US3633140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry insulated transformer
Assignee: Chemetron Corp
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Filing: 1970-08-26
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Granted: 1972-01-04
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Expires: 1990-08-26
Abstract
Abstract This disclosure includes a high-voltage dry-insulated transformer and to the method of constructing the transformer. The primary coil is a multiple-turn, multiple-layer winding constructed by alternately winding a coil layer and then insulation sheets or tape on a winding form. The insulation sheet is a nonwoven glass filament cloth which is impregnated with a semicured epoxy resin. A plurality of insulating cloth layers are wrapped about the primary coil to define the necessary intercoil insulation. The secondary coil is then similarly formed. The interlayer and intercoil insulating cloth extends beyond the axial end faces of the coils and the space is filled by wrapping of a corresponding tape between the two extended layers. The cloth is applied under tension and heat and the exterior of each layer is rolled to exclude air and cause the resin to flow into the voids and crevices. The exterior is wrapped with a shrinktype Mylar and the ends of the assembly are capped to confine the insulating resin during the curing and processing cycle, the Mylar acts as a positive force during curing to cause the resin to flow into all voids in the coil. The Mylar is removed after the coil has been cured.
Inventors
- 👤 Glen W Lake
- 👤 Myron D Coeper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:20
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/005; H01F27/00; H01F27/02; H01F27/022; H01F27/28; H01F27/32; H01F27/327; H01F41/02; H01F41/04; H01F41/12; H01F41/122; H01F41/127; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49071
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
An inductive coil means to be formed into a totally encapsulated coil comprising, a plurality of spaced coil layers, insulation disposed between said layers and including at least one layer of a cloth material impregnated with an uncured resin, said cloth material projecting axially substantially of said coil layers, and means responsive to heat for compressing said coil layers by shrinking into tight engagement therewith to cause the resin in the insulation to flow into the voids and crevices of the coil thereby forming a solid insulating mass.
Claim 2
Dependent Claim
88 words
An inductive coil means to be formed into a totally encapsulated coil comprising, a plurality of spaced coil layers, insulation disposed between said layers and including at least one layer of a cloth material impregnated with an uncured resin, said cloth material projecting axially substantially of said coil layers, and means responsive to heat for compressing said coil layers by shrinking into tight engagement therewith to cause the resin in the insulation to flow into the voids and crevices of the coil thereby forming a solid insulating mass.
Claim 3
Dependent Claim
62 words
The inductive coil means of claim 1 wherein said insulation is totally of a nonwoven cloth material impregnated with an uncured resin and includes a layer of cloth material between each coil layer, said cloth material projecting axially outwardly of said coil layers, and a plurality of superimposed layers of said cloth material filling the end spaces aligned with said coil layers.
Claim 4
Dependent Claim
125 words
The inductive coil means of claim 1 including a spaced multilayer secondary winding having a pluralIty of spaced coil layers, and an interlayer of cloth material impregnated with an uncured resin being disposed between each layer of said secondary winding, means responsive to heat for compressing said secondary winding by shrinking into tight engagement therewith to cause the resin to flow into the voids and crevices forming a solid insulating mass, and a plurality of layers of a cloth material disposed between said windings to form an intercoil insulation, and means responsive to heat for compressing said intercoil insulation by shrinking into tight engagement therewith to cause the resin in the intercoil insulation to flow into the voids and crevices forming a solid insulating mass.
Claim 5
Dependent Claim
50 words
The inductive coil means of claim 3, wherein the interlayer and intercoil cloth material of said secondary winding projects axially outward to define end insulation, and a plurality of layers of cloth material impregnated with an uncured resin concentrically wrapped between said projecting cloth material to complete the end insulation.
Claim 6
Dependent Claim
32 words
The inductive coil means of claim 1 having outwardly extending terminal means and integral stress cones extending outwardly about said terminals from the outermost layers of insulation to reduce dielectric stress concentration.
Claim 7
Dependent Claim
89 words
An inductive coil means to be formed into a totally encapsulated coil comprising, a plurality of spaced coil layers, and insulation disposed between said layers including a layer of a cloth material impregnated with an uncured resin between each coil layer, and a heat-shrinkable cover responsive to the flow temperature of the resin covering said coil layers and insulation whereby heating of said coil shrinks said cover and forces the resin to flow into the voids and crevices in the coil layers to create a solid and continuous insulation.
Claim 8
Dependent Claim
89 words
An inductive coil means to be formed into a totally encapsulated coil comprising, a plurality of spaced coil layers, and insulation disposed between said layers including a layer of a cloth material impregnated with an uncured resin between each coil layer, and a heat-shrinkable cover responsive to the flow temperature of the resin covering said coil layers and insulation whereby heating of said coil shrinks said cover and forces the resin to flow into the voids and crevices in the coil layers to create a solid and continuous insulation.
Claim 9
Dependent Claim
34 words
The inductive coil means of claim 1 wherein said insulation is totally of a nonwoven cloth material impregnated with an uncured resin and includes a layer of said cloth material between each coil layer.
References Cited (Backward Citations)
US3297970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |