High-voltage winding for core-form power transformers

A winding for a core-form induction transformer comprising:

• a body section formed of a first elongated conductor bundle formed from a plurality of insulated body conductor ribbons arranged in side by side relation, wherein the first conductor bundle is spirally wound in a multiplicity of turns to form body section of the winding;
• an end section formed of a second elongated conductor bundle having at least one bundle section formed from a multiplicity of elongated insulated end conductor strands arranged in side by side relation, each said end conductor strand having a substantially rectangular cross section with a pair of substantially parallel contact surfaces and a minor axis, said minor axis joining said contact surfaces, the thickness of each end conductor strand along said minor axis being less than approximately 40 mils, said end conductor strands being mounted side by side such that their respective contact surfaces abut, wherein the second conductor bundle is spirally wound in a multiplicity of turns to form a second portion of the coil.

A winding for a core-form induction transformer comprising:

• a first elongated conductor bundle portion formed from a plurality of enamel coated conductor ribbon arranged in side by side relation, and a plurality of second conductor bundle portions each having a pair of bundle sections formed from a multiplicity of enamel coated elongated conductor strands arranged in side by side relation, each said conductor strand having a substantially rectangular cross section with a pair of substantially parallel contact surfaces and a minor axis, said minor axis joining said contact surfaces, the thickness of each conductor strand along said minor axis being less than approximately 40 mils, said conductor strands being mounted in side by side relation such that their respective contact surfaces abut,
• wherein said first and second conductor bundle portions are spirally wound in a multiplicity of turns to form a coil winding, said coil winding including a top end section, a body section and a bottom end section, wherein said body section is wound with said first bundle portion and said top and bottom end sections are wound with said second bundle portion.