How to calculate earth flat size for 250 Kva DG and
transformer?
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Answer Posted / samson
Neutral will come in to picture whenever u start ur DG (
and not paralleing with a Grid as it will create a
circulating current), so worst thing that can happen is L.G
fault on a phase of generator or inside the winding , so
max current that can go is dg rating/ phase volatge ( use
formula above) so ur neutral should be capable of that
much curent ,( neglecting any contact resistance in ideal
case)
the switching of neutral is done through contactor.
use this to size strip
the I = K* A/ sqrt of time ( some of IS standered give u k
for bare conductor) Dg manufacturer will size support for
S.C forces
get k for alumi. or copper u can size to next standered
sizes available 20 x 6, 40 x5 n all
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