Answer Posted / vijaykumarht

CT means current transformer which is used to measure high
currents in terms of very low voltage. And this is converted
into current with the transforming ratio.
As it is connecting to the conductors which carries current,
the main care should be taken is it should be short
circuited until and unless it is connected to some external
meter, or the high voltage will get generated in it as it is
current depenedent and the ct may get damaged it is open
circuited.

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