Short circuit ratio

Short circuit ratio or SCR is a measure of the stability of an electromechanical generator.[1] It is the ratio of field current required to produce rated armature voltage at open circuit to the field current required to produce the rated armature current at short circuit.[1][2]

The SCR can be calculated for each point on a grid. Where the SCR is above 1, a grid has good grid strength and will be less subject to variations in frequency and can provide more short circuit current.

See also

References
  1. Lawrence F. Drbal; Patricia G. Boston; Kayla L. Westra; Black & Veatch. Power Plant Engineering (1996 ed.). Springer. p. 241.
  2. A.K.Sawney (2011). A Course in Electrical Machine Design (6th ed.). Dhanpat Rai and co. p. 11.18.
  3. https://books.google.co.uk/books?id=1cW-DwAAQBAJ&lpg=PA5&dq=%22grid%20strength%22&pg=PA5#v=onepage HVDC for Grid Services in Electric Power Systems
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