Patent US3842186A successfully refreshed from Google Patents.
US3842186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static plate for power transformers
Assignee: ABB Inc USA
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Filing: 1973-10-23
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Granted: 1974-10-15
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Expires: 1993-10-23
Abstract
Abstract A static plate constructed for the enhancement of partial discharge characteristics by the elimination of foil to oil interfaces. The conducting foil of the static plate is positioned between two relatively flexible electrical insulating members and uniformly bonded thereto by a suitable adhesive. The relatively flexible insulating members are disposed between relatively rigid insulating members and bonded thereto by an adhesive which allows some relative movement between the rigid and flexible insulating members. Dimensional changes of the conducting foil and of the rigid insulating members produce irregularities in the surface of the conducting foil. Since the tightly bonded flexible insulating members conform to the shape of the conducting foil, a solid insulating material is always positioned between the conducting foil and the oil dielectric of the transformer. Thus, irregularities in the conducting foil of the static plate do not produce foil to oil interfaces which are conducive to partial discharge.
Inventors
- 👤 G Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:54
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/32; H01F27/324; H01F27/34; H01F27/36; H01F27/363
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
122 words
A static plate for electrical inductive apparatus, comprising: first and second relatively rigid insulating members; first and second relatively flexible insulating members each having first and second sides; an electrically couductive member having first and second sides; the first side of said conductive member being tightly bonded to the first side of said first flexible insulating member by an adhesive; the second side of said conductive member being tightly Bonded to the first side of said second flexible insulating member by an adhesive; the second side of said first flexible insulating member being relatively loosely bonded to the first rigid insulating member; and the second side of said second flexible insulating member being relatively loosely bonded to the second rigid insulating member.
Claim 2
Dependent Claim
122 words
A static plate for electrical inductive apparatus, comprising: first and second relatively rigid insulating members; first and second relatively flexible insulating members each having first and second sides; an electrically couductive member having first and second sides; the first side of said conductive member being tightly bonded to the first side of said first flexible insulating member by an adhesive; the second side of said conductive member being tightly Bonded to the first side of said second flexible insulating member by an adhesive; the second side of said first flexible insulating member being relatively loosely bonded to the first rigid insulating member; and the second side of said second flexible insulating member being relatively loosely bonded to the second rigid insulating member.
Claim 3
Dependent Claim
19 words
The static plate of claim 1 wherein the first and second relatively rigid insulating members are constructed of pressboard.
Claim 4
Dependent Claim
20 words
The static plate of claim 1 wherein the first and second relatively flexible insulating members are constructed of kraft paper.
Claim 5
Dependent Claim
18 words
The static plate of claim 1 wherein the electrically conductive member comprises a sheet of nickel silver foil.
Claim 6
Dependent Claim
38 words
The static plate of claim 1 wherein the adhesive between the electrically conductive member and the flexible insulating members is uniformly disposed to contact substantially all of the adjacent surfaces of the conductive member and the insulating members.
Claim 7
Dependent Claim
28 words
The static plate of claim 1 wherein the adhesive vetween the respective rigid and flexible insulating member is disposed to contact the adjacent surfaces only at spaced positions.
Claim 8
Dependent Claim
34 words
The static plate of claim 1 wherein the adhesive located between the flexible insulating members and the conductive member provides a stronger bond than the adhesive located between the rigid and flexible insulating members.
Claim 9
Dependent Claim
40 words
The static plate of claim 7 wherein the stronger bond is achieved by applying the adhesive between the flexible insulating members and the conductive member over a larger surface area than the adhesive between the rigid and flexible insulating members.
Claim 10
Dependent Claim
33 words
The static plate of claim 7 wherein the stronger bond is achieved by using different adhesives between the flexible insulating members and the conductive member and between the rigid and flexible insulating members.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |