Patent US3753045A successfully refreshed from Google Patents.
US3753045A
Expired / Lapsed
US
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Shielded metal enclosed lightning arrester
Assignee: ABB Inc USA
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Filing: 1972-10-11
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Granted: 1973-08-14
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Expires: 1992-10-11
Abstract
Abstract A high voltage lightning arrester enclosed in a grounded metal enclosure containing a pressurized insulating gas. The arrester is provided with capacitance grading means to control the voltage distribution across the arrester.
Inventors
- 👤 N Osmundsen
- 👤 J Harder
- 👤 T Nitta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:49
CPC Classifications
H; H01; H01T; H01T4/00; H01T4/16; H01T4/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
In combination, a grounded metal enclosure containing an insulating gas, a lightning arrester disposed within said enclosure, said arrester having line terminal means at one end thereof and ground terminal means at the other end, a plurality of conducting shields encircling the arrester and spaced apart axially of the arrester, one of said shields encircling said line terminal means and being electrically connected thereto, and a capacitor connected between each two adjacent shields.
Claim 2
Dependent Claim
73 words
In combination, a grounded metal enclosure containing an insulating gas, a lightning arrester disposed within said enclosure, said arrester having line terminal means at one end thereof and ground terminal means at the other end, a plurality of conducting shields encircling the arrester and spaced apart axially of the arrester, one of said shields encircling said line terminal means and being electrically connected thereto, and a capacitor connected between each two adjacent shields.
Claim 3
Dependent Claim
20 words
The combination of claim 1 in which said capacitors extend axially along one side of the arrester within the shields.
Claim 4
Dependent Claim
22 words
The combination of claim 1 in which said capacitors have different capacitances to establish a desired distribution of voltage across the arrester.
Claim 5
Dependent Claim
31 words
The combination of claim 1 in which said capacitors progressively decrease in capacitance from the line terminal end of the arrester to establish a uniform distribution of voltage across the arrester.
Claim 6
Dependent Claim
58 words
The combination of claim 1 in which said line terminal means includes means for effecting electrical connection to an external conductor, a conductive plate member in conductive relation to the terminal means, the uppermost one of said shields being attached to said plate member, and meaNs for connecting the uppermost one of said capacitors to the plate member.
Claim 7
Dependent Claim
55 words
The combination of claim 1 in which a plurality of circular members are clamped around the arrester in spaced positions, said one shield being supported from the line terminal means, means for mounting each of the other shields on one of said circular members, and means for connecting said capacitors to the adjacent circular members.
Claim 8
Dependent Claim
51 words
The combination of claim 1 in which said ground terminal means includes a conducting bottom cap having a central opening therein, and means for attaching said cap to the metal enclosure with a sealed connection, the enclosure having an opening adjacent said opening in the cap and within the sealed connection.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |