Typical earth resistance values various substations Earth resistance = Potential to earth electrode/Current Earth resistance= V/I
Reasonable values for earth resistance are:
Power stations-0.5 ohms
Large power stations-0.5 ohms
Major power stations- 1.0 ohms
11 kV (Small) substations-2.0 ohms
33KV substations-2.0 ohms
66 KV substations- 2.0 ohms
132 kV to 400 kV (EHT) substations-1.0 ohms
DTR structures-5 ohms
Tower foot resistance-10 ohms