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CYMGRID Based Effective Earthing Design Model for Substation

The main objective of this paper is to develop an effective substation earthing system model to ensure that step and touch potentials are within the acceptable levels using effective design implementation steps with real time data based on the IEEE 80-2000. In this proposed method measurement of soil resistibility has been achieved using four probe wenner methods. The two layer soil resistivity model has been developed and CYMGRD based soil resistivity computations has been implemented. Overall impedance to earth has been calculated and grid potential rise limits has been obtained. Step and Touch potentials has been obtained and identified that the values are lower than allowable step and touch potentials, hence satisfies the design requirements of the substation.