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Synchronous reactance

Synchronous reactance

Synchronous reactance

(OP)
Could somebody explain what is the meaning of the Synchronous Reactance, and the Sub Transient Reactance of a Generating Set.

RE: Synchronous reactance

During a short-circuit current and the reactance of the machine is a time-varying function such as

         I(t)= (Em/Z).[Sin(wt+a-Q)-Sin(a-Q).e-RT/L]
         Z= SQRT[(R2+W2L2)]


To facilitate the analysis, the reactance is approximated in a stepwise fashion in three time zones denoted the substarnsient (2<cycles<5), transient (<5 cycles<30) and steady state (>30 cycles).

There are standard procedures for factory test of those parameters. For constant voltage the value of those parameters are as follows:
   
1- Subtransient:          X’’d = E/I”

2- Transient                X’d = E/I’

3- Steady-State             Xd =  E/I

See the enclose site to illustrate this concept.

http://xnet.rrc.mb.ca/janaj/1_3_1_transient_circuit_model.htm




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