Current Transformers a. A current transformer is a step down instrument for measuring the high value current in L.T /H.T/ E.H.T lines b. It has one or two windings or a bus bar or a heavy line conductor surmounted by a core having large number of thin wires. c. In a C.T the number of turns is inversely proportional to the current and it is connected in series in the line d. C.T is used for metering, recording and relay circuits for different requirements. e .C.T must have its secondary always closed through relays/short circuited and no fuse should be used. However the fuses can be used in shunt circuits while in service. f. Never open a secondary circuit of a C.T which may have high potential due to high impedance and endanger to personnel operating. g. Polarity is important in connecting a C.T in the circuit h. In calibrating a C.T’s impedance burden the configuration of different coil connection in series or in parallel is to be kept in mind. For safety purposes one of the secondary...
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