Patent ID: 11915856
Assignee: HITACHI ENERGY LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An electromagnetic induction device comprising a magnetic core having a limb and at least one winding wound around the limb, wherein the winding comprises:
an electrical conductor forming a plurality of radially overlapping layers around an axis;
an electrically insulating material positioned between the radially overlapping layers of the electrical conductor;
at least one magnetic material end-fill positioned at at least one axial end of the winding in electrical contact with the layers of the electrical conductor so to be at the same electrical potential with the latter, wherein the magnetic material end-fill comprises at least one magnetic strip wound around said axis so to form a plurality of radially overlapping layers, each layer of the magnetic strip being positioned in correspondence to and in electrical contact with a respective layer of the electrical conductor;
at least one electrically insulating material end-fill positioned at said at least one end of the winding, such that the magnetic material end-fill is axially positioned between the electrically insulating material end-fill and the electrical conductor, wherein the electrically insulating material end-fill comprises a pressboard strip wound around said axis so to form a plurality of radially overlapping layers, wherein each layer of the pressboard strip is radially positioned in correspondence to a respective layer of the at least one magnetic strip and to a respective layer of the electrical conductor, wherein the layers of the at least one magnetic strip are axially positioned between the layers of the electrical conductor and the layers of the pressboard strip.