US3611225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical inductive apparatus having liquid and solid dielectric means
Assignee: Westinghouse Electric Corp
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Filing: 1970-06-24
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Granted: 1971-10-05
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Expires: 1990-06-24
Abstract
Abstract Electrical inductive apparatus of the type which includes an insulating structure comprising liquid dielectric means in series with solid insulating means. The solid insulating means is formed of a first organic resin and a filler which includes a second organic resin. The first organic resin is selected to provide the required chemical resistance and mechanical properties and the second organic resin is selected to have a dielectric constant which is lower than the first organic resin, to provide solid insulating means having a composite dielectric constant which more closely matches that of the liquid dielectric means than that of the first organic resin alone.
Inventors
- 👤 Thomas W Dakin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:58
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/002; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/327
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
Electrical apparatus comprising: an enclosure; liquid dielectric means having a predetermined dielectric constant, said liquid dielectric means being disposed in said enclosure; an electrical winding disposed in said enclosure and immersed in said liquid dielectric means; an insulating structure comprising solid insulating means and said liquid dielectric means in series, said insulating structure providing at least a portion of the insulating system for said electrical winding; said solid insulating means including a first organic resin having a dielectric constant greater than that of the liquid dielectric means, and filler means comprising a second organic resin having a dielectric constant lower than that of the first organic resin, to provide a composite dielectric constant for said solid insulating means which more clearly matches the dielectric constant of said liquid dielectric means than that of the first organic resin alone.
Claim 2
Dependent Claim
138 words
Electrical apparatus comprising: an enclosure; liquid dielectric means having a predetermined dielectric constant, said liquid dielectric means being disposed in said enclosure; an electrical winding disposed in said enclosure and immersed in said liquid dielectric means; an insulating structure comprising solid insulating means and said liquid dielectric means in series, said insulating structure providing at least a portion of the insulating system for said electrical winding; said solid insulating means including a first organic resin having a dielectric constant greater than that of the liquid dielectric means, and filler means comprising a second organic resin having a dielectric constant lower than that of the first organic resin, to provide a composite dielectric constant for said solid insulating means which more clearly matches the dielectric constant of said liquid dielectric means than that of the first organic resin alone.
Claim 3
Dependent Claim
18 words
The electrical apparatus of claim 1 wherein the filler means is completely encapsulated by the first organic resin.
Claim 4
Dependent Claim
22 words
The electrical apparatus of claim 1 wherein the first organic resin is an epoxide and the second organic resin is a polyolefin.
Claim 5
Dependent Claim
12 words
The electrical apparatus of claim 3 wherein the polyolefin is isotactic polyethylene.
Claim 6
Dependent Claim
11 words
The electrical apparatus of claim 3 wherein the polyolefin is polypropylene.
Claim 7
Dependent Claim
23 words
The electrical apparatus of claim 1 wherein the first organic resin is a thermoset polyester and a second organic resin is a polyolefin.
Claim 8
Dependent Claim
12 words
The electrical apparatus of claim 6 wherein the polyolefin is isotactic polyethylene.
Claim 9
Dependent Claim
11 words
The electrical apparatus of claim 6 wherein the polyolefin is polypropylene.
Claim 10
Dependent Claim
24 words
The electrical apparatus of claim 1 wherein the second organic resin occupies 20 to 60 percent of the volume of the solid insulating means.
Claim 11
Dependent Claim
74 words
The electrical apparatus of claim 1 wherein the liquid dielectric means has a dielectric constant in the range of about 2 to 2.2, the first organic resin has a dielectric constant in the range of about 3 to 5, a second organiC resin has a dielectric constant in the range of about 2 to 2.3, and the composite dielectric constant of the solid insulating means is in the range of about 2.5 to 3.
Claim 12
Dependent Claim
15 words
The electrical apparatus of claim 11 wherein the liquid dielectric means is a mineral oil.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-04 | 1975-04-05 | 1975-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-04 | 1979-04-05 | 1979-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-04 | 1983-04-05 | 1983-10-05 | $7700.00 | Window Closed / Lapsed |