Low-loss light submarine cable

Abstract

The invention provides a low-loss light submarine cable, and relates to the technical field of cables. The low-loss light submarine cable comprises a power cable core, the power cable core comprises a conductor cluster and a protection structure wrapping the conductor cluster, the conductor cluster comprises a plurality of water-blocking conductors which are twisted and wound, and each water-blocking conductor comprises a conductor wire and an insulating film layer attached to the outer wall of the conductor wire; an optical fiber unit; and the wrapping structure wraps the peripheries of the power cable core and the optical fiber unit, the wrapping structure comprises at least one armor layer, the armor layer comprises a plurality of spirally twisted armor monomers, and each armor monomer comprises a metal wire and a coating layer attached to the outer wall of the metal wire. The low-loss light submarine cable provided by the invention has the characteristics of low loss and light weight, and can be used in large-water-depth and large-capacity alternating current submarine cable engineering.

Description

Technical Field

[0001] The present application relates to the field of cable technology, and in particular to a low-loss lightweight submarine cable. Background Art

[0002] With the rapid development of the marine power transmission field and the advancement of the "dual carbon" policy, submarine cables are increasingly used in fields such as marine wind power and cross-sea power transmission, and have become an important infrastructure for achieving efficient transmission of renewable energy.

[0003] At present, the design and application of submarine cables are gradually evolving towards long distance, low loss and light weight. Traditional submarine cables usually use copper wires as conductors. The copper wires are closely arranged and interconnected, which easily leads to skin effect. The current is mainly concentrated on the edge of the conductor during operation, rather than evenly distributed, thereby increasing AC resistance and energy loss. In addition, the armor layer of the current submarine cable is usually composed of galvanized steel wire or copper wire. Although it can provide excellent mechanical strength, it also increases the armor loss and the weight of the submarine cable. Summary of the invention

[0004] In view of the above problems, the embodiment of the present application provides a low-loss light submarine cable. The low-loss light submarine cable has the characteristics of low loss and light weight, and can be used in deep water and large-capacity AC submarine cable projects.

[0005] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0006] The present application provides a low-loss lightweight submarine cable, comprising: a power cable core, the power cable core comprising a conductor cluster and a protective structure coated outside the conductor cluster, the conductor cluster comprising a plurality of twisted and wound water-blocking conductors, the water-blocking conductor comprising conductor wires and an insulating film layer attached to the outer wall of the conductor wires; an optical fiber unit; a coating structure coated on the outer periphery of the power cable core and the optical fiber unit, the coating structure comprising at least one armor layer, the armor layer comprising a plurality of spirally twisted armor monomers, the armor monomers comprising metal wires and a coating layer attached to the outer wall of the metal wires.

[0007] In a possible implementation manner, the insulation resistivity of the insulating film layer is greater than or equal to 400 MΩ·cm, and / or the thickness of the insulating film layer is less than or equal to 300 μm.

[0008] In a possible implementation manner, the insulating film layer is a polyethylene layer.

[0009] In a possible implementation, the coating layer of the armored unit is an anti-corrosion conductive layer, and the neutral salt spray corrosion rate of the anti-corrosion conductive layer is less than or equal to 0.001 mm / a, and the salt water full immersion corrosion rate is less than or equal to 0.001 mm / a.

[0010] In a possible implementation manner, the metal wire of the armor unit is an aluminum alloy wire.

[0011] In a possible implementation, the protective structure includes an insulating layer, a water-blocking layer, and a non-metallic sheath layer, which are arranged in sequence from the inside to the outside.

[0012] In a possible implementation manner, at least two power cable cores are provided, a filling layer is provided between adjacent power cable cores, and the optical fiber unit is provided in the filling layer.

[0013] In a possible implementation manner, the optical fiber unit includes: an optical unit and a protective structure coated on the outer side of the optical unit.

[0014] In a possible implementation manner, the protection structure includes an inner sheath, an optical unit armor layer, a tape layer, and an outer sheath, which are arranged in sequence from the inside to the outside.

