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Patent

A molded coil

K Hirakawa, +2 more
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TLDR
A mold transformer consisting of a blank coil impregnated with an electrical insulating resin composition of epoxy resin or the like, said blank coil having as an insulator a highly impregnable nonwoven polyester fabric or non-woven glass fabric interposed between a high voltage winding and a low voltage winding, between the high voltage wound and a magnetic core and between the lowvoltage wound and the magnetic core respectively, and a non-wrapping polyester fiber between adjacent winding layers of each of the high-voltage and low voltage windings; and a method
Abstract: 
A mold transformer consisting of a blank coil impregnated with an electrical insulating resin composition of epoxy resin or the like, said blank coil having as an insulator a highly impregnable non-woven polyester fabric or non-woven glass fabric interposed between a high-voltage winding and a low-voltage winding, between the high voltage winding and a magnetic core and between the lowvoltage winding and the magnetic core respectively, and a nonwoven polyester fabric between adjacent winding layers of each of the high-voltage and low-voltage windings; and a method of producing said mold transformer.

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Integrated cooling duct for resin-encapsulated distribution transformer coils

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TL;DR: In this article, a dry-type, resin-encapsulated transformer coil that includes multiple layers from a length of conductive material, and multiple cooling ducts that are formed of thermoplastic material and spaced between the layers, is described.
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