Abstract
Grounding grid materials are vulnerable to soil corrosion, which is detrimental to the safe operation of the grounding grids and even lead to serious accidents of power transmission. In this paper, galvanized steel was used as the typical grounding grid material which was buried in the soil and then electrified with AC and DC current for two weeks. The corroded samples under different current conditions were characterized and compared. The experimental results show that the corrosion degree of galvanized steel gradually aggravated with the increasing of the current, especially under DC current. Further, the mechanism of the influence of current on soil corrosion is explored. It is found that under the same magnitude of current, the corrosion degree of galvanized steel under DC current is greater than that under AC current.
Highlights
Grounding grids are important to ensure the safety of current transmission
Under the ACbehavior current, the oxide film of galvanized sample gradually two weeks of the theforming weight and record theloose data.surface, The results shown stroyed with theexperiment
In this paper, galvanized steel was selected as the grounding grid material as the experimental research object, and different current sizes and types of current were passed into the soil to explore the corrosion of different samples
Summary
Grounding grids are important to ensure the safety of current transmission. When short circuits are caused, they have the function of maintaining voltage balance and releasing electric current [1,2]. When the galvanized steel of the grounding grid fails due to corrosion, the current cannot be spread to the earth in time. In this case, the equivalent resistance and potential of the soil increase greatly, and the voltage in the secondary circuit increases correspondingly, resulting in the failure of the transmission line, even endangering human safety and causing major safety accidents and huge economic loss [2,3,8]. In operating conditions, grounding grid materials need to be applied with electric current in corrosive soil environment, which increases the rate of corrosion and leads to material failure. There were few studies on the corrosion behavior and corrosion mechanism of galvanized steel of grounding grids materials under working conditions. It is expected to provide help for further solving the problems of corrosion and material selection of grounding network equipment
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