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Definition of "quadrature-axis subtransient short-circuit time constant" |
a constant that characterizes the initial decay of transients in the q-axis variables of the synchronous machine with the stator windings short-circuited. The interval characterized is that immediately following a disturbance, during which the effects of all amortisseur windings are considered.A detailed (derived) closed-form expression for the subtransient short-circuit time constant of a machine with two q-axis amortisseur windings is obtained by taking the reciprocal of the largest root of the numerator of the q-axis operational impedance. An approximate (standard) value is often used,in which it is assumed one amortisseur winding resistance is small relative to the other and the detailed expression simplified. |
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