I've encountered a bus Ct application that I need some help wrapping my head around. Two breakers with 2000:5 contributions to PVD's. Hi side transformer ct's DO Not contribute directly, are 1200:5 and are wired in parallel to the 1200:5 taps on the BKR ct's.
I see this is necessary to accommodate the mis-match of ratios and I see what appears to be an auto transformer affect making this work but I need to be in tune to what all is working together here before I remove one Bkr from service completely while maintaining my bus protection. I'm lacking sufficient Ct engineering theory to reconcile this. Any advise shall be greatly appreciated and thanks in advance.