220kV Substation Grounding Grid Security Analysis

In this paper, a 220kV substation grounding grid is taken as an example to analyze the security of the system. Based on the constant current field theory, the surface charge method and Green function are used to calculate and analyze the parameters of the grounding grid, such as grounding resistance, potential distribution, potential gradient, step voltage and touch voltage. According to the above calculated results, the paper analyzes and evaluates the security and reliability of the substation grounding grid. The paper also put forwards some suggestions on better operation of the substation, which can highly improve the security and reliability of substation grounding grids.