Abstract: A high-voltage winding for core-form power transformers is disclosed that uses two different conductor configurations within a single coil to minimize eddy current losses. The winding includes a first elongated conductor bundle formed from a plurality of thin enamel coated conductor ribbons arranged in side by side relation. A plurality of second elongated conductor bundles are each formed from at least one bundle section having a multiplicity of elongated insulated conductor strands arranged in side by side relation. Each of the conductor strands is less than 40 mils thick. The coil includes a top end section, a body section and a bottom end section. The body section is spirally wound with the first conductor bundle. The top and bottom end sections are wound with the second conductor bundles. In windings that include tap connectors, the tap section is also wound with one of the second conductor bundles.

Abstract: A high voltage electrical winding for shell form transformers is disclosed that reduces eddy current and circulating current losses within the winding. The winding is fabricated from an elongated conductor bundle that is spirally wound into a plurality of turns. The conductor bundle is formed from a multiplicity of enamel coated elongated conductor strands arranged in side by side relation. Each of the conductor strands has a rectangular cross section with a thickness of less than approximately 40 mils between contacting surfaces. The strand's cross sectional height is preferably less than 120 mils. The conductor strands are mounted side by side such that their respective contact surfaces abut. The conductor bundle is preferably wrapped in an adhesive tape to give the bundle some structural support and to provide insulation between winding turns. The disclosed winding also has very good mechanical strength and impulse distribution.