Hi 111R,
That picture is really helpful. Are you able To add the secondary resistances causing the volt drop?
I have drawn it out but I’m still missing something. I’m so close to the “ah-ha” moment.
Hi there,
I have a 132/33kV Dyn Transformer (transformer neutral earthed via NER) supplying an Ungrounded Single Wye 8MVAr Cap Bank with a neutral VT (and various other feeders). The Ungrounded Cap Bank has a neutral VT for neutral overvoltage (59N) protection.
I was hoping someone could help...
Yes, I agree. However won’t the exact same summated fault current flow through this CT ‘branch’ for an external fault whether this particular CT is saturated or not, and therefore have a voltage induced across it? I can’t see the difference between these two cases..
I feel I am close to the...
Hi there,
I feel that I have a good grasp of the high impedance bus zone concept, however I am battling to understand one part of this.
Why do we assume the worst case is for an external fault where the CT closest to the fault saturates?
I understand why this CT saturates, as it will see the...
