
Short circuit ratio or SCR is the measure of the generator stability characteristics. 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. ...
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http://en.wikipedia.org/wiki/Short_circuit_ratio

the ratio of the field current for rated armature voltage on open-circuit to the field current for rated armature current on sustained symmetrical short-circuit, both with the machine running at rated speed
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=411-50-21
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