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Short circuit ratio or SCR is a measure of the stability of an electromechanical generator. 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.
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.
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