Transformer for an electric vehicle

The transformer has a traction secondary winding (2) that is arranged in an inner layer (6) concentrically around a core limb (4). A high-tension primary winding (1) and an auxiliary operation secondary winding (3) are arranged in an outer layer (7) concentrically around core limb and traction secondary winding. The auxiliary operation secondary winding is composed of two electrically connected coils (3.1,3.2) which enclose the high-tension primary winding in axial direction (A).