we all know that in transformer, voltage and current are
inversely related i.e. Vp/Vs= Is/Ip....so in standard
CT..we have a ratio of 200/5...that means our voltage
should increase by ratio of 40..althoug that is not the
case...because that requires high insulation level.and
pratically not feasible......can anybody clarify my
ques.......thanx
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Answer Posted / k.prakashchandra
Voltage ratio is not applicable when the secondary of the Tr
is short circuited.Actually the secondary of CT has more
turns than the primary.No voltage is applied to primary of
CT and a small voltage is induced in secondary due to the
mmf created in primary by the current flowing through
it.When this emf of secondary is short circuited , the
current produced is proportional to the current in the
primary.That is why it is called CT and not just Tr.
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