Current transformers are designed to provide a scaled down replica of the current in the HV line and isolate the measuring instruments, meters, relays, etc., from the high voltage power circuit. Some of their characteristics:
- Current input to different types of protection relays.
- Ideal for installation at metering points due to its very high accuracy.
- Excellent frequency response; applicable for monitoring power quality and measuring harmonics.
- Suitable for installation in AC filters in converter substations for HVDC projects