US3374426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage regulated polyphase auto transformer
Assignee: English Electric Co Ltd
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Filing: 1965-12-08
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Granted: 1968-03-19
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Expires: 1985-12-08
Abstract
No abstract record available.
Inventors
- 👤 Bedil Fahir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:42
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/10; H02M5/12; H01; H01F; H01F29/00; H01F29/02; H01F29/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
IN A THREE PHASE ELECTRICAL AUTO-TRANSFORMER, THREE MAIN WINDINGS AND AN AUXILIARY THREE PHASE DELTA CONNECTED WINDING, EACH MAIN WINDING COMPRISING FIRST, SECOND AND THIRD WINDING PORTIONS WITH THE SECOND AND THIRD PORTIONS CONNECTED IN SERIES, EACH FIRST WINDING PORTION HAVING TAPPING POINTS THEREON, A FIRST TERMINAL CONNECTION CONNECTED TO THE OUTERMOST END OF EACH THIRD WINDING PORTION, A SECOND TERMINAL CONNECTION CONNECTED BETWEEN THE JUNCTION OF EACH SECOND AND THIRD WINDING PORTION, A THIRD TERMINAL CONNECTION CONNECTED TO THE INNERMOST END OF EACH SECOND WINDING PORTION, TAPCHANGING MEANS ASSOCIATED WITH THE TAPPING POINTS OF EACH FIRST WINDING PORTION AND EACH THIRD TERMINAL CONNECTION AND SERVING TO CONNECT THE THREE MAIN WINDINGS TO A COMMON STAR POINT AND TO RAISE OR LOWER THE OUTPUT VOLTAGE FROM THOSE TERMINAL CONNECTIONS SERVING AS OUTPUT TERMINALS OF THE TRANSFORMER, ADDITIONAL TRANSFORMER MEANS HAVING FIRST, SECOND AND THIRD PRIMARY WINDINGS AND ASSOCIATED FIRST, SECOND AND THIRD SECONDARY WINDINGS, ONE END OF EACH SUCH SECONDARY WINDING BEING CONNECTED TO A RESPECTIVE JUNCTION POINT OF THE WINDINGS OF SAID DELTA WINDING, THE PRIMARY WINDINGS OF THE ADDITIONAL TRANSFORMER MEANS BEING CONNECTED ACROSS RESPECTIVE PAIRS OF SAID THIRD TERMINAL CONNECTIONS SO THAT THE SECONDARY WINDINGS OF THE
Claim 2
Dependent Claim
200 words
IN A THREE PHASE ELECTRICAL AUTO-TRANSFORMER, THREE MAIN WINDINGS AND AN AUXILIARY THREE PHASE DELTA CONNECTED WINDING, EACH MAIN WINDING COMPRISING FIRST, SECOND AND THIRD WINDING PORTIONS WITH THE SECOND AND THIRD PORTIONS CONNECTED IN SERIES, EACH FIRST WINDING PORTION HAVING TAPPING POINTS THEREON, A FIRST TERMINAL CONNECTION CONNECTED TO THE OUTERMOST END OF EACH THIRD WINDING PORTION, A SECOND TERMINAL CONNECTION CONNECTED BETWEEN THE JUNCTION OF EACH SECOND AND THIRD WINDING PORTION, A THIRD TERMINAL CONNECTION CONNECTED TO THE INNERMOST END OF EACH SECOND WINDING PORTION, TAPCHANGING MEANS ASSOCIATED WITH THE TAPPING POINTS OF EACH FIRST WINDING PORTION AND EACH THIRD TERMINAL CONNECTION AND SERVING TO CONNECT THE THREE MAIN WINDINGS TO A COMMON STAR POINT AND TO RAISE OR LOWER THE OUTPUT VOLTAGE FROM THOSE TERMINAL CONNECTIONS SERVING AS OUTPUT TERMINALS OF THE TRANSFORMER, ADDITIONAL TRANSFORMER MEANS HAVING FIRST, SECOND AND THIRD PRIMARY WINDINGS AND ASSOCIATED FIRST, SECOND AND THIRD SECONDARY WINDINGS, ONE END OF EACH SUCH SECONDARY WINDING BEING CONNECTED TO A RESPECTIVE JUNCTION POINT OF THE WINDINGS OF SAID DELTA WINDING, THE PRIMARY WINDINGS OF THE ADDITIONAL TRANSFORMER MEANS BEING CONNECTED ACROSS RESPECTIVE PAIRS OF SAID THIRD TERMINAL CONNECTIONS SO THAT THE SECONDARY WINDINGS OF THE
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |