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Definition of "quadrature axis subtransient open circuit time constant" |
a constant that characterizes the initial decay of transients in the qaxis variables of the synchronous machine with the stator windings open-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 open-circuit time constant of a machine with two q-axis amortisseur amortisseur windings is obtained by taking the reciprocal of the smallest root of the denominator of the q-axis operational impedance. An approximate (standard) value is often used, in which it is assumed one amortisseur winding resistance is very small relative to the other and the detailed expression simplified. Expressions for the q-axis subtransient opencircuit time constant of a machine with two q-axis amortisseur windings are derived in. |
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