The grounding system of a practical 500 kV substation, in which the ground grid is made from steel, is calculated by virtue of the CDEGS software. The model of the soil is established based on the soil resistivity measurements. The safety of the grounding system is evaluated. The influence is analyzed of soil and conductor of ground grid on the safety of the grounding system through large computation under the condition of various soil resistivity, conductor permeability, and conductor conductivity. The influence of soil on the safety of the grounding system is also analyzed when the ground conductor is assumed to be copper.
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