US2833896A - Electric circuit breakers of the air or gas-blast type - Google Patents

Electric circuit breakers of the air or gas-blast type Download PDF

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US2833896A
US2833896A US566973A US56697356A US2833896A US 2833896 A US2833896 A US 2833896A US 566973 A US566973 A US 566973A US 56697356 A US56697356 A US 56697356A US 2833896 A US2833896 A US 2833896A
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gas
main
air
pressure
contact
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US566973A
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English (en)
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Roxburgh Albert
Leigh Albert
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British Thomson Houston Co Ltd
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British Thomson Houston Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
    • B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
    • C08G59/14—Polycondensates modified by chemical after-treatment
    • C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
    • C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
    • C08G59/1455—Monocarboxylic acids, anhydrides, halides, or low-molecular-weight esters thereof
    • C08G59/1461—Unsaturated monoacids
    • C08G59/1472—Fatty acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C08L63/10—Epoxy resins modified by unsaturated compounds
    • 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
    • H01H33/16—Impedances connected with contacts
    • 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
    • H01H33/16—Impedances connected with contacts
    • H01H33/164—Impedances connected with contacts the impedance being inserted in the circuit by blowing the arc onto an auxiliary electrode

Definitions

  • This invention relates to electric circuitinterrupters of the airor gas-blast type, and particularly to such circuit interrupters of the kind wherein aresistor is connected in parallel with the circuit interrupting contact gap or gaps "for controlling the recovery voltage rise or otherwise improving the circuit interrupting characteristics of the interrupter.
  • Circuit interrupters of this kind are known in 'Which a gap is included in series with the resistor, the electrodes of said gap and the resistor being thus connected in parallel'with the main or circuit interrupting contacts, so that under certain conditions of recovery volt-age rise the gap will break down and permit passage of current through said resistor.
  • the main or circuit interrupting contacts are mounted within .a contact chamber and biased to the closed position, being opened by the application of air pressure to said contact chamber; the invention is eminently although not exclusively, applicable in such circuit interrupters.
  • a space within which the electrodes of said series gap are positioned is provided with pressure reducing means responsive to flow of air or gas produced during opening of the said circuit interrupting gap or gaps, whereby to facilitate breakdown of said series gap.
  • said space may, for'the purpose above set forth, be arranged so as tobe subject 'to reduction of pressure due to flow of the gas including the use of air, from a main contact chamber.
  • the electrodes may be positioned within an auxiliary chamber communicating with a main contact chamber at or located adjacent to a discharge port or ports in said main chamber.
  • the space within which the electrodes are positioned is connected with ejector means through which air or gas is caused to flow on opening of the circuit breaker and to entrain air or gas from said space and thereby reduce the pressure within said space substantially below atmospheric pressure.
  • the ejector means may be supplied with pressure air or gas from a ch-arnber enclosing the main contacts directly from the upstream side of the main contacts or may be arranged within a discharge passage on the downstream side of the main contacts.
  • the circuit interrupter may or may not include isolating contacts as part of the interrupter itself, since there will be no residual current to be interrupted after the electrode gap has extinzuished the resistor current, and therefore the open United States Patent "ice .2 circuit conditions are maintained for so long astthe main contacts are open.
  • isolating contacts are provided as part of thecircuit interrupter-itself, means may or may not be provided whereby after opening of the isolating contacts the air or gas pressure will be released from the contact chamber and the auxiliary chamber. and reclosure of the main contacts thereby effected.
  • the opening of the isolating contacts may, forexample, ibe efiected by the usual means so as to occur afterextinction of the current in the resistor.
  • circuit breakers of the kind referred to wherein a resistorand seriesgap areprovided ashereinbef-ore indi- .cated, and wherein said gap is arranged to break down and permit passage of current through saidresistor when the main contacts are opened, and means 'are provided for the application of air or gas pressure to said series gap whereby .to quench the 'arc in the latter and terminate :the flow of current through the series resistor.
  • meansJma-y be provided for applying the .air or gas pressure :to the series gap with a time delay after opening of the .main contacts.
  • the arrangement is preferably such that after the main contacts have been opened .to extinguish the current, pressure air or gas will be supplied to the space ,in which the electrodes .are 1308i .tioned, whereby to increase the breakdown voltage of the latter and sofaci-litate interruption of the resistor current, this .feature of the present arrangements being thus ,in accordance with the invention described and claimed in application for United States Serial .No. 489,564, new Patent'No. 2,794,886, aforesaid.
  • Fig. .1 is a sectional elevation showing one embodiment of the invention
  • FIG. 2 is an outline elevation with reference to which one illustration of the arrangement of Fig. 1 .in'combination with an isolating switch means will be described,
  • Fig. 3 is an outline elevation showing part of a .circuit breaker comprising a duplication of .the contact arrange ment employed in Fig. 2, and
  • Figs. 4 and 5 are sectional elevations showing, respectively, two .further embodiments of the invention.
  • the circuit breaker includes a main contact chamber which is of the-otherwise well known type comprising a horizontal tubular insulating member 1 extending from a conductive assembly 2 mounted on a tubular supporting insulator 3, the lower end of which is secured to a member 4 which in turn is suitably mounted on a main framework or base .(not shown) for the circuit breaker.
  • the tubular member 1 carries at its free end a contact and line terminal unit or assembly 5.
  • the assembly 5 comprises a metal casing 6 having an end wall 7 which closes the adjacent end of the tube 1, the assembly 5 being secured to the member 1 such as by a metal ring 8 of the usual construction secured .to the wall 7.
  • the other end of the member 1 is secured to the metal assembly 2 by means of a similar ring 9.
  • the Wall 7 is formed with a cylinder 10 which extends inwardly and coaxially of the insulating member 1, and a tubular moving contact member 11 extends through an aperture at 12 in the wall 7.
  • Contact 11 includes a flange 13 which forms a piston working within the cylinder 10 and operable by air pressure in said cylinder.
  • the contact 11 is adapted .to engage at its .inner :end with a fixed rod 14 which extends from the conductiveassembly 2, being mounted therein by means of a metal tube 15 which is secured, such as by welding, to an end-plate 16'closingthe assembly 2;
  • circuit breaker The various parts of the circuit breaker are shown in Fig. 1 at a stage during the interruption of the current as will hereinafter be described.
  • the metal casing 6 is formed as a cylinder in which is movable a piston 17, this piston being biased by means of a compression spring 18 into engagement with the adjacent end of the tubular moving contact 11 so as in the normal condition of the switch parts to hold the latter in contact with the end of the fixed contact 14.
  • the piston '17 is provided with vents such as 19 whereby free movement of said piston is permitted, said vents equalising the pressure on the two sides of the piston whereby the latter will not be responsive to the pressure conditions within the casing 6.
  • the casing 6 includes a further cylindrical portion 21 provided with a plurality of outlet ports such as 22.
  • the internal diameter of said cylindrical portion 21 is less than that of the main space within the contact unit and the total area of the discharge passages 22 is greater than the cross-sectional area within the portion 21, so that the latter constitutes a throat through which the air will be discharged from the contact unit through said openings to atmosphere.
  • This throat may be given a venturi form as shown at 21a.
  • the resistor in this embodiment of the invention comprises a resistance element 28 housed within a tubular insulating casing 2? conveniently supported as shown with its axis parallel with that of the member 1.
  • the casing 29 is mounted by means of a conducting member'3t) which serves to connect one end of the resistor with the assembly 2 and thereby with the fixed contact 14, and by means of a conductive member 31 secured to the casing 6.
  • the member 31 constitutes a fixed electrode, the upper end of said member extending horizontally into the casing 29 through the end of the latter and co-operating with a fixed electrode 32 which is mounted on and extends through a partition 33 in the casing being connected with the adjacent end of the resistor 28.
  • the partition 33 defines an auxiliary chamber 34 of comparatively small volume at the left hand end of the casing 29. This chamber is connected by means of a pipe 35 with a port 21b at the throat of the casing portion 22 so that pressure conditions within the throat will be transmitted to the auxiliary chamber 34 and thereby to the gap between the electrodes 31 and 32.
  • the space within the tubular insulating casing 1 and a corresponding space within the assembly 2 is in communication, by way of the tubular insulator 3, with a control valve 37 arranged within the member 4.
  • This control valve is normally biased on to its seat 38 by means of a compression spring 39.
  • the space below the valve is connected by a pipe 40 with a source (not shown) of compressed air or gas. 41 extending in airtight manner through the end cover 42 of the member 4, which stem is connected with suitable operating mechanism adapted to open said valve when the circuit breaker is to be opened such as in response to tripping mechanism for said circuit breaker. Since such operating mechanism for the valve is well known in the art, further description thereof is deemed unnecessary herein.
  • the contact unit is provided with a terminal member 43 adapted to be connected with one supply line and a second terminal member 44 is carried 'by the member 16 for connection with the other supply line.
  • circuit-breakers of the kind described are usually employed in conjunction with an isolator switch such as in the manner shown in Fig. 2, wherein the terminal 44 constitutes a fixed contact adapted to be engaged by an isolator blade 45 which is movable into and out of engagement with the contact 44.
  • an isolator switch such as in the manner shown in Fig. 2, wherein the terminal 44 constitutes a fixed contact adapted to be engaged by an isolator blade 45 which is movable into and out of engagement with the contact 44.
  • the blade 45 is fixedly mounted on the upper end of an insulating pillar 46 mounted for ro-
  • the valve 37 includes a stern tation about its vertical axis on a member 47', the blade having electrical contact with a terminal member 44' adapted to be connected with the second mentioned supply line and having a pivotal connection at 45 with the blade 45 so as to permit the rotational movement of the latter, whilst the terminal member 44, remains fixed in space.
  • Member 47' together with the member 4 are mounted for example on a fixed framework 48.
  • the general arrangement of circuit-breaker shown in Fig. 2 is in itself well known to those skilled in the art, and it is therefore deemed unnecessary herein to describe the operating mechanism in detail.
  • the electrodes 31 and 32 will break down so that the resistor becomes connected effectively in parallel with the open main contacts i1 and 14-.
  • the flow of air through the throat 21a results in a drop in static pressure therein due to the increased velocity of the air at the throat, and this drop in pressure is communicated by pipe 35 to the auxiliary chamber 34 to facilitate the break down of the gap, or the arrangement may be such that the gap would not normally break down at atmospheric pressure.
  • the spacing between the electrodes may be such in relation to atmospheric pressure that at the normal line voltage the arc will not be maintained between said electrodes when the pressure in the auxiliary chamber 34 returns to normal, so that the current in the resistor 28 also is terminated. Circuit interruption may be thus completed or may be finally effected in the usual way by opening of the series isolator. Means responsive to the opening ol the isolator may be arranged also to close the main air or gas control valve 37.
  • the arrangement is generally similar to that hereinbefore described by way of example, but the lateral cylindrical part of the contact unit houses a piston which is biased by a compression spring toward the main space within the contact unit so as normally to obstruct said ports.
  • This cylinder is closed at its outer end, and said end is connected by means of a conduit with the space on the upstream side of the moving contact. Arrangements of this kind are included in the embodiments of the invention illustrated in Figs. 4 and 5.
  • Fig. 3 illustrates a circuit-breaker arrangement wherein two contact units 5A and 5B are mounted respectively on tubular insulating members 1A and 1B extending-op
  • the controlj-valve 37- This air pressure will urge the conpositely from a common conductive assembly 2 and supported therefrom on a commonvertical insulating member 3.
  • Resistors are provided at 28A and 28B in parallel with the contacts in the two units 5A and 5B respectively, theelectrodes 31A and 32A extending into the two auxiliary chambers respectively and the latter being connected respectively with the associated casings of the units 5A and 513 by means of pipes 35A and 35B.
  • the assembly 2 is modified by the omission of the end cover 16, the contact 14 of Fig. 1 being duplicated within the tubular member 1B and the two fixed contacts being suitably supported such as by a spider member within the assembly 2.
  • Line terminals 43 and 44 are-mounted respectively on the two units 5A and 58, being for example connected with the line conductors directly or by means of a separate isolator switch or switches, or one terminal constituting a fixed contact of an isolator'switch such as in the arrangement of Fig. 2.
  • circuit breakers illustrated in Figs. 4 and 5 are generally of the form hereinbefore described with reference to Fig. l, the same reference numbers denoting like parts on the same figures but includes provision in accordance with U. S. application Serial No. 489,564, now Patent No. 2,7 94,886, as will hereinafter be indicated.
  • the assembly 2 is also mounted on a tubular supporting insulator such as 3 of Fig. l, but not shown in Figs. 4 and 5, which insulator is secured to a member which in turn is suitably mounted such as on a main frame-work or base of the circuit and includes a normally closed control valve (37, Fig. 1) which is opened in order to place the space within the member in communication with a reservoir or other source of pressure air when it is required to open the circuit breaker.
  • a normally closed control valve 37, Fig. 1
  • the chamber 34 is connected by means of a short pipe 1% with the inlet port 101 of a vacuum ejector comprising a casing M32 having mounted therein a venturi 103, with which is connected an air supply conduit 104 extending from a passage 105 in the casing 6 on the upstream side of the main contacts and thereby communicating with the pressure air within the member 1.
  • the discharge port 196 of the ejector is connected by means of a conduit 3.87 extending to a further cylindrical portion 21 of the assembly 5.
  • the portion 21 forms a discharge passage from the main contacts and is provided with a plurality of outlet ports, such as 22, which ports are however normally closed, in accordance with U. S. application Serial No. 489,564, new Patent No. 2,794,886,, aforesaid, by means of a piston 23 which is movable in the cylinder 21 and is biased upwardly by means of a compression spring 24.
  • the upward movement of the piston 23 is limited by a shoulder at 25 to a-position wherein said piston closes the ports 22.
  • the outer end of the cylinder 21 is connected by a pipe 26 with a port '27 in the cylinder 10, the arrangement being such that whereas in the illustrated open position of the contact ll the piston 13 is to the left-hand of said port, in the normal circuit-closed position of said contact 11 the port 27 will be closed by the piston 13 against how of air from the-member 1 into the pipe 26.
  • the space in the cylinder in the rear of piston 13 is vented to the atmosphere by a passage 20.
  • conduitlltlfl provided according to the present invention, is formed with a down-turned end 108 within the portion '21.
  • the contact'unit 5 is adapted to be connected with one supply line and the member 16 with the other supply line.
  • circuit-breakers of the kind described are usually employed in conjunction with an isolator switch and may be arranged in the manner fully hereinbefore described with reference to Figs. 2
  • pressure air or gas flows through the port and conduit 104 to the ejector and entrains air from the chamber 34 whereby to reduce the air pressure within said chamber substantially below atmospheric pressure and facilitate breakdown of the gap between electrodes 31 and 32.
  • the pressure air and the entrained air is discharged from the ejector through the conduit 107 and the outlet ports 22.
  • valve 37 In order to reclose the circuit the valve 37 (see Fig. .1) is closed and an exhaust valve, the head of which is shown at 3% in Fig. 1, is opened to connect the contact chamber with .atmosphere.
  • circuit interrupter includes a series isolator as part thereof, such as in the arrangement of Fig. .-21for example, means responsive tothe opening of the isolator may be arranged also to open the exhaust :valve zwhereby to release the air or gas pressure maintained at'this stage within the contact unit.
  • the main contacts 11 and 14 of Fig. 1 will then reclose.
  • automatic reclosing operation can be provided by the usual means which, however, in application to the arrangement above described will be arranged to release the air pressure from the contact unit, namely by opening suitable exhaust valve means, as well as by closing the main air or gas control valve.
  • the vacuum ejector is arranged directly within the discharge passage of the cylindrical part 21.
  • the conduit 190 is extended from the chamber 34 to said cylindrical portion and communicates with the inlet port of a. tubular ejector body 110 which is secured within said cylinder 23 on the downstream side of the main contacts.
  • This body is provided with an end member 111 of disc form completely closing the passage through the cylinder 21 except for a central orifice which is formed as a venturi 112.
  • the body 11h is provided with an outlet venturi 115. The lower end of this outlet venturi is positioned so as to be engaged by the upper end of the piston 23 in the uppermost position of the latter.
  • the outlet venturi 113 is eventually closed when the piston 23 rises and the air under pressure within the chamber 6 then flows upwardly through the conduit 1% into the auxiliary chamber 34 so that the air pressure therein is increased and the resistor current interrupted.
  • the air pressure at the resistor electrodes is initially reduced considerably below the atmospheric pressure so as to provide a'lower (ii-electric strength between the electrodes whereby the latter will breakdown rapidly following a current interruption by the main contacts, and subsequently the di-electric strength of said gap is increased by the application thereto of an air at a pressure above atmospheric to facilitate interruption of the resistor current.
  • the effectiveness of the auxiliary gap in interrupting the resistor current is dependent upon the ratio of the minimum and maximum air pressures at which said gap is operated, and the invention enables a large increase in said ratio to be obtained. For example in one embodiment, said ratio is increased in the order of 3.4 times by means of the invention.
  • a gas blast electric circuit interrupter having main circuit breaker contacts, a chamber around said main contacts, means for supplying gas under pressure to said chamber for opening said main contacts and for extinguishing the arc therebetween, a circuit in parallel with said main contacts comprising a resistance and a gap in series, and means responsive to flow of gas through the gap between said main contacts in open circuit position for reducing the pressure in said series gap whereby breakdown thereof is facilitated.
