short circuit ratio calculation

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louie

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Not familiar with short circuit ratio (X/R) of synchronous generator calculation.

Given generator reactances (Xd, X'd, X''d, ....), time constants, stator/rotor resistance, etc.

How would on compute the short circuit ratio ? (if it is possible with the above info.)

Thanks
 

ron

Senior Member
Re: short circuit ratio calculation

For example, if the per unit subtransient reactance of the gen is .2 (which you find out from the manuf), 1/.2=5, so take the FLA of the GEN and multip by 5, and you get the fault current available.
 
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