How can you recognize a CT for measurement and a CT for protection ? What’s the difference ?
-the one for measurement (i don’t know the correct Englisch terms) can go into saturation so that you don’t destroy the measerement device. In Europe they are class 2 or 3.
-the others for protectection can NOT go into saturation, otherwise your protection device would not trip in time or not at all. In Europe they have a higher class: 5.
Least but not last, you have to whatch out for the power VA that it can give. The longer the distance between CT and device, the higher the VA’s must be.