The effect of the temperature rise on ESP can be investigated. To calculate the maximum grid current, you firstly need to calculate the worst case symmetrical earth fault current at the facility that. The effect of the depth, length and radius of the model as well as the water resistivities on the ESP is studied. A good earthing grid has low resistance (with respect to remote earth) to minimise ground potential rise (GPR) and consequently avoid dangerous touch and step voltages. The two layer model soil is simulated using two glass tanks that have a conducting connection between different water resistivities via copper rods. ![]() The AC voltage is applied on the scaled models with different configurations as well as the DC voltage. The scale factor of the system is taken as 300 for grounding vertical rod and 100 for grounding grids. This paper presents an experimental work using scale model for different grounding system configuration such as vertical rods with different shapes and different grounding grids to measure the Earth Surface Potential (ESP) in one and two layer model soil. Based on the similarity theory one can replace the investigations of a phenomena in nature by the investigation of an analogous phenomena in a model of smaller or larger scale under specified Laboratory conditions.
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