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[[File:Synchronous machine curves.png|thumb|upright=1.5|A diagram with multiple synchronous machine curves; ''open-circuit saturation curve'' is the leftmost one]]
The '''open-circuit saturation curve''' (also open-circuit characteristic, OCC) of a [[synchronous generator]] is a plot of the output [[open circuit voltage]] as a function of the [[excitation current]] or field. The curve is typically plotted alongside the [[synchronous impedance curve]].{{sfn | Klempner | Kerszenbaum | 2004 | p=125}}
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