Novel DC submarine cable

Abstract

The utility model discloses a novel direct current submarine cable, comprising an aluminum conductor cable core, a shielding layer wrapped outside the aluminum conductor cable core, an insulating layer wrapped outside the shielding layer, a sheath wrapped outside the insulating layer, optical fibers distributed outside the sheath, an armor layer sleeved outside the optical fibers, and an insulating layer wrapped outside the armor layer. And the outer side of the armor layer is coated with an outer sheath. The cable is lighter in weight per unit length, lower in cost, less in intermediate joints in the construction process, low in construction difficulty, convenient to transport, lay and install and short in construction period, has good electrical performance, heat resistance and mechanical performance in the use process, greatly reduces the cost of direct-current power transmission, and is suitable for popularization and application. The technical problem of sending out the energy of the ultra-long-distance ultra-large wind power plant is solved.

Description

Technical Field

[0001] The utility model relates to a novel direct current submarine cable, belonging to the technical field of power transmission equipment. Background Art

[0002] As offshore wind power increases in distance and wind farm size, the voltage and frequency stability issues of AC grid connection have become the main factors restricting its development. For deep and deep offshore wind farms, high-voltage direct current transmission has low losses and can operate asynchronously with the grid, making it more suitable for long-distance, large-scale power transmission and grid connection.

[0003] In the existing technology, the cost of DC transmission is high. For example, the offshore wind farm is currently 100km to 150km away from the shore, with a scale of 1000MW to 3000MW. The price of 150km copper conductor DC submarine cable is very high and the weight is very large. The length of the submarine cable is limited by the conditions of the submarine cable manufacturer. At the same time, there is a shortage of super-large transport and laying ship machinery resources, and the manufacturing and construction are very difficult. In order to achieve parity in offshore wind power development, technological innovation of wind farm equipment is becoming increasingly urgent.

[0004] The single-core DC submarine cable currently in circulation in the market is a copper conductor structure submarine cable. This type of submarine cable has good electrical performance, heat resistance, and mechanical properties. However, this copper core submarine cable has the disadvantages of heavy weight per unit length, high cost, many intermediate joints during laying, great construction difficulty, inconvenient transportation, laying, and installation, and requires a super-large tonnage construction ship, which is short of laying ship resources and has a long construction period. Therefore, we propose a new type of DC submarine cable. Utility Model Content

[0005] The purpose of the utility model is to provide a new type of DC submarine cable, which has good electrical performance, heat resistance, and mechanical properties, and also has the advantages of light weight per unit length, low cost, few intermediate joints, low construction difficulty, convenient transportation, laying and installation, and short construction period.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions: a new type of DC submarine cable, comprising an aluminum conductor cable core, the outer side of the aluminum conductor cable core is coated with a shielding layer, the outer side of the shielding layer is coated with an insulating layer, the outer side of the insulating layer is coated with a sheath, optical fibers are distributed on the outer side of the sheath, the outer side of the optical fibers is covered with an armor layer, and the outer side of the armor layer is coated with an outer sheath.

[0007] In the aforementioned novel DC submarine cable, the aluminum conductor cable core is made of aluminum metal or composite aluminum conductor.

[0008] The aforementioned novel DC submarine cable is a circular cable composed of three conductors with 120° fan-shaped cross-sections, the aluminum conductor cable core.

[0009] In the aforementioned novel DC submarine cable, the rated voltage of the aluminum conductor cable core is one of ±160kV, ±200kV, ±250kV, ±320kV, ±400kV, and ±500kV.

[0010] The aforementioned novel DC submarine cable, the sheath comprises a metal sheath and a non-metallic sheath, the outer side of the insulating layer is covered with a metal sheath, the outer side of the metal sheath is covered with a non-metallic sheath, and the outer side of the non-metallic sheath is distributed with optical fibers.

[0011] In the aforementioned novel DC submarine cable, reinforcing steel wires are interspersed between the optical fibers.

[0012] In the aforementioned novel DC submarine cable, the gaps between the optical fibers are filled with fillers.

[0013] In the aforementioned novel DC submarine cable, the thickness of the armor layer is 2%-4% of the inner diameter of the armor layer.

[0014] In the aforementioned novel DC submarine cable, the material of the outer sheath is polyethylene or polyurethane.

[0015] In the aforementioned novel DC submarine cable, a water-blocking structure is provided between the outer sheath and the armor layer, and the water-blocking structure adopts a water-blocking tape or a water-blocking glue.

[0016] Compared with the prior art, the submarine cable of the utility model adopts an aluminum conductor cable core for high-voltage direct current transmission. The submarine cable has a lighter weight per unit length and a lower cost. In addition, the submarine cable has fewer joints and lower construction difficulty during the construction process. It is convenient to transport, lay and install, and has a short construction period. The submarine cable of the utility model has good electrical properties, heat resistance and mechanical properties during use. It greatly reduces the cost of direct current transmission and solves the technical problem of sending energy from ultra-long-distance and ultra-large wind farms. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the utility model.

[0018] Figure numerals: 1-aluminum conductor cable core, 2-shielding layer, 3-insulating layer, 4-metal sheath, 5-non-metallic sheath, 6-optical fiber, 7-armor layer, 8-outer sheath, 9-reinforced steel wire, 10-filler.

[0019] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods. DETAILED DESCRIPTION

[0020] Embodiment 1 of the utility model: A novel DC submarine cable comprises an aluminum conductor cable core 1. The submarine cable adopts the aluminum conductor cable core 1. While ensuring its performance, the weight per unit length is lighter and the cost is lower. The outer side of the aluminum conductor cable core 1 is coated with a shielding layer 2. The outer side of the shielding layer 2 is coated with an insulating layer 3. The insulating layer 3 is made of water-tree resistant cross-linked polyethylene or ethylene propylene rubber, or other insulating materials. The outer side of the insulating layer 3 is coated with a sheath. Optical fibers 6 are distributed on the outer side of the sheath for signal transmission. The shielding layer 2 prevents the aluminum conductor cable core 1 from transmitting current and affecting the optical fibers 6. The outer side of the optical fibers 6 is covered with an armor layer 7. The armor layer 7 protects the cable from being mechanically damaged by the outside and corroded by gas or seawater. The outer side of the armor layer 7 is coated with an outer sheath 8.

[0021] Embodiment 2 of the present utility model: A novel DC submarine cable comprises an aluminum conductor cable core 1, wherein the aluminum conductor cable core 1 is made of aluminum metal or composite aluminum conductor, wherein the aluminum conductor cable core 1 is a circular cable composed of three conductors with a 120° fan-shaped cross-section, wherein the edge of each fan-shaped conductor has no sharp corners and a smooth transition, and while ensuring its performance, the unit length weight is lighter and the cost is lower, wherein the aluminum conductor cable core 1 is coated with a shielding layer 2 on the outside, and the shielding layer 2 is coated with an insulating layer 3 on the outside, and the insulating layer 3 is made of water-tree resistant cross-linked polyethylene or ethylene propylene rubber, or other insulating materials, wherein the insulating layer 3 is coated with a sheath on the outside, and optical fibers 6 are distributed on the outside of the sheath for signal transmission, and the shielding layer 2 prevents the current transmitted by the aluminum conductor cable core 1 from affecting the optical fibers 6, and an armor layer 7 is mounted on the outside of the optical fibers 6, and the armor layer 7 protects the cable from being mechanically damaged by the outside and corroded by gas or seawater, and the armor layer 7 is coated with an outer sheath 8 on the outside.

[0022] Embodiment 3 of the present utility model: A novel DC submarine cable comprises an aluminum conductor cable core 1, wherein the aluminum conductor cable core 1 is made of aluminum metal or composite aluminum conductor, wherein the aluminum conductor cable core 1 is a circular cable composed of three conductors with a 120° fan-shaped cross-section, wherein the edge of each fan-shaped conductor has no sharp corners and a smooth transition, and while ensuring its performance, the unit length weight is lighter and the cost is lower, wherein the aluminum conductor cable core 1 is coated with a shielding layer 2 on the outside, and the shielding layer 2 is coated with an insulating layer 3 on the outside, wherein the insulating layer 3 is made of water-tree resistant cross-linked polyethylene or ethylene propylene rubber, or other insulating materials, wherein the insulating layer 3 is coated with a sheath on the outside, and optical fibers 6 are distributed on the outside of the sheath for signal transmission, wherein the shielding layer 2 prevents the current transmitted by the aluminum conductor cable core 1 from affecting the optical fibers 6, and an armor layer 7 is mounted on the outside of the optical fibers 6, wherein the armor layer 7 protects the cable from being mechanically damaged by the outside and corroded by gas or seawater, and the armor layer 7 is coated with an outer sheath 8 on the outside.

