US3551623A - Fluid-blast circuit interrupters with piston-driving means and cooperable floating piston with accelerating coil - Google Patents

Fluid-blast circuit interrupters with piston-driving means and cooperable floating piston with accelerating coil Download PDF

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Publication number
US3551623A
US3551623A US576575A US3551623DA US3551623A US 3551623 A US3551623 A US 3551623A US 576575 A US576575 A US 576575A US 3551623D A US3551623D A US 3551623DA US 3551623 A US3551623 A US 3551623A
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United States
Prior art keywords
piston
movable
fluid
accelerating
contact
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Expired - Lifetime
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US576575A
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English (en)
Inventor
Robert G Colclaser Jr
William H Fischer
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CBS Corp
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Westinghouse Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
    • F02K9/80—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by thrust or thrust vector control
    • F02K9/805—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by thrust or thrust vector control servo-mechanisms or control devices therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/16—Systems essentially having two or more interacting servomotors, e.g. multi-stage
    • F15B9/17—Systems essentially having two or more interacting servomotors, e.g. multi-stage with electrical control means
    • 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
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main 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
    • H01H33/70—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 circuit interrupter having a movable fluid-driving piston carrying the movable con- 200/148! tact structure and, additionally, a movable accelerating coil. 335/149 An operating mechanism causes motion of this piston.
  • the -H01h 33/91 movable piston moves within an operating cylinder having a 200/1481 stationary second accelerating coil in the base portion thereof.
  • a floating piston, carrying a movable third accelerating coil is also reciprocally movable within the operating cylinder, and is 1555, 156, 1 7 307/136 magnetically repelled by the stationary accelerating coil when References Cited the three accelerating coils are inserted serially into the circuit during the opening operation.
  • the movable piston also carries an arcing horn to which the 335/148 moving terminal of the established arc is transferred by fluid 335/ 186X flow during initial motion of the moving piston.
  • This transfer 200/ 148( .1) of the arc terminal effects the series insertion of all three ac- 335/ 18X celerating coils into the circuit to reduce the force require- 200/ 148(. l ments imposed upon the operating mechanism.
  • a general object of thepresent invention is to provide an iinproved fluid-blast circuit: interrupter in which piston means, incorporating a floating pist'on having an accelerating coil car ried therewith, is utilized for very rapidly compressing the fluid within the operating cylinder chamber and sending the same toward the established arc to effect the extinction thereof.
  • Still a further object of the present invention is the provision of an improved fluid-blast circuit interrupter in which a movable piston, having an accelerating coil, is mechanically driven by-the associated'operating mechanism within an operating cylinder, the latter having a second accelerating coil associated therewith,.and in which a floating piston having a v third accelerating coil is also movable within said operating cylinder to considerably speed up the-compressing of the fluid for ejection into the established arc.
  • a stationary operating ,cylinder having an accelerating coil in the base portion thereof.
  • a movable piston-member mechanically driven by the operating mechanism, carries movable main and insulated arcing horn means, together .with an accelerating coil, the movable contact means separating from an associated stationary contact means to establish a main currentarc.
  • afluid blast causes a transfer of the main current are to the arcing horn means, which is connected in series with the accelerating coil carried by the movable piston member.
  • a floating piston is movable within the operating cylinder, and it carries a second movable accelerating coil, which is repelled by the stationary accelerating coil disposed at the base of the operating cylinder.
  • the three accelerating coils are in electrical circuit with said arcing horn means, so that upon transfer of the main current arc to' the arcing horn means, the three accelerating coils are inserted into the series circuit to thereby very rapidly cause fluid-driving movement of the floating piston in conjunction with the mechanically driven piston member.
  • a separate normally closed switch is provided to force the current to flow through the three accelerating coils, and, in this instance the arcinghorn means is electrically connected to the main movable contactstruct'ure.
  • FIG. 1 is a vertical sectional view taken through a-fluidblast circuit interrupter incorporating the principles of the present invention, the contact structure being illustrated in the closedcircuit position;
