Patent ID: 8742876
Filing Date: 2014-06-03
Classification: F03D,F05B,F28D,H01F,Y02E

Abstract:
1. A dry transformer coil, comprising: a primary winding; a secondary winding, the primary and second windings having turns; a passively operating heat pipe for carrying thermal energy away from the transformer coil, a section of the heat pipe configured as an evaporator for evaporation of a working medium, arranged in an area of the windings; and a winding axis along which the primary and second windings are arranged, wherein the evaporator forms a plurality of extensive evaporator segments which hold a working medium, extend in a circumferential direction of the windings and along the winding axis and overlap with a plurality of the turns of the secondary winding, the evaporator segments being closed in a bottom area and being in a form of an annular cylindrical vessel, the evaporator segments being surrounded by the secondary winding, or the secondary winding being surrounded by the evaporator segments, wherein the plurality of extensive evaporator segments each have a first end and a second end, connected to one another in an area of their first ends, to form a collecting trough for the working medium and to allow circulation of the working medium through all the evaporator segments.