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The short circuit power from a generator can be estimated to Mbase/Zsorce. Hence, a large Mbase and small Xsorce will lead to a very high short circuit power contribution to the bus, i.e. an infinite bus!
For example, Mbase=10 000 MVA, Xsorce=0.01 --> Short circuit power = 10 000/0.01 = 1 000 000 MVA.
