Patent US3720409A successfully refreshed from Google Patents.
Patent US4295174A successfully refreshed from Google Patents.
US4295174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-series group capacitor bank protection equipment
Assignee: Westinghouse Electric Corp
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Filing: 1979-05-29
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Granted: 1981-10-13
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Expires: 1999-05-29
Abstract
Abstract A multi-series group capacitor bank has voltage limiters, of the metal oxide type, connected across each individual series group and set at a protection level higher than that of the bank bypass spark gap so the voltage limiters bypass a series group when capacitor fuse clearing causes high voltage build-up in that series group.
Inventors
- 👤 Charles A. Peterson
- 👤 Louis C. Grove, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:04
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/06; H02H7/00; H02H7/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
128 words
Capacitor apparatus comprising: a plurality of capacitor units in a bank arranged in a plurality of series groups with a plurality of units in parallel with each other within each series group; a fuse means connected with each capacitor unit; bypass means connected across a plurality of said series groups, said bypass means having a predetermined protection level sufficient to protect said capacitor units against transients to which said bank is subjected; and voltage limiter means connected individually across each of said series groups and having a predetermined protection level higher than that of said bypass means, said voltage limiter means operable to temporarily bypass a series group upon one of said fuse means of one of said units clearing due to conditions not affecting said bypass means.
Claim 2
Dependent Claim
128 words
Capacitor apparatus comprising: a plurality of capacitor units in a bank arranged in a plurality of series groups with a plurality of units in parallel with each other within each series group; a fuse means connected with each capacitor unit; bypass means connected across a plurality of said series groups, said bypass means having a predetermined protection level sufficient to protect said capacitor units against transients to which said bank is subjected; and voltage limiter means connected individually across each of said series groups and having a predetermined protection level higher than that of said bypass means, said voltage limiter means operable to temporarily bypass a series group upon one of said fuse means of one of said units clearing due to conditions not affecting said bypass means.
Claim 3
Dependent Claim
22 words
The subject matter of claim 1 wherein said bank is a series capacitor bank in series with an alternating current transmission line.
Claim 4
Dependent Claim
19 words
The subject matter of claim 2 wherein said bypass means is connected across each half of said series groups.
Claim 5
Dependent Claim
21 words
The subject matter of claim 2 wherein said bypass means comprises a single spark gap device connected across the entire bank.
Claim 6
Dependent Claim
22 words
The subject matter of claim 1 wherein said bank is a shunt capacitor bank connected for power factor correction of an inductance.
Claim 7
Dependent Claim
17 words
The subject matter of claim 1 wherein said voltage limiters each comprise a metal oxide voltage limiter.
Claim 8
Dependent Claim
26 words
The subject matter of claim 1 wherein said metal oxide voltage limiters are arranged in a plurality of elements across each series group of capacitor units.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |