Calculation of short-circuit currents on the secondary side of power transformer, including the determination of the number of short-circuiting sets

ATTENTION - instead of a decimal comma should be used decimal DOT !
Input values
Nominal power of transformer Str= MVA
Secondary voltage of transformer (line)Usek=
Short-circuit voltage of transformeruk= %
c=
Parameters of short-circuiting set Ith= kA pro t= s