Explain the operating principle of current transformer with equivalent circuit
Answers
Answer:
DEFINATION:
current transformer is an instrument transformer, used along with measuring or protective devices, in which the secondary current is proportional to the primary current (under normal conditions of operation) and differs from it by an angle that is approximately zero.
FUNCTIONS :
Current transformers perform the following functions:
Current transformers supply the protective relays with currents of magnitude proportional to those of power circuit but sufficiently reduced in magnitude.
The measuring devices cannot be directly connected to the high magnitude supplies. Hence current transformers are used to supply those devices with currents of magnitude proportional to those of power.
A current transformer also isolates the measuring instruments from high voltage circuits.