Short-Circuit & Per-Unit Studies

Equipment Nameplates: Interrupting Ratings Compared with Available Fault Current

Nameplates for five 34.5 kV class circuit breakers (utility, generator, two feeders and station service) with a table comparing interrupting and short-time ratings to available fault current and showing the margin for each, with the design intent.

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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