  • a gas blast electric circuit interrupter having main circuit breaker contacts, a chamber around said main contacts, means for supplying gas under pressure to said chamber for opening said main contacts and for extinguishing the arc therebetween, a circuit in parallel with said main contacts comprising a resistance and a gap in series, means comprising a discharge port in said main contact chamber providing for the flow of gas therefrom, and means responsive to flow of gas from said main contact chamber on application of gas pressure thereto by said gas supply means for reducing the pressure in said series gap whereby breakdown thereof is facilitated.
  • a gas blast electric circuit interrupter having main circuit breaker contacts, a chamber around said main contacts, means for operating said main contacts and for supplying gas under pressure to said main contact chamher, a circuit in parallel with said main contacts comprising a resistance and a gap in series, and means providing for the flow of gas from said main contact chamber and for reducing the pressure in said series gap wherebrcakdown of said series gap is facilitated.
  • a gas blast electric circuit interrupter having main circuit breaker contacts, a chamber around said main contacts, means for operating said main contacts and for suppiying gas under pressure to said main contact chamher, a circuit in parallel with said main contacts comprising a resistance and a gap in series, means comprising a discharge port providing for the flow of gas from said main contact chamber, and means responsive to fiow of gas from said main contact chamber for reducing the pressure in said series gap whereby breakdown of said series gap is facilitated.
  • a gas blast electric circuit interrupter having main circuit breaker contacts, a chamber around said main contacts, means for operating said main contacts and for supplying gas under pressure to said main contact chamber, a circuit in parallel with said main contacts comprising a resistance and a gap in series, means providing for the flow of gas from said main contact chamher through the gap between said main circuit breaker contacts in open circuit position, and ejector means connected to said main contact chamber for reducing the pressure in said series gap whereby breakdown of said seies gap is facilitated.
  • valve means comprise a gas discharge port in said main contact chamber and a piston member movable Within said main contact cham her and adapted to open and close said gas discharge port.
  • a gas blast electric circuit interrupter comprising in combination, main circuit interrupting contacts, a chamber around said main or ntacts, means for supplying gas under pressure to said main contact chamber, a resistor and a pair of fixed electrodes connected in series in a circuit in parallel with said main contacts, said electrodes being separated by a gap which breaks down and permits passage of current through the resistor on opening of said main contacts, a pressure retaining chamber surrounding both of said electrodes, and means providing for flow of gas from said main contact chamber operative on opening of said main circuit interrupting contacts for extinguishing the arc therebetween and decreasing the static pressure on said electrodes and the gap therebetween whereby breakdown of the gap is facilitated.
  • a gas blast electric circuit interrupter comprising in combination, main circuit interrupting contacts, a chamber around said main contacts, a resistor and a pair of fixed electrodes connected in series in a circuit in parallel with said main contacts, said electrodes being separated by a gap which breaks down and permits passage of current through said resistor on opening of said main contacts, a pressure retaining chamber having a gas inlet and outlet means and surrounding the gap ends of said electrodes, means for supplying gas under pressure to said main contact chamber, means providing for flow of gas from said main contact chamber operative on opening of said main circuit interrupting contacts for extinguishing the arc therebetween and decreasing the static pressure on said electrodes and the gap therebetween whereby breakdown of the gap is facilitated, and means providing for the flow of gas under pressure into said electrode chamber operative following a time delay after opening of said main circuit interrupting contacts for increasing the static pressure on said electrodes and the gap therebetween and quenching the arc in the latter by said increase of static pressure whereby the flow of current through said resistor is terminated.
  • valve means comprise a gas discharge port in said main contact chamber and a piston member movable within said main contact chamber and adapted to open and close said gas discharge port.
  • a gas blast electric circuit interrupter as claimed in claim 1.5 in which valve means are provided operative after opening of said main circuit interrupting contacts for closing said electrode chamber gas outlet means.
  • valve means comprise a gas discharge port in said main contact chamber and a piston member movable within said main contact chamber and adapted to open and close said gas discharge port.

