CN-121980804-A - Graphene coating thickness determination method, system, equipment, medium and product

Abstract

The invention relates to the technical field of grounding device design, and discloses a method, a system, equipment, a medium and a product for determining the thickness of a graphene coating, wherein the method determines the skin depth under high-frequency current by combining lightning current frequency according to the conductivity parameter of the graphene coating, combines target impedance according to the conductivity parameter of a coated substrate and the conductivity parameter of the graphene coating under the constraint of the skin depth, the optimal thickness of the graphene coating is determined, so that the graphene coating can effectively utilize the skin effect to concentrate current in a high-conductivity area under the action of high-frequency lightning current, the current concentration area covered by the coating is ensured to meet the conductive requirement, the problem of excessive thickness waste or excessive thickness failure of the coating is avoided, impedance matching can be realized by adjusting the thickness of the coating, the influence of the inductance effect is considered, the total impedance is ensured to be not exceeding a limit value, and the overall conductive performance is ensured to reach the standard.

Inventors

• DONG ZHICONG
• LI CHUIYOU
• XUE XUMING
• ZHOU YI
• Chan Qizhong
• JIANG YUHUAN
• LUO HAIXIN
• ZHU YULIN
• Cai Danxu
• XIANG DAI
• ZHU WENTAN
• LI XINHAI
• WU YIJIANG
• LIANG GUOJIAN
• LI BEI
• ZHANG CHUNMEI
• ZENG LINGCHENG
• WU MIANTING
• XIONG ZHENDONG

Assignees

• 广东电网有限责任公司中山供电局

Dates

Publication Date

20260505

Application Date

20260129

Claims (10)

1. 1. The method for determining the thickness of the graphene coating is characterized by comprising the following steps of: Acquiring conductivity parameters of a coated substrate and conductivity parameters of a graphene coating; according to the conductivity parameters of the graphene coating, the skin depth under high-frequency current is determined by combining the lightning current frequency; And under the constraint of the skin depth, determining the optimal thickness of the graphene coating according to the conductivity parameter of the coated substrate and the conductivity parameter of the graphene coating and combining the target impedance.
2. 2. The graphene coating thickness determination method according to claim 1, wherein the electrical conductivity parameters of the graphene coating include resistivity and magnetic permeability; According to the conductivity parameters of the graphene coating and in combination with the lightning current frequency, determining the skin depth under high-frequency current comprises the following steps: according to the resistivity, the magnetic conductivity and the lightning current frequency of the graphene coating, determining the skin depth under the high-frequency current by using a skin depth formula, wherein the skin depth formula is as follows: Wherein delta is skin depth, Is the resistivity of the graphene coating layer, The magnetic permeability of the graphene coating is shown, and f is the lightning current frequency.
3. 3. The method of claim 2, wherein the conductivity parameters of the coated substrate include a substrate cross-sectional diameter and a substrate length, and wherein the determining the optimal thickness of the graphene coating based on the conductivity parameters of the coated substrate and the conductivity parameters of the graphene coating, in combination with a target impedance, under the constraints of the skin depth comprises: Establishing an alternating current impedance model containing a resistance component and an inductance component, and determining the resistance and the inductance of the graphene coating according to the alternating current impedance model by combining the cross-section diameter of the matrix, the length of the matrix and the resistivity and the magnetic permeability of the graphene coating; Determining the total impedance of the graphene coating according to the resistance and the inductance of the graphene coating; and determining the optimal thickness of the graphene coating under the constraint of meeting the skin depth according to the total impedance of the graphene coating and the target impedance.
4. 4. The method for determining the thickness of the graphene coating according to claim 3, wherein determining the optimal thickness of the graphene coating under the constraint of satisfying the skin depth according to the total impedance of the graphene coating and the target impedance comprises: comparing the total impedance of the graphene coating with the target impedance; And if the total impedance is larger than the target impedance, adjusting the thickness of the graphene coating under the constraint of meeting the skin depth, and recalculating the total impedance based on the adjusted thickness of the graphene coating until the condition that the total impedance is not larger than the target impedance is met, and outputting the latest thickness of the graphene coating as the optimal thickness.
5. 5. The method according to claim 4, wherein if the total impedance is greater than the target impedance, adjusting the thickness of the graphene coating under the constraint of satisfying the skin depth, and recalculating the total impedance based on the adjusted thickness of the graphene coating until a condition that the total impedance is not greater than the target impedance is satisfied, and outputting the latest thickness of the graphene coating as the optimal thickness, further comprising: And under the condition that the thickness of the graphene coating does not meet the constraint of the skin depth, adjusting the thickness safety margin of the graphene coating, and revising the thickness of the graphene coating according to the adjusted thickness safety margin of the graphene coating until the thickness of the graphene coating meets the constraint of the skin depth.
6. 6. The method for determining the thickness of the graphene coating according to claim 1, wherein the coated substrate and the graphene coating are connected through a transition layer, and the transition layer is prepared through a high-temperature oxidation process.
7. 7. A graphene coating thickness determination system, comprising: the parameter acquisition module is used for acquiring the conductivity parameters of the coated substrate and the conductivity parameters of the graphene coating; the skin depth determining module is used for determining skin depth under high-frequency current according to the conductivity parameters of the graphene coating and the lightning current frequency; And the coating thickness determining module is used for determining the optimal thickness of the graphene coating according to the conductivity parameter of the coated substrate and the conductivity parameter of the graphene coating and the target impedance under the constraint of the skin depth.
8. 8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that, when executed by the processor, causes the processor to perform the steps of the graphene coating thickness determination method according to any one of claims 1-6.
9. 9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed, implements the steps of the graphene coating thickness determination method according to any one of claims 1-6.
10. 10. A computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions, wherein the program instructions, when executed by a computer, cause the computer to perform the steps of the graphene coating thickness determination method according to any one of claims 1-6.

