With the continuous development of the power system, lightning strikes and tripping accidents on transmission lines are also increasing. According to the classification statistics of power grid faults, in areas with high tripping rates in China, the number of accidents caused by lightning strikes accounts for about 60% of the total tripping times of high-voltage transmission lines. Over the years, various countries have conducted extensive research on improving the lightning protection level of transmission lines, proposing various measures such as using unbalanced insulation, installing coupled ground wires, reducing line protection angles, lowering the grounding resistance of tower grounding grids, and installing lightning arresters. Below, the editor of graphite grounding will lead everyone to understand it together.

The actual lightning protection effect of operating transmission lines shows that a low resistance grounding grid is an important reference indicator for improving the lightning resistance level of transmission lines. Reducing the grounding resistance of grounding towers is the most economical and effective lightning protection improvement measure. Years of experience in transmission line operation have also led researchers to reach a consensus on this point.

The editor of graphite grounding reminds you that currently, the grounding grid of transmission line towers still mostly uses corrosive metal materials such as flat iron, round steel, galvanized steel, etc., which will face long-term metal corrosion effects. Especially in soil with acidic, alkaline, high salt content, and high water content, it usually takes 5-7 years to renovate or even replace the tower grounding network, which greatly increases the overall life cycle cost [5,6]. In addition, the grounding grid of transmission line towers faces problems such as high construction difficulty, low soil adhesion, and easy theft and damage during use.

In recent years, copper coated steel has been applied in the grounding grid of transmission lines and has a certain anti-corrosion effect. However, when there are gaps or damages in the copper coating, it can accelerate the corrosion of the steel to a certain extent [8]. At present, researchers have conducted extensive research on the impact grounding characteristics, numerical calculation models, resistance reduction methods, and breakpoint diagnosis of grounding grids. However, there is relatively little discussion on how to solve the practical problems of existing grounding grids from a material perspective [9,10]. Developing new grounding materials has practical engineering significance for the renovation of transmission line grounding grids.

The editor of graphite grounding learned about the problems of corrosion, transportation and construction difficulties, low soil adhesion, easy theft and frequent human damage that exist in current metal grounding materials. Therefore, a new type of grounding material - flexible graphite composite grounding material - has been designed and prepared.

The editor of graphite grounding believes that discussing the structural characteristics and basic material parameters of new grounding materials, comparing and analyzing the inductance effect, skin effect and other grounding characteristics of graphite composite grounding materials with copper and steel materials, and based on this, improving the structure of grounding materials, and combining with practical grounding engineering applications, the practical application value of the new grounding material described in this article is explained.