[0023] Specifically, the rated voltage of the aluminum conductor cable core 1 is one of ±160 kV, ±200 kV, ±250 kV, ±320 kV, ±400 kV, and ±500 kV.

[0024] Embodiment 4 of the utility model: A novel DC submarine cable, comprising an aluminum conductor cable core 1, the aluminum conductor cable core 1 is made of aluminum metal or composite aluminum conductor, the aluminum conductor cable core 1 is a round cable composed of three conductors with a 120° fan-shaped cross-section, each part of the fan-shaped conductor edge has no sharp corners and a smooth transition, while ensuring its performance, the unit length weight is lighter and the cost is lower, the aluminum conductor cable core 1 is coated with a shielding layer 2 on the outside, the shielding layer 2 is coated with an insulating layer 3 on the outside, the insulating layer 3 is made of water-tree resistant cross-linked polyethylene or ethylene propylene rubber, and can also be other insulating The insulating layer 3 is coated with a sheath on the outside, and the sheath includes a metal sheath 4 and a non-metallic sheath 5. The insulating layer 3 is coated with a metal sheath 4 on the outside, and the non-metallic sheath 5 is sleeved on the outside of the metal sheath 4. Optical fibers 6 are distributed on the outside of the non-metallic sheath 5 for signal transmission. The shielding layer 2 prevents the aluminum conductor cable core 1 from transmitting current and affecting the optical fibers 6. The optical fibers 6 are sleeved on the outside with an armor layer 7. The armor layer 7 protects the cable from being mechanically damaged by the outside and corroded by gas or seawater. The armor layer 7 is coated with an outer sheath 8 on the outside.

[0025] Specifically, the rated voltage of the aluminum conductor cable core 1 is one of ±160 kV, ±200 kV, ±250 kV, ±320 kV, ±400 kV, and ±500 kV.

[0026] Embodiment 5 of the present utility model: A novel DC submarine cable, comprising an aluminum conductor cable core 1, the aluminum conductor cable core 1 is composed of aluminum metal or composite aluminum conductor, the aluminum conductor cable core 1 is a round cable composed of three conductors with a 120° fan-shaped cross-section, the edge of each fan-shaped conductor has no sharp corners and a smooth transition, while ensuring its performance, the unit length weight is lighter and the cost is lower, the aluminum conductor cable core 1 is coated with a shielding layer 2 on the outside, the shielding layer 2 is coated with an insulating layer 3 on the outside, the insulating layer 3 is made of water-tree resistant cross-linked polyethylene or ethylene propylene rubber, or other insulating materials, the insulating layer 3 is coated with a sheath on the outside, the sheath includes a metal sheath 4 and a non-metallic sheath 5, the insulating layer 3 is coated with a metal sheath 4 on the outside, the metal A non-metallic sheath 5 is sheathed on the outside of the metal sheath 4, and optical fibers 6 are distributed on the outside of the non-metallic sheath 5 for signal transmission. The shielding layer 2 prevents the aluminum conductor cable core 1 from transmitting current and affecting the optical fibers 6. Reinforced steel wires 9 are interspersed between the optical fibers 6 to enhance the tensile strength. The gaps between the optical fibers 6 are filled with fillers 10 to protect the optical fibers 6. An armor layer 7 is sheathed on the outside of the optical fibers 6 to protect the cable from external mechanical damage, gas or seawater corrosion. An outer sheath 8 is coated on the outside of the armor layer 7. The armor layer 7 and the outer sheath 8 enhance mechanical protection such as tensile strength and compressive strength, extend the service life, and can also improve the anti-interference performance of the cable through shielding protection.

[0027] Specifically, the rated voltage of the aluminum conductor cable core 1 is one of ±160 kV, ±200 kV, ±250 kV, ±320 kV, ±400 kV, and ±500 kV.

[0028] Embodiment 6 of the present utility model: A novel DC submarine cable, comprising an aluminum conductor cable core 1, the aluminum conductor cable core 1 is made of aluminum metal or composite aluminum conductor, the aluminum conductor cable core 1 is a round cable composed of three conductors with a 120° fan-shaped cross-section, the edge of each part of the fan-shaped conductor has no sharp corners and a smooth transition, while ensuring its performance, the unit length weight is lighter and the cost is lower, the aluminum conductor cable core 1 is coated with a shielding layer 2 on the outside, the shielding layer 2 is coated with an insulating layer 3 on the outside, the insulating layer 3 is made of water-tree resistant cross-linked polyethylene or ethylene propylene rubber, and can also be other insulating materials, the insulating layer 3 is coated with a sheath on the outside, the sheath includes a metal sheath 4 and a non-metallic sheath 5, the insulating layer 3 is coated with a metal sheath 4 on the outside, and the metal sheath 4 is sheathed on the outside There is a non-metallic sheath 5, and optical fibers 6 are distributed on the outside of the non-metallic sheath 5 for signal transmission. The shielding layer 2 prevents the aluminum conductor cable core 1 from transmitting current and affecting the optical fibers 6. Reinforced steel wires 9 are interspersed between the optical fibers 6 to enhance the tensile strength. The gaps between the optical fibers 6 are filled with fillers 10 to protect the optical fibers 6. An armor layer 7 is mounted on the outside of the optical fibers 6 to protect the cable from mechanical damage by the outside and corrosion by gas or seawater. The outside of the armor layer 7 is coated with an outer sheath 8, and the material of the outer sheath 8 is polyethylene or polyurethane. The armor layer 7 and the outer sheath 8 enhance mechanical protection such as tensile strength and compressive strength, extend the service life, and can also improve the anti-interference performance of the cable through shielding protection.

[0029] Specifically, the rated voltage of the aluminum conductor cable core 1 is one of ±160 kV, ±200 kV, ±250 kV, ±320 kV, ±400 kV, and ±500 kV.

[0030] Specifically, the thickness of the armor layer 7 is 2%-4%, preferably 3%, of the inner diameter of the armor layer 7, which reduces the cost and the overall weight of the submarine cable while ensuring the protection strength of the armor layer 7.

[0031] Embodiment 7 of the present utility model: A novel DC submarine cable comprises an aluminum conductor cable core 1, wherein the aluminum conductor cable core 1 is made of aluminum metal or composite aluminum conductor, wherein the aluminum conductor cable core 1 is a round cable composed of three conductors with a 120° fan-shaped cross-section, wherein the edge of each fan-shaped conductor has no sharp corners and a smooth transition, and while ensuring its performance, the unit length weight is lighter and the cost is lower, wherein the aluminum conductor cable core 1 is coated with a shielding layer 2 on the outside, and the shielding layer 2 is coated with an insulating layer 3 on the outside, and the insulating layer 3 is made of water-tree resistant cross-linked polyethylene or ethylene propylene rubber, or other insulating materials, and the insulating layer 3 is coated with a sheath on the outside, and the sheath comprises a metal sheath 4 and a non-metallic sheath 5, and the insulating layer 3 is coated with a metal sheath 4 on the outside, and the non-metallic sheath 5 is provided on the outside of the metal sheath 4, and optical fibers 6 are distributed on the outside of the non-metallic sheath 5 for signal transmission. Signal transmission, the shielding layer 2 prevents the aluminum conductor cable core 1 from transmitting current and affecting the optical fiber 6. Reinforced steel wires 9 are interspersed between the optical fibers 6 to enhance the tensile strength. The gaps between the optical fibers 6 are filled with fillers 10 to protect the optical fibers 6. An armor layer 7 is mounted on the outside of the optical fiber 6 to protect the cable from external mechanical damage, gas or seawater corrosion. The outside of the armor layer 7 is covered with an outer sheath 8, and the material of the outer sheath 8 is polyethylene or polyurethane. The armor layer 7 and the outer sheath 8 enhance mechanical protection such as tensile strength and compressive strength to extend the service life. The anti-interference performance of the cable can also be improved through shielding protection. A water-blocking structure is provided between the outer sheath 8 and the armor layer 7. The water-blocking structure adopts a water-blocking tape or a water-blocking glue to further enhance the waterproof performance and prevent seawater erosion and damage.

[0032] Specifically, the rated voltage of the aluminum conductor cable core 1 is one of ±160 kV, ±200 kV, ±250 kV, ±320 kV, ±400 kV, and ±500 kV.

[0033] Specifically, the thickness of the armor layer 7 is 2%-4%, preferably 3%, of the inner diameter of the armor layer 7, which reduces the cost and the overall weight of the submarine cable while ensuring the protection strength of the armor layer 7.

[0034] The working principle of an embodiment of the utility model: the aluminum conductor cable core 1 of the utility model is composed of aluminum metal or composite aluminum conductor. The aluminum conductor cable core 1 is a circular cable composed of three conductors with a 120° fan-shaped cross-section. The edge of each part of the fan-shaped conductor has no sharp corners and a smooth transition. While ensuring its performance, the unit length weight is lighter and the cost is lower; the shielding layer 2 prevents the aluminum conductor cable core 1 from transmitting current and affecting the optical fiber 6, the insulating layer 3 plays the role of insulation and survival, the metal sheath 4 and the non-metallic sheath 5 further increase the protection capability, the optical fiber 6 is used for signal transmission, the armor layer 7 protects the cable from being mechanically damaged by the outside world, corroded by gas or seawater, and can also improve the cable's anti-interference performance through shielding protection, the outer sheath 8 enhances mechanical protection such as tensile strength and compressive strength, and has waterproof ability, and the water-blocking structure further enhances the waterproof performance.

Claims

1. A new type of DC submarine cable, characterized in that: The invention comprises an aluminum conductor cable core (1), wherein the aluminum conductor cable core (1) is coated with a shielding layer (2) on the outside, the shielding layer (2) is coated with an insulating layer (3) on the outside, the insulating layer (3) is coated with a sheath on the outside, optical fibers (6) are distributed on the outside of the sheath, an armor layer (7) is sheathed on the outside of the optical fibers (6), and the armor layer (7) is coated with an outer sheath (8) on the outside.

2. A novel DC submarine cable according to claim 1, characterized in that: The aluminum conductor cable core (1) is made of aluminum metal or a composite aluminum conductor.

3. A novel DC submarine cable according to claim 1, characterized in that: The aluminum conductor cable core (1) is a round cable composed of three conductors with a 120° fan-shaped cross section.

4. A novel DC submarine cable according to claim 1, characterized in that: The rated voltage of the aluminum conductor cable core (1) is one of ±160kV, ±200kV, ±250kV, ±320kV, ±400kV and ±500kV.

5. A novel DC submarine cable according to claim 1, characterized in that: The sheath comprises a metal sheath (4) and a non-metal sheath (5); the outer side of the insulating layer (3) is covered with the metal sheath (4); the outer side of the metal sheath (4) is covered with the non-metal sheath (5); and the outer side of the non-metal sheath (5) is distributed with optical fibers (6).

6. A novel DC submarine cable according to claim 1, characterized in that: Reinforcement steel wires (9) are interspersed between the optical fibers (6).

7. A novel DC submarine cable according to claim 1 or 6, characterized in that: The gaps between the optical fibers (6) are filled with fillers (10).

8. A novel DC submarine cable according to claim 1, characterized in that: The thickness of the armor layer (7) is 2%-4% of the inner diameter of the armor layer (7).

9. A novel DC submarine cable according to claim 1, characterized in that: The material of the outer sheath (8) is polyethylene or polyurethane.

10. A novel DC submarine cable according to claim 1, characterized in that: A water-blocking structure is provided between the outer sheath (8) and the armor layer (7), and the water-blocking structure adopts a water-blocking tape or a water-blocking glue.

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