US3134876A - Gas blast circuit breaker with noisereducing exhaust muffler assembly - Google Patents

Gas blast circuit breaker with noisereducing exhaust muffler assembly Download PDF

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Publication number
US3134876A
US3134876A US142338A US14233861A US3134876A US 3134876 A US3134876 A US 3134876A US 142338 A US142338 A US 142338A US 14233861 A US14233861 A US 14233861A US 3134876 A US3134876 A US 3134876A
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United States
Prior art keywords
enclosure
flow
exhaust
circuit breaker
exhaust gases
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Expired - Lifetime
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US142338A
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English (en)
Inventor
Chang Han
Vincent N Stewart
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General Electric Co
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General Electric Co
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Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US142338A priority Critical patent/US3134876A/en
Priority to GB36869/62A priority patent/GB998591A/en
Priority to DEG36034A priority patent/DE1223440B/de
Priority to CH1155462A priority patent/CH405464A/de
Priority to FR911010A priority patent/FR1334851A/fr
Application granted granted Critical
Publication of US3134876A publication Critical patent/US3134876A/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
    • H01H33/02—Details
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/58—Silencers for suppressing noise of switch operation

Definitions

  • the present invention relates to a gas blast type of electric circuit breaker and, more particularly, relates to a mufller assembly for reducing the noises resulting from the flow of hot exhaust gases from the circuit breaker to the surrounding atmosphere.
  • circuit interruption is effected by causing a high speed blast of pressurized gas to flow for a short period through the usual arcing region of the breaker.
  • This blast facilitates circuit interruption by cooling the arc and by cleansing the arcing region of hot metallic vapors and other highly heated arcing products.
  • the highly heated gases are discharged to the surrounding atmosphere in a short and intense burst.
  • the heated gases are then flowing at high speed, and the result is a loud noise, which in many cases is objectionable.
  • An object of our invention is to provide an improved exhaust mufiler that is capable of greatly reducing the amount of noise resulting from operation of the circuit breaker. Another object is to provide a mufller of this nature which is highly compact and does not create an objectionable amount of back pressure that could impair the ability of the gas blast to perform its intended arc-extinguishing function.
  • Another object is to provide a mufller, which although compact and efiicient in reducing noise, allows gases to be dissipated therefrom rapidly enough to permit 'an unimpeded, closely-succeeding operation of the circuit breaker.
  • the exhaust gases are introduced into a chamber from which they are discharged in a controlled manner through a large number of spacedapart openings in the walls of the chamber.
  • Another object of our invention is to distribute this flow. generally uniformlybetween substantially all these openings so that excessive velocities donot occur through the openings in any localized region of the muffler.
  • an exhaust muffler comprising a pair of end walls and a hollow enclosure extending axially of the muffier betweenthe end walls to define a chamber internally thereof.
  • the enclosure has perforations extending generally radially therethrough at spaced-apart locations about substantially its entire periphery and length for allowing exhaust gases to flow generally radially outward therethrough.
  • an inlet to the expansion chamber that communicates with the exhaust passage for directing exhaust gases axially of the mufiler towards said other end wall.
  • means including a deflector on said other end wall for causing gases from the inlet to flow in a reverse axial direction along the internal wall of the enclosure after impinging against the deflector.
  • This reverse axial flow helps to provide a more uniform distribution of flow through the perforations in the enclosure.
  • FIG. 1 is a partially schematic side elevational view of a circuit breaker embodying one form of the present invention.
  • FIG. 2 is an enlarged sectional view along the line 2-2 of FIG. 1.
  • the circuit breaker shown therein comprises a metallic tank 10 mounted upon a hollow insulating column 11 with an exhaust mufiler assembly 9 of the present invention therebetween.
  • the tank is at a high voltage with respect to ground, and the insulating column 11 serves to electrically isolate the tank from ground as well as to support the tank.
  • the tank 10 is normally filled with pressurized gas that serves as an arc-extinguishing medium as will hereinafter be described.
  • the basic circuit breaker structure Within the tank generally corresponds to that disclosed in detail and claimed in U.S. Patent No. 2,783,338Beatty, assigned to the assignee of the present invention.
  • the structure of the circuit breaker will be described herein only to the extent believed necessary to convey an understanding of the present invention that relates to the exhaust mufiler assembly. Reference may be had to the Beatty patent if a more detailed description is desired of the circuit breaker.
  • One pair of contacts comprises a stationary contact 12 and a movable contact 14.
  • the other pair of contacts comprises a stationary contact 13 and a movable contact 15.
  • the movable contacts 14 and 15 are mounted on two stationary pivots 16 and 17 carried by a central metallic support 20 that is mechanically and electrically connected tothe tank 10.
  • the stationary contact 12 is shown mounted on the inner end of a lead-in bushing 25 projecting into the tank through its left-hand end wall and providing an electricalconnection through a conductive stud 27 between the stationary contact 12 and a terminal 29 of the circuit breaker.
  • the other stationary contact 13 is shown mounted on a bushing 26 projecting into the tank through its right-hand end wall and providing a connection through a conductive stud 28 between the other terminal 30 of the circuit breaker and the contact 13.
  • the lead-in bushings 25 and 26 insulate the contacts 12 and 13 from. the tank 10 when the circuit breaker is open.
  • a common driving member in the form of a reciprocal crosshead 35 is provided.
  • the movable contact 14 is coupled to this crosshead 35 by means of a link 36 pivotally connected at its respective opposite ends to the crosshead 35 and the movable contact 14, whereas the movable contact 15 is coupled to the crosshead 35 by means of a second link 37 pivotally connected at its respective opposite ends to the crosshead 35 and the movable contact 15.
  • Upward movement of the crosshead 35 causes the lower ends of the movable contacts 14 and 15 to separate from their respective stationary contacts 12 and 13, and move into an open position; whereas return movement of the cross head 35 returns the movable contacts 14 and 15 from the open position to a closed position.
  • the operating mechanism is of the type disclosed and claimed in the aforementioned Beatty'Patent 2,783,338.
  • a blast of pressurized air is caused to flow through the arcing region.
  • This blast of air is controlled by a normally-closed blast valve 38 mounted within the metallic support 20.
  • the blast valve 38 When the blast valve 38 is lifted into its open position, communication is established between an exhaust passage 40 and the space within the tank through exhaust orifices 39. This causes pressurized gas within the tank to flow through the arcing region into the exhaust passage 40 via paths generally indicated by the dotted line arrows 41 of FIG. 1.
  • the blast valve is returned to its closed position to terminate the gas blast.
  • the blast valveand its control means are described in greater detail in the aforementioned Beatty patent.
  • the gases flowing through the exhaust passage 40 are extremely hot inasmuch as they consist of arcing products or gases that have been heated by the arc. After passing through the exhaust passage 40, these hot gases enter the muflier assembly 9, from which they are discharged to the surrounding atmosphere in a manner which will soon be described in more detail.
  • FIG. 2 a sectional view along the line 2-2 of FIG. 1 is shown of the exhaust muffler assembly 9.
  • Upper and lower parallel plates 45 and 46 which are perpendicular to the axis of the exhaust passage 40 are arranged to receive suitable tie bolts therethrough such as shown at 47 to clamp therebetween the respective elements that form the improved exhaust muffler assembly of the present invention.
  • the upper plate 45 has a suitable central aperture 48 aligned with the exhaust passage 40 from the pressurized tank 10 of FIG. 1.
  • An upper deflector 50 is secured to the upper plate 45 by a plurality of bolts such as shown at 53.
  • the upper deflector has a centrally-located aperture 52 aligned with the exhaust passage 40 and a downwardly opening concave face51 that surrounds the central aperture 52.
  • a thin-walled ring 54 fits within the central aperture 52 in the upper deflector 50.
  • the aligned apertures 48 and 52 and the ring 54 together define an inlet to the muffler assembly 9.
  • a lower deflector 55 Opposing the upper deflector 50 and spaced therefrom is a lower deflector 55 having an active surface 56 of a generally semi-toroidal form.
  • a resilient buffer member 60 of rubber or the like secured to the lower plate 46 by a plurality of bolts, such as shown at 61, whereeach bolt has a resilient washer 62 disposed between its head and the lower deflector 55 to substantially isolate the lower deflector 55 from direct contact with the lower plate 46 of the assembly;
  • a thrust plate such as shown at 63 is positioned between the lower deflector 56 and the buffer 60 to more uniformly distribute the downward force transmitted to the buffer 60, as will soon appear more clearly.
  • the upper plate 45 and the lower plate 46 retain in a sandwich form a plurality of concentric cylinders 65-68 therebetween. These cylinders may be thought of as constituting a hollow enclosure for an expansion chamber 69 disposed internally thereof.
  • the perforated cylinders 65 and 66 are radially spaced from each other to define a suitable acoustic chamber 70 therebetween. Suitable spacers 71 disposed between these two cylinders assure that'the desired spacing is maintained.
  • the inner cylinder 65 is provided with a plurality of perforations such as at 75 distributed over substantially its entire periphery and length.
  • the intermediate or second cylinder 66 is also suitably perforated such as at 76, preferably with an increased total number of perforations having a reduced diameter as compared to those provided in the first cylinder 65. 'These perforations 76 are distributed over a major portion of the periphery and length of the cylinder 66. Exhaust gases from the expansion chamber 69 will be discharged radially outward through the perforations in the two cylinders 65 and 66.
  • Gases passing through the perforated second cylinder 66 will impinge upon a porous cylinder assembly 67 that is preferably formed, in accordance with one form of the present invention, of three distinct elements comprising the cylindrical reticulated members, or screens, 77 and 78 and a compacted filler 79 therebetween of copper wool or a similar substance that retains a porous quality when suitably compacted.
  • the porous cylinder assembly 67 thus formed, further restricts the escaping exhaust gases that pass through the second perforated cylinder 66 and attenuates high frequency noise.
  • an exterior porous cylinder 68 is positioned as shown adjacent to the periphery of the porous cylinder assembly 67 and may be formed from a porous material, such as loosely-woven cellulose fibers, to further attenuate noise.
  • a plurality of vertically-spaced louvers 85 are shown positioned adjacent to but spaced from the periphery of the outer cylinder 68 to provide the mutlier assembly with adequate protection against possible contamination from moisture. Where moisture contamination is no problem, the louvers may be omitted.
  • the operation of the exhaust mnfiier assembly 9 formed in accordance with the present invention provides that the hot exhaust gases released from the pressurized tank 10, shown by FIG. 1, will enter the exhaust muffler assembly 9 through the exhaust passage 40 and the muflier inlet 48, 52.
  • the hot exhaust gases then flow axially of the muflier assembly in a downward direction and impinge directly upon the lower deflector 55, which reverses the direction of flow of the exhaust gases to a new direction that is generally opposed to the entrance flow of the exhaust gases.
  • a portion of the exhaust gases will thereafter impinge upon the upper deflector 50, and this results in flow again being reversed by approximately 180 from the previous direction.
  • the buffer member 60 in the present invention provides a substantial reduction in the noise and vibration that results from the sharp impact caused by the sudden axial flow of the exhaust gases into the exhaust muffler assembly 9 when the circuit breaker is opened. For example,
  • this sudden flow of exhaust gases produces a force of approximately 2000 pounds inasmuch as the escape velocity of the exhaust gases into the muffler assembly is 600 or 700 feet per second.
  • the resilient buffer 60 effects additional noise reduction.
  • the resilient washers 62 further isolate the lower plate from the effect of this impact by absorbing the rebound energy that is released from the buffer 60 when the gas force on the lower deflector 55 diminishes.
  • the heads of bolts 61 may be thought of as stops for limiting this rebound motion and the resilient washers 62 may be thought of as being disposed between stops and the deflector 55.
  • the inner cylinder 65 is of a thick-walled construction so that it forms, together with the end walls 45, 46 at its opposite ends, a thick-walled housing. Because this housing is of a thick-walled construction, it is capable of confining within its interior much of the noise generated upstream therefrom and of thus impeding the transmission of such noise to the surrounding atmosphere.
  • the number of openings 75 provided in the cylinder 65 is limited, at least in comparison to the number of openings provided in cylinder 66.
  • the openings 75 that are provided, however, are distributed over substantially the entire periphery and length of the cylinder 65.
  • the exhaust gases pass radially outward through these openings 75, undergoing a generally isentropic expansion that results in a reduction in temperature. Thereafter, the exhaust gases enter the acoustic chamber 70, which has a further noise attenuating effect upon the gases. Subsequently, the gases pass through the second or intermediate perforated cylinder 66. Again a decrease in temperature results due to an isentropic expansion as the exhaust gases pass through the perforations 76 of the second cylinder 66.
