Short-Circuit & Per-Unit Studies

Fault Current Contributions at a 34.5 kV Bus: Utility, Generators and Battery

A one-line with fault current written at each point: 18.7 kA from the utility, four gas turbine generators at about 6 kA each and 7.1 kA from battery storage, for 50.0 kA total on the main bus, with the feeder values and breaker interrupting ratings.

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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