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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...