Short circuit ratio (SCR)
Updated 2026-10-27
Data records
- In IEEE 519-2022 the short circuit ratio at a location is the available short circuit current divided by the maximum demand load current, both in amperes, which makes the ratio dimensionless.
- In IEEE 519-2022 the short circuit ratio at the point of common coupling selects the row of Table 2, Table 3 or Table 4 that applies to a user, with the most restrictive row for the weakest supply and a footnote holding power generation facilities to that row regardless of their ratio.
- The term is written Short circuit ratio (SCR). Value: Short circuit ratio (SCR).
Sources
- Electrical Testing Reference editorial taxonomy, Electrical Testing Reference editorial taxonomy of test methods, 2026-10 edition, Electrical Testing Reference. Held as: Own observation.
- IEEE 519-2022, Harmonic Control in Electric Power Systems, 2022 edition, IEEE. Cited: clause 3.1; clause 5.3. Held as: Purchased single-user copy. Publisher page for IEEE 519-2022Publisher information page
Obtaining the documents
- IEEE 519-2022: available from the publisher
Changelog (3 entries)
| Date | Revision | Change |
|---|---|---|
| 2026-10-27 | created (qty.short-circuit-ratio.ieee519.definition) | |
| 2026-10-27 | created (qty.short-circuit-ratio.ieee519.use) | |
| 2026-10-27 | created (qty.short-circuit-ratio.title) |
Cite this page
Cite the governing standard for the fact itself; cite this page as the finding aid.
"Short circuit ratio (SCR)." Power Quality Reference. 2026-10-27. https://www.powerqualityreference.com/quantities/short-circuit-ratio/.
Power Quality Reference, Short circuit ratio (SCR) (Oct. 27, 2026), https://www.powerqualityreference.com/quantities/short-circuit-ratio/.
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title = {Short circuit ratio (SCR)},
howpublished = {\url{https://www.powerqualityreference.com/quantities/short-circuit-ratio/}},
organization = {Power Quality Reference},
publisher = {Power Quality Reference},
year = {2026},
note = {last substantive change 2026-10-27}
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