Optimization of 110kV Substation Grounding Grid in Ankang Area

The grounding resistance of certain 110 kV substation in Ankang area is a bit higher than the required value.This paper builds a soil model for the substation,develops a program to calculate the grounding resistance,touch voltage and step voltage.Based on this program,the major factors affecting the grounding resistance are discussed and the measures to decrease the grounding resistance are put out.The grounding grids are optimized by using the concept of compression ratio.After the optimization,the parameters of the grounding grid satisfy the engineering requirements.