Ultrahigh-voltage large-capacity three-core submarine cable
By combining a multi-layered structure with intelligent sensors, the mechanical performance, insulation performance, and corrosion resistance of submarine cables in the seabed environment have been solved, achieving efficient fault monitoring and reducing operation and maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGDONG UNIV OF TECH
- Filing Date
- 2026-02-06
- Publication Date
- 2026-05-29
AI Technical Summary
Existing ultra-high voltage, high-capacity three-core submarine cables have problems such as insufficient compressive strength, poor insulation performance, weak corrosion resistance, poor resistance to biofouling, susceptibility to external damage, and limited ability to resist environmental changes in the seabed environment. Moreover, existing operation and maintenance technologies cannot meet actual needs.
The cable employs a multi-layered structural design, including conductive cores, optical cables, coated tape layers, PP rope inner lining layers, armor layers, PP rope outer lining layers, and protective adhesive layers. Combined with nano-anti-corrosion coatings, epoxy resin-based nano-silver coatings, lead alloy sheaths, water-blocking conductors, and intelligent sensors, it enhances the mechanical properties, insulation properties, corrosion resistance, and anti-bioadhesion capabilities of the submarine cable, and enables intelligent monitoring.
It improves the tensile, compressive, and bending properties of submarine cables, enhances insulation performance and corrosion resistance, reduces microbial adhesion, enables real-time fault monitoring, and lowers operation and maintenance costs.
Smart Images
Figure CN122117534A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of submarine cable technology, specifically to an ultra-high voltage, high-capacity three-core submarine cable. Background Technology
[0002] The ultra-high voltage, high-capacity three-core submarine cable has the following potential structural defects in the existing technology: First, submarine cables are usually laid on the seabed at depths of hundreds or even thousands of meters, where the water pressure is extremely high. 500KV submarine cables bear such pressure for a long time, and some internal structures may gradually deform, affecting cable performance and requiring improvement in compressive strength. Second, in terms of insulation, under the action of DC voltage, the space charge in the insulation of ordinary cross-linked polyethylene cables will concentrate at certain points, causing excessively high local field strength and breakdown. While additives can mitigate space charge accumulation, technical challenges remain; thirdly, insufficient corrosion resistance: seawater is highly corrosive, and the cable sheath is easily eroded over time. Once the sheath is damaged, the internal wiring may be exposed, affecting signal transmission and even causing communication interruptions; fourthly, weak resistance to marine organism attachment: some marine organisms can attach to the cable surface, increasing the cable's burden and potentially affecting its normal operation, but existing submarine cable structures may be inadequate in addressing such issues; fifthly, susceptibility to external damage: 500KV submarine cables are typically laid on the seabed, and ship anchors and fishing gear can cause external damage. Since their routes are often tens of kilometers or even longer, locating the fault point and carrying out salvage and repair is difficult and time-consuming, resulting in significant economic losses and social impact; sixthly, limited resistance to environmental changes: seabed geological activities such as earthquakes and submarine volcanic eruptions may cause the cable to be stretched and compressed, leading to serious problems such as cable breakage. Simultaneously, ocean currents can expose and suspend the cable, increasing its risk of external damage and mechanical wear from suspension.
[0003] In addition, as the voltage level and laying length of submarine cables continue to increase, the existing 500kV cross-linked polyethylene insulated submarine cable operation and maintenance technology cannot meet the actual needs, which also reflects that its structural design may lack sufficient consideration for the convenience of long-term operation and maintenance. Summary of the Invention
[0004] The purpose of this invention is to provide an ultra-high voltage, high-capacity three-core submarine cable with strong corrosion resistance and resistance to biofouling.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An ultra-high voltage, high-capacity three-core submarine cable includes three conductive cores, two optical fibers, an adhesive-coated tape layer, a PP rope inner liner layer, an armor layer, a PP rope outer liner layer, and a protective adhesive layer. The protective adhesive layer is located around the outer PP rope liner layer, which is located around the armor layer. The armor layer is located around the inner PP rope liner layer, which is located around the adhesive-coated tape layer. The adhesive-coated tape layer is formed by wrapping the adhesive tape around the three conductive cores and two optical fibers to bind them together. It is equipped with a filler strip; the conductive core includes a water-blocking conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a semi-conductive water-blocking binding tape layer, an alloy lead sheath, and a PE outer sheath. The PE outer sheath is located around the alloy lead sheath, and the alloy lead sheath is located around the semi-conductive water-blocking binding tape layer. The semi-conductive water-blocking binding tape layer is formed by winding semi-conductive tape on the surface of the insulation shielding layer. The insulation shielding layer is located around the insulation layer, the insulation layer is located around the conductor shielding layer, and the conductor shielding layer is located around the water-blocking conductor. The surface of the protective adhesive layer is provided with an anti-corrosion and anti-bioadhesion layer.
[0006] Furthermore, the anti-corrosion and anti-bioadhesion layer includes a nano-anti-corrosion coating and an epoxy resin-based nano-silver coating. The nano-anti-corrosion coating is applied to the surface of the protective adhesive layer, and after the anti-corrosion coating dries, the epoxy resin-based nano-silver coating is applied. The mass percentage content of silver in the epoxy resin-based nano-silver coating is 0.20%–0.40%.
[0007] Experiments have shown that in marine environments, coatings with a silver content of 0.30% significantly reduce microbial adhesion, while silver content below 0.20% results in insufficient anti-corrosion and anti-biological capabilities due to low silver content; and silver content above 0.40% weakens corrosion resistance due to decreased bonding.
[0008] Furthermore, the alloy lead sleeve is made of lead alloy material and is made into a corrugated sleeve through an extrusion process. The sleeve is tightly fitted onto the outside of the semiconducting resistive water binding tape layer, and a leakage current sensor is installed inside the sleeve.
[0009] Furthermore, the water-blocking conductor is made of multiple strands of water-blocking wire twisted together. The water-blocking wire includes aluminum alloy wire and a water-blocking tape, with the tape wrapped around the surface of the aluminum alloy wire. A temperature sensor and a stress sensor are installed inside the water-blocking conductor. The temperature sensor monitors the conductor temperature in real time to prevent insulation aging due to excessive temperature. The stress sensor monitors the stress on the conductor and issues an early warning when the stress is abnormal. The aluminum alloy wire used in the water-blocking conductor has high conductivity and tensile strength, effectively withstanding the tension of the submarine cable during laying and operation, while reducing the weight of the submarine cable and facilitating laying.
[0010] Furthermore, the insulation layer uses a novel composite insulation material with a thickness of 34 mm. This material is made by mixing cross-linked polyethylene (XLPE) with nano-level insulating additives. The nano-level insulating additives are nano-cellulose with a mass percentage content of 4-7%. The nano-level insulating additives can effectively inhibit the accumulation of space charge, improve the insulation performance of the insulation layer under DC voltage, and enhance the mechanical strength and heat resistance of the insulation layer.
[0011] Furthermore, the conductor shielding layer is made of a semi-conductive shielding material with a thickness of 2.0 mm.
[0012] Furthermore, the insulating shielding layer is made of a semi-conductive shielding material with a thickness of 1.8 mm.
[0013] Furthermore, the armor layer is made of galvanized steel wire rings.
[0014] Furthermore, the thickness of the inner lining layer of the PP rope is 3.0 mm; the thickness of the outer lining layer of the PP rope is 6.0 mm.
[0015] Furthermore, the optical cable is a 48-core optical cable.
[0016] The beneficial effects of this invention are as follows: 1. Improved mechanical performance: The multi-strand high-strength aluminum alloy conductors and lead alloy sheath corrugated structure enhance the tensile, compressive and bending resistance of the submarine cable, effectively resisting damage from external forces such as ship anchors and fishing gear, as well as the effects of seabed geological activities and ocean current erosion.
[0017] 2. Optimized insulation performance: The new composite insulation material and multi-layer co-extrusion process improve the insulation performance and mechanical strength of the insulation layer, while the nano-level insulation additives inhibit the accumulation of space charge and reduce the risk of insulation breakdown.
[0018] 3. Enhanced corrosion resistance and anti-biofouling ability: The nano-anti-corrosion coating and biomimetic anti-biofouling coating effectively prevent seawater corrosion and marine organism adhesion, extending the service life of the submarine cable.
[0019] 4. Comprehensive intelligent monitoring functions: Temperature sensors, stress sensors, and leakage current sensors enable real-time monitoring of conductor temperature, stress, and sheath insulation conditions of submarine cables, facilitating timely detection of potential faults and reducing operation and maintenance costs. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the structure of the present invention.
[0021] In the diagram: 1. Conductive core; 2. Optical cable; 3. Coated tape layer; 4. PP rope inner lining layer; 5. Armor layer; 6. PP rope outer lining layer; 7. Filler strip; 8. Water-blocking conductor; 9. Conductor shielding layer; 10. Insulation layer; 11. Insulation shielding layer; 12. Semi-conductive water-blocking binding tape layer; 13. Alloy lead sheath; 14. PE outer sheath; 15. Protective adhesive layer; 16. Anti-corrosion and anti-bioadhesion layer. Detailed Implementation
[0022] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.
[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper surface," "lower surface," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "forward," "reverse," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0024] like Figure 1 As shown, an ultra-high voltage, high-capacity three-core submarine cable includes three conductive cores 1, two optical cables 2, an adhesive tape layer 3, a PP rope inner lining layer 4, an armor layer 5, a PP rope outer lining layer 6, and a protective adhesive layer 15. The protective adhesive layer 15 is located around the outer PP rope lining layer 6, which is located around the armor layer 5. The armor layer 5 is located around the inner PP rope lining layer 4, which is located around the adhesive tape layer 3. The adhesive tape layer 3 is formed by wrapping the adhesive tape around the three conductive cores 1 and the two optical cables 2 to bind them together. A filler strip 7 is provided between the three conductive cores 1 and the two optical cables 2. The surface of the protective adhesive layer 15 is provided with an anti-corrosion and anti-bioadhesion layer 16. The anti-corrosion and anti-bioadhesion layer 16 includes a nano-anti-corrosion coating and an epoxy resin-based nano-silver coating. The nano-anti-corrosion coating is coated on the surface of the protective adhesive layer 15. After the anti-corrosion coating dries, the epoxy resin-based nano-silver coating is then coated. The mass percentage content of silver in the epoxy resin-based nano-silver coating is 0.20% to 0.40%.
[0025] Experiments have shown that in marine environments, coatings with a silver content of 0.30% significantly reduce microbial adhesion, while silver content below 0.20% results in insufficient anti-corrosion and anti-biological capabilities due to low silver content; and silver content above 0.40% weakens corrosion resistance due to decreased bonding.
[0026] In this embodiment, the optical cable 2 is a 48-core optical cable; the armor layer 5 is made of galvanized steel wire ring; the thickness of the inner lining layer 4 of the PP rope is 3.0mm, and the thickness of the outer lining layer 6 of the PP rope is 6.0mm.
[0027] The conductive core 1 includes a water-blocking conductor 8, a conductor shielding layer 9, an insulation layer 10, an insulation shielding layer 11, a semi-conductive water-blocking binding tape layer 12, an alloy lead sheath 13, and a PE outer sheath 14. The PE outer sheath 14 is disposed around the alloy lead sheath 13, which is disposed around the semi-conductive water-blocking binding tape layer 12. The semi-conductive water-blocking binding tape layer 12 is formed by winding semi-conductive tape on the surface of the insulation shielding layer 11. The insulation shielding layer 11 is disposed around the insulation layer 10, which is disposed around the conductor shielding layer 9, and the conductor shielding layer 9 is disposed around the water-blocking conductor 8.
[0028] In this embodiment, the water-blocking conductor 8 is made of multiple strands of water-blocking wire twisted together. The water-blocking wire includes an aluminum alloy wire and a water-blocking tape, with the water-blocking tape wrapped around the surface of the aluminum alloy wire. A temperature sensor and a stress sensor are installed inside the water-blocking conductor. The temperature sensor monitors the conductor temperature in real time to prevent insulation aging due to excessive temperature. The stress sensor monitors the stress on the conductor and issues an early warning when the stress is abnormal. The aluminum alloy wire used in the water-blocking conductor has high conductivity and tensile strength, effectively withstanding the tension of the submarine cable during laying and operation, while reducing the weight of the submarine cable and facilitating laying.
[0029] The conductor shielding layer 9 is made of semi-conductive shielding material and has a thickness of 2.0 mm. The insulating shielding layer 11 is made of semi-conductive shielding material and has a thickness of 1.8 mm.
[0030] The alloy lead sleeve 13 is made of lead alloy material and is made into a corrugated sleeve by extrusion process. The sleeve is tightly fitted outside the semi-conductive resistive water binding tape layer, and a leakage current sensor is installed inside the sleeve.
[0031] The insulation layer 10 is made of a novel composite insulation material with a thickness of 34 mm. This material is made of cross-linked polyethylene (XLPE) and nano-level insulating additives. The nano-level insulating additives are nano-cellulose with a mass percentage content of 4-7%. The nano-level insulating additives can effectively inhibit the accumulation of space charge, improve the insulation performance of the insulation layer under DC voltage, and enhance the mechanical strength and heat resistance of the insulation layer.
[0032] The overall testing of this invention includes electrical performance testing, mechanical performance testing, and environmental adaptability testing of the manufactured submarine cable to ensure that all indicators of the cable meet the design requirements. After passing the tests, the submarine cable is coiled and packaged, ready for laying and use.
[0033] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those embodiments or examples, without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.
Claims
1. A high-voltage, high-capacity three-core submarine cable, characterized in that: The device comprises three conductive cores, two optical fibers, a coated tape layer, a PP rope inner lining layer, an armor layer, a PP rope outer lining layer, and a protective adhesive layer. The protective adhesive layer is located around the outer PP rope lining layer, which in turn is located around the armor layer. The armor layer is located around the inner PP rope lining layer, which is located around the coated tape layer. The coated tape layer is formed by wrapping coated tape around the three conductive cores and two optical fibers to bind them together. A filler strip is provided between the three conductive cores and two optical fibers. Each conductive core includes a water-blocking conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a semi-conductive water-blocking binding tape layer, an alloy lead sheath, and a PE outer sheath. The PE outer sheath is located around the alloy lead sheath, which is located around the semi-conductive water-blocking binding tape layer. The semi-conductive water-blocking binding tape layer is formed by wrapping semi-conductive tape around the surface of the insulation shielding layer. A shielding layer is disposed around the insulation layer, which in turn is disposed around the conductor shielding layer, which is disposed around the water-blocking conductor. The surface of the protective adhesive layer is provided with an anti-corrosion and anti-bioadhesion layer. The water-blocking conductor is made of multiple strands of water-blocking wire twisted together, including aluminum alloy wire and water-blocking tape, with the water-blocking tape wrapped around the surface of the aluminum alloy wire. A temperature sensor and a stress sensor are installed inside the water-blocking conductor. The temperature sensor monitors the conductor temperature in real time to prevent insulation aging due to excessive temperature. The stress sensor monitors the stress on the conductor and issues an early warning when the stress is abnormal. The anti-corrosion and anti-bioadhesion layer includes a nano-anti-corrosion coating and an epoxy resin-based nano-silver coating. The nano-anti-corrosion coating is applied to the surface of the protective adhesive layer, and after the anti-corrosion coating dries, the epoxy resin-based nano-silver coating is applied. The mass percentage of silver in the epoxy resin-based nano-silver coating is 0.20%–0.40%.
2. The ultra-high voltage, high-capacity three-core submarine cable according to claim 1, characterized in that: The alloy lead sleeve is made of lead alloy material and is made into a corrugated sleeve through an extrusion process. The sleeve is tightly fitted onto the outside of the semiconducting resistive water binding tape layer, and a leakage current sensor is installed inside the sleeve.
3. The ultra-high voltage, high-capacity three-core submarine cable according to claim 1, characterized in that: The insulation layer uses a novel composite insulation material with a thickness of 34 mm. This material is made by mixing cross-linked polyethylene (XLPE) with nano-level insulation additives, wherein the nano-level insulation additives are nanocellulose with a mass percentage content of 4-7%.
4. The ultra-high voltage, high-capacity three-core submarine cable according to claim 1, characterized in that: The conductor shielding layer is made of a semi-conductive shielding material with a thickness of 2.0 mm.
5. The ultra-high voltage, high-capacity three-core submarine cable according to claim 1, characterized in that: The insulating shielding layer is made of a semi-conductive shielding material and has a thickness of 1.8 mm.
6. The ultra-high voltage, high-capacity three-core submarine cable according to claim 1, characterized in that: The armor layer uses galvanized steel wire rings.
7. The ultra-high voltage, high-capacity three-core submarine cable according to claim 1, characterized in that: The thickness of the inner lining layer of the PP rope is 3.0 mm; the thickness of the outer lining layer of the PP rope is 6.0 mm.
8. The ultra-high voltage, high-capacity three-core submarine cable according to claim 1, characterized in that: The optical cable is a 48-core optical cable.