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Enter a generator with MBASE=19000, XSORCE=1 and Zero-X=0.8. The other short circuit reactances shall remain their default value, 1 pu. This generator will supply 19000 MVA short circuit power.

The bus base voltage must be 322.6 kV in order to get a three phase fault current of 34 kA. 322.6kV * 34kA * 1.73 = 19000 MVA!