Open-circuit saturation curve
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The open-circuit saturation curve (also open-circut characteristic, OCC) of a synchronous generator is a plot of the output voltage as a function of the excitation current or field.[1]
At the low field, the permeable iron in the magnetic circuit of the generator is not saturated, therefore the reluctance almost entirely depends on the fixed contribution of the air gap, so the part of the curve that starts at the point of origin is a linear "air-gap line" (output voltage is proportional to the excitation current). As the iron saturates with higher excitation and thus higher magnetic flux, the reluctance increases, and the OCC deflects down from the air-gap line.[1]
References
- ^ a b Klempner & Kerszenbaum 2004, p. 125.
Sources
- Klempner, G.; Kerszenbaum, I. (2004). "Open-Circuit Saturation Characteristic". Operation and Maintenance of Large Turbo-Generators. IEEE Press Series on Power Engineering. Wiley. ISBN 978-0-471-61447-0. Retrieved 2023-07-08.
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