what is neutral grounding? why is it required? what is
neutral grounding resistor and how is its value calculated??
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Answer Posted / minu
@ Pankaj:
"The reason of solid grounding in LV system is that the
amount of earth fault current is very less e.g. for a
single phase to earth fault in a 415V 3 phase system, the
earth fault current is only 240A (considering earthing
resistance 1 Ohm). Whereas in 11kV system, the amount of
fault current will be 6351A. Hence resistance/impedance is
added to reduce the current to a safe value e.g. a 1250 Ohm
resistance in 11kV system limits the fault current to 5A"
i would like to differ in this point of yours. the LG fault
current in a system is never very less. it usually amounts
almost equal to the phase fault current or even more. I can
say this coz i have conducted short circuit studies for many
industrial plants where the LV system is solidly grounded.
| Is This Answer Correct ? | 11 Yes | 6 No |
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