To all,
At the moment we are using a 5P20 / 500 / 1 A current transformer. Now we are calculating a primary current of 527.1A. The question is: Can we still use the 5P20 / 500 / 1 A CT or should we go for the 5P20 /
600 / 1 A CT because of continuous overcurrent.When 5P20 / 500 / 1 A can still be used but not continuously what would be the maximum alowable operation time for this CT.
Data: voltage level =34.5kV I= 527.1A continuous. frequency = 60Hz
Does someone know were we can also find the solution according IEC, because in IEC 60044-1 it is not clear stated how to handle continuous primary overcurrents vs CT rated current.
Any advise is welcome.