Description

Graphene coating thickness determination method, system, equipment, medium and product Technical Field The invention relates to the technical field of grounding device design, in particular to a graphene coating thickness determining method, a graphene coating thickness determining system, graphene coating thickness determining equipment, graphene coating thickness determining medium and graphene coating thickness determining products. Background With the development of the power grid construction to the ultra-high voltage and large capacity, the grounding device is used as a core component for guaranteeing the safe and stable operation of the power system, and the requirements of high-conductivity current dispersion and stable structure are simultaneously met under the complex working condition. At present, a large amount of grounding materials adopt a low-conductivity matrix (such as silicon-aluminum alloy, common cast iron and the like) as a structural support body, and the matrix materials have excellent mechanical strength and low cost, but have higher resistivity) Under high-frequency large-current impact such as lightning stroke, the current dispersion speed is low, the grounding resistance is high, and the insulation breakdown of equipment and the personal safety risk are easily caused. In order to improve the conductivity of the low-conductivity substrate, the prior art often adopts a scheme of coating a high-conductivity graphene coating on the surface of the substrate. However, the existing coating thickness design has the obvious defects that firstly, the skin effect principle is not fully utilized, current can be concentrated on the surface of a conductor for transmission under high-frequency high current, the traditional thickness design is not matched with the skin depth, the current concentration area cannot be covered if the traditional thickness design is too thin, material waste is caused and coating falling is easy to occur if the traditional thickness design is too thick, secondly, the influence of inductance on impedance under a high-frequency scene is ignored, the lightning current frequency can reach 1 kHz-10 MHz, the total impedance can be obviously increased by inductance, and the integral conductivity can not be guaranteed to reach the standard. The problem causes that the conductive lifting effect of the grounding material of the existing graphene coating is limited, the grounding resistance fluctuation is large, and the severe requirements of the grounding system of the ultra-high voltage electric network are difficult to meet. Disclosure of Invention In view of the above, the present invention provides a method, a system, a device, a medium and a product for determining the thickness of a graphene coating. The first aspect of the invention provides a graphene coating thickness determination method, which comprises the following steps: Acquiring conductivity parameters of a coated substrate and conductivity parameters of a graphene coating; according to the conductivity parameters of the graphene coating, the skin depth under high-frequency current is determined by combining the lightning current frequency; And under the constraint of the skin depth, determining the optimal thickness of the graphene coating according to the conductivity parameter of the coated substrate and the conductivity parameter of the graphene coating and combining the target impedance. Preferably, the conductivity parameters of the graphene coating include resistivity and permeability; According to the conductivity parameters of the graphene coating and in combination with the lightning current frequency, determining the skin depth under high-frequency current comprises the following steps: according to the resistivity, the magnetic conductivity and the lightning current frequency of the graphene coating, determining the skin depth under the high-frequency current by using a skin depth formula, wherein the skin depth formula is as follows: Wherein delta is skin depth, Is the resistivity of the graphene coating layer,The magnetic permeability of the graphene coating is shown, and f is the lightning current frequency. Preferably, the conductance parameters of the coated substrate comprise a substrate cross-section diameter and a substrate length, and the determining the optimal thickness of the graphene coating according to the conductance parameters of the coated substrate and the conductance parameters of the graphene coating and combined with a target impedance under the constraint of the skin depth comprises: Establishing an alternating current impedance model containing a resistance component and an inductance component, and determining the resistance and the inductance of the graphene coating according to the alternating current impedance model by combining the cross-section diameter of the matrix, the length of the matrix and the resistivity and the magnetic permeability of the graphene coating; Dete