Transformer with windings completely embedded in cast resin

Transformer, comprising an iron core, high voltage and low voltage windings, at least one cast resin body completely embedding, holding and insulating said windings, said cast resin body having cooling channels formed therein and having additional channels formed therein being separated from said cooling channels, and insulating gas filling said additional channels, said core having a leg, said low voltage winding having an outer mantle and end faces, said high voltage winding having connecting conductors, said high voltage winding having at least a portion of said cooling channels formed in the interior thereof and being surrounded by at least a portion of said additional gas-filled channels, said low voltage winding being disposed radially between said high voltage winding and said core leg and being surrounded by said additional gas-filled channels at said mantle and end faces thereof, said cast resin body having said cooling channels formed therein being a common body for said iron core and said low voltage winding, and said connecting conductors of said high voltage winding being mainly insulated by said insulating gas.