Insulating coating for transformer wires
AssigneeGeneral Electric Company
InventorRalph G. Flowers
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Abstract
Improved three component insulating coatings for both wet solvent and dry electrostatic application to transformer wires contain an increased epoxy resin concentration and a decreased amount of polyvinyl acetal and phenol aldehyde resins. The increased epoxy content gives substantially improved coatings with no adverse dissipation and hydrolytic effects. The epoxy constituent can range from 30-60 percent by weight providing the ratio of the polyvinyl acetal to phenol aldehyde is kept within the range of from 1 to 1 to 2 to 1.
Claims5
An improved insulating coated transformer wire of the type consisting of a wire having an insulating coating of phenol aldehyde resin, polyvinyl acetal resin and epoxy resin wherein the improvement comprises the composition defined within the accompanying triaxial diagram of FIG. 5.
A method for coating transformer wire with an insulating coating comprising the steps of:
- preparing a composition consisting of 30 to 60 weight percent epoxy resin, and a ratio of from 1.10 to 1.90 polyvinyl acetal resin to phenol aldehyde resin;
- applying the composition to the transformer wire;
- and
- heating the coated transformer wire to a first temperature to fuse the coating;
- and
- heating the coated wire to a second temperature to cause the coating to react.
Dependencies are inferred from the claim text.