I can't argue with any of the above, so I'll make a subtly different point. Yes, you can provide basic overcurrent protection with fuses, although you might struggle to discriminate with protection further downstream, but for something this valuable (and with long lead times to get a replacement), I suggest that you need something more.
a) you should fit earth fault protection
b) as others have mentioned in passing, if you're waiting for a fault to develop to the point where it'll melt a fuse, you've waited too long. therefore, you definitely want a Buchholz trip. for anything more than the commodity sub-MVA DTC transformers, it's generally worth fitting biased differential protection, which doesn't cost much in the scheme
All this leads me to having a proper CB with DC relays
I can't argue with any of the above, so I'll make a subtly different point. Yes, you can provide basic overcurrent protection with fuses, although you might struggle to discriminate with protection further downstream, but for something this valuable (and with long lead times to get a replacement), I suggest that you need something more.
a) you should fit earth fault protection
b) as others have mentioned in passing, if you're waiting for a fault to develop to the point where it'll melt a fuse, you've waited too long. therefore, you definitely want a Buchholz trip. for anything more than the commodity sub-MVA DTC transformers, it's generally worth fitting biased differential protection, which doesn't cost much in the scheme
All this leads me to having a proper CB with DC relays
