Quadrature-axis transient short-circuit time constant
Quadrature-axis transient short-circuit time constant a constant that characterizes the decay of transients in the q-axis variables of the synchronous machine with the stator windings short-circuited. The interval characterized is that following the subtransient interval, but prior to steady-state, during which the transients of the fastest dynamic q-axis rotor circuits have subsided. A detailed (derived) closed-form expression for the transient short-circuit time constant of a machine with two q-axis amortisseur windings is obtained by taking the reciprocal of the smallest root of the numerator of the qaxis operational impedance. An approximate (standard) value is often used, in which it is assumed one amortisseur winding resistance is infinite and the detailed expression simplified.
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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