### Transformer cheat sheet - ABB US

2013-12-23 · Maximum AIC at the secondary terminals of a transformer can be derived as follows: (Transformer nominal full load current/%Z) X 100 X 1.075 = Short circuit current. with infinite short circuit kVA available on primary. Example: nominal current 2500kVA at 480V is 3,011 amps, nominal Z% is 5.75

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