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Finding 3-phase generator fault current

pave_spectre

Oct 23, 2019
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Oct 23, 2019
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Hello, new guy here.
Currently I am studying EE at university in Aus, and I am struggling with an assignment on Electrical Machines.
I am trying to find the dc component of a generator symmetrical short circuit fault current, but am struggling to come up with a solution.
We are given the generators specifications (MVA , kV, Hz) and the sub transient, transient and steady state reactances as well as the subtransient, and transient time periods. I have solutions for each of the AC fault currents, but all the equations I have found for dc fault current component require a time constant that depends on resistance which has been neglected in this problem.
The lecture notes are just walls of equations, so picking out the useful parts from all the noise is difficult at best.
If anyone can point me in the right direction or suggest what I am missing it would be very much appreciated.
 
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