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During ground faults, fault current flows in the ground which results in potential gradient and ground potential rise (GPR). The potential gradient affects the safety of operating person due to step and touch voltage and GPR affects the insulation of protective devices and control cables. The potential gradient and GPR are the functions of ground electrode geometry. In this paper, performance assessment and analysis of grounding grid is carried out for different types of grid electrodes with two layer soil model for both positive and negative reflection factor K. The simulation is carried out to evaluate grounding grid performance indices such as Ground resistance, Mesh voltage, Step voltage, Ground Potential Rise. The various parameters used for the simulation are, depth of ground grid, Number of meshes and length of ground rods. The results are tabulated, and discussed. The SES Autogrid Pro grounding software, Canada is used for the analysis.
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Unde et al. (2012) studied this question.
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