High-performance wet-type dynamic submarine cable

Abstract

The invention relates to the technical field of submarine cables, in particular to a high-performance wet-type dynamic submarine cable which comprises a conductor, and a filling strip, a cabling wrapping tape, an inner sheath, an armor and an outer sheath are sequentially arranged on the outer side of the conductor from inside to outside. According to the high-performance wet-type dynamic submarine cable, the compressed circular copper oxide water-blocking conductor is adopted, the insulating layer is arranged on the surface of the copper conductor, the skin effect of the conductor is reduced, and the current-carrying capacity can be improved; the armoring is a double-layer reverse armoring, an inner layer bonding and outer layer non-bonding structure is adopted, through reverse twisting, torsion generated in the twisting process of the cable is effectively counteracted, so that the knotting and fracture risks caused by torsion in the laying and using processes of the cable are remarkably reduced, the anti-pressure capability and the dynamic flexibility are balanced through the layered design, and the service life of the cable is prolonged. The sliding frequency and the abrasion risk of outer-layer steel wires are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of submarine cables, and in particular to a high-performance wet dynamic submarine cable. Background Art

[0002] Existing wet dynamic submarine cables need to withstand complex mechanical stresses and corrosive environments in the marine environment, and are prone to problems such as fatigue damage and corrosion under dynamic conditions, affecting the service life and reliability of the cables. At the same time, with the development of offshore wind power towards the deep sea, the requirement for current-carrying capacity has also become higher. However, due to the skin effect, the effective electrical cross-section of the conductor is smaller than the physical cross-section, resulting in a significant decrease in the actual current-carrying capacity of the cable. At the same time, the existing wet dynamic submarine cables cannot monitor the temperature, humidity, and pressure changes inside them during use, resulting in higher difficulty and cost for their later maintenance. Summary of the Invention

[0003] The technical problems to be solved by the present invention are as follows: Existing wet dynamic submarine cables are prone to problems such as fatigue damage and corrosion under dynamic conditions, affecting the service life and reliability of the cables; the actual current-carrying capacity is not high, and at the same time, the temperature, humidity, and pressure changes inside them cannot be monitored, resulting in higher difficulty and cost for their later maintenance.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A high-performance wet dynamic submarine cable, including a conductor. Outside the conductor, a filling strip, a cabling tape, an inner sheath, an armor, and an outer sheath are sequentially arranged from the inside to the outside. The conductor sequentially includes a copper oxide conductor, a conductor shield, a water-tree resistant insulating layer, an insulation shield, an inner semi-conductive water-resistant tape, copper wires, a copper tape, an outer semi-conductive water-resistant tape, an aluminum-plastic composite tape, and a semi-conductive PE sheath from the inside to the outside. A central filling is provided inside the conductor. A light unit is installed inside the filling strip. An external detection unit is provided at the connection end of the outer sheath.

[0005] The conductors are evenly distributed around the central filling, and the filling strips are symmetrically arranged on both sides of the conductor.

[0006] The filling strip is designed with a hollow structure. An expansion opening is provided on the outside of the central hollow section of the filling strip, and the light unit is arranged inside the central hollow section.

[0007] A middle filling block is provided inside the central hollow section of the filling strip.

[0008] Inner limiting blocks for limiting the middle filling block are staggeredly arranged on the inner walls on both sides of the expansion opening of the filling strip, and limiting grooves matching the inner limiting blocks are staggeredly opened on both sides of the outer wall of the middle filling block.

[0009] An external mounting groove is provided on the outer side surface of the inner limiting block, and a pressure sensing module and an embedded humidity sensing module that cooperate with the external detection unit are fixedly installed in the external mounting groove from the inside to the outside.

[0010] A temperature sensing module that cooperates with the external detection unit is installed inside the filling strip at the telescopic opening.

[0011] The external detection unit includes an external housing fixed to the connection end of the outer sheath, an annular electric drive centrifugal fan installed inside the external housing, an inner arc-shaped flow guide cover fixed to the assembly surface of the external housing, an outer arc-shaped flow guide cover fixed to the outer wall of the external housing, and a telescopic closing housing.

[0012] The telescopic closing housing is installed at the air outlet position of the connection end between the outer arc-shaped flow guide cover and the external housing.

[0013] The pressure sensing module is an elastic and telescopic conduit structure, and one end of the pressure sensing module is fixedly installed with a pressure sensor.

[0014] The beneficial effects of the present invention are as follows: (1) A high-performance wet dynamic submarine cable of the present invention uses a tightly pressed round copper oxide water-blocking conductor, and the copper conductor surface has an insulating layer, which reduces the skin effect of the conductor and helps to improve the current-carrying capacity; (2) The armor is double-layer reverse armor, adopting an inner layer bonding + outer layer non-bonding structure. Through reverse stranding, the torsion generated during the stranding process of the cable is effectively offset, thereby significantly reducing the risk of knotting and breaking of the cable caused by torsion during laying and use. By means of hierarchical design, the compressive capacity and dynamic flexibility are balanced, and the sliding frequency and wear risk of the outer layer steel wire are reduced; (3) Non-magnetic metal wires are used for the armor, which reduces the eddy current loss and improves the current-carrying capacity. Both the inner and outer layers use non-magnetic steel wire armor; (4) A self-healing polymer coating is used on the outer sheath surface. When the coating is damaged, the microcapsules in the coating rupture to release the repair agent to repair the damage, which not only improves the corrosion resistance and waterproof performance of the cable, extends the service life of the cable, but also significantly improves the durability and reliability of the outer sheath; (5) By installing a pressure sensing module, an embedded humidity sensing module and a temperature sensing module that cooperate with the external detection unit inside the filling strip, the temperature, humidity and pressure changes inside the submarine cable are monitored in real time through a reasonable structural layout, and the internal condition of the submarine cable can be detected in time, thereby reducing the later maintenance difficulty and cost. Description of the Drawings

[0015] The present invention will be further described below with reference to the drawings and embodiments.

[0016] Figure 1It is a schematic structural diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0018] Figure 3 It is a schematic structural diagram of the external detection unit in the present invention. Detailed implementation manners

[0019] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only schematically showing the basic structure of the present invention, so they only show the components related to the present invention.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0021] Figure 1 , Figure 2 and Figure 3 A high-performance wet dynamic submarine cable shown in [drawings] includes a conductor. A filling strip 1, a cable wrapping tape 2, an inner sheath 3, an armor 4, and an outer sheath 5 are sequentially arranged outside the conductor from the inside to the outside. The conductor sequentially includes a copper oxide conductor 6, a conductor shield 7, a water tree resistant insulation layer 8, an insulation shield 9, an inner semiconductive water resistant tape 10, copper wires 11, a copper tape 12, an outer semiconductive water resistant tape 13, an aluminum-plastic composite tape 14, and a semiconductive PE sheath 15 from the inside to the outside. A central filling 16 is arranged inside the conductor. An optical unit 17 is installed inside the filling strip 1. An external detection unit 18 is arranged at the connection end of the outer sheath 5.

[0022] The conductor is a compact round water resistant copper oxide conductor 6. A layer of conductor shield 7 and a water tree resistant insulation layer 8 are extruded on the surface of the copper oxide conductor 6, which not only plays a water blocking role, but also reduces the skin effect of the conductor and improves the current carrying capacity. The adjacent conductor gaps are filled with water blocking materials.

[0023] The conductor shield 7, the water tree resistant insulation layer 8, and the insulation shield 9 adopt a three-layer coextrusion process. The three-layer coextrusion process reduces the interlayer defects, ensures the electrical and mechanical properties of the cable, improves the production efficiency, and reduces the production cost at the same time. The insulation uses water tree resistant insulation, which can effectively prevent the generation of water trees and further improve the electrical insulation performance of the cable.

[0024] The longitudinal water-blocking buffer layer is formed by winding the outer semiconductive water-blocking tape 13 to limit the infiltration of seawater along the cable when the cable is damaged. The metal shield is loosely wound with copper wires 11, and a copper tape 12 is wound outside the copper wires 11, which has good electrical performance. The longitudinally wrapped aluminum-plastic composite tape 14 is used as the radial waterproof layer to enhance the waterproof and anti-corrosion functions.

[0025] A semiconductive PE sheath 15 material is extruded outside the radial water-blocking layer, which has good electrical and mechanical properties. When the three-core cable is stranded, the optical cable unit is placed into the filling strip 1 and stranded together with the wire cores to protect the optical cable from extrusion and deformation. The filling strip 1 uses a semiconductive material, which establishes an electrical channel between the wire core and the optical unit 17, realizes the equipotential of the wire core and the optical fiber, and reduces the risk of optical fiber heating. The inner sheath 3 uses an HDPE sheath, which has better corrosion resistance and waterproof performance.

[0026] The armor 4 is a double-layer reverse armor, adopting an inner layer bonded + outer layer non-bonded structure.

[0027] The inner layer is a short pitch bonded armor. Both the inner and outer layer armors are changed to non-magnetic steel wires. The epoxy resin is used for fixation, which can provide compressive support and fix the relative positions of the non-magnetic steel wires, reducing the inner layer sliding. The outer layer adopts a non-bonded design, allowing free sliding to adapt to dynamic deformation, and at the same time restricting the overall displacement amplitude through the inner layer. The outer layer is made of stainless steel wires, and the surface is coated with a polyurethane coating, and the wear rate can be greatly reduced compared with the traditional design.

[0028] Through the reverse twisting of the inner and outer layer steel wires, the torsion generated during the stranding process of the cable is effectively offset, thus significantly reducing the risk of knotting and breaking of the cable caused by torsion during laying and use. This design not only enhances the anti-torsion ability of the cable, but also improves its stability and reliability in a dynamic environment.

[0029] By means of a layered design, the compressive capacity and dynamic flexibility are balanced, reducing the sliding frequency and wear risk of the outer layer steel wires. At the same time, non-magnetic metal wires are used as the armor 4, reducing the eddy current loss and increasing the current-carrying capacity. Both the inner and outer layers adopt non-magnetic steel wire armors.

[0030] The outer sheath 5 also uses an HDPE sheath material, which not only has good corrosion resistance and mechanical properties, but also has certain wear resistance and can withstand the impact of the marine environment. A self-healing polymer coating based on polyurethane or epoxy resin is used on its surface, with microcapsules embedded. When the coating is damaged, the microcapsules break and release the repair agent, and the repair agent reacts with the surrounding environment or the matrix to form a new polymer network, thus repairing the damage. It not only improves the corrosion resistance and waterproof performance of the cable, extends the service life of the cable, but also significantly improves the durability and reliability of the outer sheath.

[0031] To enhance the internal structural strength and improve the utilization rate of the internal space, the conductors are evenly distributed around the center filling 16, and the filling strips 1 are symmetrically arranged on both sides of the conductors.

[0032] To reduce the overall mass, the filling strip 1 is designed with a hollow structure. An expansion opening is provided on the outer side of the central hollow section of the filling strip 1, and the optical unit 17 is arranged inside the central hollow section.

[0033] To facilitate installation and enhance the internal support force of the filling strip 1, a central filling block 19 is arranged inside the central hollow section of the filling strip 1.

[0034] To improve the assembly firmness and stability, inner limiting blocks 20 for limiting the central filling block 19 are arranged on the inner walls of both sides of the expansion opening of the filling strip 1 in a staggered manner, and limiting grooves matching the inner limiting blocks 20 are provided on both sides of the outer wall of the central filling block 19 in a staggered manner.

[0035] By inserting the inner limiting blocks 20 into the limiting grooves, the central filling block 19 can be firmly arranged inside the central hollow section of the filling strip 1.

[0036] To cooperate with the monitoring of pressure and humidity, an external installation groove is provided on the outer side of the inner limiting block 20. A pressure sensing module 21 and an embedded humidity sensing module 22 that cooperate with the external detection unit 18 are fixedly installed in the external installation groove from the inside to the outside.

[0037] The embedded humidity sensing module 22 is designed with an open structure and can directly export the internal humidity for rapid monitoring.

[0038] To cooperate with the monitoring of the internal temperature, a temperature sensing module 23 that cooperates with the external detection unit 18 is installed inside the filling strip 1 at the position inside the expansion opening.

[0039] The internal temperature is conducted using a copper tube.

[0040] To cooperate with pneumatic detection, the external detection unit 18 includes an external housing 181 fixed to the connection end of the outer sheath 5, an annular electric drive centrifugal fan 182 installed inside the external housing 181, an inner arc-shaped air deflector 183 fixed to the assembly surface of the external housing 181, an outer arc-shaped air deflector 184 fixed to the outer wall of the external housing 181, and a telescopic closing housing 185.

[0041] A temperature sensor or a humidity sensor is installed inside the inner arc-shaped air deflector 183 and the outer arc-shaped air deflector 184 according to the installation method. When the inner arc-shaped air deflector 183 and the outer arc-shaped air deflector 184 are connected to the embedded humidity sensing module 22, a humidity sensor is installed; when the inner arc-shaped air deflector 183 and the outer arc-shaped air deflector 184 are connected to the temperature sensing module 23, a temperature sensor is installed.

[0042] To cooperate with the improvement of safety, the telescopic closing cover 185 is installed at the air outlet position of the connection end between the outer arc-shaped deflector 184 and the outer cover 181.

[0043] Once water enters the inside of the connection end between the outer arc-shaped deflector 184 and the outer cover 181, at this time, by activating the sliding lock on the outer side of the outer cover 181, the outer side of the telescopic closing cover 185 is limited, and at this time, the telescopic closing cover 185 cannot extend outwards, thus closing the air outlet.

[0044] The sliding lock is installed on the outer side of the outer cover 181 and is usually limited by a lock tongue controlled by an electromagnet. The electromagnet is controlled by a water immersion switch. Once it conducts electricity and starts after getting wet, it first briefly closes the annular electric drive centrifugal fan 182, causing the telescopic closing cover 185 to elastically retract. Then the electromagnet is energized, and a spring is used to control the contraction of the lock tongue. At this time, the sliding lock cannot be limited and slides towards the telescopic closing cover 185 and gets stuck on the outer side of the telescopic closing cover 185. At this time, the telescopic closing cover 185 at this position cannot extend outwards anymore.

[0045] By fixedly connecting and communicating one end opening of the inner arc-shaped deflector 183 with the temperature sensing module 23, the air inside the temperature sensing module 23 can be extracted when the annular electric drive centrifugal fan 182 rotates at a high speed, and then it is introduced into one end opening of the adjacent temperature sensing module 23 through the outer arc-shaped deflector 184, and the air is introduced into the connected temperature sensing module 23. By analogy, a circulating flow path is formed; by fixedly connecting and communicating one end opening of the inner arc-shaped deflector 183 with the embedded humidity sensing module 22, the air inside the embedded humidity sensing module 22 can be extracted when the annular electric drive centrifugal fan 182 rotates at a high speed, and then it is introduced into one end opening of the adjacent embedded humidity sensing module 22 through the outer arc-shaped deflector 184, and the air is introduced into the connected embedded humidity sensing module 22. By analogy, a circulating flow path is formed.

[0046] Both ends of the temperature sensing module 23 are fixedly connected and communicated with the inner arc-shaped deflector 183 and the outer arc-shaped deflector 184 on the outer cover 181 at the corresponding positions respectively to form a circulating flow path; both ends of the temperature sensing module 23 are fixedly connected and communicated with the inner arc-shaped deflector 183 and the outer arc-shaped deflector 184 on the outer cover 181 at the corresponding positions respectively to form a circulating flow path.

[0047] To cooperate with the real-time monitoring of the change of external pressure, the pressure sensing module 21 is an elastic and telescopic conduit structure, and one end of the pressure sensing module 21 is fixedly installed with the pressure sensor 24.

[0048] By adopting an elastic and scalable catheter structure design, external pressure will squeeze the internal air, thereby increasing the internal air pressure. Then the pressure sensor 24 located at one end can sense the change in internal pressure. Through the transmission of the pressure change, the position where it bends or is squeezed can be judged. Then the detection data is transmitted to the remote terminal by using the data sensing unit of the existing technology. The pressure sensor 24 is connected to the data sensing unit inside the outer housing 181. The pressure sensing module 21 is set to the maximum outer diameter and can only contract inward and then elastically extend outward to reset, but it cannot continue to expand outward with the same volume. This catheter is of the existing technology.

[0049] Inspired by the above ideal embodiments of the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-performance wet dynamic submarine cable, comprising a conductor, characterized in that: The outer side of the conductor is provided with a filling strip (1), a cabling tape (2), an inner sheath (3), an armor (4) and an outer sheath (5) in sequence from the inside to the outside. The conductor comprises, in sequence from the inside to the outside, a copper oxide conductor (6), a conductor shield (7), an anti-water tree insulation layer (8), an insulation shield (9), an inner semi-conductive water-resistant tape (10), a copper wire (11), a copper tape (12), an outer semi-conductive water-resistant tape (13), an aluminum-plastic composite tape (14) and a semi-conductive PE sheath (15). A central filling (16) is provided on the inner side of the conductor. An optical unit (17) is installed inside the filling strip (1). An external detection unit (18) is provided at the connection end of the outer sheath (5).

2. A high-performance wet dynamic submarine cable according to claim 1, characterized in that: The conductors are evenly distributed around the central filler (16), and the filling strips (1) are symmetrically arranged on both sides of the conductor.

3. A high performance wet dynamic submarine cable according to claim 1, characterized in that: The filling strip (1) adopts a hollow structure design, a telescopic opening is provided on the outside of a central hollow section of the filling strip (1), and the light unit (17) is arranged on the inside of the central hollow section.

4. A high-performance wet dynamic submarine cable according to claim 3, characterized in that: A middle filling block (19) is arranged inside the central hollow section of the filling strip (1).

5. A high-performance wet dynamic submarine cable according to claim 4, characterized in that: Inner limiting blocks (20) for limiting the middle filling block (19) are staggeredly arranged on the inner walls on both sides of the telescopic opening of the filling strip, and limiting grooves matching the inner limiting blocks (20) are staggeredly opened on both sides of the outer wall of the middle filling block (19).

6. A high performance wet dynamic submarine cable according to claim 5, characterized in that: An external mounting groove is provided on the outer side surface of the inner limit block (20), and a pressure sensing module (21) and an embedded humidity sensing module (22) which match the external detection unit (18) are respectively fixedly mounted in the external mounting groove from the inside to the outside.

7. A high performance wet dynamic submarine cable according to claim 6, characterized in that: A temperature sensing module (23) matching with the external detection unit (18) is installed inside the filling strip (1) and located inside the telescopic opening.

8. A high-performance wet dynamic submarine cable according to claim 7, characterized in that: The external detection unit (18) comprises an external cover shell (181) fixed to the connection end of the outer sheath (5), an annular electric-driven centrifugal fan (182) installed inside the external cover shell (181), an inner arc-shaped air guide cover (183) fixed to the assembly surface of the external cover shell (181), an outer arc-shaped air guide cover (184) fixed to the outer wall of the external cover shell (181), and a telescopic closed cover shell (185).

9. A high-performance wet dynamic submarine cable according to claim 8, characterized in that: The telescopic closed cover (185) is installed at the air outlet position of the connection end between the outer arc-shaped air guide cover (184) and the outer cover (181).

10. A high performance wet dynamic submarine cable according to claim 8, characterized in that: The pressure sensing module (21) is an elastic and retractable catheter structure, and one end of the pressure sensing module (21) is fixedly mounted on the pressure sensor (24).

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