Design of substation grounding grid using EDSA software

The grounding grid provides a common ground for the electrical equipment as well all the metallic structures in the substation. Effective Grounding system design is important as it deals with personnel safety and protection of electrical equipment. Earth Fault gives rise to potential gradient within and around the substation. This voltage gradient should not exceed the tolerable human body limit. Substation grounding grid design therefore requires calculating of parameters related to earth and grounding with a great concern for the safety of the persons who may come under the influence of the potential gradient due to severe earth fault. In this paper design of the grounding grid for square and rectangular configuration is done and analysis is done by EDSA (Electrical distribution and system Analysis) software.