Direct-axis transient short-circuit time constant

Direct-axis transient short-circuit time constant

 

 

Direct-axis transient short-circuit time constant

 

Meaning of Direct-axis transient short-circuit time constant

Direct-axis transient short-circuit time constant a constant that characterizes the decay of transients in the d-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, in which the effects of the amortisseur windings are small (possibly negligible). A detailed (derived) closed-form expression for the short-circuit transient time constant is obtained by taking the reciprocal of the smallest root of the numerator of the d-axis operational impedance. An approximate (standard) value is often used, in which it is assumed the amortisseur winding resistance is infinite and the detailed expression simplified.

 

Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf

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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000

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Direct-axis transient short-circuit time constant

 

Direct-axis transient short-circuit time constant

 

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Direct-axis transient short-circuit time constant

 

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Direct-axis transient short-circuit time constant