Patent US3377551A successfully refreshed from Google Patents.
US3377551A
Expired / Lapsed
US
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Multiphase current transformer fault indicator
Assignee: General Electric Co
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Filing: 1964-06-26
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Granted: 1968-04-09
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Expires: 1984-06-26
Abstract
No abstract record available.
Inventors
- 👤 Doux William A Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:43
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/28; H02H3/30; H02H3/305; H02H3/08; H02H3/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
A LINE TO LINE AND LINE TO NEUTRAL FAULT DETECTOR FOR A MULTIPHASE SYSTEM, COMPRISING A PLURALITY OF CURRENT TRANSFORMERS, A DIFFERENT PAIR OF SYSTEM PHASE LINES SERVING AS THE PRIMARY WINDINGS FOR EACH TRANSFORMER, SUCH THAT ONE PHASE LINE OF EACH OF SAID PAIRS SERVES AS A PRIMARY WINDING FOR ONLY ONE OF SAID TRANSFORMERS AND THE OTHER PHASE LINE OF EACH OF SAID PAIRS SERVES AS A COMMON PRIMARY WINDING FOR TWO OF SAID TRANSFORMERS, EACH OF SAID TRANSFORMERS HAVING A SECONDARY WINDING, A REFERENCE CIRCUIT, AND MEANS COUPLING SAID SECONDARY WINDINGS TO SAID REFERENCE CIRCUIT TO PROVIDE AN INDICATION OF A FAULT IN RESPONSE TO CURRENT IN SAID SECONDARY WINDINGS THAT EXCEEDS A MAGNITUDE DETERMINED BY SAID REFERENCE CIRCUIT.
Claim 2
Dependent Claim
122 words
A LINE TO LINE AND LINE TO NEUTRAL FAULT DETECTOR FOR A MULTIPHASE SYSTEM, COMPRISING A PLURALITY OF CURRENT TRANSFORMERS, A DIFFERENT PAIR OF SYSTEM PHASE LINES SERVING AS THE PRIMARY WINDINGS FOR EACH TRANSFORMER, SUCH THAT ONE PHASE LINE OF EACH OF SAID PAIRS SERVES AS A PRIMARY WINDING FOR ONLY ONE OF SAID TRANSFORMERS AND THE OTHER PHASE LINE OF EACH OF SAID PAIRS SERVES AS A COMMON PRIMARY WINDING FOR TWO OF SAID TRANSFORMERS, EACH OF SAID TRANSFORMERS HAVING A SECONDARY WINDING, A REFERENCE CIRCUIT, AND MEANS COUPLING SAID SECONDARY WINDINGS TO SAID REFERENCE CIRCUIT TO PROVIDE AN INDICATION OF A FAULT IN RESPONSE TO CURRENT IN SAID SECONDARY WINDINGS THAT EXCEEDS A MAGNITUDE DETERMINED BY SAID REFERENCE CIRCUIT.
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) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |