US3582589A - Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means - Google Patents

Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means Download PDF

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Publication number
US3582589A
US3582589A US701771A US3582589DA US3582589A US 3582589 A US3582589 A US 3582589A US 701771 A US701771 A US 701771A US 3582589D A US3582589D A US 3582589DA US 3582589 A US3582589 A US 3582589A
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United States
Prior art keywords
movable
stationary
fluid
contact
accelerating
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Expired - Lifetime
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US701771A
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English (en)
Inventor
Russell E Frink
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CBS Corp
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Westinghouse Electric Corp
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Publication date
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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
    • H01H33/882—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 the movement being assisted by accelerating coils

Definitions

  • a fluid-blast piston-type circuit interrupter utilizes two stationary accelerating coils and one moving accelerating coil carried by a fluid-driving piston assembly. During the opening operation, the series fault current is inserted serially into the three accelerating coils, and their magnetic attraction and repulsion forces assist the operating mechanism to move the fluid-driving piston assembly, and thereby to drive fluid, such as sulfur-hexafluoride (SF gas, through the established arc drawn within an orifice member to effect its extinction.
  • fluid such as sulfur-hexafluoride (SF gas
  • a suitable operating mechanism initially causes motion of the piston assembly and the driver unit, which upon initial arc establishment inserts the three accelerating coils serially into the electrical circuit; and their repulsion and attraction forces assist the operating mechanism in effecting fast fluid-driving motion of the piston assembly.
  • an insulating cylinder is provided, and two stationary accelerating coils are fixed in relation thereto.
  • An internally movable piston assembly carrying the movable contact structure and a movable accelerating coil, is adapted for reciprocal movement with the contact arrangement so arranged as to insert, during the opening operation, the three accelerating coils into the series electrical circuit. Due to the attractive and repulsive magnetic forces set up by the several coils, the piston assembly is assisted in its opening fluid-driving motion, thereby minimizing the operating requirements imposed upon the adjacent operating mechanism.
  • This invention relates, generally, to circuit interrupters, and more particularly to circuit interrupters of the fluid-blast type having a piston assembly associated therewith for generating fluid under pressure to be forced into the established arc to effect the extinction thereof.
  • the outer heavy metallic grounded housing as utilized in the construction of the aforesaid patent application, is eliminated.
  • Still a further object of the present invention is the provision of an improved fluid-blast circuit interrupter of simple construction, and providing a worthwhile reduction in the moving mass of the moving partsfwhich will permit faster interrupting times and reduce the mechanism requirements.
  • Still a further object of the present invention is the provision of an improved simplified-type magnetic puffer-type interrupter, in which the use of two stationary accelerating coils, and only a single moving coil moving with the piston assembly, results in a simpler coil connections and a highly effective coiltransfer arrangement.
  • FIG. 1 is a perspective view in side elevation of a fluid-blast circuit interrupter embodying the principles of the present invention
  • FIG. 2 is a longitudinal vertical sectional view taken through the interrupting assembly of FIG. 1, substantially along the line 11-11 of FIG. 3, the contact structure being illustrated in the closed-circuit position;
  • FIG. 3 is a longitudinal sectional view taken through the interrupting unit of FIG. 2, substantially along the line 111-111 of FIG. 2, again the contact structure being illustrated in the closed-circuit position;
  • FIG. 4 is a view similar to that of FIG. 2, but illustrating the disposition of the several parts during the opening operation, when arcing occurs;
  • FIG. 5 is a horizontal sectional view taken substantially along the line VV of FIG. 2;
  • FIG. 7 illustrates, in perspective, the general arrangement of the two stationary accelerating coils and the coil connections therefore.
  • FIG. 8 is a diagrammatic view of the electrical connections for the circuit interrupter.
  • the reference numeral 1 generally designates a magnetic-type fluid-blast circuit interrupter.
  • the circuit interrupter 1 has end terminal pad portions 2, 3, to which line connections L,, L are attached.
  • a composite insulating inter rupter casing 4 is provided.
  • Supporting insulators 5,6 insulatingly support the interrupting assembly laterally an adequate voltage-withstanding distance from a grounded supporting framework 7, comprising structural steel angle members 8, 9, and vertical braces 12, 13.
  • a mechanism 14 is provided to effect opening and closing rotative movement of an external operating crank 15, as more fully described hereinafter.
  • the interrupting unit is housed within an insulating composite cylinder 4.
  • the stationary magnetic coils 17, 18 are made from edge-wound copper strap, for example, to which tapped terminal blocks are brazed, or otherwise affixed.
  • the coils 17, 18 after winding and brazing the terminals, are taped over the individual turns with mica tape, for example; and each entire coil 17 or 18 is then compressed and taped, as a unit, with Dacron tape, for example, and the coil impregnated with epoxy resin.
  • the two coils 17, 18 are then positioned over the tube 4a and held in place with wedges (not shown) of the same material, as is used in the outer tube 4b.
  • Terminals are then bolted to the coil-terminal blocks with the tabs of connectors extending into the inner volume or interior of the operating cylinder 4 through slits 23 provided in the tube wall 4a.
  • Tight fitting, lubricated mandrels (not shown) are then placed inside the tube 4a from either end, and meeting at the position of the connectors.
  • a split mold is then placed around this assembly, and the housing 4 is cast by conventional epoxy casting techniques.
  • terminal members Attached to both ends of the cylindrical housing 4 by bolts 24, threaded into metal inserts 25 are the terminal members, or end casting portions 26, 27. These terminal members ex tend a short distance into the cylindrical housing, and are sealed by O-rings 28. Attached to terminal member 26 by sealed bolts 29 is the Ushaped stationary conductor 31. Brazed to the open end of the U member 31 are sections 33 of extruded copper, for example, which act as pivots for reverseloop fingers 34. The fingers 34 are biased inwardly by springs 35 (FIG. 3) and are restrained by clips 36. Attached to the extruded sections 33 by bolts 37 (FIG.
  • the movable piston assembly 43 is built on a molded disc 54 of insulating material, which fits closely within the internal diameter of tube 4, gas leakage being kept low by the piston ring 55. Threaded into the piston are guide rods 56, 57, which are secured into position by jam nuts 58.
  • the movable piston accelerating coil 60 has its terminals 61, 62 maintained in contact with the movable guide rods 56,57 by metallic spacers 63 and nuts 64.
  • the tubular moving main contact member 66 has brazed to it a metallic spider 67, which is attached to the movable piston 43 by bolts 68 FIG. 6. Nested within a cavity 69, provided in the movable piston member 54 and resting upon spider 67, is a stack of cooling screens 70.
  • a retaining member 71 which has suitable apertures 71a provided therein, compresses the stack of screens 70 and is held into position by the insulating movable gas-flow guide tube 72.
  • the entire assembly is held together by the insulating cover plate 74, which is secured by spider bolts 68 and clevis bolts 77.
  • the main movable contact tube 66a extends through an opening 78 (FIG. 2) in the stationary end plate 39, gas leakage being deterred by a sealing ring 8].
  • Threaded to the main movable contact tube 66a is a movable contact member 83, which is elongated in one direction to make contact with the stationary contact fingers 34 when the breaker 1 is in the closed-circuit position, as illustrated in FIGS.
  • movable arcing contact tube 85 Concentrically located with respect to the movable main contact tube 66 is the movable arcing contact tube 85, which is positioned at its lower end by an insulator 87 and at its upper end by an insulating strip 88, which is bolted to contact member 83 by bolts (not shown).
  • the insulating strip 88 is also attached to the guide rods 56, 57 by jam nuts 90.
  • the movable arcing contact tube a is connected to guide rod 56 by conducting strap 92.
  • the guide rod 57 passes through a sliding ball contact 94 (FIG. 2), which is set forth and claimed in U.S. Pat. No. 3,301,986 issued to Russell E. Frink, Jan. 31, 1967, and assigned to the assignee of the instant application.
  • the ball contact 94 is electrically connected to the terminal strap 95 (FIG. 2) of the stationary accelerating coil 17.
  • the terminal strap 96 of stationary accelerating coil 17 is bolted, as at 97, to an extension 98 of one of the extruded sections 33.
  • the stationary contact member 100 is clamped to a stationary conducting casting 101, which is bolted to the end casting 27 by bolts 102.
  • the external circuit connections L,, L to the interrupter are through the terminal pads 2, 3 and the interrupter is supported by the grounded metallic framework 7 (FIG. I), which is secured to the supporting insulators, as previously described.
  • This new are position 113a is shown in FIG. 4.
  • the current path is now line connection L end casting 26, stationary contact 33, terminal strap 96, stationary accelerating coil 18 (FIG. 7), coil connection 119, stationary accelerating coil 17, coil terminal 95, ball contact 94, conducting guiderod 57, coil connection 62, movable accelerating coil 60, movable coil terminal 61, conducting guide rod 56, conducting strap 92, movable arcing tube 85a, movable arcing contact 85, the are 113 (FIG.
  • circuit interrupter 1 of highly effective operation, and utilizing a minimum amount of mass in the moving parts.
  • the construc tion is particularly suitable for the lower voltage ratings, as, for example 23 KV up through 34.5 KV, it will be apparent that certain of the broader features of the invention may be applied to circuit interruptcrs of the magnetic puffer-type, for the higher voltage ratings.
  • a very important feature of the invention is the utilization of the fault current energy for assisting the operation mechanism 14 in moving the piston assembly 43 in a fluid-driving direction, and thereby ensuring an adequate gas flow during heavy arcing conditions by the increased magnetic effect exerted by the three accelerating coils.
  • FIG. 8 diagrammatically illustrates, generally, the moving contact structure and coil connections for the circuit interrupter.
  • the mechanism 14 functions to move the moving contact assembly 66 and the piston assembly 43 downwardly to cause contact reclosure to the closed circuit position illustrated in FIGS. 2 and 3 of the drawings.
  • a fluid-blast piston-type circuit interrupter including, in combination:
  • relatively movable contact structure including a main movable contact and a movable arcing contact insulated therefrom
  • fluid-directing means for directing fluid compressed by the piston action into the transferred arc to effect extinction thereof and thereby effect circuit interruption
  • fluid-directing means comprises an insulating nozzle movable with the movable piston member and encompassing at least a portion of the stationary contact structure.
  • a fluid-blast piston-type circuit interrupter including, in combination:
  • a stationary main contact disposed adjacent the first end of said operating cylinder
  • a movable contact structure and piston assembly mechanically connected together and arranged to move as a unit
  • operating means connected to said piston assembly and functioning to effect opening and closing movement thereof reciprocally within said stationary operating cylinder
  • said movable contact structure comprising a movable main contact and a movable auxiliary contact electrically connected together and respectively engaging and disen gaging the stationary main contact and the stationary auxiliary contact,
  • said movable assembly further comprising a third driving coil and a movable arcing contact

