Transformer unit and method for operating a transformer unit

A transformer unit, comprising:

• a primary side including a primary coil wound around a transformer core and a secondary side including a secondary coil wound around the transformer core, wherein during operation, a secondary-side actual voltage is establishable upon application of a primary voltage to the primary coil, the secondary-side actual voltage being affected owing to an additional secondary-side voltage drop caused by secondary-side parasitic effects;
• a first measuring coil, wound around the transformer core, to determine a first measuring voltage;
• a measuring element, arranged and designed on the primary side to determine a second measuring voltage, the second measuring voltage being correlatable with the additional secondary-side voltage drop;
• and
• a controller to control operation of the transformer unit, the controller being designed to
• adjust the primary voltage so as to induce a secondary desired voltage in the secondary coil, and
• adjust the primary voltage as a function of the first measuring voltage and the second measuring voltage, wherein the controller includes an evaluation unit, designed to determine the secondary-side actual voltage based upon the first measuring voltage and the second measuring voltage, and wherein the controller is designed to adjust the primary voltage as a function of the secondary-side actual voltage determined.