Dynamic submarine cable and method for forming dynamic submarine cable

Abstract

The present application provides a dynamic submarine cable and a molding method for the dynamic submarine cable. The dynamic submarine cable includes an optical unit and a plurality of cable cores, and an inner sheath, an armor layer and an outer sheath are arranged in order from the inside to the outside, surrounding the optical unit and the plurality of cable cores, the plurality of cable cores form a triangular structure, and two adjacent cable cores abut against each other, and the cable core includes an aluminum alloy conductor unit, a conductor shield layer, an insulating layer and an insulating shield layer arranged in order from the inside to the outside, the aluminum alloy conductor unit includes a plurality of conductor layers and a water-stopping adhesive arranged between two adjacent conductor layers, and each conductor layer includes a plurality of conductor solid wires. The technical means of the present application has better water-stopping performance and fatigue performance, so that the service life of the dynamic submarine cable can be extended.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on June 30, 2022, bearing application number 202210761675.2 and entitled "Dynamic submarine cable and method for forming dynamic submarine cable."

[0002] This application relates to the technical field of submarine cables, and more particularly to dynamic submarine cables and methods for forming dynamic submarine cables. [Background technology]

[0003] In recent years, with the development of low-carbonization, the accumulated wind energy reserves in China's waters with a depth of 50 meters or more have exceeded 1,268 GW, accounting for more than 60% of the total offshore wind energy. However, these waters present difficulties in installing fixed-pile wind turbines. To meet the enormous clean energy needs of China's economically developed coastal provinces, floating wind power is the optimal means for China's future wind power development. Most international maritime powers have rapidly extended their continental slopes into the deep sea. To access better wind resources, dynamic submarine cables are often used to depths of 1,000 meters. At the same time, the weight and size of the individual dynamic submarine cables for large-capacity transmission are becoming increasingly large.

[0004] Currently, with the development of floating wind power generation, the dynamic submarine optical / electrical composite submarine cable connecting the floating structure and underwater equipment has a problem of short service life due to its poor watertightness and fatigue performance at great depths. Summary of the Invention [Means for solving the problem]

[0005] The main object of the present application is to provide a dynamic submarine cable and a method for forming the same, which solves the problem of dynamic submarine cables in the prior art, namely, that their service life is short due to poor watertight performance and fatigue performance at great depths.

[0006] In order to achieve the above object, according to one aspect of the present application, there is provided a dynamic submarine cable comprising an optical unit and a plurality of cable cores, wherein an inner sheath, an armor layer and an outer sheath are arranged in this order from the inside to the outside surrounding the optical unit and the plurality of cable cores, the plurality of cable cores form a triangular structure, and two adjacent cable cores abut each other, the cable core comprises an aluminum alloy conductor unit, a conductor shield layer, an insulating layer and an insulating shield layer arranged in this order from the inside to the outside, the aluminum alloy conductor unit comprises a plurality of conductor layers and a watertight adhesive arranged between two adjacent conductor layers, and each conductor layer comprises a plurality of solid conductor wires.

[0007] Furthermore, the conductor solid wire is an aluminum alloy solid wire, the strength of the conductor solid wire is 305 MPa to 330 MPa, and the conductor solid wire is subjected to an annealing treatment.

[0008] Furthermore, the pitch of each conductor layer and the outer diameter of the conductor layer are 10D A ≦h≦16D A and D A is the outer diameter of the conductor layer, and h is the pitch of the conductor layer.

[0009] Furthermore, multiple conductor wires are stranded together in a non-compacted stranding manner to form an aluminum alloy conductor unit, and each conductor layer contains 6n conductor wires, and the outer diameter of each conductor layer is D A =(2n+1)d, where n is the number of conductor layers and d is the diameter of the conductor wire.

[0010] Furthermore, the cable core further includes a metal shield layer provided on the outer periphery of the insulating shield layer, and the metal shield layer includes two copper tapes provided radially spaced apart and a semiconductive waterproof tape provided between the two copper tapes.

[0011] Furthermore, the dynamic submarine cable further includes a filling structure, which is provided between two adjacent cable cores, one side of which has a contact surface that fits the outer wall surface of the cable core, and the other side of which has an accommodating groove for accommodating an optical unit.

[0012] Furthermore, there are three cable cores and three filling structures, each of which is provided with a plurality of accommodating grooves, and each of which is provided with an optical unit.

[0013] Furthermore, the armor layer is made of twisted flat steel wires, there are multiple armor layers, and the twisting directions of the flat steel wires of two adjacent armor layers are opposite to each other.

[0014] Furthermore, asphalt or asphalt paint is applied to the outer periphery of the armor layer, or PP rope is wound around the outer periphery of the armor layer.

[0015] The cable core further includes a first semiconductive buffer tape positioned inside the metal shielding layer and a second semiconductive buffer tape positioned outside the metal shielding layer.

[0016] According to one aspect of the present application, there is provided a method for forming a dynamic submarine cable, the method comprising the steps of: manufacturing a cable core to include, in order from the inside to the outside, an aluminum alloy conductor unit, a conductor shield layer, an insulating layer, and an insulating shield layer, wherein the aluminum alloy conductor unit includes a plurality of conductor layers and a watertight adhesive provided between two adjacent conductor layers, and each conductor layer includes a plurality of conductor solid wires; providing the plurality of cable cores to form a triangular structure; performing a process for manufacturing an optical unit; and providing an inner sheath, an armor layer, and an outer sheath, in order from the inside to the outside, surrounding the optical unit and the plurality of cable cores.

[0017] Furthermore, the step of manufacturing the cable core further includes a step of forming a plurality of conductor layers by twisting a plurality of conductor solid wires together in a non-compression concentric twisting manner to form a plurality of conductor layers, and a step of pressing the outermost conductor layer.

[0018] Furthermore, the molding method further includes a step of applying asphalt or asphalt paint to the outer periphery of the armor layer, or a step of winding a PP rope around the outer periphery of the armor layer.

[0019] By applying the technical solution of this application, the aluminum alloy waterstop conductor adopts a circular non-compression design, which can alleviate the problem of plastic hardening of the aluminum alloy structure and extend the fatigue life of the aluminum alloy conductor. By filling the gap between two adjacent conductor layers with waterstop adhesive, the aluminum alloy conductor unit can form a tight entity, and the waterstop adhesive can improve the waterstop performance of the gaps between multiple conductor single strands. At the same time, when subjected to bending tensile loads, the waterstop adhesive can also reduce frictional stress and damage between adjacent conductor single strands, which can extend the service life of dynamic submarine cables when they are located at great depths. In addition, the conductor shield layer, insulating layer and insulating shield layer form a three-layer co-extrusion structure, and the conductor shield layer reduces the local electric field concentration caused by the uneven surface formed when the aluminum alloy conductor units are twisted together, thereby ensuring a uniform electric field distribution on the surface of the aluminum alloy conductor units. The insulating layer can play an insulating role, and the insulating shield layer is used to shield the electric field. That is, by providing the insulating shield layer, there is no distribution of power lines outside the insulating shield layer, which can avoid gaps between the inside and outside of the insulating shield layer and reduce the impact of insulation strength on dynamic submarine cables. [Brief explanation of the drawings]

[0020] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the illustrative examples and descriptions thereof are intended to aid in the interpretation of the application and do not constitute undue limitations on the application.

[0021] [Figure 1] 1 is a structural diagram of an embodiment of a dynamic submarine cable according to the present application; [Figure 2] FIG. 2 is a structural diagram of an aluminum alloy conductor unit of the dynamic submarine cable of FIG. 1. [Figure 3] FIG. 2 is a side view of the metallic shield layer of the dynamic submarine cable of FIG. 1. [Figure 4] 1 is a flowchart of a method for forming a dynamic submarine cable according to the present application. DETAILED DESCRIPTION OF THE INVENTION

[0022] In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless they are inconsistent. The present invention will be described in detail below in combination with the embodiments with reference to the accompanying drawings.

[0023] 1 to 3, an embodiment of the present application provides a dynamic submarine cable. The dynamic submarine cable includes an optical unit 12 and a plurality of cable cores 21, an inner sheath 15, an armor layer 22, and an outer sheath 20 arranged in this order from the inside to the outside, surrounding the optical unit 12 and the plurality of cable cores 21, the plurality of cable cores 21 forming a triangular structure, two adjacent cable cores 21 abutting each other, the cable core 21 including an aluminum alloy conductor unit 27, a conductor shield layer 5, an insulating layer 6, and an insulating shield layer 7 arranged in this order from the inside to the outside, the aluminum alloy conductor unit 27 including a plurality of conductor layers 23 and a watertight adhesive 2 arranged between two adjacent conductor layers 23, and each conductor layer 23 including a plurality of conductor solid wires 1.

[0024] In the above technical solution, there are three cable cores 21, and two adjacent cable cores 21 abut to form a triangular structure, and the optical unit 12 and the three cable cores 21 are spaced apart. A watertight adhesive 2 is filled between two adjacent conductor layers 23, allowing the aluminum alloy conductor unit 27 to form a tight entity. The watertight adhesive 2 can improve the watertight performance of the gaps between the multiple conductor single wires 1. At the same time, when subjected to bending tensile loads, the watertight adhesive 2 can also reduce frictional stress and damage between adjacent conductor single wires 1, thereby extending the service life of the dynamic submarine cable when it is located at great depths. In addition, the conductor shield layer 5, the insulating layer 6 and the insulating shield layer 7 form a three-layer co-extrusion structure. When the aluminum alloy conductor units 27 are twisted together, an uneven surface is formed, which causes local electric field concentration. However, by providing the conductor shield layer 5, the local electric field concentration on the aluminum alloy conductor unit 27 is reduced, thereby ensuring that the electric field distribution on the surface of the aluminum alloy conductor unit 27 is uniform. The insulating layer 6 can play an insulating role, and the insulating shield layer 7 is used to shield the electric field. That is, by providing the insulating shield layer 7, there is no distribution of power lines outside the insulating shield layer 7. This avoids gaps between the inside and outside of the insulating shield layer 7 and reduces the impact of insulation strength on dynamic submarine cables.

[0025] By configuring it as described above, the dynamic submarine cable has excellent water-stopping performance and tensile strength, and can meet the strength requirements at great depths, thereby extending the service life of the dynamic submarine cable and ensuring the transmission of power and communications even when the dynamic submarine cable is faced with a large displacement of the floating wind turbine or severe shaking caused by the effects of a typhoon.

[0026] Preferably, the conductor solid wire 1 is a high-strength aluminum alloy solid wire 6201-T81, which must have a strength of 305 MPa to 330 MPa. Compared with a copper solid wire, an aluminum alloy solid wire has a higher specific strength underwater. This means that a dynamic submarine cable using an aluminum alloy solid wire can meet the tensile strength requirements with a smaller cross-sectional area, and at the same time, the weight of the dynamic submarine cable itself can be reduced, allowing the dynamic submarine cable to meet the strength requirements at great depths. At the same time, mechanical stress on the conductor solid wire 1 can be removed by subjecting the conductor solid wire 1 to annealing treatment.

[0027] Preferably, the outer sheath 20 is made of a low density or high density polyethylene material, depending on the flexibility and watertightness requirements of the dynamic submarine cable application.

[0028] In the present embodiment, the waterproofing performance of the aluminum alloy conductor unit 27 can be further improved by sequentially wrapping a waterproof tape 3 and a semiconductive binding tape 4 around the outside of the aluminum alloy conductor unit 27. A three-layer co-extrusion structure formed by a conductive shield layer 5, an insulating layer 6, and an insulating shield layer 7 is provided on the outer periphery of the semiconductive binding tape 4.

[0029] In the present embodiment, the pitch of each conductor layer 23 and the outer diameter of the conductor layer 23 are 10D A ≦h≦16D A where D A is the outer diameter of the conductor layer, and h is the pitch of the conductor layer.

[0030] The "pitch" means the distance that the conductor solid wires 1 move in one rotation in the axial direction of the stranding (i.e., the axial length of the cable core 21). The aluminum alloy conductor unit 27 thus provided has higher tensile strength.

[0031] Preferably, the pitch of each conductor layer 23 is 13.5 times the outer diameter of the conductor layer.

[0032] In the embodiment of the present application, a plurality of conductor wires 1 are twisted together in a non-compression twisting manner to form an aluminum alloy conductor unit 27, and each conductor layer 23 includes 6n conductor wires 1, and the outer diameter D A =(2n+1)d, where n is the number of conductor layers and d is the diameter of the conductor wire.

[0033] In the above technical solution, n is a natural number, and a nano-mold is used as a mold for twisting the aluminum alloy conductor unit 27. The inner diameter size of the mold is equal to the outer diameter D of each conductor layer 23. A This makes it possible to alleviate plastic hardening of the aluminum alloy structure and extend the fatigue life of the aluminum alloy conductor unit 27.

[0034] In the embodiment of the present application, the waterproof adhesive 2 must be in a paste form before filling, and is thermosetting, becoming an elastomer after curing, which can reduce frictional stress and damage between the conductor single wires 1 due to bending tensile loads.

[0035] Preferably, the water-stopping adhesive 2 has high temperature resistance, does not drip at 130°C, and has a volume resistivity of 1×10 5 It is a semi-conductive waterproof adhesive with a resistance of Ω·cm or less.

[0036] As shown in Figures 1 and 3, in the embodiment of the present application, the cable core 21 further includes a metal shielding layer 9 provided on the outer periphery of the insulating shielding layer 7, and the metal shielding layer 9 includes two copper tapes 91 provided radially spaced apart and a semiconductive waterproof tape 92 provided between the two copper tapes 91.

[0037] In the above technical solution, the metal shielding layer 9 includes two copper tapes 91, which can increase the short-circuit current and simultaneously allow the charging current and circulating current of the line to flow. A first semiconductive buffer tape 8 and a second semiconductive buffer tape 10 are respectively provided on the inside and outside of the metal shielding layer 9. During the copper tape winding process, the copper tape 91 presses against the adjacent buffer tape. By providing the semiconductive waterproof tape 92, the copper tape 91 presses against the semiconductive waterproof tape 92 when wound. This allows the semiconductive waterproof tape 92 to perform a waterproofing function in the axial direction of the aluminum alloy conductor unit 27. At the same time, the semiconductive waterproof tape 92 also relieves the pressure of the metal shielding layer 9 on the three-layer co-extrusion structure, ensuring the safety of electrical operation. On the other hand, during the process of repeated stretching and bending of the submarine cable, the semiconductive waterproof tape 92 reduces the mutual friction between the two copper tapes 91, improves the dynamic fatigue performance of the cable core 21, and avoids the problem of damage or even failure of the copper tape 91 due to mutual friction between the two copper tapes 91, thereby improving the fatigue life of the copper tape 91.

[0038] As shown in FIG. 1, in an embodiment of the present application, the dynamic submarine cable further includes a filling structure 13, which is disposed between two adjacent cable cores 21, and one side of the filling structure 13 is provided with a contact surface 25 that fits the outer wall surface of the cable core 21, and the other side of the filling structure 13 is provided with an accommodating groove 26 for accommodating the optical unit 12.

[0039] By providing the filling structure 13 as described above, the gap between two adjacent cable cores 21 can be filled, which prevents the multiple cable cores 21 from moving relative to each other when the dynamic submarine cable is significantly displaced or violently shaken, ensuring the stability of the use of the dynamic submarine cable. At the same time, providing the filling structure 13 can improve the roundness of the dynamic submarine cable and increase the lateral pressure resistance of the cable cores 21. Furthermore, by placing an optical unit outside the filling structure 13, functions such as optical signal transmission and online monitoring can be realized.

[0040] As shown in Figure 1, in the embodiment of the present application, there are three cable cores 21 and three filling structures 13, each filling structure 13 has a plurality of accommodating grooves 26, and each accommodating groove 26 has an optical unit 12 provided therein.

[0041] In the above technical solution, each filling structure 13 is provided with two receiving grooves 26 (not shown in FIG. 1), so that each filling structure 13 can accommodate two optical units 12 .

[0042] By configuring as described above, two optical units 12 can be simultaneously wired and formed into a cable by modifying the vertical cable forming equipment, so that the operator can select the number of optical units 12 to be arranged according to the actual usage needs.

[0043] In one embodiment of the present application, the filling structure 13 is made of PP plastic or PE plastic, or both PP plastic and PE plastic, which can increase the lateral pressure resistance of the cable core 21 and at the same time protect the optical unit 12 from bending.

[0044] Preferably, according to different application scenarios, materials such as calcium carbonate, silicon dioxide, etc. can be added to the filling structure 13 in the material molding process to improve the strength of the filling structure 13.

[0045] As shown in FIG. 1, in the embodiment of the present application, the armor layer 22 is made by twisting together flat steel wires, and there are multiple armor layers 22, and the twisting directions of the flat steel wires of two adjacent armor layers 22 are opposite to each other.

[0046] In the above technical solution, there are two armor layers 22, and the flat steel wires of the two armor layers 22 are twisted in opposite directions, which satisfies the torque balance design and allows the flat steel wires of the two armor layers 22 to receive uniform force during the tensioning process, thereby improving the strength of the dynamic submarine cable and at the same time improving the bending rigidity of the dynamic submarine cable. After the two armor layers 22 are twisted together, the flat steel wires need to be chamfered to make the armor layer 22 dense.

[0047] By providing the armor layer 22 as described above, the armor layer 22 is made of flat steel wires, and the flat steel wires are mainly in surface contact with each other. This improves the abrasion resistance of the armor layer 22 provided in this manner, and also reduces the outer diameter of the flat steel wires. This allows the outer diameter of the entire dynamic submarine cable to be reduced, making transportation and installation easier.

[0048] Preferably, the pitch of each armor layer 22 is 14 to 15 times the outer diameter of the armor layer 22 .

[0049] Preferably, there may be four armor layers 22.

[0050] As shown in FIG. 1, in the embodiment of the present application, the outer periphery of the armor layer 22 is coated with asphalt or asphalt paint.

[0051] By providing as described above, under dynamic environmental loads, the asphalt or asphalt paint can prevent and reduce the wear of the armor layer 22, thereby further extending the service life of the dynamic submarine cable under deep water, heavy weight and severe environmental loads.

[0052] As shown in FIG. 1, in the embodiment of the present application, a PP rope 17 is wound around the outer periphery of the armor layer 22.

[0053] By providing it as described above, the PP rope can tightly bind the flat steel wires of the armor layer 22, which can further improve the fatigue resistance of the dynamic submarine cable.

[0054] In the embodiment of the present application, an anticorrosion layer 11 is also provided on the outer periphery of the second semiconductive buffer tape 10. The anticorrosion layer 11 has radial water-stopping properties, which can prevent internal corrosion of the dynamic submarine cable and further extend the service life of the dynamic submarine cable.

[0055] As shown in FIG. 4, an embodiment of the present application provides a method for forming a dynamic submarine cable, the method comprising:

[0056] a step of manufacturing a cable core 21 to include an aluminum alloy conductor unit 27, a conductor shield layer 5, an insulating layer 6, and an insulating shield layer 7, which are arranged in this order from the inside to the outside, wherein the aluminum alloy conductor unit 27 includes a plurality of conductor layers 23 and a watertight adhesive 2 arranged between two adjacent conductor layers 23, and each conductor layer 23 includes a plurality of conductor solid wires 1;

[0057] providing a plurality of cable cores 21 in a triangular configuration;

[0058] performing a process for manufacturing the optical unit 12;

[0059] and providing the inner sheath 15, the armor layer 22 and the outer sheath 20 in that order from the inside to the outside, surrounding the optical unit 12 and the plurality of cable cores 21.

[0060] In the above technical solution, a special adhesive application device is used to apply a waterproof adhesive 2 to the outer periphery of each conductor layer 23, three cable cores 21 form a triangular structure, an optical unit 12 is located in the gap outside the cable cores 21, and an inner sheath 15, an armor layer 22 and an outer sheath 20 are wrapped around the outer periphery of the cable cores 21 and the optical unit 12 to form a dynamic submarine cable.

[0061] In the present embodiment, the step of manufacturing the cable core 21 includes:

[0062] A step of twisting a plurality of conductor single wires 1 together by a non-compression concentric twisting method to form a plurality of conductor layers 23;

[0063] The method further includes a step of pressing the outermost conductor layer 23.

[0064] In the above technical solution, multiple conductor wires 1 are twisted together using a non-compression regular concentric twisting method to form multiple conductor layers 23, and a rubber band is added to the outer circumference of each conductor layer 23 to uniformly apply a waterproof adhesive 2, and the outermost conductor layer 23 is pressed to make the outermost layer of the aluminum alloy conductor unit 27 more rounded so as to meet the requirements of the subsequent three-layer extrusion process, and in this step, the outer diameter of the aluminum alloy conductor unit 27 must not be reduced by more than 3%.

[0065] In the embodiment of the present application, in the step of twisting the aluminum alloy conductor unit 27, the increment k of the mass or resistance of the aluminum alloy conductor unit 27 per unit length is a function of the twisting coefficient m, and the increment function of the mass or resistance is k=100(m-1).

[0066] In the above technical solution, m is the twisting factor, L is the developed length of the conductor single wire 1 after one turn in the twisting axis direction, and m=L / h.

[0067] Of course, the twisting factor m may be the ratio of the mass (or resistance) of the aluminum alloy conductor unit 27 per unit length to the mass (or resistance) of a solid conductor of the same cross-sectional area.

[0068] By providing as described above, when designing aluminum alloy conductor units 27 with different cross-sectional areas, the twisting coefficient can be adjusted and the increment changed based on the number of layers of different conductor layers 23, so that the aluminum alloy conductor unit 27 can meet the DC resistance requirements of the conductor.

[0069] In the embodiment of the present application, when manufacturing the cable core 21, the rated loss factors of the aluminum alloy conductor units 27 with different numbers of layers are as follows:

[0070] Rated loss factor of aluminum alloy conductor unit [Table 1]

[0071] In the above technical solutions, the number of single wires means the total number of conductor single wires 1 in the aluminum alloy conductor unit 27, and the rated loss factor is the minimum loss factor of the aluminum alloy conductor unit 27 in the manufacturing and design process, that is, the ratio between the actually measured breaking strength of the aluminum alloy conductor unit and the theoretically calculated breaking strength.

[0072] In an embodiment of the present application, the molding method further includes the step of applying asphalt or asphalt paint to the outer periphery of the armor layer 22 to prevent and reduce abrasion of the armor layer 22.

[0073] In the embodiment of the present application, the forming method further includes a step of winding a PP rope around the outer periphery of the armor layer 22 to tightly bind the flat steel wires of the armor layer 22, thereby further improving the fatigue resistance of the dynamic submarine cable.

[0074] As can be seen from the above description, the above embodiments of the present application achieve the following technical effects: the aluminum alloy waterstop conductor adopts a circular, non-compression design, which can alleviate the problem of plastic hardening of the aluminum alloy structure and extend the fatigue life of the aluminum alloy conductor; a waterstop adhesive is filled between two adjacent conductor layers, which allows the aluminum alloy conductor unit to form a tightly packed entity; the waterstop adhesive can improve the waterstop performance of the gaps between multiple conductor single strands; and at the same time, the waterstop adhesive can also reduce the frictional stress and damage between adjacent conductor single strands when subjected to bending tensile loads, thereby extending the service life of dynamic submarine cables when located at great depths. The conductor shield layer, insulating layer, and insulating shield layer form a three-layer co-extrusion structure. The conductor shield layer reduces localized electric field concentrations caused by the uneven surface formed when the aluminum alloy conductor units are twisted together, thereby ensuring a uniform electric field distribution on the surface of the aluminum alloy conductor units. The insulating layer serves an insulating role and shields the electric field. That is, the insulating shield layer eliminates power lines from being distributed outside the insulating shield layer, thereby avoiding gaps between the inside and outside of the insulating shield and thereby reducing the impact on the insulation strength of the dynamic submarine cable. The semiconductive waterstop tape reduces mutual friction between the two copper tapes and improves the dynamic fatigue performance of the cable core. The filling structure improves the roundness of the dynamic submarine cable and increases the cable core's lateral pressure resistance. The flat steel wires in the two armor layers can be subjected to uniform force, thereby improving the strength of the dynamic submarine cable. The asphalt or asphalt paint prevents and reduces wear on the armor layer.

[0075] The above is only a preferred embodiment of the present application, and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application. [Explanation of symbols]

[0076] Here, the above drawings include the following drawing symbols:

[0077] 1, solid conductor wire, 2, waterproof adhesive, 3, waterproof tape, 4, semi-conductive binding tape, 5, conductor shield layer, 6, insulating layer, 7, insulating shield layer, 8, first semi-conductive buffer tape, 9, metal shield layer, 91, copper tape, 92, semi-conductive waterproof tape, 10, second semi-conductive buffer tape, 11, corrosion protection layer, 12, optical unit, 13, filling structure, 15, inner sheath, 17, PP rope, 20, outer sheath, 21, cable core, 22, armor layer, 23, conductor layer, 25, contact surface, 26, accommodation groove, 27, aluminum alloy conductor unit.

Claims

1. The cable includes an optical unit (12) and a plurality of cable cores (21), wherein an inner sheath (15), an armor layer (22), and an outer sheath (20) are arranged in this order from the inside to the outside, surrounding the optical unit (12) and the plurality of cable cores (21), the plurality of cable cores (21) forming a triangular structure, with two adjacent cable cores (21) abutting each other, the cable core (21) including an aluminum alloy conductor unit (27), a conductor shield layer (5), an insulating layer (6), and an insulating shield layer (7) arranged in this order from the inside to the outside, the aluminum alloy conductor unit (27) including a plurality of conductor layers (23) and a waterproof adhesive (2) arranged between two adjacent conductor layers (23), each of the conductor layers (23) including a plurality of solid conductor wires (1), The cable core (21) further includes a metal shielding layer (9) provided on the outer periphery of the insulating shielding layer (7), a first semiconductive buffer tape (8) located inside the metal shielding layer (9), and a second semiconductive buffer tape (10) located outside the metal shielding layer (9).

2. 2. The dynamic submarine cable according to claim 1, wherein the conductor single wire (1) is an aluminum alloy single wire, the strength of the conductor single wire (1) is 305 MPa to 330 MPa, and the conductor single wire (1) is subjected to an annealing treatment.

3. The pitch of each conductor layer (23) and the outer diameter of the conductor layer (23) are 10D Ａ ≦h≦16D Ａ Meet the conditions of D Ａ 2. The dynamic submarine cable according to claim 1, wherein: is the outer diameter of the conductor layer; and h is the pitch of the conductor layer.

4. A plurality of the conductor wires (1) are twisted together in a non-compression twisting manner to form the aluminum alloy conductor unit (27), and each of the conductor layers (23) contains 6n of the conductor wires (1), and the outer diameter D of each of the conductor layers (23) is Ａ 2. The dynamic submarine cable according to claim 1, wherein n is the number of conductor layers and d is the diameter of a single conductor wire.

5. A dynamic submarine cable as described in claim 1, characterized in that the metal shielding layer (9) includes two copper tapes (91) arranged radially spaced apart and a semi-conductive water-stopping tape (92) arranged between the two copper tapes (91).

6. 6. The dynamic submarine cable according to claim 1, further comprising a filling structure (13) provided between two adjacent cable cores (21), one side of the filling structure (13) being provided with a contact surface (25) that fits onto an outer wall surface of the cable core (21), and the other side of the filling structure (13) being provided with an accommodation groove (26) for accommodating the optical unit (12).

7. 7. The dynamic submarine cable according to claim 6, wherein the number of said cable cores (21) and said filling structures (13) is three, each of said filling structures (13) is provided with a plurality of accommodating grooves (26), and each of said accommodating grooves (26) is provided with said optical units (12).

8. The dynamic submarine cable according to any one of claims 1 to 5, characterized in that the armor layer (22) is made by twisting together flat steel wires, the armor layer (22) is plural, and the twisting directions of the flat steel wires in two adjacent armor layers (22) are opposite to each other.

9. The outer periphery of the armor layer (22) is coated with asphalt or asphalt paint, or A dynamic submarine cable according to any one of claims 1 to 5, characterized in that a PP rope (17) is wound around the outer periphery of the armor layer (22).

10. A method for forming a dynamic submarine cable, comprising the steps of: a step of manufacturing a cable core (21) to include an aluminum alloy conductor unit (27), a conductor shield layer (5), an insulating layer (6), and an insulating shield layer (7) arranged in this order from the inside to the outside, wherein the aluminum alloy conductor unit (27) includes a plurality of conductor layers (23) and a waterproof adhesive (2) arranged between two adjacent conductor layers (23), each of the conductor layers (23) including a plurality of conductor solid wires (1), and the cable core (21) further includes a metal shield layer (9) arranged on the outer periphery of the insulating shield layer (7), a first semiconductive buffer tape (8) located inside the metal shield layer (9), and a second semiconductive buffer tape (10) located outside the metal shield layer (9); Providing a plurality of said cable cores (21) to form a triangular structure; performing a process for manufacturing an optical unit (12); and providing an inner sheath (15), an armor layer (22) and an outer sheath (20) in that order from the inside to the outside, surrounding the optical unit (12) and the plurality of cable cores (21).

11. The step of manufacturing a cable core (21) comprises: a forming step of a plurality of conductor layers by twisting a plurality of the conductor single wires (1) together in a non-compression concentric twisting manner to form a plurality of the conductor layers (23); 11. The method for forming a dynamic submarine cable according to claim 10, further comprising the step of: pressing the outermost conductor layer (23).

12. and / or applying asphalt or asphalt paint to the outer periphery of the armor layer (22). The method for forming a dynamic submarine cable according to claim 10, further comprising the step of winding a PP rope (17) around the outer periphery of the armor layer (22).

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