US4547831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surge arrester
Assignee: ABB Norden Holding AB
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Filing: 1983-02-28
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Granted: 1985-10-15
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Expires: 2003-02-28
Abstract
Abstract A surge arrester includes an elongated insulating housing comprising one or more stacks of electrically series-connected metal oxide varistor blocks arranged between a top terminal and a bottom terminal. To achieve a more even voltage distribution in the longitudinal direction of the surge arrester, the surge arrester comprises larger varistor blocks at the top terminal than at the bottom terminal.
Inventors
- 👤 Per-Ake Hellman
- 👤 Lennart Stenstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:27
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/10; H01C7/12; H01C7/123; H01T; H01T4/00; H01T4/16; H01T4/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
A surge arrester comprising a top terminal, a bottom terminal and at least one surge arrester unit connected between said top and bottom terminals, said surge arrester unit comprising an elongated electrically insulating housing and a plurality of electrically series-connected metal oxide varistor blocks arranged in a stack or in a plurality of electrically series-connected stacks in the electrically insulating housing, the varistor blocks at the top terminal of the arrester having a greater diameter than the varistor blocks at the bottom terminal of the arrester.
Claim 2
Dependent Claim
86 words
A surge arrester comprising a top terminal, a bottom terminal and at least one surge arrester unit connected between said top and bottom terminals, said surge arrester unit comprising an elongated electrically insulating housing and a plurality of electrically series-connected metal oxide varistor blocks arranged in a stack or in a plurality of electrically series-connected stacks in the electrically insulating housing, the varistor blocks at the top terminal of the arrester having a greater diameter than the varistor blocks at the bottom terminal of the arrester.
Claim 3
Dependent Claim
45 words
Surge arrester according to claim 1, wherein the diameter of the varistor blocks at the upper end of the surge arrester is at least 5% and at most 80% greater than the diameter of the varistor blocks at the lower end of the surge arrester.
Claim 4
Dependent Claim
94 words
A surge arrester comprising a top terminal, a bottom terminal and at least two surge arrester units electrically connected in series between said top and bottom terminals, each surge arrester unit comprising an elongated electrically insulating housing, provided with metallic flange means, and a plurality of electrically series-connected metal oxide varistor blocks arranged in a stack in the electrically insulating housing, the varistor blocks in the surge arrester unit which is nearest the top terminal having a greater diameter than the varistor blocks in the surge arrester unit which is nearest the bottom terminal.
Claim 5
Dependent Claim
94 words
A surge arrester comprising a top terminal, a bottom terminal and at least two surge arrester units electrically connected in series between said top and bottom terminals, each surge arrester unit comprising an elongated electrically insulating housing, provided with metallic flange means, and a plurality of electrically series-connected metal oxide varistor blocks arranged in a stack in the electrically insulating housing, the varistor blocks in the surge arrester unit which is nearest the top terminal having a greater diameter than the varistor blocks in the surge arrester unit which is nearest the bottom terminal.
Claim 6
Dependent Claim
45 words
Surge arrester according to claim 3, wherein the diameter of the varistor blocks at the upper end of the surge arrester is at least 5% and at most 80% greater than the diameter of the varistor blocks at the lower end of the surge arrester.
Claim 7
Dependent Claim
20 words
Surge arrester according to claim 3, wherein one and the same surge arrester unit comprises varistor blocks of different diameters.
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) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |