Single-core power cable and composite cable

Abstract

The invention discloses a single-core power cable and a single-core composite cable. The single-core power cable comprises a wire core, a conductor shielding layer, an insulating layer, an insulating shielding layer, a sheath layer, an armor layer and an outer coating layer from inside to outside in the radial direction, the armor layer is made of a carbon fiber composite material, and the carbon fiber composite material is prepared by taking a polymer as a matrix and carbon fibers as a reinforcing material. According to the invention, by using the carbon fiber composite material in the armor layer, not only can the problem of large metal armor loss be solved, but also the hysteresis phenomenon and the heating and temperature rise of the armor layer can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of power cables, and in particular to a single-core power cable and a composite cable. Background Art

[0002] With the development of the scale of the power industry and the diversification of power generation and transmission, the power cable transmission system has been vigorously developed to meet the needs of urban power consumption, hydropower transmission, submarine power transmission, and resource and environmental protection. The development trend of power cables is towards higher voltage, larger capacity, and longer transmission distance. On the basis of power transmission function, it also tends to have diverse functions such as signal transmission and remote communication control.

[0003] There are many ways to classify power cables, such as by voltage level, by conductor nominal cross-sectional area, by number of conductor cores, by insulation material, by functional characteristics and places of use, etc. Power cables are classified into five types according to the number of conductor cores: single-core, two-core, three-core, four-core and five-core. Generally, medium and low voltage large-section power cables and high and extra-high voltage cables are mostly single-core.

[0004] For single-core power cables, the armor layer structure is not only the main load-bearing structural element of the power cable, but also an external protective component that is responsible for preventing radial force damage to the internal wires or optical fibers and for partial corrosion resistance and electromagnetic shielding. Its performance directly affects the overall performance, product grade and service life of the power cable. The armor layer of single-core power cables usually adopts two types: steel belt armor and steel wire armor. The application of steel wire armor is more common, that is, steel wire bite armor. In order to improve the corrosion resistance of the armor layer, zinc aluminum-magnesium alloy is often plated on the surface of the steel wire. In the prior art, there are also power cables that use aluminum sheaths as armor layers.

[0005] Many issues such as the armor structure design, material selection and operation rationality of single-core steel wire armored power cables have gradually attracted people's attention, especially the problem of large metal armor loss of single-core power cables has attracted more and more attention. In response to this problem, researchers have optimized and improved the armor layer structure, and used magnetic isolation methods to reduce the magnetic density and loss of the armor layer. Literature data show that the application of magnetic isolation measures can effectively reduce the total loss in the armor and sheath, and the more magnetic isolation, the more the total loss in the steel wire armor and sheath is reduced. There are also actual cases showing that although the single-core steel wire armor magnetic material has 4 copper wires at equal intervals in the armor layer, the experiment proves that the magnetic isolation effect is limited, and the armor layer still forms a closed magnetic circuit, resulting in hysteresis. When the ferromagnet is repeatedly magnetized, the magnetic molecular oscillation intensifies, resulting in heat and temperature rise, and the steel wire will also generate induced current in the alternating magnetic field, forming eddy currents in the steel wire armor layer, both of which cause the armor to heat up.

[0006] Chinese patent CN202258529U discloses a non-magnetic alloy wire armored single-core submarine power cable, including a conductor located in the center, a conductor shielding layer wrapped outside the conductor, an insulating layer outside the conductor shielding layer, an insulating shielding layer outside the insulating layer, a water-blocking buffer layer, a metal sheath shielding layer outside the water-blocking buffer layer, a metal sheath protective layer outside the metal sheath shielding layer, an armor layer outside the metal sheath protective layer, and an outer protective layer outside the armor layer. The hysteresis loss and eddy current loss of the single-core submarine power cable armored with non-magnetic alloy steel wire in the alternating magnetic field are extremely small, thereby reducing the various electromagnetic energy loss factors of the cable in the alternating magnetic field, reducing the heat generation of the steel wire armor layer inside the cable, and thus increasing the rated current carrying capacity of the cable conductor. However, the armor layer in this scheme uses alloy steel wire as the material of the armor layer. Since metal materials are still used, the armor layer still has closed magnetic circuits and hysteresis phenomena.

[0007] Therefore, in view of the above problems in the prior art, there is an urgent need for a single-core power cable with improved material of the armor layer, which can not only solve the armor loss problem, but also effectively avoid hysteresis and heat rise of the armor layer.

[0008] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0009] The purpose of the present invention is to provide a single-core power cable and a composite cable. By using carbon fiber composite materials in the armor layer, not only can the problem of large metal armor loss be solved, but also hysteresis and heat rise of the armor layer can be effectively avoided.

[0010] To achieve the above-mentioned purpose, according to a first aspect of the present invention, the present invention provides a single-core power cable, which includes, from the inside to the outside in the radial direction: a core, a conductor shielding layer, an insulating layer, an insulating shielding layer, a sheath layer, an armor layer and an outer covering layer; the armor layer is composed of a carbon fiber composite material, which is prepared with a polymer as a matrix and carbon fiber as a reinforcing material.

[0011] Furthermore, in the above technical solution, the carbon fiber composite material can be in the form of continuous filament bundles, armored on the outside of the sheath layer by three-dimensional weaving; or, in the form of continuous thin strips, armored on the outside of the sheath layer by tape winding.

[0012] Furthermore, in the above technical solution, the thickness of the continuous thin strip may be 0.1-0.8 mm, preferably 0.3 mm; the width of the continuous thin strip may be 10 mm-100 mm, preferably 50 mm.

[0013] Furthermore, in the above technical solution, the polymer matrix may include the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer; the components are mixed by mechanical stirring to form a polymer matrix; the resin may be a polypropylene resin material.

[0014] Furthermore, in the above technical solution, an adhesive layer is provided between the sheath layer and the armor layer, and the adhesive can be provided on the outside of the sheath layer by uniform coating; the adhesive can be maleic anhydride grafted polypropylene adhesive.

[0015] According to a second aspect of the present invention, the present invention provides a single-core power cable for use on the seabed, wherein the cable comprises, from the inside to the outside in radial direction: a core, a conductor shielding layer, an insulating layer, an insulating shielding layer, a sheath layer, an armor layer and an outer covering layer; the armor layer is composed of a carbon fiber composite material, wherein the carbon fiber composite material is prepared with a polymer as a matrix and carbon fiber as a reinforcing material; a water-blocking buffer layer for blocking water and buffering pressure is provided between the insulating shielding layer and the sheath layer.

[0016] Furthermore, in the above technical solution, the carbon fiber composite material can be in the form of continuous filament bundles, armored on the outside of the sheath layer by three-dimensional weaving; or, in the form of continuous thin strips, armored on the outside of the sheath layer by tape winding.

[0017] Furthermore, in the above technical solution, the thickness of the continuous thin strip may be 0.1-0.8 mm, preferably 0.3 mm; the width of the continuous thin strip may be 10 mm-100 mm, preferably 50 mm.

[0018] Furthermore, in the above technical solution, the polymer matrix may include the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer; the components are mixed by mechanical stirring to form a polymer matrix; the resin may be an epoxy resin material.

[0019] Furthermore, in the above technical solution, an adhesive layer is provided between the sheath layer and the armor layer, and the adhesive can be an epoxy resin adhesive.

[0020] Furthermore, in the above technical solution, an inner lining layer may be provided between the sheath layer and the adhesive layer for providing mechanical and anti-corrosion protection to the sheath layer when the cable is bent; the adhesive may be provided on the outside of the inner lining layer by uniform coating.

[0021] According to a third aspect of the present invention, the present invention provides a single-core composite cable for use on the seabed, wherein the cable comprises, from the inside to the outside in radial direction: a core, a conductor shielding layer, an insulating layer, an insulating shielding layer, a sheath layer, an armor layer and an outer covering layer; the armor layer is composed of a carbon fiber composite material, wherein the carbon fiber composite material is prepared with a polymer as a matrix and carbon fiber as a reinforcing material; an optical fiber unit layer for transmitting communication signals is provided between the sheath layer and the armor layer; a water-blocking buffer layer for blocking water and buffering pressure is provided between the insulating shielding layer and the sheath layer.

[0022] Furthermore, in the above technical solution, the carbon fiber composite material can be in the form of continuous filament bundles, armored on the outside of the sheath layer by three-dimensional weaving; or, in the form of continuous thin strips, armored on the outside of the sheath layer by tape winding.

[0023] Furthermore, in the above technical solution, the thickness of the continuous thin strip may be 0.1-0.8 mm, preferably 0.3 mm; the width of the continuous thin strip may be 10 mm-100 mm, preferably 50 mm.

[0024] Furthermore, in the above technical solution, the polymer matrix may include the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer; the components are mixed by mechanical stirring to form a polymer matrix; the resin may be an epoxy resin material.

[0025] Furthermore, in the above technical solution, an adhesive layer may be provided between the sheath layer and the armor layer, and the adhesive may be an epoxy resin adhesive.

[0026] Furthermore, in the above technical solution, an inner lining layer may be provided between the sheath layer and the adhesive layer for providing mechanical and anti-corrosion protection to the sheath layer when the cable is bent; the adhesive may be provided on the outside of the inner lining layer by uniform coating.

[0027] Furthermore, in the above technical solution, the optical fiber unit layer can be arranged between the sheath layer and the lining layer, and the optical fiber unit layer is provided with at least one optical fiber and filled with one or more of glue potting agent, foam plastic, soft plastic, and polyester fiber.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1) The single-core power cable (or composite cable) of the present invention uses carbon fiber composite materials as the armor layer. In terms of mechanical properties and chemical properties, it not only meets the requirements of mechanical properties and corrosion resistance, but also meets the usual environmental requirements. Carbon fiber composite materials are non-magnetic materials. When the armor layer is completely made of non-magnetic conductive materials, the eddy current loss is minimal. Compared with the prior art, it solves the problem of metal armor loss in single-core power cables. The present invention utilizes the physical characteristics of carbon fiber composite materials with light specific gravity. Compared with the existing steel wire armored cables, it can greatly reduce the dead weight of single-core power cables, thereby solving the problems of high labor intensity, high transportation costs and expensive installation and construction costs in the production process of single-core power cables in the prior art, and improving the economy of single-core power cables during production, transportation and installation.

[0030] 2) When using carbon fiber composite materials to replace metal armor materials, the present invention not only considers its mechanical strength and anti-corrosion performance, but also considers its bending performance during transportation. The inventors have found through experimental research that when the carbon fiber composite material used in the armor layer is a strip with a width of 50mm and a thickness of 0.3mm, in addition to ensuring the mechanical strength and anti-corrosion function required by the armor layer, the bending performance of the cable is more superior;

[0031] 3) The present invention sets an adhesive layer on the inner side of the armor layer, and the adhesive layer cooperates with the armor layer and the sheath layer (or lining layer) to make the three tightly bonded, ensuring that there is no air gap inside the armor layer, thereby avoiding partial discharge failures and hazards caused by air gaps; the adhesive layer and the carbon fiber reinforced resin composite material are used as the armor layer, and the chemical compositions of the two conform to the principle of similar compatibility, so the adhesive can play a better role;

[0032] 4) The single-core power cable of the present invention can be applied to the seabed, and can also be made into a composite cable for power transmission and optical fiber transmission. When the optical fiber unit layer is set, its filling structure plays a supporting and reinforcing role around the optical fiber, which can effectively increase the strength of the optical fiber and improve its tensile strength and bending strength; the filling structure can also withstand forces in different directions such as stretching, tearing, and flattening during installation and maintenance, thereby improving the mechanical properties of the optical fiber unit layer and increasing its service life; in addition, the filling structure can also maintain the roundness of the optical cable to avoid deformation and flattening.

[0033] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a schematic cross-sectional view of a first embodiment of a single-core power cable of the present invention.

[0035] Figure 2 It is a schematic cross-sectional view of a second embodiment of a single-core power cable of the present invention (applicable to submarine power cables).

[0036] Figure 3 It is a schematic cross-sectional view of a third embodiment of a single-core power cable of the present invention (applicable to submarine composite power cables).

