US3569651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit breaker having pressurized liquified gas continuously maintained above instantaneous vapor pressure
Assignee: Individual
•
Filing: 1969-10-20
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Granted: 1971-03-09
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Expires: 1989-10-20
Abstract
Abstract A circuit breaker having a circuit interrupting chamber containing a liquefied dielectric gas with a fixed contact member disposed so as to lie in the liquefied gas and a movable contact member disposed in the chamber so as to have its contact making surface within the liquefied gas for all of its positions relative to the fixed contact, and having means, such as a hydraulic accumulator or a compressed gas compartment communicating with the circuit interrupting chamber; i.e., other than the gaseous phase of the liquefied dielectric gas for continuously maintaining the liquid pressure above the critical pressure of the dielectric gas.
Inventors
- 👤 Jean Louis Gratzmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:56
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02; H01H33/28; H01H33/30; H01H33/34; H01H33/04; H01H33/22; H01H33/008
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A circuit breaker comprising a circuit interrupting chamber containing a liquefied dielectric gas, a fixed contact member disposed in said chamber so as to lie within said liquefied gas, a movable contact member disposed in said chamber so as to be in the liquefied gas for all of its positions relative to the fixed contact member, and pressurizing means for continuously maintaining the liquefied gas under a pressure higher than the instantaneous vapor pressure of the liquefied dielectric gas, whereby all of said liquified gas is constantly maintained in its liquid state.
Claim 2
Dependent Claim
92 words
A circuit breaker comprising a circuit interrupting chamber containing a liquefied dielectric gas, a fixed contact member disposed in said chamber so as to lie within said liquefied gas, a movable contact member disposed in said chamber so as to be in the liquefied gas for all of its positions relative to the fixed contact member, and pressurizing means for continuously maintaining the liquefied gas under a pressure higher than the instantaneous vapor pressure of the liquefied dielectric gas, whereby all of said liquified gas is constantly maintained in its liquid state.
Claim 3
Dependent Claim
19 words
A circuit breaker as set forth in claim 1 wherein the said liquefied dielectric gas is sulfur hexafluoride SF6.
Claim 4
Dependent Claim
22 words
A circuit breaker according to claim 1, in which said pressure is continuously maintained above the critical pressure of said liquefied gas.
Claim 5
Dependent Claim
21 words
A circuit breaker as set forth in claim 1, wherein the said liquefied dielectric gas is a perhalogenated hydrocarbon or flugene.
Claim 6
Dependent Claim
53 words
A circuit breaker as set forth in claim 1, in which said circuit interrupting chamber is hydraulically connected to the liquid compartment of a hydraulic accumulator, defining said pressurizing means, the compartment being filled with liquefied dielectric gas which is kept liquid by the pressure applied by the resilient means of the accumulator.
Claim 7
Dependent Claim
33 words
A circuit breaker as set forth in claim 5, wherein the hydraulic accumulator is at earth potential and the hydraulic connection between the circuit interrupting chamber and the accumulator is an insulated duct.
Claim 8
Dependent Claim
54 words
A circuit breaker as set forth in claim 5, wherein the resilient means for pressurizing the accumulator take the form of a pressurized gas contained in the second compartment of the accumulator, the liquefaction pressure of the latter gas being considerably greater than the liquefaction pressure of the liquefied dielectric gas at equal temperatures.
Claim 9
Dependent Claim
88 words
A circuit breaker as set forth in claim 5, wherein the hydraulic communication between the liquid compartment of the accumulator and the circuit interrupting chamber includes a nonreturn valve inhibiting liquid flow from the chamber to the accumulator; and a draining and flow duct connects the top part of the circuit interrupting chamber to the liquid compartment of the accumulator and also has a nonreturn valve inhibiting flow from the accumulator to the circuit interrupting chamber, so that the fluid can flow in closed circuit but only unidirectionally.
Claim 10
Dependent Claim
53 words
A circuit breaker as set forth in claim 8, wherein the draining duct comprises a changeover means for selectively connecting the circuit interrupting chamber either- the normal case- to the liquid compartment of the accumulator or to atmosphere, when it is required to purge the chamber of gases other than the dielectric gas.
Claim 11
Dependent Claim
59 words
A circuit breaker as set forth in claim 1, wherein the circuit interrupting chamber is disposed at the top of an insulated column with insulating liquid, and wherein the circuit interrupting chamber and the internal space of the column are filled with said liquefied dielectric gas, the circuit interrupting chamber and the inside space of the column being intercommunicating.
Claim 12
Dependent Claim
70 words
A circuit breaker as set forth in claim 1, wherein said pressurizing means comprises, above the circuit inTerrupting chamber containing the liquid dielectric, a compartment filled with a compressed gas, such as nitrogen, whose liquefaction pressure is appreciably greater than the liquefaction pressure of the liquefied dielectric gas at equal temperatures, the compressed gas forming a resilient cushion for pressurizing the liquefied dielectric gas contained in the circuit interrupting chamber.
References Cited (Backward Citations)
GB609589A
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US3150245A
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DE1143890B
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DE1164536B
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FR1281324A
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FR1349314A
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |