H - Electricity – 01 – F
Patent
H - Electricity
01
F
26/119, 117/113.
H01F 41/12 (2006.01)
Patent
CA 1038706
A METHOD OF MAKING ELECTRICAL COILS HAVING IMPROVED STRENGTH AND OIL PERMEABILITY ABSTRACT OF THE DISCLOSURE A porous, electrical insulating adhesive substrate is made, by uniformly coating a flexible, porous sheet ma- terial with adhesive resin particles having an average par- ticle size of between about 37 to 420 microns, the adhesive coating covering from about 5 to 50 percent of the sheet ma- terial area in a non-patterned random distribution, and then heating the coated sheet material between about 85° to 250°C, forming a discontinuous 0.25 to 7 mil dry coating of discrete adhesive particles having substantially rounded cross sections bonded to the sheet material, said adhesive coating covering from about 5 to 50 percent of the sheet material area in a non-patterned random distribution; the coated sheet may then be inserted as oil permeable layer insulation between high voltage windings and low voltage windings and between layers of high and low voltage windings in a wound coil assembly, after which the assembly can be heated at a temperature and for a time effective to securely bond the winding layers together, to provide a porous, oil permeable, bonded trans- former coil assembly.
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