[0015] In a possible implementation, the coating structure further includes: a wrapping layer, an inner lining layer, and an outer coating layer, which are arranged from the inside to the outside, and the armor layer is located between the inner lining layer and the outer coating layer.

[0016] The low-loss lightweight submarine cable provided by the present application includes a power cable core, an optical fiber unit and a coating structure. The power cable core includes a conductor cluster and a protective structure coated outside the conductor cluster, and the conductor cluster includes a plurality of twisted and wound water-blocking conductors, and the water-blocking conductor includes a conductor wire and an insulating film layer attached to the outer wall of the conductor wire. Among them, the insulating film layer attached to the outer wall of the conductor wire can not only provide physical protection for the conductor wire, but also effectively inhibit the skin effect and proximity effect, reduce the concentrated distribution of current on the surface of the conductor wire, and reduce the AC resistance, thereby reducing the energy loss in the process of power transmission and improving the transmission efficiency of the water-blocking conductor. The coating structure is coated on the periphery of the power cable core and the optical fiber unit, and the coating structure includes at least one armor layer, and the armor layer includes a plurality of spirally twisted armor monomers, and the armor monomers include metal wires and a coating layer attached to the outer wall of the metal wire. In this way, by adding a coating layer outside the metal wire, the weight of the submarine cable can be significantly reduced while ensuring the bending strength and tensile strength of the submarine cable. Therefore, the low-loss lightweight submarine cable provided in this application has the characteristics of low loss and light weight, and is suitable for deep water and large-capacity AC submarine cable projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1A schematic diagram of the structure of a low-loss lightweight submarine cable provided in an embodiment of the present application.

[0019] Description of reference numerals:

[0020] 10-Low-loss lightweight submarine cable;

[0021] 100-power cable core; 200-optical fiber unit; 300-coating structure; 400-filling layer;

[0022] 110-conductor cluster; 120-protection structure; 210-optical unit; 220-protection structure; 310-armor layer; 320-wrapping layer; 330-lining layer; 340-outer layer;

[0023] 111-water-blocking conductor; 121-insulating layer; 122-water-blocking layer; 123-non-metallic sheath layer; 124-conductor shielding layer; 125-insulating shielding layer; 126-metal shielding layer; 311-armored monomer;

[0024] 221 - inner sheath; 222 - optical unit armor layer; 223 - tape layer; 224 - outer sheath. DETAILED DESCRIPTION

[0025] As described in the background technology, with the increase in global demand for renewable energy and the acceleration of marine resource development, the application scope of submarine cables continues to expand. Submarine cables not only play an important role in cross-sea power transmission and communication, but also play a key role in the connection of offshore wind farms and offshore oil and gas platforms. The widespread application of submarine cables has promoted the interconnection of global energy networks, supported long-distance, large-capacity power and data transmission, and has become an indispensable part of modern marine engineering and infrastructure construction.

[0026] At present, traditional submarine cables usually use copper wire as conductor. The copper wires are closely arranged and interconnected, resulting in a significant skin effect. The current is mainly concentrated at the edge of the conductor, increasing the AC resistance and loss. In addition, the armor layer of traditional submarine cables generally uses galvanized steel wire or copper wire. Although galvanized steel wire has good mechanical strength, its magnetic properties lead to high armor loss. Although copper wire has excellent corrosion resistance and low loss, its high cost limits its large-scale application. In addition, the high density of steel wire and copper wire increases the weight of the submarine cable, increases the transportation and laying costs, and increases the risk of damage.

[0027] In addition, CN217061582U discloses a tensile-resistant, anti-collision, low-loss cable, which uses a single silver-plated copper wire as the inner conductor to reduce conductor attenuation. In addition, the cable has super strong tensile strength through the silver-plated copper wire braided layer and the aramid fiber braided layer, and the polyurethane outer sheath is extruded. However, the high cost of silver-plated alloy conductors limits their large-scale application in long-length submarine cables.

[0028] CN115831483A discloses a method for manufacturing a low-loss large-section conductor and a low-loss large-section conductor, and introduces a method for manufacturing a low-loss large-section conductor. The method draws a copper rod into a round copper single wire. Afterwards, a first layer of enameled wire paint is sprayed on the outer periphery of the round copper single wire, and six layers of tile-shaped copper single wire conductors are twisted in sequence from the inside to the outside with it as the center, wherein the first to fifth layers of conductors are sprayed with enameled wire paint after twisting. The method arranges the conductor single wires closely, and the surface is smooth and round, which can ensure uniform distribution of the electric field and increase the service life of the cable. However, the enameled wire conductor does not coat the enameled layer on all the single wires.

[0029] In view of this, an embodiment of the present application provides a low-loss lightweight submarine cable, including a power cable core, an optical fiber unit, and a coating structure. The power cable core includes a conductor cluster and a protective structure coated outside the conductor cluster, the conductor cluster includes a plurality of twisted and wound water-blocking conductors, and the water-blocking conductor includes a conductor wire and an insulating film layer attached to the outer wall of the conductor wire. Among them, the insulating film layer attached to the outer wall of the conductor wire can not only provide physical protection for the conductor wire, but also effectively suppress the skin effect and proximity effect, reduce the concentrated distribution of current on the surface of the conductor wire, and reduce the AC resistance, thereby reducing the energy loss during the power transmission process and improving the transmission efficiency of the water-blocking conductor. The coating structure is coated on the periphery of the power cable core and the optical fiber unit, and the coating structure includes at least one armor layer, the armor layer includes a plurality of spirally twisted armor monomers, and the armor monomers include metal wires and a coating layer attached to the outer wall of the metal wire. In this way, by adding a coating layer outside the metal wire, the weight of the submarine cable can be significantly reduced while ensuring the bending strength and tensile strength of the submarine cable. Therefore, the low-loss lightweight submarine cable provided in this application has the characteristics of low loss and light weight, and is suitable for deep water and large-capacity AC submarine cable projects.

[0030] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0031] Figure 1 This is a schematic diagram of the structure of a low-loss lightweight submarine cable provided in an embodiment of the present application. Figure 1 As shown, the embodiment of the present application provides a low-loss light submarine cable 10. The low-loss light submarine cable 10 realizes a low-loss and lightweight design, improves power transmission efficiency, and reduces installation and maintenance costs.

[0032] The low-loss light submarine cable 10 can be used in the field of AC submarine cables of 500kV and below, and is mainly used for power transmission in offshore wind power projects with fixed wind turbines. In addition, the low-loss light submarine cable 10 has optoelectronic composite characteristics and can transmit power and communication signals at the same time, thereby enhancing the monitoring and data transmission capabilities of offshore wind farms. Its flexibility makes it not only suitable for offshore wind power projects, but also can be used in other occasions that require submarine power transmission, and has broad application potential and market prospects.

[0033] Reference Figure 1 As shown, the low-loss light submarine cable 10 includes a power cable core 100, an optical fiber unit 200 and a coating structure 300. The power cable core 100 is responsible for the efficient transmission of electric energy and can transmit electricity from the power supply end to the load end. The optical fiber unit 200 is responsible for the transmission of optical signals, providing a high-speed data transmission channel, ensuring the fast and reliable transmission of data, and meeting the needs of modern communications. The coating structure 300 is coated on the periphery of the power cable core 100 and the optical fiber unit 200, which can protect the low-loss light submarine cable 10 from physical damage caused by external mechanical forces such as friction with bottom rocks and sediments and fishing activities. At the same time, it can prevent seawater and other corrosive substances from corroding the internal structure of the low-loss light submarine cable 10, and extend the service life of the low-loss light submarine cable 10. In addition, during the laying and recovery process of the low-loss light submarine cable 10, the coating structure 300 can provide additional tensile strength to reduce the risk of breakage of the low-loss light submarine cable 10 caused by external forces.

[0034] The power cable core 100 includes a conductor cluster 110, which is composed of a plurality of twisted and wound water-blocking conductors 111. The water-blocking conductor 111 includes a conductor wire (not shown in the figure) and an insulating film layer (not shown in the figure), and the insulating film layer is attached to the outer wall of the conductor wire. The conductor wire is the core component of power transmission, and the conductor wire can be made of copper wire, aluminum wire or aluminum alloy wire, which is not specifically limited in the embodiment of the present application.

[0035] It should be noted that when multiple conductor wires are closely arranged, the electromagnetic fields between them will affect each other, resulting in proximity effect and skin effect. Therefore, this embodiment can increase the distance between conductors by coating each conductor wire with an insulating film layer, thereby reducing the influence of proximity effect and skin effect. It helps to make the current distribution in each conductor more uniform, reduce AC resistance and power loss, and improve power transmission efficiency. In addition, the insulating film layer can also enhance the mechanical strength and corrosion resistance of the conductor wire, extend the service life of the low-loss lightweight submarine cable 10, and enable it to operate efficiently and reliably in a complex marine environment.

[0036] The insulation resistivity of the insulating film layer may be greater than or equal to 400 MΩ·cm, and the thickness of the insulating film layer may be less than or equal to 300 μm. Thus, the high insulation resistivity ensures that the insulating film layer can effectively prevent current leakage and provide reliable electrical isolation. The thinner insulating film layer helps to reduce the overall size and weight of the low-loss light submarine cable 10, and can give the low-loss light submarine cable 10 greater flexibility, making it easier to bend and install.

[0037] In a possible implementation, the insulating film layer can be obtained by immersing the conductor wire in a coating solution. Specifically, first, polyethylene material is dissolved in a solution containing toluene at 60°C in an oxygen-free environment to form a coating solution, and the conductor wire is immersed in the coating solution so that the coating solution is wrapped around the outer surface of the conductor wire. Afterwards, the conductor wire wrapped with the coating solution is passed through a heating pipe, so that the coating solution forms a uniformly distributed insulating film on the surface of the conductor wire. In other words, the insulating film layer attached to the outside of the conductor wire can be a polyethylene layer.

[0038] In addition, according to the water depth and application requirements, a water-blocking filling material (not shown in the figure) may be provided in the internal gap of the conductor cluster 110. The water-blocking filling material can form a water-blocking barrier in the underwater environment, effectively preventing the intrusion of moisture, thereby ensuring the long-term stable operation and safety of the low-loss lightweight submarine cable 10.

[0039] Continue to refer to Figure 1 As shown, the power cable core 100 further includes a protective structure 120 coated outside the conductor cluster 110. The protective structure 120 includes an insulating layer 121, a water blocking layer 122 and a non-metallic sheath layer 123 arranged in sequence from the inside to the outside.

[0040] The insulating layer 121 can prevent current leakage and ensure the safe operation of the power cable core 100. Therefore, the material of the insulating layer 121 must have good electrical insulation performance, as well as appropriate mechanical strength and chemical stability. For example, the insulating material can be cross-linked polyethylene, polypropylene, and the like.

[0041] It should be noted that a conductor shielding layer 124 may be provided between the conductor cluster 110 and the insulating layer 121, and the conductor shielding layer 124 may make the interface of the conductor cluster 110 toward the insulating layer 121 as smooth as possible, thereby effectively eliminating the irregularity and tip effect of the conductor surface. This design helps to avoid excessive concentration of the electric field in a specific area, thereby reducing the problem of concentrated electric field intensity of the power cable core 100 during operation, significantly improving the electrical performance and reliability of the power cable core 100, and ensuring the long-term stable operation of the power cable core 100.

[0042] In addition, an insulating shielding layer 125 may be provided outside the insulating layer 121 to ensure that the surface of the medium between the insulating layer 121 and the water-forming layer is stable and smooth.

[0043] In a possible implementation, the conductor shielding layer 124, the insulating layer 121, and the insulating shielding layer 125 can be sequentially extruded and coated on the surface of the conductor cluster 110 by three-layer co-extrusion. In the process of three-layer co-extrusion, precise control is required to ensure that the thickness of the conductor shielding layer 124, the insulating layer 121, and the insulating shielding layer 125 are uniform, the surface is smooth, and there are no bubbles or pinholes, so as to ensure the overall performance and long-term reliability of the power cable core 100.

[0044] The water-blocking layer 122 can meet the longitudinal and radial water-blocking requirements of large water depths. The water-blocking layer 122 can expand or form a waterproof barrier when in contact with water, thereby effectively preventing moisture from flowing radially or longitudinally along the power cable core 100. Exemplarily, the material of the water-blocking layer 122 can be selected from a semiconductive water-resistant tape, which can not only meet the electrical performance requirements of the power cable core 100, but also have the functions of water blocking and buffering. In addition, the semiconductive tape can be provided with multiple layers, and the semiconductive tape can be wrapped around the outer periphery of the insulating layer 121 in an overlapping manner, with an overlapping rate of 10% to 30%. In other words, when the semiconductive water-resistant tape is wrapped around the power cable core 100, each circle will partially overlap the previous circle, and the overlapping part is 10% to 30% of the width of the semiconductive water-resistant tape. In this way, it can be ensured that the semiconductive water-resistant tape can be tightly covered on the outer surface of the insulating layer 121, thereby forming a continuous, seamless protective layer.

[0045] In a possible implementation, a metal shielding layer 126 may be provided outside the water-blocking layer 122. The metal shielding layer 126 can conduct capacitive current during normal operation and short-circuit current during short circuit, and can also effectively shield electromagnetic interference, protect the power cable core 100 from lightning strikes, and homogenize the electric field to prevent axial discharge. In addition, the metal shielding layer 126 also ensures the safe grounding of the power cable core 100 to avoid excessive losses, thereby ensuring the stable operation and long-term reliability of the power cable core 100. Exemplarily, the metal shielding layer 126 can be a structure such as an alloy lead sheath, copper wire, copper belt, aluminum-plastic composite belt, etc., and this embodiment does not specifically limit this.

[0046] The non-metallic sheath layer 123 can provide additional mechanical protection for the power cable core 100, and can resist the erosion of the power cable core 100 by the external environment, such as corrosive substances, microbial activities, etc. Therefore, the material of the non-metallic sheath layer 123 must have good flexibility, corrosion resistance, and weather resistance to adapt to different application environments. Exemplarily, the non-metallic sheath layer 123 can be an extruded semi-conductive polyethylene material.

[0047] A filling layer 400 may be provided outside the power cable core 100, and the filling layer 400 may ensure the roundness and structural stability of the low-loss light submarine cable 10. Exemplarily, the filling layer 400 may be made of a polypropylene fiber rope, which has good flexibility and water resistance, can enhance the mechanical anti-buffering performance of the low-loss light submarine cable 10, and can improve the flame retardant performance and anti-punching performance of the low-loss light submarine cable 10. Alternatively, the filling layer 400 may also use a non-hygroscopic molded filling strip. The non-hygroscopic molded filling strip has the characteristic of not absorbing moisture, which helps to improve the moisture resistance and stability of the low-loss light submarine cable 10. As long as the material can provide good support and high flame retardant performance and anti-punching performance, the present embodiment does not limit the specific material of the filling layer 400.

[0048] It should be noted that, in order to meet different power transmission requirements, there can be one or more power cable cores 100. When there are multiple power cable cores 100, a filling layer 400 is also provided between adjacent power cable cores 100. In this way, the low-loss light submarine cable 10 can be kept stable during the manufacturing and laying process, and the electrical and mechanical problems caused by the gaps between the power cable cores 100 when the low-loss light submarine cable 10 is in operation can be reduced.

[0049] The optical fiber unit 200 is disposed inside the filling layer 400, and the filling layer 400 can protect the optical fiber unit 200 from being squeezed. The optical fiber unit 200 can provide a high-speed data transmission channel, support broadband communication and Internet access, and can also be used for the status monitoring and early warning system of the low-loss light submarine cable 10.

[0050] Continue to refer to Figure 1 As shown, the optical fiber unit 200 includes an optical unit 210, and the optical unit 210 includes a plurality of optical fibers twisted together in a spiral (not shown in the figure). In order to enhance the structural stability of the optical fiber, a layer of stainless steel tube (not shown in the figure) can be provided outside the optical fiber. The design of the stainless steel tube can provide a buffer space for the optical fiber, so that the optical fiber has a certain flexibility when facing external impact or vibration. In other words, when the optical fiber encounters external impact or vibration, the optical fiber can move moderately in the stainless steel tube, thereby reducing the mechanical damage to the optical fiber, and ensuring the stability and durability of the optical fiber during the installation and use of the low-loss light submarine cable 10.

[0051] It should be noted that the optical unit 210 is an important component of the low-loss lightweight submarine cable 10, and the optical fiber inside it is extremely susceptible to moisture and humidity. Moisture and humidity entering the optical unit 210 may cause the stainless steel tube to rust, thereby affecting the performance of the optical fiber. Therefore, the optical unit 210 may also be filled with a water-blocking material (not shown in the figure). Exemplarily, the water-blocking material may be a water-blocking fiber paste or a special ointment. The water-blocking material can form a moisture-proof barrier to prevent moisture from invading the interior of the optical unit 210, thereby ensuring the transmission quality and service life of the optical unit 210.

[0052] In addition, the optical fiber unit 200 further includes a protective structure 220 covering the optical unit 210. The protective structure 220 includes an inner sheath 221, an optical unit armor layer 222, a tape layer 223 and an outer sheath 224 arranged in sequence from the inside to the outside.

[0053] The inner sheath 221 is coated on the outer periphery of the optical unit 210 to protect the optical unit 210 from damage during the armoring process, and the inner sheath 221 can resist the invasion of external corrosive media, thereby forming a primary protection for the optical fiber. The inner sheath 221 can be made of a relatively soft material, such as polyethylene or polyurethane.

[0054] The optical unit armor layer 222 can improve the compression and tension resistance of the optical fiber unit 200, and prevent the optical fiber unit 200 from being mechanically damaged during the laying or operation of the low-loss light submarine cable 10. Exemplarily, the optical unit armor layer 222 can be made of stainless steel strips or steel wires.

[0055] The tape layer 223 can be tightly wrapped around the outer periphery of the optical unit armor layer 222, and can be used to fix the optical unit armor layer 222 to prevent the optical unit armor layer 222 from loosening or shifting during the laying or operation of the low-loss light submarine cable 10. In addition, the tape layer 223 can also provide additional protection for the optical fiber unit 200 to resist external wear.

[0056] The outer sheath 224 is arranged on the outer periphery of the tape layer 223, which can protect the optical fiber unit 200 from physical damage, and the outer sheath 224 also has the characteristics of being waterproof, shear-resistant, and tensile-resistant, thereby extending the service life of the optical fiber unit 200. In addition, the outer sheath 224 also has strong impact resistance and can withstand various mechanical stresses that may be encountered during the laying of the low-loss light submarine cable 10. Exemplarily, the outer sheath 224 can be formed by winding a polypropylene rope, or the outer sheath 224 can also be formed by extruding a polyethylene bag, as long as the outer sheath 224 can be guaranteed to have good flexibility, chemical resistance, and wear resistance, and the embodiment of the present application does not impose specific restrictions on this.

[0057] Continue to refer to Figure 1As shown, the coating structure 300 is coated on the outer periphery of the power cable core 100 and the optical fiber unit 200. The coating structure 300 includes at least one armor layer 310. The armor layer 310 can provide important mechanical protection for the low-loss light submarine cable 10 to prevent the low-loss light submarine cable 10 from physical damage such as impact and extrusion during the laying and operation process. In addition, the armor layer 310 can provide the necessary tensile strength for the low-loss light submarine cable 10. When the low-loss light submarine cable 10 is stretched or bent, the armor layer 310 can withstand the main tension or pressure to protect the power cable core 100 and the optical fiber unit 200 from damage. In addition, the armor layer 310 also has excellent corrosion resistance, effectively resists the erosion of seawater, protects the power cable core 100 and the optical fiber unit 200 inside the low-loss light submarine cable 10, and thus significantly prolongs the service life of the low-loss light submarine cable 10.

[0058] Specifically, the armor layer 310 includes a plurality of spirally twisted armor monomers 311 , and the armor monomers 311 include metal wires (not shown in the figure) and a coating layer (not shown in the figure).

[0059] Metal wires are usually made of high-strength, corrosion-resistant materials to ensure durability and tensile strength in marine environments. Exemplarily, the metal wires can be made of aluminum alloy wires, which have good strength and corrosion resistance. In addition, the non-magnetic properties of aluminum alloy wires can effectively reduce or even eliminate the armor hysteresis loss of the low-loss light submarine cable 10 during operation. Of course, the lightweight properties of aluminum alloy wires also help to reduce the overall weight of the low-loss light submarine cable 10, which can reduce installation and maintenance costs, and also improve the operability and flexibility of the low-loss light submarine cable 10 in complex marine environments.

[0060] The coating layer is attached to the outer wall of the metal wire and has excellent corrosion resistance and conductive properties, which provides reliable protection for the application of the low-loss light submarine cable 10 in complex marine environments. The coating layer can be made of corrosion-resistant and wear-resistant materials to block the erosion of seawater and other corrosive substances. Exemplarily, the coating layer can be an anti-corrosion conductive layer. Among them, the salt spray corrosion rate and salt water full immersion corrosion rate of the anti-corrosion conductive layer are both less than or equal to 0.001mm / a, that is, in the harsh marine environment, the anti-corrosion conductive layer can effectively resist the erosion of salt spray and salt water, greatly extending the service life of the low-loss light submarine cable 10.

[0061] In addition, the anti-corrosion conductive layer also has excellent conductive properties, which helps to evenly distribute the current and reduce the risk of local current concentration, thereby reducing the resistance loss during the operation of the low-loss light submarine cable 10, and improving the electrical performance and transmission efficiency of the low-loss light submarine cable 10.

[0062] Compared with the current submarine cables that often use galvanized steel wire as the armor layer, the low-loss light submarine cable 10 of the present application uses aluminum alloy wire combined with a coating layer as the armor layer 310. This arrangement can reduce the weight of the low-loss light submarine cable 10 by 10%-20%, thereby simplifying the installation and maintenance process and reducing operating costs. In addition, the coating layer can also provide additional anti-corrosion protection, enhance the wear resistance and adhesion of the aluminum alloy wire, prevent wear under dynamic marine conditions, ensure the long-term reliability and performance stability of the low-loss light submarine cable 10 under harsh conditions, and enable the low-loss light submarine cable 10 to be used in large water depth applications of 3,000 meters or less.

[0063] Of course, in order to further increase the corrosion resistance and waterproofness of the low-loss light submarine cable 10, the outer surface of the armor layer 310 can also be coated with a layer of water-blocking material (not shown in the figure). Exemplarily, the water-blocking material can be asphalt material, which can effectively block the intrusion of seawater and other corrosive substances, and contribute to the stability and reliability of the low-loss light submarine cable 10 in long-term operation. In addition, the asphalt material has good adhesion and flexibility, so that when the low-loss light submarine cable 10 is bent or subjected to external pressure, the asphalt coating will not easily crack or peel off, thereby improving the adaptability of the low-loss light submarine cable 10 in complex marine environments.

[0064] In a possible implementation, the coating structure 300 may further include a wrapping layer 320 , which may be tightly wrapped around the outside of the filling layer 400 to enhance the strength and stability of the low-loss light submarine cable 10 and prevent the structure from sliding and shifting. The armor layer 310 is disposed outside the wrapping layer 320 .

[0065] For example, the wrapping layer 320 may be made of a thin, high-strength rubberized tape. In this way, the thin thickness of the rubberized tape ensures that the wrapping layer 320 does not significantly increase the overall diameter and weight of the low-loss light submarine cable 10, thereby maintaining the lightness of the low-loss light submarine cable 10. The high-strength characteristics of the wrapping layer 320 can provide excellent tensile strength and wear resistance, can effectively resist mechanical impact and wear of the external environment, and ensure the durability and reliability of the low-loss light submarine cable 10 under dynamic marine conditions.

