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What is the difference between CT for protection and Ct for
metering?
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Answer Posted / a.k.tiwari
metering cts are used for the urpose of measuring the current and thus recording the consumption when secondary is connected to the metering terminals.
protection cts are used for protection against over current or faulty current, their secondary is thus connected to the protection relays and the to the tripping coil. there may be series or shunt trip mechanism, thus the burden(VA) of protection ct is more as compared to metering cts.
however the accuracy class of measuring ct is of more significance as they are used for measurment.
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