Patent ID: 7830233

Claim:
An electrical induction device for high voltage applications, comprising: a magnetic core having at least one leg and operatively coupled to a supporting structure; at least one inner winding which is arranged around said leg and has a first rated voltage; at least one outer winding which is arranged around said at least one inner winding and has a second rated voltage; and electrically insulating means; wherein said at least one inner winding comprises a plurality of substantially concentric turns formed by a sheet of electrically conducting material which is spirally wound, and wherein said electrically insulating means comprise at least one layer of electrically insulating material which is arranged between mutually facing surfaces of said concentric turns, and first shaped insulating means which covers, at least partially, at least one of the upper and lower external rims, and external wall, of said at least one inner winding wherein said first shaped insulating means comprise a first shaped body and a second shaped body having an L-shaped cross section, said first and second shaped bodies being connected to said upper and lower external rims, respectively, with a first side which is positioned substantially parallel to said leg and covers a portion of the outer surface of the last external turn, and a second side which is positioned substantially perpendicular to said leg and covers the corresponding short side of at least said last external turn; and wherein said at least one inner winding comprises a plurality of through channels each extending substantially parallel to said leg between two adjacent turns, the second side of said first and second shaped bodies having a length which is shorter than the distance between the outer surface of said last turn and the external wall of the most external through channel.