[0066] Continue to refer to Figure 1As shown, an inner lining layer 330 may be further provided outside the wrapping layer 320, and the inner lining layer 330 is located between the wrapping layer 320 and the armor layer 310. The inner lining layer 330 may further prevent moisture penetration. In addition, since the armor layer 310 is relatively hard, the inner lining layer 330 may provide an additional barrier between the wrapping layer 320 and the armor layer 310, reduce direct friction between the wrapping layer 320 and the armor layer 310, and prevent the armor layer 310 from causing wear to the wrapping layer 320. Exemplarily, the inner lining layer 330 may be formed by winding a plurality of polypropylene fiber ropes around the outer surface of the wrapping layer 320.

[0067] In addition, the coating structure 300 may further include an outer coating layer 340, which is the outermost structure of the coating structure 300 and surrounds the armor layer 310. The outer coating layer 340 can prevent the low-loss light submarine cable 10 from physical damage such as impact or wear.

[0068] The outer layer 340 may be provided with multiple layers. For example, the outer layer 340 may be formed by winding two layers of polypropylene fiber ropes with opposite twist directions around the outside of the armor layer 310. In this way, the polypropylene fiber rope has excellent corrosion resistance and tensile strength, and can provide mechanical protection for the low-loss light submarine cable 10. The staggered twist directions help to improve the stability of the structure, prevent interlayer sliding and displacement, and make the structure more compact, reduce gaps, prevent the penetration of foreign substances, and further enhance the overall durability and reliability of the low-loss light submarine cable 10.

[0069] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-loss lightweight submarine cable, characterized in that: include: A power cable core, the power cable core comprising a conductor cluster and a protective structure coated outside the conductor cluster, the conductor cluster comprising a plurality of twisted and wound water-blocking conductors, the water-blocking conductor comprising a conductor wire and an insulating film layer attached to the outer wall of the conductor wire; Fiber Optic Unit; The coating structure is coated on the outer periphery of the power cable core and the optical fiber unit, and the coating structure includes at least one armor layer, the armor layer includes a plurality of spirally twisted armor monomers, and the armor monomers include metal wires and a coating layer attached to the outer wall of the metal wires.

2. The low-loss lightweight submarine cable according to claim 1, characterized in that: The insulation resistivity of the insulating film layer is greater than or equal to 400 MΩ·cm, and / or the thickness of the insulating film layer is less than or equal to 300 μm.

3. The low-loss lightweight submarine cable according to claim 1, characterized in that: The insulating film layer is a polyethylene layer.

4. The low-loss submarine cable according to any one of claims 1 to 3, characterized in that: The coating layer of the armored monomer is an anti-corrosion conductive layer, and the neutral salt spray corrosion rate of the anti-corrosion conductive layer is less than or equal to 0.001 mm / a, and the salt water full immersion corrosion rate is less than or equal to 0.001 mm / a.

5. The low-loss submarine cable according to any one of claims 1 to 3, characterized in that: The metal wire of the armored monomer is aluminum alloy wire.

6. The low-loss submarine cable according to any one of claims 1 to 3, characterized in that: The protective structure comprises an insulating layer, a water-blocking layer and a non-metallic sheath layer which are arranged in sequence from the inside to the outside.

7. The low-loss submarine cable according to any one of claims 1 to 3, characterized in that: At least two power cable cores are provided, a filling layer is provided between adjacent power cable cores, and the optical fiber unit is provided in the filling layer.

8. The low-loss submarine cable according to any one of claims 1 to 3, characterized in that: The optical fiber unit comprises: an optical unit and a protective structure covering the outer side of the optical unit.

9. The low-loss submarine cable according to claim 8, characterized in that: The protection structure comprises an inner sheath, an optical unit armor layer, a tape layer and an outer sheath which are arranged in sequence from the inside to the outside.

10. The low-loss submarine cable according to any one of claims 1 to 3, characterized in that: The coating structure further comprises a wrapping layer, an inner lining layer and an outer covering layer which are arranged from the inside to the outside, and the armor layer is located between the inner lining layer and the outer covering layer.

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