Transformer arrangement having a transformer axis, comprising: a primary coil comprising three primary winding layers, each primary winding layer comprising a plurality of primary windings wound around the transformer axis in a respective primary winding layer distance range from the transformer axis, a secondary coil comprising two secondary winding layers, each secondary winding layer comprising at least one secondary winding wound around the transformer axis in a respective secondary winding layer distance range from the transformer axis, wherein the three primary winding layer distance ranges and the two secondary winding layer distance ranges each extend perpendicular to the transformer axis and are not overlapping each other, wherein the three primary winding layers and the two secondary winding layers are arranged to overlap in a length section along the transformer axis, wherein each of the three primary winding layers has a different primary winding layer distance range, and wherein the three different primary winding layer distance ranges each extend perpendicular to the transformer axis and are not overlapping each other and are not overlapping the two secondary winding layer distance ranges, wherein each of the two secondary winding layers has a different secondary winding layer distance range, wherein the two different secondary winding layer distance ranges each extend perpendicular to the transformer axis and are not overlapping each other and are not overlapping the three primary winding layer distance ranges, wherein each of the two secondary winding layers extends substantially over the whole length section along the transformer axis and is surrounded by two primary winding layers, the two secondary winding layers being distinct with one of the primary winding layers in-between, and wherein the secondary coil comprises flow channels for a cooling fluid, the flow channels being integrated in the secondary windings. a primary coil comprising three primary winding layers, each primary winding layer comprising a plurality of primary windings wound around the transformer axis in a respective primary winding layer distance range from the transformer axis, a secondary coil comprising two secondary winding layers, each secondary winding layer comprising at least one secondary winding wound around the transformer axis in a respective secondary winding layer distance range from the transformer axis, wherein the three primary winding layer distance ranges and the two secondary winding layer distance ranges each extend perpendicular to the transformer axis and are not overlapping each other, wherein the three primary winding layers and the two secondary winding layers are arranged to overlap in a length section along the transformer axis, wherein each of the three primary winding layers has a different primary winding layer distance range, and wherein the three different primary winding layer distance ranges each extend perpendicular to the transformer axis and are not overlapping each other and are not overlapping the two secondary winding layer distance ranges, wherein each of the two secondary winding layers has a different secondary winding layer distance range, wherein the two different secondary winding layer distance ranges each extend perpendicular to the transformer axis and are not overlapping each other and are not overlapping the three primary winding layer distance ranges, wherein each of the two secondary winding layers extends substantially over the whole length section along the transformer axis and is surrounded by two primary winding layers, the two secondary winding layers being distinct with one of the primary winding layers in-between, and wherein the secondary coil comprises flow channels for a cooling fluid, the flow channels being integrated in the secondary windings.