Short Circuit Data: generator
Typical equipment impedances (%Z) and X/R ratios for short circuit calculations per IEEE 141 (Red Book) and IEEE 551 (Violet Book). Covers transformers by kVA, utility sources by voltage level, cables, motor contributions, generators, and reactors.
| equipment type | rating label | notes | xr ratio max (dimensionless) | xr ratio typical (dimensionless) |
|---|---|---|---|---|
| generator | DIESEL_SYNCHRONOUS | Diesel gen; Xd 9-15%; high X/R due to winding construction | 8 | 3 |
| generator | GAS_TURBINE_SYNCHRONOUS | Gas turbine gen; Xd 11-17% | 10 | 3.5 |
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