Short-Circuit & Per-Unit Studies

Motor Contribution to Fault Current on a 480 V Bus

A 1500 kVA transformer feeding a 480 V plant bus where three running 400 hp motors add fault current. The transformer supplies 31.38 kA and each motor 1.984 kA, for 37.33 kA total, with the fault current paths and notes on decay.

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Line-to-Line Fault at Transformer Secondary Terminals (thumbnail)

Line-to-Line Fault at Transformer Secondary Terminals

Bolted Three-Phase Fault at a 1000 kVA Transformer: 20.1 kA (thumbnail)

Bolted Three-Phase Fault at a 1000 kVA Transformer: 20.1 kA

Impedance Chain from Utility Source to a 13.8 kV Fault (thumbnail)

Impedance Chain from Utility Source to a 13.8 kV Fault