US3303390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distance relaying
Assignee: Westinghouse Electric Corp
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Filing: 1963-06-07
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Granted: 1967-02-07
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Expires: 1983-06-07
Abstract
No abstract record available.
Inventors
- 👤 William K Sonnemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:14
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
IN A PROTECTIVE RELAY FOR AN ALTERNATING CURRENT LINE, A FIRST MEANS FOR PRODUCING A VOLTAGE HAVING A SCALAR VALUE PROPORTIONAL TO THE LINE CURRENT, A SECOND MEANS PRODUCING A VOLTAGE HAVING A SCALAR VALUE PROPORTIONAL TO THE LINE VOLTAGE AT SAID RELAY, AND A THIRD MEANS PRODUCING A VOLTAGE PROPORTIONAL TO THE SCALAR VALUE OF THE VECTOR QUANTITY E-ZCI WHERE E IS THE VECTOR QUANTITY PROPORTIONAL TO LINE VOLTAGE, I A VECTOR QUANTITY PROPORTIONAL TO LINE CURRENT, AND ZC IS A VECTOR QUANTITY HAVING A PHASE ANGLE EQUAL TO THE PHASE ANGLE OF THE NATURAL IMPEDANCE OF THAT PORTION OF THE LINE WHICH IS TO BE PROTECTED, AND A SIGNAL-OUTPUT CIRCUIT ENERGIZED WHENEVER THE VOLTAGE PRODUCED BY SAID FIRST MEANS EXCEEDS THE SUM OF THE VOLTAGE PRODUCED BY SAID SECOND MEANS PLUS THE VOLTAGE OF SAID THIRD MEANS.
Claim 2
Dependent Claim
139 words
IN A PROTECTIVE RELAY FOR AN ALTERNATING CURRENT LINE, A FIRST MEANS FOR PRODUCING A VOLTAGE HAVING A SCALAR VALUE PROPORTIONAL TO THE LINE CURRENT, A SECOND MEANS PRODUCING A VOLTAGE HAVING A SCALAR VALUE PROPORTIONAL TO THE LINE VOLTAGE AT SAID RELAY, AND A THIRD MEANS PRODUCING A VOLTAGE PROPORTIONAL TO THE SCALAR VALUE OF THE VECTOR QUANTITY E-ZCI WHERE E IS THE VECTOR QUANTITY PROPORTIONAL TO LINE VOLTAGE, I A VECTOR QUANTITY PROPORTIONAL TO LINE CURRENT, AND ZC IS A VECTOR QUANTITY HAVING A PHASE ANGLE EQUAL TO THE PHASE ANGLE OF THE NATURAL IMPEDANCE OF THAT PORTION OF THE LINE WHICH IS TO BE PROTECTED, AND A SIGNAL-OUTPUT CIRCUIT ENERGIZED WHENEVER THE VOLTAGE PRODUCED BY SAID FIRST MEANS EXCEEDS THE SUM OF THE VOLTAGE PRODUCED BY SAID SECOND MEANS PLUS THE VOLTAGE OF SAID THIRD MEANS.
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) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |