Electric circuit breaker with hydraulic actuating means including a plurality of valves for opening the breaker,and a plurality of valves for closing the breaker
Abstract
Abstract AN ELECTRIC CIRCUIT BREAKER IS DISCLOSED HAVING A BLAST PISTON FOR COMPRESSING A GASEOUS QUENCHING MEDIUM SUCH AS SULFUR HEXAFLOURIDE, AND A HYDRAULIC DRIVE FOR THE BREAKER WHICH INCLUDES A MAIN HYDRAULIC ACTUATOR CYLINDER AND PISTON AND VALVES FOR CONTROLLING THE ADMISSION OF HYDRAULIC FLUID INTO THE CYLINDER. IN ADDITION, FOR CLOSING THE CIRCUIT BREAKER A HYDRAULIC LATCHING ARRANGEMENT IS DISCLOSED WHICH IS ASSOCIATED WITH THE VALVE CLOSEST TO THE MAIN ACTUATOR CYLINDER IN AN APPLICATION WHERE THERE ARE MORE THAN TWO SERIES-CONNECTED VALVES FOR CLOSING THE BREAKER. FOR OPENING THE BREAKER, A HYDRAULIC LATCHING ARRANGEMENT IS DISCLOSED WHICH IS ASSOCIATED WITH A VALVE WHICH IS SEPARATED FROM THE MAIN ACTUATOR CYLINDER BY AT LEAST ONE FURTHER VALVE. D R A W I N G
Inventors
- 👤 G Grieger
- 👤 J Bohrdt
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |