Slope of the tangent drawn on initial portion of O.C.C of synchronous generator is
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- Initial linear portion of O.C.C. $\rightarrow$ Unsaturated state $\rightarrow$ Yields Unsaturated Synchronous Impedance.
- Actual saturated portion of O.C.C. $\rightarrow$ Saturated state $\rightarrow$ Yields Saturated Synchronous Impedance.