Calculation of short-circuit currents in the system HV, including the determination of some minimum number of short-circuiting sets

ATTENTION - instead of a decimal comma should be used decimal DOT !
Input values
Nominal power of transformer Str= MVA
Sekundární napětí transformátoru (sdruľené)Usek=
Short-circuit voltage of transformeruk= %
c=
Reactance of lines Xv= ohm/km