US3597556A - Vacuum-type circuit breaker with force-supplementing means for increasing current-carrying abilities - Google Patents

Vacuum-type circuit breaker with force-supplementing means for increasing current-carrying abilities Download PDF

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Publication number
US3597556A
US3597556A US3457A US3597556DA US3597556A US 3597556 A US3597556 A US 3597556A US 3457 A US3457 A US 3457A US 3597556D A US3597556D A US 3597556DA US 3597556 A US3597556 A US 3597556A
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United States
Prior art keywords
contact
force
closing
circuit breaker
operating mechanism
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Expired - Lifetime
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US3457A
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English (en)
Inventor
William T Sharp
Claude H Archer
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General Electric Co
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General Electric Co
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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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
    • 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
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/666—Operating arrangements
    • H01H2033/6667—Details concerning lever type driving rod arrangements
    • 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
    • H01H33/14—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc

Definitions

  • a vacuum-type circuit breaker in which a wipe mechanism is interposed between the contact rod of the circuit breaker and the operating mechanism that supplies force for closing and opening the circuit breaker.
  • the wipe mechanism comprises a wipe spring through which contact-closing force is transmitted from the operating mechanism to the contact rod during closing.
  • Latching means comprising a cam mechanism operable when the contact rod is near closed position is provided for exerting a supplemental closing force on the contact rod that is transmitted to the contact rod via a force-transmitting path that effectively bypasses the wipe spring.
  • the latching means is disabled by the operating mechanism before the wipe mechanism allows an efiective opening force to be transmitted from the operating mechanism to the contact rod.
  • This invention relates to an electric circuit breaker of the vacuum type, and, more particularly. relates to an electric circuit breaker of this type in which means is provided for applying a supplemental force to the contacts ofthe circuit breaker for holding the contacts closed against high currents and for assisting them in closing against high currents.
  • the conductive path through the contacts of the circuit breaker constricts at the point of contact-engagement and thus contains portions ofa generally loop-shaped configuration adjacent the point of contact-engagement.
  • Current flowing through each of these loop-shaped path portions produces magnetic forces tending to enlarge the loop, and these forces are in a direction tending to open the contacts of the breaker.
  • These magnetic opening forces vary in magnitude in accordance with the square of the current flowing through the breaker, and hence during the highest current conditions, i.e., rated momentary currents and other short-circuit currents, extremely high magnetic contact-opening forces can be developed.
  • US. Pat. No. 3,225,160, Barkan assigned to the assignee of the present invention. Note particularly FIG. 3 thereof.
  • An object of our invention is to provide a circuit breaker which can be closed against maximum rated closing currents by a closing mechanism which, by itself, is insufficiently powerful to close the circuit breaker against such maximum rated currents.
  • Another object of our invention is to provide a circuit breaker which is able to hold its contacts closed against the highest rated current, i.e., rated momentary current, despite reliance upon a wipe spring that, by itself, is not capable of providing a sufficiently high hold-closed force to prevent contact separation under the magnetic effect of such rated momentary current.
  • Another object is to provide latching means capable of exerting a supplemental hold-closed force on the contacts that is transmitted to the contacts via a force-transmitting path that effectively bypasses the wipe spring.
  • Still another object is to provide latching means of the above type capable of making available a supplemental holdclosed force for two separate interrupters and comprising a latching member common to the two interrupters that remains effective despite unequal contact erosion in the two interrupters.
  • a vacuum-type circuit breaker that includes a vacuum interrupter comprising a contact rod for supporting its movable contact.
  • a vacuum interrupter comprising a contact rod for supporting its movable contact.
  • an operating mechanism is provided which is coupled to the contact rod through a wipe mechanism.
  • the wipe mechanism comprises a wipe spring through which contactclosing force is transmitted during closing.
  • Latching means comprising a cam mechanism operable when the contact rod is in and near closed position is provided for exerting a supplemental closing force on the contact rod that is transmitted to the contact rod via a force-transmitting path that effectively bypasses the wipe spring.
  • Means is provided for disabling the latching means early in an opening operation before an opening force is applied to the contact rod through the operating mechanism and wipe mechanism.
  • FIG. 1 is a sectional view, partly schematic, showing a vacuum circuit breaker embodying one form of our invention. The circuit breaker is shown in its fully closed position.
  • FIG. 2 is a view ofa portion of the circuit breaker of FIG. 1 at an intermediate point during an opening operation.
  • FIG. 3 is a view ofa portion of the circuit breaker of FIG. I in its fully open position.
  • FIG. 1 there is shown a pair of vacuumtype circuit interrupters I0 that are electrically connected together in series-circuit relationship by a conductor schematically indicated at 8.
  • Each interrupter 10 comprises a pair of separable contacts 11 and 12.
  • Contact II is a stationary contact
  • contact 12 is a movable contact that is vertically movable into and out of engagement with the stationary contact.
  • FIG. I each of the circuit interrupters is shown in its fully closed position where contact 12 engages contact 11. Opening of the upper interrupter is effected by driving contact 12 downwardly from its position of FIG. 1 into its fully open position of FIG. 3. Opening of the lower interrupter is effected by driving contact I2 upwardly from its position of FIG. I into its fully open position of FIG. 3. Closing of the interrupters is effected by driving movable contacts 12 back into engagement with their respective stationary contacts 11.
  • Each of the interrupters is a vacuum-type circuit interrupter that comprises a highly evacuated envelope I3 comprising a cylindrical insulating casing 14 and end caps 15 and [50 joined thereto by suitable vacuumtight seals.
  • Stationary contact II is mounted on a stationary conductive rod 9 that is integrally joined to the outer end cap 150.
  • Movable contact I2 is mounted on a movable conductive contact rod I7 that projects freely through the inner end cap 15.
  • a flexible metallic bellows 171 permits vertical movement of rod I7 without impairing the vacuum inside envelope 13.
  • each contact rod is provided with a guide link 22 and a suitable guide bearing 24 surrounding the contact rod.
  • the guide link 22 is pivoted at one end on a stationary pivot 25 mounted on frame 20 and at its other end is pivotally connected by pin 26 to the movable contact rod.
  • a suitable operating mechanism For driving the movable contacts 12 between their fully open position of FIG. 3 and their fully closed position of FIG. I, a suitable operating mechanism is provided. Since this operating mechanism can be of any suitable conventional type, its major components have been represented by a block 30. An example of a suitable operating mechanism is shown and claimed in US. Pat. No. 3,] l3,l9l, Frank, assigned to the assignee of the present invention. In addition to the parts contained in block 30, the operating mechanism further com prises an operating rod 32 that is guided for straight-line movement in a horizontal direction by a bearing 34 on the stationary frame 20. Operating rod 32 has a slot 33 in its lefthand end that freely receives a stationary pin 64. Slot 33 per mits the operating rod to be moved longitudinally through a complete opening or closing stroke without interference from pin 64.
  • each link 36 is pivotally connected by a pivot pin 35 at one end to operating rod 32 and at its opposite end is pivotally connected by pin 37 to a guide line 38, which, in turn, is pivotally mounted on stationary pivot 25.
  • This wipe mechanism 40 For transmitting motion between each connecting link 36 and its associated contact rod 17, we provide a wipe mechanism 40 corresponding to the wipe mechanism shown and claimed in US. Pat. No. 3,l63,735, Miller, assigned to the assignee of the present invention.
  • This wipe mechanism 40 comprises an intermediate link M of rod form that is pivotally connected at one end to contact rod 17 and is pivotally connected with lost motion at its opposite end to the connecting link 36.
  • the connection to the contact rod is through pivot pin 26, and the connection to link 36 is through the previously described pivot pin 37, which is carried by links 36 and 38 and is journaled therein for rotation about its own axis.
  • Pin 37 has a transversely extending hole therethrough which slidably receives the intermediate rod 41 to permit motion of pivot 37 along the length of rod 41.
  • a compression spring 43 Disposed between pivot 37 and the other end of intermediate rod 4! is a compression spring 43 that encircles the intermediate rod 41. This compression spring 43 tends to urge the pivot 37 against a stop 45 fixed to rod 41. Since compression spring 43 is carried by rod 41, it will be apparent that the spring moves bodily with rod 4! during all interrupter operations.
  • Opening of the circuit breaker is effected by driving operating rod 32 to the right from its closed position of FIG. 1 back to its fully open position of FIG. 3.
  • no opening force is applied to the movable contact rod 17 since each of the pivot pins 37 is then merely sliding along its intermediate rod 41 without driving the intermediate rod. This lost motion continues until pivot pin 37 strikes its associated stop 45.
