Automatic paralleling system
Abstract
Abstract A CIRCUIT FOR CONTROLLING THE CONNECTION OF AN ALTERNATING CURRENT GENERATOR TO AN ENERGIZED LINE FOR PARALLEL OPERATION WITH ANOTHER GENERATOR IS PROVIDED WITH TRANSISTOR SWITCHING CIRCUIT MEANS RESPONSIVE TO THE VOLTAGE WAVEFORMS OF THE GENERATOR AND OF THE LINE TO PRODUCE A COMBINED WAVEFORM WITH THE DURATION AT THE MAXIMUM OF THE COMBINED WAVEFORM BEING DIRECTLY PROPORTIONAL TO THE PHASE DIFFERENCE, DURING WHICH A CAPACITOR IS CHARGED WHOSE DISCHARGE SIGNAL IS ONE INPUT TO A DIFFERENTIAL AMPLIFIER. THE OTHER INPUT OF THE DIFFERENTIAL AMPLIFIER IS A REFERENCE SIGNAL SO THAT AN OUTPUT SIGNAL, RESULTING IN CLOSING OF A SWITCH FOR PARALLELING THE GENERATOR, IS PRODUCED ONLY WHEN A PREDETERMINED RELATION EXISTS BETWEEN THE AC WAVEFORMS.
Inventors
- 👤 Richard E Luebrecht
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |