Patent ID: 9111677
Filing Date: 2015-08-18
Classification: H01F,Y10T

Abstract:
1. A method of manufacturing a dry, open wound power distribution transformer comprising: (a.) providing a ferromagnetic core; (b.) providing a cylindrical insulation barrier having a plurality of circumferentially spaced and radially-extending comb structures, each comb structure comprising a plurality of teeth, wherein the teeth of the comb structures form a series of gap rings arranged along an axial length of the insulation barrier, each of the gap rings comprising a series of circumferentially arranged gaps; (c.) forming a winding over the insulation barrier, the winding comprising a plurality of serially connected discs arranged in an axial direction of the winding, wherein the forming of the winding comprises forming each disc by: d.) applying an insulating varnish to the winding; and e.) mounting the winding to the ferromagnetic core.