Anti-skin-effect large-section submarine cable conductor structure and cable thereof

Abstract

The utility model discloses an anti-skin-effect large-section submarine cable conductor structure and a cable thereof. The anti-skin-effect large-section submarine cable conductor structure comprises a circular conductor layer and a molded line layer from inside to outside, the circular conductor layer is composed of a plurality of layers of conductor monofilaments which are twisted together and are subjected to oxidation treatment, and a longitudinal wrapping water-blocking tape is arranged outside each layer of conductor monofilaments after each layer of conductor monofilaments are twisted; the number of the molded line layers is at least two, water-blocking materials are filled among the molded line single lines in the same layer of the molded line layers, and wire enamel is sprayed among the layers. An oxidation film is arranged on the surface of each round copper conductor single line, so that the interference among the single lines is small, the eddy current effect is low, the anti-skin effect is good, and the current-carrying capacity of the conductor is strong; the outer layer adopts molded lines for water-blocking filling and paint spraying treatment, displacement deviation among the conductors is small, the insulation effect is good, the outer diameter of the conductor can be effectively reduced, and the surface electric field of the conductor is more uniform. When the cable is applied to the cable, compared with a common cable, the cable has a better water-blocking effect and larger effective current-carrying capacity.

Description

Technical Field

[0001] The utility model relates to a skin effect resistant large-section submarine cable conductor structure and a cable thereof, belonging to the field of cables. Background Art

[0002] With the advancement of offshore wind power technology, coastal countries around the world are gradually deepening the development of marine and offshore resources. The overall offshore wind power field is developing in the direction of high AC voltage, and the cross-sectional area of ​​its conductors is increasing in response to this. Cable conductors will produce skin effect when AC current flows through them, and it becomes more serious as the conductor cross-section increases; the skin effect causes the effective electrical cross-section of the conductor to be smaller than the physical cross-section, which not only reduces the current carrying capacity of the cable, but also produces greater line losses, making the actual current carrying capacity of the conductor far lower than the theoretical value. Based on the above technical background, it is an important issue to reasonably optimize the conductor structure and production process, reduce the conductor skin effect, and reduce the AC resistance and current loss of the conductor.

[0003] At present, the production of large-section conductors mainly involves dividing the large-section conductors into several strands, which are insulated and isolated with insulating crepe paper and then twisted. This solution is equivalent to connecting multiple mutually insulated fan-shaped strands in parallel; due to the small cross-sectional area of ​​a single fan-shaped strand, the skin effect of a single strand is greatly reduced, thereby reducing the AC resistance of the conductor. However, when this technology is applied to submarine cables, the differences in strands are often magnified due to water-blocking filling, resulting in an uneven cable surface and making it unsuitable for use. Submarine cables using this technical solution are often prone to problems such as slippage and misalignment, which greatly reduces the life of the cable and increases the risk of accidents, which is not conducive to the normal operation of the cable. Based on the above background, designing a conductor structure with high current carrying capacity, strong water-blocking performance, and a very smooth surface has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The utility model aims to provide a large-section submarine cable conductor structure with anti-skin effect.

[0005] The technical solution for achieving the purpose of the utility model is: a skin effect resistant large-section submarine cable conductor structure, comprising a circular conductor layer and a profiled wire layer from inside to outside; the circular conductor layer is composed of a plurality of layers of oxidized conductor monofilaments twisted together, and each layer of conductor monofilaments is provided with a longitudinal water-blocking tape on the outside after being twisted; the profiled wire layer is provided with at least two layers, and water-blocking material is filled between each profiled wire of the same layer of the profiled wire layer, and wire enamel is sprayed between each layer.

[0006] The utility model anti-skin effect large-section submarine cable conductor structure performs oxidation treatment on the circular copper conductor, and an oxide film is formed on the surface of the copper single wire, which can effectively reduce the interference between the copper single wires, effectively reduce the eddy current effect in the conductor, generate anti-skin effect inside the wire, and improve the current carrying capacity of the conductor. The longitudinally wrapped water-blocking tape arranged between the layers can achieve a water-blocking effect between the layers;

[0007] The outer layer of the large-section submarine cable conductor structure of the utility model adopts a profiled wire structure, and the profiled wire layers are separated by enameled wire paint, which can ensure the insulation effect while fixing the conductor, effectively improve the smoothness of the conductor surface, reduce the outer diameter of the conductor, effectively reduce the embedding of the conductor shield, and make the electric field distribution on the conductor surface more uniform.

[0008] The utility model discloses a skin-effect-resistant large-section submarine cable conductor structure, which is used to reduce the conductor AC resistance and eliminate the skin effect during the manufacture of submarine cables, thereby improving the power transmission efficiency, reducing the heating of the conductor during the operation of the cable, and effectively ensuring the long-term stable operation of the cable.

[0009] Further or optionally, the water-blocking material filled in the mold line layer is a rubber-based semiconductive water-blocking compound, which can maintain the processability of the water-blocking material under the premise of a high filling factor and reduce the processing difficulty.

[0010] Further or optionally, the wire enamel of the wire layer is one of polyurethane paint, polyesterimide paint and polyester paint, so as to avoid uneven electric field distribution of the conductor, reduce the AC resistance of the conductor, weaken the influence of the skin effect, reduce the heat generation during the operation of the isolated submarine cable, and ensure the long-term operation of the submarine cable.

[0011] Further or optionally, the longitudinally wrapped water-blocking tape of the circular conductor layer is an insulating or semi-conductive water-blocking tape made of a non-woven fabric material containing water-absorbing and swelling particles, combined with a water-blocking yarn. When the cable is flooded, the water-absorbing particles can ensure the dryness of the inside of the cable and prevent the cable from failing.

[0012] Further or optionally, the cross-sectional area of ​​the circular conductor layer is not less than 500m 2 , to ensure the current carrying capacity.

[0013] Further or optionally, the oxide film thickness of the circular conductor layer is not less than 1 mm to obtain a sufficient insulation effect.

[0014] Further or optionally, the profile of the profile layer is a T-shaped cross-section or a Z-shaped cross-section, so that the gap between the profiles is lower, the conductor cross-section filling rate is higher, the outer layer is less likely to become loose after twisting, and the water-blocking effect is better.

[0015] The utility model also provides a cable, which is made of the above-mentioned anti-skin effect large-section submarine cable conductor structure. When the cable is used in submarine wind power projects, the skin effect is smaller and the reliability is higher.

[0016] By adopting the above technical solution, the utility model has the following beneficial effects:

[0017] (1) The surface of the single wire of the circular copper conductor of the utility model is oxidized to form an oxide film, which has less interference between the single wires, low eddy current effect, good resistance to skin effect, and strong conductor current carrying capacity; the outer layer is filled with water-blocking wire and spray-painted, the displacement deviation between the conductors is small, the insulation effect is good, the outer diameter of the conductor can be effectively reduced, and the electric field on the surface of the conductor is more uniform.

[0018] (2) The water-blocking material filled in the molded line layer of the utility model is a rubber-based semiconductive water-blocking compound, which can maintain the easy processability of the water-blocking material under the premise of a high filling factor and reduce the processing difficulty.

[0019] (3) The wire enamel of the wire layer of the utility model is one of polyurethane paint, polyester imide paint and polyester paint, so as to avoid uneven distribution of the electric field of the conductor, reduce the AC resistance of the conductor, weaken the influence of the skin effect, reduce the heat generation during the operation of the isolated submarine cable, and ensure the long-term operation of the submarine cable.

[0020] (4) The longitudinally wrapped water-blocking tape of the circular conductor layer of the utility model is an insulating or semi-conductive water-blocking tape made of a non-woven fabric material containing water-absorbing and swelling particles, combined with a water-blocking yarn. When the cable is soaked in water or other problems, the water-absorbing particles can ensure the dryness of the inside of the cable and prevent the cable from failing.

[0021] (5) The utility model limits the conductor cross-sectional area and the size of the conductor oxide film to ensure the insulation effect and current carrying capacity.

[0022] (6) The wires of the wire layer of the utility model are T-shaped or Z-shaped, so that the gaps between the wires are lower, the conductor cross-section filling rate is higher, the outer layer is less likely to become loose after twisting, and the water-blocking effect is better.

[0023] (7) The present invention also provides a cable which has a smaller skin effect and higher reliability when used in submarine wind power projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 It is a structural schematic diagram of the utility model.

[0026] The reference numerals in the accompanying drawings are:

[0027] A circular conductor layer 1, a conductor single wire 11, a longitudinally wrapped water-blocking tape 12, a profiled wire layer 2, a profiled wire single wire 21, and a wire enamel 22. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] (Example 1)

[0035] See Figure 1 The present embodiment provides a skin-effect resistant large-section submarine cable conductor structure, which is divided into a two-layer structure, including a circular conductor layer 1 and a profiled wire layer 2 from inside to outside; the circular conductor layer 1 is composed of a plurality of oxidized conductor monofilaments 11 twisted together, and each layer of conductor monofilaments 11 is provided with a longitudinal water-blocking tape 12 on the outside after being twisted; the profiled wire layer 2 is provided with at least two layers, and water-blocking material is filled between each profiled wire 21 of the same layer of the profiled wire layer, and wire enamel 22 is sprayed between each layer.

