US3060294A - Circuit interrupter - Google Patents

Circuit interrupter Download PDF

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Publication number
US3060294A
US3060294A US693306A US69330657A US3060294A US 3060294 A US3060294 A US 3060294A US 693306 A US693306 A US 693306A US 69330657 A US69330657 A US 69330657A US 3060294 A US3060294 A US 3060294A
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United States
Prior art keywords
hydraulic
pressure
gas
movable
conduit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US693306A
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English (en)
Inventor
Winthrop M Leeds
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US693306A priority Critical patent/US3060294A/en
Priority to DEW24273A priority patent/DE1188173B/de
Priority to DE1958W0020684 priority patent/DE1833262U/de
Priority to CH6531358A priority patent/CH366316A/de
Priority to GB33936/58A priority patent/GB860245A/en
Priority to FR1214299D priority patent/FR1214299A/fr
Application granted granted Critical
Publication of US3060294A publication Critical patent/US3060294A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
    • 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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic
    • 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
    • H01H33/008—Pedestal mounted switch gear combinations

Definitions

  • Another object of the invention is to provide an improved hydraulic operating mechanism for a pair of serially related arc-extinguishing units, in which the operation of the two movable contact structures is synchronized mechanically so that assurance may be had that both arc-extinguishing units are operating in a satisfactory manner by opening and closing substantially simultaneously.
  • Still a further object of the invention is to provide an improved hydraulic operating mechanism for a circuit interrupter utilizing arc-extinguishing units, each of which effects the compression of gas, in which an improved seal is provided to prevent the contamination of the hydraulic operating fluid with the arc-extinguishing gas.
  • Another object of the invention is to provide an improved circuit interrupter utilizing a pair of serially related arc-extinguishing units in which an improved indicator devce is employed to positively indicate the open and closed-circuit positions of the movable contact.
  • a further object of the invention is to provide an improved circuit interrupter in which the one or more arcextinguishing units are supported upon an upwardly extending insulating pedestal serving as a gas reservoir chamber, in which the interior of the insulating reservoir pedestal is hollow and filled with a compressed gas of relatively high dielectric strength.
  • Yet a further object of the invention is to provide an improved circuit interrupter of the type specified in the immediately preceding paragraph, in which the upstanding pedestal in addition serves as a conduit for the arcextinguishing gas to the one or more interrupting chambers.
  • Another object is to provide an improved hydraulic operating mechanism in which gas pressure is employed upon the liquid level in the sump, so that a positive pressure exists at all times in the control line leading from the pilot valve to the main operating valve. This prevents air leakage into the control line by such positive pressure.
  • a further object is to provide an upstanding pedestal gas reservoir for a circuit interrupter in which suitable check valves are employed in the feed lines leading from the pedestal reservoir so that contaminated, arced gas will not be forced under pressure back into the gas reservoir pedestal, and breakage of the pedestal reservoir will not affect the maintenance of gas pressure over the liquid level in the sump.
  • FIG. 1 is a side elevational view of a circuit interrupter embodying the principles of the present invention, with the contact structure being indicated in the closed-circuit position;
  • FIG. 2 is a fragmentary, enlarged, partly diagrammatic, vertical sectional view through a portion of the upper end of the circuit interrupter of FIG. 1, with the contactv structure being likewise shown in the closed-circuit position; and,
  • FIG. 3 is a fragmentary, top plan view of a portion of the circuit interrupter of FIG. 2, with a portion of the intermediate housing broken away to illustrate the indicator mechanism, again the contact structure being indicated in the closed-circuit position.
  • the reference numeral 1 generally designates a circuit interrupter of the type including a pair of laterally extending arc-extinguishing units 2 (FIG. 2), enclosed within horizontally extending weatherproof casings 3, in this particular instance being made of porcelain.
  • the inner ends of the porcelain casings 3 are secured to ring-shaped mounting flanges 4 by cement 5, and, as shown in FIG. 2, the porcelain casings 3 are supported in a horizontal manner, extending laterally outwardly from an intermediate mechanism housing 7.
  • the interior 8 of the intermediate mechanism housing 7 is preferably filled with air at atmospheric pressure.
  • the intermediate mechanism housing 7 is supported at the upper end of an upstanding insulating gas reservoir pedestal 9, more clearly shown in FIG. 1.
  • the pedestal 9 is formed from a suitable Weatherproof material, in this particular instance porcelain.
  • the mechanism compartment 10 may rest upon any suitable base 13.
  • each of the two serially related arc-extinguishing units 2 includes an insulating operating cylinder 14, supported at the end of a hydraulic operating cylinder 15.
  • Reciprocally movable within the operating cylinder 14 is a piston 16 having a laterally jutting orifice portion 17.
  • the piston 16 is carried by a movable contact 18, the latter being disposed at the end of a contact rod 19.
  • a differential piston Located at the inner end of the contact rod 19 is a differential piston, generally designated by the reference numeral 20.
  • a relatively stationary contact 21 Cooperable with the movable contact 18 is. a relatively stationary contact 21, the latter being supported by a conducting closure cap 22.
  • the closure cap 22 may have a terminal stud 23 afiixed thereto, to which may be connected an external line conductor, not shown.
  • the closure cap 22 is secured, by any suitable clamping means, to a ring-shaped mounting flange 24, the latter being affixed, as by cement 25, to the outer end of the porcelain casing 3.
  • a ring-shaped mounting flange 24 the latter being affixed, as by cement 25, to the outer end of the porcelain casing 3.
  • the inner surface of the porcelain casing 3 has intersecting conical, tapered surfaces 26, intersecting at the point 27, for a purpose to be explained hereinafter.
  • Each of the two differential pistons 20 has a rack 28 secured thereto, as shown in FIG. 2, which racks 28 mesh with a pinion gear 29 fixed on a shaft 30, the latter extending outwardly from'the operating cylinder 15 in a manner more clearly illustrated in FIG. 3 of the drawings.
  • the indicator shaft 30 has a Patented Oct. 23, 1962 pinion gear 31 keyed thereto adjacent its outer end, which pinion gear 31 meshes with a larger gear 32, the latter effecting the rotation of a second indicator shaft 33.
  • an indicator pointer 34 Disposed externally of the intermediate mechanism housing 7, at the outer end of the indicator shaft 33, is an indicator pointer 34, the latter indicating the open and closed positions of the interrupter 1, as more clearly shown in FIG. 1 of the drawings.
  • each differential piston 20 is constantly maintained under high pressure, as caused by the presence of a high-pressure operating fluid, such as oil 35, disposed within a pair of opening conduits 36, the latter being connected together and with an enlarged supply conduit 37.
  • a high-pressure operating fluid such as oil 35
  • the upper end of the hydraulic conduit 37 is connected to a high pressure accumulator, generally designated by the reference numeral 38.
  • the high-pressure accumulator 38 includes a reservoir tank 39, within which is situated a movable piston or diaphragm 40 biased downwardly under pressure by a suitable gas, such as nitrogen N disposed under pressure in the region 41 at the upper end of the reservoir tank 39.
  • a suitable gas such as nitrogen N disposed under pressure in the region 41 at the upper end of the reservoir tank 39.
  • the nitrogen is preferably under high pressure, say 2,000 pounds per square inch gauge.
  • the accumulator 38 maintains the hydraulic fluid, such as oil 35, under pres sure of 2,000 p.s.i. within the hydraulic conduits 36, thereby tending to force the differential piston 20 and hence the movable contact rods 19 toward each other in the opening direction.
  • a hydraulic conduit 42 is connected to the hydraulic operating cylinder in back of the differential pistons 20, and since the contact rods 19 move out of the chamber 15, the effective closing area of the pistons. is greater than the effective opening area. Equal pressure conditions on both sides of the differential pistons 20 will, therefore, cause the movable contact structures 18 to remain in the closed-circuit position, as shown in FIG. 2.
  • the lower end of the hydraulic conduit 42 is connected to a main hydraulic valve, generally designated by the reference numeral 44.
