Answer / rajkumar

current tr, (voltage tr---1 phase, 3 phase---LT, HT)and power tr
current tr--- used mainly to measure current flowing in a
conductor(current flowing conductor is primary and you will
get mA in secondary coil which you can use for measurement)
voltage Tr----to boost or reduce voltage ..ie if you apply
low voltage in primary winding you can get high voltage at
secondary winding and vice versa according to winding
designs. core and shell are designed to minimise tranform
losses.
power Tr---tranforms both current and voltage ..winding with
electronics to boost or reduce power

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