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

The SCC is almost linear, since under the short-circuit conditions the [[magnetic flux]] in the generator is below the iron [[magnetic saturation|saturation]] levels and thus the [[reluctance]] is almost entirely defined by the fixed one of the [[air gap (electric machine)|air gap]]. The name "synchronous impedance curve" is due to the fact that in the short-circuit condition all the generated voltage dissipates across the generator internal synchronous impedance <math>Z_S</math>.{{sfn | Klempner | Kerszenbaum | 2004 | pp=125-126}}

The curve is obtained by rotating the generator at the rated [[RPM]] with the output terminals shorted and the output current going to 100% of the rated for the device (higher values are typically not tested to avoid overheating).{{sfn | Boldea | 2015 | p=412}}

== References ==
{{Reflist}}

== Sources ==
* {{cite book | last=Klempner | first=G. | last2=Kerszenbaum | first2=I. | title=Operation and Maintenance of Large Turbo-Generators | publisher=Wiley | series=IEEE Press Series on Power Engineering | year=2004 | isbn=978-0-471-61447-0 | chapter-url=https://books.google.com/books?id=DPdkLp_crLAC&pg=PA125 | chapter=Short-Circuit Saturation Characteristic | access-date=2023-07-08 | pages=125–126}}
* {{cite book | last=Boldea | first=I. | title=Synchronous Generators | publisher=CRC Press | year=2015 | isbn=978-1-4987-2355-8 | url=https://books.google.com/books?id=VB-vCgAAQBAJ&pg=PA412 | access-date=2023-07-08}}
{{Characteristics of synchronous machines}}

[[Category:Electrical generators]]


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