[0037] Description of main reference numerals:

[0038] 100-single core power cable, 200-single core submarine power cable, 300-single core submarine composite power cable;

[0039] 1-wire core, 2-conductor shielding layer, 3-insulating layer, 4-insulating shielding layer, 5-jacket layer, 6-armor layer, 7-outer coating layer, 8-adhesive layer, 9-water blocking buffer layer, 10-inner lining layer, 11-optical fiber, 12-optical fiber unit layer filler. DETAILED DESCRIPTION

[0040] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0041] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0042] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0043] In this document, the terms "first", "second", etc. are used to distinguish two different elements or parts, and are not used to limit a specific position or relative relationship. In other words, in some embodiments, the terms "first", "second", etc. can also be interchangeable.

[0044] Example 1

[0045] like Figure 1 As shown, this embodiment provides a single-core power cable, which includes from the inside to the outside in the radial direction: a core 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a sheath layer 5, an armor layer 6 and an outer coating layer 7. Except for the armor layer 6, the other seven layers are all prior art and will not be described in detail here. This embodiment improves the material used for the armor layer. Specifically, the armor layer is composed of a carbon fiber composite material, which is prepared with a polymer as a matrix and carbon fiber as a reinforcing material. The single-core cable of this embodiment uses a carbon fiber composite material as an armor layer, which can meet the technical requirements of the armor structure of a single-core power cable in terms of mechanical and chemical properties. The advantages of carbon fiber composite materials include high strength, corrosion resistance, light weight, etc. As an armor layer, it not only meets the requirements of mechanical properties and anti-corrosion properties, but also meets the usual environmental requirements. In particular, the carbon fiber composite material is a non-magnetic material. When the armor layer is completely made of non-magnetic conductive material, the eddy current loss is minimal. Therefore, this embodiment uses non-magnetic material as the armor layer structure of the cable, which solves the problem of metal armor loss of the single-core power cable relative to the prior art. This embodiment utilizes the physical characteristic of carbon fiber composite materials, which are light in specific gravity. Compared with existing steel wire armored cables, the dead weight of single-core power cables can be greatly reduced, thereby solving the problems of high labor intensity, high transportation costs and high installation and construction costs in the production process of single-core power cables in the prior art, and improving the economy of single-core power cables during production, transportation and installation.

[0046] Further, preferably but not restrictively, the carbon fiber composite material can be armored on the outside of the sheath layer 5 in the form of continuous tows by three-dimensional weaving; it can also be armored on the outside of the sheath layer 5 in the form of continuous thin strips by tape winding. Further, when the tape winding method is adopted, the thickness of the continuous thin strip can be 0.1-0.8mm, preferably 0.3mm; the width of the continuous thin strip is 10mm-100mm, preferably 50mm. The inventor found through experimental research that when the carbon fiber composite material used in the armor layer 6 is a strip with a width of 50mm and a thickness of 0.3mm, the bending performance of the cable is more superior in addition to ensuring the mechanical strength and anti-corrosion function required by the armor layer 6. That is, under the condition that the carbon fiber composite material, adhesive, and strip width conditions remain unchanged, the cable made of carbon fiber composite tapes of different thicknesses (0.1mm, 0.5mm, 0.7mm) as the armor layer 6 is compared. The cable with a carbon fiber composite tape thickness of 0.3mm has better bending performance.

[0047] Furthermore, the polymer matrix of this embodiment may include the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer. The above components are mixed by mechanical stirring to form a polymer matrix. The resin can be a polypropylene resin material. The resin of this embodiment is a polypropylene thermoplastic resin, the inorganic nanoparticles are CaCO3 whiskers, and the other components are all prior art and will not be repeated here. This embodiment uses 24K polyacrylonitrile-based carbon fiber continuous filament bundles as reinforcements and polypropylene resin as the main component of the matrix to form a carbon fiber reinforced polypropylene resin-based composite material.

[0048] Furthermore, an adhesive layer 8 is provided between the sheath layer 5 and the armor layer 6 of this embodiment, and the adhesive is arranged on the outside of the sheath layer 5 in a uniform coating manner; in order to improve the bonding performance of the adhesive, the adhesive of this embodiment adopts maleic anhydride grafted polypropylene adhesive. The adhesive layer 8 cooperates with the armor layer 6 and the sheath layer 5 to make the three tightly bonded, ensuring that there is no air gap inside the armor layer 6, thereby avoiding local discharge failures and hazards caused by air gaps. With maleic anhydride grafted polypropylene adhesive as the adhesive layer 8 and carbon fiber reinforced polypropylene resin composite material as the armor layer 6, the chemical composition of the two conforms to the principle of similar compatibility, and the adhesive can play a better role.

[0049] Example 2

[0050] The present embodiment provides a submarine single-core power cable, which includes from the inside to the outside in the radial direction: a core 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a sheath layer 5, an armor layer 6 and an outer coating layer 7. Except for the armor layer 6, the other seven layers are all prior art and will not be described in detail here. The present embodiment improves the material used for the armor layer. Specifically, the armor layer is composed of a carbon fiber composite material, which is prepared with a polymer as a matrix and carbon fiber as a reinforcing material. Since the cable of the present embodiment is used on the seabed, a water-blocking buffer layer 9 for water blocking and pressure buffering is provided between the insulating shielding layer 4 and the sheath layer 5. The submarine single-core power cable of the present embodiment uses a carbon fiber composite material as the armor layer, and its function and the technical effect that can be achieved are the same as those in Example 1, and will not be repeated here.

[0051] Similar to Example 1, the carbon fiber composite material of this embodiment can also be armored on the outside of the sheath layer 5 in the form of continuous tows by three-dimensional weaving; it can also be armored on the outside of the sheath layer 5 in the form of continuous thin strips by tape winding. Further, when the tape winding method is adopted, the thickness of the continuous thin strip can be 0.1-0.8mm, preferably 0.3mm; the width of the continuous thin strip is 10mm-100mm, preferably 50mm. When the carbon fiber composite material used in the armor layer 6 is a strip with a width of 50mm and a thickness of 0.3mm, in addition to ensuring the mechanical strength and anti-corrosion function required by the armor layer 5, the bending performance of the cable is more superior.

[0052] Further, similar to Example 1, the polymer matrix of this embodiment may also include the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer. The above components are mixed by mechanical stirring to form a polymer matrix. The resin is an epoxy resin material. The inorganic nanoparticles of this embodiment are CaCO3 whiskers, and the other components are all prior art and will not be repeated here. This embodiment uses 12K carbon fiber continuous filament bundles as reinforcement and epoxy resin as the main component of the matrix to form a carbon fiber reinforced epoxy resin-based composite material.

[0053] Furthermore, an adhesive layer 8 is provided between the sheath layer 5 and the armor layer 6 of the present embodiment. In order to improve the bonding performance of the adhesive, the adhesive adopts epoxy resin adhesive. An inner lining layer 10 is provided between the sheath layer 5 and the adhesive layer 8. The inner lining layer 10 is used to provide mechanical protection and anti-corrosion protection to the sheath layer 5 when the cable is bent. The adhesive is arranged on the outside of the inner lining layer 10 in a uniform coating manner. The coordinated cooperation of the adhesive layer 8, the armor layer 6 and the inner lining layer 10 makes the three tightly bonded, ensuring that there is no air gap inside the armor layer 6, thereby avoiding local discharge failures and hazards caused by air gaps. Using epoxy resin adhesive as the adhesive layer 8 and carbon fiber reinforced epoxy resin composite material as the armor layer 6, the chemical composition of the two conforms to the principle of similar compatibility, and the adhesive effect can be better exerted.

[0054] Example 3

[0055] The present embodiment provides a submarine single-core composite cable, which includes from the inside to the outside in the radial direction: a core 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a sheath layer 5, an armor layer 6 and an outer coating layer 7. Except for the armor layer 6, the other seven layers are all prior art and will not be described in detail here. The present embodiment improves the material used in the armor layer. Specifically, the armor layer is composed of a carbon fiber composite material, which is prepared with a polymer as a matrix and carbon fiber as a reinforcing material. Since the cable of this embodiment is also used on the seabed like Example 2, a water-blocking buffer layer 9 for water blocking and buffering pressure is provided between the insulating shielding layer 4 and the sheath layer 5. The submarine single-core power cable of this embodiment uses a carbon fiber composite material as an armor layer, and its function and the technical effects that can be achieved are the same as those of Examples 1 and 2, and will not be repeated here. The difference from Example 2 is that an optical fiber unit layer for transmitting communication signals is provided between the sheath layer 5 and the armor layer 6 (the layer is provided with at least one optical fiber 11).

[0056] Similar to Example 2, the carbon fiber composite material of this embodiment can also be armored on the outside of the sheath layer 5 in the form of continuous tows by three-dimensional weaving; it can also be armored on the outside of the sheath layer 5 in the form of continuous thin strips by tape winding. Further, when the tape winding method is adopted, the thickness of the continuous thin strip can be 0.1-0.8mm, preferably 0.3mm; the width of the continuous thin strip is 10mm-100mm, preferably 50mm. When the carbon fiber composite material used in the armor layer 6 is a strip with a width of 50mm and a thickness of 0.3mm, in addition to ensuring the mechanical strength and anti-corrosion function required by the armor layer 5, the bending performance of the cable is more superior.

[0057] Further, similar to Example 2, the polymer matrix of this embodiment may also include the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer. The above components are mixed by mechanical stirring to form a polymer matrix. The resin is an epoxy resin material. The inorganic nanoparticles of this embodiment are CaCO3 whiskers, and the other components are all prior art and will not be repeated here. This embodiment uses 24K carbon fiber continuous filament bundles as reinforcement and epoxy resin as the main component of the matrix to form a carbon fiber reinforced epoxy resin-based composite material.

[0058] Further, similar to Example 2, an adhesive layer 8 is provided between the sheath layer 5 and the armor layer 6 of this embodiment. In order to improve the bonding performance of the adhesive, the adhesive adopts epoxy resin adhesive. An inner lining layer 10 is provided between the sheath layer 5 and the adhesive layer 8. The inner lining layer 10 is used to provide mechanical protection and anti-corrosion protection to the sheath layer 5 when the cable is bent. The adhesive is arranged on the outside of the inner lining layer 10 in a uniform coating manner. The synergy of the adhesive layer 8, the armor layer 6 and the inner lining layer 10 is utilized to make the three tightly bonded, ensuring that there is no air gap inside the armor layer 6, thereby avoiding partial discharge failures and hazards caused by air gaps. Using epoxy resin adhesive as the adhesive layer 8 and carbon fiber reinforced epoxy resin composite material as the armor layer 6, the chemical composition of the two conforms to the principle of similar compatibility, and the adhesive effect can be better exerted.

[0059] Furthermore, different from Example 2, the optical fiber unit layer (with at least one optical fiber 11 therein) of this embodiment is arranged between the sheath layer 5 and the inner lining layer 10, and the optical fiber unit layer is filled with one or more of a glue potting agent, foam plastic, soft plastic, and polyester fiber. The filling structure 12 of the optical fiber unit layer plays a supporting and reinforcing role around the optical fiber, which can effectively increase the strength of the optical fiber and improve its tensile strength and bending strength. The filling structure can withstand forces in different directions such as stretching, tearing, and flattening during installation and maintenance, thereby improving the mechanical properties of the optical fiber unit layer and increasing its service life. In addition, the filling structure can maintain the roundness of the optical cable and avoid deformation and flattening.

[0060] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A single-core power cable, which includes from the inside to the outside in the radial direction: A wire core, a conductor shielding layer, an insulating layer, an insulating shielding layer, a sheath layer, an armor layer and an outer covering layer, wherein the armor layer is composed of a carbon fiber composite material, which is prepared with a polymer as a matrix and carbon fiber as a reinforcing material.

2. The single-core power cable according to claim 1, characterized in that: The carbon fiber composite material is armored on the outside of the sheath layer in the form of continuous filament bundles through three-dimensional weaving; or, in the form of continuous thin strips, armored on the outside of the sheath layer through strip winding.

3. The single-core power cable according to claim 2, characterized in that: The thickness of the continuous thin strip is 0.1-0.8 mm, preferably 0.3 mm; the width of the continuous thin strip is 10 mm-100 mm, preferably 50 mm.

4. The single-core power cable according to claim 1, characterized in that: The polymer matrix comprises the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer; the components are mixed by mechanical stirring to form a polymer matrix; the resin is made of polypropylene resin material.

5. The single-core power cable according to claim 4, characterized in that: An adhesive layer is provided between the sheath layer and the armor layer. The adhesive is arranged on the outer side of the sheath layer in a uniform coating manner. The adhesive is maleic anhydride grafted polypropylene adhesive.

6. A single-core power cable, used on the seabed, the cable radial direction from inside to outside includes: A wire core, a conductor shielding layer, an insulating layer, an insulating shielding layer, a sheath layer, an armor layer and an outer covering layer, characterized in that the armor layer is composed of a carbon fiber composite material, which is prepared with a polymer as a matrix and carbon fiber as a reinforcing material; a water-blocking buffer layer for blocking water and buffering pressure is provided between the insulating shielding layer and the sheath layer.

7. The single-core power cable according to claim 6, characterized in that: The carbon fiber composite material is armored on the outside of the sheath layer in the form of continuous filament bundles through three-dimensional weaving; or, in the form of continuous thin strips, armored on the outside of the sheath layer through strip winding.

8. The single-core power cable according to claim 7, characterized in that: The thickness of the continuous thin strip is 0.1-0.8 mm, preferably 0.3 mm; the width of the continuous thin strip is 10 mm-100 mm, preferably 50 mm.

9. The single-core power cable according to claim 6, characterized in that: The polymer matrix comprises the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer; the components are mixed by mechanical stirring to form a polymer matrix; the resin is epoxy resin material.

10. The single-core power cable according to claim 9, characterized in that: An adhesive layer is provided between the sheath layer and the armor layer, and the adhesive is epoxy resin adhesive.

11. The single-core power cable according to claim 10, characterized in that: An inner lining layer is provided between the sheath layer and the adhesive layer, and is used for providing mechanical and anti-corrosion protection to the sheath layer when the cable is bent; the adhesive is provided on the outer side of the inner lining layer in a uniformly coated manner.

12. A single-core composite cable, used on the seabed, the cable radial direction from inside to outside includes: A wire core, a conductor shielding layer, an insulating layer, an insulating shielding layer, a sheath layer, an armor layer and an outer covering layer, characterized in that the armor layer is composed of a carbon fiber composite material, which is prepared with a polymer as a matrix and carbon fiber as a reinforcing material; an optical fiber unit layer for transmitting communication signals is provided between the sheath layer and the armor layer; a water-blocking buffer layer for blocking water and buffering pressure is provided between the insulating shielding layer and the sheath layer.

13. The single-core composite cable according to claim 12, characterized in that: The carbon fiber composite material is armored on the outside of the sheath layer in the form of continuous filament bundles through three-dimensional weaving; or, in the form of continuous thin strips, armored on the outside of the sheath layer through strip winding.

14. The single-core composite cable according to claim 13, characterized in that: The thickness of the continuous thin strip is 0.1-0.8 mm, preferably 0.3 mm; the width of the continuous thin strip is 10 mm-100 mm, preferably 50 mm.

15. The single-core composite cable according to claim 12, characterized in that: The polymer matrix comprises the following components: 100 parts of resin, 30-60 parts of curing agent, 0.5-2 parts of accelerator, 0.1-3 parts of inorganic nanoparticles, and 0.5-7 parts of interface modification compatibilizer; the components are mixed by mechanical stirring to form a polymer matrix; the resin is epoxy resin material.

16. The single-core composite cable according to claim 12, characterized in that: An adhesive layer is also provided between the sheath layer and the armor layer, and the adhesive is epoxy resin adhesive.

17. The single-core composite cable according to claim 16, characterized in that: An inner lining layer is provided between the sheath layer and the adhesive layer, and is used for providing mechanical and anti-corrosion protection to the sheath layer when the cable is bent; the adhesive is provided on the outer side of the inner lining layer in a uniformly coated manner.

18. The single-core composite cable according to claim 17, characterized in that: The optical fiber unit layer is arranged between the sheath layer and the inner lining layer. The optical fiber unit layer is provided with at least one optical fiber and is filled with one or more of glue potting agent, foam plastic, soft plastic, and polyester fiber.

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