Answer Posted / kadiresan.k

Generally CT is used to measure higher currents, We need
both Metering and Protection CTs seperately with different
class of accuracy. The purpose of metering CT is to read
the actual current, so it has less class of accuracy.
Whereas in case of protection CT, The measured value of
current is used to protect the equipment by identifying the
abnormalities at the initial stage itself, (provided the
protection relay is tuned perfectly)and protects the
equipment(motors/transformers/transmission and distribution
systems)So it needs high accuracy than metering CTs.

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