{
  "$schema": "https://ps-wiki.github.io/schema/v1/term.schema.json",
  "id": "short-circuit-ratio",
  "title": "Short-Circuit Ratio",
  "description": "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.",
  "language": "en",
  "tags": [
    "stability",
    "nerc"
  ],
  "related": [
    "grid-strength",
    "stability",
    "weighted-short-circuit-ratio",
    "composite-short-circuit-ratio",
    "short-circuit-ratio-with-interaction-factors",
    "generalized-short-circuit-ratio"
  ],
  "breaking": false,
  "dates": {
    "created": "2025-11-29",
    "last_modified": "2025-11-29"
  },
  "authors": [
    {
      "name": "Jinning Wang",
      "url": "https://jinningwang.github.io"
    }
  ],
  "content": {
    "sections": [
      {
        "order": 1,
        "id": "definition-by-nerc",
        "title": "Definition by NERC",
        "type": "definition",
        "source_keys": [
          "nerc2017integrating"
        ],
        "page": "p1",
        "body_md": "> 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.\n>\n> $SCR_{POI} = \\frac{SCMVA_{POI}}{MW_{VER}}$\n>\n> 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.\n"
      }
    ]
  }
}