Optical fiber composite submarine cable

Abstract

The utility model discloses an optical fiber composite submarine cable, comprising conductor units, an optical unit, a support filling and an outer layer protection structure, the conductor units are arranged in the outer layer protection structure in an annular array, the support filling is arranged between adjacent conductor units, and low thermal resistance pp soft filling is filled between the support filling and the conductor units; the support filler is of an axisymmetric W-shaped structure and comprises two sunken side wings and a hollow part located at the lower part, the conductor unit is arranged in the two sunken side wings, and the optical unit is arranged in the hollow part; each conductor unit is provided with a copper wire metal shielding layer; the armor layer of the outer protection structure is formed by winding copper wires or non-magnetic steel wires. According to the utility model, a plurality of low electromagnetic loss materials and low thermal resistance coefficient materials are combined, the current-carrying capacity can be improved by about 20% compared with the traditional capacity-increasing cable structure, the requirement of high current-carrying capacity is met without increasing the radius of the submarine cable, and the cost advantage is obvious compared with the conventional scheme of increasing the cross section of the conductor, adopting pure copper and the like.

Description

Technical Field

[0001] The utility model relates to an optical fiber composite submarine cable, belonging to the technical field of cables. Background Art

[0002] Submarine cables are an important part of wind power projects, accounting for about 10%. With the revision of policies, wind power subsidies have been gradually cancelled, which has led to increased cost pressure on projects. In order to save money, the industry has begun to pay attention to the cost of submarine cables.

[0003] As the capacity of offshore wind farms increases, the current carrying capacity of submarine cables is gradually developing towards longer and more complex lines. In order to solve this problem, the industry has adopted a variety of solutions. One solution is to use a high-voltage submarine cable system, which leads to a significant increase in transmission costs; another method is to use aluminum-core submarine cables instead of copper-core submarine cables, but this solution, on the one hand, has an excessively large cable radius due to the insufficient current carrying capacity of aluminum wires, resulting in increased laying costs; on the other hand, the high resistivity of aluminum causes high heat generation in the cable, posing certain safety hazards to the operation of wind power networks. How to increase the current carrying capacity of cables without increasing production costs has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to provide an optical fiber composite submarine cable to solve the above technical problems.

[0005] The technical solution to achieve the purpose of the utility model is: an optical fiber composite submarine cable, comprising a conductor unit, an optical unit, a support filling and an outer protective structure, wherein the conductor unit annular array is arranged inside the outer protective structure, the support filling is arranged between adjacent conductor units, and low thermal resistance pp soft filling is filled between the support filling and the conductor unit; the support filling is an axisymmetric W-shaped structure, comprising two concave side wings and a hollow located at the bottom, the conductor unit is arranged in the two concave wings, and the optical unit is arranged in the hollow; the conductor unit has a copper wire metal shielding layer; the outer protective structure comprises a wrapping tape, an inner lining layer, an armor layer and an outer layer, and the armor layer is wound with copper wire or non-magnetic steel wire.

[0006] The utility model adopts low thermal resistance pp soft filling in the cable, sets a copper wire metal shielding layer in the conductor unit, and replaces the galvanized steel wire commonly used in the armor layer with copper wire or non-magnetic steel wire, wherein the low thermal resistance pp soft filling can reduce the loss by reducing the thermal resistance coefficient of the material, and the copper wire metal shielding layer of the conductor unit can replace the traditional lead sheath on the one hand, reduce the radius of the submarine cable, and the low electromagnetic loss performance of the copper wire or non-magnetic steel wire is conducive to increasing the current carrying capacity; after testing, the adoption of this scheme can increase the current carrying capacity by about 20% compared with the traditional capacity-increasing cable structure. The scheme described in the utility model can meet the requirements of high current carrying capacity without increasing the radius of the submarine cable, and has obvious cost advantages compared with conventional schemes such as increasing the conductor cross-section and using pure copper.

