish it from the inner semiconductive layer 13 described above.

As a result, the outer semiconductive layer 15 is grounded so that the distribution of the electric lines of force between the inner semiconductive layer 13 and the above-described inner semiconductive layer 13 becomes equal, thereby improving the dielectric strength of the insulating layer 14. [

In addition, the outer semiconductive layer 15 can smooth the surface of the insulating layer 14 in the cable, thereby alleviating the electric field concentration and preventing the corona discharge.

A shielding layer (not shown) made of a metallic sheath or a neutral wire is provided on the outside of the outer semiconductive layer 15 in accordance with the type of the cable. The shielding layer is provided for electrical shielding and short-circuit current return, and may prevent moisture from penetrating into the core.

A sheath 16 is provided at the outermost portion of the core 10. The sheath 16 is provided on the outermost layer of the core 10 to protect the internal structure of the core 10 and is generally made of polyvinyl chloride (PVC) or polyethylene (PE) So as to produce an outer skin.

The optical cable unit 20 is configured for data transmission and includes an optical fiber core wire and an outer sheath surrounding the fiber core wire.

The outer protective part may include a bed layer 30, an armor layer 40 and a serving layer 50 to protect the core 10 and the optical cable unit 20 and the like.

The bedding layer 30 and the serving layer 50 may be made of polypropylene yarn and the armor layer 40 may be made of steel for enhancing the mechanical strength so as to protect the core, Wire.

In the submarine cable according to the present invention, the interposer (60, 70) is disposed between the outer protective portion and the core portion (10).

As shown in FIG. 1, between the outer protective portion and the core portion 10, a first center spacer (not shown) having a hollow cylindrical cross section is formed. 60 are disposed.

A pair of first auxiliary interiors 65 each having a hollow cylindrical cross section is disposed on both sides of the first central intervention member 60.

Here, one of the first central grooves 60 is arranged to face the two core portions 10.

In addition, a pair of second centering members 70, which are also formed in a hollow cylindrical cross section, are disposed in a region between another core portion 10 and the outside protective portion in the submarine cable.

A pair of second auxiliary interposer (75) is disposed on both side portions of the pair of second central interposer (70).

The second centering member 70 has a diameter smaller than that of the first centering member 60 so that the first centering member 60 faces the core unit 10, The second centering member 70 is disposed so that the pair of second centering members 70 face the core unit 10. [

As described above, when the pair of second central interposer 70 is disposed so as to face the pair of core portions 10, one first central intervening member 60 is formed of a pair of core portions 10 A larger space can be secured between the interposing portion and the core portion as compared with the case where the interposing portion and the core portion are arranged to face each other.

Therefore, as described above, the optical cable unit 20 is disposed in the space of the portion where the pair of second core members 70 and the pair of core portions 10 face each other.

Thus, the optical cable unit 20 can be disposed closer to the center of the entire submarine cable.

When the optical cable unit 20 is disposed far from the center of the cable in the case where the submarine cable is wound in a bent state on the turntable or the cable is bent in the process of installing the submarine cable, A larger bending stress may be applied to the optical fiber unit 20 to cause breakage of the optical fiber unit included in the optical cable unit 20. [

Therefore, even when the optical fiber cable unit 20 is disposed between the core portion 10 having a large weight and the interposition member 70 having a very small weight as compared with the core portion 10 having a large weight, It is possible to prevent the optical fiber unit from being damaged by disposing the pair of core units 10 facing each other in a state in which the diameter of the optical fiber unit is smaller than the diameter of the optical fiber unit 60 and disposing the optical fiber unit 20 in a space therebetween.

1, the first central intervening member 60, the first auxiliary intervening member 65, the second central intervening member 70, and the second auxiliary intervening member 75 are provided outside the entire core unit 10, The space outside the core portion 10 can be filled with the interposing material so that the whole cable can be made closer to the circular shape.

On the other hand, a spacer member 27 as shown in Figs. 2 and 3 may be disposed in a space between the pair of second central interposer 70 and the core portion 10.

In addition, synthetic resin yarns as shown in FIG. 4 may be arranged in the space region 25 where the optical fiber unit 20 is disposed.

As a result, it is possible to prevent the second central intervening member 70 from moving toward the core portion 10 by the spacer member 27 or the synthetic resin yarn Yarn, thereby improving the roundness, A bending stress can be applied and the second central member 70 can be prevented from applying pressure to the optical cable unit 20. [

And also prevents the optical fiber unit 20 from moving toward the intervening members.

Here, the interposers 60, 65, 70, and 75 are configured to have a yield strength of 3.47 to 5.75 ton / m, respectively, so as to withstand the side pressure acting on the submarine cable, The core portion 10 and the optical cable unit 20 inside the cable can be effectively protected.

The intervening members 60, 65, 70 and 75 are formed in a hollow cylinder-shaped cross section, and the diameter of the central intervening members 60 and 70 is larger than the diameter of the auxiliary intervening members 65 and 75.

The first central intervention member 60 is formed to have a larger diameter than the second central intervention member 70 and the first auxiliary intervention member 65 is formed to have a larger diameter than the second auxiliary intervention member 75.

As shown in FIGS. 5 and 6, the interposers are formed in a pipe shape having a hollow cylindrical cross section. The diameter of the first central interposition member 60 is Dm1, the diameter of the core unit 10 is Dc Ds1 = 0.2372 X Dc ± 10 (%), where Dm1 = 0.4827 × Dc ± 10 (%) and the diameter of the first auxiliary interlayer 65 is Ds1.

Dm2 = 0.353 X Dc 占 10 (%), where Dm2 is the diameter of the second central intervening member 70, and Ds2 is the diameter of the second auxiliary intervening member 75, = 0.1846 X Dc 占 10 (%).

Thus, by arranging the intervening members 60, 65, 70, 75 outside the three core portions 10, the intervening members 60, 65, 70, 75 can be formed closer to the entire circle by the intervening members.

The first central intervening member 60 is formed to have a thickness ranging from 4.5 mm to 6.9 mm and the first auxiliary intervening member 65 has a thickness ranging from 3.0 mm to 4.7 mm.

The second central intervening member 70 is formed in a range of 3.5 mm to 5.7 mm thickness t and the second auxiliary intervening member 75 is formed in a range of 2.4 mm to 4.1 mm thickness t, HDPE or mHDPE is preferable as the material of the material, considering strength and production cost.

In the first central interposition 60, the first auxiliary interposition 65, the second central interposition 70 and the second auxiliary interposition 75, the larger diameter inclusions are thicker than the smaller diameter inclusions .

That is, in the case of inclusions having small diameters, since the side pressure acting on the submarine cable can withstand even if the thickness is smaller than that of the inclusions having a large diameter, the first central interposition 60, the second central interposition 70, The second center spacer 70 and the second central spacer 70 are formed in the order of the thickness, thereby reducing the production cost.

5, the connecting members 64 may be connected to each other by a hollow cylindrical central portion 67 and a connecting portion 64. In this case, And an engaging portion 68 protruding from the central portion 67 to both side portions.

Here, the engaging portion 68 is formed with a fastener, and the fastener and the connecting member 64 can be fastened by the fastening pin 66.

FIG. 8 is a cross-sectional photograph of a submarine cable with improved roundness according to the present invention, and FIG. 9 is a cross-sectional photograph of another undersurface cable according to the present invention, It is a thermal picture.

Fig. 7 is a comparison of polypropylene yarns inserted around a core portion of a conventional undersea cable. As in the case of the undersea cable according to the present invention, while flowing water at 15 캜 at a flow rate of 1 m / s vertically to the longitudinal direction of the cable, A thermal image of the cross section was taken.

9 is a cross-sectional thermal photograph taken while cooling water (water at 25 ° C) is flowing at a rate of 1 m / s through an intervening material 60-1 in the cable.

As can be seen from FIGS. 7 to 9, the results of the above-described experiment are shown in FIG. 8, in which heat is accumulated in a smaller area around the core unit 10 as compared with the image image shown in FIG. can see.

In Fig. 9, it can be seen that heat is accumulated in a smaller area around the core portion 10 as compared with Fig.

Therefore, even if the optical cable unit is disposed near the center of the submarine cable in order to minimize the bending of the optical cable unit, the heat generated in the core part is smoothly dissipated as the submarine cable is energized. It is possible to reduce the influence of the heat on the optical cable, such as deterioration and shortening the service life.

While the present invention has been described with reference to the exemplary embodiments and the drawings, it is to be understood that the technical scope of the present invention is not limited to these embodiments and various changes and modifications may be made without departing from the spirit and scope of the present invention by those skilled in the art. Various modifications and variations may be made without departing from the scope of the appended claims.

10: core part
20: Optical cable unit
30: bedding layer
40: armor layer
50: Serving layer
60, 70: Centering
65, 75: auxiliary intervention

Claims

A plurality of core portions each having a conductor, an inner semiconductive layer, an insulator, an outer semiconductive layer, and a sheath to transmit electric power;
An optical fiber unit including a plurality of optical fibers and an envelope surrounding the plurality of optical fibers;
And an outer protective portion surrounding the core portion and the optical cable unit,
An intervening member is disposed between the outer protective portion and the core portion,
And the optical fiber unit is disposed in a space between the core part and the intervening member.

The method according to claim 1,
Wherein the interposer is formed in a circular cross section and a plurality of interposers formed with different cross sectional diameters are disposed between the outer protective portion and the core portion.

3. The method of claim 2,
Wherein the interposition includes a center intervention and an auxiliary intervention, and the diameter of the center intervention is larger than the diameter of the dike material.

The method of claim 3,
Characterized in that the center intervening two different central intervening members are disposed in the submarine cable and the first central intervening member is formed to have a larger diameter than the second central intervening member.

5. The method of claim 4,
Wherein the submarine cable has two different dimples arranged in the submarine cable, and the first submarine is formed to have a larger diameter than the second submarine.

6. The method of claim 5,
Wherein the first central interposition is disposed in contact with the two core portions,
The pair of second central interposers are formed so as to be in contact with one of the core portions,
And the optical cable unit is disposed in a space between the pair of second central interposers and the core portion.

The method according to claim 6,
Wherein the interposer is formed in a hollow cylindrical shape.

8. The method of claim 7,
A pair of second auxiliary interposers are disposed on the pair of second central-interposing side portions,
And the second dichroic material is in contact with the second center gap, the core portion, and the outer protective portion.

9. The method of claim 8,
When the diameter of the core portion is Dc,
The diameter Dm1 of the first central intervening portion is in the range of 0.4827 X Dc 占 10 (%),
The diameter Ds1 of the first dike is in the range of 0.2372 X Dc ± 10 (%),
The diameter Dm2 of the second central intervening portion is in the range of 0.353 X Dc 占 0 (%),
And the diameter Ds2 of the second dunnage is in the range of 0.1846 × Dc ± 10 (%).

10. The method of claim 9,
Wherein the interstices have a yield strength of 3.47 to 5.75 ton / m.

11. The method of claim 10,
Wherein the first centering member is formed in a thickness range of 4.5 mm to 6.9 mm.

12. The method of claim 11,
Wherein the first dichroic material is formed in a thickness range of 3.0 mm to 4.7 mm.

13. The method of claim 12,
Wherein the second centering member is formed in a thickness range of 3.5 mm to 5.7 mm.

14. The method of claim 13,
And the second dunnage is formed in a thickness range of 2.4 mm to 4.1 mm.

15. The method according to any one of claims 10 to 14,
Wherein the interposer is thicker in thickness than the interposer having a smaller diameter than the interposer having a smaller diameter.

16. The method of claim 15,
And a spacer member or yarn is provided in a space between the pair of second centering members and the core portion.

17. The method of claim 16,
Wherein the outer protective portion comprises a bedding layer, an armor layer and a serving layer.

18. The method of claim 17,
Wherein the intervening connecting portion is coupled by a connecting member,
The connecting member has a central portion;
And an engaging portion protruding from the center portion to both side portions,
Wherein the coupling portion is formed with a fastener, and the interposition member and the coupling member are coupled by the coupling pin.

9. The method according to any one of claims 1 to 8,
The interposer is formed into a hollow cylindrical shape,
And the cooling water flows inside the interiors.