Long-distance optical signal transmission submarine cable

Abstract

The utility model discloses a long-distance optical signal transmission submarine cable, which comprises a body, the body is formed by connecting a plurality of sections of cables, the cable comprises an electric unit conductor, an optical cable layer and an armor layer are arranged on the outer layer of the electric unit conductor from inside to outside, and two optical unit conductors for transmitting optical signals are arranged on the optical cable layer. The armored layer is formed by uniformly distributing composite armored steel wires wrapped with insulating sheaths along the circumferential direction, the electric unit conductors between two connected cables are connected through an electric connector, and the two optical unit conductors are respectively connected through two optical signal repeaters; and the two optical signal repeaters are electrically connected with the armored power supply through two conductive steel wire groups consisting of composite armored steel wires to supply power. The long-distance optical signal transmission submarine cable provided by the utility model can be used for connecting the optical unit conductor with the optical signal repeater in the submarine cable and ensuring the electric connection quality of the optical signal repeater.

Description

Technical Field

[0001] The utility model relates to the field of submarine cables, and specifically relates to a long-distance optical signal transmission submarine cable. Background Art

[0002] Submarine optical cables are important submarine communication (sensing) devices, and their main functions include cross-island communication networking, submarine monitoring, etc. In recent years, with the booming development of the offshore wind power industry, the application of high-voltage submarine cables has become increasingly widespread. Since the optical fibers in submarine optical cables have the special function of distributed temperature measurement, when engineers design submarine cables, they often integrate the optical cables into the submarine cables to achieve continuous distributed measurement of physical quantities such as the operating temperature and stress along the submarine cables.

[0003] The lengths of existing submarine cable projects are usually short, mostly within the range of 30 - 100 km. The attenuation value of the optical fibers is within the allowable range, so there is no need to use repeaters for signal compensation and amplification. However, in recent years, the offshore distances of offshore wind farms and the transmission distances of cross-sea power transmission projects have become longer and longer. When the length of a submarine cable project exceeds a certain range, the optical fiber attenuation is too large to continue to meet the requirements of accurate measurement. At this time, optical signal repeaters need to be arranged at certain intervals to ensure the accuracy of optical signal transmission.

[0004] Optical signal repeaters need to be electrically connected to ensure their compensation and amplification effects. In traditional submarine optical cable laying, copper tubes (wires) are often integrated in the center of the optical cable as power transmission conductors. However, in the integrated optical cable of a submarine cable (especially a single-core submarine cable), the size of the optical cable is severely restricted, and it is often impossible to integrate copper power transmission conductors in the center of the optical cable, thus limiting the length of the optical cable and further limiting the length of the submarine cable. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a long-distance optical signal transmission submarine cable that can connect optical unit conductors to optical signal repeaters in a submarine cable and ensure the electrical connection quality of the optical signal repeaters.

[0006] The technical solution adopted by the present utility model to solve the above problems is as follows: A submarine cable for long-distance optical signal transmission, including a body, the body is formed by connecting multiple sections of cables. The cable includes an electrical unit conductor, and the outer layer of the electrical unit conductor is provided with an optical cable layer and an armor layer from inside to outside. There are two optical unit conductors for transmitting optical signals on the optical cable layer, and the two optical unit conductors are symmetrically distributed about the center. The armor layer is composed of composite armor steel wires wrapped with an insulating sheath and evenly distributed along the circumference. The electrical unit conductors between two adjacent cables are connected through electrical connectors, and the two optical unit conductors are respectively connected through two optical signal repeaters. The two optical signal repeaters are respectively electrically connected to the armor power supply through two groups of conductive steel wire groups composed of composite armor steel wires for power supply.

[0007] Compared with the prior art, the advantages of the present utility model are as follows: When connecting the optical signal repeater to the optical unit conductor, the power supply wire of the optical signal repeater no longer uses the integrated copper tube (wire) on the optical unit conductor, but uses the armor layer on the submarine cable for power supply. First of all, the traditional armor layer is made of galvanized steel wire wound, and it is not used as a conductive conductor, so there is no need to insulate the steel wire. Only need to coat asphalt on the surface of the steel wire to meet the anti-corrosion requirements. However, in the present utility model, the steel wire also needs to provide a power supply function, so an insulating sheath is wrapped on the steel wire to form a composite armor steel wire. Secondly, because the resistance of steel is greater than that of copper, although the diameter of the steel wire is larger, it may not necessarily meet the power supply requirements. Therefore, according to the power supply requirements, a structure of multiple composite armor steel wires is used in parallel to form a conductive steel wire group to reduce the resistance, so as to connect the optical unit conductor in the submarine cable to the optical signal repeater and ensure the electrical connection quality of the optical signal repeater.

[0008] As an improvement of the present utility model, the optical cable layer further includes a protective metal strip and a filling strip. The diameters of the protective metal strip and the filling strip are the same as the diameter of the optical unit conductor. The protective metal strip, the filling strip, and the optical unit conductor are connected and distributed along the circumference of the body. Through the above improvement, the installation of the optical cable layer is realized, the roundness of the optical cable layer after installation is ensured, and further the quality of the submarine cable is ensured.

[0009] As an improvement of the present utility model, a protection metal strip is provided on both sides of each of the optical unit conductors. A filling strip is provided between each protection metal strip and the adjacent optical unit conductor. The protection metal strips on the same side of one optical unit conductor and another optical unit conductor are filled with multiple filling strips. Through this improvement, the design of the protection metal strips on both sides of the optical unit conductor can prevent the optical unit conductor from being squeezed and deformed, ensuring the service quality of the optical unit conductor. The design of adding a filling strip between the protection metal strip and the optical unit conductor can prevent the protection metal strip from being directly connected to the optical unit conductor. When the submarine cable is bent, it can prevent the protection metal strip from rubbing against the surface of the optical unit conductor and causing wear. The design of the other filling strips can ensure the fullness of the cable layer, effectively preventing the cable layer from deforming, and compared with using only protection metal strips, it has a lower cost and lighter weight.

[0010] As an improvement of the present utility model, a protection joint is connected between two adjacent sections of the cable. The electrical joint and the optical signal repeater are both arranged inside the protection joint. Through this improvement, the electrical joint and the optical signal repeater are protected, preventing damage caused by phenomena such as water ingress, corrosion, and impact in the submarine environment.

[0011] As an improvement of the present utility model, the protection joint includes a sealing cavity. Sealing heads are provided at both ends of the sealing cavity. The electrical joint and the optical signal repeater are arranged inside the sealing cavity. The composite armored steel wires on the two sections of the cable are respectively fixedly connected to the two sealing heads. And two electrical connection wires are led into the sealing cavity on each sealing head and are respectively electrically connected to the two optical signal repeaters. Through this improvement, the electrical connection between the composite armored steel wires and the optical signal repeaters is realized.

[0012] As an improvement of the present utility model, a fixing seat for fixing the composite armored steel wire is provided on the side of the sealing head close to the sealing cavity. A central hole for the cable after peeling off the outer protective layer to pass through is provided at the center of the fixing seat. After passing through the fixing seat, the composite armored steel wire bends outward and away from the sealing cavity along the outer surface of the fixing seat. A fixing ring for fixing the bent composite armored steel wire is provided at one end of the fixing seat close to the sealing cavity. Through this improvement, the fixed connection between the composite armored steel wire and the sealing head is realized.

[0013] As an improvement of the present utility model, the fixing seat and the fixing ring are fixedly connected by fastening bolts. The end of the composite armored steel wire in the conductive steel wire group is fixed to the fastening bolt after peeling off the insulating sheath. The electrical connection wire is also fixedly connected to the fastening bolt connected with the composite armored steel wire. Through this improvement, the electrical connection between the composite armored steel wire and the electrical connection wire is realized. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the present utility model.

[0015] Figure 2 is a schematic diagram of the cross-sectional structure of the cable of the present utility model.

[0016] Figure 3 is a schematic diagram of the internal connection structure of the protection joint of the present utility model.

[0017] Figure 4 is a schematic diagram of the connection structure of the sealing head of the present utility model.

[0018] Figure 5 is a schematic diagram of the electrical connection structure of the optical signal repeater of the present utility model.

[0019] As shown in the figure: 1. Cable, 1.1. Electrical unit conductor, 1.2. Optical cable layer, 1.2.1. Optical unit conductor, 1.2.2. Protective metal strip, 1.2.3. Filler strip, 1.3. Armor layer, 1.3.1. Composite armor steel wire, 2. Electrical joint, 3. Optical signal repeater, 4. Protection joint, 4.1. Sealing cavity, 4.2. Sealing head, 4.2.1. Fixed seat, 4.2.2. Fixed ring, 4.2.3. Tightening bolt, 4.2.4. Electrical connection wire, 5. Electrical signal transmitting terminal, 6. Electrical signal receiving terminal, 7. Optical signal transmitting terminal, 8. Optical signal receiving terminal, 9. Armor power supply, 10. Conductive steel wire group. Specific embodiments

[0020] The embodiments of the present utility model will be further described below with reference to the accompanying drawings.

[0021] As Figures 1-3 shown, a long-distance optical signal transmission submarine cable includes a body, the body is composed of multiple sections of cables 1 connected together, the cable 1 includes an electrical unit conductor 1.1, and the outer layer of the electrical unit conductor 1.1 is provided with an optical cable layer 1.2 and an armor layer 1.3 from the inside to the outside. The optical cable layer 1.2 is provided with two optical unit conductors 1.2.1 for transmitting optical signals, and the two optical unit conductors 1.2.1 are symmetrically distributed about the center. The armor layer 1.3 is composed of composite armor steel wires 1.3.1 wrapped with an insulating sheath and evenly distributed along the circumference. The electrical unit conductors 1.1 between two adjacent cables 1 are connected through an electrical joint 2, and the two optical unit conductors 1.2.1 are respectively connected through two optical signal repeaters 3. The two optical signal repeaters 3 are respectively electrically connected to the armor power supply 9 through two groups of conductive steel wire groups 10 composed of composite armor steel wires 1.3.1 for power supply. The electrical joint 2 is a conventional technical structure for cable 1 connection and repair.

[0022] As Figure 1As shown in the figure, at both ends of the body, there are respectively an electrical signal transmitting terminal 5 for providing electrical signals and an electrical signal receiving terminal 6 for receiving electrical signals. At both ends of the body, there are also respectively an optical signal transmitting terminal 7 for providing optical signals and an optical signal receiving terminal 8 for receiving optical signals. At both ends of the body, there are also respectively an armored power supply 9 for providing the electrical energy of the composite armored steel wire 1.3.1. There should be two optical unit conductors 1.2.1 connected to the optical signal transmitting terminal 7, two optical unit conductors 1.2.1 connected to the optical signal receiving terminal 8, and two conductive steel wire groups 10 connected to the armored power supplies 9 at both ends. In the figure, they are simplified to one.

[0023] As Figure 2 shown, the optical cable layer 1.2 further includes a protective metal strip 1.2.2 and a filling strip 1.2.3. The diameters of the protective metal strip 1.2.2 and the filling strip 1.2.3 are the same as the diameter of the optical unit conductor 1.2.1. The protective metal strip 1.2.2, the filling strip 1.2.3, and the optical unit conductor 1.2.1 are distributed along the circumferential direction of the body. One protective metal strip 1.2.2 is provided on both sides of each optical unit conductor 1.2.1. One filling strip 1.2.3 is provided between each protective metal strip 1.2.2 and the adjacent optical unit conductor 1.2.1. The protective metal strip 1.2.2 on one side of one optical unit conductor 1.2.1 and the protective metal strip 1.2.2 on the same side of another optical unit conductor 1.2.1 are filled with multiple filling strips 1.2.3.

[0024] As Figures 3-4As shown, a protective joint 4 is connected between two adjacent sections of the cable 1. The electrical joint 2 and the optical signal repeater 3 are both arranged inside the protective joint 4. The protective joint 4 includes a sealing cavity 4.1. Sealing heads 4.2 are provided at both ends of the sealing cavity 4.1. The electrical joint 2 and the optical signal repeater 3 are arranged inside the sealing cavity 4.1. The composite armored steel wires 1.3.1 on the two sections of the cable 1 are respectively fixedly connected to the two sealing heads 4.2. And two electrical connection wires 4.2.4 are led into the sealing cavity 4.1 on each sealing head 4.2 and are electrically connected to the two optical signal repeaters 3 respectively. On the side of the sealing head 4.2 close to the sealing cavity 4.1, there is a fixing seat 4.2.1 for fixing the composite armored steel wire 1.3.1. A central hole for the cable 1 after peeling off the outer sheath to pass through is provided at the center of the fixing seat 4.2.1. After passing through the fixing seat 4.2.1, the composite armored steel wire 1.3.1 bends outward and away from the sealing cavity 4.1 along the outer surface of the fixing seat 4.2.1. At one end of the fixing seat 4.2.1 close to the sealing cavity 4.1, there is a fixing ring 4.2.2 for fixing the bent composite armored steel wire 1.3.1. The fixing seat 4.2.1 and the fixing ring 4.2.2 are fixedly connected by a fastening bolt 4.2.3. After the end of the composite armored steel wire 1.3.1 in the conductive steel wire group 10 is peeled off the insulating sheath, it is fixedly connected to the fastening bolt 4.2.3. The electrical connection wire 4.2.4 is also fixedly connected to the fastening bolt 4.2.3 to which the composite armored steel wire 1.3.1 is connected. The connection ends of the composite armored steel wire 1.3.1, the electrical connection wire 4.2.4 and the fastening bolt 4.2.3 can all be fixed to the fastening bolt 4.2.3 through a ring terminal. The composite armored steel wire 1.3.1 and the electrical connection wire 4.2.4 are welded or clamped and fixed on the ring terminal, while the fastening bolt 4.2.3 passes through the ring terminal before being inserted into the fixing ring 4.2.2 and then is fixedly connected. The ring terminal is a conventional technical solution for wire connection.

[0025] To ensure the installation stability of the optical signal repeater 3 inside the protective joint 4, find a suitable position on the electrical joint 2 and use a cable tie to fix the optical signal repeater 3 at this position.

[0026] As Figure 5 shown, an optical signal repeater 3 is provided with a total of four wire joints. Two wire joints are used to connect the optical unit conductor 1.2.1, and two wire joints are used to connect the electrical connection wires 4.2.4. The optical signal repeater 3 is a conventional technical structure.

[0027] Through the design of the submarine cable 1 for long-distance optical signal transmission, the optical unit conductor 1.2.1 is successfully combined with the single-core cable 1, and it is ensured that during long-distance signal transmission, the optical signal is compensated and amplified without affecting the transmission quality of the optical signal.

[0028] The above description is only for the best embodiments of the present utility model, but it should not be construed as a limitation on the claims. The present utility model is not limited to the above embodiments, and its specific structure is allowed to vary. All changes made within the scope of protection of the independent claims of the present utility model are within the scope of protection of the present utility model.

