Patent US2590802A successfully refreshed from Google Patents.
Patent US3223891A successfully refreshed from Google Patents.
US3223891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pilot-wire protection of transmission lines
Assignee: Individual
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Filing: 1961-12-20
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Granted: 1965-12-14
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Expires: 1981-12-20
Abstract
No abstract record available.
Inventors
- 👤 Kenneth R Mcclymont
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:55
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/28; H02H3/30; H02H3/307
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A PILOT-WIRE ARRANGEMENT FOR PROTECTING A THREEPHASE ELECTRIC TRANSMISSION LINE HAVING A PLURALITY OF TERMINALS, COMPRISING A LINE CIRCUIT BREAKER AT EACH TERMINAL, A RELAY FOR EACH TERMINAL FOR OPENING THE CIRCUIT BREAKER OF THE TERMINAL, CURRENT TRANSFORMERS IN THE LINE AT EACH TERMINAL, PILOT-WIRES PROVIDING AN ELECTRICAL PATH BETWEEN THE TERMINALS, AND A RELAY CONTROL CIRCUIT FOR EACH TERMINAL WITH CONNECTIONS BETWEEN THE PILOT-WIRES AND THE CURRENT TRANSFORMERS OF THE TERMINAL OF SUCH POLARITY THAT A CURRENT NORMALLY CIRCULATES IN THE PILOT-WIRES, THE CONNECTIONS OF EACH CONTROL CIRCUIT INCLUDING A MIXING TRANSFORMERS HAVING AN INPUT FROM THE CURRENT TRANSFORMERS OF THE TERMINAL AND A TWO LINE OUTPUT FOR DELIVERING A CURRENT WHICH IS A FUNCTION OF THE POSITIVE, NEGATIVE AND ZERO SEQUENCE COMPONENTS OF THE CURRENTS FROM THE CURRENT TRANSFORMERS AND IS SUBSTANTIALLY INDEPENDENT OF THE IMPEDANCE OF THE PILOT-WIRES, AND AN INSULATING TRANSFORMER CONNECTED BETWEEN THE TWO LINE OUTPUT AND THE PILOTWIRES, MEANS CONNECTED ACROSS THE TWO LINE OUTPUT FOR
Claim 2
Dependent Claim
162 words
A PILOT-WIRE ARRANGEMENT FOR PROTECTING A THREEPHASE ELECTRIC TRANSMISSION LINE HAVING A PLURALITY OF TERMINALS, COMPRISING A LINE CIRCUIT BREAKER AT EACH TERMINAL, A RELAY FOR EACH TERMINAL FOR OPENING THE CIRCUIT BREAKER OF THE TERMINAL, CURRENT TRANSFORMERS IN THE LINE AT EACH TERMINAL, PILOT-WIRES PROVIDING AN ELECTRICAL PATH BETWEEN THE TERMINALS, AND A RELAY CONTROL CIRCUIT FOR EACH TERMINAL WITH CONNECTIONS BETWEEN THE PILOT-WIRES AND THE CURRENT TRANSFORMERS OF THE TERMINAL OF SUCH POLARITY THAT A CURRENT NORMALLY CIRCULATES IN THE PILOT-WIRES, THE CONNECTIONS OF EACH CONTROL CIRCUIT INCLUDING A MIXING TRANSFORMERS HAVING AN INPUT FROM THE CURRENT TRANSFORMERS OF THE TERMINAL AND A TWO LINE OUTPUT FOR DELIVERING A CURRENT WHICH IS A FUNCTION OF THE POSITIVE, NEGATIVE AND ZERO SEQUENCE COMPONENTS OF THE CURRENTS FROM THE CURRENT TRANSFORMERS AND IS SUBSTANTIALLY INDEPENDENT OF THE IMPEDANCE OF THE PILOT-WIRES, AND AN INSULATING TRANSFORMER CONNECTED BETWEEN THE TWO LINE OUTPUT AND THE PILOTWIRES, MEANS CONNECTED ACROSS THE TWO LINE OUTPUT FOR
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |