Thanks Flyer PE!!! I get the PU Method now. In my error above they simplified the problem by directly giving us the SC of the system as 40MVA . Therefore the TX SC is (25MVA) and the system SC is (40MVA). It all works out now.
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I am attempting to solve this problem by the MVA method where...
SC TX= 1MVA/4%= 25MVA
SC Sys= 40MVA/4%= 1000MVA
SC Tot= (In Parallel) so answer is about 24.4MVA
Ssc= 24.4MVA/ (sqrt3*480)= 29,348A. ?????
NCEES Answer 18,500.
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