Is the Transformer Short Circuit Calculation Correct?

[fonz]

Ok I've read a lot of articles and seen a lot of different ways of calculating the short circuit current at the transformer terminals.

So I'm going to apply my own intuition and see if I can arrive at the correct value if someone could please confirm my answer.

6.6kV/400V
3 Phase
10MVA
8%Z

By definition %Z is the % of V_p that causes FLC under short circuited conditions.

FLC = 10000000/(1.732*400) = 14434A

so 8% 6600V = 528V

6600/528 = 12.5

So 12.5*11434= 180kA

Is this correct? I know I've simplified it and rounded generously but I'm just trying to get the general principle down.

Thanks
Dan

 

[litup]

http://www.powerqualityanddrives.com/short_circuit_transformer/

This covers the situation rather well I think.