Answer / prasad asolkar

if we have both metering and protection ct at same place and if they are applicable for a single application then the thicker sized ct is protection ct and the thinner sized ct is metering ct.
for eg.
rated current of dg is 1000A
then, metering ct will be 1000/5A & protection ct will be 500/5A.
so for smaller rated ct requires more no of turns at primary therefore the 500/5A ct have thicker winding & 1000/5A ct will have thinner winding.

Answer / gaurang harkhani

when name plate detail not given in CT the only thing that the first core is always metering ,second core is protection,Third core is differential.This is fore my knowledge of testing.

Answer / kmani190

i thing we we cna find from saturation testing but i dont
know correctly.pls clear it.

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