A high voltage-high current transformer bushing having a cast resin insulating housing and hollow central conductor containing fluid coolant

Claim 1

A high-current bushing comprising an elongated hollow metallic current carrying member having four sidewalls and first and second ends, resin insulating material cast around said current carrying member, said resin insulating material terminating short of said first and second ends of said current carrying member, shield means cast in said resin insulating material in spaced relationship to said current carrying member, terminal means connected to said shield means, said cast resin insulating material comprising a flange for mounting said bushing, a pair of substantially transverse wall members welded inside said hollow current carrying member with a fluid tight joint, said transverse wall members being spaced from each other with a substantially transverse wall member adjacent each of said first and second ends of said current carrying member, said pair of substantially transverse wall members providing a liquid tight chamber between said transverse wall members for retaining coolant inside said elongated hollow metallic current carrying member, and terminal means located on the sidewalls of the respective ends of said current carrying member which extend beyond said resin insulating material adjacent the ends of said current carrying member for connecting electrical conductors to the sidewalls of said current carrying member.