WO2017057863A1

WO2017057863A1 - Submarine cable having heterogeneous armor

Info

Publication number: WO2017057863A1
Application number: PCT/KR2016/010421
Authority: WO
Inventors: 정순철; 김선태; 차금환; 박지용; 김경수; 김두연; 이승철; 김지영
Original assignee: 엘에스전선 주식회사
Priority date: 2015-09-30
Filing date: 2016-09-19
Publication date: 2017-04-06

Abstract

The present invention relates to a submarine cable having heterogeneous armor. Particularly, the present invention relates to a submarine cable, which can effectively suppress the corrosion of armor and damage to the armor because of localized deterioration of the tensile strength of armor made of a heterogeneous metal, and can avoid: an increase in the outer diameter of a cable; structural instability thereof; and damage to a cable during the production and installation of the cable.

Description

Submarine cable with different armor

The present invention relates to a submarine cable having hetero armor. Specifically, the present invention can effectively suppress the damage of the armor and the corrosion of the armor due to the local tensile strength reduction of the armor made of dissimilar metals, increase the outer diameter of the cable and structural instability, and the production of cable The present invention relates to a submarine cable that can avoid damage.

Submarine cables are cables installed on the seabed to transfer power between two isolated points across the ocean, such as continents and continents, land and islands, and FIGS. 1A and 1B schematically illustrate cross-sectional structures of submarine cables, respectively. It is.

As shown in FIG. 1A, the submarine cable 1000 ′ generally includes a conductor 110 ′, an inner semiconducting layer 120 ′ surrounding the conductor 110 ′, and an insulation surrounding the inner semi conductive layer 120 ′. A cable core 100 'comprising a layer 130', an outer semiconducting layer 140 'surrounding the insulating layer 130' and a metal sheath layer 150 'surrounding the outer semiconducting layer 140'; And a cable protection layer 600 'surrounding the cable core 100', and the cable protection layer 600 'includes, for example, an internal sheath 610', a metal reinforcement layer 630 ', and The metal reinforcing layer 630 ′ may include bedding layers 620 ′ and 640 ′, an outer sheath 650 ′, an armor 660 ′, an outer serving layer 670 ′, and the like.

In addition, as shown in FIG. 1B, the submarine cable 1000 ′ may include a plurality of cable cores 100 ′ and a cable protection layer 600 ′ surrounding the plurality of cable cores 100 ′. Here, the cable core 100 ′ includes a conductor 110 ′, an inner semiconducting layer 120 ′ surrounding the conductor 110 ′, an insulating layer 130 ′ surrounding the inner semiconducting layer 120 ′, and the insulation. An outer semiconducting layer 140 'surrounding the layer 130', a metal sheath layer 150 'surrounding the outer semiconducting layer 140', and a sheath 160 'surrounding the metal sheath layer 150'. can do.

Since the submarine cable (1000 ') is installed on the sea floor, it is easily damaged by anchors and fishing vessels of ships in areas where fishing activities are active, and is prevented by natural phenomena such as sea storms caused by currents, blue waves, and friction with the sea floor. For this purpose it has an armor 660 ', which is generally made of a metal wire.

Armor 660 'is a structural reinforcement that not only serves to enhance the mechanical properties and performance of cable 1000' during handling and installation of the cable, but also provides resistance to external damage. In general, the armor 660 ′ is formed of steel, galvanized steel, copper, brass, bronze, or the like having a low to medium carbon content, and may be formed by a transverse winding of a wire having a circular cross section or the like.

On the other hand, the submarine cable (1000 ') is generally installed in the water at the time of installation, but some are buried in other environments, for example, the coast end, adjacent inland, the edge of the canal, such land is compared to the ambient temperature Since is high, the rated current which is the current carrying capacity of the submarine cable 1000 'is determined by the section which is buried on land among the submarine cables 1000'.

That is, the rotation of the magnetic domain in a wire made of a ferromagnetic material, such as a medium-low carbon-containing steel having a high magnetic permeability and having a high magnetic permeability, by changing the magnetic field generated by the current flowing through the conductor 100 ' Induced temperature rise due to magnetic hysteresis loss causes additional limiting of the rated current of the submarine cable 1000 '. The temperature rise due to the magnetic hysteresis loss is increased in the submarine cable 1000'. The problem is that the submarine cable (1000 ') is rated to land on the land of the cable (1000') because the problem is more serious in the section buried in land with relatively high ambient temperature than the section installed on the sea floor and using the cooling action of sea water. Limited by buried sections, and also eddy induced in the conductive material of the cable armor 660 'causing energy loss in the form of heat The same is true for eddy currents.

Thus, as shown in FIG. 2, the conventional submarine cable uses a common steel wire and the wire 661a 'constituting the armor of the first section 1100' of the cable and the armor of the second section 1200 '. The constituting wire 661b 'is a substantially non-ferromagnetic, non-ferromagnetic metal wire, for example a wire made of stainless steel, to minimize the magnetic hysteresis loss and the resulting temperature rise, thereby minimizing the rated current limit of the cable. use.

However, in the conventional submarine cable, the steel wire 661a 'and the stainless steel wire 661b' constituting the armor of each portion at the boundary between the first section 1100 'and the second section 1200' are formed. When connected to each other by butt welding or the like, the butt weld portion 664 ′ may be particularly vulnerable to tensile forces applied to the conventional subsea cable such that the armor may be broken about the butt weld portion 664 ′.

In addition, in the conventional submarine cable, the steel wire 661a 'and the stainless steel wire 661b' constituting the armor of each portion at the boundary between the first section 1100 'and the second section 1200' When connected to each other by butt welding or the like, when the butt weld portion 664 'and the contact surface 665' of the adjacent steel wire 661a 'and the stainless steel wire 661b' are exposed to seawater as an electrolyte, dissimilar metal contact corrosion In other words, galvanic corrosion is caused to damage the armor.

On the other hand, as shown in US Pat. No. 8,686,290, a conventional submarine cable is used for the butt weld portion 664 'of the steel wire 661a' and the stainless steel wire 661b 'to suppress galvanic corrosion. Although sacrificial anodes such as zinc rods are joined in the longitudinal direction, the outer diameter of the cable is locally increased and structurally unstable due to the sacrificial anode protruding from the wire. The cable may be damaged when passing.

Therefore, it is possible to effectively suppress the damage of the armor and the corrosion of the armor due to the local tensile strength reduction of the armor made of the dissimilar metal, and to avoid the increase of the outer diameter of the cable and structural instability and the breakage of the cable during the production and installation of the cable. There is an urgent need for submarine cables.

An object of the present invention is to provide a submarine cable which can effectively suppress the damage of the armor due to the local tensile strength reduction of the armor made of a dissimilar metal.

In addition, an object of the present invention is to provide a submarine cable that can effectively suppress the corrosion of armor made of dissimilar metals.

Furthermore, the present invention provides a submarine cable which can avoid the increase in outer diameter of the cable, structural instability, and breakage of the cable during the production and installation of the cable, despite adding a means for suppressing the corrosion of the armor made of dissimilar metals. For the purpose of

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

A submarine cable comprising at least one cable core and a cable protective layer surrounding the at least one cable core, the submarine cable comprising a first section at least partially embedded in the seabed and a second section at least partially landed; The cable core includes a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer, wherein the cable protective layer A silver armor, said armor including a plurality of metal wires helically wrapping said at least one cable core, said metal wire being included in the armor disposed in said first section and said second section; The second metal wire included in the armor disposed in the connection is made, the first The core wire is made of a first metal material, and the second metal wire is made of a second metal material different from the first metal material, and the connecting wire between the first metal wire and the second metal wire is blocked from an electrolyte. It provides a submarine cable comprising an electrolyte barrier membrane.

Here, the electrolyte barrier film thickness is 0.01 to 2.0 mm, it provides a submarine cable.

In addition, the electrolyte barrier film thickness is 15% or less of the metal wire thickness, provides a submarine cable.

Meanwhile, the first metal wire is plated with a third metal material having a lower natural potential than the first metal material.

And, the first metal material is provided, characterized in that the submarine cable.

In addition, the third metal material is provided with a subsea cable, characterized in that zinc.

Furthermore, the second metal material provides a submarine cable, characterized in that the non-ferromagnetic metal.

Here, the second metal material provides a submarine cable, characterized in that the stainless steel.

On the other hand, the number of the electrolyte blocking membrane disposed in any cross-section of the submarine cable is characterized in that the subsea cable is characterized in that the maximum number (N _t ) of the electrolyte blocking membrane defined by Equation 1 below.

[Equation 1]

N _t = Int [{(D _a + D _c ) × π- (Int ((D _a + D _c ) × π × S ÷ D _a ) × D _a )} ÷ (t × 2)]

In Equation 1,

D _a is the diameter of the metal wire,

D _c is the outside diameter of the inner armor in the submarine cable,

S is the dripping rate defined by Equation 2 below,

[Equation 2]

Droplet ratio (S) = {(metal wire diameter x number of metal wires) / length of the circumference connecting the center of the metal wires}

t is the thickness of the electrolyte blocking membrane.

In addition, the electrolyte blocking film has a length in the parallel adjacent metal wires constituting the armor has a length that can cover the contact surface that the side of the first metal wire and the second metal wire is in contact with each other, Provide the cable.

And, the length of the electrolyte blocking membrane, the submarine cable, characterized in that less than the short horizontal distance of the horizontal distance between the connecting portion of the metal wire on which the electrolyte blocking membrane is disposed and the connecting portion of the other metal wire adjacent to each other up and down the metal wire. To provide.

Further, the electrolyte blocking film is provided by a heat shrink tube, it provides a submarine cable.

Here, the heat shrink tube includes at least one resin selected from the group consisting of fluorine resin, silicone resin, polyolefin resin, ethylene-vinyl acetate copolymer resin, and polyester resin, the inner diameter before shrinking is 8 to 12 mm It provides a submarine cable, characterized in that the inner diameter is 2.4 to 3.6 mm at full shrinkage and the length change at full shrinkage is about -15% or less.

In addition, the heat shrink tube provides an undersea cable, characterized in that further provided with an adhesive on the inner surface.

And, the electrolyte barrier film is characterized in that the aluminum tape layer formed by the transverse winding of the aluminum tape, provides a submarine cable.

Here, the aluminum tape thickness is 0.01 to 0.07 mm, characterized in that the thickness of the aluminum tape layer is 0.1 to 1mm, provides a submarine cable.

In addition, the electrolyte blocking film is provided by applying the adhesive portion of the metal wire, it provides a submarine cable.

Here, the adhesive provides a submarine cable, characterized in that the epoxy bond for metal bonding.

And, the connection portion of the metal wire is provided with a subsea cable, characterized in that the coating treatment with a rust inhibitor.

In addition, the surface of the first metal wire, the second metal wire or both are coated with a polymer resin, it provides a submarine cable.

Further, the armor includes at least one sacrificial anode line made of a fourth metal material arranged parallel to the metal wire and having a lower natural potential than the first metal material and the second metal material. To provide.

On the other hand, a submarine cable comprising at least one cable core and a cable protection layer surrounding the at least one cable core, the submarine cable comprising at least a first section at least partially laid on the seabed and a second section at least partially laid on land. Wherein the cable core comprises a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer, wherein the cable The protective layer comprises armor, the armor comprising a plurality of metal wires spirally wrapping the one or more cable cores, the metal wires being included in the armor disposed in the first section and the first metal wire; The second metal wire included in the armor disposed in the second section is connected to, The first metal wire is made of a first metal material, and the second metal wire is made of a second metal material different from the first metal material, and the surface of the first metal wire, the second metal wire, or both thereof. The submarine cable coated with this polymer resin is provided.

Here, the surface of the second metal wire is coated with a polymer resin, the polymer resin has a density of 1.4 to 1.6 g / cc, tensile strength of 62 to 150 MPa, elongation of 2 to 20%, 3.0 to 5.5 GPa Polyamide resin having an elastic modulus, a density of 0.9 to 1.3 g / cc, a tensile strength of 13 to 200 MPa, an elongation of 3 to 2200%, a polyethylene resin having an elastic modulus of 0.6 to 1.3 GPa and 0.9 to 1.8 g / cc It provides a submarine cable, characterized in that it comprises at least one selected from the group consisting of polypropylene resin having a density, 14 to 460 MPa tensile strength, 8 to 750% elongation, elastic modulus of 0.7 to 3.6 GPa. do.

In addition, the first metal wire is provided with a submarine cable, characterized in that the plated with a third metal material having a lower natural potential than the first metal material.

Further, the third metal material is provided with a submarine cable, characterized in that zinc.

In addition, the second metal material provides a submarine cable, characterized in that the non-ferromagnetic metal.

In addition, the submarine cable is characterized in that it comprises an electrolyte blocking film for blocking the connecting portion of the first metal wire and the second metal wire from the electrolyte.

And the armor comprises at least one sacrificial anode wire made of a fourth metal material arranged in parallel with the metal wire and having a lower natural potential than the first metal material and the second metal material. To provide.

Further, the connection portion of the metal wire is provided with a subsea cable, characterized in that the coating treatment with a rust inhibitor.

On the other hand, a submarine cable comprising at least one cable core and a cable protection layer surrounding the at least one cable core, the submarine cable comprising at least a first section at least partially laid on the seabed and a second section at least partially laid on land. Wherein the cable core comprises a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer, wherein the cable The protective layer comprises armor, the armor comprising a plurality of metal wires spirally wrapping the one or more cable cores, the metal wires being included in the armor disposed in the first section and the first metal wire; The second metal wire included in the armor disposed in the second section is connected to, The first metal wire is made of a first metal material, the second metal wire is made of a second metal material different from the first metal material, and the armor is arranged in parallel with the metal wire and the first metal material. And at least one sacrificial anode wire made of a fourth metal material having a lower natural potential than the second metal material.

Here, the first metal wire is provided with a submarine cable, characterized in that the plated with a third metal material having a lower natural potential than the first metal material.

In addition, the third metal material provides a submarine cable, characterized in that the natural potential is less than or equal to that of the fourth metal material.

In addition, the second metal material is provided with a submarine cable, characterized in that the stainless steel.

Here, the fourth metal material is aluminum, zinc, magnesium or an alloy thereof, provides a submarine cable.

The fourth metal material is zinc, and the third metal material is zinc or magnesium.

The metal wire has a circular or flat cross section, and the sacrificial anode wire has a substantially same cross-sectional shape and cross-sectional area as the metal wire.

Further, the cross section of the metal wire is circular, characterized in that the submarine cable, characterized in that 3 to 8 mm in diameter.

On the other hand, it characterized in that it comprises an electrolyte barrier film for blocking the connecting portion of the first metal wire and the second metal wire from the electrolyte.

A submarine cable comprising at least one cable core and a cable protective layer surrounding the at least one cable core, the submarine cable comprising a first section at least partially embedded in the seabed and a second section at least partially landed; The cable core includes a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer, wherein the cable protective layer A silver armor, said armor including a plurality of metal wires helically wrapping said at least one cable core, said metal wire being included in the armor disposed in said first section and said second section; The second metal wire included in the armor disposed in the connection is made, the first The core wire is made of a first metal material, the second metal wire is made of a second metal material different from the first metal material, and the first metal wire and the first metal per 1 m of the unit length of the submarine cable. The number of connections of the second metal wire is n / 8 or less, wherein n is the total number of metal wires included in the armor, provides a submarine cable.

Here, the number of connecting portions of the first metal wire and the second metal wire per 1 m of any unit length of the submarine cable provides a submarine cable.

In addition, there is provided a submarine cable, characterized in that the horizontal distance between the connecting portion of each of the adjacent metal wires of the metal wire is 0.3 m or more.

The cable core is one, and the total number of metal wires included in the armor is 48, and a distance between the first connection part and the last connection part of the connection parts of the metal wires included in the armor is 17 m. Provide submarine cables.

Further, the cable core is three, the total number of metal wires included in the armor is 116, the distance between the first connection and the last connection of the metal wires included in the armor is characterized in that 60 m Provide submarine cables.

On the other hand, the connecting portion is provided by the butt welding of the first metal wire and the second metal wire, provides a submarine cable.

In addition, the first metal material provides a submarine cable, characterized in that the steel.

The second metal material is a non-ferromagnetic metal.

Further, the cable protection layer provides a submarine cable, characterized in that it comprises a bedding layer, armor and outer serving layer.

The submarine cable according to the present invention exhibits an excellent effect of effectively suppressing the local tensile strength reduction of the armor and the damage caused by the armor by precisely controlling the distribution of the connection between the dissimilar metals in the armor made of the dissimilar metal.

In addition, the submarine cable according to the present invention exhibits an excellent effect of effectively suppressing corrosion of the metal wire constituting the armor and at the same time avoiding unnecessary increase in the outer diameter of the cable and breakage of the cable during production and installation of the cable.

1A and 1B schematically illustrate the cross-sectional structure of a conventional submarine cable.

Figure 2 schematically shows armor at the boundary of the first and second sections of a conventional submarine cable.

3a and 3b schematically illustrate the cross-sectional structure of the submarine cable according to the present invention.

Figure 4 schematically shows one embodiment of the distribution of the connection in the armor of the submarine cable according to the present invention.

Figure 5 shows an embodiment of the electrolyte barrier membrane as a corrosion protection means for the armor of the submarine cable according to the present invention.

FIG. 6 schematically illustrates a method of including a heat shrink tube as an electrolyte blocking membrane in a submarine cable according to the present invention.

Figure 7 schematically shows the arrangement of the metal wire and the electrolyte barrier film constituting the armor in the submarine cable according to the present invention.

Figure 8 schematically shows the structure of the armor unstable when the number of electrolyte barrier membranes disposed in any cross section of the submarine cable according to the present invention is excessive.

Figure 9 shows an embodiment of the polymer coating as a corrosion protection means for the armor of the submarine cable according to the present invention.

10 and 11 show an embodiment of the sacrificial anode as a corrosion protection means for the armor of the submarine cable according to the present invention.

12 to 14 show combinations of the corrosion protection means shown in FIGS. 5 to 11, respectively.

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

The submarine cable 1000 according to the present invention has a high conductivity such as copper (Cu), aluminum (Al), etc. having high conductivity and proper strength and flexibility so as to minimize power loss as a movement path of electric current for power transmission, and in particular, has a large elongation. One or more conductors 110 made of a high conductivity wire, surrounding the conductors 110, suppressing uneven charge distribution on the surface of the conductors 110, alleviating electric field distributions from the inside of the cable 1000, and An inner semiconducting layer 120 for eliminating gaps between the insulating layer 130 and the insulating layer 130, which will be described later, to suppress partial discharge, dielectric breakdown, etc., and the inner semiconducting layer 120, and made of an insulating material such as a polymer resin or insulating paper. Wraps the insulating layer 130 and the insulating layer 130 and suppresses uneven charge distribution between the insulating layer 130 and the metal sheath layer 150 to be described later to mitigate electric field distribution, The outer semiconducting layer 140 and the outer semiconducting layer 140 which physically protect the insulating layer 130 from the metal sheath layer 150 are wrapped to equalize the electric field inside the insulating layer 130 and the electric field is formed by a cable ( 1000) It prevents it from going outside to get an electrostatic shielding effect, and also acts as a return of the fault current in case of a ground fault or short circuit of the cable 1000 through grounding at one end of the cable 1000, for safety. One or more cable cores 100 including a metal sheath layer 150 that not only protects the cable 1000 from external shock, pressure, etc., but also improves the degree of ordering, flame retardancy, etc. of the cable 1000, and the It may include a cable protective layer 600 to surround the cable core 100 and disposed outside the cable 1000 to protect the cable 1000 from external impact, pressure, and the like.

The submarine cable 1000 according to the present invention may be applied to the case where there is only one cable core 100 as shown in FIG. 3A, but is also applicable to the case where the cable cores 100 are provided as shown in FIG. 3B. The plurality of cable cores 100 may further include an inner sheath 160 surrounding the metal sheath layer 150, respectively.

In this case, the cable protection layer 600 is to improve the corrosion resistance, water resistance, etc. of the cable and the inner sheath 610 to perform the function of protecting the cable 1000 from mechanical trauma, heat, fire, ultraviolet rays, insects or animals and External sheath 650, metal reinforcing layer 630 to protect the cable 1000 from mechanical impact, bedding layers 620 and 640 disposed above and below the metal reinforcing layer 630, sea currents from the seabed, reefs, etc. It may additionally protect and include an armor 660, an outer serving layer 670 made of iron wire and the like. However, the cable protection layer 600 surrounding the plurality of cable cores 100 as shown in FIG. 3B may not include the inner sheath 610, the metal reinforcing layer 630, and the cable according to the present invention. The protective layer 600 may be variously designed according to the cable design.

In particular, the armor 660 may be formed by cross-circling a plurality of metal wires 661 made of a circular or flat cross section and made of metal. The plurality of metal wires 661 may be steel or stainless steel having excellent mechanical strength. It may include an iron wire made of. Here, the diameter of the metal wire 661 may be about 3 to 8 mm.

As shown in FIG. 4, in the submarine cable 1000 according to the present invention, the armor 660 includes a plurality of metal wires that spirally wrap the one or more cable cores, and the armor 660 is at least partially. The first metal wire 661a constituting the armor 660 disposed in the first section 1100 laid on the seabed and the armor 660 disposed in the second section 1200 laid at least partially on land. It may include a second metal wire (661b) constituting.

Preferably, the first metal wire 661a is made of a first metal material, preferably steel of low cost and excellent supply availability and mechanical properties, whereas the second metal wire 661b is formed of the first metal material. It may be made of a different second metal material, preferably a non-ferromagnetic metal, such as stainless steel, which is substantially insensitive to ferromagneticity.

More preferably, the first metal wire 661a may be plated with a third metal material having a natural potential lower than the first metal material constituting the same, for example, zinc, and the plating layer may be an electrolyte such as seawater. When exposed to the cathode, the first metal wire 661a may be cathodic to be corroded instead of the first metal wire 661a to suppress corrosion of the first metal wire 661a.

The first section 1100 may utilize the cooling action of the sea water, and thus, may be used for energy loss in the form of heat such as magnetic hysteresis loss or eddy current due to the change of the magnetic field generated by the current flowing through the conductor 100. Since the heating caused by the heating does not seriously raise the rated current which is the current carrying capacity of the submarine cable, the submarine cable 1000 according to the present invention is a relatively inexpensive steel wire for the first section 1100. ) Can achieve the effect of reducing the manufacturing cost of the cable.

On the other hand, the second section 1200 has a high ambient temperature of about 10 ° C. or more relative to the sea floor, and heat generation due to energy loss in the form of heat such as magnetic hysteresis loss or eddy current may be a serious problem. Since the rated current, which is a current carrying capacity of, may decrease or the outer diameter of the submarine cable 1000 may increase unnecessarily, the submarine cable 1000 according to the present invention may avoid magnetic hysteresis loss in the second section 1200. By forming the armor 660 from a non-ferromagnetic metal, such as stainless steel wire, which is not substantially ferromagnetic, which can be minimized, it is possible to achieve an effect of suppressing a decrease in the rated current of the cable and an unnecessary increase in the outer diameter.

However, as shown in FIG. 4, the armor 660 disposed in each of the

portions

1100 and 1200 at the boundary of the submarine cable 1000 that is switched from the first section 1100 to the second section 1200. The first metal wire 661a and the second metal wire 661b constituting the first and

second metal wires

661a and 661b are connected to each other by butt welding, and the like. Because of the relative weakness of tensile strength relative to other parts of 661b), when these connections 664 are gathered, the armor is likely to be locally broken around these gathered connections 664.

Thus, the inventors have adjusted the number of connections of the first metal wire 661a and the second metal wire 661b per m of any unit length of the submarine cable according to the present invention to n / 8 or less, where n Is the total number of metal wires 661 constituting the armor, and when the horizontal distance between the connecting portions of adjacent metal wires 661 is adjusted to 0.3 m or more, the local tensile strength of the armor decreases and thereby the local of the armor The present invention was completed by confirming that phosphorus breakage can be effectively suppressed.

According to an embodiment of the present invention, when the submarine cable has a structure as shown in FIG. 3A, the total number of metal wires 661 constituting the armor 660 is 48, and any unit length 1 of the submarine cable is 1. the number of connecting portions 664 of the first metal wire 661a and the second metal wire 661b per m is 0 to 6, and the horizontal distance between the first connecting portion 664 and the last connecting portion 664 is 17 m, The horizontal distance between the connections 664 of the adjacent metal wire 661 may be about 0.35 m.

In addition, when the submarine cable according to the present invention has a structure as shown in Figure 3b, the total number of metal wires 661 constituting the armor 660 is 116, per unit length of any unit length of the submarine cable The number of connecting portions 664 of the first metal wire 661a and the second metal wire 661b is 0 to 6, the horizontal distance between the first connecting portion 664 and the last connecting portion 664 is 60 m, and the adjacent metal The horizontal distance between the connections 664 of the wire 661 may be about 0.52 m.

The submarine cable according to the present invention may include at least one corrosion inhibiting means selected from the group consisting of an electrolyte barrier film, a polymer coating, a sacrificial anode, and the like, as described below with reference to FIGS. 5 to 11.

Figure 5 shows one embodiment of the electrolyte barrier membrane as a corrosion protection means for the armor of the submarine cable according to the present invention.

As shown in FIG. 5, in the submarine cable 1000 according to the present invention, the armor 660 includes a plurality of metal wires that spirally wrap the one or more cable cores, and the armor 660 is at least partially. The first metal wire 661a constituting the armor 660 disposed in the first section 1100 laid on the seabed and the armor 660 disposed in the second section 1200 laid at least partially on land. It may include a second metal wire (661b) constituting.

However, as shown in FIG. 5, the armor 660 disposed in each of the

portions

1100 and 1200 at the boundary thereof, which is switched from the first section 1100 to the second section 1200 of the submarine cable 1000. The first metal wire 661a and the second metal wire 661b constituting the second metal wire 661a are connected to each other by butt welding, or the like, wherein the first metal wire 661a is a steel wire and the second metal wire 661b is stainless steel. Since the wires are different dissimilar metals, dissimilar metal contact corrosion occurs when the contact points 664 and the contact surfaces 665 of the adjacent first metal wire 661a and the second metal wire 661b are exposed to an electrolyte such as seawater. Phosphorus galvanic corrosion may occur to damage the armor 660.

Accordingly, the submarine cable according to the present invention is a portion of the connection of the first metal wire 661a and the second metal wire 661b constituting the armor 660 as the armor 660, for example, the contact point 664 portion. Galvanic corrosion, which is a dissimilar metal contact corrosion, can be suppressed by further including an electrolyte barrier film 663 which blocks the electrolyte from an electrolyte such as seawater.

The electrolyte blocking membrane 663 may be formed by, for example, a heat shrink tube, an aluminum tape, an adhesive, and the like, and the electrolyte blocking membrane 663 is different from the sacrificial anode which protrudes and joins on the joint portion of the conventional dissimilar metal wire. Since it hardly protrudes from the surface of the metal wire 661, the projection of the conventional sacrificial anode increases the outer diameter of the cable and makes it structurally unstable, and also causes the surface of the cable to become irregular to pass through the cable production and laying paths. It further exhibits an excellent effect of suppressing breakage of the cable.

In this case, when the electrolyte barrier layer 663 is thick, it is difficult to apply the armor formation process and the outer diameter becomes uniform. Therefore, the electrolyte barrier layer 663 is preferably formed to have a thin thickness. It is more preferable that it is formed to 2 mm and is 15% or less of the thickness of the metal wire 661.

In the present invention, the connecting portion of the first metal wire 661a and the second metal wire 661b is coated by applying a rust preventive containing aluminum or zinc particles or the like before forming the heat shrink tube 663. Can be. The anti-corrosive agent inhibits corrosion of metal particles having low natural potentials by being electrically connected to the first metal wire 661a and the second metal wire 661b to cathodic the metal wire 661. As it performs cathodic protection, it can play a secondary role in corrosion protection.

Here, the rust preventive agent may include 10 to 50% of the metal particles having a lower natural potential than the first metal material and the second metal material by the total weight, for example, 30 to 40% by weight of the dimethyl ether based on the total weight. , Toluol may include 25 to 30% by weight, zinc particles 20 to 30% by weight, epoxy resin 15 to 20 parts by weight.

In particular, the heat shrink tube as the electrolyte blocking membrane 663 is a tube having a property of shrinking by heating, and may be formed by performing the steps of (a) to (e) as shown in FIG. The connection between the metal wire 661a and the second metal wire 661b can be sealed to block the penetration of electrolytes such as seawater, and the electrolyte barrier membrane 663 can be easily formed and the sealing property is excellent. Most preferred in terms of aspect.

The method of forming the heat shrink tube may include, for example, inserting a heat shrink tube as an electrolyte blocking membrane 663 at an end of the first metal wire 661a, and the first metal wire 661a and the second metal. (B) connecting both ends of the wire 661b by butt welding or the like, and applying a rust inhibitor 666 around the connecting portion 664 of the first metal wire 661a and the second metal wire 661b. (c) moving the heat shrink tube over the connection part 664, heat shrinking the heat shrink tube by heating, and the like.

The heat-shrink tube is not particularly limited, and for example, a fluorine-based resin, a silicone-based resin, a polyolefin-based resin, an ethylene-vinyl acetate-based copolymer resin, a polyester-based resin, or the like may be used as a base resin, and as necessary, a flame retardant and a stabilizer. It can be prepared by a composition further comprising various functional additives, such as antioxidants, crosslinking aids, lubricants, anti-UV agents, antistatic agents, pigments.

The heat shrink tube may have an inner diameter of 8 to 12 mm before contraction, an inner diameter of 2.4 to 3.6 mm at full contraction, and a length change at full contraction time of about -15% or less. The heat shrink tube may further improve the sealing property by further including an adhesive on an inner surface thereof.

The electrolyte blocking film 663 may be formed using an aluminum tape layer formed by the transverse winding of the aluminum tape. For example, a thin aluminum tape having a thickness of about 0.01 to 0.07 mm is laminated on the connecting portion of the first metal wire 661a and the second metal wire 661b by cross-winding so as to have a thickness of 0.1 to 1 mm. By forming a tape layer, the connection portion can be sealed to block penetration of electrolytes such as seawater. The aluminum tape has the advantage that the thickness of the aluminum tape layer formed by its transverse winding is thin and lightweight.

The electrolyte barrier layer 663 may be formed by applying an adhesive, for example, an epoxy bond for metal bonding having a high strength of about 230 kg / cm 2 or more and a high heat resistance of 120 ° C. or higher, and which does not flow down during application. It is preferable that baking is excellent. The adhesive has an advantage in that the electrolyte barrier film 663 is easily formed due to the very thin thickness.

Fig. 7 schematically shows the arrangement of the metal wire and the electrolyte barrier film constituting the armor in any cross section of the submarine cable according to the present invention, and Fig. 8 is arranged in any cross section of the submarine cable according to the present invention. When the number of electrolyte blocking membranes is excessive, the structure of the armor is schematically shown.

As shown in Fig. 8, in any cross section of the submarine cable according to the present invention, the metal wire 661 when the number of the electrolyte blocking membranes 663 disposed on the metal wire 661 constituting the armor 660 is excessive. The free space between the wires may be eliminated, and as a result, the metal wire 661 may locally protrude out, thereby increasing the outer diameter of the submarine cable or causing the submarine cable to be structurally unstable.

In order to solve this problem, in the present invention, the connection portions of the plurality of first metal wires 661a and the second metal wires 661b are formed to be distributed along the cable length direction, thereby forming the number of metal wires 661. The plurality of electrolyte blocking membranes 663 are also formed to be distributed along the cable longitudinal direction so that the number of electrolyte blocking membranes 663 is not excessive in any cross section of the submarine cable.

Therefore, the number of electrolyte barrier membranes 663 disposed in any cross section of the submarine cable according to the present invention is preferably equal to or less than the maximum number of electrolyte barrier membranes N _t defined by Equation 1 below. As a result, the submarine cable according to the present invention can suppress the external diameter of the submarine cable from increasing locally or structurally unstable by the electrolyte blocking membrane 663 disposed locally excessively.

[Equation 1]

In Equation 1,

D _a is the diameter of the metal wire,

D _c is the outer diameter of the armor inside the submarine cable,

S is the drip rate,

t is the thickness of the electrolyte blocking membrane.

Herein, the function value Int (x) is an integer excluding the decimal point of x, and the spot ratio S represents the degree of free space between the metal wires 661, and the larger the spot ratio S, Means no free space, and may be defined by Equation 2 below, and may be 0.90 or more, for example, 0.95 to 0.98.

[Equation 2]

Here, the spot ratio S is defined between the metal wires 661 at the circumferential length L _c connecting the centers of the metal wires, the circumference of which the metal wires 661 are arranged, without considering the electrolyte blocking film. It means the ratio of the length of the metal wires 661 excluding the gap, which is a predetermined design value before the cable manufacturing, and is generally defined as 0.95 ~ 0.98. If the value of the droplet rate S is too small, a space without the metal wire 661 becomes large, which may cause a problem in the role of the armor, and if the value is too large, manufacturing becomes difficult.

In addition, the process of deriving the above equation will be described in detail.

L _c = (D _a + D _c ) × π when the perimeter of the metal wires 661 is arranged, that is, the circumferential length connecting the centers of the metal wires is L _c , and the length of the metal wires 661 occupies When L _a , since L _a = L _c × S, the number N _a = Int (L _a / D _a ) of the metal wires 661 arranged accordingly is obtained.

Therefore, the total gap G _a = L _c − (N _a × D _a ), which is the sum of the gaps between the metal wires 661 around the arrangement of the metal wires 661, is calculated so that the cable is structurally stable. The maximum number of electrolyte barrier membranes (N _t ) for this purpose can be calculated as N _t = Int (G _a / (t × 2).

If the electrolyte barrier membrane 663 is formed in the cross-section of any cable more than the maximum number, as shown in Figure 8, the position where the metal wires are arranged to be properly lifted, the outer diameter of the cable increases or structural instability Done.

In the present invention, by connecting the plurality of first metal wire (661a) and the second metal wire (661b) in which the electrolyte blocking film 663 is formed to be distributed along the cable length direction, the above problems do not occur. .

Here, the diameter (D _a ) of the metal wire is 3 to 8 mm, the outer diameter (D _c ) of the inside of the armor in the submarine cable is 80 to 300 mm, the thickness (t) of the electrolyte barrier membrane is the heat shrink tube In the case of 0.5 to 2 mm.

As illustrated in FIG. 7, in the adjacent metal wires 661 constituting the armor 660, the first metal wire 661a and the second metal wire (for each metal wire 661). The connections of 661b may be disposed at different positions along the cable length direction, whereby the first metal wire 661a of the metal wire 661 of one of the metal wires 661 adjacent to each other and the other metal wire ( A surface in which the second metal wire 661b of 661 contacts each other may be generated, and dissimilar metal contact corrosion may occur at the contact surface 665.

Accordingly, the electrolyte blocking layer 663 has a length that can cover the contact surface 665 in which side surfaces of the first metal wire 661a and the second metal wire 661b are in contact with each other in the adjacent metal wires 661. It is preferable to suppress the contact between the first metal wire 661a and the second metal wire 661b, for example, may have a length of 300 to 500 mm.

On the other hand, when the lengths of the electrolyte blocking membranes 663 formed on the parallel adjacent metal wires 661 are excessively overlapped with each other, the outer diameter of the cable in the corresponding portion may locally increase or the structure of the armor may become unstable.

Therefore, the length of the electrolyte blocking film 663 is a length of the metal wire into which the electrolyte blocking film 663 is inserted so that the electrolyte blocking films 663 formed on the parallel adjacent metal wires 661 do not overlap each other along the cable length direction. Of the first metal wire 661a and the second metal wire 661b constituting the connecting portion of the first metal wire 661a and the second metal wire 661b and other metal wires adjacent to the metal wire, respectively. It can be adjusted to less than the short horizontal distance of the horizontal distance between the connection.

In this case, when the electrolyte blocking membrane 663 is adjusted to a short length, the first metal wire 661a of one metal wire 661 of the adjacent metal wires 661 and the second metal of the other metal wire 661 are different. The surfaces of the wires 661b may be in contact with each other to generate dissimilar metal contact corrosion at the contact surface 665. In this case, by applying a means for coating a polymer resin on the surface of the metal wire to be described later, It is possible to solve the problem of dissimilar metal contact corrosion in the contact surface of the metal wires.

As shown in FIG. 9, the submarine cable according to the present invention may be coated with a polymer resin on a surface of the first metal wire 661a, the second metal wire 661b, or both of the metal wires 661. The polymer resin may include a resin such as polyamide, polyethylene, polypropylene, or the like. Wherein the second metal wire 661b included in the second section where the submarine cable is at least partially laid on land is relatively greater than the first metal wire 661a included in the first section that is at least partially laid in the seabed. Since the length is short, the surface of the second metal wire 661b may be preferably coated with a polymer resin. The polymer resin formed as described above suppresses dissimilar metal contact corrosion by preventing contact surfaces in which side surfaces of the first metal wire 661a and the second metal wire 661b directly contact with each other in parallel adjacent metal wires 661a. can do.

The polymer resin has a density of about 1.4 to 1.6 g / cc, about 62 to 150 in the case of the polyamide resin, in order to realize physical properties such as thixotropy, strength, elongation, and elasticity required as the use of the metal wire coating of the armor. It can have a tensile strength of MPa, an elongation of about 2 to 20%, and an elastic modulus of about 3.0 to 5.5 GPa.

In addition, the polyethylene resin may have a density of about 0.9 to 1.3 g / cc, a tensile strength of about 13 to 200 MPa, an elongation of about 3 to 2200%, an elastic modulus of about 0.6 to 1.3 GPa, the polypropylene The resin may have a density of about 0.9 to 1.8 g / cc, a tensile strength of about 14 to 460 MPa, an elongation of about 8 to 750%, and an elastic modulus of about 0.7 to 3.6 GPa.

The submarine cable according to the present invention is formed by coating a surface of the metal wire 661 constituting the armor 660 with a polymer resin, and the first metal wire 661a and the first metal wires in parallel adjacent metal wires 661. The contact surface which the side surface of the 2 metal wire 661b directly contacts does not generate | occur | produce, and the hetero metal contact corrosion is suppressed.

As shown in FIGS. 10 and 11, the submarine cable according to the present invention is corroded in place of the first metal wire 661a and the second metal wire 661b constituting the armor 660 as the armor 660. It may include one or more sacrificial anodes 662 to function to avoid or suppress damage to the armor 660 due to galvanic corrosion.

The sacrificial anode wire 662 has a substantially same cross-sectional shape, diameter, cross-sectional area, and the like as the metal wire 661 and is parallel to the metal wire 661, unlike the sacrificial anode that protrudes and joins on a connection of a conventional dissimilar metal wire. Since the outer diameter of the cable is increased and the surface of the cable is irregular due to the protrusion of the sacrificial anode, the cable has an excellent effect of preventing the cable from being broken when passing through the production and laying path of the cable.

The fourth metal material constituting the sacrificial anode line 662 includes a first metal material constituting the first metal wire 661a constituting the armor 660 and a second metal constituting the second metal wire 661b. The natural potential is lower than that of the material and may have a natural potential equal to or greater than that of the third metal material constituting the plating layer of the first metal eye 661a.

In the embodiment of the present invention, since the steel of -0.46 to 0.65V is used as the first metal material and the stainless steel of -0.28V is used as the second metal material, the fourth metal material is aluminum, zinc, magnesium. Or an alloy thereof. In particular, when the fourth metal material constituting the sacrificial anode line 662 is zinc (Zn) having a natural potential of -1.07 V, the third metal material constituting the plating layer is zinc (Zn). Or magnesium (Mg) having a lower natural potential, that is, a natural potential of -1.6V.

As a result, the sacrificial anode wire 662 is electrically connected to the metal wire 661 constituting the armor 660 to perform a cathodic protection function to suppress corrosion by cathodic the metal wire 661. . In addition, since the plating layer is first corroded compared to the sacrificial anode line 662, the sacrificial anode line 662 may maintain a role of the exterior while the plating layer is corroded.

On the other hand, the sacrificial anode line 662 included in the armor 660 of the submarine cable according to the present invention may design the total weight required in consideration of the cable target life and the sacrificial anode consumption rate or the sacrificial anode generating current.

In addition, dividing the total weight of the minimum sacrificial anode line 662 by one mass according to the design outer diameter of the sacrificial anode line 662 provides a minimum number of necessary sacrificial anode lines 662. According to the design, it has an excellent effect of effectively suppressing the corrosion of the armor 660 during the life of the cable.

As shown in FIG. 12, the submarine cable according to the present invention is provided at the contact point 664 and the contact surface 665 between the first metal wire 661a and the second metal wire 661b by the electrolyte blocking membrane 663. A sacrificial anode line 662 is further added to inhibit the dissimilar metal contact corrosion, that is, galvanic corrosion, and to prevent the armor 660 from being damaged by any corrosion. It may include.

In addition, as shown in FIG. 13, the submarine cable according to the present invention has a contact surface 665 between the first metal wire 661a and the second metal wire 661b by coating the non-ferromagnetic metal wire 661b with a polymer resin. Sacrificial anode wire 662 that inhibits dissimilar metal contact corrosion, that is, galvanic corrosion, and is damaged in place of the armor 660 in order to prevent damage to the armor 660 by any corrosion that occurs. It may further include.

As shown in FIG. 14, the submarine cable according to the present invention has a contact point 664 and a contact surface 665 between the first metal wire 661a and the second metal wire 661b by the electrolyte blocking membrane 663. Dissimilar metal contact corrosion, i.e. galvanic corrosion, at the same time, the second metal wire (661b) to the polymer resin in case the electrolyte barrier membrane (663) does not cover all of the contact surface (665) Can be coated.

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

Claims

A submarine cable comprising at least one cable core and a cable protective layer surrounding the at least one cable core,

The submarine cable comprises a first section at least partially laid on the seabed and a second section at least partially laid on land;

The cable core includes a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer,

The cable protective layer includes an armor,

The armor comprises a plurality of metal wires spirally wrapping the at least one cable core,

The metal wire is formed by connecting the first metal wire included in the armor disposed in the first section and the second metal wire included in the armor disposed in the second section,

The first metal wire is made of a first metal material, the second metal wire is made of a second metal material different from the first metal material,

An undersea cable comprising an electrolyte blocking film for blocking a connection between the first metal wire and the second metal wire from an electrolyte.
The method of claim 1,

And the first metal wire is plated with a third metal material having a lower natural potential than the first metal material.
The method of claim 1,

The number of electrolyte barrier films disposed in any cross-section of the submarine cable is characterized in that less than the maximum number of electrolyte barrier membrane (N t ) defined by Equation 1 below.

[Equation 1]

N t = Int [{(D a + D c ) × π- (Int ((D a + D c ) × π × S ÷ D a ) × D a )} ÷ (t × 2)]

In Equation 1,

D a is the diameter of the metal wire,

D c is the outer diameter of the armor inside the submarine cable,

S is the dripping rate defined by Equation 2 below,

[Equation 2]

Droplet ratio (S) = {(metal wire diameter x number of metal wires) / length of the circumference connecting the center of the metal wires}

t is the thickness of the electrolyte blocking membrane.
The method of claim 1,

The electrolyte blocking membrane is formed by a heat shrink tube, submarine cable.
The method of claim 1,

The connection portion of the metal wire, characterized in that the coating is coated with a rust inhibitor.
The method of claim 1,

Submarine cable, characterized in that the surface of the first metal wire, the second metal wire or both are coated with a polymer resin.
The method of claim 1,

And the armor comprises at least one sacrificial anode wire made of a fourth metal material arranged in parallel with the metal wire and having a lower natural potential than the first metal material and the second metal material.
A submarine cable comprising at least one cable core and a cable protective layer surrounding the at least one cable core,

The submarine cable comprises a first section at least partially laid on the seabed and a second section at least partially laid on land;

The cable core includes a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer,

The cable protective layer includes an armor,

The armor comprises a plurality of metal wires spirally wrapping the at least one cable core,

The metal wire is formed by connecting the first metal wire included in the armor disposed in the first section and the second metal wire included in the armor disposed in the second section,

The first metal wire is made of a first metal material, the second metal wire is made of a second metal material different from the first metal material,

Submarine cable, wherein the surface of the first metal wire, the second metal wire or both are coated with a polymer resin.
A submarine cable comprising at least one cable core and a cable protective layer surrounding the at least one cable core,

The submarine cable comprises a first section at least partially laid on the seabed and a second section at least partially laid on land;

The cable core includes a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer,

The cable protective layer includes an armor,

The armor comprises a plurality of metal wires spirally wrapping the at least one cable core,

The metal wire is formed by connecting the first metal wire included in the armor disposed in the first section and the second metal wire included in the armor disposed in the second section,

The first metal wire is made of a first metal material, the second metal wire is made of a second metal material different from the first metal material,

And said armor comprises one or more sacrificial anodes arranged in parallel with said metal wire and comprising a fourth metal material having a lower natural potential than said first metal material and said second metal material.
The method of claim 9,

And the first metal wire is plated with a third metal material having a lower natural potential than the first metal material.
The method of claim 10,

The third metal material is a subsea cable, characterized in that the natural potential is less than or equal to the fourth metal material.
The method of claim 9,

And the first metal material is steel.
The method of claim 12,

And the second metal material is a non-ferromagnetic metal.
The method of claim 13,

And the second metal material is stainless steel.
The method of claim 11,

The fourth metal material is aluminum, zinc, magnesium or an alloy thereof, submarine cable.
The method of claim 11,

And the fourth metal material is zinc, and the third metal material is zinc or magnesium.
The method of claim 9,

Submarine cable, characterized in that the surface of the first metal wire, the second metal wire or both are coated with a polymer resin.
A submarine cable comprising at least one cable core and a cable protective layer surrounding the at least one cable core,

The submarine cable comprises a first section at least partially laid on the seabed and a second section at least partially laid on land;

The cable core includes a conductor, an inner semiconducting layer surrounding the conductor, an insulating layer surrounding the inner semiconducting layer, an outer semiconducting layer surrounding the insulating layer, and a metal sheath layer surrounding the outer semiconducting layer,

The cable protective layer includes an armor,

The armor comprises a plurality of metal wires spirally wrapping the at least one cable core,

The metal wire is formed by connecting the first metal wire included in the armor disposed in the first section and the second metal wire included in the armor disposed in the second section,

The first metal wire is made of a first metal material, the second metal wire is made of a second metal material different from the first metal material,

The number of connecting portions of the first metal wire and the second metal wire per m of any unit length of the submarine cable is n / 8 or less, wherein n is the total number of metal wires included in the armor. Phosphorus, submarine cable.
The method of claim 18,

The submarine cable according to claim 1, wherein the number of connecting portions of the first metal wire and the second metal wire is 6 or less per 1 m of the unit length of the submarine cable.
The method of claim 18,

Submarine cable, characterized in that the horizontal distance between the connecting portion of each of the adjacent metal wires of the metal wire is more than 0.3 m.
The method of claim 18,

And the connection portion is formed by butt welding the first metal wire and the second metal wire.