Patent US3209204A successfully refreshed from Google Patents.
US3209204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase to ground protective systems
Assignee: Westinghouse Electric Corp
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Filing: 1962-02-05
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Granted: 1965-09-28
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Expires: 1982-02-05
Abstract
No abstract record available.
Inventors
- 👤 Jr George D Rockefeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:31
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40; H02H3/402
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
IN A RELAYING ASSEMBLY FOR PROTECTING A POLYPHASE TRANSMISSION LINE, A FIRST SET OF INPUT TERMINALS SUITABLE FOR ENERGIZATION BY POLYPHASE VOLTAGES, A SECOND SET OF TERMINALS SUITABLE FOR ENERGIZATION BY POLYPHASE, CURRENTS, MEANS FOR DERIVING FROM SAID FIRST SET OF INPUT TERMINALS A FIRST QUANTITY DEPENDENT ON THE ZERO-SEQUENCE COMPONENT OF POLYPHASE VOLTAGES APPLIED TO SAID TERMINALS, IMPEDANCE MEANS ENERGIZED BY A ZERO-SEQUENCE CURRENT DERIVED FROM THE SECOND SET OF TERMINALS WHEN THE LASTNAMED TERMINALS ARE ENERGIZED BY POLYPHASE CURRENTS FOR SUBTRACTING FROM SAID FIRST QUANTITY A SECOND QUANTITY DEPENDENT ON A PREDETERMINED ZERO-SEQUENCE IMPEDANCE DROP TO PRODUCE A COMPENSATED THIRD QUANTITY, IMPEDANCE MEANS INCLUDING A PLURALITY OF IMPEDANCES ENERGIZED FROM THE SECOND SET OF TERMINALS OF PRODUCING A SET OF PHASE IMPEDANCE VOLTAGE DROPS EACH CORRESPONDING TO THE FLOW OF A SEPARATE ONE OF A PLURALITY OF PHASE CURRENTS APPLIED TO THE SECOND SET OF TERMINALS THROUGH ONE OF SAID IMPEDANCES, MEANS FOR SUBTRACTING EACH OF SAID PHASE IMPEDANCE VOLTAGE DROPS FROM A CORRESPONDING PHASE VOLTAGE DERIVED FROM THE FIRST SET OF TERMINALS TO PRODUCE A SET OF COMPENSATED FOURTH QUANTITIES, AND OUTPUT MEANS FOR PRODUCING AN OUTPUT WHEN SAID THIRD QUANTITY BEARS A PREDETERMINED RELATION TO SAID FOURTH QUANTITIES.
Claim 2
Dependent Claim
202 words
IN A RELAYING ASSEMBLY FOR PROTECTING A POLYPHASE TRANSMISSION LINE, A FIRST SET OF INPUT TERMINALS SUITABLE FOR ENERGIZATION BY POLYPHASE VOLTAGES, A SECOND SET OF TERMINALS SUITABLE FOR ENERGIZATION BY POLYPHASE, CURRENTS, MEANS FOR DERIVING FROM SAID FIRST SET OF INPUT TERMINALS A FIRST QUANTITY DEPENDENT ON THE ZERO-SEQUENCE COMPONENT OF POLYPHASE VOLTAGES APPLIED TO SAID TERMINALS, IMPEDANCE MEANS ENERGIZED BY A ZERO-SEQUENCE CURRENT DERIVED FROM THE SECOND SET OF TERMINALS WHEN THE LASTNAMED TERMINALS ARE ENERGIZED BY POLYPHASE CURRENTS FOR SUBTRACTING FROM SAID FIRST QUANTITY A SECOND QUANTITY DEPENDENT ON A PREDETERMINED ZERO-SEQUENCE IMPEDANCE DROP TO PRODUCE A COMPENSATED THIRD QUANTITY, IMPEDANCE MEANS INCLUDING A PLURALITY OF IMPEDANCES ENERGIZED FROM THE SECOND SET OF TERMINALS OF PRODUCING A SET OF PHASE IMPEDANCE VOLTAGE DROPS EACH CORRESPONDING TO THE FLOW OF A SEPARATE ONE OF A PLURALITY OF PHASE CURRENTS APPLIED TO THE SECOND SET OF TERMINALS THROUGH ONE OF SAID IMPEDANCES, MEANS FOR SUBTRACTING EACH OF SAID PHASE IMPEDANCE VOLTAGE DROPS FROM A CORRESPONDING PHASE VOLTAGE DERIVED FROM THE FIRST SET OF TERMINALS TO PRODUCE A SET OF COMPENSATED FOURTH QUANTITIES, AND OUTPUT MEANS FOR PRODUCING AN OUTPUT WHEN SAID THIRD QUANTITY BEARS A PREDETERMINED RELATION TO SAID FOURTH QUANTITIES.
References Cited (Backward Citations)
US2408208A
Cited
US2445429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |