TWI649261B - Graphene-containing composite cable - Google Patents

Abstract

The present invention provides a graphene-containing composite cable comprising a core wire; and a conductive coating covering the core wire and extending along an axial direction of the core wire, wherein the conductive coating layer comprises a graphene and a metal, and Based on the conductive coating, the graphene has a volume percentage of between 20% and 50%, thereby allowing current to be transmitted along the graphene covering the core wire, thereby reducing not only resistance but also cause The loss caused by the heat generated by the resistor. Among them, the metal is selected from the group consisting of aluminum, titanium, and alloys thereof.

Description

Graphene-containing composite cable

The invention relates to a cable, in particular to a composite cable containing graphene.

Power cable refers to the cable used in the power system to transmit and distribute high-power electric energy. According to the structure, it can be roughly divided into overhead transmission lines and underground lines.

The overhead transmission line includes a high-voltage cable for carrying high-voltage electricity. The above-mentioned cable often uses a bare wire to save the cost of the insulating material, for example, a plurality of metal wires are twisted to form a seven-strand twisted wire. Because of the relationship between the overhead transmission line erection environment, in addition to good electrical conductivity, it has to have the advantages of good environmental durability, high strength, low thermal expansion coefficient, etc., in order to improve the service life.

For example, the Republic of China Patent Publication No. 196586 discloses a sheath for a high-voltage cable, which is composed of a hollow tubular body made of a resilient insulating material having a slit formed in the longitudinal direction on the pipe wall. A fastening device for fastening the slit along the outer side of the opposite wall of the slit is provided, and a plurality of ribs are provided on the inner side of the hollow tubular body, and the rib of the sheath has the protection The weight of the sleeve increases the elasticity and strength of the sheath, enhances ventilation, prolongs service life and enhances the safety of workers.

In addition to designing to extend the service life of overhead transmission lines including high-voltage cables, on the other hand, the metal wires that make up the cable have a certain resistance, and the resistance increases with temperature, causing current to flow through the metal. Power loss due to resistance during line. In view of this, how to reduce the cable resistance to reduce the loss is also the direction of future efforts.

The main object of the present invention is to solve the disadvantages of conventional cables, particularly high-voltage cables, which are prone to heat generation due to their high electrical resistance.

In order to achieve the above object, the present invention provides a graphene-containing composite cable comprising: a core wire; and a conductive coating covering the core wire and extending along an axial direction of the core wire, wherein the conductive coating layer comprises a graphite The olefin and a metal, and based on the conductive coating, the graphene has a volume percentage of between 20% and 50%. Among them, the metal is selected from the group consisting of aluminum, titanium, and alloys thereof.

In an embodiment of the invention, the core wire includes a first end, a second end remote from the first end, and an intermediate portion between the first end and the second end.

In an embodiment of the invention, the conductive coating extends from the first end of the core along the surface of the intermediate section to the second end.

In an embodiment of the invention, the conductive coating is applied to the entire surface of the intermediate portion of the core to completely cover the core.

In an embodiment of the invention, the core wire is made of steel.

In one embodiment of the invention, the metal is selected from the group consisting of aluminum, titanium, and alloys thereof.

In an embodiment of the invention, the graphenes are arranged along the direction in which the core wires extend and are in contact with each other to form a graphene ribbon.

In an embodiment of the invention, the conductive coating has a thickness between 1% and 20% of the diameter of the core.

Since graphene is an excellent conductor, its electrical resistance is lower than that of commonly used copper or silver. It is also the lowest resistivity in conductive materials, and electrons can move rapidly in graphene. The invention utilizes the conductive coating including graphene to replace the copper skin in the conventional high-voltage cable, and utilizes the high electron mobility and low resistivity characteristics of the graphene to reduce the high resistance of the conventional high-voltage cable. It is easy to generate heat and cause wear and tear.

1‧‧‧Composite cable

10‧‧‧ Conductive coating

101‧‧‧graphene tape

1011‧‧‧ Graphene

20‧‧‧core

201‧‧‧ first end

202‧‧‧ Middle section

203‧‧‧ second end

FIG. 1A is a schematic view of a graphene-containing composite cable according to an embodiment of the present invention.

Fig. 1B is a schematic view of the core wire of Fig. 1A.

Fig. 2 is an enlarged view of a portion of the conductive coating of Fig. 1A.

The detailed description and technical contents of the present invention will now be described with reference to the following drawings: a high-voltage cable of the prior art, the center of which is a supported steel cable, and the outer periphery of the steel cable is covered with copper. In the process of current transmission, most of it is transmitted through the copper skin, but the current passes through the transmission process to cause copper loss due to the heating of the line. In view of the above, the present invention provides a graphene-containing composite cable having a lower electrical resistance than conventional high-voltage cables, thereby reducing the problem that conventional high-voltage cables are prone to heat generation due to high electrical resistance.

Please refer to FIG. 1A, FIG. 1B and FIG. 2, which are schematic diagrams of a graphene-containing composite cable 1 according to an embodiment of the present invention, a schematic diagram of a core 20 of FIG. 1A, and FIG. 1A. A partial enlarged view of the intermediate conductive coating 10.

In an embodiment of the invention, the graphene-containing composite cable 1 comprises a conductive coating 10 and a core wire 20. The core wire 20 includes a first end 201, a second end 203 away from the first end 201, and an intermediate section 202 between the first end 201 and the second end 203, and the conductive coating The layer 10 is formed on the surface of the core wire 20 from the first end 201 of the core wire 20 along the surface of the intermediate segment 202 to the second end 203. In a preferred embodiment, the conductive coating 10 The entire surface of the intermediate section 202 of the core wire 20 is coated to completely cover the core wire 20. The core wire 20 may be made of steel.

The conductive coating 10 is formed of a conductive paste. In a preferred embodiment, the conductive paste is a homogeneous conductive paste comprising a graphene 1011 and a metal uniformly mixed with each other. After being formed into the conductive coating layer 10, the graphene 1011 is present in an amount sufficient to cause the graphene 1011 to be aligned and in contact with each other along the extending direction of the core wire 20, thereby forming at least one graphene ribbon 101 in the conductive coating layer 10. . To achieve the above objective, the volume percentage of the graphene is preferably between 20% and 50%, more preferably between 25% and 45%, and most preferably between 30% and 35%, based on the conductive paste. Between the above, when the volume percentage of the graphene 1011 is in the above range, the graphene 1011 can be sufficiently brought into contact with each other with the least amount of graphene in the most economical condition.

Further, the metal in the conductive coating 10 of the present invention may be aluminum, titanium, or an alloy thereof, and preferably aluminum. This is because aluminum alloy and graphene can form a chemical bond to form aluminum carbide (Al ₄ C ₃ ), so that the fusion property between the components contained in the conductive coating 10 of the present invention is better.

Furthermore, in order to have a better conductive effect, the thickness of the conductive coating 10 is between 1% and 20% of the diameter of the core wire 20, preferably between 5% and 20%, more preferably 8%. Between 12%. If the thickness of the conductive coating 10 exceeds the above range, the ratio of the charge transfer in the radial direction will be too large to be sufficiently transmitted in the axial direction; if it is too thin, the graphene 1011 therein will not be uniformly contacted.

The method for manufacturing the graphene-containing composite cable 1 of the present invention is not particularly limited. For example, a steel cable having a melting point of about 1450 ° C may be used as the core wire 20, and the outer surface of the core wire 20 is plated. The conductive paste is formed such that the conductive paste is formed into the conductive coating 10 to coat the core wire 20, thereby obtaining the graphene-containing composite cable 1 of the present invention. In the above method, the conductive The slurry comprises an aluminum liquid and a graphene 1011 uniformly suspended in the aluminum liquid, and the volume ratio of the aluminum liquid to the graphene 1011 is about 3:1.

The present invention has been described in detail above, but the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the present application should remain within the scope of the patent of the present invention.

Claims (7)

A graphene-containing composite cable comprising: a core wire; and a conductive coating covering the core wire and extending along an axial direction of the core wire, wherein the conductive coating layer comprises a graphene and a metal, and Based on the conductive coating, the graphene has a volume percentage between 20% and 50%; wherein the metal is selected from the group consisting of aluminum, titanium, and alloys thereof. The graphene-containing composite cable of claim 1, wherein the core wire comprises: a first end; a second end remote from the first end; and a first end and the first end The middle section between the two ends. The graphene-containing composite cable of claim 2, wherein the conductive coating extends from the first end of the core along the surface of the intermediate section to the second end. The graphene-containing composite cable according to claim 2, wherein the conductive coating is applied to the entire surface of the intermediate portion of the core wire to completely cover the core wire. The graphene-containing composite cable according to claim 1, wherein the core wire is made of steel. The graphene-containing composite cable according to claim 1, wherein the graphene is arranged along the extending direction of the core wire and in contact with each other to form a graphene ribbon. The graphene-containing composite cable according to claim 1, wherein the conductive coating has a thickness of between 1% and 20% of the diameter of the core.