阅读说明：本技术 一种耐疲劳高阻水海底电缆 (Fatigue-resistant high-water-resistance submarine cable ) 是由 贡新浩 刘新杰 徐彦立 梅文杰 潘文林 李春梅 沈仙美 徐强 谭会良 于 2019-12-19 设计创作，主要内容包括：本发明公开了一种耐疲劳高阻水海底电缆,包括：铜导体、屏蔽结构、聚乙烯内护层、铠装层和PP绳；所述屏蔽结构由导体屏蔽层、XLPE绝缘层和绝缘屏蔽层组成；所述屏蔽结构与所述聚乙烯内护层之间设有一层径向阻水层,所述径向阻水层由环形皱纹金属护套和阻水材料组成。通过上述方式,本发明一种耐疲劳高阻水海底电缆,该海底动态电缆的环形皱纹金属护套为铜合金材料,具有较大的皱纹深度以及较小的皱纹节距,能够显著提高海底动态电缆的耐疲劳性能以及耐水压性能,也能在一定程度上提高纵向阻水能力。(The invention discloses a fatigue-resistant high-water-resistance submarine cable, which comprises: the cable comprises a copper conductor, a shielding structure, a polyethylene inner protection layer, an armor layer and a PP rope; the shielding structure consists of a conductor shielding layer, an XLPE insulating layer and an insulating shielding layer; and a radial water-resistant layer is arranged between the shielding structure and the polyethylene inner protective layer and consists of an annular corrugated metal sheath and a water-resistant material. Through the mode, the annular corrugated metal sheath of the submarine dynamic cable is made of the copper alloy material, so that the submarine dynamic cable has large corrugated depth and small corrugated pitch, the fatigue resistance and the water pressure resistance of the submarine dynamic cable can be obviously improved, and the longitudinal water resistance can also be improved to a certain extent.)

1. A fatigue-resistant high water-blocking submarine cable, comprising: the shielding structure, the polyethylene inner protection layer, the armor layer and the PP rope are sequentially coated on the outer wall of the copper conductor from inside to outside, and the copper conductor is formed by circular pressing and twisting;

the shielding structure consists of a conductor shielding layer, an XLPE insulating layer and an insulation shielding layer, wherein the XLPE insulating layer and the insulation shielding layer are sequentially coated on the outer wall of the conductor shielding layer from inside to outside;

a radial water-blocking layer is arranged between the shielding structure and the polyethylene inner protective layer and consists of an annular corrugated metal sheath and a water-blocking material, the water-blocking material is attached to the outer wall of the annular corrugated metal sheath, the type of the water-blocking material comprises water-blocking powder and/or water-blocking yarn, and the water-blocking powder is coated on the surface of the semi-conductive belt and faces the surface with the water-blocking powder to the annular corrugated metal sheath;

the annular corrugated metal sheath is made of copper alloy, and the copper alloy comprises aluminum brass alloy, copper beryllium alloy and copper nickel alloy.

2. The fatigue-resistant high water-blocking submarine cable according to claim 1, wherein: the coating thickness of the water-blocking powder is 0.05-0.1 mm.

3. The fatigue-resistant high water-blocking submarine cable according to claim 1, wherein: the semi-conductive belt is made of nylon, polyester and non-woven fabric.

4. A fatigue-resistant high water-blocking submarine cable according to claim 3, wherein: preferably, the material of the semi-conductive belt is a nylon belt,

the fatigue-resistant high water-blocking submarine cable according to claim 1, wherein: the semi-conducting belt is wrapped on the outer wall of the annular corrugated metal sheath, and the number of the wrapping layers is one or two.

5. The fatigue-resistant high water-blocking submarine cable according to claim 1, wherein: the corrugation pitch of the annular corrugated metal sheath is 1% -10% of the outer diameter of the insulating shielding layer.

6. The fatigue-resistant high water-blocking submarine cable according to claim 6, wherein: the preferable corrugation pitch of the annular corrugated metal sheath is 3% -8% of the outer diameter of the insulation shielding layer.

7. The fatigue-resistant high water-blocking submarine cable according to claim 1, wherein: the wrinkle depth of the annular wrinkle metal sheath is 5% -20% of the outer diameter of the insulation shielding layer.

8. The fatigue-resistant high water-blocking submarine cable according to claim 8, wherein: the preferable wrinkle depth of the annular wrinkle metal sheath is 8% -15% of the outer diameter of the insulation shielding layer.

9. The fatigue-resistant high water-blocking submarine cable according to claim 1, wherein: the annular corrugated metal sheath is made of copper-nickel alloy, wherein the nickel content is 5-30 wt.%, the iron content is 1.8-2.5 wt.%, the zinc content is 0-1.0wt.%, the manganese content is 1.5-2.5wt.%, the lead content is 0-0.04 wt.%, and the balance is copper.

Technical Field

The invention belongs to the field of power cables, and particularly relates to a fatigue-resistant high-resistance submarine cable.

Background

At present, the development of clean energy is rapidly developing, particularly in the field of offshore wind power, a floating offshore wind turbine is produced in order to obtain high-quality deep sea wind resources and higher transmission capacity, a traditional submarine cable system for connecting the floating offshore wind turbine and a land cable comprises a dynamic submarine cable, a buoy, a dynamic and static conversion joint, a static submarine cable, a sea and land conversion joint and the like, and the static submarine cable is generally fixed on the seabed in a ditching, embedding or stone throwing mode.

The dynamic submarine cable between the floating offshore booster station and the static submarine cable is suspended in seawater and swings along with the movement of ocean current and wind direction, which requires that the dynamic submarine cable has higher fatigue resistance, but a radial water-blocking lead sheath used by the current submarine cable cannot meet the requirement, and a metal sheath layer with radial water-blocking capability and water pressure resistance is also needed in a deep water area with the water depth of more than 100 meters, so that the structural design of the dynamic submarine cable must meet the radial water-blocking requirement of the deep sea and also has higher fatigue resistance.

Disclosure of Invention

The invention mainly solves the technical problem of providing the fatigue-resistant high-water-resistance submarine cable which can meet the deep-sea radial water-resistance requirement and has higher fatigue resistance.

In order to solve the technical problems, the invention adopts a technical scheme that: a fatigue-resistant high water-blocking submarine cable comprising: the shielding structure, the polyethylene inner protection layer, the armor layer and the PP rope are sequentially coated on the outer wall of the copper conductor from inside to outside, and the copper conductor is formed by circular pressing and twisting;

the shielding structure consists of a conductor shielding layer, an XLPE insulating layer and an insulation shielding layer, wherein the XLPE insulating layer and the insulation shielding layer are sequentially coated on the outer wall of the conductor shielding layer from inside to outside;

a radial water-blocking layer is arranged between the shielding structure and the polyethylene inner protective layer and consists of an annular corrugated metal sheath and a water-blocking material, the water-blocking material is attached to the outer wall of the annular corrugated metal sheath, the type of the water-blocking material comprises water-blocking powder and/or water-blocking yarn, and the water-blocking powder is coated on the surface of the semi-conductive belt and faces the surface with the water-blocking powder to the annular corrugated metal sheath;

the annular corrugated metal sheath is made of copper alloy, and the copper alloy comprises aluminum brass alloy, copper beryllium alloy and copper nickel alloy.

In a preferred embodiment of the present invention, the water-blocking powder is coated to a thickness of 0.05-0.1 mm.

In a preferred embodiment of the present invention, the semiconductive tape is made of nylon, polyester, or non-woven fabric.

In a preferred embodiment of the present invention, the material of the semi-conductive belt is preferably a nylon belt,

in a preferred embodiment of the present invention, the semiconductive tape is wrapped around the outer wall of the annular corrugated metal sheath, and the number of the wrapped layers is one or two.

In a preferred embodiment of the present invention, the corrugation pitch of the annular corrugated metal sheath is between 1% and 10% of the outer diameter of the insulation shielding layer.

In a preferred embodiment of the present invention, the annular corrugated metal sheath preferably has a corrugation pitch of between 3% and 8% of the outer diameter of the insulation shield layer.

In a preferred embodiment of the present invention, the annular corrugated metal sheath has a corrugation depth of 5% to 20% of the outer diameter of the insulation shielding layer.

In a preferred embodiment of the present invention, the annular corrugated metal sheath preferably has a corrugation depth of between 8% and 15% of the outer diameter of the insulation shield layer.

In a preferred embodiment of the invention, the annular corrugated metal sheath is made of a copper-nickel alloy, wherein the nickel content is 5-30 wt.%, the iron content is 1.8-2.5 wt.%, the zinc content is 0-1.0wt.%, the manganese content is 1.5-2.5wt.%, the lead content is 0-0.04 wt.%, and the balance is copper.

The invention has the beneficial effects that: according to the fatigue-resistant high-water-resistance submarine cable, the annular corrugated metal sheath of the submarine dynamic cable is made of the copper alloy material, the depth of the corrugation is large, the corrugation pitch is small, the fatigue resistance and the water pressure resistance of the submarine dynamic cable can be remarkably improved, and the longitudinal water-resistance capability can also be improved to a certain extent.

Drawings

Fig. 1 is a schematic structural view of a fatigue-resistant high water-blocking submarine cable.

Fig. 2 is a schematic structural diagram of the fatigue-resistant high water-blocking submarine cable before water is encountered with water blocking powder.

Fig. 3 is a schematic structural view of the fatigue-resistant high water-blocking submarine cable after water-swelling of water-blocking powder.

The parts in the drawings are numbered as follows: 1. a copper conductor; 2. a conductor shield layer; 3. an XLPE insulating layer; 4. an insulating shield layer; 5. an annular corrugated metal sheath; 6. a water blocking material; 7. a polyethylene inner sheath; 8. an armor layer; 9. a PP cord; 10. a semiconducting tape.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.

Referring to fig. 1 to 3, an embodiment of the present invention includes: a fatigue-resistant high water-blocking submarine cable comprising: copper conductor 1, shielding structure, polyethylene inner sheath 7, armor 8 and PP rope 9, copper conductor 1 is formed through circular sticising transposition for the transmission current.

The shielding structure polyethylene inner sheath 7 armor 8 with PP rope 9 from inside to outside cladding in proper order on 1 outer wall of copper conductor, polyethylene inner sheath 7 has certain water-blocking ability, can protect inside water-blocking layer to avoid mechanical damage, and can tolerate short-circuit current in the annular wrinkle metal sheath 5.

The armor layer 8 and the armor layer 8 are mainly used for preventing the cable from being damaged by external machinery, are main stress parts of the submarine cable and can bear mechanical tension during laying.

The PP rope 9 is coated with asphalt on the surface, has certain wear resistance and plays a role in corrosion prevention and protection.

The shielding structure comprises conductor shielding layer 2, XLPE insulating layer 3 and insulating shielding layer 4, XLPE insulating layer 3 with insulating shielding layer 4 is from inside to outside cladding in proper order on the 2 outer walls of conductor shielding layer, conductor shielding layer 2 is used for reducing because the local electric field that 1 transposition surface irregularity of copper conductor leads to concentrates, helps evenly 1 surperficial electric field distribution of copper conductor.

The XLPE insulation layer 3 serves as cable insulation.

The insulating shielding layer 4 is used for shielding an electric field, i.e. no power line is distributed outside the insulating shielding layer 4, so that the influence of reduced insulating strength caused by an air gap between the XLPE insulating layer 3 and the annular corrugated metal sheath 5 can be avoided.

The shielding structure with be equipped with the radial water blocking layer of one deck between the polyethylene inner sheath 7, radial water blocking layer comprises annular wrinkle metal sheath 5 and water blocking material 6, water blocking material 6 attaches on the 5 outer walls of annular wrinkle metal sheath, annular wrinkle metal sheath 5 is used for radially blocking water to and bear induced-current, play good magnetic screen effect.

The annular corrugated metal sheath 5 is made of copper alloy, including aluminum brass alloy, copper beryllium alloy, copper nickel alloy and the like.

The material of the annular corrugated metal sheath 5 in this embodiment is a copper-nickel alloy, which has good corrosion resistance and tensile strength, wherein the nickel content is 5-30 wt.%, the iron content is 1.8-2.5 wt.%, the zinc content is 0-1.0wt.%, the manganese content is 1.5-2.5wt.%, the lead content is 0-0.04 wt.%, and the balance is copper.

In this example, the copper-nickel alloy ratio was 25 wt.% nickel, 2.1 wt.% iron, 0.04 wt.% zinc, 1.8wt.% manganese, 0.01 wt.% lead, and 71.05 wt.% copper.

The water-blocking material 6 forms a semi-conductive water-blocking layer for radially and longitudinally blocking water in cooperation with the annular corrugated metal sheath 5 and for equalizing the electric field distribution of the current induced in the annular corrugated metal sheath 5.

The corrugation pitch of the annular corrugated metal sheath 5 is 1% -10% of the outer diameter of the insulating shielding layer 4, the preferred corrugation pitch of the annular corrugated metal sheath 5 is 3% -8% of the outer diameter of the insulating shielding layer 4, and the corrugation pitch is the distance between adjacent corrugation peaks of the annular corrugated metal sheath 5.

The wrinkle depth of the annular wrinkle metal sheath 5 is 5% -20% of the outer diameter of the insulation shielding layer 4, the preferable wrinkle depth of the annular wrinkle metal sheath 5 is 8% -15% of the outer diameter of the insulation shielding layer 4, and the wrinkle depth is the distance from the wrinkle wave crest to the wave trough of the annular wrinkle metal sheath 5.

The fatigue and water pressure resistance of the submarine dynamic cable is achieved by increasing the corrugation depth of the annular corrugated metal sheath 5 and decreasing the corrugation pitch.

The type of the water blocking material 6 comprises water blocking powder and/or water blocking yarn, the water blocking powder is coated on the surface of the semi-conductive belt 10, one surface with the water blocking powder faces the annular corrugated metal sheath 5, the coating thickness of the water blocking powder is 0.05-0.1mm, the water blocking powder expands radially when meeting water and fills the gap between the annular corrugated metal sheath 5 and the semi-conductive belt 10, and the expanding layer and the annular corrugated metal sheath 5 act synergistically to effectively prevent the radial permeation of water.

The material of the semi-conductive belt 10 includes nylon, polyester and non-woven fabric, and the material of the semi-conductive belt 10 is preferably nylon belt.

The semi-conducting belt 10 is wrapped on the outer wall of the annular corrugated metal sheath 5, and the number of the wrapped layers is one or two.

Compared with the prior art, the submarine cable with fatigue resistance and high water resistance is characterized in that the annular corrugated metal sheath of the submarine dynamic cable is made of copper alloy material, has larger corrugated depth and smaller corrugated pitch, can obviously improve the fatigue resistance and water pressure resistance of the submarine dynamic cable, and can also improve the longitudinal water resistance to a certain extent.

The traditional water-blocking structure is generally that a metal sleeve and a water-blocking tape are distributed as radial water blocking and longitudinal water blocking, no synergistic effect exists between the metal sleeve and the water-blocking tape, and the water-blocking structure is not suitable for the use environment of a deep sea (the laying depth is more than 100 meters) dynamic submarine cable.

In the description of the present invention, it should be noted that all the components are general standard components or components known to those skilled in the art, the structure and principle of the components can be known by technical manuals or by conventional test methods, and the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate the orientations or positional relationships based on the drawings or the orientations or positional relationships usually placed when the product of the present invention is used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or the component referred to must have a specific orientation, be configured and operated in a specific orientation, and thus cannot be understood as limiting the present invention.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.