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I think you should calculate the short circuit current as a phase-to-ground fault. Only one of the phases of the assumed YY transformer is faulted.If a three-phase program is used, it may be simplest to think the single-phase transformer as one-third of a three-phase YY transformer, and to calculate the short circuit current for a three-phase fault.
Both would give the same answer if the 115 kV source impedance and 24.9 kV line impedances are negligible.Calculation of either three-phase or phase-ground fault is possible. Both give the same answer.
Yes. 1Ø fault current could be more or less than 3Ø, but there's no need to complicate things.Should it also be at least 50KA?