US3406269A - Fluid-blast circuit breakers having means for increasing the density of the fluid during interruption - Google Patents

Fluid-blast circuit breakers having means for increasing the density of the fluid during interruption Download PDF

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Publication number
US3406269A
US3406269A US435563A US43556365A US3406269A US 3406269 A US3406269 A US 3406269A US 435563 A US435563 A US 435563A US 43556365 A US43556365 A US 43556365A US 3406269 A US3406269 A US 3406269A
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Prior art keywords
interrupting
density
pressure
medium
chamber
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US435563A
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English (en)
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William H Fischer
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CBS Corp
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Westinghouse Electric Corp
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Priority to US435563A priority Critical patent/US3406269A/en
Priority to DE19661615019 priority patent/DE1615019A1/de
Priority to AT48266A priority patent/AT262432B/de
Priority to CH186466A priority patent/CH446477A/de
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Publication of US3406269A publication Critical patent/US3406269A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/22—Selection of fluids for arc-extinguishing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/91—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism the arc-extinguishing fluid being air or gas
    • H01H2033/912—Liquified gases, e.g. liquified SF6

Definitions

  • ABSTRACTOFYIHE-DISCLOSUREp A gas-blast type of circuit interrupter using an elect'ron'egative arc-extinguishing gas or liquid'increass the densityof the fluid along the established are path by'injector means or piston meaus, andhence the arc voltage at the time ofinterruption.
  • This invention relates, generally, to circuit breakers, and, more particularly, to circuit breakers utilizing an interrupting medium having an electronegative characteristic.
  • SP sulfur hexafluoride
  • An efficie'nt circuit interrupter should have the most dense and un-ionized SP possible along the entire length of the interrupting break.
  • the more molecules ofSF there are present at the arc the greater will be the capacity of the interrupter to absorb electrons and the faster will be the de-ionization process at current zero.
  • the difference in performance between liquid and gas SF interrupters illustrates this point;
  • the liquid breaker contains SP at a higher density. Because'of this, the size of the interrupter, and hence the breaker, can be made considerably smaller when liquid SP is utilized as the interrupting medium.
  • An object of this invention is to provide for utilizing a high density electronegative interrupting medium in circuit breakers of a gas, liquid, or gas and liquidtype.
  • Another object of the invention is to eliminate the need for resistance heaters in high pressure SF breakers.
  • a further object of the invention is to provide a circuit breaker having a tank which is small enough in diameter to be exempt from the ASME Boiler and Pressure Vessel Code.
  • Still another object of the invention is to increase and control thepressure in a circuit breaker containing an electronegative interrupting medium.
  • -A still further object of the invention is to provide for raising the pressure and the density of the interrupting medium to the required value only at the time of interruption.
  • Another object of the invention is to utilize the injector principle to improve the performance of circuit breaker interrupters containing an electronegative interrupting medium.
  • the injector principle is utilized to maintain high' density un-ionized SP along the entire length of an interrupting break, thereby improving the performance of the interrupter.
  • high densityof the SP is maintained by means of an accumulator connected to the'ta'nk of a breaker containing liquid SP The accumulator prevents an excessive rise in the pressure during an interruption.
  • FIGURES 1, 2, 3 and4 are diagrammatic'views of circuit interrupters embodying features of the inveniton for maintaining high density of an interrupting medium, such hereinafter or will be apparent to those skilled in the art;
  • FIGS. 5 and 6 are diagrammatic views of interrupters having means for maintaining high pressure and density of liquid SP
  • the structure shown diagrammatically therein comprises a generally cylindrical housing or tank 11 having an interrupting chamber 12 disposedinside the tank 11.
  • the tank contains an electronegative interrupting medium, such as sulfur hexafluoride (SF which is normally in a gaseous state.
  • SF sulfur hexafluoride
  • the vapor pressure of SP is such that at pressures above 60 p.s.i. it begins to condense out at moderately low temperatures.
  • a collector 13 is provided at the bottom of the tank 11 to collect the liquid SP that condenses from the gaseous SP
  • a relatively stationary contact member 14 and a movable contact member 15 are disposed inside the interrupting chamber 12 when in their closed position.
  • the movable contact member 15 may be separated from the stationary contact member 14 to draw an are 16 therebetween in the interrupting medium.
  • the contact member 15 may be actuated by a cross member 17 connected between two spaced operating rods 18 which may be moved longitudinally by a suitable operating mechanism (not shown), such as, for example, the one described in-a copending. application, Ser. No. 61,284, filed Oct. 7, 1960, now United States Patent 3,154,658, issued Oct. 27, 1964 to R. G. Colclaser and R. N. Yeckley and assigned to the Westinghouse Electric Corporation.
  • a putter mechanism 21 is provided to create a blast of the interrupting medium through an orifice 22 in the interrupting chamber 12.
  • the orifice 22 is formed by a liner 23 which is preferably composed of polytetrafiuoroethylene which is sold under the trade name Teflon.
  • the puffer 21 includes a piston 24 which is slidably disposed inside the cylindrical interrupting chamber 12.
  • a bushing 25 surrounds the stationary contact member 14 where it passes through the head of the piston 24.
  • the piston is actuated by the operating rods 18 the ends of which are attached to the piston.
  • the density of the gas is reduced.
  • the reduction of the density of the SP lessens its interrupting ability.
  • the well-known injector principle is utilized to introduce some of the liquid SE, in the collector 13 into the interrupting chamber.
  • openings 26 are provided in the orifice member 23.
  • a tube or pipe 27 having its lower end disposed in the collector 13 is thus, the high velocity of the gas forced through the orifice 22 by the putter mechanism 21 causes some of the liquid SP to be drawn up from the collector 13 and into the orifice in a manner similar to the operation of an atomizer. In this manner, the density of the interrupting medium along the interrupting break in the chamber 12 is increased, thereby improving the interrupting ability of the medium.
  • FIG. 2 The structure shown in FIG. 2 is in general similar to that shown in FIG. 1.
  • a storage tank 28 contains some of the interrupting medium, such as SP at a high pressure.
  • a blast valve 29, which is opened in conjunction with the separation of the contact members, admits high pressure gas from the tank 28 into the interrupting chamber 12.
  • the valve 29 may be operated by a ratchet mechanism 30 which is operated by the operating mechanism for the movable contact member 15.
  • the ratchet mechanism 30 may be of the type described in a copending application Ser. No. 102,176, filed Apr. 11, 1961 now U.S. Patent 3,214,545, issued Oct. 26, 1965 to C. F. Cromer and assigned to the Westinghouse Electric Corporation.
  • the collector 13 is a closed vessel and a check valve 31 is provided at the entrance to the collector.
  • An additional opening 32 is provided in the orifice member 23 and connected to the collector 13 by means of a tube 33.
  • the interrupter shown in FIG. 3 is of the self-generating type.
  • an intermediate contact member 35 is provided in addition to the fixed contact member 14 and the movable contact member 15.
  • the member 35 is slidably mounted in a partition 36 in the interrupting chamber 12.
  • the member 35 is biasedupwardly by a compression spring 37.
  • the contact member 35 is first separated from the contact member 14, thereby establishing a pressure generating are 38 between these contact members.
  • the heat of the arc 38 vaporizes some of the liquid SP at the bottom of the tank 11 and creates a pressure which causes the vaporized gas to flow through openings 39 in the partition 36 into the upper part of the interrupting chamber 12, where the arc 16 is drawn between the contact member 35 and the contact member 15.
  • the upward travel of the contact member 35 is limited by-a pin or flange 41 which engages the partition 36.
  • a check valve 31 at the entrance to the collector compartment is closed by the increase in pressure in the compartment.
  • the density of the interrupting medium in the interrupting chamber is increased during the interrupting operatiomas previously explained.
  • the interrupter shown in FIG. 4 is also of the selfgenerating type. In this case, it is assumed that the interrupting medium in the tank 11' remains in a gaseous state under the operating conditions encountered by the breaker. Since the gas forced through the orifice 22 by the pressure generating are 38 is relatively hot and ionized, it is desirable to mix un-ionized gas with the ionized gas in the interrupting chamber. This is accomplished by utilizing the injector principle. As shown, openings 45 are provided in the orifice member 23'. Thus, the velocity of the gas flowing through the orifice past the openings 45 draws un-ionized gas from outside the interrupting chamber 12 through the openings 45 into the chamber where it assists in extinguishing the main are 16. I One of the reasons SP breaker tanks are expensive is the requirement of adhering to the ASME Boiler and Pressure Vessel Codes. The code rules not only add to the initial cost of thebreaker, but for most designs reconnected to the openings'26.
  • circuit breakers can be provided which are smaller and cheaper than prior breakers.
  • the circuit breaker shown in FIG. 5 is of the self-contained type. It comprises a generally cylindrical interrupti'ng chamber 46 which is of a diameter of six inches or less.
  • the chamber 46 contains liquid SP A stationary contact member 47 enters one end of the chamber through an insulating bushing 48.
  • a conductor 49 enters the chamber through a similar bushing 51, which is mounted at the other end of the chamber and at right angles to the bushing 48.
  • the upper end of the conductor 49 is provided with contact fingers 52 which support and engage a movable contact member 53.
  • the contact member 53 may be actuated by any suitable operating means, such as a solenoid having a coil 54 and a core 55, which is attached to one end of the contact member 53 by an insulating member 56.
  • the core 55 is disposed inside an extension 50 of the chamber 46.
  • a generally cylindrical accumulator 57 has a closed end 58 and an open end which is connected to the interrupting chamber 46 at 59.
  • a floating piston 61 is disposed inside the accumulator 57.
  • the piston 61 divides the accumulator into two chambers or compartments one of which contains liquid SP and the other of which contains an inert gas, such as nitrogen, at a relatively high pressure, for example 2,000 p.s.i.
  • an inert gas such as nitrogen
  • Other compressible means such as a spring, could be utilized to apply pressure on the piston 61.
  • the nitrogen in the accumulator may be compressed slightly by the initial interrupting shock.
  • the resiliency of the compressed gas continues to force the piston 61 in the direction to maintain high pressure and high density of the interrupting medium in the interrupting chamber, thereby improving the interrupting abilit of the interrupter.
  • the breaker shown in FIG. 6 is in general similar to the one shown in FIG. 5.
  • the accumulator 57 has a piston 62 therein which is connected to a suitable actuating means (not shown) by a connecting rod 63.
  • the actuating means may be of a type well known in the art such as, for example, a hydraulic mechanism or a spring operated mechanism.
  • An operating piston 64 is disposed inside a cylinder 65 which is connected to the end of the interrupting chamber 46 opposite the end having the bushing 48 therein.
  • the piston 64 is attached directly to the movable contact member 53.
  • a compression spring 66 is disposed in the cylinder 65 between the piston 64 and the closed end of the cylinder.
  • Other compressible means such as air or a gas, may be utilized in place of the spring 66.
  • the contact members are shown in the closed position.
  • the piston 62 in the accumulator 57 is driven to the left by the external actuating mechanism. This forces additional liquid SP into the interrupting chamber, thereby increasing the pressure in the chamber.
  • the increase in pressure forces the piston 64 to the left, thereby opening the contact members. It will be noted that the increase in pressure and density of the SP occurs only at the time of interruption, thereby improving the interrupting ability of the interrupter.
  • the piston 62 is moved to the right by the actuating mechanism, thereby decreasing the pressure in the interrupting chamber 46 and permitting the spring 66 to drive the piston 64 to the right to close the contact mem bers.
  • SP or other media is utilized at a pressure and density higher than that obtained at room temperature vapor pressure.
  • the room temperature (70 F.) vapor pressure of SP is 300 p.s.i.g.
  • the density is 12.5 pounds per cu. ft. at this pressure and temperature. In the present case the density is higher than 12.5 pound per cu. ft. for SP
  • the interrupting medium is utilized at extra high density.
  • the are voltage has the same effect as an increasing series variable resistor.
  • the high arc voltage reduces the magnitude and rate of rise of recovery voltage. This provides more time to recover the needed dielectric strength.
  • Pressure rise is directly proportional to arcing time, current and arc voltage, and inversely proportional to SP and nitrogen volume.
  • SP is referred to and described is referred to and described herein because of its excellent properties, but other media such as selenium hexafluoride SeF or trifluoromethyl sulfur pentafiuoride CF SF perfiuoro propane C F perfluoro butane C 1 sulfur monofiuoride S F sulfurylfiuoride SO F perchlorylfluoride ClO F, perfiuorobromomethane CF Br, could be utilized.
  • media such as selenium hexafluoride SeF or trifluoromethyl sulfur pentafiuoride CF SF perfiuoro propane C F perfluoro butane C 1 sulfur monofiuoride S F sulfurylfiuoride SO F perchlorylfluoride ClO F, perfiuorobromomethane CF Br, could be utilized.
  • a circuit breaker in combination, an interrupting chamber, separable contact members disposed within the interrupting chamber, a tank surrounding the interrupting chamber, a collector disposed at the bottom of the tank, an electronegative gaseous interrupting medium surrounding the separable contact members, the pressure and temperature conditions within the tank being such as to cause a liquefaction of a portion of said gaseous medium into said collector (13), said contact members being separable to draw an arc in the gaseous interrupting medium, means for creating a blast of the gaseous medium through the interrupting chamber and for introducing a quantity of the liquefied medium from the collector into the interrupting chamber to increase the density of the medium in the interrupting chamber and to extinguish the arc.
  • circuit breaker combination of claim 1 wherein the arc is drawn through an insulating orifice member, and the blast of gaseous medium occurs through said insulating orifice member.
  • the blast-creating means includes a storage tank (28) containing the eleotronegative gaseous interrupting medium at high-pressure and controlled by a blast valve (29) to force said gaseous interrupting medium at high pressure through the arc.
  • blastcreatin g means includes a storage tank (28) containing the electronegative gaseous interrupting medium at highpressure and controlled by a blast valve (29) to force said gaseous interrupting medium at high pressure through the arc.
  • electronegative gaseous interrupting medium is selected from the group consisting of SF SeF SO F CF SF ClO F, C3F3, S2F2, C4F10 and CF3BI'.
  • a metallic cylindrical interrupting chamber of 6 inches or less containing only a liquid electronegative interrupting medium separable contact members disposed inside the chamber, terminal bushings for supporting the separable contact members, an accumulator connected to the chamber and containing the same kind of liquid, a piston (62) inside the accumulator, means (63) acting on the piston (62) to force liquid from the accumulator into the chamber to increase the pressure and the density of the liquid in the chamber, and piston means (64) for separating the contact members to draw an arc in the interrupting medium.

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US435563A 1965-02-26 1965-02-26 Fluid-blast circuit breakers having means for increasing the density of the fluid during interruption Expired - Lifetime US3406269A (en)

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US435563A US3406269A (en) 1965-02-26 1965-02-26 Fluid-blast circuit breakers having means for increasing the density of the fluid during interruption
DE19661615019 DE1615019A1 (de) 1965-02-26 1966-01-10 Druckgasschalter
AT48266A AT262432B (de) 1965-02-26 1966-01-19 Leistungsschalter
CH186466A CH446477A (de) 1965-02-26 1966-02-10 Leistungsschalter

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531609A (en) * 1966-04-15 1970-09-29 Jean Louis Gratzmuller Electrical circuit breaker
US3842227A (en) * 1971-09-30 1974-10-15 J Gratzmuller Circuit-breaker having dielectric liquid under pressure
US3846602A (en) * 1971-10-05 1974-11-05 Siemens Ag Dual-pressure high-voltage compressed-gas insulated electric circuit breaker
US3946180A (en) * 1974-04-22 1976-03-23 I-T-E Imperial Corporation Downstream injection nozzle for puffer circuit interrupter
US4079219A (en) * 1975-08-29 1978-03-14 I-T-E Imperial Corporation SF 6 Puffer for arc spinner
EP0020805A1 (de) * 1979-06-25 1981-01-07 Westinghouse Electric Corporation Leistungsschalter
US4268733A (en) * 1977-10-19 1981-05-19 Gould Inc. Liquid SF6 puffer type circuit interrupter
US4273978A (en) * 1978-06-09 1981-06-16 Electric Power Research Institute, Inc. Liquid interrupter module
US4288668A (en) * 1977-08-22 1981-09-08 Electric Power Research Institute, Inc. Circuit interrupter using a minimum of dielectric liquid
US4307274A (en) * 1977-07-22 1981-12-22 Electric Power Research Institute, Inc. Circuit interrupter using dielectric liquid with energy storage
US4562322A (en) * 1981-06-03 1985-12-31 Hitachi, Ltd. SF6 Gas arc extinguishing electric apparatus and process for producing the same
FR2582145A1 (fr) * 1985-05-15 1986-11-21 Alsthom Disjoncteur a hexafluorure de soufre fonctionnant dans un environnement a tres basse temperature
EP0204180A1 (de) * 1985-05-15 1986-12-10 Alsthom Schalter mit Schwefelhexafluorid, funktionierend in einer Umgebung bei sehr niedriger Temperatur
FR2585875A2 (fr) * 1985-05-15 1987-02-06 Alsthom Disjoncteur a hexafluorure de soufre fonctionnant dans un environnement a tres basse temperature
FR2586136A1 (fr) * 1985-08-09 1987-02-13 Alsthom Disjoncteur a hexafluorure de soufre a haute densite
FR2594255A2 (fr) * 1985-05-15 1987-08-14 Alsthom Disjoncteur a hexafluorure de soufre fonctionnant dans un environnement a tres basse temperature.
FR2602088A1 (fr) * 1986-07-23 1988-01-29 Hydro Quebec Disjoncteur a auto-soufflage et auto-injection de son gaz liquefie
US20140083737A1 (en) * 2011-05-24 2014-03-27 Schneider Electric Industries Sas Electrical apparatus having a gas insulation containing a fluorinated compound

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE638145C (de) * 1934-02-15 1936-11-10 Voigt & Haeffner Akt Ges Fluessigkeitsschalter
GB475370A (en) * 1936-06-12 1937-11-18 Gen Electric Co Ltd Improvements in or relating to alternating current electric switches
DE679327C (de) * 1934-12-02 1939-08-05 Voigt & Haeffner Akt Ges Fluessigkeitsschalter
DE703744C (de) * 1930-09-11 1941-03-15 Frida Strauss Geb Ruppel Fluessigkeitsschalter
GB609589A (en) * 1945-03-23 1948-10-04 Westinghouse Electric Int Co Improvements in or relating to fluid blast electric circuit interrupters
US2757261A (en) * 1951-07-19 1956-07-31 Westinghouse Electric Corp Circuit interrupters
US3150245A (en) * 1957-09-13 1964-09-22 Westinghouse Electric Corp Liquefied gas circuit interrupters
US3257533A (en) * 1965-04-23 1966-06-21 Westinghouse Electric Corp Fluid-blast circuit interrupters with two selectively-operated fluid-blast sources

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE703744C (de) * 1930-09-11 1941-03-15 Frida Strauss Geb Ruppel Fluessigkeitsschalter
DE638145C (de) * 1934-02-15 1936-11-10 Voigt & Haeffner Akt Ges Fluessigkeitsschalter
DE679327C (de) * 1934-12-02 1939-08-05 Voigt & Haeffner Akt Ges Fluessigkeitsschalter
GB475370A (en) * 1936-06-12 1937-11-18 Gen Electric Co Ltd Improvements in or relating to alternating current electric switches
GB609589A (en) * 1945-03-23 1948-10-04 Westinghouse Electric Int Co Improvements in or relating to fluid blast electric circuit interrupters
US2757261A (en) * 1951-07-19 1956-07-31 Westinghouse Electric Corp Circuit interrupters
US3150245A (en) * 1957-09-13 1964-09-22 Westinghouse Electric Corp Liquefied gas circuit interrupters
US3257533A (en) * 1965-04-23 1966-06-21 Westinghouse Electric Corp Fluid-blast circuit interrupters with two selectively-operated fluid-blast sources

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531609A (en) * 1966-04-15 1970-09-29 Jean Louis Gratzmuller Electrical circuit breaker
US3842227A (en) * 1971-09-30 1974-10-15 J Gratzmuller Circuit-breaker having dielectric liquid under pressure
US3846602A (en) * 1971-10-05 1974-11-05 Siemens Ag Dual-pressure high-voltage compressed-gas insulated electric circuit breaker
US3946180A (en) * 1974-04-22 1976-03-23 I-T-E Imperial Corporation Downstream injection nozzle for puffer circuit interrupter
US4079219A (en) * 1975-08-29 1978-03-14 I-T-E Imperial Corporation SF 6 Puffer for arc spinner
US4307274A (en) * 1977-07-22 1981-12-22 Electric Power Research Institute, Inc. Circuit interrupter using dielectric liquid with energy storage
US4288668A (en) * 1977-08-22 1981-09-08 Electric Power Research Institute, Inc. Circuit interrupter using a minimum of dielectric liquid
US4268733A (en) * 1977-10-19 1981-05-19 Gould Inc. Liquid SF6 puffer type circuit interrupter
US4273978A (en) * 1978-06-09 1981-06-16 Electric Power Research Institute, Inc. Liquid interrupter module
EP0020805A1 (de) * 1979-06-25 1981-01-07 Westinghouse Electric Corporation Leistungsschalter
US4562322A (en) * 1981-06-03 1985-12-31 Hitachi, Ltd. SF6 Gas arc extinguishing electric apparatus and process for producing the same
FR2582145A1 (fr) * 1985-05-15 1986-11-21 Alsthom Disjoncteur a hexafluorure de soufre fonctionnant dans un environnement a tres basse temperature
EP0204180A1 (de) * 1985-05-15 1986-12-10 Alsthom Schalter mit Schwefelhexafluorid, funktionierend in einer Umgebung bei sehr niedriger Temperatur
FR2585875A2 (fr) * 1985-05-15 1987-02-06 Alsthom Disjoncteur a hexafluorure de soufre fonctionnant dans un environnement a tres basse temperature
FR2594255A2 (fr) * 1985-05-15 1987-08-14 Alsthom Disjoncteur a hexafluorure de soufre fonctionnant dans un environnement a tres basse temperature.
FR2586136A1 (fr) * 1985-08-09 1987-02-13 Alsthom Disjoncteur a hexafluorure de soufre a haute densite
FR2602088A1 (fr) * 1986-07-23 1988-01-29 Hydro Quebec Disjoncteur a auto-soufflage et auto-injection de son gaz liquefie
US4736080A (en) * 1986-07-23 1988-04-05 Hydro-Quebec Puffer type liquefied-gas self-injection circuit breaker
US20140083737A1 (en) * 2011-05-24 2014-03-27 Schneider Electric Industries Sas Electrical apparatus having a gas insulation containing a fluorinated compound
US9455562B2 (en) * 2011-05-24 2016-09-27 Schneider Electric Industries Sas Electrical apparatus having a gas insulation containing a fluorinated compound

Also Published As

Publication number Publication date
DE1615019A1 (de) 1970-06-18
AT262432B (de) 1968-06-10
CH446477A (de) 1967-11-15

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