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Can CT Secondary left open circuited and why(reason)?
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Answer Posted / muhammad nazim
A CT is basically a step-up transformer(from voltage point
of view).In the case of 400/1 A CT the primary turn is 1
(say the busbar)and the secondary turns is 400.How much
will be the primary voltage drop?? it will be in millivolts
for a busbar.So this millivolts multiplied by 400 will
cause just around a few volts (say 3 to 10V) for an open
secondary.But i have read that the secondary voltage will
reach a few kilovolts for a 400/1A CT at full load
conditions.My question is how it will reach a few kilovolts
and damage the CT on open secondary condition?As we have
seen above the max voltage wil be just in few volts.So
please someone
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