  • the acoustic chamber 70 serves the additional purpose of further dispersing the gas and distributing the pressure more uniformly over the entire surface area of the intermediate cylinder, 66 so that a generally uniform distribution of flow is effected through the openings in cylinder 66.
  • the intermediate cylinder 66 has more openings therethrough than theinner cylinder 65, and this contributes to a desirable reduction in the gas velocity through the openings 76 and to a more uniform rate of flow through the openings 76. Both of these factors help to lessen the amount of noise resulting from the passage of gas through the openings 76.
  • the effective exhaust area through the cylinder 66 should be provided by perforations as close together as possible and as small as possible. This appears to result in a cancellation of fiow'turbulence in the exhaust gases, which effects a reduced noise level. More specifically, noise is generated by jets of exhaust gases shearing still air about the periphery of each perforation and the periphery of each related jet. Having the perforations close together counteracts such noise generation by eliminating this still air or at least reducing it and thus reducing the effect of the jets shearing still air. In some cases, it might be desirable to place an intermediate cylinder between the cylinders 65 and 66, and these same considerations would apply to such an intermediate cylinder.
  • the exhaust gases After leaving the acoustic chamber 70 through the openings76, the exhaust gases impinge upon the porous cylinder assembly 67 which contains the tightly packed copperwool 79 or a similar substance to provide further diffusion of the exhaust gases and to attenuate flow noises that may have escaped through the prior components of. the m'ufiler assembly. This attenuation is maximized when thecompacted filler 79 of copper or similar substance isdensely packed between the reticulated elements or screens 77 and 7 8.
  • the surface of the copper Wool adjacent to the perforated intermediate cylinder 66 becomes pocketed by the impinging jets of exhaust gases passing through'the perforations 76 of the intermediate cylinder. These pockets, not shown, contribute to reduction of the noise level of the escaping exhaust gases.
  • an exterior porous cylinder 68 formed from loosely-woven cellulose fibers or a similar porous substance is positioned about the external periphery of the exhaust muffler assembly 9. This cylinder has been found most efl'icient in attenuating the higher frequency components of the noise. Further, should the exhaust muffler assembly be exposed to the elements, as previously discussed, a plurality of downwardly-flared louvers such as shown at 85 may be positioned adjacent to and spaced from the external periphery of the muffler assembly 9 to restrict the entry of moisture. Eventually, all of the exspare.
  • An important purpose of the deflectors 50 and 55 is to prevent the radial flow through the inner cylinder 65 from being concentrated in any localized area of the cylinder, or, in other words, to more uniformly distribute this radial flow among all of the perforations 75 in the cylinder 65.
  • the velocity of the gas in traveling through the radially-outer portion of the mufi ler in any given area can be limited to a value low enough to prevent the generation of excessive noise.
  • the greater the velocity through a given perforation or opening the greater will be the amount of noise generated.
  • the deflectors perform this important purpose by effecting a moreuniform distribution of the pressure Within the internal space of the mufller and also by causing the exhaust gases to flow generally parallel to the inner surface of the cylinder 65 prior to being discharged radiallyoutward through the perforations 75.
  • This pattern of flow has been found to contribute materially to effecting a more uniform distribution of radial flow throughout the entire perforated surf-ace area of the inner cylinder 65.
  • the mufiier serves the additional functions of suppressing the ejection of flames from the circuit breaker and of preventing possible flashovers that could occur if hot ionized gases are permitted to enter regions of high dielectric stress.
  • Our mufiler is capable of meeting this latter limitation since it allows the gases to escape quicktly enough to reduce the pressure within the chamber 69 to atmosphere within about six or seven cycles of 60 cycle alternating cdrrent after the blast valve 38 is first opened.
  • the shortest reclosing times ordinarily utilized in present-day practice are around twelve to fifteen cycles, so it will be apparent that the muflier completely dissipates the exhaust gases with an ample margin to Enough holes must be present in the cylinder 65 7 to enable this latter performance requirement to be met.
  • the deflectors 50' and 55 of a metal capable of absorbing a relatively large amount of heat in a short time.
  • this material is copper or a copper alloy having a good thermal conductivity, for example, substantially higher than that of steel or iron.
