3. Give the values of earth resistances for power station, large sub-station, HT line,
LT line and residential installation.
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Answer: The values of earth resistances for power station must be greater than 0.5 ohm. The reason is that the power station requires the high earth current.
The values of earth resistances for large sub-station is 1.0 ohm.
The values of earth resistances for
HT line is 10 ohm.
The values of earth resistances for
LT line is 5 ohm.
And the values of earth resistances for residential installation must be 5 ohm or less than it.
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