Short-Circuit & Per-Unit Studies

Study Summary: Fault Results, Switchgear Margin and Recommended Changes

A one-page summary of a 13.8 kV utility, 2.5 MVA transformer, generator and motor system: 20.9 kA at the 13.8 kV bus and 63.1 kA at the 480 V bus, a 3.0% margin on 65 kA gear against 58.5% on 100 kA, 14.2 to 3.8 cal/cm² with ZSI, a 5 A (55.4 Ω) HRG option and five recommended changes.

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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