Short-Circuit & Per-Unit Studies

Per-Unit Fault Calculation at a 4.16 kV Bus: 14.61 kA

A 500 MVA utility source (0.02 pu) and a 10 MVA, 7.5% transformer on a 10 MVA base give a total of j0.095 pu, a 1,388 A base current and a 14.61 kA three-phase bolted fault at the 4.16 kV bus, shown with the equivalent circuit.

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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