designing of earthing

How to Design Earthing system in substation

The substation grounding system comprises of a grid (earth mat) formed by a horizontal buried conductors. Before 1960s the design criterion of substation earthing system was “low earth resistance.” (Earth Resistance< 0.5 ohms for High Voltage installations).  During 1960s, the new criteria for the design and evaluation of Substation Earthing System were evolved particularly for EHV…

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