Dynamic submarine cable

Abstract

The invention provides a dynamic submarine cable, and belongs to the technical field of ocean engineering. The dynamic submarine cable is provided with the composite armor layer, and the composite armor layer is of a structure which is soft at the upper part and rigid at the lower part and light at the upper part and heavy at the lower part, so that the fatigue loss of the dynamic submarine cable is reduced, and partial discharge at the interface between the insulating layer and the conductor shielding layer and the insulating shielding layer is prevented; the electric field distribution between the conductor shielding layer and the insulation shielding layer is greatly optimized, and the buoyancy and bending performance of the dynamic submarine cable are improved.

Description

TECHNICAL FIELD

[0001] The application relates to a dynamic submarine cable and belongs to the technical field of ocean engineering. BACKGROUND

[0002] Traditional dynamic submarine cables are all optimized on the outer sheath and the armor layer of the dynamic submarine cable to strengthen the strength of the dynamic submarine cable and protect the electric unit core wire structure inside the dynamic submarine cable, so that the overall diameter of the dynamic submarine cable is increased, the minimum bending radius is also increased, the installation difficulty of the dynamic submarine cable is also higher, and the anti-bending ability of the reinforcing layer is weaker due to the increase of the diameter of the dynamic submarine cable, so that the dynamic submarine cable is not conducive to wide use.

[0003] The dynamic cable is in a suspended state in water for a long time, and when waves and ocean currents pass around the suspended dynamic cable, rotation is periodically shed on both sides, forming double-line vortex streets with opposite directions and regular arrangement, so that alternating hydrodynamic forces are generated on the structure surface perpendicular to the flow direction, and vortex-induced vibration occurs. If the frequency of the vortex-induced vibration is close to the integer multiple of the natural frequency of the dynamic submarine cable, resonance will occur. Therefore, the vortex-induced vibration is one of the main reasons for the fatigue damage of the dynamic submarine cable.

[0004] Due to slight defects in the manufacturing process or step changes in the conductivity of the material, slight pores or charge concentration may occur at the interface, thereby causing partial discharge. Preventing partial discharge at the interface between the insulating wire and the conductor shielding layer and the insulating shielding layer is one of the core goals of high-voltage dynamic submarine cable design, manufacturing, installation and operation and maintenance.

[0005] In order to solve the above problems, a dynamic submarine cable is needed to improve the bending performance and self-stability of the dynamic submarine cable, reduce the risk of vortex-induced vibration, and thus reduce the fatigue loss of the dynamic submarine cable; at the same time, the charge is prevented from gathering at the interface between the conductor shielding layer and the insulating layer to optimize the electric field distribution between the conductor shielding layer and the insulating layer. SUMMARY

[0006] The purpose of the application is to provide a dynamic submarine cable to reduce the fatigue loss of the cable and improve the buoyancy and bending performance of the dynamic submarine cable.

[0007] In order to achieve the above purpose, the application provides the following technical solutions: On the one hand, the application provides a dynamic submarine cable, which comprises a composite armor layer with a gravity center eccentrically arranged, the composite armor layer comprising a first armor part arranged on the side close to the seabed and a second armor part arranged on the side close to the sea surface; the density of the first armor part is higher than that of the second armor part; the first armor part comprises steel wires, and the second armor part comprises fiber wires.

[0008] Further, in some embodiments of the present application, a filler is arranged in the composite armor layer.

[0009] Further, in some embodiments of the present application, the first armor part further comprises a counterweight.

[0010] Further, in some embodiments of the present application, the steel wires and the fiber wires are arranged in a non-twisted manner along the longitudinal axis of the dynamic submarine cable respectively, and the steel wires and the fiber wires form an interlocking armor on the longitudinal axis of the dynamic submarine cable.

[0011] Further, in some embodiments of the present application, the dynamic submarine cable further comprises a cable core, a geometric center of the cable core is arranged eccentrically in the composite armor layer, and the geometric center is close to the side of the seabed.

[0012] Further, in some embodiments of the present application, the cable core comprises, from inside to outside, a conductive core, an insulating shielding layer, the conductive core comprises, from inside to outside, a conductor, a conductor shielding layer, an insulating layer, and / or At least one conductive core is arranged in the insulating shielding layer.

[0013] Further, in some embodiments of the present application, the conductor shielding layer comprises a conductive gradient material A, and the conductive gradient material A gradually decreases in conductivity from inside to outside in the conductor radial direction; and / or, The insulating shielding layer comprises a conductive gradient material B, and the conductive gradient material B gradually increases in conductivity from inside to outside in the conductor radial direction.

[0014] Further, in some embodiments of the present application, the conductive gradient material A comprises a resin matrix and a conductive filler filled in the resin matrix, and the filling proportion of the conductive filler gradually decreases from inside to outside in the radial direction of the insulating shielding layer; and / or, The conductive gradient material B comprises a foam matrix and a conductive filler filled in the foam matrix, and the filling proportion of the conductive filler gradually increases from inside to outside in the radial direction of the insulating shielding layer, or, The conductive gradient material B comprises a resin matrix, hollow glass microspheres, and a conductive filler, wherein the volume proportion of the hollow glass microspheres in the insulating shielding layer gradually increases from inside to outside in the radial direction of the insulating shielding layer. The conductive filler is selected from at least one of conductive carbon black, graphene, carbon nanotube, nano silver wire, or nano copper.

[0015] Further, in some embodiments of the present application, the inner and outer surfaces of the insulating shielding layer are subjected to smoothing treatment; and / or, The outer surface of the cable core is further coated with a wear-resistant layer.

[0016] Furthermore, in some embodiments of this application, the first armor portion covers 1 / 3 to 1 / 2 of the circumference of the cable core; and / or, The steel wires, the fiber filaments, and the locking points between the steel wires and the fiber filaments are respectively Z-shaped or S-shaped structures in the longitudinal direction of the dynamic submarine cable.

[0017] The dynamic submarine cable provided in this application has the following excellent effects: (1) The gravity center of the composite armor layer is set eccentrically, and the density of the first armor part is higher than that of the second armor part. That is, the upper light and lower heavy structure design improves the buoyancy and self-stability of the dynamic submarine cable, reduces the risk of eddy vibration, and thus reduces the fatigue loss of the dynamic submarine cable.

[0018] (2) The composite armor layer adopts a soft upper layer and a steel lower layer structure, which improves the bending performance of dynamic submarine cables.

[0019] (3) The conductor shielding layer has a structure in which the conductivity continuously decreases from the inside to the outside in the radial direction of the conductor, and the insulating shielding layer has a structure in which the conductivity continuously increases from the inside to the outside in the radial direction of the conductor. This structural design prevents the accumulation of charge at the interface where the conductor shielding layer and the insulating layer are in contact, and optimizes the electric field distribution between the conductor shielding layer and the insulating shielding layer.

[0020] (4) An insulating shielding layer containing a foam base is filled between the conductive cores, which simultaneously functions as an insulating shielding layer and a filler strip, greatly reducing the weight of the dynamic submarine cable, improving the buoyancy of the dynamic submarine cable, and also improving the bending performance of the dynamic submarine cable. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the dynamic submarine cable structure described in this application.

[0023] Figure 2 This is another structural schematic diagram of the dynamic submarine cable described in this application.

[0024] Figure 3 This is a schematic diagram of the interlocking structure of a single layer of steel wire and fiber filament in the planar unfolding structure of the composite armor layer as described in this application, formed by unfolding the composite armor layer along A.

[0025] Figure 4Structure diagram of the conductor insulation shielding system described in the present application.

[0026] Figure 5 Structure diagram of the insulation shielding layer described in the present application.

[0027] Figure 6 Structure diagram of the conductor shielding layer described in the present application.

[0028] Explanation of main element symbols: 1 - cable core, 11 - conductor, 12 - conductor shielding layer, 13 - insulation layer, 14 - insulation shielding layer, 15 - reinforcing layer, 16 - water-blocking layer, 17 - optical fiber unit, 2 - composite armor layer, 21 - filler, 221 - first fiber wire, 222 - second fiber wire, 231 - first steel wire, 232 - second steel wire, 24 - cavity, 25 - support frame, 26 - adhesive tape, 27 - counterweight, 3 - outer sheath, δ - electrical conductivity. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described below in conjunction with embodiments, obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In one aspect, the present application provides a dynamic submarine cable, comprising a composite armor layer with eccentrically arranged gravity center, the composite armor layer comprising a first armor part arranged near the seabed and a second armor part arranged near the sea surface; the density of the first armor part is higher than that of the second armor part; the first armor part comprises steel wires, and the second armor part comprises fiber wires, as shown in Figure 1

[0031] The dynamic submarine cable with eccentrically arranged gravity center is softer than the dynamic submarine cable with symmetrical design, which improves the bending performance of the dynamic submarine cable.

[0032] The structure design that the density of the first armor part near the seabed is higher than that of the second armor part near the sea surface improves the buoyancy and self-stability of the dynamic submarine cable, reduces the risk of vortex vibration, and thus reduces the fatigue loss of the dynamic submarine cable.

[0033] In some embodiments, a filler is arranged in the composite armor layer.

[0034] Specifically, the filler is a lightweight material, such as one of a foam material or a silica gel material, the silica gel material has excellent high-temperature resistance and anti-aging performance, and can maintain the stability of the cable at high temperature. ​

[0035] In the present application, the filler fills the gap between the fiber filaments and / or steel filaments.

[0036] In some embodiments, the first armored part further comprises a weight block, as shown in Figure 2

[0037] Further, the steel filaments of the first armored part and the fiber filaments of the second armored part both have an even number of layers.

[0038] The filler has the function of fixing the fiber filaments or steel filaments, forming an integral structure of the first armored part and the second armored part, and can prevent displacement of the fiber filaments or steel filaments or the weight block during use of the dynamic submarine cable, thereby ensuring that the dynamic submarine cable maintains the characteristics of being light at the top and heavy at the bottom, soft at the top and rigid at the bottom. At the same time, the filler maintains the roundness of the outer surface of the composite armored layer, thereby ensuring the roundness of the dynamic submarine cable after cabling, and also ensuring the roundness of the inner surface of the composite armored layer and the offset of the inner cavity of the composite armored layer.

[0039] In some embodiments, the filler completely fills the composite armored layer. When the composite armored layer is formed, a mold larger than the cable core is used. After the fiber filaments and steel filaments or weight blocks are arranged outside the cable core, they are placed in the mold, so that the excircle on one side of the steel filaments or weight blocks is tangent to the incircle of the mold, and then the filler is extruded in the mold, thereby forming an eccentric structure.

[0040] In some embodiments, the inner filler in the composite armored layer does not completely fill the composite armored layer, as shown in Figure 2 Specifically, the outer circle of the composite armored layer forms a support frame, which is formed of a high polymer composite material or a tubular structure formed of a metal material. After the fiber filaments and steel filaments (and / or weight blocks) are arranged longitudinally around the cable core, an adhesive tape is wound around the fiber filaments and steel filaments (and / or weight blocks) and a radial pressure is applied to fix the fiber filaments and steel filaments (and / or weight blocks) outside the cable core. The adhesive tape is a biaxially spiral wound tape structure, so that a gap is formed between each coil of the adhesive tape, and the filler can enter the gap between the fiber filaments and / or steel filaments (and / or weight blocks) in the adhesive tape. After the support frame is wrapped around the fiber filaments and steel filaments (and / or weight blocks), a cavity is formed between the adhesive tape and the support frame, and the filler fills only between 1 / 2 and 3 / 4 of the cavity, so that the filler completely fills between the steel filaments (and / or weight blocks) and partially fills the gap between the fiber filaments and the support frame. A part of the space is reserved on the upper side of the cavity, thereby forming a "Topsy-Turvy" effect of the composite armored layer, ensuring the stability of the dynamic submarine cable during the dynamic process, and avoiding damage to the internal components of the cable core caused by twisting and torsion of the dynamic submarine cable in the sea. In the case where the first armored part increases the weight block, the unfilled cavity also balances the increase in mass caused by the weight block, and does not increase the weight of the dynamic submarine cable.

[0041] ​The composite armor layer structure makes the dynamic submarine cable have bending bias, has better bending performance than the dynamic submarine cable with symmetrical structure, greatly reduces the bending radius of the dynamic submarine cable, and at the same time ensures that the dynamic submarine cable has good buoyancy. The effect of the asymmetric mass and density is the effect of the tumbler, which has a stable spatial orientation, so that the vortex shedding at different positions along the span is not synchronized, and the lift generated by the unsynchronized vortex will cancel each other out, and cannot form a strong resultant force to drive the submarine cable to resonate with a large amplitude. This greatly suppresses the strength of vortex-induced vibration from the source; even if vortex-induced vibration occurs, due to the unsynchronized vortex shedding and the reduced lift, a higher flow rate is required to reach the "locked frequency" state (i.e., the vortex shedding frequency coincides with the structural frequency), the proportion of time in the dangerous locked frequency state is greatly reduced, and the cumulative fatigue damage is also greatly reduced.

[0042] In some embodiments, the steel wires and the fiber wires are arranged in a non-twisted manner along the longitudinal axis of the dynamic submarine cable, and the steel wires and the fiber wires form interlocking armor on the longitudinal axis of the dynamic submarine cable.

[0043] Specifically, the first armor part includes 2 layers of steel wires, and the second armor part includes 2 layers of fiber wires.

[0044] Specifically, the steel wires or the weight blocks of the first armor part and the fiber wires of the second armor part are arranged longitudinally around the cable core, but are not arranged in a twisted manner around the cable core, so as to ensure that the first armor part and the second armor part always remain on opposite sides in the composite armor layer, and do not move to the other side to lose the feature of being light on the top and heavy on the bottom of the dynamic submarine cable.

[0045] However, the fiber wires and / or the steel wires are not simply arranged in parallel, but are preformed into a special interlocking structure, such as a Z shape or an S shape. The first steel wire of the first armor part and the first fiber wire of the second armor part are laid out in a plane on the circumference, as shown in Figure 3 The first armor part and the second armor part are basically laid out straight in the longitudinal direction, and each steel wire or fiber wire has a specific bending structure within the width of the straight laying, leaving a bending margin. This makes the composite armor layer avoid the problem that the twisted armor wires try to "straighten" when the submarine cable bears a large tension, thereby generating a large clamping force and a rotational torque on the cable core, and also avoids the problem of poor bending performance of parallel armor wires. The first armor part and the second armor part of the present application form a whole through the interlocking structure. Due to the interlocking structure, torque transmission is effectively suppressed, and the high radial stiffness and the anti-extrusion and anti-wear ability protect the internal structure.

[0046] Further, the second steel wire of the first armor part and the second fiber wire of the second armor part have opposite bending structure directions compared with the first steel wire of the first armor part and the first fiber wire of the second armor part in the same straight laying width of the steel wire or fiber wire, i.e. the bending wave peak of the first steel wire corresponds to the bending wave valley of the second steel wire. If the first layer of the first armor part and the second armor part is laid flat in a plane with the second layer of the first armor part and the second armor part, as shown in Figure 4 the design forms torque balance and improves the fatigue resistance of the composite armor layer.

[0047] Further, the bending radius of the single steel wire or fiber wire at the interlocking bending is at least 8 times of the diameter of the steel wire or fiber wire, so as to avoid damage or breakage when the dynamic submarine cable is bent. If the diameter of the steel wire is 4-8 mm, the bending radius of the steel wire at the wave-shaped bending can be set in the range of 32-80 mm.

[0048] In some embodiments, the dynamic submarine cable further comprises a cable core, a geometric center of the cable core is eccentrically arranged in the composite armor layer, and the geometric center is close to one side of the submarine.

[0049] The geometric center of the cable core is eccentrically arranged close to one side of the submarine, so that the filler in the second armor part is more than the filler in the first armor part; and the weight of the steel wire or the weight block of the first armor part is heavier than the weight of the fiber wire of the second armor part, so that the composite armor layer has a principle similar to a tumbler in the state of the sea surface, so that the dynamic submarine cable has good self-stabilizing performance and reduces the risk of rolling and twisting.

[0050] In some embodiments, the cable core comprises, from inside to outside, a conductive core, an insulating shielding layer, the conductive core comprises, from inside to outside, a conductor, a conductor shielding layer, an insulating layer, and / or The insulating shielding layer is provided with at least one conductive core.

[0051] In some embodiments, the conductor shielding layer comprises a conductivity gradient material A, so that the conductivity of the conductor shielding layer gradually decreases from inside to outside in the radial direction of the conductor.

[0052] In some embodiments, the insulating shielding layer comprises a conductivity gradient material B, so that the conductivity of the insulating shielding layer gradually increases from inside to outside in the radial direction of the conductor.

[0053] In some embodiments, the conductivity gradient material A comprises a resin matrix and a conductive filler filled in the resin matrix, and the filling proportion of the conductive filler gradually decreases from inside to outside in the radial direction of the insulating shielding layer.

[0054] In some embodiments, the conductivity gradient material B comprises a foam matrix and conductive fillers filled in the foam matrix, and the filling ratio of the conductive fillers increases gradually from inside to outside in the radial direction of the insulating shielding layer.

[0055] In some embodiments, the conductivity gradient material B comprises a resin matrix, hollow glass microspheres and conductive fillers, wherein the volume ratio of the hollow glass microspheres in the insulating shielding layer increases gradually from inside to outside in the radial direction of the insulating shielding layer.

[0056] In some embodiments, the conductive fillers are selected from at least one of conductive carbon black, graphene, carbon nanotubes, nano silver wires or nano copper wires.

[0057] Specifically, the resin matrix can be selected from at least one of epoxy resin, polypropylene copolymer, bimodal polyethylene or acrylic resin.

[0058] Specifically, the foam matrix is selected from at least one of polyurethane, silica gel or epoxy resin. The foam made of these resin matrices has good flexibility, structural strength and durability.

[0059] Specifically, the insulating layer adopts cross-linked polyethylene.

[0060] By setting the conductor shielding layer to have a structure in which the conductivity gradually decreases from inside to outside in the radial direction of the conductor, the charge is prevented from gathering at the interface where the conductor shielding layer contacts the insulating layer, and the electric field distribution between the conductor shielding layer and the insulating shielding layer is greatly optimized. Similarly, by setting the insulating shielding layer to have a structure in which the conductivity gradually increases from inside to outside in the radial direction of the conductor, the electric field between the insulating layer and the insulating shielding layer is optimized, and the charge at the interface of the insulating layer can be quickly introduced into the insulating shielding layer, preventing the occurrence of partial discharge.

[0061] Further, when the conductivity gradient material B comprises a foam matrix and conductive fillers, the conductive fillers are uniformly mixed with the foaming material before foaming extrusion, the conductive fillers are filled between the foam pores, and the higher the density of the foam pores, the fewer the conductive fillers, and thus the lower the conductivity. Therefore, during the foaming process, the density of the foam pores gradually decreases from inside to outside, thereby realizing the gradual increase of the conductivity of the insulating shielding layer from inside to outside in the radial direction of the conductor.

[0062] Further, when the conductivity gradient material B comprises a resin matrix, conductive fillers and hollow glass microspheres, the hollow glass microspheres can ensure the compactness of the resin matrix itself, thereby ensuring the strength of the insulating shielding layer and improving the lightweight of the dynamic submarine cable.

[0063] In the present application, the conductivity gradient can be achieved by controlling the volume fraction of hollow glass beads in the insulating shielding layer. Specifically, the conductivity gradient is adjusted by controlling the density distribution of hollow glass beads or the diameter distribution of hollow glass beads. Since hollow glass beads do not have conductivity, the greater the density or the greater the diameter of hollow glass beads in the resin matrix containing conductive materials, the lower the conductivity. Therefore, when the diameters of hollow glass beads are the same, the density of hollow glass beads is set to decrease from the inside to the outside in the radial direction of the conductor; or the diameter of hollow glass beads is set to decrease from the inside to the outside in the radial direction of the conductor, so as to realize the gradual increase of the conductivity of the insulating shielding layer structure from the inside to the outside in the radial direction of the conductor.

[0064] In the present application, the insulating shielding layer with a foam matrix fills between the conductive cores, simultaneously having the functions of the insulating shielding layer and the filling strip, and greatly reducing the weight of the dynamic submarine cable and improving the buoyancy of the dynamic submarine cable.

[0065] In the present application, the conductive shielding layer adopts a dense resin matrix to ensure the smooth interface between the conductive shielding layer and the conductor and the support performance of the conductor. Through the lightweight design of the insulating shielding layer, the mass of the dynamic submarine cable is reduced and the buoyancy of the dynamic submarine cable is improved.

[0066] In some embodiments, the foam matrix is a closed-cell foam material.

[0067] The closed-cell foam material has high mechanical strength, good thermal insulation and cushioning. By controlling the size and density of the porosity, the continuous and gradual conductivity of the insulating shielding layer is realized.

[0068] In some embodiments, the inner and outer surfaces of the insulating shielding layer including the foam matrix are subjected to smoothing treatment, including but not limited to densification treatment or hot-pressing smoothing treatment on the surfaces thereof.

[0069] Since the foam substrate has a surface that is not smooth, the inner and outer surfaces of the insulating shielding layer are subjected to smoothing treatment, so as to ensure the smooth interface with the insulating layer, form a continuous and uniform path, and avoid partial discharge.

[0070] In some embodiments, the outer surface of the cable core is also coated with a wear-resistant layer, including but not limited to a nano-ceramic coating, a polyurethane coating, and the like.

[0071] Since the dynamic submarine cable will continuously bend and swing under the action of waves and ocean currents, not only external wear and tear will occur, but also fretting wear caused by the sticking and sliding of internal elements of the cable. By setting a wear-resistant layer on the outer surface of the cable core, a buffer and isolation are formed, reducing the friction between the composite armor layer and the cable core, and at the same time, the edges of hard materials such as steel wires are also avoided from cutting or wearing the cable core when the cable is bent.

[0072] Specifically, the thickness of the wear-resistant layer is not specifically limited here and can be set according to actual conditions, such as the wear-resistant environment, such as water depth, tides and other dynamic factors.

[0073] In some embodiments, a reinforcing layer is formed outside the insulating shielding layer by hot pressing, which can enhance the compression strength of the cable core.

[0074] In some embodiments, a water-blocking layer is further provided outside the reinforcing layer to prevent seawater from eroding and corroding the cable core.

[0075] In some embodiments, the first armored portion covers 1 / 3 to 1 / 2 of the circumference of the cable core.

[0076] In some embodiments, the steel wires, the fiber wires, and the twisted portions of the steel wires and the fiber wires are in Z-shaped structures or S-shaped structures in the longitudinal direction of the dynamic submarine cable.

[0077] The steel wire armor is arranged at a position covering 1 / 3 to 1 / 2 of the circumference of the cable core, which helps to achieve a low center of gravity, thereby ensuring that the dynamic submarine cable has good stability and can automatically return to normal after tilting.

[0078] The steel wires, the fiber wires, and the twisted portions of the steel wires and the fiber wires are in Z-shaped structures or S-shaped structures in the longitudinal direction of the dynamic submarine cable, so that the steel wires, the fiber wires, and the twisted portions of the steel wires and the fiber wires are more tightly twisted.

[0079] In some embodiments, the fiber wire can be a single wire or multiple wires, and the fiber wire is selected from at least one of a carbon fiber wire, a PE fiber wire, or an aramid fiber wire. That is, the fiber wire can be a single or multiple pure carbon fiber wire, a pure PE strip, or a pure aramid fiber wire, or an interval combination of at least two of them.

[0080] The fiber wire has extremely high tensile strength as an armored wire, while having low density, which can significantly reduce the overall structural weight, and good bending performance and good moisture resistance.

[0081] Further, the fiber wire is further provided with a fiber tube filled with a shear thickening fluid arranged at intervals with the fiber wire, which compensates for the shortcoming of pure fiber wire in strong tensile ability but weak impact resistance. The shear thickening fluid has a viscosity that increases significantly with increasing shear rate when subjected to impact, thereby forming a temporary high-resistance structure that effectively absorbs and disperses impact energy. The fiber tube as a carrier of the armored wire, combined with the shear thickening fluid, can achieve multifunctional integration, which helps to reduce the overall weight and simplify the design, and also prolongs the service life of the cable or optical cable by reducing micro-damage caused by impact.

[0082] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dynamic submarine cable, characterized in that, The composite armor layer includes a gravity center eccentrically positioned composite armor layer, the composite armor layer including a first armor part disposed near the seabed and a second armor part disposed near the sea surface; the density of the first armor part is higher than the density of the second armor part; the first armor part includes steel wires and the second armor part includes fiber filaments.

2. The dynamic submarine cable according to claim 1, characterized in that, The composite armor layer contains filler.

3. The dynamic submarine cable according to claim 1, characterized in that, The first armor section also includes a counterweight.

4. The dynamic submarine cable according to claim 1, characterized in that, The steel wire and the fiber filament are respectively arranged in a non-twisted manner along the longitudinal axis of the dynamic submarine cable, and the steel wire and the fiber filament form an interlocking armor on the longitudinal axis of the dynamic submarine cable.

5. The dynamic submarine cable according to any one of claims 1-4, characterized in that, The dynamic submarine cable also includes a cable core, the geometric center of which is eccentrically located in the composite armor layer, and the geometric center is located on the side closer to the seabed.

6. The dynamic submarine cable according to claim 5, characterized in that, The cable core, from the inside out, comprises a conductive core and an insulating shielding layer; the conductive core, from the inside out, comprises a conductor, a conductor shielding layer, and an insulating layer; and / or, The insulating shielding layer contains at least one conductive core.

7. The dynamic submarine cable according to claim 6, characterized in that, The conductor shielding layer comprises a conductivity-gradient material A, wherein the conductivity of the conductor shielding layer gradually decreases from the inside to the outside in the radial direction of the conductor; and / or, The insulating shielding layer includes a conductivity-gradient material B, wherein the conductivity of the insulating shielding layer gradually increases from the inside to the outside in the radial direction of the conductor.

8. The dynamic submarine cable according to claim 7, characterized in that, The conductivity gradient material A comprises a resin matrix and conductive fillers filled in the resin matrix, with the filling ratio decreasing from the inside to the outside in the radial direction of the insulating shielding layer; and / or, The conductivity-gradient material B comprises a foam matrix and conductive fillers filled in the foam matrix, with the filling ratio increasing radially from the inside to the outside of the insulating shielding layer, or... The conductivity gradient material B includes a resin matrix, hollow glass microspheres, and conductive fillers, wherein the volume ratio of the hollow glass microspheres in the insulating shielding layer increases from the inside to the outside in the radial direction of the insulating shielding layer. The conductive filler is selected from at least one of conductive carbon black, graphene, carbon nanotubes, silver nanowires, or copper nanowires.

9. The dynamic submarine cable according to claim 6, characterized in that, The inner and outer surfaces of the insulating shielding layer are smoothed; and / or, The outer surface of the cable core is also coated with a wear-resistant layer.

10. The dynamic submarine cable according to claim 5, characterized in that, The first armored portion covers 1 / 3 to 1 / 2 of the circumference of the cable core; and / or, The spaces between the steel wires, between the fiber filaments, and where the steel wires and fiber filaments are locked together are Z-shaped or S-shaped structures in the longitudinal direction of the dynamic submarine cable.

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