Patent US3821608A successfully refreshed from Google Patents.
US3821608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enclosed surge diverter
Assignee: ABB Norden Holding AB
•
Filing: 1973-04-06
•
Granted: 1974-06-28
•
Expires: 1993-04-06
Abstract
Abstract A surge diverter is mounted in an inner casing of electrically insulating material which is enclosed in an outer housing of electrically conducting material which is connected to earth. In the space between the inner casing and the housing a number of grading rings in the form of toroid rings are fastened to the inner casing at a distance from it. The grading rings are arranged at a distance from each other which increases counting from the top of the diverter.
Inventors
- 👤 A Johansson
- 👤 B Lyckstedt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:52
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/16; H01T4/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
Enclosed surge diverter (1) comprising a gas and fluid-tight inner casing of electrically insulating material, an outer housing (7) connected to earth surrounding said inner tube casing and formed of electrically conducting material, a plurality of field and voltage grading rings (13) in the space between the inner casing and the outer housing, said grading rings being in the form of toroid tubes fastened on the inner casing and spaced at a distance From it, in which the grading rings are spaced at progressively greater distances from each other as the distance from the top of the diverter increases.
Claim 2
Dependent Claim
99 words
Enclosed surge diverter (1) comprising a gas and fluid-tight inner casing of electrically insulating material, an outer housing (7) connected to earth surrounding said inner tube casing and formed of electrically conducting material, a plurality of field and voltage grading rings (13) in the space between the inner casing and the outer housing, said grading rings being in the form of toroid tubes fastened on the inner casing and spaced at a distance From it, in which the grading rings are spaced at progressively greater distances from each other as the distance from the top of the diverter increases.
Claim 3
Dependent Claim
26 words
Surge diverter according to claim 1, in which the distance between the grading rings increases substantially in inverse proportion to the voltage with respect to earth.
Claim 4
Dependent Claim
41 words
Surge diverter according to claim 1, in which capacitors (14) are connected between the grading rings (13), the capacity of the capacitors decreasing with decreasing voltage between the rings and earth, said grading rings and capacitors constituting an outer grading chain.
Claim 5
Dependent Claim
40 words
Surge diverter according to claim 1, the surge diverter (1) inside the inner casing being provided with an inner grading chain consisting of capacitors (20), in which impedance elements (26) connect said outer grading chain and said inner grading chain.
Claim 6
Dependent Claim
40 words
Surge diverter according to claim 1, in which said inner casing comprises an inner tube (21) and an outer tube (23) with an annular space (24) between the tubes and a valve mechanism (12) connecting said space with the atmosphere.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |