Do fuses have 75% or 80% ratings? For E-rated fuses,a rule of thumb for fuse sizing can be 1.25% to 1.33% of rated primary full load amps of the transformer or can be as high as 600% based on secondary protection of the transformer. So if 100E fuses are used and it sees a spike of 75A off and...
I need help in deteriming what causes the primary fuses of a 2500KVA, 13.8KV (Delta)- 4160/2400V Wye transformer to open during motor start-up.
The transformer primary fuses are 125A and the motor is 2000HP, 4160V, 242FLA. A reduce motor start is used as a starting method. It is set for 350%...
