I have no experience with fuses (other than some fuses on radial distribution lines); I need some help coming up with the fuse size to protect a 3.75/4.68 MVA distribution Transformer. The fuses obviously are on high side (Delta 23kV) and the low side is Wye-grounded 4.16kV. I have looked into using 125E, 150E, and 175E S&C fuses, but don't know what the actual criteria is for coming up with the fuse size based on Transformer data. Transformer Z=6%
Since there is no other form of protection (breakers, relays, etc) on this transformer, I am a little more concerned. Your help would be really appreciated.
Since there is no other form of protection (breakers, relays, etc) on this transformer, I am a little more concerned. Your help would be really appreciated.