Shielded winding with cooling ducts

Claim 1

Electrical inductive apparatus comprising: a tank, fluid cooling means disposed in said tank, an electrical winding disposed in said tank and immersed in said fluid cooling means, said electrical winding including a plurality of axially spaced pancake-type coils each having a plurality of conductor turns which define first and second major opposed surfaces, an opening which extends between its major surfaces, and inner and outer edges, means electrically interconnecting adjacent pancake coils, providing interpancake connections which alternately connect the pancake coils with start-start and finish-finish connections and provide at least one series circuit through the electrical winding, a plurality of insulated edge shielding assemblies, each disposed to shield one of the interpancake connections and the adjacent edges of the two pancake coils interconnected thereby, each of said plurality of insulated edge sHielding assemblies including first and second shielding members, each of which have an insulating core member and electrically conductive means disposed about said core member, first spacer means disposed between said first and second shielding members, and insulating means disposed about said first and second shielding members and said first spacer means, to provide a unitary edge shielding assembly, and second spacer means disposed between the inner and outer edges of said pancake coils and their associated edge shielding assemblies, enabling said fluid cooling means to come into contact with the inner and outer edges of said pancake coils.