Short-Circuit & Per-Unit Studies

Line-to-Line Fault at Transformer Secondary Terminals

A 60 MVA, 7.0% impedance delta-wye transformer with a bolted fault between phases B and C on the secondary, with the sequence-network equivalent, the fault current relationship (√3 times the positive-sequence current) and secondary phase voltages before the fault.

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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

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Motor Contribution to Fault Current on a 480 V Bus (thumbnail)

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