Environment-friendly ethylene propylene rubber insulated optical fiber composite high-voltage wet-type submarine cable

Abstract

The utility model provides an environment-friendly ethylene propylene rubber insulation optical fiber composite high-voltage wet-type submarine cable, which comprises a power wire core and an optical cable, and is characterized in that the power wire core sequentially comprises a conductor, a waterproof tree conductor shielding layer, a waterproof tree ethylene propylene rubber insulation layer, a waterproof tree insulation shielding layer and a tinned copper strip shielding layer from inside to outside; a water-blocking tape is wrapped outside the power wire cores and the optical cable, filling ropes are filled among the water-blocking tape, the power wire cores and the optical cable, a water-blocking rope is wrapped outside the water-blocking tape, and an armor layer is arranged outside the water-blocking rope. The submarine cable simultaneously realizes power and communication transmission, the outer diameter and weight of the cable are obviously reduced, and the submarine cable is more environment-friendly compared with a common submarine cable.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly relates to an environment-friendly ethylene propylene rubber insulated optical fiber composite high-voltage wet subsea cable. Background Art

[0002] With the strengthening of China's offshore wind power and oil and gas exploitation efforts and the continuous progress of offshore wind power and oil and gas exploitation technologies, offshore wind power and oil and gas exploitation have achieved rapid development. Conventional submarine cables usually adopt a dry structure. By increasing the lead sheath water-blocking layer, the insulation core of the submarine cable can be kept dry for a long time to ensure the normal operation of the submarine cable in seawater and reach the normal service life. However, as the offshore distance of offshore wind power and offshore oil and gas development is getting farther and the water depth is getting deeper, conventional submarine cables are prone to fatigue damage when floating in deep water, have a short service life, are inconvenient to lay, and have a large input cost. Therefore, conventional submarine cables can no longer meet the normal operation requirements of deep water areas. Currently, in submarine cable transmission lines, the HYJQ41 type structure of cross-linked polyethylene insulation + lead sheath + high-density polyethylene sheath + steel wire armor + PP rope + asphalt is often used. However, the outer diameter and weight of the submarine cable with this structure are relatively large, the cable is relatively bulky, the production and installation costs are not ideal, and at the same time, the lead and asphalt in the cable cause obvious pollution to the marine environment. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an environment-friendly ethylene propylene rubber insulated optical fiber composite high-voltage wet subsea cable, which can realize power and communication transmission at the same time, significantly reduce the outer diameter and weight of the cable, and is more environmentally friendly than ordinary submarine cables.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: an environment-friendly ethylene propylene rubber insulated optical fiber composite high-voltage wet subsea cable, which includes a power core and an optical cable. The power core includes a conductor, a water-tree resistant conductor shielding layer, a water-tree resistant ethylene propylene rubber insulating layer, a water-tree resistant insulation shielding layer, and a tinned copper tape shielding layer from the inside to the outside. A water-blocking tape is wrapped around the outside of the power core and the optical cable. The space between the water-blocking tape, the power core, and the optical cable is filled with a filling rope. A water-blocking rope is wrapped around the outside of the water-blocking tape, and an armor layer is arranged outside the water-blocking rope.

[0005] In a preferred solution, the stranding gap of the conductor is filled with a rubber material.

[0006] In a preferred solution, the filling rope is a polypropylene rope.

[0007] In a preferred solution, the armor layer is a steel wire armor, and the steel wire of the armor layer is a galvanized steel wire.

[0008] In a preferred solution, an independent polyethylene sheath is arranged outside the steel wire of the armor layer.

[0009] In a preferred embodiment, the waterproof tree conductor shielding layer 2 and the waterproof tree insulation shielding layer 4 are made of a polyethylene semi-conductive shielding material containing 30% ethylene-ethyl acrylate.

[0010] An environmentally friendly ethylene-propylene rubber insulated optical fiber composite high-voltage wet submarine cable provided by the present utility model has the following beneficial effects:

[0011] 1. The wet submarine cable structure of ethylene-propylene rubber insulation + tinned copper tape is adopted to replace the existing HYJQ41 type structure of cross-linked polyethylene insulation + lead sheath + high-density polyethylene sheath. The ethylene-propylene rubber insulation replaces the cross-linked polyethylene insulation, the tinned copper tape replaces the lead sheath, and at the same time the high-density polyethylene outer sheath is removed, saving production steps, production raw materials, and reducing production costs.

[0012] 2. The conductor is a water-blocking conductor. While the conductor is stranded, a rubber material is extruded into the gaps between the conductors to block seawater from entering the conductor when the submarine cable is damaged by external machinery, minimizing the loss.

[0013] 3. The ethylene-propylene rubber insulation adopts a new imported material with excellent performance. Especially the water-tree performance and the accelerated water absorption performance ensure that the insulation performance does not decrease after contact with seawater.

[0014] 4. The cable structure is innovatively designed. The tinned copper tape replaces the lead sheath, and at the same time the outermost structure of PP rope + asphalt coating is removed, saving the production and installation costs of the cable, avoiding the damage of lead and asphalt to the marine environment, and being more environmentally friendly than ordinary submarine cables.

[0015] 5. An independent polyethylene sheath is provided outside the steel wire of the armor layer, increasing the wear resistance and corrosion resistance of the submarine cable during laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0017] Figure 1 is a cross-sectional view of the cable of the present utility model;

[0018] Figure 2 is a preparation process diagram of the cable of the present utility model;

[0019] In the figure: conductor 1, waterproof tree conductor shielding layer 2, waterproof tree ethylene-propylene rubber insulation layer 3, waterproof tree insulation shielding layer 4, tinned copper tape shielding layer 5, filling rope 6, water-blocking tape 7, water-blocking rope 8, armor layer 9, polyethylene sheath 10, optical cable 11. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Such as Figure 1As shown in the figure, an environmentally friendly ethylene-propylene rubber insulated optical fiber composite high-voltage wet subsea cable includes three power cores and an optical cable 11. The optical cable 11 is a steel wire armored and strengthened 24-core single-mode optical fiber, which consists of an optical fiber, a stainless steel tube, a polyethylene inner sheath, a steel wire armored layer, and a polyethylene outer sheath from the inside to the outside. The power core includes a conductor 1, a water-tree resistant conductor shielding layer 2, a water-tree resistant ethylene-propylene rubber insulating layer 3, a water-tree resistant insulating shielding layer 4, and a tinned copper tape shielding layer 5 from the inside to the outside. The water-tree resistant conductor shielding layer 2 and the water-tree resistant insulating shielding layer 4 are made of polyethylene semi-conductive shielding material, specifically polyethylene semi-conductive shielding material containing 30% ethylene-ethyl acrylate, which has higher thermal stability and better mechanical properties compared with the traditional ethylene-vinyl acetate semi-conductive shielding material. The water-tree resistant ethylene-propylene rubber insulating layer 3 uses a new imported material with excellent performance, especially the water-tree resistant performance and the accelerated water absorption performance, which ensure that the insulation performance does not decrease after contact with seawater.

[0021] A water-blocking tape 7 is wound around the outside of the three power cores and the optical cable 11. The space between the water-blocking tape 7, the power cores, and the optical cable 11 is filled with a filling rope 6. In this embodiment, the filling rope 6 is a polypropylene rope. A water-blocking rope 8 is wound around the outside of the water-blocking tape 7, and an armored layer 9 is arranged outside the water-blocking rope 8. The water-blocking tape 7 and the water-blocking rope 8 fix the cable stranding process and ensure the roundness of the cable after stranding; at the same time, the water-blocking tape 7 and the water-blocking rope 8 also have a certain water-blocking effect, delaying the contact between the cable insulation and seawater.

[0022] The cable structure adopts a wet subsea cable structure with ethylene-propylene rubber insulation + tinned copper tape, which significantly reduces the cable outer diameter and weight. At the same time, this cable combines power and communication transmission into one, saving the subsea cable laying channel resources, thus saving production and installation costs. At the same time, because the tinned copper tape is used instead of the lead sheath, and the outermost PP rope + asphalt coating structure is removed, it avoids the damage of lead and asphalt to the marine environment and is more environmentally friendly than ordinary subsea cables.

[0023] Preferably, the conductor 1 is a water-blocking conductor with a rubber material filled in the stranding gap. The water-blocking conductor is formed by squeezing the rubber material into the conductor gap during conductor stranding. When the subsea cable is damaged by external machinery, it blocks seawater from entering the conductor 1 and minimizes the loss.

[0024] Preferably, the armored layer 9 is a steel wire armor, and the steel wire of the armored layer 9 is a galvanized steel wire. An independent polyethylene sheath 10 is arranged outside the steel wire of the armored layer 9, that is, a polyethylene sheath 10 is arranged outside each armored steel wire, which increases the wear resistance and corrosion resistance of the subsea cable during laying. The PP rope + asphalt coating structure outside the armored layer 9 is removed, saving the production and installation costs of the cable and avoiding the damage of lead and asphalt to the marine environment, making it more environmentally friendly than ordinary subsea cables.

[0025] The processing technology of the submarine cable provided by the utility model is as follows Figure 2 shown. It can be seen that ethylene-propylene rubber insulation replaces the cross-linked polyethylene insulation of ordinary submarine cables, and tinned copper tape replaces the lead sheath. At the same time, the high-density polyethylene outer sheath is removed, saving production steps, production raw materials, and reducing production costs.

Claims

1. An environmentally friendly EPDM insulated optical fiber composite high voltage wet submarine cable, characterized in that: The invention comprises a power line core and an optical cable (11), wherein the power line core comprises a conductor (1), a waterproof tree conductor shielding layer (2), a waterproof tree EPDM rubber insulation layer (3), a waterproof tree insulation shielding layer (4) and a tinned copper tape shielding layer (5) in sequence from the inside to the outside, and a water-blocking tape (7) is wrapped around the outside of the power line core and the optical cable (11), and a filling rope (6) is used to fill the water-blocking tape (7) and the power line core and the optical cable (11), and a water-blocking rope (8) is wrapped around the outside of the water-blocking tape (7), and an armor layer (9) is arranged on the outside of the water-blocking rope (8), and a rubber material is filled in the twisted gap of the conductor (1), and the armor layer (9) is a steel wire armor, and the steel wire of the armor layer (9) is a galvanized steel wire, and an independent polyethylene sheath (10) is arranged on the outside of the steel wire of the armor layer (9).

2. The environmentally friendly EPDM insulated optical fiber composite high voltage wet submarine cable according to claim 1, characterized in that: The filling rope (6) is a polypropylene rope.

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