Differential relay CT grounding
Differential relay CT grounding
(OP)
Does anyone periodically check, via meggering, the insulation integrity of the ct secondary of a differential relay scheme. That is, carefully lift the one grounded point of the ct secondary and megger to ground the secondary wiring to ensure there is no insulation damage that could potentially result in a separate ground path and possible false relay operation.
If so, how often?
If so, how often?






RE: Differential relay CT grounding
RE: Differential relay CT grounding
Thanks NORMGA,
I know it's the right thing to do. I also found that the BUREAU OF RECLAMATION test the insulation integrity of thier CT secondarys once every three years.
I will be adding this additional testing to be performed following calibration of our differential relays.
RAH