US3911384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing the dielectric strength in metal electrodes
Assignee: ABB Norden Holding AB
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Filing: 1974-06-19
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Granted: 1975-10-07
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Expires: 1994-06-19
Abstract
Abstract For increasing the dielectric strength in metal electrodes, particularly in parts of the electrodes around which there prevail inhomogeneous electrical fields with uncontrollable electrical field strength, a layer of resin with a dielectric constant which is high in comparison with the dielectric constant of transformer oil is applied to the electrode by means of electrostatic spraying.
Inventors
- 👤 Olle Andersson
- 👤 Ellerth Ericsson
- 👤 Svante Forsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:12
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/324; H01F41/00; H01B; H01B17/00; H01B17/56; H01B17/62; H01F27/34; H01F41/005
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
110 words
In an electrical apparatus, first and second members formed of conductive material with an insulating liquid therebetween, one of said members being a live member, one of the members having a surface exposed to the insulating liquid, said surface having portions which are exposed to a considerably greater field strength than other portions of the surface when a high voltage exists in such live element, and a layer on such surface of a resin with a dielectric constant which is high in comparison with the dielectric constant of the insulating liquid, said layer being substantially thicker at such portions exposed to the greater field strength than at such other portions.
Claim 2
Dependent Claim
110 words
In an electrical apparatus, first and second members formed of conductive material with an insulating liquid therebetween, one of said members being a live member, one of the members having a surface exposed to the insulating liquid, said surface having portions which are exposed to a considerably greater field strength than other portions of the surface when a high voltage exists in such live element, and a layer on such surface of a resin with a dielectric constant which is high in comparison with the dielectric constant of the insulating liquid, said layer being substantially thicker at such portions exposed to the greater field strength than at such other portions.
Claim 3
Dependent Claim
15 words
Apparatus as claimed in claim 1, in which said layer is produced by electrostatic spraying.
Claim 4
Dependent Claim
14 words
An arrangement as claimed in claim 1, in which said apparatus is a transformer.
References Cited (Backward Citations)
US2730461A
Cited
US3265998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |