Power control system having fault sensing means
Abstract
Abstract A SYSTEM FOR CONTROLLING THE SUPPLY OF ELECTRICAL POWER FROM A BALANCED POLYPHASE POWER SOURCE TO A LOAD SUCH AS THE PHASE WINDINGS OF AN ELECTRICAL MOTOR IN WHICH MEANS ARE PROVIDED FOR SENSING IMPROPER APPLICATION OF THE POWER TO THE LOAD. A PLURALITY OF SELECTIVELY ENERGIZABLE A.C. POWER SWITCHES EACH HAVING FIRST AND SECOND POWER TERMINALS AND A CONTROL TERMINAL ARE ADAPTED TO COUPLE ASSOCIATED ONES OF THE POWER TERMINALS OF THE SOURCE TO THE LOAD. A SUBSTANTIALLY NON-REACTIVE, HIGH IMPEDANCE LINE NEUTRAL SENSING NETWORK HAVING A JUNCTION DEFINING A LINE NEUTRAL POINT IS CONNECTED ACROSS THE FIRST POWER TERMINALS OF THE A.C. POWER SWITCHES, WHILE SIMILAR LOAD NEUTRAL SENSING NETWORK HAVING A JUNCTION DEFINING A LOAD NEUTRAL POINT IS CONNECTED ACROSS THE SECOND POWER TERMINALS OF THE A.C. POWER SWITCHES. MEANS ARE COUPLED BETWEEN THE LINE NEUTRAL JUNCTION AND THE LOAD NEUTRAL JUNCTION FOR SENSING A DIFFERENCE IN ELECTRICAL POTENTIAL THEREBETWEEN AS AN INDICATION OF SYSTEM MIS-OPERATION.
Inventors
- 👤 A Grenier
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |