Current transformers
Current transformers
(OP)
Is there any standard (or non standard yet tested) method for reversing the saturation (Desaturation)of the core of a saturated CT ? In this case the CT is 33kv one with the protection core saturated.





RE: Current transformers
A CT left idle for some time gets demagnetised (without doing any thing in particular).
Trace the Hysteresis curve of the CT core starting with its knee point voltage and then repeating the same several times, reducing the peak applied voltage little by little every time. This method id used if CT needs to be demagnetised in a short time and put back in service.
RE: Current transformers
RE: Current transformers
A good CT test unit will do the job automatically. This is a plus, because doing it manually can be challenging. You must hit the knee point without overshooting into the trip your source region.
RE: Current transformers