An electrical transformer comprising a core and one or more winding assemblies mounted to the core, each winding assembly comprising a low voltage winding and a high voltage winding, wherein the high voltage winding comprises a first winding section and a second winding section arranged consecutively in the axial direction of the high voltage winding and connected through an electrical junction, the first and the second winding sections comprising insulated conductors in multilayer arrangements wherein a plurality of conductor layers (9', 9"...), each having one or more turns (16', 16"...) in said axial direction, are wounded on top of one another in the radial direction of the high voltage winding, each of the first and second winding sections having a radially external terminal (11, 13) and a radially internal terminal (12, 14), wherein: - the first winding section radially internal terminal is connected to the second winding section radially external terminal through said electrical junction; - the first winding section radially external terminal is the high voltage winding entrance; - the second winding section radially internal terminal is the high voltage winding exit, wherein the first winding section and the second winding section are arranged so to form an axial gap in said axial direction of the high voltage winding, wherein the first winding section radially internal terminal is axially external with respect to said high voltage winding and the second winding section radially external terminal is axially external with respect to said high voltage winding, axially opposite to said first winding section radially internal terminal, wherein said electrical junction between the first and the second winding sections is located outside said axial gap, wherein the number of layers (9', 9"...) of each of said first and second winding section is even. wherein the high voltage winding comprises a first winding section and a second winding section arranged consecutively in the axial direction of the high voltage winding and connected through an electrical junction, the first and the second winding sections comprising insulated conductors in multilayer arrangements wherein a plurality of conductor layers (9', 9"...), each having one or more turns (16', 16"...) in said axial direction, are wounded on top of one another in the radial direction of the high voltage winding, each of the first and second winding sections having a radially external terminal (11, 13) and a radially internal terminal (12, 14), wherein: - the first winding section radially internal terminal is connected to the second winding section radially external terminal through said electrical junction; - the first winding section radially external terminal is the high voltage winding entrance; - the second winding section radially internal terminal is the high voltage winding exit, - the first winding section radially internal terminal is connected to the second winding section radially external terminal through said electrical junction; - the first winding section radially external terminal is the high voltage winding entrance; - the second winding section radially internal terminal is the high voltage winding exit, wherein the first winding section and the second winding section are arranged so to form an axial gap in said axial direction of the high voltage winding, wherein the first winding section radially internal terminal is axially external with respect to said high voltage winding and the second winding section radially external terminal is axially external with respect to said high voltage winding, axially opposite to said first winding section radially internal terminal, wherein said electrical junction between the first and the second winding sections is located outside said axial gap, wherein the number of layers (9', 9"...) of each of said first and second winding section is even.