  • an abrupt opening force is applied to the associated movable contact rod 17 to move it rapidly in an opening direction to separate contact 12 from contact ll, thereby interrupting the circuit.
  • each of the wipe springs 43 When the circuit breaker is in its fully closed position of FIG. 1, each of the wipe springs 43 is exerting a hold-closed force on the contacts 12, ll of the associated interrupter. In a circuit breaker that has a high momentary current rating, this hold-closed force must be very high if it is to be able to hold the contacts closed against the high magnetic opening forces developed during the high momentary currents. It is possible to provide a wipe spring 43 heavy enough to provide the required high hold-closed force, but this is disadvantageous because an undue amount of force is needed to compress such a spring during the above-described travel. This necessitates an unduly large and powerful operating mechanismv To enable a lighter wipe spring to be relied upon, we provide force-supplementing latching means 60.
  • This latching means 60 comprises a latch member 62 pivotally mounted on a stationary pivot pin 64 and a compression spring 66 urging the latch member in a clockwise direction about pivot 64.
  • Latch member 62 has two cam surfaces 68 and 70 at its opposite ends. When the circuit breaker is in its closed position of FIG. 1, these cam surfaces 68 and 70 engage rollers 74 carried by extensions of the contact rods 17 and transmit a holdclosed force to the contact rods, as will soon be explained.
  • the rollers 74 can be considered cam followers.
  • Cam surfaces 68 and 70 are able to transmit hold-closed forces to the contact I7 because they are offcenter surfaces that are divergent with respect to the periphery ofa reference circle 75 that has as its center the pivot axis of the latch member 62.
  • the contact point between the followers 74 and the cam 68 or 70 becomes progressively further away from the pivot axis. The result is a wedging action that forces the two contact rods 17 toward their corresponding stationary contacts 11.
  • latch member 62 When the circuit breaker is in its fully open position of FIG. 3, latch member 62 is in a disabled condition. Spring 66 is urging the latch member clockwise, but inactive surfaces 76 and 77 on the latch member are engaging the followers 74 and no appreciable closing force is being exerted on the contact rods through the latch member. When the contact rods 17 are driven away from each other toward their closed positions, the followers 74 pass beyond the outer ends 80 and 82 of the inactive surfaces 76, 77. This enables spring 66 to pivot latch member 62 clockwise sufficiently to force the active cam surfaces 68 and 70 behind the followers 74. Further clockwise motion of latch member 62 produces the above-described wedging action which aids in driving the contact rods toward their fully closed position.
  • the amount of force supplied through cam surfaces 68 and 70 to the contact rods 17 depends upon the size of latch-biasing spring 66 and the steepness of the cam surfaces 68 and 70 to the contact rods 17 depends upon the size of latchbiasing spring 66 and the steepness of the cam surfaces 68 and 70.
  • the points 80 and 82 on the latch surfaces are so located that both the active cam surfaces 68 and 70 can begin to engage the followers 74 at a point well ahead of contact-engagement during closing.
  • latch member 62 for supplying hold-closed force to both interrupters.
  • the latch member may be thought of as a so id wedge between the two movable contact rods 17. It will be apparent that a portion of the magnetic opening forces developed at either interrupter are transmitted through latch member 62 to the contact rod of the other interrupter are transmitted through latch member 62 to the contact rod of the other interrupter as a force acting in a direction to hold closed the contacts of the other interrupter.
  • the latch member 62 To permit the latch member 62 to adjust itself to compensate for unequal contact wear in the two interrupters, we provide the latch member with a slot 83 that slidably receives the stationary pivot 64 and enables the latch member to slide on the stationary pivot 64 along a reference line 84 extending between the two cam surfaces. By shifting slightly along reference line 84, the latch member can find a position where both of its cam surface 68 and 70 will always engage the followers 74 when the two interrupters are closed.
  • This disabling means comprises a latch-releasing member 85 carried by the left-hand end of the operating rod 32.
  • the tip of the latch-releasing member 85 engages latching member 62 and causes the latching member to pivot counterclockwise about stationary pivot 64.
  • FIG. 2 shows the parts after such pivoting of latch member 62 has progressed to a point where the latch member would no longer be able to exert a substantial hold-closed force on the contact rods, even if engaged by follower rollers 74.
  • cam-starting points 80 and 82 have swung beyond the longitudinal axis 84 of the two contact rods.
  • latch-releasing member 85 is pivotally mounted on the operating rod 32 by a pivot pin 87 and is biased by a spring 88 counterclockwise about pivot 87 into contact with a stop 89 on the operating rod.
