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Commonly used terms in the Electrical industry.
direct-axis subtransient reactance
the high-frequency asymptote of the d-axis operational impedance of a synchronous machine. This value characterizes the equivalent reactance of the d axis of the machine during the initial time following a system disturbance. In models in which the rotor windings are represented as lumped parameter circuits, the d-axis subtransient reactance is expressed in closed form as the sum of the stator winding leakage reactance, and the parallel combination of the d-axis magnetizing reactance and the d-axis rotor leakage reactances.
transient reactance
the reactance offered for the transient currents in synchronous machines. Referred to by the symbol X
s
, the transient reactance is a function of the stator frequency and the transient inductance. X
s
is comparatively smaller in comparison to the steady-state inductive reactance of the machine.