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What is the difference between CT for protection and Ct for
metering?
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Answer Posted / john bosco
METERING CT:
these types CT are construction wise Different from
Protection CTs. Generally the Core material used will be
different and Core area will be very less compared to
protection Cts. since the application/Requirement of
metering CT is to provide Accurate current for measuremet
at normal loading condition also should saturate for
fault/abnormal condition to prevent Meters connected to
metering CTs from damages resulting from high secondary
currents on fault condition. because meters cannot
withstand for such amount secondary current.
Protection CT:
CT used for protection relays are required to provide
accurate secondary current to relay measurement for
satisfactory operation on faults.
so these CTs should not saturate on fault conditions.
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