Discussion
What should be the value of earth resistance for large power station?
Answer: B
The earth resistance of a large power station should be about 0.5 Ω.
The earthing of a station must carry very large fault currents to ground while keeping the voltage rise of the earthed metalwork, and the step and touch voltages around it, low enough to be safe. The larger the fault level, the lower the earth resistance has to be, so large power stations are designed for about 0.5 Ω or less.
About 1 Ω is the usual figure for major substations, about 2 Ω for smaller substations, and higher values such as 5 Ω are acceptable only for small installations.
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