How is the nominal current of a transformer calculated?
The nominal current rating for the transformer is calculated as follows:
Inom(HV) = Snom / SQRT3 / Unom(HV) * ratfac
Inom(LV) = Snom / SQRT3 / Unom(LV) * ratfac
Unom(HV) = rated HV voltage of the transformer
Unom(LV) = rated LV voltage of the transformer
ratfac = Rating Factor