US3614355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sf{11 {0 system with constant density and constant pressure differential maintaining means for a high-voltage switchgear
Assignee: COQ NV
•
Filing: 1969-04-14
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Granted: 1971-10-19
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Expires: 1989-04-14
Abstract
Abstract Metal clad switch gear for high voltages comprising switches and accessories, low-overpressure and high-overpressure compartments filled with SF6-gas and a gas-controlsystem controlling the flow of gas to and from said compartments and keeping both the pressure difference between said compartments and the density of the SF6-gas in the low-overpressure compartment(s) substantially constant.
Inventors
- 👤 Rintje Boersma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:14
CPC Classifications
H; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/055; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/885; H01; H01H; H01H33/00; H01H33/02; H01H33/53; H01H33/56; H01H33/562
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
A switchgear system for high voltage electrical circuits, comprising in combination; an electrically conductive envelope housing at least a gas blast circuit breaker and related portions of a high voltage electrical circuit, said envelope being adapted for connection to earth and defining low-pressure and high-pressure compartments of fixed volumes, said low pressure compartment being filled with an amount of gaseous sulfur hexafluoride sufficient to establish a relatively low pressure in such compartment which will insulate live parts of the switchgear from earth, and said high-pressure compartment being filled with an amount of gaseous sulfur hexafluoride sufficient to establish a relatively high pressure in such compartment which is capable of extinguishing a switching arc caused by operation of said circuit breaker; means for maintaining a substantially constant density of gas in said low-pressure compartment whereby the low-pressure compartment is subjected to limited gas pressure variation in response to temperature variations; and means for varying the density of the gas in said high-pressure compartment to maintain a substantially constant gas pressure differential between said high-pressure and low-pressure compartments.
Claim 2
Dependent Claim
176 words
A switchgear system for high voltage electrical circuits, comprising in combination; an electrically conductive envelope housing at least a gas blast circuit breaker and related portions of a high voltage electrical circuit, said envelope being adapted for connection to earth and defining low-pressure and high-pressure compartments of fixed volumes, said low pressure compartment being filled with an amount of gaseous sulfur hexafluoride sufficient to establish a relatively low pressure in such compartment which will insulate live parts of the switchgear from earth, and said high-pressure compartment being filled with an amount of gaseous sulfur hexafluoride sufficient to establish a relatively high pressure in such compartment which is capable of extinguishing a switching arc caused by operation of said circuit breaker; means for maintaining a substantially constant density of gas in said low-pressure compartment whereby the low-pressure compartment is subjected to limited gas pressure variation in response to temperature variations; and means for varying the density of the gas in said high-pressure compartment to maintain a substantially constant gas pressure differential between said high-pressure and low-pressure compartments.
Claim 3
Dependent Claim
190 words
Metal clad switchgear as claimed in claim 1 wherein said means for maintaining a substantially constant density of gas in said low-pressure compartment comprises a discharge conduit (32) and a supply conduit (29), said conduits (32, 29) being connected to the low-pressure compartment (14) and cooperating with flow regulating means (45, 31, 28) acting on the density of the gas in said compartment (14), said flow regulating means ensuring that gas flows from and to the low-pressure compartment (14) when the density of the gas in said compartment (14) becomes higher and lower than the required density, respectively, said means for varying the density of the gas in said high-pressure compartment comprising a conduit (33) provided with a valve (34) and a conduit (35) provided with a compressor (36), said conduits being connected between the low-pressure compartment (14) and the high-pressure comparTment (2), and a differential-pressure relay (48, 49, 50) connected to both compartments (2, 14) and either opening said valve (34) or starting said compressor (36), when the pressure difference between both compartments (2, 14) becomes higher or lower than the required pressure difference, respectively (FIGS. 2, 3, 4).
Claim 4
Dependent Claim
149 words
Metal clad switchgear as claimed in claim 2, comprising a check valve (55) closing towards the low-pressure compartment (14) and being provided in the discharge conduit (32) which is connected to a low-pressure storage tank (54), the supply conduit (29) being connected through a valve (28) to a high-pressure storage tank (60), a conduit (58) provided with a second compressor (59) being connected between both storage tanks (54, 60), a relay (45) acting on the density of the gas in the low-pressure compartment (14) and adapted to open and to close said valve (28) when the density of the gas in the low-pressure compartment 14 becomes a given value lower than or becomes equal to the required density, respectively, and means (63, 65) for starting the second compressor (59), when the low-pressure storage tank (54) contains too much gas at the temperature obtaining in said tank (FIG. 3, 4).
Claim 5
Dependent Claim
94 words
Metal clad switchgear as claimed in claim 3, in which the relay (45) acting on the density of the gas in the low-pressure compartment (14) starts and stops the second compressor (59) when the density of the gas in said compartment (14) becomes higher or a given value lower than the required density, respectively, a differential-pressure relay (63) being provided which is connected both to the low-pressure compartment (14) and the low-pressure storage tank (54) and is adapted to start the second compressor (59), when the pressure in the low-pressure compartment (14) (FIG. 3).
Claim 6
Dependent Claim
135 words
Metal clad switchgear as claimed in claim 3, comprising also a relay (65) acting on the density of the gas in the low-pressure storage tank (54), said relay starting and stopping the second compressor (59) at density values which are so much higher than the density values, at which the relay (45) acting on the density of the gas in the lower-pressure compartment (14) closes and opens the valve (28), that at the maximum temperature difference to be expected between the gas in the lower-pressure compartment (14) and the gas in the lower-pressure storage tank (54) the second compressor (59) is started at a higher gas pressure than that, at which the valve (28) is closed, and is stopped at a higher gas pressure than that, at which the valve (28) is opened (FIG. 4).
Claim 7
Dependent Claim
81 words
Metal clad switchgear as claimed in claim 3, comprising a gas blast circuit breaker provided with an expansion tank (15) to collect the used extinguishing gas, said expansion tank (15) communicating with the low-pressure storage tank (54) through a conduit (37) provided with a check valve (56) closing towards said tank and a filter (38), said expansion tank (15) also communicating with the low-pressure compartment (14) through a conduit (39) provided with a check valve (40) closing towards said compartment (14).
Claim 8
Dependent Claim
38 words
Metal clad switchgear as claimed in claim 6, comprising a buffer tank (57) provided between the check valve (56) and the filter (38) in the conduit (37) extending between the expansion-tank (15) and the low-pressure storage tank (54).
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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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |