I was called out to investigate a b-phase cap bank trip,It is one of the original caps on our system that has just always been an issue. It is an externally fused, grounded cap with two SEL 487V's using bus and mid-cap potential for voltage differential. I am being told the mid-cap ccvts have...
http://technotes1.blogspot.com/2015/10/phase-rotation-on-delta-delta.html?m=1
I'm a substation maitanence engineer and I just can't wrap my head around it. I personally was always taught you have to put phase rotation (ABC or ACB) as one of the highest priorities. He depicts that if you wire...
Hello,
We had a 69/13.2 delta wye bank fail a few months back and were able to find a new one sitting around somewhere. The issue I am running into is metering. The transformer doesn't have 3 low side CT's nor does it have 3 phase pots on the high side. The design has us using the high side...
A little too eager to wait until Monday when the protection engineers get back to work so I figured I would see what this forum knows about an issue we had on Friday with a 230/60kV transformer. It is brand new, has been in service for over two weeks through high and low load. Friday the...
