What is the Synchronizing power of a synchronous machine?

A. Directly proportional to the synchronous reactance

B. Equal to the synchronous reactance

C. Inversely proportional to the synchronous reactance

D. None of these

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Synchronizing power is defined as the varying of the synchronous power P on varying in the load angle δ
It is also called stiffness of coupling, stability or rigidity factor; It is represented as Psyn
Synchronising power of synchronous machines is inversely proportional to the synchronous reactance
A synchronous machine, when synchronised to infinite busbars has an inherent tendency to remain in synchronism
At perfect synchronization, their synchronizing power is zero