Thanks for all the help chaps, it would appear i have made a mistake in that the transformer is not 3-phase but is connected phase to phase, so is 400V but the 1.73 is not needed in the calc.
JGhrist seems to be on track i think with the fact that i will need to integrate the area below the...
The primary voltage is 400V 3 phase
the 5x full load current refers to the manufacturers rating of a maximum inrush current of 5 x the full load capable of the transformer.
full load is approximately 320A therefore 5 x is 1600A.
you then square this number and multiply by 0.1 secs.
my...
Hi
new to this forum, but it looks very helpful.
my question is this: I am trying to select an REC Cut-out fuse (BS88) that will not rupture whilst powering up a 125kVA transformer. The inrush rating given by the manufacturer is 5 times full load current. i understand that whilst looking...