4 ms·
It would not be unusual for the protection design to have the LV and HV breakers on either side of the transformer linked, so that if one trips the other does t
by caf 2y ago
It would not be unusual for the protection design to have the LV and HV breakers on either side of the transformer linked, so that if one trips the other does too. So you can't necessarily read anything in to the fact that both tripped.
- londons_explore 2y agoWhy link them? Any failure opening one or other breaker is sufficient to stop fault current. The only reason to even have both breakers is so the transformer can be taken out for maintenance.
- caf 2y agoThe idea is to fully disconnect the faulted element from the power system. In particular with transformers, you don't want it backfed from the low voltage side if the high voltage side is isolated.
- raverbashing 2y agoInteresting, makes sense. And yes I think the backfeeding is the problem, you don't want the other generator to start automatically while the other side is still connected
- jcalvinowens 2y agoI don't know anything about marine regulations, but on land you generally only have a breaker or fuse on one side of a transformer (usually the "powered" side). If you're in US, the mains transformer feeding your residential service almost certainly has no overcurrent protection on the secondary, it has a fuse on the primary.