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Commonly used terms in the Electrical industry.
direct axis synchronous reactance
the sum of the stator winding leakage reactance and the direct-axis magnetizing (armature) reactance of a synchronous machine. This represents the balanced steady-state value of the direct-axis operational impedance of the synchronous machine, and thus characterizes the equivalent reactance of the machine during steady-state operation.
synchronous reactance
the inductive reactance of the armature windings in synchronous machines under steady-state conditions. Designated by the symbol X
s
,expressed in ohms per phase, the synchronous reactance is a function of the stator inductance and the frequency of the stator currents.