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# 1.3MW/400V/ short circuit torque calculation...

## 1.3MW/400V/ short circuit torque calculation...

(OP)
I have to calculate the 2 phase SC fault torque & 3 phase SC fault torque so what formula I should use for this calculation. The Xd'' is 0.16 and X2 is 0.2 for the alternator . The rating of the alternator is
1300 kW/3 phase/400V/4Pole /1500 RPM

### RE: 1.3MW/400V/ short circuit torque calculation...

In my opinion, in p.u.: Tmax=1.3*VLL^2/xd" for phase-to-phase short-circuit at generator terminals that means 1.3*1^2/.16=8.125 and Tmax=VLL^2/xd”=6.25 for 3 phase short-circuit.
In order to find this in Nm you have to multiply by Trated=Prated/(2*pi()*rpm/60)
Trated=1300*1000/(2*pi()*1500/60)= 8276.057 Nm

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