  • FIG. 2-4 are sectional'vievifs taken, respectively, along the lines 11-11, IlI-III- and lV-IV ofFIG.-l;'
  • FIG 5 isa' diagrammatic view'ii'lustrating the accelerating coil connections for the circuit interrupter of FIG. 1;
  • FIG. 6 illustrates diagrammatically a further 'modifled .type of fluid-blast circuit interrupter in which a separate switch is employed to force the current flow through the accelerating coils, the structure, with the exception of the circuit connections, being identical to that set forth in FIG. I, again the contact structure being illustrated in the closed-circuit position,
  • the reference numeral 1 generally designates a fluidblast circuit interrupter.
  • the fluid-blast circuit interrupter 1 comprises an upstanding insulating casing 2 formed of a suitableweatherprjoof material, such as porcelain,.for example, having a pair of flange rings 3, 4 cemented to theupper and lower ends thereof.
  • a suitableweatherprjoof material such as porcelain,.for example, having a pair of flange rings 3, 4 cemented to theupper and lower ends thereof.
  • an upper conducting line terminal cap 8 Secured, as by a plurality of bolts ,7, is an upper conducting line terminal cap 8 having.
  • a line connection 9 which is connected to the external lead L
  • a stationary tubular vented contact designated by the referencev numeral 10
  • a plurality of main movable contact fingers 11 which constitute a part, of a movable contact structure, generally designated by the reference numeral 12.
  • the movable contact structure 12 in addition, comprises an arcing horn means 14, which, together with the movable contact structure 12, is carried by a movable piston 16 secured to a piston rod 17, the latter being, mechanically driven by a suitable operating mechanism, more fully described hereinafter.
  • the movable piston member 1 6 re ciprocally operates within a stationary operating cylinder 19 having a radially outwardly extending flange ring,19a (FIG. 1 which is secured, as by bolts (not shown), to a metallic support ring 21, which is stationarily supported within a recess 22 provided on the inner face of the upstanding porcelaincasing 2, as shown in FIG. 1.. v
  • piston rod 17 extends through an opening 24 provided in the base portion 25 of the operating cylinder 19, and is pivotally connected, as at 27, adjacent its lower end, through a floatinglink 29, which, in turn, is pivotally connected, as at 30, to a rotating crank-arm 31 movable with a rotatable crankshaft 32.
  • crankshaft 32 extends through a seal 33, and has an external crank arm 34 provided at its outer extremity, which is mechanically connected, by linkage means 35, to a suitable operating mechanism,- generally designated-by the reference numeral 36. From the foregoing description, it will be apparent that functioning of the operating mechanism 36 will effect closing and opening rotative movement of the rotatable crankshaft 32, and hence vertical opening and closing movement of the piston rod 17 and movable contact structure 12 with respect to the stationary contact 10.
  • the movable piston member 16 carries therewith a movable accelerating coil 45, which has an electrical connection 46 tothe arcing horn 14.
  • the movable accelerating coil.45 has its other terminal connected, by a conductor 48 (FIG. 2), to a vertical movable conducting bar 50 extending lengthwise of the operating piston rod 17 and movable ther'e'with.
  • a contact finger 51 bears in sliding relationship with the longitudinal movable contact bar 50 to electrically connect the contact bar 50 with one terminal 52 (FIG. 3) of a movable accelerating'coil 54, which is embedded in a floating piston member 56 reciprocally movable within the operating cylinder 19, and latched in the position shown in FIG. 1 by a spring biased latching element 58.
  • the other terminal 60 (FIG. 3) of the movable accelerating coil 54 is electrically connected to a contact finger 61 (FIG. 3), which slides relevant to a longitudinal movable contact bar 62, more clearly shown in FIGS. 3 and 4 of the drawings.
  • the movable floating piston member 56 carrying theaccelerating coil 54, in addition, has a unidirectional valve 63 associated therewith to permit fluid to flow only upwardly through the aperture 64, and not downwardly therethrough, the purpose for which will be more fully understood from the following description.
  • the stationary accelerating coil 66 disposed in the base portion 25 of the operating cylinder 19, also has a pair of contact fingers 67, 68 connected to the terminals thereof, as shown more clearly in FIG. 4 of the drawings.
  • the contact finger 67 permits sliding engagement with the longitudinal movable contact bar 62
  • the stationary contact finger 68 makes sliding connection with a longitudinal movable contact bar 70, also supported on the insulating operation piston rod 17 and electrically connected to main contacts 11.
  • the base 25 has a pair of apertures 71 provided therethro'ugh to permit fluid to. flow from the lower base container 74 upwardly into the region 75 below the floating piston member 56.
  • a stationary contact finger 76 bears in sliding relationship with the longitudinal movable contact bar 70, and provides a connection to the base casting 74 of the circuit interrupter l, which has a line terminal connection 78.
