US3164706A - Mechanical operating means for fluidblast circuit interrupter - Google Patents

Mechanical operating means for fluidblast circuit interrupter Download PDF

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Publication number
US3164706A
US3164706A US149951A US14995161A US3164706A US 3164706 A US3164706 A US 3164706A US 149951 A US149951 A US 149951A US 14995161 A US14995161 A US 14995161A US 3164706 A US3164706 A US 3164706A
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US
United States
Prior art keywords
movable
contact
cylinder
fluid
operating
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
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US149951A
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English (en)
Inventor
Frederick B Johnson
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.)
Westinghouse Electric Corp
Original Assignee
Westinghouse Electric Corp
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Filing date
Publication date
Priority to BE624218D priority Critical patent/BE624218A/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US149951A priority patent/US3164706A/en
Priority to GB40713/62A priority patent/GB972059A/en
Priority to FR914239A priority patent/FR1337744A/fr
Application granted granted Critical
Publication of US3164706A publication Critical patent/US3164706A/en
Priority to JP1965071931U priority patent/JPS4033942Y1/ja
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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/88—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts
    • H01H33/90—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism
    • H01H33/904—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being produced or increased by movement of pistons or other pressure-producing parts this movement being effected by or in conjunction with the contact-operating mechanism characterised by the transmission between operating mechanism and piston or movable contact

Definitions

  • a more specific object of the present invention is to provide an improved operating linkage for a pot-type fluid-blast circuit interrupter in which the rate of travel of one of the operating elements of the puffer structure may be controlled in a desired manner.
  • Still a further object of the present invention is the provision of an improved fluid-blast putter-type circuit interruplter utilizing a fluid-exhaust orifice, in which the mechanism interconnecting the two move able parts of the puffer structure is of a simple construction, may be easily adjusted and requires a minimum of space.
  • the present invention is concerned with the provision of an improved puffer structure in whch a pivotallymounted operating lever is linked to both the movable contact rod and to one of the movable elements of the puffer structure.
  • the contact rod not only responds to the opening and closing movement of the movable contact, but also is linked to the other movable part of the piston structure so that during the opening operation of the interrupter, the two movable parts of the piston structure are moved toward each other in opposite directions to very quickly compress the compressible volume enclosed in the movable operating cylinder of the puffer device.
  • the movable contact rod may move either the operating cylinder or the orifice structure, and the pivotally-mounted operating lever, actuated by the contact rod, causes the actuation of the other moveable part of the puffer structure, namely the interiorly disposed piston or the movement of the surrounding operating cylinder.
  • FIGURE 1 is an end elevational View of a three-phase fluid-blast circuit interrupter of the puffer-type embodying principles of the present invention
  • FIG. 2 is a side elevational view of the three-phase circuit interrupter of FIG. 1;
  • FIG. 3 is an enlarged cross-sectional view taken through one of the three interruptingassemblies of the circuit interrupter of FIGS. 1 and 2, illustrating the interconnecting linkage, and the parts being shown at an intermediate point n the opening operation;
  • FIG. 3A is a sectional view taken along the line I-I of FIG. 3;
  • FIG. 4 is an enlarged detailed view of the operating linkage of the puffer structure
  • FIG. 5 is a graph indicating different pivot locations to obtain different travel curves of the piston
  • FIGS. 5A, 5B and 5C diagrammatically represent different pivot locations indicated by the graph of FIG. 5;
  • FIG. 6 illustrates a modified form of the invention indicating how the parts may be interchangeable while retaining the simplified linkage
  • FIG. 7 is a sectional view taken substantially along the line VIIVII of FIG. 4.
  • the reference numeral 1 generally designates a three-phase fluid-blast circuit interrupter.
  • the circuit interrupter 1 includes three interrupting assemblies A, B, C, each of which controls one of the phases.
  • the interrupting assemblies A, B, C are supported up in the air upon a suitable supporting framework 2 by uprights 4. Braces 5 and 6 extend transversely between the uprights 4 and maintain a rigid structure.
  • a mechanism compartment 7 is provided enclosing a suitable operating mcchanism, which may be of the pneumatic or solenoid actuated type. Briefly, the mechanism, disposed within the mechanism compartment 7 functions to cause closing of the contact structure 8 (FIG.
  • Each pole-unit A, B or C includes a housing structure generally designated by the reference numeral 12.
  • the housing structure comprises a pair of oppositely extending insulating cylinders 12 and an intervening grounded metallic support cylinder 12b.
  • a suitable gas under pressure such as sulfur hexafluoride SP gas, may be contained within the housing 12.
  • Current transformers 3 may be provided, as shown.
  • the rotatable crank-shaft 9 extends through a tube 13 extending transversely of the pole-units A, B, C, and is connected to each of the pole-unit assemblies by a bifurcated drive lever 14, the configuration of which is more readily apparent from an inspection of FIG. 3A of the drawings.
  • the furcations 15, 16 of the bifurcated drive lever 14 make pivotal connection to pivot pins 17 extending laterally from links 18, in turn pivotally connected, as at 19, to trunnions extending later-ally of a movable pufier cylinder 20.
  • a movable piston 21 pivotally connected, as at 22, to a floating link 23, the right-hand end of which is pivotally connected, as at 24, to a rotatable operating lever 25.
  • the rotatable operating lever 25 is pivotally mounted intermediate its ends on stationary trunnion pins 26 (FIG. 7).
  • the upper arm 27 of the rotatable operating lever 25 is pivotally connected, as at 28, to a floating link 29, in turn connected, as at 30, to a boss portion 31 of the movable contact rod 32.
  • the relatively stationary contact is supported, as by a threaded engagement 35, to a terminal plate 3-5. Consequently, in the closed-circuit position of the device, not shown, the electrical circuit therethrough includes line connection L left-hand terminal plate 36, relatively stationary contact 10, movable contact 11, movable contact guide rod 32, flexible fingers 33 to terminal plate 34 and hence to the other line connection L
  • puffer devices utilized in conjunction with the contact structures of circuit interrupters are effective to cause a blast of arcextinguishing fluid, such as compressed gas, oil, etc. adjacent the established arc to quickly effect the extinction thereof.
  • arcextinguishing fluid such as compressed gas, oil, etc.
  • the amount of gas that can be moved through the orifice is limited to that trapped inside the cylinder at the start of a movement.
  • Rate of gas flow neglecting compression, bears a linear relation to contact motion and may not be at the most efiicient rate as far as effective circuit interruption is concerned.
  • the putfer structure 33 increases the amount of gas flow without increasing the size of the cylinder or the length of the stroke. This is done by dividing the stationary piston and guide assembly into As shown in FIG. 3, the left-hand part becomes a movable piston 21 which is caused to move in a direction opposite to that of the moving cylinder 2 thereby increasing the relative movement of the two, and correspondingly increasing the amount of gas blown through the interrupter.
  • the right-hand part of this assembly 41 remains stationary and serves the function of guiding movement of the cylinder and contact assembly.
  • FIG. 4 shows a suggested linkage for driving the movable piston 21. It consists of an operating lever 25 pivoted at an intermediate point 2-6 to the stationary guide assembly 41, and two links 23, 29, one pivoted to each end of the lever 25.
  • the link 29 at the upper end is connected to the conductor bar 32 which is part of a moving contact assembly and moves with it.
  • the bottom floating link 23 is connected to the piston 21 and imparts motion to it in a direction opposite to that of the contact motion. It is obvious that other linkage mechanisms might be used to produce this desired counter-movement between the moving cylinder 20 and the moving piston 21.
  • FIGS. 5A, 5B and 5C show, schematically, three such lever-arm arrangements; and the piston travel curves that will be obtained with each plotted as a function of the main cylinder travel in the graph of FIG. 5.
  • Curve A shows an essentially linear relationship between the two travels which is obtained when the three pin centers are in line with each other.
  • Curve B shows an increased rate of travel in the latter part of the travel, and curve C shows that it is even possible to obtain reversed travel of the movable piston 21 at the start with a maximum rate at the full open position. It should be remembered that these travels and accompanying gas flow will be superimposed on the moving cylinder travel and flow, which will always be a straight-line function, neglecting gas compression.
  • this mechanism requires the movement of additional parts as compared to the conventional design. However, the weight of these parts would be appreciably less than that of a larger cylinder that would give comparable gas movement. Also with the same size piston 21, the increased gas flow is obtained without the necessity of increased acceleration of all other moving parts as would be required if the longer stroke method were used. The net result is increased gas flow with relatively little increase in required accelerating forces.
  • FIG. 6 illustrates a modification of the puffer structure 38 in which the parts are interchanged.
  • the operating cylinder 20a is connected by a cylinder head 43 to a boss portion 44, which is linked, as at 45, to a floating link 46.
  • the right-hand end of the floating link 46 is pivotally connected, as at 47, to the operating lever 25a.
  • the upper end of the operating lever 25a is pivotally connected, as at 49, to a floating link 50, the latter pivotally connected, as at 51, to a boss portion 52 of the movable contact rod 32a.
  • eration is the same as in the FIG. 3 arrangement, namely the operating cylinder 20a and the orifice structure 39a moving in opposite directions to quickly effect compression of the compressible gas disposed within the region 37 of the puffer device 38.
  • the operating arrangement for the puffer device may be readily adapted to conventional type puffer structures with little addition of parts and causes their more efficient operation.
  • the utilization of the rapid operating puffer structure enables the effectiveness of the circuit interrupter 1 to be increased, particularly on linecharging interruptions or capacitor switching.
  • a circuit interrupter of the fluid-blast type including a relatively stationary contact, a movable contact separable from the relatively stationary contact to establish an arc, a movable contact rod having said movable contact aflixed thereto, operating means for eiieoting opening and closing movement of the movable contact rod for effecting corresponding contact separation and contact reengagement, puffer means for compressing fluid to effect arc extinction including a movable cylinder part and a movable piston part, the movable piston part being movable Within the movable cylinder part for the compression of an arc-extinguishing fluid therein, a mechanical linkage including a pivotally mounted operating lever mechanically interconnecting said movable contact rod with one of said movable parts, said movable contact rod being secured to the other of said movable parts, whereby said two movable parts will move in opposite directions to very rapidly decrease the compressible volume within the movable cylinder during the opening operation of the interrupter.
  • puffer means including an orifice for effecting extinction of said are by a blast of compressed arc-extinguishing fluid
  • the puffer means also including a movable piston part movable within a movable cylinder part for the compression of volume therein, said orifice secured to and movable with one of said movable parts
  • the contact means including a relatively stationary contact and a movable cooperable contact movable with a movable contact rod
  • mechanical linkage means including a pivotally mounted operating lever interconnecting said movable contact rod with one of said movable parts, means connecting the movable contact rod to the other movable part, whereby said movable parts of the putter means move in opposite directions to very rapidly compress fluid within the movable cylinder part for an arc-extinguishing blast of gas through said orifice.
  • a circuit interrupter of the fluid-blast type including a relatively stationary contact, a movable contact separable from the relatively stationary contact to establish an arc, a movable contact rod having said movable contact ailixed thereto, operating means for effecting opening and closing movement of the movable contact rod for effecting corresponding contact separation and contact reengagement, pufier means for compressing fluid to effect arc extinction including a movable cylinder part and a movable piston part, the movable piston part being movable within the movable cylinder part for the compression of an arc-extinguishing fluid therein, a mechanical linkage mechanically interconnecting said movable contact rod with one of said movable parts, said movable contact rod being secured to the other of said movable parts, said mechanical linkage including a rotatable operating lever fulcrumed about a stationary pivot, whereby said two movable parts will move in opposite directions to very rapidly decrease the compressible volume within the movable cylinder during the opening operation of
  • a circuit interrupter of the fluid-blast type including a relatively stationary contact, a movable contact carrying an orifice structure and operating cylinder, a relatively stationary guide cylinder over which said operat ing cylinder slides and having an internallydocated stationary fulcrum support means, said movable contact having a rod-like extension extending axially through said guide cylinder, operating means secured to the outer side of said operating cylinder to cause the opening and closing movement thereof, a movable piston disposed internally of said operating cylinder and cooperable therewith to compressfiuid within the operating cylinder and force the same out through the orifice structure against the arc to extinguish the same, a reversing-movement operating lever fulcrumed adjacent its mid-point to said stationary fulcrum support means, link means connecting the opposite ends of said operating lever both to said movable piston and to said rod-like contact extension, whereby opening movement of the operating cylinder as efi'ected by said operating means causes opposite movement of the operating cylinder and movable piston to rapidly

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US149951A 1961-11-03 1961-11-03 Mechanical operating means for fluidblast circuit interrupter Expired - Lifetime US3164706A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE624218D BE624218A (en, 2012) 1961-11-03
US149951A US3164706A (en) 1961-11-03 1961-11-03 Mechanical operating means for fluidblast circuit interrupter
GB40713/62A GB972059A (en) 1961-11-03 1962-10-29 Gas blast electric circuit interrupters
FR914239A FR1337744A (fr) 1961-11-03 1962-11-02 Disjoncteur à chasse de fluide
JP1965071931U JPS4033942Y1 (en, 2012) 1961-11-03 1965-09-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US149951A US3164706A (en) 1961-11-03 1961-11-03 Mechanical operating means for fluidblast circuit interrupter

Publications (1)

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US3164706A true US3164706A (en) 1965-01-05

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US149951A Expired - Lifetime US3164706A (en) 1961-11-03 1961-11-03 Mechanical operating means for fluidblast circuit interrupter

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US (1) US3164706A (en, 2012)
JP (1) JPS4033942Y1 (en, 2012)
BE (1) BE624218A (en, 2012)
FR (1) FR1337744A (en, 2012)
GB (1) GB972059A (en, 2012)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3674956A (en) * 1970-11-19 1972-07-04 Allis Chalmers Mfg Co Puffer type circuit interrupter
JPS5150468A (ja) * 1974-10-28 1976-05-04 Hitachi Ltd Patsufuagatagasushadanki
US5059753A (en) * 1987-11-06 1991-10-22 Cooper Industries, Inc. SF6 puffer recloser
JP2015023007A (ja) * 2013-07-23 2015-02-02 株式会社東芝 ガス遮断器
JP2017174834A (ja) * 2017-07-07 2017-09-28 株式会社東芝 ガス遮断器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5619306Y2 (en, 2012) * 1973-06-29 1981-05-08
JPS5067360U (en, 2012) * 1973-10-19 1975-06-17
JPS517644U (en, 2012) * 1974-07-04 1976-01-20
JPS52383A (en) * 1975-06-21 1977-01-05 Nissin Electric Co Ltd Blowwout circuit switch
JPS5222776A (en) * 1975-08-14 1977-02-21 Nissin Electric Co Ltd Blowwout circuit switch
JPH07101579B2 (ja) * 1986-03-25 1995-11-01 三菱電機株式会社 開閉器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR811554A (fr) * 1936-10-02 1937-04-17 Disjoncteur auto-pneumatique
DE663423C (de) * 1935-05-17 1938-08-05 Studiengesellschaft Fuer Hochl Leistungsschalter mit Lichtbogenloeschung durch eine Fluessigkeitsstroemung
US2781435A (en) * 1951-03-18 1957-02-12 Heilmann Philipp Arc-extinguishing mechanism for electric switches
US2913559A (en) * 1958-01-30 1959-11-17 Westinghouse Electric Corp Fluid-blast circuit interrupter
US3002129A (en) * 1958-11-28 1961-09-26 Allis Chalmers Mfg Co Counterbalanced shutter blade arrangement for enclosed switchboard structures

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE663423C (de) * 1935-05-17 1938-08-05 Studiengesellschaft Fuer Hochl Leistungsschalter mit Lichtbogenloeschung durch eine Fluessigkeitsstroemung
FR811554A (fr) * 1936-10-02 1937-04-17 Disjoncteur auto-pneumatique
US2781435A (en) * 1951-03-18 1957-02-12 Heilmann Philipp Arc-extinguishing mechanism for electric switches
US2913559A (en) * 1958-01-30 1959-11-17 Westinghouse Electric Corp Fluid-blast circuit interrupter
US3002129A (en) * 1958-11-28 1961-09-26 Allis Chalmers Mfg Co Counterbalanced shutter blade arrangement for enclosed switchboard structures

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3674956A (en) * 1970-11-19 1972-07-04 Allis Chalmers Mfg Co Puffer type circuit interrupter
JPS5150468A (ja) * 1974-10-28 1976-05-04 Hitachi Ltd Patsufuagatagasushadanki
US5059753A (en) * 1987-11-06 1991-10-22 Cooper Industries, Inc. SF6 puffer recloser
JP2015023007A (ja) * 2013-07-23 2015-02-02 株式会社東芝 ガス遮断器
JP2017174834A (ja) * 2017-07-07 2017-09-28 株式会社東芝 ガス遮断器

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Publication number Publication date
BE624218A (en, 2012)
JPS4033942Y1 (en, 2012) 1965-11-29
GB972059A (en) 1964-10-07
FR1337744A (fr) 1963-09-13

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