CN216562543U

CN216562543U - Graphene composite high-semiconductivity inner-outer shielding impact-resistant medium-voltage power cable

Info

Publication number: CN216562543U
Application number: CN202122926030.3U
Authority: CN
Inventors: 黄万里; 王志辉; 赵迪; 欧阳湘璋; 张玉新; 周优; 姚洪清
Original assignee: Guangzhou Nanyang Cable Group Co ltd
Current assignee: Guangzhou Nanyang Cable Group Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-05-17
Anticipated expiration: 2031-11-25

Abstract

The utility model discloses a graphene composite high-semiconductive internal and external shielding impact-resistant medium-voltage power cable which comprises a conductor, a conductor shielding layer, an insulating shielding layer, a semiconductive buffer layer, a metal shielding layer, a wrapped heat insulation layer and an impact-resistant outer protective layer, wherein the conductor, the conductor shielding layer, the insulating shielding layer, the semiconductive buffer layer, the metal shielding layer, the wrapped heat insulation layer and the impact-resistant outer protective layer are sequentially arranged from inside to outside; the semi-conductive buffer layer comprises a semi-conductive nylon belt and knitting cotton, and the semi-conductive nylon belt and the knitting cotton are compounded to form the semi-conductive buffer layer; the outer sheath is made of foamed polyolefin, and the knitted cotton structure is fluffy, so that the impact of a metal shielding structure or a sheath in the semi-conductive buffer layer can be effectively reduced by the semi-conductive buffer layer.

Description

Graphene composite high-semiconductivity inner-outer shielding impact-resistant medium-voltage power cable

Technical Field

The utility model relates to the field of power cables, in particular to a graphene composite high-semiconductive internal and external shielding impact-resistant medium-voltage power cable.

Background

The graphene is a novel material with high conductivity, and can improve the effect of the cable in shielding a homogenized electric field by being filled in the shielding material of the cable, and the long-term operation reliability of the cable is improved. Compared with a cable produced by a traditional semiconductive shielding material, the graphene composite high semiconductive shielding cable has the advantages that the appearance of an insulated wire core is smoother, the conductivity of semiconductive shielding plastic of the cable is improved by more than 10 times, the thermal stability is also greatly improved, the electric field is more uniform, the reliability and the safety of the operation of the cable are improved, and the service life of the cable is prolonged. But the cost of the graphene composite high-conductivity shielding material is higher than that of the traditional shielding material. And the medium voltage cable on the existing market is not strong in impact resistance, the transmission performance and the transmission efficiency of the cable can be greatly influenced by external impact or impact, and the operation stability is greatly influenced.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the graphene composite high-semiconductivity internal-external shielding impact-resistant medium-voltage power cable provided by the utility model can improve the impact resistance of the cable.

The graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable comprises a conductor, a conductor shielding layer, an insulating shielding layer, a semiconductive buffer layer, a metal shielding layer, a wrapped heat insulation layer and an impact-resistant outer protective layer which are sequentially arranged from inside to outside; the semiconductive buffer layer comprises a semiconductive nylon belt and knitting cotton, and the semiconductive nylon belt and the knitting cotton are compounded to form the semiconductive buffer layer; the material of the anti-impact outer protective layer is foamed polyolefin.

According to the embodiment of the utility model, the graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable at least has the following beneficial effects: because the knitted cotton structure is fluffy, the impact of the metal shielding structure or the sheath to the inside of the semi-conductive buffer layer can be effectively reduced by the semi-conductive buffer layer, compared with a common polyolefin sheath, the anti-impact outer sheath formed by adopting the foamed polyolefin can have better toughness and anti-cracking performance, and the anti-impact performance is better than that of a metal armor structure, so that the anti-impact performance of the cable can be improved, and the weight of the cable is effectively reduced.

According to some embodiments of the utility model, the material of the conductor shield layer and the insulation shield layer is a graphene composite shield.

According to some embodiments of the utility model, the material of the insulating layer is a chemically cross-linked polyethylene material.

According to some embodiments of the utility model, the metal shielding layer comprises annealed soft copper wires and copper strips, and the annealed soft copper wires and the copper strips are both sparsely wound on the outer layer of the semi-conductive buffer layer.

According to some embodiments of the utility model, the material of the wrapped thermal insulation layer is a polyester fiber tape.

According to some embodiments of the utility model, the conductor comprises monofilaments shaped as a profile, the conductor being formed by stranding the monofilaments.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic cross-sectional structure view of a graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable according to an embodiment of the utility model;

reference numerals:

conductor 100, conductor shielding layer 200, insulating layer 300, insulating shielding layer 400, semi-conductive buffer layer 500, metal shielding layer 600, around package insulating layer 700, outer jacket 800 shocks resistance.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to the orientation description, such as the directions of up, down, front, rear, left, right, etc., may be based on those shown in the drawings, only for convenience of description and simplification of description, and does 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 thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and more than, less than, more than, etc. are understood as excluding the present number, and more than, less than, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

Referring to fig. 1, the utility model provides a graphene composite high-semiconductive internal and external shielding impact-resistant medium-voltage power cable, which comprises a conductor 100, a conductor shielding layer 200, an insulating layer 300, an insulating shielding layer 400, a semiconductive buffer layer 500, a metal shielding layer 600, a wrapped heat insulation layer 700 and an impact-resistant outer protective layer 800 which are sequentially arranged from inside to outside; the semiconductive buffer layer 500 comprises a semiconductive nylon belt and knitting cotton, and the semiconductive nylon belt and the knitting cotton are compounded to form the semiconductive buffer layer 500; the material of the impact-resistant outer sheath 800 is foamed polyolefin.

The knitted cotton is fluffy in structure, so that the impact of a metal shielding structure or a sheath structure on the structure above the semi-conductive buffer layer 500 can be effectively reduced, and the structures such as the conductor 100 and the like can be effectively protected when the cable is impacted. And the weight of the semiconductive nylon belt and the knitted cotton is light, so that the weight of the cable can be effectively reduced. The outer jacket 800 that shocks resistance adopts the foaming polyolefin material to form the sheath, compares in ordinary polyolefin sheath, and the foaming polyolefin has better toughness and anti-cracking performance, and crashproof performance is also better than traditional metal armor structure, and weight is lighter simultaneously, also can reduction in production cost when lightening cable weight. It can be understood that the production mode of the semiconductive buffer layer 500 can be continuous lapping and wrapping, and the lapping rate is 10% to 20%; the thickness of the impact-resistant outer sheath 800 is 1.7mm to 2.7 mm.

In some embodiments of the present invention, the material of the conductor shielding layer 200 and the insulation shielding layer 400 is graphene composite shielding material.

Conductor shielding layer 200 and insulation shielding layer 400 adopt the compound high semi-conductive shielding material of graphite alkene, compare in traditional shielding material, and electric conductivity is better, and the smooth flawless of shielding layer that forms has effectively improved the electric conductive property and the electric field homogenization effect of shielding layer, can effectively reduce the partial discharge phenomenon that probably appears in the cable operation simultaneously, guarantees the reliability of cable operation, improves the operation life of cable. It is understood that conductor shield 200 and insulation shield 400 have an average thickness of 0.7 mm.

In some embodiments of the present invention, the material of the insulating layer 300 is a chemically cross-linked polyethylene material.

In some embodiments of the present invention, the metal shielding layer 600 comprises annealed soft copper wires and copper strips, both of which are sparsely wrapped around the outer layer of the semi-conductive buffer layer 500.

The annealing soft copper wire has good electric conductivity, and the copper wire can shield the electromagnetic field that arouses when the cable circular telegram within metal shield 600, can reduce the electromagnetic interference of external production inwards, can also homogenize the electric field simultaneously, prevents axial discharge. The copper strips are loosely wound to generate a shielding effect, and meanwhile, the copper wires can be tightened, so that the influence of the displacement of the copper wires on the shielding efficiency in the bending or laying process is prevented. It can be understood that the diameter of the copper wire is 0.8mm, the average gap between adjacent copper wires is not more than 4mm, the width of the red copper strip is 0.2mm, and the thickness of the red copper strip is 0.12 mm.

In some embodiments of the present invention, the wrapping insulation layer 700 is made of polyester fiber tape.

Wrapping insulating layer 700 can prevent that metallic shield 600 from being heated the oxidation, and when crowded package outer jacket, the outer jacket 800 plastics temperature that shocks resistance is higher, if direct crowded package is in metallic shield 600's outside, the copper wire is heated the oxidation easily, can lead to metallic shield 600's electric conductive property to reduce, the resistance is inhomogeneous, takes place partial discharge easily. The polyester fiber tape is tough, light and thin, has certain heat insulation property, and can protect the impact-resistant outer protective layer 800 from being worn by the metal shielding layer 600 when the cable is bent while preventing the metal shielding layer 600 from being oxidized by heat. It can be understood that the production mode of the lapping heat insulation layer 700 is continuous lapping, the lapping rate is 20% to 30%, and the average thickness of the polyester fiber tape is 0.2 mm.

In some embodiments of the present invention, conductor 100 comprises monofilaments, the monofilaments are shaped as a profile, and conductor 100 is formed by stranding the monofilaments.

The molded lines are lines with the cross sections not in a circular shape, compared with the conventional method for tightly pressing and twisting round monofilaments, the conductor 100 formed by tightly pressing and twisting the molded lines is small in pressing coefficient, compact and compact, small in gaps among the monofilaments and round in the outermost layer, so that the shielding material can be prevented from being embedded into the conductor 100, the generation of partial discharge can be reduced, the outer diameter of the conductor 100 can be reduced, and the production cost is effectively reduced.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims

1. The utility model provides a compound high semi-conductive interior outer shield of graphite alkene middling pressure power cable that shocks resistance which characterized in that: the cable comprises a conductor, a conductor shielding layer, an insulating shielding layer, a semi-conductive buffer layer, a metal shielding layer, a wrapped heat insulation layer and an anti-impact outer protective layer which are sequentially arranged from inside to outside;

the semiconductive buffer layer comprises a semiconductive nylon belt and knitting cotton, and the semiconductive nylon belt and the knitting cotton are compounded to form the semiconductive buffer layer;

the material of the anti-impact outer protective layer is foamed polyolefin.

2. The graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable according to claim 1, characterized in that: the conductor shielding layer and the insulation shielding layer are made of graphene composite shielding materials.

3. The graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable according to claim 1, characterized in that: the insulating layer is made of a chemically cross-linked polyethylene material.

4. The graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable according to claim 1, characterized in that: the metal shielding layer comprises an annealed soft copper wire and a red copper strip, and the annealed soft copper wire and the red copper strip are sparsely wound on the outer layer of the semi-conductive buffer layer.

5. The graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable according to claim 1, characterized in that: the material of the wrapping heat insulation layer is a polyester fiber tape.

6. The graphene composite high-semiconductive inner-outer shielding impact-resistant medium-voltage power cable according to claim 1, characterized in that: the conductor comprises monofilaments, the monofilaments are shaped into molded lines, and the conductor is formed by twisting the monofilaments.