The low tension current transformer is used mainly for the conversion of the primary current on its secondary side & thus extend the range of instruments/protective devices connected in its secondary circuit. A C.T. by its very nature of application, isolates the devices connected in its secondary circuit from the network system into which the C.T. is connected.
- To reduce line current to a value which is suitable for measuring instruments, relays etc
- To isolate the measuring instruments, meters, relays etc. from line voltage of an installation
- To protect measuring instruments against short circuit currents
- To sense abnormalities in current and give current signals to protective relays to isolate the defective system