US3143687A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay protection for capacitor banks
Assignee: ABB Norden Holding AB
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Filing: 1957-04-18
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Granted: 1964-08-04
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Expires: 1977-04-18
Abstract
No abstract record available.
Inventors
- 👤 Hjertberg Peter Gustav
- 👤 Skogby Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:01
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A CAPACITOR BANK ADAPTED TO BE CONNECTED TO AN ALTERNATING CURRENT POWER LINE, SAID CAPACITOR BANK INCLUDING TWO SIMILAR PARALLEL BRANCHES, EACH OF SAID BRANCHES COMPRISING A PLURALITY OF SERIES-CONNECTED GROUPS AND EACH GROUP COMPRISING A PLURALITY OF CAPACITOR UNITS CONNECTED IN PARALLEL, MEANS FOR CONNECTING THE CAPACITOR BANK TO SAID POWER LINE, A TRANSFORMER CONNECTED BETWEEN CORRESPONDING POINTS ON SAID BRANCHES, THE IMPEDANCES OF SAID BRANCHES BEING DIFFERENT AND AN UNBALANCE CURRENT NORMALLY FLOWING BETWEEN SAID POINTS, WHEREBY AN ALTERNATING CURRENT SIGNAL IS DEVELOPED BY SAID TRANSFORMER PHASE SHIFTING AND MAGNITUDE VARYING MEANS FOR DERIVING AN ALTERNATING CURRENT SIGNAL EQUAL IN MAGNITUDE AND OPPOSITE IN PHASE TO SAID SIGNAL DEVELOPED BY SAID TRANSFORMER, MEANS FOR VECTORIALLY ADDING SAID DERIVED SIGNAL AND SAID SIGNAL DEVELOPED BY SAID TRANSFORMER, AND RELAY MEANS ENERGIZED FROM THE OUTPUT OF SAID LAST-NAMED MEANS.
Claim 2
Dependent Claim
139 words
A CAPACITOR BANK ADAPTED TO BE CONNECTED TO AN ALTERNATING CURRENT POWER LINE, SAID CAPACITOR BANK INCLUDING TWO SIMILAR PARALLEL BRANCHES, EACH OF SAID BRANCHES COMPRISING A PLURALITY OF SERIES-CONNECTED GROUPS AND EACH GROUP COMPRISING A PLURALITY OF CAPACITOR UNITS CONNECTED IN PARALLEL, MEANS FOR CONNECTING THE CAPACITOR BANK TO SAID POWER LINE, A TRANSFORMER CONNECTED BETWEEN CORRESPONDING POINTS ON SAID BRANCHES, THE IMPEDANCES OF SAID BRANCHES BEING DIFFERENT AND AN UNBALANCE CURRENT NORMALLY FLOWING BETWEEN SAID POINTS, WHEREBY AN ALTERNATING CURRENT SIGNAL IS DEVELOPED BY SAID TRANSFORMER PHASE SHIFTING AND MAGNITUDE VARYING MEANS FOR DERIVING AN ALTERNATING CURRENT SIGNAL EQUAL IN MAGNITUDE AND OPPOSITE IN PHASE TO SAID SIGNAL DEVELOPED BY SAID TRANSFORMER, MEANS FOR VECTORIALLY ADDING SAID DERIVED SIGNAL AND SAID SIGNAL DEVELOPED BY SAID TRANSFORMER, AND RELAY MEANS ENERGIZED FROM THE OUTPUT OF SAID LAST-NAMED MEANS.
References Cited (Backward Citations)
AT127734B
Cited
US2931950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |