US3655935A - Gas pressure damper means for a circuit breaker mechanism - Google Patents

Gas pressure damper means for a circuit breaker mechanism Download PDF

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Publication number
US3655935A
US3655935A US18084A US3655935DA US3655935A US 3655935 A US3655935 A US 3655935A US 18084 A US18084 A US 18084A US 3655935D A US3655935D A US 3655935DA US 3655935 A US3655935 A US 3655935A
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US
United States
Prior art keywords
movable member
damping
space
gas
piston
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Expired - Lifetime
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US18084A
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English (en)
Inventor
Jan P Houben
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COQ NV
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COQ NV
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Publication date
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Publication of US3655935A publication Critical patent/US3655935A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H01H3/605—Mechanical arrangements for preventing or damping vibration or shock making use of a fluid damper
    • 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
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic

Definitions

  • Oppositely projecting reduced area portions of the piston project into recesses at either end of the stroke to trap gas ahead of these portions to retard and substantially to stop the piston at each end of its stroke as it reaches stops delineating such ends of the strokes.
  • a check valve is associated with each recess to allow the stop motion and prevent rebound and the relief pressure of each valve is varied in accord with pressure fluctuations in the driving gas supply so that the retarding and stop motion effects are adjusted to the piston speed as affected by the driving gas pressure.
  • the invention relates to an apparatus, such as an electric switch for high voltage, comprising a movable member, e.g. the movable switching contact with accessories of such a switch, said member being adapted to move between two end positions defined by stops, and a gas damper adapted to damp the movement of said movable member on the approach of a stop, said gas damper being provided with a cylinder and a piston, said cylinder and piston cooperating at least, when said movable member and the relevant stop approach each other, and confining a closed cylinder space having a volume, which decreases during the further movement of said member towards said stop, and containing a gas mass, which counteracts said further movement.
  • the gas damper has the task to reduce the great speed of the movable member to a harmless value before said member hits the stop.
  • the kinetic energy of the movable member must be converted into other forms of energy which can be easily dissipated.
  • the invention has the object to provide an apparatus comprising a gas damper of the kind referred to, in which all requirements imposed on the gas damper can be satisfied in a simple manner.
  • the invention consists in that the cylinder space of the gas damper is connected to the atmosphere or a low-pressure space by a passage provided with a loaded check valve which closes towards said cylinder space. If therein the pressure in the cylinder space of the gas damper exceeds a given value, after the gas damper has become effective, the check valve is pushed open and a portion of the compressed gas is discharged from said space.
  • the check valve may be loaded by a spring which, if required, is adjustable. In many occasions it is also possible to use to that end a gas cushion. If the apparatus is provided with a pneumatically driven movable member and if the driving pressure and the pressure of the gas contained in the damping cylinder, before the gas damper becomes effective, are, in normal operation, liable to vary within a given range, as happens in gas blast circuit breakers, in which the extinguishing gas is also used for driving and damping purposes, it is recommended to connect the space, in which the gas cushion loading the check valve is contained, to the high-pressure side of the pneumatic driving system.
  • the load of the check valve that means the effect of the gas damper, is then automatically adapted to the driving force, exerted on the movable member, e.g. the movable switching contact of the apparatus and also the kinetic energy thereof which has to be dissipated.
  • the invention also relates to the individual gas damper comprising a cylinder and a piston, which during operation confine a gas filled closed cylinder space, to which a passage provided with a loaded check valve closing towards said cylinder space and used to connect said space with the atmosphere or a lowpressure space is connected.
  • a gas damper is suitable for use in existing apparatusses.
  • FIG. 1 is an axial sectional view of a pneumatic driving mechanism for the movable switching contact of an electric switch provided with gas dampers according to the invention
  • FIG. 2 is an axial sectional view of a first variant of the gas damper shown in FIG. 1,
  • FIG. 3 is an axial sectional view of a second variant of said gas damper
  • FIG. 4 is an axial sectional view of a third variant of said gas damper.
  • a cylinder is designated by l and a piston by 2.
  • Said cylinder and said piston constitute together a pneumatic driving mechanism for a switching contact (not shown) of an electric switch which is coupled with the piston rod 3.
  • the cylinder cover 4, 5 are provided with damping cylinder spaces 8, 9 which are open towards the spaces 6, 7 of the cylinder 1 and into which damping pistons 10, 11 formed on the piston 2 are forced, when the piston 2 approaches the stop 12 or the stop 13 for limitting its stroke.
  • the damping cylinder spaces 8, 9 are each connected by a passage 14, 15 provided with a check valve l8, 19 closing towards said spaces and loaded by a spring l6, 17 to a space 20, 21 which communicates through ports 22, 23 with the atmosphere.
  • main cylinder spaces 6, 7 and the damping cylinder spaces 8, 9 are connected by passages 24, 25 and 26, 27 to multiple-way valves 28, 29 which are adapted to connect the main cylinder spaces 6, 7 either with the atmosphere or with a store vessel 30 containing gas under high pressure.
  • Said multiple-way valves are also adapted either to close the damping cyl nder spaces or to connect same with said store vessel 30.
  • the switch In the position shown in the drawing the switch is in its closed position, the main cylinder space 7 and the damping cylinder space 9 are connected with the high-pressure vessel 30 through the passages 25 and 27 and the valve 29 and the main cylinder space 6 communicates with the atmosphere through the passage 24 and the valve 28, whereas the damping cylinder space 8 is closed.
  • the coupled valves 28, 29 are rotated through an angle of 60,so that the main cylinder space 6 and the damping cylinder space 8 are connected with the vessel 30 and the main cylinder space 7 and the damping cylinder space 9 are brought into communication with the atmosphere, whereas the passage 27 connected to the damping cylinder space 9 is closed.
  • the pistons 2, 10, 11 and the switching contact coupled therewith by the piston rod 3 are then moved upwards with great force and accelerated, till the damping piston l l is forced into the cylinder space 9 and compresses the gas contained therein. Due to this compression such a braking force is exerted on the moving members 2, 3, l0, 11 that their speed is practically reduced to zero.
  • the pressure of the gas contained in the space 9 will have to rise to a value which generally will be considerably higher than that exerting on the damping piston 11 a force which is equal to the force exerted on the piston 2 by the pressure of the gas contained in the vessel 30.
  • the check valve 19 is pushed open, so that gas is discharged from the space 9 to the outside and the pressure in said space is suddenly considerably reduced. If care is taken that, before the check valve 19 has become closed again, the pressure in the space 9 is reduced to a valve, at which the driving force is only a little bit greater than the remaining braking force, the piston 2 will hit the stop 13 with low speed.
  • the screwed plug 32 is replaced by a piston 33 which is mounted for movement in a cylinder 34, the active space 35 of which contains gas under predetermined pressure.
  • the gas pressure can be adjusted to the required value by means of the conduit 36 and the valve 37.
  • the conduit 36 may also be connected to the vessel 30.
  • the valve 37 may be omitted and the gas pressure in the cylinder space 35 will adapt itself automatically to the driving force, that means to the kinetic energy of the movable member 2, 3, 10, ll of the apparatus.
  • the spring 17 may be replaced by a rigid element.
  • FIG. 3 the piston 33 of the embodiment shown in FIG. 2 is replaced by a diaphragm 38 which is connected to the check valve 40 by a rod 39.
  • FIG. 4 there is provided a bellows 41 instead of said diaphragm 38.
  • a circuit breaker apparatus having a movable member operable between opposite end positions for actuating a movable switching contact between closed and open conditions, means for driving said movable member including a supply of pressurized gas and a member driven thereby so that the speed of said movable member is in accord with the pressure of id supply, and at least one stop for limiting one of the end positions of said movable member, the improvement which comprises:
  • means associated with said movable member for exerting a retarding force on said movable member by compressing a mass of gas as said movable member approaches said one end position and including a damping space within which said mass of gas is compressed;
  • check valve means communicating with said damping space for permitting controlled escape of gas from said damping space whereby to control the retarding force exerted on said movable member as said stop is approached; and means connected to said check valve means for varying said controlled escape of gas in accord with the gas pressure of said supply, whereby to modify said retarding force in accord with the speed of said movable member.
  • said means associated with said movable member comprises a fixed cylinder having a portion defining said damping space and a piston operated by said movable member and movable within said damping space when said movable member approaches said one end position.
  • valve means for connecting said damping space with said supply to urge said movable member toward said other end position.
  • circuit breaker apparatus having a movable member operable between opposite end positions for actuating a movable switching contact between closed and open conditions, the improvement which comprises:
  • a cylinder having opposite end wall portions, at least one of which is provided with a dampin cylinder space;
  • a piston connected to said mova le member, said piston having an enlarged piston portion slidable in said cylinder and a reduced area piston portion aligned with but normally spaced from said damping cylinder space when said movable member is in one position thereof;
  • check valve means for venting said damping cylinder space at a pressure substantially higher than the pressure of said supply so as to allow said trapped mass of gas acting against said reduced area piston portion to reduce the velocity of said movable member substantially to zero as same reaches said other position thereof;

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Fluid-Damping Devices (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Actuator (AREA)
US18084A 1969-03-14 1970-03-10 Gas pressure damper means for a circuit breaker mechanism Expired - Lifetime US3655935A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6903953A NL6903953A (xx) 1969-03-14 1969-03-14

Publications (1)

Publication Number Publication Date
US3655935A true US3655935A (en) 1972-04-11

Family

ID=19806416

Family Applications (1)

Application Number Title Priority Date Filing Date
US18084A Expired - Lifetime US3655935A (en) 1969-03-14 1970-03-10 Gas pressure damper means for a circuit breaker mechanism

Country Status (7)

Country Link
US (1) US3655935A (xx)
AT (1) AT299367B (xx)
BE (1) BE747300A (xx)
DE (1) DE1942098B2 (xx)
FR (1) FR2038922A5 (xx)
GB (1) GB1260991A (xx)
NL (2) NL6903953A (xx)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093837A (en) * 1975-07-31 1978-06-06 Westinghouse Electric Corp. Oil circuit-breaker pump-assembly with improved shunting contact structure
US5521569A (en) * 1990-02-23 1996-05-28 Blochouse; Roland Hyper-rapid circuit breaker
CN101689440B (zh) * 2007-07-20 2012-07-04 Abb技术股份公司 用于低压、中压和高压开关装置的带有气体驱动器的断路器
CN102903546A (zh) * 2012-10-22 2013-01-30 中国航天科技集团公司第四研究院第四十一所 一种燃气式直接力作用高压开关作动操作机构
EP3385969A1 (en) * 2017-04-07 2018-10-10 ABB Schweiz AG Gas-insulated circuit breaker and a method for breaking an electrical connection

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3445359A1 (de) * 1984-12-12 1986-06-12 Brown, Boveri & Cie Ag, 6800 Mannheim Mit einer pneumatischen daempfungsvorrichtung ausgestatteter mechanischer kraftspeicherantrieb fuer einen leistungsschalter einer mittelspannungs- oder hochspannungsschaltanlage

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance
US2753424A (en) * 1953-03-10 1956-07-03 Allis Chalmers Mfg Co Interrupting device employing a controller for regulating contact closing speeds
US2775670A (en) * 1953-09-04 1956-12-25 Ite Circuit Breaker Ltd Combined air puffer air buffer for circuit breakers
US2842680A (en) * 1956-03-12 1958-07-08 Gen Motors Corp Electric switch
US3253107A (en) * 1962-05-07 1966-05-24 Siemens Ag Compressed-gas circuit interrupter
US3267231A (en) * 1964-12-31 1966-08-16 Oilgear Co Pressure switch and relief valve combination

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2665351A (en) * 1951-02-09 1954-01-05 Asea Ab Arrangement in air blast circuit breaker provided with damping resistance
US2753424A (en) * 1953-03-10 1956-07-03 Allis Chalmers Mfg Co Interrupting device employing a controller for regulating contact closing speeds
US2775670A (en) * 1953-09-04 1956-12-25 Ite Circuit Breaker Ltd Combined air puffer air buffer for circuit breakers
US2842680A (en) * 1956-03-12 1958-07-08 Gen Motors Corp Electric switch
US3253107A (en) * 1962-05-07 1966-05-24 Siemens Ag Compressed-gas circuit interrupter
US3267231A (en) * 1964-12-31 1966-08-16 Oilgear Co Pressure switch and relief valve combination

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4093837A (en) * 1975-07-31 1978-06-06 Westinghouse Electric Corp. Oil circuit-breaker pump-assembly with improved shunting contact structure
US5521569A (en) * 1990-02-23 1996-05-28 Blochouse; Roland Hyper-rapid circuit breaker
CN101689440B (zh) * 2007-07-20 2012-07-04 Abb技术股份公司 用于低压、中压和高压开关装置的带有气体驱动器的断路器
CN102903546A (zh) * 2012-10-22 2013-01-30 中国航天科技集团公司第四研究院第四十一所 一种燃气式直接力作用高压开关作动操作机构
CN102903546B (zh) * 2012-10-22 2014-12-31 中国航天科技集团公司第四研究院第四十一研究所 一种燃气式直接力作用高压开关作动操作机构
EP3385969A1 (en) * 2017-04-07 2018-10-10 ABB Schweiz AG Gas-insulated circuit breaker and a method for breaking an electrical connection
CN108695105A (zh) * 2017-04-07 2018-10-23 Abb瑞士股份有限公司 用于断开电连接的气体绝缘断路器和方法
US10535480B2 (en) 2017-04-07 2020-01-14 Abb Schweiz Ag Gas-insulated circuit breaker and a method for breaking an electrical connection
CN108695105B (zh) * 2017-04-07 2022-06-07 日立能源瑞士股份公司 用于断开电连接的气体绝缘断路器和方法

Also Published As

Publication number Publication date
AT299367B (de) 1972-06-12
NL135712C (xx)
DE1942098A1 (de) 1970-09-17
DE1942098B2 (de) 1971-12-30
FR2038922A5 (xx) 1971-01-08
BE747300A (fr) 1970-08-17
GB1260991A (en) 1972-01-19
NL6903953A (xx) 1970-09-16

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