[0007] Further or optionally, the conductor unit includes a metal water-blocking conductor, a semiconductor water-blocking binding tape, a conductor shielding layer, an insulating layer, an insulating shielding layer, a first semiconductor water-blocking tape, a metal shielding layer, a second semiconductor water-blocking tape, a semiconductive composite tape and a semiconductive PE sheath arranged from the inside to the outside, and the insulating layer is made of anti-water tree insulating material with a heat resistance temperature of >105°C.

[0008] The insulation layer of the utility model adopts water tree resistant insulation material and strictly controls the heat resistance temperature. The insulation purity is higher, and compared with ordinary materials, it has better heat resistance and electrical properties. It has stronger tolerance when the cable generates more heat, and the cable operation safety is better.

[0009] Further or optionally, the metal water-blocking conductor is made of pure copper wire, and its conductor cross-sectional area is greater than 400mm 2 The conductor single wire is round or shaped, and the single wires are filled with water-blocking yarn or water-blocking tape. The use of pure copper wire can make the cable have lower resistance and higher current carrying capacity. Limiting the conductor cross-sectional area can effectively ensure the current carrying capacity of the cable, while ensuring the current carrying capacity without increasing the cable cost.

[0010] Further or optionally, the conductor shielding layer, insulating layer and insulating shielding layer of the conductor unit are produced by a co-extrusion process, and the outer layer is coated with a first semi-conductive water-blocking tape, which can effectively reduce the gap between layers, enhance the water-blocking effect of the surface of the conductor unit, and reduce the cable radius.

[0011] Further or optionally, the semi-conductive composite tape of the conductor unit is an aluminum-plastic composite tape or a copper-plastic composite tape, and its outer layer is covered with a semi-conductive PE sheath. The semi-conductive PE sheath is prepared by an extrusion process. This structure ensures the electromagnetic shielding effect of the conductor unit while using the extrusion process to reduce the thickness of the semi-conductive PE layer, thereby reducing the radius of the submarine cable product.

[0012] Further or optionally, a fixed slot located on the axis of the axially symmetrical structure is also provided in the lower hollow of the support filler, the slot is fixed on the support filler, and its opening faces the side of the outer protective structure, and the optical unit is fixed in the slot. This improvement can further fix the optical unit. When the optical unit needs to be twisted in the cable preparation process, the probability of its displacement is lower, and the overall communication performance of the composite submarine cable is more stable.

[0013] By adopting the above technical solution, the utility model has the following beneficial effects:

[0014] (1) The utility model adopts low thermal resistance PP soft filling in the cable, sets a copper wire metal shielding layer in the conductor unit, and replaces the galvanized steel wire commonly used in the armor layer with copper wire or non-magnetic steel wire. The low thermal resistance PP soft filling can reduce the loss by reducing the thermal resistance coefficient of the material. The copper wire metal shielding layer of the conductor unit can replace the traditional lead sheath and reduce the radius of the submarine cable. The low electromagnetic loss performance of copper wire or non-magnetic steel wire is conducive to increasing the current carrying capacity. According to the test, the current carrying capacity of this scheme can be increased by about 20% compared with the traditional capacity-increasing cable structure. The scheme described in the utility model can meet the requirements of high current carrying capacity without increasing the radius of the submarine cable, and has obvious cost advantages compared with conventional schemes such as increasing the conductor cross-section and using pure copper.

[0015] (2) The insulation layer of the utility model adopts water-tree resistant insulation material, and the heat-resistant temperature is strictly controlled. Its insulation purity is higher, and it has better heat resistance and electrical properties than ordinary materials. It has stronger tolerance when the cable generates high heat, and the cable operation safety is better.

[0016] (3) The utility model adopts pure copper wire as the cable core material and strictly limits the size of the cable core, which can make the cable have smaller resistance and larger current carrying capacity, ensuring the current carrying capacity without increasing the cable cost.

[0017] (4) The conductor shielding layer, the insulating layer, and the insulating shielding layer of the utility model are produced by a co-extrusion process, which effectively reduces the gap between the layers, improves the water-blocking effect of the surface of the conductor unit, and reduces the cable radius.

[0018] (5) The semi-conductive composite tape of the utility model adopts an aluminum-plastic composite tape or a copper-plastic composite tape, and its outer layer is covered with a semi-conductive PE sheath. The semi-conductive PE sheath is prepared by an extrusion process. This structure ensures the electromagnetic shielding effect of the conductor unit while using the extrusion process to reduce the thickness of the semi-conductive PE layer, thereby reducing the radius of the submarine cable product.

[0019] (6) A card slot is also provided in the lower hollow portion of the support filler of the utility model, which can further fix the optical unit. When the optical unit needs to be twisted during the cable preparation process, the probability of its displacement is lower, and the overall communication performance of the composite submarine cable is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of the utility model.

[0022] The reference numerals in the drawings are: conductor unit 1, metal water-blocking conductor 11, semiconductive water-blocking binding tape 12, conductor shielding layer 13, insulating layer 14, insulating shielding layer 15, first semiconductive water-blocking tape 16, metal shielding layer 17, second semiconductive water-blocking tape 18, semiconductive composite tape 19, semiconductive PE sheath 20;

[0023] Light unit 2;

[0024] Support filling 3, side wings 31, hollow 32;

[0025] Outer protective structure 4, wrapping tape 41, inner lining layer 42, armor layer 43, outer layer 44, low thermal resistance PP soft filling 5. DETAILED DESCRIPTION

[0026] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the embodiments of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0031] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the scope of protection of the utility model.

[0032] (Example 1)

[0033] See Figure 1 , an optical fiber composite submarine cable of the present embodiment is characterized in that it comprises a conductor unit 1, an optical unit 2, a supporting filler 3 and an outer protective structure 4, wherein the conductor unit 1 is arranged in an annular array inside the outer protective structure 4, the supporting filler 3 is arranged between adjacent conductor units 1, and a low thermal resistance pp soft filler 5 is filled between the supporting filler 3 and the conductor unit 1; the supporting filler 3 is an axisymmetric W-shaped structure, comprising two concave side wings 31 and a hollow 32, the conductor unit 1 is arranged in the side wings 31, and the optical unit 2 is arranged in the hollow 32; the conductor unit 1 has a copper wire metal shielding layer; the outer protective structure 4 comprises a wrapping tape 41, an inner lining layer 42, an armor layer 43 and an outer layer 44, and the armor layer 43 is wound with copper wire or non-magnetic steel wire.

[0034] In the above structure, it should be noted that the material of the low thermal resistance PP soft filler 5 needs to be improved and its formula needs to be optimized to reduce its thermal resistance, so as to reduce the heat loss of the cable and avoid the reduction of conductivity or damage due to overheating.

[0035] The conductor unit 1 includes a metal water-blocking conductor 11, a semiconducting water-blocking binding tape 12, a conductor shielding layer 13, an insulating layer 14, an insulating shielding layer 15, a first semiconducting water-blocking tape 16, a metal shielding layer 17, a second semiconducting water-blocking tape 18, a semiconducting composite tape 19 and a semiconducting PE sheath 20 arranged from the inside to the outside. The insulating layer 14 is made of water-tree resistant insulating material with a heat-resistant temperature greater than 105°C. The conductor shielding layer 13, the insulating layer 14 and the insulating shielding layer 15 of the conductor unit 1 are produced by a co-extrusion process, and the outer layer is coated with the first semiconducting water-blocking tape 16.

[0036] During the preparation process, attention should be paid to the preparation process and material formula. The conductor shielding layer 13, the insulating layer 14 and the insulating shielding layer 15 need to be extruded simultaneously to ensure that the three layers are not delaminated due to uneven cooling speed. The insulating layer 14 needs to reduce the cross-linking agent content and increase the antioxidant content in the original formula to improve its insulation purity, heat resistance and electrical properties, so as to ensure that the cable performance is not degraded or risks occur during use due to insufficient heat resistance.

[0037] The metal water-blocking conductor 11 is made of pure copper wires, and its conductor cross-sectional area is greater than 400mm2. The single conductor wires are round or shaped wires, and water-blocking yarns or water-blocking tapes are filled between the single wires. If shaped wires are used in the process of twisting the cable core, the water-blocking yarn or water-blocking tape can be replaced with water-blocking glue to overcome the problem of mismatch between the shape of the water-blocking yarn and the gap between the single wires of the cable core.

[0038] The semi-conductive composite tape 19 of the conductor unit 1 is made of aluminum-plastic composite tape or copper-plastic composite tape, and its outer layer is coated with a semi-conductive PE sheath 20. The semi-conductive PE sheath 20 is prepared by an extrusion process. During the preparation process, the extrusion process of the semi-conductive PE sheath 20 is directly carried out after the semi-conductive composite tape coating process is completed. Here, as with the previous extrusion process, the thickness of the PE sheath is reduced, thereby reducing the radius of the composite cable to reduce the transportation pressure during the laying process.

[0039] A fixed slot located on the axis of the axially symmetrical structure is also provided in the hollow 32 of the support filler 3. The slot is fixed on the support filler with its opening facing the side of the outer protective structure. The optical unit 2 is fixed in the slot. The slot can be designed according to the diameter of the optical unit 2 to ensure that the optical unit 2 is stably fixed in the slot to prevent displacement due to twisting, water flow impact and other factors during the subsequent preparation process or operation of the composite submarine cable, thereby enhancing the overall stability of the performance of the optoelectronic composite submarine cable.

[0040] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical fiber composite submarine cable, characterized in that: The invention comprises a conductor unit (1), an optical unit (2), a supporting filler (3) and an outer protective structure (4), wherein the conductor unit (1) is arranged in an annular array inside the outer protective structure (4), the supporting filler (3) is arranged between adjacent conductor units (1), and a low thermal resistance PP soft filler (5) is filled between the supporting filler (3) and the conductor unit (1); the supporting filler (3) is an axisymmetric W-shaped structure, comprising two concave side wings (31) and a hollow (32) located at the bottom, the conductor unit (1) is arranged in the side wings (31), and the optical unit (2) is arranged in the hollow (32); the conductor unit (1) is provided with a copper wire metal shielding layer; the outer protective structure (4) comprises a wrapping tape (41), an inner lining layer (42), an armor layer (43) and an outer coating layer (44), and the armor layer (43) is wound with copper wire or non-magnetic steel wire.

2. The optical fiber composite submarine cable according to claim 1, characterized in that: The conductor unit (1) comprises a metal water-blocking conductor (11), a semiconducting water-blocking binding tape (12), a conductor shielding layer (13), an insulating layer (14), an insulating shielding layer (15), a first semiconducting water-blocking tape (16), a metal shielding layer (17), a second semiconducting water-blocking tape (18), a semiconducting composite tape (19) and a semiconducting PE sheath (20) arranged from inside to outside, wherein the insulating layer (14) is made of an anti-water-tree insulating material with a heat-resistant temperature greater than 105°C.

3. The optical fiber composite submarine cable according to claim 2, characterized in that: The metal water-blocking conductor (11) is made of pure copper wire and has a conductor cross-sectional area of ​​>400 mm 2 The conductor single wire is round or shaped, and water-blocking yarn or water-blocking tape is filled between the single wires.

4. The optical fiber composite submarine cable according to claim 2, characterized in that: The conductor shielding layer (13), the insulating layer (14) and the insulating shielding layer (15) of the conductor unit (1) are produced by a co-extrusion process, and the outer layer is coated with a first semi-conductive water-resistant tape (16).

5. The optical fiber composite submarine cable according to claim 2, characterized in that: The semi-conductive composite tape (19) of the conductor unit (1) is made of an aluminum-plastic composite tape or a copper-plastic composite tape, and its outer layer is coated with a semi-conductive PE sheath (20). The semi-conductive PE sheath (20) is prepared by an extrusion process.

6. The optical fiber composite submarine cable according to claim 1, characterized in that: A fixed slot located on the axis of the axially symmetrical structure is also provided in the hollow (32) of the support filler (3); the slot is fixed on the support filler with its opening facing the outer protective structure; and the light unit (2) is fixed in the slot.

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