  • the latch releasing member 85 is an over center condition capable of transmitting thrust to latching member 62 when its tip 90 engages the latching member during the above-described latch-releasing operation.
  • the latch-releasing member 85 is rotated slightly in a clockwise direction about 87, it is no longer capable of transmitting thrust to latch member 62.
  • Such clockwise motion is effected by stationary pin 94 that engages an arm 92 of the latch-releasing member after the operating rod 32 has been moved through a portion of its opening stroke, as will soon be described.
  • a primary reason for disabling the latch-releasing member 85 is to prevent its interference with return of latch member 62 to its latching position at a proper point during a subsequent closing operation.
  • the latch spring 66 can bias the inactive surfaces 76 and 77 of the latch against the followers during the initial stages of the subsequent closing operation. Only these surfaces 76 and 77, and not the releasing member 85, are blocking the latch from returning to its latching position.
  • the followers pass beyond the points 80 and 82 and the latch spring 66 is then free to drive latch member 62 into its latching position without interference from the releasing member 85.
  • a vacuum-type circuit breaker comprising:
  • a vacuum interrupter comprising:
  • a wipe mechanism interposed between said contact rod and said operating mechanism and comprising a wipe spring through which said contact-closing force is transmitted from said operating mechanism to said contact rod during closing, said wipe spring yielding to permit overtravel of said operating mechanism after said contacts have engaged at the end of a closing operation
  • latching means comprising a cam mechanism operable when said second contact is in and near its closed position for exerting a supplemental closing force on said contact rod that is transmitted to said contact rod via a forcetransmitting path that effectively bypasses said wipe spring
  • said wipe mechanism containing lost motion for providing a delay in the application of said opening force to said contact rod following initiation of an opening operation.
  • said latching means and cam mechanism comprises a movable latch member and spring means for moving said latch member into a terminal position as said second contact moves into its fully engaged position
  • said latch member has a cam surface
  • said contact rod is coupled to a follower that is engaged by said cam surface when said second contact is in and near its fully engaged position
  • said cam surface is shaped to exert wedging action on said follower as said latch member moves toward its terminal position, said wedging action developing a force on said follower acting in a contact-closing direction.
  • a vacuum-type circuit breaker comprising:
  • Two wipe mechanism respectively interposed between said contact rods and said common operating mechanism and each comprising a wipe spring through which contact-closing force is transmitted from said operating mechanism to the contact rod of the associated interrupter during closing, each of said wipe springs yielding to permit overtravel of said operating mechanism after the contacts of the associated interrupter have engaged at the end of a closing operation,
  • latching means operable when both of said second contacts are near their closed positions for exerting supplemental closing force on both of said contact rods that is transmitted to said contact rods via force-transmitting paths that effectively bypass each of said wipe springs,
  • said latching means comprising a latch member common to the two interrupters through which a portion of the magnetic force tending to open one set of contacts is imparted to the other set of contacts as a force in a direction to hold said other set closed.
  • a vacuum-type circuit breaker as defined in claim 4 in which:
  • said common latch member is pivotally mounted and has cam surfaces at its opposite ends through which said supplemental closing force is transmitted to said contact rods,
  • said common latch member is so mounted that it can shift bodily in a direction radially of its original pivot axis to maintain both of said cam surfaces in engagement with their respective followers when the contacts of both interrupters are engaged despite unequal contact erosion, and
  • said latching means further comprises spring means biasing said latch member into a position where both of said cam surfaces engage said followers when the contacts for both interrupters are engaged.
  • a vacuum-type circuit breaker as defined in claim 8 in which:
  • said means for disabling said latching means comprises releasing means responsive to an opening operation of said operating mechanism
  • said means for disabling said latching means comprises releasing means responsive to an opening operation of said operating mechanism.
  • said releasing means is maintained in a condition to trans mit thrust to said latching means when said contacts are engaged
  • the disabling means for said releasing means renders said releasing means ineffective to transmit thrust to said latching means at said predetermined point in said opening operation.

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  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US3457A 1970-01-16 1970-01-16 Vacuum-type circuit breaker with force-supplementing means for increasing current-carrying abilities Expired - Lifetime US3597556A (en)

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US345770A 1970-01-16 1970-01-16

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US (1) US3597556A (enrdf_load_stackoverflow)
JP (1) JPS5121144B1 (enrdf_load_stackoverflow)
FR (1) FR2075511A5 (enrdf_load_stackoverflow)

Cited By (29)

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US3728508A (en) * 1971-10-26 1973-04-17 Ite Imperial Corp Operating mechanism for vacuum circuit breaker including contact pressure springs
JPS49150357U (enrdf_load_stackoverflow) * 1973-04-26 1974-12-26
US3956721A (en) * 1975-04-16 1976-05-11 Rte Corporation Fault interrupter
US3958156A (en) * 1974-10-21 1976-05-18 Allis-Chalmers Corporation Vacuum interrupter metal-clad switchgear vertically elevatable within compartment
DE3147016A1 (de) * 1981-11-27 1983-06-01 Calor-Emag Elektrizitäts-Aktiengesellschaft, 4030 Ratingen Hochspannungsschalter
US4550234A (en) * 1983-01-12 1985-10-29 Siemens Aktiengesellschaft Vacuum circuit breaker with two switching tubes connected in series for each pole
DE3447314A1 (de) * 1984-12-24 1986-06-26 Calor-Emag Elektrizitäts-Aktiengesellschaft, 4030 Ratingen Einrichtung fuer eine vakuum-schaltroehre
US4736114A (en) * 1985-02-23 1988-04-05 Sachsenwerk Licht- Und Kraft-Aktiengesellshaft Electrical switching system and method to switch this system
DE3906786A1 (de) * 1989-03-03 1990-09-13 Sachsenwerk Ag Antriebsmechanismus
US4973803A (en) * 1988-05-16 1990-11-27 Kabushiki Kaisha Toshiba Vacuum circuit breaker
US5286936A (en) * 1990-10-25 1994-02-15 Fuji Electric Co., Ltd. Circuit breaker driving device
US6205018B1 (en) 1995-01-26 2001-03-20 Abb Ab Air insulated switchgear with operating device for effect circuit breaker
CN102623237A (zh) * 2012-04-19 2012-08-01 长沙智通电力设备有限公司 真空断路器的永磁操动机构
US20130223875A1 (en) * 2012-02-24 2013-08-29 Yan BIN Interlock switch mechanism and image formation device utilizing the same
US20130270083A1 (en) * 2012-04-13 2013-10-17 Abb Technology Ag Retaining Structure For Maintaining Factory Settings Of Gang-Style Linkage For High Voltage Dead Tank Breaker While Mechanism Is Removed
US20140360853A1 (en) * 2013-06-07 2014-12-11 Hitachi, Ltd. Switchgear and opening and closing method thereof
US20150108090A1 (en) * 2012-05-31 2015-04-23 Alstom Technology Ltd Circuit breaker apparatus
US10957505B2 (en) * 2019-06-19 2021-03-23 Eaton Intelligent Power Limited Disconnect switch assemblies with a shared actuator that concurrently applies motive forces in opposing directions and related circuit breakers and methods
US11069495B2 (en) * 2019-01-25 2021-07-20 Eaton Intelligent Power Limited Vacuum switching apparatus and drive mechanism therefor
US11152178B2 (en) 2019-03-01 2021-10-19 Eaton Intelligent Power Limited Disconnect switches with combined actuators and related circuit breakers and methods
US20220068574A1 (en) * 2019-05-24 2022-03-03 Stacom Engineering Company Methods and systems for dc current interrupter based on thermionic arc extinction via anode ion depletion
US20220076910A1 (en) * 2020-09-04 2022-03-10 Eaton Intelligent Power Limited Switching apparatus with electrically isolated user interface
US20220189717A1 (en) * 2019-03-29 2022-06-16 Siemens Energy Global GmbH & Co. KG Current interrupter system
US20220216021A1 (en) * 2018-09-12 2022-07-07 Siemens Energy Global GmbH & Co. KG Circuit breaker
US20220270839A1 (en) * 2021-02-19 2022-08-25 Eaton Intelligent Power Limited Closing spring assemblies for electrical switching devices
US11462374B2 (en) * 2020-05-05 2022-10-04 Siemens Aktiengesellschaft Kinematic linkage arrangement for a switching device
US11657987B2 (en) * 2020-04-14 2023-05-23 Siemens Aktiengesellschaft Dielectric shield for a switching device
US20230420202A1 (en) * 2022-06-23 2023-12-28 Abb Schweiz Ag Medium Voltage or High Voltage Circuit Breaker
US20240006137A1 (en) * 2022-07-01 2024-01-04 Abb Schweiz Ag Medium Voltage or High Voltage Circuit Breaker