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US566973A 1954-11-24 1956-02-21 Electric circuit breakers of the air or gas-blast type Expired - Lifetime US2833896A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB338605X 1954-11-24
GB341875X 1955-02-23
GB101155X 1955-11-10
GB111155X 1955-11-11

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US2833896A true US2833896A (en) 1958-05-06

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US (1) US2833896A (fr)
BE (2) BE543067A (fr)
CH (2) CH338605A (fr)
DE (2) DE1052117B (fr)
FR (2) FR1140438A (fr)
GB (2) GB824103A (fr)
NL (1) NL100927C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087035A (en) * 1959-03-20 1963-04-23 Asea Ab Fluid operated circuit breaker
US3500009A (en) * 1967-02-24 1970-03-10 Gen Electric High voltage circuit breaker with means for preinserting resistors during closing

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3114815A (en) * 1959-11-18 1963-12-17 Westinghouse Electric Corp Fluid-blast circuit interrupter with improved current-transformer housing means
DE1163940B (de) * 1960-02-25 1964-02-27 Asea Ab Druckluftschalter mit reihengeschalteter Trennstelle in einer Durchfuehrung
DE1191015B (de) * 1961-06-26 1965-04-15 Asea Ab Druckluftschalter mit Daempfungswiderstand
DE1215240B (de) * 1962-08-30 1966-04-28 Bbc Brown Boveri & Cie Druckgasschalter mit Mehrfachunterbrechung
CH410112A (de) * 1964-08-21 1966-03-31 Bbc Brown Boveri & Cie Druckgasschalter
US3267241A (en) * 1964-10-05 1966-08-16 Gen Electric Multiple break high voltage circuit breaker with variable length gap control means
GB1257603A (fr) * 1970-02-24 1971-12-22

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391826A (en) * 1942-07-30 1945-12-25 Vickers Electrical Co Ltd Fluid blast circuit breaker
US2453555A (en) * 1943-09-11 1948-11-09 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2581822A (en) * 1948-07-23 1952-01-08 Bbc Brown Boveri & Cie Gas blast circuit breaker having parallel connected impedance
US2596254A (en) * 1945-03-08 1952-05-13 Latour Andre Compressed air switch with delayed break connector
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance
US2794886A (en) * 1954-03-02 1957-06-04 British Thomson Houston Co Ltd Electric circuit breakers of the air or gas-blast type

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH276833A (de) * 1947-05-15 1951-07-31 Usines Tchecoslovaques Metallu Druckluftschalter mit Trennschalter.
BE506351A (fr) * 1950-10-13

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2391826A (en) * 1942-07-30 1945-12-25 Vickers Electrical Co Ltd Fluid blast circuit breaker
US2453555A (en) * 1943-09-11 1948-11-09 Bbc Brown Boveri & Cie Gas blast circuit breaker
US2596254A (en) * 1945-03-08 1952-05-13 Latour Andre Compressed air switch with delayed break connector
US2581822A (en) * 1948-07-23 1952-01-08 Bbc Brown Boveri & Cie Gas blast circuit breaker having parallel connected impedance
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance
US2794886A (en) * 1954-03-02 1957-06-04 British Thomson Houston Co Ltd Electric circuit breakers of the air or gas-blast type

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087035A (en) * 1959-03-20 1963-04-23 Asea Ab Fluid operated circuit breaker
US3500009A (en) * 1967-02-24 1970-03-10 Gen Electric High voltage circuit breaker with means for preinserting resistors during closing

Also Published As

Publication number Publication date
CH338605A (fr) 1959-05-31
BE545466A (fr) 1956-03-15
NL204840A (fr) 1961-11-15
NL100927C (fr) 1962-04-16
GB824103A (en) 1959-11-25
BE543067A (fr) 1955-12-15
DE1052117B (de) 1959-03-05
DE1025485B (de) 1958-03-06
CH341875A (de) 1959-10-31
FR1140438A (fr) 1957-07-22
GB826463A (en) 1960-01-06
FR1146202A (fr) 1957-11-07

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