CN112017817B - High-voltage power cable with smooth flatness sheath structure and manufacturing method thereof - Google Patents
High-voltage power cable with smooth flatness sheath structure and manufacturing method thereof Download PDFInfo
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- CN112017817B CN112017817B CN202010902964.0A CN202010902964A CN112017817B CN 112017817 B CN112017817 B CN 112017817B CN 202010902964 A CN202010902964 A CN 202010902964A CN 112017817 B CN112017817 B CN 112017817B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/20—Metal tubes, e.g. lead sheaths
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
- H01B7/20—Metal tubes, e.g. lead sheaths
- H01B7/205—Metal tubes, e.g. lead sheaths composed of aluminium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/2806—Protection against damage caused by corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
- H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
Abstract
The invention discloses a high-voltage power cable with a smooth sheath structure, which comprises a conductor, wherein a conductor shielding layer is wound outside the conductor, an insulating layer and an insulating shielding layer are sequentially extruded outside the conductor shielding layer, a semi-conductive water-blocking layer is wound outside the insulating shielding layer, a smooth tubular metal sheath layer is wrapped outside the semi-conductive water-blocking layer, an anti-corrosion layer is extruded or coated outside the metal sheath layer, an outer sheath and a semi-conductive layer are sequentially extruded outside the anti-corrosion layer, a negative gap is formed between the inner diameter of the metal sheath layer and the semi-conductive water-blocking layer, and the gap value is-2 mm to-1 mm. The invention reduces the outer diameter of the power cable and reduces the risk of floating potential.
Description
Technical Field
The present invention relates to a high voltage power cable and a method for manufacturing the same, and more particularly, to a high voltage power cable having a smooth sheath structure and a method for manufacturing the same.
Background
The high-voltage power cable with the corrugated aluminum sheath structure is developed in the sixty-seven decades of the 20 th century, is popularized and applied in the world for nearly 50 years, and the metal shielding of the high-voltage power cable with the corrugated aluminum sheath structure is the corrugated aluminum sheath structure at present in China, so that more and more problems are exposed at present along with the introduction of the structure and the increase of the application amount. The most typical problems are breakdown failure of the cable body and poor water resistance caused by gap discharge, corrosion and white spot oxidation under the structural characteristic type.
At the same time, the production control is also influenced by the structural type, since the expansion coefficient of the crosslinked insulation of the insulated wire core is about an order of magnitude greater than that of the metal, and therefore a sufficient expansion gap must be left in the corrugated metal sleeve. If the gap is not large enough or not large enough, the insulation will leave a dimple on its surface after expansion, which affects the electrical performance of the cable. On the other hand, the spiral corrugation of the corrugated aluminum-sheathed crosslinked cable does not provide the cable with longitudinal water-blocking function, and if the longitudinal water-blocking performance is improved, the clearance is required to be reduced as much as possible, and further the indentation is caused.
Therefore, those skilled in the art have made an effort to develop a high voltage power cable having a smooth sheath structure with flatness and a method for manufacturing the same, which reduces the outer diameter of the power cable and the risk of a floating potential.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a high-voltage power cable with a smooth sheath structure and a method for manufacturing the same, which can reduce the outer diameter of the power cable and the risk of floating potential.
In order to achieve the purpose, the invention provides a high-voltage power cable with a smooth sheath structure, which comprises a conductor, wherein a conductor shielding layer is wound outside the conductor, an insulating layer and an insulating shielding layer are sequentially extruded outside the conductor shielding layer, a semi-conductive water-blocking layer is wound outside the insulating shielding layer, a smooth tubular metal sheath layer is wrapped outside the semi-conductive water-blocking layer, an anti-corrosion layer is extruded or coated outside the metal sheath layer, an outer sheath and a semi-conductive layer are sequentially extruded outside the anti-corrosion layer, a negative gap is formed between the inner diameter of the metal sheath layer and the semi-conductive water-blocking layer, and the gap value is-2 mm to-1 mm. Adopt pipy the metal jacket layer can the effectual external diameter that reduces the cable, the metal jacket layer with semi-conductive water blocking layer is the negative clearance, and both in close contact with do not have the air gap, reduces the risk of suspension electric potential, has also increased the frictional resistance between the inner and outer structural layer of cable core simultaneously, reduces the risk that the cable core slides to the knot structure and damages because of the dead weight.
Further, the conductor is copper with the purity of more than 99.95% or aluminum with the purity of more than 99.6% and high-conductivity aluminum alloy. The conductivity can be effectively improved by adopting a high-purity conductor.
Further, the conductor shielding layer is composed of a semi-conductive wrapping tape and semi-conductive cross-linked polyethylene. The conductor shielding layer is made of multiple layers of different water-blocking materials, shielding performance is improved, and the conductor is convenient to tighten and homogenize the electric field.
Furthermore, the volume resistivity of the semi-conductive wrapping tape is less than 500 omega-m, the strength is higher than 40N/mm, the volume resistivity of the semi-conductive crosslinked polyethylene at 23 ℃ is less than 1 omega-m, and the tensile strength is higher than 12.0 MPa.
Furthermore, the semi-conductive water-blocking layer is made of a semi-conductive buffer water-blocking tape or a combination of the semi-conductive water-blocking tape and a semi-conductive butyl tape, the volume resistivity of the semi-conductive water-blocking tape is less than 500 omega m, and the surface resistivity of the semi-conductive water-blocking tape is less than 350 omega m.
Further, the outer sheath is made of an insulating grade polyethylene material.
Further, the insulation layer is made of XLPE or blended non-crosslinked polyethylene, and has volume resistivity of more than 1 × 10 at 23 deg.C12Omega.m, tensile strength higher than 17.0 MPa.
Further, the anticorrosive layer is made of hot melt adhesive or vinyl materials.
Further, the volume resistivity of the semiconducting layer is lower than 100 Ω · m.
The invention also provides a method for manufacturing the high-voltage power cable with the smooth flat sheath structure, which comprises the following steps:
1) after the conductor is subjected to wire drawing, annealing and twisting, a semi-conductive wrapping tape is wrapped outside the conductor, and three layers of co-extruded semi-conductive cross-linked polyethylene, an insulating layer and an insulating shielding layer are adopted outside the semi-conductive wrapping tape;
2) the semi-conductive waterproof layer is lapped outside the insulating shielding layer in a single-layer butt joint mode or lapped in two layers in an overlapping mode, the single-layer butt joint clearance rate is larger than 5%, and the overlapping coverage rate of the overlapped lapping is smaller than 35%;
3) after the metal belt is subjected to fine cutting, compression molding and welding, the metal belt is subjected to drawing or compression roller and diameter reduction to form a smooth and round metal sleeve layer, and the metal sleeve layer is sleeved outside the semi-conductive water blocking layer;
4) preheating the metal jacket layer, extruding or coating the anticorrosive layer on the surface of the metal jacket layer, and extruding the outer sheath and the semi-conducting layer on the surface of the anticorrosive layer simultaneously.
The invention has the beneficial effects that: the invention adopts the smooth tubular metal jacket layer, can effectively reduce the outer diameter of the cable, the metal jacket layer and the semi-conductive water-resistant layer are negative gaps, the metal jacket layer and the semi-conductive water-resistant layer are in close contact without air gaps, and the risk of suspension potential is reduced; meanwhile, the friction resistance between the inner and outer structural layers of the cable core is increased, the safe use of the high-voltage large-section cable in a high-fall shaft is facilitated, and the risk of damage to the structure caused by the slippage of the cable core under the action of the dead weight is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "in communication" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, a high voltage power cable with a smooth sheath structure comprises a conductor 1, wherein the conductor 1 is copper with a purity of more than 99.95% or aluminum with a purity of more than 99.6% and high conductivity aluminum alloy, and the cross section and the size of the conductor 1 can be designed according to requirements. The conductor 1 is wrapped by a conductor shielding layer 2, and the conductor shielding layer 2 consists of a semi-conductive wrapping tape and semi-conductive cross-linked polyethylene. The volume resistivity of the semi-conductive wrapping tape is less than 500 omega.m, the strength is higher than 40N/mm, the volume resistivity of the semi-conductive cross-linked polyethylene at 23 ℃ is less than 1 omega.m, and the tensile strength is higher than 12.0 MPa.
The conductor shielding layer 2 is externally sequentially extruded with an insulating layer 3 and an insulating shielding layer 4, and the insulating layer 3 mainly prevents the current leakage of the conductor and plays a role in cable insulation. The insulating layer 3 is made of XLPE or blended non-crosslinked polyethylene and has a volume resistivity of more than 1 x 10 at 23 deg.C12Omega.m, tensile strength higher than 17.0 MPa.
The insulation shielding layer 4 is wrapped with a semi-conductive water-blocking layer 5, the semi-conductive water-blocking layer 5 is used as a connecting medium between insulation and a metal sleeve, the semi-conductive water-blocking layer 5 is made of a semi-conductive buffer water-blocking tape or a combination of the semi-conductive water-blocking tape and a semi-conductive butyl tape, the volume resistivity of the semi-conductive water-blocking tape is less than 500 omega-m, and the surface resistivity of the semi-conductive water-blocking tape is less than 350 omega-m. The main function of the water-blocking layer is to buffer the acting force of the insulating layer 3 and the metal sleeve layer 5 and improve the longitudinal water-blocking function.
The semi-conductive water-resistant layer 5 is wrapped with a smooth tubular metal jacket layer 6, the metal jacket layer 6 can be made of aluminum alloy or copper, the thickness of the metal jacket layer is larger than 2mm when an aluminum alloy jacket is adopted, and the thickness of the metal jacket layer is larger than 1.5mm when a copper jacket is adopted, so that the metal jacket layer cannot play a role of armor when being too thin. The metal jacket layer 6 mainly functions as a metal protective layer for bearing external acting force to protect the inner wire core, and also functions as a metal shielding layer for bearing short-circuit current. A negative clearance is formed between the inner diameter of the metal sleeve layer 6 and the semi-conductive water-resistant layer 5, the clearance value is-2 mm to-1 mm, the metal sleeve layer 6 is externally extruded or coated with an anticorrosive layer 7, and the anticorrosive layer 7 is made of hot melt adhesive or vinyl material with better adhesiveness.
The outer sheath 8 and the semi-conducting layer 9 are sequentially extruded outside the anti-corrosion layer 7, the outer sheath 8 needs to be made of insulating polyethylene or other vinyl or plastic with high strength and excellent insulating property, and the outer sheath, the metal sheath layer 6 and the anti-corrosion layer 7 form a comprehensive protective layer to protect the outer inner wire core from being influenced by the external environment. The semiconductive layer 9 and the outer sheath 8 have the same base material, and the semiconductive function is achieved by adding conductive carbon black component, and the volume resistivity of the semiconductive layer is lower than 100 omega-m.
A method for manufacturing a high-voltage power cable with a smooth sheath structure with flatness comprises the following steps:
1) the conductor 1 is provided with a single-wire drawing die according to the process requirements through drawing equipment, a single wire meeting the requirements is drawn, then the single wire needs to pass through an annealing device to finish annealing of the single wire, the elongation of the annealed single wire is higher than 36%, and the volume resistivity meets the standard requirements. The qualified monofilaments are stranded through a frame stranding machine, the size and the direct current resistance of the stranded conductor need to meet the process and standard requirements, a semi-conductive wrapping tape is wrapped outside the conductor 1, three layers of co-extruded semi-conductive crosslinked polyethylene, an insulating layer 3 and an insulating shielding layer 4 are adopted outside the semi-conductive wrapping tape, the extrusion quality and the cleanliness of each layer are guaranteed, and the extrusion compactness can be guaranteed.
2) The single-layer butt-joint wrapping or two-layer overlapping wrapping semi-conductive water-blocking layer 5 is arranged outside the insulating shielding layer 4, a water-blocking wrapping machine is adopted for production, the production process is single-layer butt-joint wrapping or two-layer overlapping wrapping, the single-layer butt-joint clearance rate is larger than 5%, the overlapping cover rate of the overlapping wrapping is smaller than 35%, and the uniformity of the outer diameter of the wire core after overlapping is guaranteed.
3) The strap is mostly the aluminium strip, through the autogiration cutter, according to the finish cutting width of technological requirement, adjusts the cutting distance of cutter, excises the vertical both sides of strap, and effective side cut ratio is less than 2mm, mainly gets rid of the impurity and the dust on strap both sides etc. ensures welding quality. Then, the metal strip after finish cutting is rounded through a pre-deformation die, a forming die and a sizing die. Closely knit the welding firmly through argon arc welding set with strap joint, strap tensile strength at the welding seam department must not be less than 75MPa, rethread draw gear or compression roller device carry out the tubular metal resonator and reduce the footpath and form smooth and round metal jacket layer 6, overlap metal jacket layer 6 cover outside semi-conductive water-blocking layer 5, both present close contact.
4) The metal jacket layer 6 is preheated at the temperature of about 80 ℃, and the purpose of preheating is to be capable of being firmly combined with the anticorrosive layer 7 better. And extruding or coating the anticorrosive layer 7 on the surface of the metal jacket layer 6, wherein the thickness of the anticorrosive layer is controlled to be 0.2-0.5 mm. The outer sheath 8 and the semiconducting layer 9 are then extruded onto the surface of the corrosion protection layer 7 simultaneously.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A high voltage power cable with smooth sheath structure of flatness, characterized by: the anti-corrosion cable comprises a conductor (1), wherein a conductor shielding layer (2) is wound and wrapped outside the conductor (1), an insulating layer (3) and an insulating shielding layer (4) are sequentially extruded and wrapped outside the conductor shielding layer (2), a semi-conductive water-blocking layer (5) is wound and wrapped outside the insulating shielding layer (4), a smooth tubular metal sleeve layer (6) is wrapped outside the semi-conductive water-blocking layer (5), an anti-corrosion layer (7) is extruded and wrapped outside the metal sleeve layer (6) or coated outside the metal sleeve layer, and an outer sheath (8) and a semi-conductive layer (9) are sequentially extruded and wrapped outside the anti-corrosion layer (7); the semi-conductive waterproof layer (5) is lapped outside the insulation shielding layer (4) in a single-layer butt joint mode or in a double-layer overlapping mode, the single-layer butt joint clearance rate is larger than 5%, and the overlapping rate of the overlapping lapping is smaller than 35%;
and a negative gap is formed between the inner diameter of the metal sleeve layer (6) and the semiconductive water-resistant layer (5), and the gap value is-2 mm to-1 mm.
2. The high voltage power cable with a smooth sheath structure with flatness of claim 1, wherein: the conductor (1) is copper with the purity of more than 99.95 percent or aluminum with the purity of more than 99.6 percent and aluminum alloy with high conductivity.
3. The high voltage power cable with a smooth sheath structure with flatness of claim 1, wherein: the conductor shielding layer (2) is composed of a semi-conductive wrapping tape and semi-conductive cross-linked polyethylene.
4. The high voltage power cable with a smooth sheath structure with flatness of claim 3, wherein: the volume resistivity of the semi-conductive wrapping tape is less than 500 omega.m, the strength is higher than 40N/mm, the volume resistivity of the semi-conductive cross-linked polyethylene at 23 ℃ is less than 1 omega.m, and the tensile strength is higher than 12.0 MPa.
5. The high voltage power cable with a smooth sheath structure with flatness of claim 1, wherein: the semi-conductive water-blocking layer (5) is made of a semi-conductive buffer water-blocking tape or a combination of the semi-conductive water-blocking tape and a semi-conductive butyl tape, the volume resistivity of the semi-conductive water-blocking tape is less than 500 omega-m, and the surface resistivity of the semi-conductive water-blocking tape is less than 350 omega-m.
6. The high voltage power cable with smooth sheath structure with flatness of claim 4, wherein: the outer sheath (8) is made of an insulating grade polyethylene material.
7. According to claimClaim 1 the high voltage power cable with smooth sheath structure of flatness, its characteristic is: the insulating layer (3) is made of XLPE or blended non-crosslinked polyethylene and has a volume resistivity of more than 1 x 10 at 23 DEG C12Omega.m, tensile strength higher than 17.0 MPa.
8. The high voltage power cable with smooth sheath structure with flatness of claim 6, wherein: the anticorrosive layer (7) is made of hot melt adhesive or vinyl materials.
9. The high voltage power cable with a smooth sheath structure with flatness of claim 7, wherein: the volume resistivity of the semiconducting layer (9) is less than 100 Ω · m.
10. A method for manufacturing a high voltage power cable having a smooth sheath structure with flatness according to any of claims 1 to 9, comprising the steps of:
1) after the conductor (1) is subjected to wire drawing, annealing and twisting, a semi-conductive wrapping tape is wrapped outside the conductor (1), and three layers of co-extruded semi-conductive cross-linked polyethylene, an insulating layer (3) and an insulating shielding layer (4) are adopted outside the semi-conductive wrapping tape;
2) the semi-conductive waterproof layer (5) is lapped outside the insulation shielding layer (4) in a single-layer butt joint mode or in a double-layer overlapping mode, the single-layer butt joint clearance rate is larger than 5%, and the overlapping rate of the overlapping lapping is smaller than 35%;
3) after the metal belt is subjected to fine cutting, compression molding and welding, the metal belt is subjected to drawing or compression roller and diameter reduction to form the smooth and round metal sleeve layer (6), and the metal sleeve layer (6) is sleeved outside the semi-conductive water-resistant layer (5);
4) preheating the metal jacket layer (6), coating or coating the anticorrosive layer (7) on the surface of the metal jacket layer (6), and extruding the outer sheath (8) and the semi-conducting layer (9) on the surface of the anticorrosive layer (7) simultaneously.
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| CN202010902964.0A CN112017817B (en) | 2020-09-01 | 2020-09-01 | High-voltage power cable with smooth flatness sheath structure and manufacturing method thereof |
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| CN202010902964.0A CN112017817B (en) | 2020-09-01 | 2020-09-01 | High-voltage power cable with smooth flatness sheath structure and manufacturing method thereof |
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| CN112017817B true CN112017817B (en) | 2022-05-13 |
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| FR2926920B1 (en) * | 2008-01-28 | 2010-04-02 | Areva T&D Ag | ELECTRICITY INSULATING DISK FOR SUPPORTING A LINEAR CONDUCTOR AND ELECTRICAL ASSEMBLY COMPRISING THE DISK. |
| CN104810107A (en) * | 2014-10-11 | 2015-07-29 | 安徽明星电缆有限公司 | Novel electrified railway cable and manufacture process thereof |
| CN107240447A (en) * | 2017-07-19 | 2017-10-10 | 无锡市曙光电缆有限公司 | A kind of smooth aluminium sheath EHV XLPE power cable |
| CN207116098U (en) * | 2017-08-24 | 2018-03-16 | 江苏中超控股股份有限公司 | The flat pipe aluminium sheath high-tension cable of high-mechanic short circuit current |
| CN209657869U (en) * | 2019-05-22 | 2019-11-19 | 中天科技海缆有限公司 | High-tension cable |
| CN110010282A (en) * | 2019-05-23 | 2019-07-12 | 中天科技海缆有限公司 | A kind of cable |
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