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  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US701771A 1968-01-30 1968-01-30 Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means Expired - Lifetime US3582589A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US70177168A 1968-01-30 1968-01-30

Publications (1)

Publication Number Publication Date
US3582589A true US3582589A (en) 1971-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
US701771A Expired - Lifetime US3582589A (en) 1968-01-30 1968-01-30 Fluid-blast circuit interrupter with piston assembly and electromagnetic driving means

Country Status (6)

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US (1) US3582589A (de)
JP (1) JPS5120700B1 (de)
BE (1) BE727634A (de)
CH (1) CH485315A (de)
DE (1) DE1815721A1 (de)
FR (1) FR2000977A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745281A (en) * 1970-02-20 1973-07-10 Hitachi Ltd Gas-blast circuit breaker having a floating puffer piston driven by electromagnetic force
US3763341A (en) * 1970-05-27 1973-10-02 Clymer F Switching system
US4011421A (en) * 1974-08-14 1977-03-08 Sprecher & Schuh Ag Gas-blast switch
US4105879A (en) * 1976-03-12 1978-08-08 Hitachi, Ltd. Magnetic puffer type gas circuit breaker
US4289942A (en) * 1977-07-29 1981-09-15 Westinghouse Electric Corp. Gas-blast circuit-interrupter with multiple insulating arc-shield construction
US11211207B2 (en) * 2019-07-17 2021-12-28 Schneider Electric Industries Sas Architecture for an electrical switching device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH558079A (de) * 1973-05-10 1975-01-15 Bbc Brown Boveri & Cie Druckgasschalter.

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913556A (en) * 1956-03-14 1959-11-17 Westinghouse Electric Corp Circuit interrupters
US3164703A (en) * 1959-09-15 1965-01-05 Westinghouse Electric Corp Circuit interrupter of the single-bushing type with canted terminal-bushing construction
DE1190079B (de) * 1963-03-28 1965-04-01 Siemens Ag Elektrischer Schalter
US3214550A (en) * 1962-05-02 1965-10-26 Westinghouse Electric Corp Circuit interrupters with crossbars captively related to piston structures
DE1206056B (de) * 1963-09-12 1965-12-02 Siemens Ag Elektrischer Schalter
US3238340A (en) * 1961-08-25 1966-03-01 Sprecher & Schuh Ag Gas-blast circuit breaker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2913556A (en) * 1956-03-14 1959-11-17 Westinghouse Electric Corp Circuit interrupters
US3164703A (en) * 1959-09-15 1965-01-05 Westinghouse Electric Corp Circuit interrupter of the single-bushing type with canted terminal-bushing construction
US3238340A (en) * 1961-08-25 1966-03-01 Sprecher & Schuh Ag Gas-blast circuit breaker
US3214550A (en) * 1962-05-02 1965-10-26 Westinghouse Electric Corp Circuit interrupters with crossbars captively related to piston structures
DE1190079B (de) * 1963-03-28 1965-04-01 Siemens Ag Elektrischer Schalter
DE1206056B (de) * 1963-09-12 1965-12-02 Siemens Ag Elektrischer Schalter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3745281A (en) * 1970-02-20 1973-07-10 Hitachi Ltd Gas-blast circuit breaker having a floating puffer piston driven by electromagnetic force
US3763341A (en) * 1970-05-27 1973-10-02 Clymer F Switching system
US4011421A (en) * 1974-08-14 1977-03-08 Sprecher & Schuh Ag Gas-blast switch
US4105879A (en) * 1976-03-12 1978-08-08 Hitachi, Ltd. Magnetic puffer type gas circuit breaker
US4289942A (en) * 1977-07-29 1981-09-15 Westinghouse Electric Corp. Gas-blast circuit-interrupter with multiple insulating arc-shield construction
US11211207B2 (en) * 2019-07-17 2021-12-28 Schneider Electric Industries Sas Architecture for an electrical switching device

Also Published As

Publication number Publication date
CH485315A (de) 1970-01-31
FR2000977A1 (de) 1969-09-19
DE1815721A1 (de) 1969-08-07
BE727634A (de) 1969-07-30
JPS5120700B1 (de) 1976-06-26

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