High-voltage bushing with layers of preshrunk embossed insulating foils

A high voltage insulator bushing of the type having at least one conductor part at a high voltage with respect to at least a second conductor part at a reference potential, the insulator bushing further having an insulator body disposed between said first and second conductor parts which is formed of at least one wound, smooth insulating foil with electrically conductive potential control inserts disposed within preselected windings of the insulating foil in the insulator body, the insulator body being impregnated with a liquid insulating medium, the insulator bushing further comprising as at least one layer of the insulator body, an embossed insulating foil formed of a polypropylene material which is embossed with between 300 and 700 dimples per square centimeter, said polypropylene material being of the type which shrinks above a predetermined temperature, said embossed insulating foil having a predetermined smooth thickness in an unstretched state prior to embossing, and a predetermined overall embossed thickness after embossing, said embossed foil having been entirely subjected to a thermal shrinking treatment after embossing and prior to being wound into said insulator body so as to have an overall thickness after said thermal shrinking treatment which is at least 20 percent larger than said predetermined smooth thickness.