  • a line terminal L may be connected, by a bolt 80, to the terminal 78 and hence, through the connection 77, to the longitudinal movable contact bar 70.
  • Agas-filled puffer breaker has features which the dualpressure breakers lack. Filled to a low pressure, such as 45 p.s.i.g., for example, the puffer or piston-operated breaker does not reqpire heaters to prevent liquefaction of the arcextinguishing' gas.
  • the pressure required for interruption is produced, when needed, by the motion of a piston within an operating cylinder, thus eliminating expensive gas-handling system with its attendant gauges, compressor, reservoirs, filters, etc.
  • the chief disadvantage of the puffer, or pistontype circuit interrupter is the large mechanical forces required to produce the needed gas flow. By incorporating accelerating coils, as shown, in the piston and cylinder assembly, it is possible to obtain additional energy from the fault current to compress the gas from the magnetic field produced by the short circuit current.
  • Independent Check valve 63 permits cool gas from behind the interrupter to mix with warm gas drawn in through theinterrupter contacts. It is anticipated that the interrupter I would be designed to handle half rating without the magnetic boost, thus greatly minimizing the energy reauire ments of the operating mechanism 36.
  • FIG. 6 illustrates diagrammatically a modified connection diagram for the three accelerating coils.
  • the arcing horn I4 is electrically connected to the main contact fingers 11.
  • the three accelerating coils are cut in by a separate switch 84, which is operated by the piston rod 17.
  • This may be a small high-speed puffer type of interrupter, but for purposes of illustration, is shown to be a simple normally closed switch 84 to divert the fault current into the accelerating coils 45, 54 and 66 by the action of rotating cam 86 and a driving link 88.
  • the cam 86 in rotating during the opening operation will open the switch 84.
  • the switch 84 has one contact 84a electrically connected by a connection 90 to a sliding finger contact 91 sliding on the conductor bar surface 7Q.
  • the other ;con tact 84b is connected by a connector 92 with the terminal 6913 coil 66. As shown in FIG. 6, the line connection L may be directly connected with this coil terminal 69,
  • the switch operation could be made sensitive to the exact instant of time at. which fault-current magnitude, so that positive control of the exact instant of time at which the coils will be used, can be obtained.
  • the sw' ch 84 will be closed immediately after the main contacfi, 12 reach the fully open position and the low portion o the cam is reached, thus eliminating any possibility f the three accelerating coils 45, 54 and 66 cutting in on the c osing stroke.
  • a fluid-blast circuit interrupter including contact means separable to establish an arc, fluid-driving means including a piston and an operating cylinder relatively movable with respect to each other for forcing fluid into the established arc to effect the extinction thereof, electromagnetic means for augmenting the relative motion between said piston and said operating cylinder comprising three accelerating coils one in the piston, one in the operating cylinder and a third coil in a floating piston movable within the operating cylinder, and means for transferring the series line current through said three coils in series to thereby bring about the existence of repulsive and attractive magnetic forces between the coils and thereby achieve such augmented piston action.
  • the transferring means comprises a movable arcing horn means insulated from the contact means and movable with a movable piston, and said movable piston reciprocally operating within a relatively stationary operating cylinder.
  • a fluid-blast circuit interrupter including casing means, a relatively stationary operating cylinder disposed interiorly within said casing means and having an apertured end head, a movable piston reciprocally operable within said operating cylinder, an operating rod for actuating said movable piston and extending out of said apertured end head, a separable contact means including a movable contact carried by the movable piston, arcing horn means carried by said movable piston and insulated from said movable contact, a first accelerating coil carried by said movable piston and electrically connected to said movable arcing horn means, a floating piston disposed interiorly within said operating cylinder and carrying a second accelerating coil, a third accelerating coil stationarily supported in said apertured end head, conducting means for electrically connecting the three accelerating coils in series, nozzle means carried by said movable piston for directing fluid under pressure compressed within said operating cylinder into the are established between the separable contact means, and the transfer of the series line current to said arcing horn means and
  • the conducting means Comprises conducting bars extending lengthwise along the operating rod.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Circuit Breakers (AREA)
  • Servomotors (AREA)
  • Actuator (AREA)
US576575A 1966-09-01 1966-09-01 Fluid-blast circuit interrupters with piston-driving means and cooperable floating piston with accelerating coil Expired - Lifetime US3551623A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US57657566A 1966-09-01 1966-09-01

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US3551623A true US3551623A (en) 1970-12-29

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US576575A Expired - Lifetime US3551623A (en) 1966-09-01 1966-09-01 Fluid-blast circuit interrupters with piston-driving means and cooperable floating piston with accelerating coil

Country Status (9)

Country Link
US (1) US3551623A (fr)
JP (1) JPS438051B1 (fr)
AT (1) AT273281B (fr)
BE (1) BE703408A (fr)
CH (1) CH465033A (fr)
DE (1) DE1690503A1 (fr)
FR (1) FR1535396A (fr)
GB (2) GB1140584A (fr)
SE (1) SE310723B (fr)

Cited By (5)

* 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
US3987262A (en) * 1975-05-12 1976-10-19 Westinghouse Electric Corporation Puffer-type gas-blast circuit-interrupter having variable-area stationary composite piston structure
US4086645A (en) * 1977-02-18 1978-04-25 Electric Power Research Institute, Inc. Repulsion coil actuator for high speed high power circuits
US4511775A (en) * 1981-10-17 1985-04-16 Bbc Brown, Boveri & Company, Limited Circuit breaker
US4553004A (en) * 1983-03-11 1985-11-12 Alsthom-Atlantique Puffer-type gas-blast circuit-breaker

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3015946A1 (de) * 1980-04-25 1981-10-29 Brown, Boveri & Cie Ag, 6800 Mannheim Blaskolbenschalter
DE3127678A1 (de) * 1981-07-14 1983-02-10 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Hochspannungs-leistungsschalter
DE3231169A1 (de) * 1982-08-21 1984-02-23 BBC Aktiengesellschaft Brown, Boveri & Cie., 5401 Baden, Aargau Blaskolbenschalter

Cited By (5)

* 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
US3987262A (en) * 1975-05-12 1976-10-19 Westinghouse Electric Corporation Puffer-type gas-blast circuit-interrupter having variable-area stationary composite piston structure
US4086645A (en) * 1977-02-18 1978-04-25 Electric Power Research Institute, Inc. Repulsion coil actuator for high speed high power circuits
US4511775A (en) * 1981-10-17 1985-04-16 Bbc Brown, Boveri & Company, Limited Circuit breaker
US4553004A (en) * 1983-03-11 1985-11-12 Alsthom-Atlantique Puffer-type gas-blast circuit-breaker

Also Published As

Publication number Publication date
DE1690503A1 (de) 1971-06-03
GB1149584A (en) 1969-04-23
BE703408A (fr) 1968-02-01
SE310723B (fr) 1969-05-12
CH465033A (de) 1968-11-15
JPS438051B1 (fr) 1968-03-27
GB1140584A (en) 1969-01-22
AT273281B (de) 1969-08-11
FR1535396A (fr) 1968-08-02

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