Abstract
This research presents the analysis of substations with unequally spaced grounding grid design. The parameters used for analysis are touch voltage, step voltage, grid resistance, and ground potential rise (GPR). The research problem has been taken from IEEE standard 80–2013 appendix 2, the rectangular grid of size 84m×63m has been analyzed for equally as well unequally spaced grounding grid using Mat lab software and SES Auto Grid Pro software respectively. For unequally spaced substation grounding grid, the conductor spacing has been obtained using Mat lab software. The results obtained for equally spaced grounding grid and unequally spaced grounding grid are compared for the parameters like most dangerous touch voltage, step voltage, grid resistance, GPR, and percentage of saving in the length of grid conductor. The results reveal that, by keeping the attainable safety touch voltage within the permissible limit defined by IEEE Standard 80–2013, the saving in the length of the grounding grid conductor is around 28 percent.
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