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High-voltage windings for shell-form power transformers

Image Number 2 for United States Patent #4859978.

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.

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