  • the exposed surfaces of the deflectors are preferably left in a roughened condition to facilitate heat transfer to the deflectors.
  • it may be desirable to locate a suitable heat exchanger (not shown) inside the chamber 69 to further (facilitate cooling of the exhaust gas.
  • a noise-reducing exhaust muifler comprising a pair of end walls and a hollow enclosure extending axially of the muffler between said end walls to define an expansion chamber internally thereof, said enclosure having perforations extending generally radially therethrou-gh at spaced-apart locations about a major portion of the periphery and length of said enclosure for allowing exhaust gases to flow generally radially outward therethrough, an inlet to the expansion chamber in one of said end walls adapted to communicate with said exhaust passage for directing exhaust gases axially of the mufller toward said other end 1 wall, means including opposed deflector members adjacent to each end wall for causing exhaust gases from said inlet to flow repetitively over a circulating path which extends between said two deflectors and has a portion extending generally parallel to the inner surface of said axially-extending enclosure in the region of said enclosure, whereby to provide for
  • a noise-reducing exhaust mufller comprising a pair of end walls and a hollow enclosure extending ax- ;ially of the muffler between said end walls to define an expansion chamber internally thereof, said enclosure having perforations extending generally radially therethrough at spaced-apart locations about a major portion of the periphery and length of vsaid enclosure for allowing ex- 8 V haust gases to flow generally radially outward therethrough, an inlet to the expansion chamber in one of said end walls adapted to communicate with said exhaust passage for directing exhaust gases axially of the muffler toward said other end wall, means includingopposed deflector members adjacent to each end wall for causing exhaust gases from said inlet to flow repetitively, over a circulating path which extends between said two deflectors and has a portion extending generally parallel to the inner surface of said axially-extending enclosure in the
  • a noise-reducing exhaust muffler comprising a pair of end walls and a hollow enclosure extending axially of the muffler between said end walls to define an expansion chamber internally thereof, said enclosure having perforations extending generally radially theret-hrough at spaced-apart locations about a major portion of the periphery and length of said enclosure for allowing exhaust gases to flow generally radially outward therethrough, an inlet to the expansion chamber in one of said end Walls adapted to communicate with said exhaust passage for directing exhaust gases axially of the mufiler toward said other end wall, means including opposed deflector members adjacent to each end Wall for causing exhaust gases from said inlet to flow repetitively over a circulating path which extends between said two deflectors and has a portion extending generally parallel to the inner surface of said axially-extending enclosure in the region of said enclosure, whereby to provide for a more
  • a noise-reducing exhaust mufller comprising a pair of end walls and a hollow enclosure extending axially of the muffler between said end walls to define an expansion chamber internally thereof, said enclosure having perforations extending generally radially theret-hrough at spaced-apart locations about a major portion of the periphery and length of said enclosure for allowing ex haust gases to flow generally radially outward therethrough, an inlet to the expansion chamber in one of said end walls adapted to communicate with said exhaust passage for directing exhaust gases axially of the muffler toward said other end wall, means including opposed deflector members adjacent to each end wall for causing exhaust gases from said inlet to flow repetitively over a circulating path which extends between said two deflectors and has a portion extending generally parallel to the inner surface of said axially-extending enclosure in the region of said enclosure, whereby to provide for
  • a noise-reducing exhaust mufiier comprising a pair of end walls and a hollow enclosure extending axially of the mufller between said end walls to define an expansion chamber internally thereof, said enclosure having perforations extending generally radially therethrough at spaced-apart locations about a major portion of the periphery and length of said enclosure for allowing exhaust gases to fiow generally radially outwardly therethrough, an inlet to the expansion chamber in one of said end walls adapted to communicate with said exhaust passage for directing exhaust gases axially of the mufller toward said other end wall, means including a deflector on said other end wall for causing gases from said inlet to flow in a reverse axial direction along the internal wall of said enclosure a-fiter impinging against said deflector, whereby to provide for a more uniform distribution of flow through said perforations, and a 10 resilient buffer disposed between said

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US142338A 1961-10-02 1961-10-02 Gas blast circuit breaker with noisereducing exhaust muffler assembly Expired - Lifetime US3134876A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US142338A US3134876A (en) 1961-10-02 1961-10-02 Gas blast circuit breaker with noisereducing exhaust muffler assembly
GB36869/62A GB998591A (en) 1961-10-02 1962-09-28 Improvements in gas blast electric circuit breaker with noise-reducing exhaust muffler assembly
DEG36034A DE1223440B (de) 1961-10-02 1962-09-28 Schallmindernder Auspufftopf fuer Druckgasschalter
CH1155462A CH405464A (de) 1961-10-02 1962-10-02 Schalldämpfender Auspufftopf für Druckluftschalter
FR911010A FR1334851A (fr) 1961-10-02 1962-10-02 Disjoncteur à soufflage de gaz équipé d'un pot d'échappement pour réduire le bruit

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Application Number Priority Date Filing Date Title
US142338A US3134876A (en) 1961-10-02 1961-10-02 Gas blast circuit breaker with noisereducing exhaust muffler assembly

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US3134876A true US3134876A (en) 1964-05-26

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US142338A Expired - Lifetime US3134876A (en) 1961-10-02 1961-10-02 Gas blast circuit breaker with noisereducing exhaust muffler assembly

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US (1) US3134876A (de)
CH (1) CH405464A (de)
DE (1) DE1223440B (de)
GB (1) GB998591A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268697A (en) * 1963-10-31 1966-08-23 Mitsubishi Electric Corp Compressed-gas circuit interrupters having exhaust valve structures
US3617667A (en) * 1970-01-27 1971-11-02 Gen Electric Gas-blast circuit breaker with noise-reducing exhaust muffler assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5098397U (de) * 1974-01-10 1975-08-15
US4596307A (en) * 1983-04-26 1986-06-24 Challis Louis A Fluid discharge silencer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1045419A (en) * 1912-08-28 1912-11-26 Nicholas Michael Matula Muffler.
US2125525A (en) * 1935-07-13 1938-08-02 Bbc Brown Boveri & Cie Electric circuit breaker
FR914756A (fr) * 1944-11-06 1946-10-17 Oerlikon Maschf Interrupteur à gaz comprimé
US2459600A (en) * 1944-12-14 1949-01-18 Westinghouse Electric Corp Compressed gas circuit interrupter
US2636961A (en) * 1951-11-09 1953-04-28 Gen Electric Electric circuit breaker
US2807329A (en) * 1951-05-07 1957-09-24 William J Caldwell Expander silencer unit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE551757C (de) * 1928-09-08 1932-06-04 Aeg Schalter mit Lichtbogenloeschung durch stroemendes Druckgas
DE732961C (de) * 1939-05-05 1943-03-16 Merlin Gerin Auspufftopf fuer elektrische Druckgasschalter
FR895927A (fr) * 1943-04-08 1945-02-07 Delle Atel Const Electr Dispositif d'échappement des gaz pour disjoncteurs à auto-soufflage

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1045419A (en) * 1912-08-28 1912-11-26 Nicholas Michael Matula Muffler.
US2125525A (en) * 1935-07-13 1938-08-02 Bbc Brown Boveri & Cie Electric circuit breaker
FR914756A (fr) * 1944-11-06 1946-10-17 Oerlikon Maschf Interrupteur à gaz comprimé
US2459600A (en) * 1944-12-14 1949-01-18 Westinghouse Electric Corp Compressed gas circuit interrupter
US2807329A (en) * 1951-05-07 1957-09-24 William J Caldwell Expander silencer unit
US2636961A (en) * 1951-11-09 1953-04-28 Gen Electric Electric circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3268697A (en) * 1963-10-31 1966-08-23 Mitsubishi Electric Corp Compressed-gas circuit interrupters having exhaust valve structures
US3617667A (en) * 1970-01-27 1971-11-02 Gen Electric Gas-blast circuit breaker with noise-reducing exhaust muffler assembly

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Publication number Publication date
CH405464A (de) 1966-01-15
DE1223440B (de) 1966-08-25
GB998591A (en) 1965-07-14

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