Terminal vs induced voltage for a transformer with respect to the voltage rating
A '2200/220 V' transformer rating is ambiguous. It might mean that is the transformation ratio at zero load current. It might mean that's the transformation ratio at the rated load current.
The difference between those two ratings is the voltage dropped at load current across the series R and X components, or the difference between En and Vn. In an ideal transformer of course they are the same.
A transformer is usually rated at the full load current, and the voltages specified are the terminal voltages.
Generally we don't get too hung-up about these loss terms, but roll them all up into a 'regulation' figure. If a transformer has 5% regulation, that means that at rated current, the output voltage drops to 95% of its no load value.