[0036] During the production process, the inner layer is twisted with compressed round copper conductors. The single wires of the round copper conductors are oxidized before twisting. The thickness of the oxide film of the round conductor layer 1 is not less than 1 mm, so that there is sufficient spacing and insulation between the single wires of the round copper conductors. After each layer is twisted, a layer of water-blocking tape is longitudinally wrapped on the surface of the round copper conductor. The water-blocking filling material is composed of an insulating or semi-conductive water-blocking tape made of non-woven fabric containing water-absorbing and expanding particles combined with a water-blocking yarn.

[0037] In order to ensure the current carrying effect, the cross-sectional area of ​​the inner circular conductor layer 1 shall not be less than 500m 2 .

[0038] After the inner circular conductor layer 1 is twisted, the outer layer is twisted with the profile wire layer 2. During the twisting process, water-blocking material is filled between the conductors of the same layer of profile wire. In order to overcome the problem of insufficient filling of ordinary water-repellent materials, the water-blocking material filled in the profile wire layer is a rubber-based semiconductor water-repellent compound. After each layer of profile wire is twisted, enameled wire paint is applied on its outer layer to enhance the water-blocking effect. In terms of material selection, one of polyurethane paint, polyester imide paint, and polyester paint can be selected.

[0039] In order to ensure the filling factor of the conductor during the twisting process, the wire of the wire layer 2 adopts a T-shaped cross-section or a Z-shaped cross-section. In this way, the probability of sliding between the single wires of the wire is smaller after the twisting is completed, and the probability of the outer wire layer 2 being loose is relatively low. When used in submarine cables, the probability of water ingress is smaller.

[0040] The utility model also provides a cable, which is made of the above-mentioned anti-skin effect large-section submarine cable conductor structure. During production, a metal shielding layer, an insulating layer, an insulating shielding layer, a buffer layer, a metal sheath layer, an inner lining layer, an armor layer, and an outer layer are sequentially arranged on the outer layer of the conductor provided by the utility model. The submarine cable has a large effective cross-section, low AC resistance and power loss, and a uniform conductor electric field. When laid on the seabed, the radius is small, the transportation cost is low, and the water-blocking effect is better than that of ordinary cables.

[0041] 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. A large-section submarine cable conductor structure with anti-skin effect, characterized in that: A skin-effect resistant large-section submarine cable conductor structure, characterized in that it comprises a circular conductor layer (1) and a profiled wire layer (2) from inside to outside; the circular conductor layer (1) is composed of a plurality of oxidized conductor monofilaments (11) twisted together, and each layer of conductor monofilaments (11) is provided with a longitudinal water-blocking tape (12) on the outside after being twisted; the profiled wire layer (2) is provided with at least two layers, water-blocking material is filled between each profiled wire (21) of the same layer of the profiled wire layer, and wire enamel (22) is sprayed between each layer.

2. The anti-skin effect large-section submarine cable conductor structure according to claim 1, characterized in that: The water-blocking material filled in the mold line layer is a rubber-type semiconductive water-blocking compound.

3. The anti-skin effect large-section submarine cable conductor structure according to claim 1, characterized in that: The wire enamel of the molded wire layer (2) is one of polyurethane varnish, polyester imide varnish and polyester varnish.

4. The anti-skin effect large-section submarine cable conductor structure according to claim 1, characterized in that: The longitudinally wrapped water-blocking tape (12) of the circular conductor layer (1) is a combination of an insulating or semi-conductive water-blocking tape made of a non-woven fabric material containing water-absorbing and swelling particles and a water-blocking yarn.

5. The anti-skin effect large-section submarine cable conductor structure according to claim 1, characterized in that: The cross-sectional area of ​​the circular conductor layer (1) is not less than 500 m 2 .

6. The anti-skin effect large-section submarine cable conductor structure according to claim 1, characterized in that: The oxide film thickness of the circular conductor layer (1) is not less than 1 mm.

7. The anti-skin effect large-section submarine cable conductor structure according to claim 1, characterized in that: The profile of the profile layer (2) is a T-shaped cross section or a Z-shaped cross section.

8. A cable, characterized in that: The invention is made of a large-section submarine cable conductor structure with anti-skin effect as described in any one of claims 1 to 7.

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