![]() It ensures the safety of personnel inside or in the immediate vicinity of the station. An efficient earthing system ensures safe and reliable operation of substations. Substations form an integral part of electric power distribution systems. KeywordsSoil Electrical Resistivity Substation Earth Grid Touch Potential Step Potential CYMGRD Ground Potential Rise. This paper also throws light into methods to improve the earthing system when the soil resistivity is high. The conductor spacing and the ground rod quantity is arrived based on various simulations. The measured soil values are then analyzed using the Soil Analysis module of CYMGRD software. ![]() ![]() Soil resistivity measurement is done using Wenner 4 point method. The soil conditions considered are desert conditions and hence with poor resistivity. A 33/11kV indoor GIS substation with a 33kV fault level of 40kA is considered. Substation Design Department National Contracting Company Emirates Ltd.ĪbstractThispaper describes the design ofan earthing system for aGas Insulated Switchgear (GIS) substation using CYMGRD software.The buried earth grid design is based on the soil resistivity of the substation site and the design is verified through simulationsto make sure that the attainable potentials are within the permissible limits ensuring safety of personnel as well as equipments.The design confirms to the IEEE standard80-2000. Design of Earth Grid for a 33/11kV GIS Substation at a High Soil Resistivity Site using CYMGRD Software
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