  • the main hydraulic valve 44 includes a casing 45, within which reciprocally moves a plunger piston 46, carrying a sleeve valve 47 through a spider 48.
  • the sleeve valve 47 is biased downwardly by a compression biasing spring 49.
  • the sleeve valve 47 has a plurality of, in this particular instance, four openings 50, which connect at all times an annular space 51, within casing 45, with the region 52 within sleeve valve 47.
  • the supply conduit 37 connects with the space 53 within the upper end of the valve casing 45.
  • a drain conduit 54 Connected to the lower end of the valve casing 45 is a drain conduit 54, composed of insulating material and extending downwardly interiorly within the insulating gas reservoir pedestal 9.
  • the lower end of the insulating drain conduit 54 communicates with a sump 55, located at ground potential within the mechanism compartment 10 (FIG. 1).
  • a suitable arc-extinguishing gas such as sulfur hexafluoride SP maintained at a suitable lower pressure, such as 60 p.s.i.
  • the SP at 60 p.s.i. within the region 57 of the sump 55 also communicates by way of conduit 58 and a check valve 58a to the region 59 interiorly of the insulating gas reservoir pedestal 9.
  • the sump 55 is also connected by a conduit 60 through a filter 61 to a compressor pump 62.
  • the oil 35 may thus be pumped to a high pressure and fed through a conduit 63 upwardly interiorly through pedestal 9 back up into the supply conduit 37, and hence into the highpressure accumulator 38.
  • a pilot valve 64 is provided in a conduit 65 interconnecting high-pressure conduit 63 and the low pressure drain 54. This pilot valve 64 controls the admission of high-pressure hydraulic fluid 35 from the conduit 65 upwardly through a control conduit or operating line 66.
  • the upper end of the control conduit 66 terminates within a space 67 below the plunger piston 46.
  • a drain conduit 68 interconnects the space 69 above the plunger piston 46 with the drain conduit 54.
  • each porcelain casing 3 The regions 70 within each porcelain casing 3 are connected by a conduit 71 through an upstanding feed conduit 72 and through a check valve 73 to the region 59 within hollow gas reservoir pedestal 9.
  • the electrical circuit therethrough includes left-hand terminal stud 23, closure cap '22, stationary contact 21, movable contact 18, movable contact operating rod 19, conducting hydraulic operating cylinder 15 to the other conducting movable contact rod 19 and, in a similar manner, to the other line terminal stud 23, as shown in FIG. 1.
  • the pilot valve 64 When it is desired to effect the opening of the circuit interrupter 1, the pilot valve 64 is operated, either manually or electromagnetically, to thereby permit highpressure hydraulic fluid, such as oil 35, to pass from the high pressure conduit 63, through control conduit 66 to space 67 below plunger piston 46. Since the space 69, above plunger piston 46, is connected by the drain conduit 68 to a relatively low pressure, the plunger piston 46 rapidly moves upwardly against the opposition afforded by biasing spring 49. This will cause the sleeve valve 47 to move upwardly, closing off the inlet region 53 of the main hydraulic Valve 44, and opening the outlet space 74 of main hydraulic valve 44, through conduit 42, with the space 75 on the back sides of the differential pistons 20. Since the space 76 on the front sides of the differential pistons 29 is constantly maintained at high pressure, the pistons 20' will be rapidly moved toward each other by the high-pressure hydraulic fluid 35 to thereby effect the separation of the movable contacts 18 away from the stationary contacts 21.
  • highpressure hydraulic fluid such as oil 35
  • a sealing region 78 which is connected, by a drain pipe 79, to the main drain conduit 54.
  • any high-pressure oil 35 which may leak along the contact rod 19 through the opening 80 within the hydraulic operating cylinder 15, will merely drain downwardly through the drain pipe 79 through drain conduit 54 to the sump 55.
  • the pressure within the sealing region 78 is the same as the pressure within the region 70 within porcelain casing 3 so that, as a result, there will be no tendency for the SP to leak along the contact rod 19 through opening 81 within insulating operating cylinder 14.
  • the pilot valve 64 remains in the position pers,0eo,294.
  • the pilot valve 64 When it is desired to effect the closing of the circuit through the interrupter 1, the pilot valve 64 is manually or electromagnetically operated to its other position, so as to connect the space 67 below plunger piston 46 to the main drain conduit 54.
  • the spring 49, and the force of gravity, will move the plunger piston 46 downwardly, it being apparent that now the pressure within the spaces 67, 69 are equal, as brought about the drain pipe 68.
  • the downward movement of the slide valve 47 will close off the drain region 74 of main hydraulic valve 44 and will open up the inlet high-pressure region 53.
  • highpressure oil 35 will pass through the high-pressure inlet region 53 across the upper end of sleeve Valve 47, through openings 50 and annular space 51, and through conduit 42 to the region 75 in back of the differential pistons 20.
  • any suitable hydraulic fluid may be employed.
  • any suitable arc-extinguishing gas may be utilized.
  • hollow gas reservoir insulating pedestal 9 will improve the voltage-withstanding ability of the porcelain pedestal 9, and, in addition, will permit the pedestal 9 to serve as a conduit from the pipe 58 to the lower end of the feed conduit 72. Moreover, should pressure be lost within pedestal 9, as a result of cracking thereof or leakage, the check valve 73 will prevent the pressure dropping within the casings 3, thereby maintaining adequate dielectric strength between the contacts 18, 21 should they be separated at this time.
  • check valve 73 will prevent the high arcing pressure within the regions 70 of the extinguishing units 2 from backing into the feed line 72 and forcing contaminated, arced gas back into the gas reservoir 9.
  • the check valve 58a will prevent a loss of pressure in the region 57 above the liquid level in the sump 55, should the porcelain casing 9 crack and lose its gas pressure.
  • control line 66 An important feature of the invention is the maintenance of this gas pressure in the region 57 of sump 55, for this will maintain a positive pressure within control line 66, even though the latter is connected to the sump by pilot valve 64. Otherwise a negative pressure could exist in control line 66 by the height of the liquid therein, and air leakage through the seals for the line 66 might result.
  • circuit interrupter Certain features of the circuit interrupter are set forth and claimed in United States patent application, Serial No. 693,309, filed October 30, 19-57, by Albert P. Strom, and assigned to the assignee of the instant application.
  • a circuit interrupter including a sealed casing. containing an arc extinguishing gas, separable contacts disposed within said sealed casing separable to establish an are, a movable contact rod for effecting the movement of one of said separable contacts, a hydraulic mechanism for actuating said movable contact rod including a hydraulic operating cylinder, a hydraulic piston secured adjacent one end of said movable contact rod and movable within said hydraulic operating cylinder, means defining a bore out of said hydraulic operating cylinder along which said movable contact rod moves, a sealing chamber disposed along said bore of the hydraulic operating cylinder and containing said arc-extinguishing gas, a drain for said sealing chamber, and the gas pressure of the arc-extinguishing gas within said sealing chamber being substantially the same as the gas pressure adjacent the separable contact within said sea'led casing in the closed circuit position of the circuit interrupter.
  • a circuit interrupter including a sealed casing containing an arc extinguishing gas, separable contacts disposed within said sealed casing separable to establish an arc, a movable contact rod for effecting the movement of one of said separable contacts, a hydraulic mechanism for actuating said movable contact rod including a hy draulic operating cylinder, a hydraulic piston secured adjacent one end of said movable contact rod and movable within said hydraulic operating cylinder, means defining a bore out of said hydraulic operating cylinder along which said movable contact rod moves, a sealing chamber disposed along said bore of the hydraulic operating cylinder and containing said arc-extinguishing gas, a drain for said sealing chamber, and the gas pressure of the arcextinguishing gas within said sealingchamber being substantially less than the hydraulic driving pressure.
  • a circuit interrupter including separable contacts, a movable contact rod for effecting the movement of one of the separable contacts, a hydraulic mechanism for actuating said movable contact rod including a hydraulic operating cylinder, a hydraulic piston movable within said hydraulic operating cylinder and secured adjacent one end of said movable contact rod, said hydraulic operating cylinder having a bore through one wall thereof through which the movable contact rod moves, a sealing chamber disposed along said bore of the hydraulic operating cylinder, a drain for said sealing chamber, and said sealing chamber containing gas at a relatively low pressure compared to the hydraulic driving pressure.
  • a circuit interrupter of the gas blast type including an upstanding hollow insulating pedestal, one or more sealed interrupting units supported from the upper end of said hollow pedestal, arc-extinguishing means including piston putter means disposed in at least one sealed interrupting unit, hydraulic operating means at high potential for actuating said piston puffer means, a gas under pressure within said sealed interrupting units, and the same gas at substantially the same pressure completely filling said hollow pedestal.
  • a circuit interrupter including a hollow supporting pedestal completely filled with an arc-extinguishing gas under pressure, a sealed interrupter casing containing the same gas supported at the upper end of said supporting pedestal, arc-extinguishing means including piston puffer means disposed interiorly Within said sealed interrupter casing, hydraulic operating means for actuating said piston puffer means, and a gas feed conduit interconnecting the interior of said hollow supporting pedestal with the sealed interrupter casing so that the pressure of the gas within the sealed casing is substantially at the pressure of the gas within said hollow supporting pedestal.
  • a circuit interrupter including a pair of diverging sealed interrupter casings, a pair of relatively stationary contacts disposed at the outer extremities of the sealed interrupter casings, a pair of cooperable movable contact rods carrying gas-blast puffer pistons, a hydraulic operating mechanism for actuating said movable pair of contact rod-s including a hydraulic operating cylinder at high potential, a pair of hydraulic pistons secured to adjacent inner ends of said movable contact rods and reciprocally movable within said hydraulic operating cylinder, means for constantly maintaining high hydraulic pressure upon the outer sides of the hydraulic pistons tending to effect opening operation thereof, means for reducing the hydraulic pressure between the hydraulic pistons relative to the pressure on the outer faces thereof, a movable rack associated with each hydraulic piston, :and a pinion gear disposed substantially centrally within said hydraulic operating cylinder and meshing with the two movable racks to synchronize the opening and closing motion of the pair of movable contact rods.
  • a circuit interrupter including a pair of diverging sealed interrupter casings, a pair of relatively stationary contacts disposed at the outer extremities of the sealed interrupter casings, a pair of cooperable movable contact rods carrying gas-blast puffer pistons, a hydraulic operating mechanism for actuating said movable pair of contact rods including a hydraulic operating cylinder at high potential, a pair of hydraulic pistons secured to adjacent inner ends of said movable contact rods and reciprocally movable within said hydraulic operating cylinder, means for constantly maintaining high by draulic pressure upon the outer sides of the hydraulic pistons tending to effect opening operation thereof, means for reducing the hydraulic pressure between the hydraulic pistons relative to the pressure on the outer faces thereof, a movable rack associated with each hydraulic piston, and a pinion gear disposed substantially centrally within said hydraulic operating cylinder and meshing with the two movable racks to synchronize the opening and closing motion of the pair of movable contact rods, and an indicator shaft connected to said pinion gear and extending through the Wall of the hydraulic operating
  • a circuit interrupter including a pair of diverging sealed interrupter casings, a pair of relatively stationary contacts disposed at the outer extremities of the sealed interrupter casings, a pair of cooperable movable contacts movable toward each other and carrying gas-blast putter pistons, a pair of movable contact rods supporting said pair of movable contacts and having a pair of actuating pistons secured thereto at the inner ends thereof, a fluid motor at high potential having a single operating cylinder within which is disposed said pair of actuating pistons, rectilinear motion of said actuating pistons away from each other within said single operating cylinder eflecting closing motion of said pair of movable contact rods and movable contacts, a movable rack associated with each actuating piston, a pinion gear disposed substantially centrally Within said single operating cylinder and meshing with the two movable racks to synchronize their motion, said fluid motor having a source of highpressure fluid, and valve means for admitting highpressure fluid from said source to the region within

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  • Circuit Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US693306A 1957-10-30 1957-10-30 Circuit interrupter Expired - Lifetime US3060294A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US693306A US3060294A (en) 1957-10-30 1957-10-30 Circuit interrupter
DEW24273A DE1188173B (de) 1957-10-30 1958-10-16 Elektrischer Schalter
DE1958W0020684 DE1833262U (de) 1957-10-30 1958-10-16 Elektrischer schalter.
CH6531358A CH366316A (de) 1957-10-30 1958-10-22 Elektrischer Schalter, insbesondere Leistungsschalter
GB33936/58A GB860245A (en) 1957-10-30 1958-10-23 Improvements in or relating to electric circuit interrupters
FR1214299D FR1214299A (fr) 1957-10-30 1958-10-29 Interrupteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US693306A US3060294A (en) 1957-10-30 1957-10-30 Circuit interrupter

Publications (1)

Publication Number Publication Date
US3060294A true US3060294A (en) 1962-10-23

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ID=24784133

Family Applications (1)

Application Number Title Priority Date Filing Date
US693306A Expired - Lifetime US3060294A (en) 1957-10-30 1957-10-30 Circuit interrupter

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US (1) US3060294A (de)
CH (1) CH366316A (de)
DE (1) DE1188173B (de)
FR (1) FR1214299A (de)
GB (1) GB860245A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311726A (en) * 1964-10-05 1967-03-28 Westinghouse Electric Corp Puffer-type fluid-blast circuit interrupter with pressurized casing for actuating driving piston
US3356810A (en) * 1965-03-31 1967-12-05 Siemens Ag Centering device for conducting liquefied arc-extinguishing gas to a highpressure reservoir

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3562465A (en) * 1968-10-21 1971-02-09 Ite Circuit Breaker Ltd Telescopic switch for isolated phase bus
JPH01213927A (ja) * 1988-02-23 1989-08-28 Mitsubishi Electric Corp 碍子形ガスしや断器

Citations (21)

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US1706746A (en) * 1924-03-17 1929-03-26 Gen Electric Electric switch
US1895907A (en) * 1928-07-24 1933-01-31 Frank G Baum High voltage electrical switch
US1933356A (en) * 1932-12-31 1933-10-31 Gen Electric Demand meter
US2206324A (en) * 1938-03-05 1940-07-02 Lade Frederick Leonard Safety switch
US2281139A (en) * 1941-04-24 1942-04-28 Leroy A Clark Traffic signal
US2436190A (en) * 1944-11-07 1948-02-17 Gen Electric Electric circuit breaker
GB599970A (en) * 1945-09-25 1948-03-25 Reyrolle A & Co Ltd Improvements in or relating to electric circuit-breakers of the gas-blast type
US2449518A (en) * 1943-02-15 1948-09-14 Westinghouse Electric Corp Circuit interrupter
US2541917A (en) * 1947-12-17 1951-02-13 Stromberg Carlson Co Band switching arrangement
US2555898A (en) * 1949-01-28 1951-06-05 Allis Chalmers Mfg Co Fluid operating and braking system for circuit interrupters
US2604562A (en) * 1949-01-29 1952-07-22 Gen Electric Electric circuit interrupter
US2611846A (en) * 1949-03-07 1952-09-23 Lindsay M Applegate Circuit breaker
US2662133A (en) * 1949-09-21 1953-12-08 Royal Electric Mfg Co Disconnect switch
US2678983A (en) * 1950-05-16 1954-05-18 Westinghouse Electric Corp Compressed gas circuit interrupter
US2719195A (en) * 1951-04-02 1955-09-27 Forges Ateliers Const Electr Circuit breaker operating systems
US2748226A (en) * 1953-02-26 1956-05-29 Westinghouse Electric Corp Compressed-gas circuit interrupter
US2757261A (en) * 1951-07-19 1956-07-31 Westinghouse Electric Corp Circuit interrupters
GB755016A (en) * 1953-07-08 1956-08-15 Reyrolle A & Co Ltd Improvements relating to electric switchgear
GB760355A (en) * 1954-03-17 1956-10-31 Reyrolle A & Co Ltd Improvements in or relating to gas-blast electric circuit-breakers
GB765524A (en) * 1954-02-17 1957-01-09 Asea Ab Hydraulic operating devices, especially for electric circuit breakers
US2783337A (en) * 1953-12-10 1957-02-26 Gen Electric Fluid blast circuit interrupter

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Publication number Priority date Publication date Assignee Title
US1934454A (en) * 1932-04-13 1933-11-07 Gen Electric Oil blast circuit breaker

Patent Citations (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1706746A (en) * 1924-03-17 1929-03-26 Gen Electric Electric switch
US1895907A (en) * 1928-07-24 1933-01-31 Frank G Baum High voltage electrical switch
US1933356A (en) * 1932-12-31 1933-10-31 Gen Electric Demand meter
US2206324A (en) * 1938-03-05 1940-07-02 Lade Frederick Leonard Safety switch
US2281139A (en) * 1941-04-24 1942-04-28 Leroy A Clark Traffic signal
US2449518A (en) * 1943-02-15 1948-09-14 Westinghouse Electric Corp Circuit interrupter
US2436190A (en) * 1944-11-07 1948-02-17 Gen Electric Electric circuit breaker
GB599970A (en) * 1945-09-25 1948-03-25 Reyrolle A & Co Ltd Improvements in or relating to electric circuit-breakers of the gas-blast type
US2541917A (en) * 1947-12-17 1951-02-13 Stromberg Carlson Co Band switching arrangement
US2555898A (en) * 1949-01-28 1951-06-05 Allis Chalmers Mfg Co Fluid operating and braking system for circuit interrupters
US2604562A (en) * 1949-01-29 1952-07-22 Gen Electric Electric circuit interrupter
US2611846A (en) * 1949-03-07 1952-09-23 Lindsay M Applegate Circuit breaker
US2662133A (en) * 1949-09-21 1953-12-08 Royal Electric Mfg Co Disconnect switch
US2678983A (en) * 1950-05-16 1954-05-18 Westinghouse Electric Corp Compressed gas circuit interrupter
US2719195A (en) * 1951-04-02 1955-09-27 Forges Ateliers Const Electr Circuit breaker operating systems
US2757261A (en) * 1951-07-19 1956-07-31 Westinghouse Electric Corp Circuit interrupters
US2748226A (en) * 1953-02-26 1956-05-29 Westinghouse Electric Corp Compressed-gas circuit interrupter
GB755016A (en) * 1953-07-08 1956-08-15 Reyrolle A & Co Ltd Improvements relating to electric switchgear
US2783337A (en) * 1953-12-10 1957-02-26 Gen Electric Fluid blast circuit interrupter
GB765524A (en) * 1954-02-17 1957-01-09 Asea Ab Hydraulic operating devices, especially for electric circuit breakers
GB760355A (en) * 1954-03-17 1956-10-31 Reyrolle A & Co Ltd Improvements in or relating to gas-blast electric circuit-breakers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311726A (en) * 1964-10-05 1967-03-28 Westinghouse Electric Corp Puffer-type fluid-blast circuit interrupter with pressurized casing for actuating driving piston
US3356810A (en) * 1965-03-31 1967-12-05 Siemens Ag Centering device for conducting liquefied arc-extinguishing gas to a highpressure reservoir

Also Published As

Publication number Publication date
DE1188173B (de) 1965-03-04
GB860245A (en) 1961-02-01
CH366316A (de) 1962-12-31
FR1214299A (fr) 1960-04-07

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