Claims

1. A long-distance optical signal transmission submarine cable, characterized in that: The invention comprises a main body, wherein the main body is formed by connecting a plurality of sections of cables (1), wherein the cable (1) comprises an electrical unit conductor (1.1), wherein the outer layer of the electrical unit conductor (1.1) is provided with an optical cable layer (1.2) and an armor layer (1.3) from the inside to the outside, wherein two optical unit conductors (1.2.1) for transmitting optical signals are provided on the optical cable layer (1.2), and the two optical unit conductors (1.2.1) are symmetrically distributed about the center, and the armor layer (1.3) is composed of composite armor steel wires (1.3.1) wrapped in an insulating sheath and uniformly distributed along the circumference, wherein the electrical unit conductors (1.1) between the two connected cables (1) are connected via an electrical connector (2), and the two optical unit conductors (1.2.1) are respectively connected via two optical signal repeaters (3), and the two optical signal repeaters (3) are respectively electrically connected to an armor power source (9) via two groups of conductive steel wires (10) composed of composite armor steel wires (1.3.1) for power supply.

2. According to claim 1, a long-distance optical signal transmission submarine cable is characterized in that: The optical cable layer (1.2) further comprises a protective metal strip (1.2.2) and a filling strip (1.2.3); the diameter of the protective metal strip (1.2.2) and the diameter of the filling strip (1.2.3) are both the same as the diameter of the optical unit conductor (1.2.1); the protective metal strip (1.2.2), the filling strip (1.2.3) and the optical unit conductor (1.2.1) are connected and distributed along the circumference of the body.

3. A long-distance optical signal transmission submarine cable according to claim 2, characterized in that: A protective metal strip (1.2.2) is provided on both sides of each optical unit conductor (1.2.1), a filling strip (1.2.3) is provided between each protective metal strip (1.2.2) and the adjacent optical unit conductor (1.2.1), and a plurality of filling strips (1.2.3) are used to fill the gap between the protective metal strip (1.2.2) on one side of one optical unit conductor (1.2.1) and the protective metal strip (1.2.2) on the same side of another optical unit conductor (1.2.1).

4. The long-distance optical signal transmission submarine cable according to claim 1, characterized in that: A protective joint (4) is connected between the two connected sections of the cable (1), and the electrical joint (2) and the optical signal repeater (3) are both arranged in the protective joint (4).

5. A long-distance optical signal transmission submarine cable according to claim 4, characterized in that: The protective joint (4) comprises a sealed cavity (4.1), and sealed heads (4.2) are provided at both ends of the sealed cavity (4.1). The electrical joint (2) and the optical signal repeater (3) are arranged in the sealed cavity (4.1), and the composite armored steel wires (1.3.1) on the two sections of the cable (1) are respectively fixedly connected to the two sealed heads (4.2), and two electrical connection wires (4.2.4) are led out from each sealed head (4.2) into the sealed cavity (4.1) and are respectively electrically connected to the two optical signal repeaters (3).

6. A long-distance optical signal transmission submarine cable according to claim 5, characterized in that: A fixing seat (4.2.1) for fixing the composite armored steel wire (1.3.1) is provided on one side of the sealing head (4.2) close to the sealing cavity (4.1); a center hole is provided at the center of the fixing seat (4.2.1) for the cable (1) to pass through after the outer sheath is stripped; after passing through the fixing seat (4.2.1), the composite armored steel wire (1.3.1) is bent outwardly and in a direction away from the sealing cavity (4.1) along the outer surface of the fixing seat (4.2.1); and a fixing ring (4.2.2) for fixing the bent composite armored steel wire (1.3.1) is provided at one end of the fixing seat (4.2.1) close to the sealing cavity (4.1).

7. A long-distance optical signal transmission submarine cable according to claim 6, characterized in that: The fixing seat (4.2.1) and the fixing ring (4.2.2) are fixedly connected via a fastening bolt (4.2.3); the end of the composite armored steel wire (1.3.1) in the conductive steel wire group (10) is fixedly connected to the fastening bolt (4.2.3) after the insulating sheath is stripped off; and the electrical connection line (4.2.4) is also fixedly connected to the fastening bolt (4.2.3) connected to the composite armored steel wire (1.3.1).

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