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JPS5341777A (en) * 1976-09-29 1978-04-15 Hitachi Ltd Breaker linkage
JPS53147444U (enrdf_load_stackoverflow) * 1977-04-25 1978-11-20
JPS54140332U (enrdf_load_stackoverflow) * 1978-03-24 1979-09-29
JPS56148835U (enrdf_load_stackoverflow) * 1980-04-09 1981-11-09
JPS5740816U (enrdf_load_stackoverflow) * 1980-08-19 1982-03-05
DE19912022B4 (de) 1999-03-17 2009-02-12 Abb Ag Hochspannungsschaltgerät mit Serienschaltung von mindestens zwei Vakuumschaltkammern und Verfahren zum Betrieb des Hochspannungsschallgerätes
WO2025013173A1 (ja) * 2023-07-10 2025-01-16 三菱電機株式会社 真空遮断器

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US3209101A (en) * 1963-01-08 1965-09-28 Allis Chalmers Mfg Co Motor and spring operated vacuum switch
US3211868A (en) * 1963-03-14 1965-10-12 Gen Electric Electric circuit breaker having an auxiliary switch with an oscillation-damping latch
US3300609A (en) * 1963-05-15 1967-01-24 Ass Elect Ind Switchgear for high voltage power circuits with removable vacuum switch units

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GB341364A (en) * 1929-04-27 1931-01-15 Gen Electric Improvements in and relating to electric vacuum switches
US2794881A (en) * 1954-07-22 1957-06-04 Gen Electric Circuit breaker operating mechanism
US2905787A (en) * 1957-12-26 1959-09-22 Gen Electric Operating mechanism for an electric switch
US3163735A (en) * 1962-06-29 1964-12-29 Gen Electric Electric circuit breaker with sealed interrupting unit
US3209101A (en) * 1963-01-08 1965-09-28 Allis Chalmers Mfg Co Motor and spring operated vacuum switch
US3211868A (en) * 1963-03-14 1965-10-12 Gen Electric Electric circuit breaker having an auxiliary switch with an oscillation-damping latch
US3300609A (en) * 1963-05-15 1967-01-24 Ass Elect Ind Switchgear for high voltage power circuits with removable vacuum switch units

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3728508A (en) * 1971-10-26 1973-04-17 Ite Imperial Corp Operating mechanism for vacuum circuit breaker including contact pressure springs
JPS49150357U (enrdf_load_stackoverflow) * 1973-04-26 1974-12-26
US3958156A (en) * 1974-10-21 1976-05-18 Allis-Chalmers Corporation Vacuum interrupter metal-clad switchgear vertically elevatable within compartment
US3956721A (en) * 1975-04-16 1976-05-11 Rte Corporation Fault interrupter
DE3147016A1 (de) * 1981-11-27 1983-06-01 Calor-Emag Elektrizitäts-Aktiengesellschaft, 4030 Ratingen Hochspannungsschalter
US4550234A (en) * 1983-01-12 1985-10-29 Siemens Aktiengesellschaft Vacuum circuit breaker with two switching tubes connected in series for each pole
DE3447314A1 (de) * 1984-12-24 1986-06-26 Calor-Emag Elektrizitäts-Aktiengesellschaft, 4030 Ratingen Einrichtung fuer eine vakuum-schaltroehre
US4736114A (en) * 1985-02-23 1988-04-05 Sachsenwerk Licht- Und Kraft-Aktiengesellshaft Electrical switching system and method to switch this system
US4973803A (en) * 1988-05-16 1990-11-27 Kabushiki Kaisha Toshiba Vacuum circuit breaker
DE3906786A1 (de) * 1989-03-03 1990-09-13 Sachsenwerk Ag Antriebsmechanismus
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Also Published As

Publication number Publication date
JPS5121144B1 (enrdf_load_stackoverflow) 1976-06-30
FR2075511A5 (enrdf_load_stackoverflow) 1971-10-08
JPS46226A (enrdf_load_stackoverflow) 1971-08-20

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