CT Sautration & Pickup
CT Sautration & Pickup
(OP)
Hi,
I have an application where the prospective fault level is 10kA. The CT ration is 200/1 5P20. So the max current before CT saturates and larger inaccuracies start is around 4kA.
My settings are such that the pickup will occur at 2kA.
Will this CT pose a problem with the high fault level and saturation?
Or is this not an issue because the pickup is below the saturation level?
Regards
UkGrad
I have an application where the prospective fault level is 10kA. The CT ration is 200/1 5P20. So the max current before CT saturates and larger inaccuracies start is around 4kA.
My settings are such that the pickup will occur at 2kA.
Will this CT pose a problem with the high fault level and saturation?
Or is this not an issue because the pickup is below the saturation level?
Regards
UkGrad






RE: CT Sautration & Pickup
This could cause an issue if say, you have a breaker with C800 CTs and a breaker with C400 CTs and each of these breakers are associated with line and bus protection. If there was a line fault, the C400 CTs could saturate before the C800 cts. The result would be differing secondary currents going to the bus relaying which could cause a false Bus differential trip.