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Short-Circuit & Per-Unit Studies

Fault Current at a 480 V Bus: Utility, Generator and Motor Contributions

A 13.8 kV, 500 MVA utility feeding a 2.5 MVA transformer to a 480 V bus with a 1.5 MVA generator and a 600 hp motor group. The utility supplies 48.1 kA, the generator 12.0 kA and motors 3.0 kA, for 63.1 kA total.

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