High-voltage single-core dynamic submarine cable

Abstract

The utility model provides a high-voltage single-core dynamic submarine cable. The optical cable sequentially comprises a water-blocking copper conductor, a semi-conductive water-blocking binding tape, a conductor shield, an XLPE insulator, an insulation shield, a water-blocking buffer layer, a metal shielding layer, a first non-metal sheath, an optical fiber unit, an optical unit filler, an enhanced wrapping tape, a second non-metal sheath, a first metal wire armor layer, an enhanced wrapping tape and a second metal wire armor layer from inside to outside. And an enhanced wrapping tape and a third non-metal sheath. According to the utility model, the corrugated copper sleeve is used as the metal shielding layer, and the three-layer non-metal sheath is used as the protection layer, so that the outer diameter can be effectively reduced, and a dynamic submarine cable with a higher voltage grade and a larger conductor cross section can be produced, thereby realizing high-voltage and large-capacity power transmission of floating type wind power generation projects in deep and far sea in the future.

Description

Technical Field

[0001] The utility model belongs to the field of single-core high-voltage dynamic submarine cables, and particularly relates to a high-voltage single-core dynamic submarine cable. Background Technique

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] With the rapid development of offshore wind power, the construction of nearshore wind farms has gradually tended to saturation, and the single-unit capacity of floating wind turbines in the deep sea has also been continuously increasing. There is an urgent need for high-voltage, large-capacity, large-cross-section dynamic submarine cables that can adapt to large water depths, which are applied to the power transmission of deep-sea floating offshore booster stations or floating offshore converter stations.

[0004] At present, the voltage levels of dynamic submarine cables used in floating offshore wind power projects are mainly 35 kV and 66 kV. Their structural forms are copper-core three-core AC cross-linked polyethylene insulation, water-blocking tape wrapping, copper wire and copper tape shielding, phase-separated PE sheath, and overall wrapping inner and outer sheaths and inner and outer steel wires (copper wires) armoring after cabling. The use of double-layer metal wire armoring inside and outside can increase the tensile strength and elastic modulus of the submarine cable. However, due to the large outer diameter of the three-core submarine cable, the number of required armoring metal wires in the outer layer also increases accordingly, resulting in a relatively large single weight of the submarine cable, which is not conducive to construction and installation. Therefore, there are very few applications of high-voltage submarine cables with a water depth of more than 1000 m at home and abroad. In addition, the three-core AC dynamic submarine cable also performs less satisfactorily in terms of transmission capacity and line loss.

[0005] The invention patent application of "A High-Voltage Dynamic Submarine Cable" disclosed in CN111883310A introduces a dynamic submarine cable with an annealed corrugated copper sleeve as the metal shielding layer, adding multiple water-blocking buffer layers and an even number of flat steel wires as the armoring layer. The advantages of this submarine cable are that the metal shielding layer can play the functions of carrying short-circuit current and radial water-blocking, multiple water-blocking tapes can effectively achieve water-blocking, and the flat steel wires can reduce the cabling outer diameter of the dynamic submarine cable to a certain extent. However, the structure of this submarine cable is still a three-core AC dynamic submarine cable, and its basic cabling outer diameter has no particularly obvious difference from before, and the weight per unit length of the submarine cable has basically not changed, which does not improve the transportation and laying of the dynamic submarine cable to a large extent. In addition, this design of the submarine cable cannot improve its transmission capacity.

[0006] The utility model patent "A Dynamic Submarine Cable" disclosed in CN217902754U introduces a dynamic submarine cable. It uses flat steel wires with rounded corners on the side to form an armor layer, and there is a certain gap between the steel wires that make up the same armor layer. An anti-wear layer is provided between adjacent armor layers. The advantages of this dynamic submarine cable are that the flat steel wires can increase the contact area between the steel wires and the inner sheath, reduce the problem of stress concentration in the inner sheath layer, and to a certain extent reduce the volume of the cable. The gap between the steel wires and the anti-wear layer can reduce the friction between adjacent steel wires and further improve the service life of the steel wires and the submarine cable. However, the outer diameter of this improved dynamic submarine cable is not much different from the previous one, and the overall electrical performance of the submarine cable has not been significantly improved. Summary of the Invention

[0007] To solve the above problems, the utility model proposes a high-voltage single-core dynamic submarine cable. The utility model uses a corrugated copper sleeve as the metal shielding layer and three non-metallic sheaths as the protective layer, which can effectively reduce the outer diameter size, and can produce dynamic submarine cables with higher voltage levels and larger conductor cross-sections, so as to realize high-voltage and large-capacity power transmission in future deep-sea floating wind power projects, and can be applied to the high-voltage AC dynamic submarine cable transmission of deep-sea floating offshore booster stations or the high-voltage DC dynamic submarine cable transmission projects of deep-sea floating offshore converter stations.

[0008] According to some embodiments, the utility model adopts the following technical solutions:

[0009] A high-voltage single-core dynamic submarine cable, comprising a water-blocking conductor, a semi-conductive water-blocking binding tape, a conductor shielding layer, an XLPE insulation layer, an insulation shielding layer, a water-blocking buffer layer, a metal shielding layer, a first non-metallic sheath, an optical fiber unit, an optical unit filling, a reinforced tape, a second non-metallic sheath, a first metal wire armor layer, a reinforced tape, a second metal wire armor layer, a reinforced tape and a third non-metallic sheath, which are arranged in sequence from the inside out;

[0010] The stranding directions of the first metal wire armor layer and the second metal wire armor layer are opposite.

[0011] As an alternative embodiment, the water-blocking conductor is made of multiple round TR-type annealed copper wires and is formed by tightly pressing and stranding the copper wires in layers.

[0012] As an alternative embodiment, when the cross-section of the water-blocking conductor exceeds a set threshold, the shape of the copper single wire is trapezoidal, the conductor structure type is a shaped wire conductor, and a seawater-proof water-blocking filling material is filled and coated between each layer of single wires.

[0013] As a further improvement, the seawater-proof water-blocking filling material is a seawater-proof water-blocking tape material with a high water absorption expansion rate and a high degree, and 1 to 2 layers of semi-conductive water-blocking binding tapes are wound around the water-blocking conductor.

[0014] As an alternative embodiment, the metal shielding layer is a welded corrugated copper sleeve, and the thickness range of the corrugated copper tube is 0.5 - 2.0 mm.

[0015] As an alternative embodiment, the first non-metallic sheath, the second non-metallic sheath, and the third non-metallic sheath are all sheath materials based on polyethylene.

[0016] The sheath has high hardness and wear resistance, and the waterproof and mechanical properties of the submarine cable are enhanced through the multi-layer non-metallic sheath structure.

[0017] As an alternative embodiment, the conductor shielding layer, the XLPE insulation layer, and the insulation shielding layer are extruded on the surface of the water-blocking conductor by a three-layer co-extrusion method, wherein the XLPE insulation uses an insulating material adapted to its voltage level and power transmission form.

[0018] As an alternative embodiment, the water-blocking buffer layer is wound with 1 - 2 layers of semi-conductive water-blocking tapes in an overlapping manner, and the overlapping rate is 10% - 30%.

[0019] As an alternative embodiment, the first metal wire armor layer and the second metal wire armor layer are composed of circular or flat metal wires wound around, the metal wire material is copper wire or steel wire, the diameter of the round metal wire is 4 - 8 mm, the thickness of the flat metal wire is 2.5 - 4.0 mm, and the width is 5 - 12 mm; there is an enhanced tape between adjacent metal wire armor layers.

[0020] As an alternative embodiment, the metal shielding layer is a copper braided mesh, and a layer of seawater-resistant semi-conductive water-blocking tape material is wound around the braided copper mesh.

[0021] As an alternative embodiment, the first metal wire armor layer and the second metal wire armor layer are formed by winding multiple metal wires, and the number of layers is an even number, at least two layers, and the twisting directions of adjacent armor layers are opposite.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] The present utility model uses a single-core submarine cable to solve the problem of power transmission in a floating offshore wind power project. Compared with a conventional three-core AC dynamic submarine cable, the outer diameter and weight of the dynamic submarine cable are significantly reduced; by using a corrugated copper sleeve as the metal shielding layer, it functions to carry short-circuit current and block water radially; radial water blocking can be achieved through the water-blocking buffer layer; the extruded semi-conductive sheath can fill the wrinkled concave gaps of the corrugated copper sleeve to achieve longitudinal water blocking and improve strength; through the design of an even number of layers of thick round metal wire armor layers, the bending strength and tensile strength of the extra-high voltage dynamic submarine cable can be greatly improved, facilitating transportation and construction.

[0024] The utility model provides excellent radial water-blocking effect, ensuring the normal use of ultra-clean high-voltage insulating materials in the deep sea, high salinity and high water pressure environment; at the same time, the utility model also provides a high-voltage, large cross-section and large-capacity dynamic single-core submarine cable for floating offshore wind power, filling the gap of single-core high-voltage dynamic submarine cable, and its performance also fully meets the use requirements of dynamic submarine cable.

[0025] Under the condition of the same transmission capacity, compared with the current three-core dynamic submarine cable, the outer diameter of the AC single-core dynamic submarine cable can be reduced by 40% - 60%, and the self-weight of the submarine cable can be reduced by 50% - 70%; the outer diameter of the single-core DC dynamic submarine cable can be reduced by 40% - 60%, and the self-weight of the submarine cable can be reduced by 50% - 70%. It solves the problems of large cable weight and large stress during vertical laying and installation under the condition of large water depth, and realizes lighter cable weight and smaller cable outer diameter while ensuring the electrical performance of the submarine cable; at the same time, due to the reduction of its outer diameter, theoretically, a dynamic submarine cable with a higher voltage level and a larger conductor cross-section can be produced, so as to realize high-voltage and large-capacity power transmission in future deep-sea floating wind power projects, and can be applied to the high-voltage AC dynamic submarine cable transmission of deep-sea floating offshore booster stations or the high-voltage DC dynamic submarine cable transmission project of deep-sea floating offshore converter stations, and is suitable for the application environment of large water depth of 3000m and below.

[0026] In order to make the above-mentioned objects, features and advantages of the utility model more obvious and understandable, the following specific preferred embodiments are given, and detailed descriptions are made in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0027] The specification drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0028] Figure 1 It is a schematic diagram of a single-core dynamic submarine cable of an embodiment.

[0029] Among them, 1. Water-blocking conductor, 2. Semi-conductive water-blocking binding tape, 3. Conductor shield, 4. XLPE insulation, 5. Insulation shield, 6. Water-blocking buffer layer, 7. Metal shield layer, 8. First semi-non-metallic sheath, 9. Optical fiber unit, 10. Optical unit filling, 11. Reinforced tape, 12. Second non-metallic sheath, 13. First metal wire armor layer, 14. Reinforced tape, 15. Second metal wire armor layer, 16. Reinforced tape, 17. Third non-metallic sheath. Detailed Embodiments

[0030] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0031] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0033] In the case of no conflict, the embodiments in this application and the features in the embodiments can be combined with each other.

[0034] Embodiment 1

[0035] A high-voltage AC (DC) single-core dynamic submarine cable, which sequentially includes a water-blocking conductor 1, a semiconductive water-blocking binding tape 2, a conductor shield 3, an XLPE insulation 4, an insulation shield 5, a water-blocking buffer layer 6, a metal shield layer 7, a first non-metallic sheath 8, an optical fiber unit 9, an optical unit filling 10, a reinforced tape 11, a second non-metallic sheath 12, a first wire armor layer 13, a reinforced tape 14, a second wire armor layer 15, a reinforced tape 16, and a third non-metallic sheath 17 from the inside to the outside.

[0036] In this embodiment, the metal shield layer 7 is a welded corrugated copper sleeve, and the thickness range of the corrugated copper tube is 0.5 - 2.0 mm, having good waterproof performance.

[0037] In this embodiment, the first non-metallic sheath 8, the second non-metallic sheath 12, and the third non-metallic sheath 17 are all sheath materials based on polyethylene. The sheath has high hardness and wear resistance, and the waterproof and mechanical properties of the submarine cable are enhanced through a multi-layer non-metallic sheath structure.

[0038] In this embodiment, the water-blocking conductor 1 uses multiple round TR-type annealed copper wires. The copper wires are tightly pressed and stranded in layers; if the cross-sectional area of the conductor exceeds 1800 mm 2 , then the shape of the copper single wire is trapezoidal, and the conductor structure type is a shaped wire conductor. A seawater-proof water-blocking filling material, such as a water-blocking compound or a water-blocking tape, is filled and coated between each layer of single wires. Among them, the water-blocking tape material is a water-blocking tape material with a high water absorption expansion rate and high seawater-proof performance. 1 - 2 layers of semiconductive water-blocking binding tapes are wound around the conductor.

[0039] In this embodiment, the conductor shield 3, XLPE insulation 4, and insulation shield 5 are extruded on the conductor surface by a three-layer co-extrusion method, where the XLPE insulation uses an insulating material adapted to its voltage level and power transmission form (AC or DC).

[0040] In this embodiment, the water-blocking buffer layer 6 is wound with 1 to 2 layers of semiconductive water-blocking tapes in an overlapping manner, and the overlapping rate is 10% - 30%.

[0041] In this embodiment, the enhanced tapes 11 and 14 are high-strength tape materials with excellent properties such as breaking strength and elongation at break, such as polyester braided combined tapes and rubber-coated cotton tapes.

[0042] In this embodiment, the first wire armor layer 13 and the second wire armor layer 15 are composed of circular or flat wires wound around, and the wire materials are copper wires and steel wires. The diameter of the circular wire is 4 - 8 mm, the thickness of the flat wire is 2.5 - 4.0 mm, and the width is 5 - 12 mm. There is an enhanced tape between adjacent wire armor layers.

[0043] In this embodiment, the twisting directions of the first wire armor layer 13 and the second wire armor layer 15 are opposite.

[0044] In some preferred embodiments, the metal shielding layer 7 can also be a copper braided mesh, and a seawater-proof semiconductive water-blocking tape material needs to be wound around the braided copper mesh. At the same time, the XLPE insulating material should use a water-tree-resistant insulating material.

[0045] In some preferred embodiments, the first non-metallic sheath 8, the second non-metallic sheath 12, and the third non-metallic sheath 17 can also use polyurethane materials.

[0046] In some preferred embodiments, the first wire armor layer 13 and the second wire armor layer 15 are formed by winding multiple wires, and the number of layers of the armor layer is an even number and at least two layers. The twisting directions of adjacent armor layers are opposite to ensure torque balance.

[0047] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made by those skilled in the art without creative efforts within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-voltage single-core dynamic submarine cable, characterized in that It includes a water-blocking conductor, a semiconductive water-blocking binding tape, a conductor shielding layer, an XLPE insulation layer, an insulation shielding layer, a water-blocking buffer layer, a metal shielding layer, a first non-metallic sheath, an optical fiber unit, an optical unit filling, a reinforced tape, a second non-metallic sheath, a first wire armor layer, a reinforced tape, a second wire armor layer, a reinforced tape, and a third non-metallic sheath, which are arranged in sequence from the inside out; The stranding directions of the first wire armor layer and the second wire armor layer are opposite.

2. The high-voltage single-core dynamic submarine cable according to claim 1, wherein The water-blocking conductor is made of multiple round TR-type annealed copper wires and is formed by tightly pressing and stranding the copper wires in layers.

3. The high-voltage single-core dynamic submarine cable according to claim 1, characterized in that, When the cross-section of the water-blocking conductor exceeds a set threshold, the shape of the copper single wire is trapezoidal, the conductor structure type is a shaped wire conductor, and a seawater-proof water-blocking filling material is filled and coated between each layer of single wires; The seawater-proof water-blocking filling material is a seawater-proof water-blocking tape material with a high water absorption expansion rate and a high degree. One to two layers of semiconductive water-blocking binding tapes are wound around the water-blocking conductor.

4. The high-voltage single-core dynamic submarine cable according to claim 1, wherein The metal shielding layer is a welded corrugated copper sleeve, and the thickness range of the corrugated copper tube is 0.5 - 2.0 mm.

5. The high-voltage single-core dynamic submarine cable according to claim 1, characterized in that, The first non-metallic sheath, the second non-metallic sheath, and the third non-metallic sheath are all sheath materials based on polyethylene.

6. The high-voltage single-core dynamic submarine cable according to claim 1, characterized in that, The conductor shielding layer, the XLPE insulation layer, and the insulation shielding layer are extruded on the surface of the water-blocking conductor by a three-layer co-extrusion method, and the XLPE insulation uses an insulation material adapted to its voltage level and power transmission form.

7. The high-voltage single-core dynamic submarine cable according to claim 1, wherein The water-blocking buffer layer is wound with one to two layers of semiconductive water-blocking tapes in an overlapping manner, and the overlapping rate is 10% - 30%.

8. The high-voltage single-core dynamic submarine cable according to claim 1, characterized in that, The first wire armor layer and the second wire armor layer are composed of circular or flat metal wires wound around, the metal wire material is copper wire or steel wire, the diameter of the round metal wire is 4 - 8 mm, the thickness of the flat metal wire is 2.5 - 4.0 mm, and the width is 5 - 12 mm; there is a reinforced tape between adjacent wire armor layers.

9. The high-voltage single-core dynamic submarine cable according to claim 1, wherein The metal shielding layer is a copper braid, and a layer of seawater-proof semiconductive water-blocking tape material is wound around the copper braid.

10. A high-voltage single-core dynamic submarine cable as claimed in claim 1, characterized in that, The first wire armor layer and the second wire armor layer are formed by winding multiple metal wires, and the number of layers is even, at least two layers, and the stranding directions of adjacent armor layers are opposite.

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