SCR. The ratio between short circuit apparent power from a 3LG fault at a given location in the power system to the rating of the location.
Last Updated: November 29, 2025
Version: 1.0.0
Generated: December 04, 2025
Source:
SCR is defined as the ratio between short circuit apparent power (SCMVA) from a 3LG fault at a given location in the power system to the rating of the inverter-based resource connected to that location. Since the numerator of the SCR metric is dependent on the specific measurement location, this location is usually stated along with the SCR number.
$ SCR_{POI} = \frac{SCMVA_{POI}}{MW_{VER}} $
Where $SCMVA_{POI}$ is the short circuit MVA level at the POI without the current contribution of the inverter-based resource, and $MW_{VER}$ is the nominal power rating of the inverter-based resource being connected at the POI.