US3671698A - Switch contact chamber for electrical circuit breakers of the gas blast type - Google Patents

Switch contact chamber for electrical circuit breakers of the gas blast type Download PDF

Info

Publication number
US3671698A
US3671698A US53730A US3671698DA US3671698A US 3671698 A US3671698 A US 3671698A US 53730 A US53730 A US 53730A US 3671698D A US3671698D A US 3671698DA US 3671698 A US3671698 A US 3671698A
Authority
US
United States
Prior art keywords
contact member
chamber
cylinder
damping
switch
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
Application number
US53730A
Other languages
English (en)
Inventor
Wilhelm Kramer
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.)
BBC Brown Boveri AG Germany
Original Assignee
Bbc Brown Boveri & Cie
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bbc Brown Boveri & Cie filed Critical Bbc Brown Boveri & Cie
Application granted granted Critical
Publication of US3671698A publication Critical patent/US3671698A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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

Definitions

  • the present invention relates to an improved structure for the switching contact chamber of a circuit breaker of the gas blast type wherein the contacts are actuated to a disengaged position by admission of pressure gas into the switch chamber and are thereafter re-closed automatically following removal of the gas pressure, there being a piston structurally combined with the movable contact member and so arranged in a damping cylinder charged by means of a choke bore with the pressure gas that the opening movement of the contact member is braked by a reduction in the damping volume.
  • circuit breakers of this type occur frequently not only strong impact stresses on the contact members and thus conduct chatter, due to the undamped movement during the contact closing operation, but also because of the differences in the force of the closing spring caused by the tolerances, the closing movements are irregular. This results, for example, in multi-pole devices, not only in differences in the closing times, but also in difierent degrees of wear on the contact members.
  • the object of the present invention is to reduce the closing stresses on the contact members by means of the pressure gas driving the contact members.
  • a second piston is coupled with the movable contact member in gas blastswitches of the above mentioned type, which forms an additional volume in the damping cylinder subdivided by a ring, this volume increasing during the opening of the circuit and decreasing again during the closing, and in that this second piston moves over a supply cross section leading to the volume, so that the latter is charged with pressure gas when it reaches the disconnecting position.
  • the damping cylinder is supported over annular plate springs in the switch chamber housing to reduce the impact stress.
  • the advantages achieved with the invention lie particularly in the fact that a damping volume is formed and charged with the execution of the contact opening process which transforms the kinetic energy of the moving system partly into gas energy during the return of the movable contact members. It is of particular advantage that the closing damping has a selfcontrolling effect.
  • the movement over the supply cross section to the damping volume according to the invention during the closing by the second piston takes place in dependence on the force of the closing air cylinder, so that differences in the force of this air cylinder can be equalized over the additional damping volume according to the invention. Due to this selfcontrolling action, the damping volume for the contact closing process need not drop toward zero, which has the advantage that neither combustion nor stroke tolerances can have a substantial effect on the end velocity.
  • An embodiment of the invention is represented in the accompanying drawing as a part of a switch chamber of a gas blast switch, and is shown in longitudinal section.
  • the movable contact member 1 designed as a nozzle and located in the switch chamber 14 is shown in closed position.
  • a helical spring 2 brings it to the fixed contact member 3 for contacting.
  • the movable contact member 1 to which the pressure is applied moves against the counter force of the spring 2 to the left to separate it from contact member 3.
  • Formed structurally with the movable contact member is a piston 4 which operates in a damping cylinder 5 to create a volume 6 damping the opening movement, which is ventilated over the choke bore 8.
  • This volume 6 is provided with a choke bore 7 for charging with pressure gas.
  • a second piston 10 coupled with the movable contact member, which forms a second volume 12.
  • the piston 10 exposes a bore 13 for the volume 12 acting as a supply cross sec- 1 cylinder 5 is supported by way of annular plate springs 15 in the switch chamber housing.
  • the method of operation of the improved gas blast switch is as follows:
  • a switch contact chamber structure for a circuit breaker of the gas blast type, the combination comprising means forming a chamber to which a pressurized gas can be admitted, a pair of contact members located within said chamber, one of said contact members being movable with respect to the other stationary contact member to effect engagement and disengagement therebetween, spring means biasing said movable contact member into engagement with said stationary contact member in the absence of pressurized gas within said chamber, a damping cylinder located within said switch chamber, the interior of said damping cylinder being subdivided by a ring into first and second damper portions, a first piston forming a part of said movable contact member and which operates within said first damper portion of said cylinder, said first damper portion of said cylinder being provided with a choke bore leading to the switch tion.
  • a second piston located in said second damper portion of said cylinder and which is actuated by said movable contact member in a direction to increase the damping space within said second damper portion as said movable contact member is actuated in the direction away from said stationary contact member and to thereafter decrease the damping space within said second damper portion as said movable contact member is actuated by said spring means in the direction of said stationary contact member to effect contact reclosure, said second damper portion of said cylinder being provided with a choke bore leading to the switch chamber and which is uncovered as said second piston and movable contact member reach the disconnected position of the latter thereby to permit entry of compressed gas from said chamber into said second damper portion.

Landscapes

  • Circuit Breakers (AREA)
  • Fluid-Damping Devices (AREA)
US53730A 1969-07-11 1970-07-10 Switch contact chamber for electrical circuit breakers of the gas blast type Expired - Lifetime US3671698A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691935298 DE1935298A1 (de) 1969-07-11 1969-07-11 Schaltkammer fuer Druckgasschalter mit impulsartig betaetigten Schaltstuecken

Publications (1)

Publication Number Publication Date
US3671698A true US3671698A (en) 1972-06-20

Family

ID=5739565

Family Applications (1)

Application Number Title Priority Date Filing Date
US53730A Expired - Lifetime US3671698A (en) 1969-07-11 1970-07-10 Switch contact chamber for electrical circuit breakers of the gas blast type

Country Status (5)

Country Link
US (1) US3671698A (de)
CH (1) CH501991A (de)
DE (1) DE1935298A1 (de)
FR (1) FR2054324A5 (de)
GB (1) GB1272388A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711950A1 (de) * 2012-09-25 2014-03-26 ABB Technology Ltd Aktuator für einen Lastschalter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946210A (en) * 1959-06-05 1964-01-08 Reyrolle A & Co Ltd Improvements relating to gas-blast electric circuit-breakers
US3277263A (en) * 1962-10-29 1966-10-04 Hitachi Ltd Resistance contact device for air-blast circuit breakers
US3286066A (en) * 1963-10-17 1966-11-15 Bbc Brown Boveri & Cie Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby
US3374320A (en) * 1965-11-02 1968-03-19 Bbc Brown Boveri & Cie Tap-changing device for transformers having load current diverter means and improved hydraulic follower mechanism therefor
US3536889A (en) * 1964-12-10 1970-10-27 Sachsenwerk Licht & Kraft Ag Electrical switch actuating mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946210A (en) * 1959-06-05 1964-01-08 Reyrolle A & Co Ltd Improvements relating to gas-blast electric circuit-breakers
US3277263A (en) * 1962-10-29 1966-10-04 Hitachi Ltd Resistance contact device for air-blast circuit breakers
US3286066A (en) * 1963-10-17 1966-11-15 Bbc Brown Boveri & Cie Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby
US3536889A (en) * 1964-12-10 1970-10-27 Sachsenwerk Licht & Kraft Ag Electrical switch actuating mechanism
US3374320A (en) * 1965-11-02 1968-03-19 Bbc Brown Boveri & Cie Tap-changing device for transformers having load current diverter means and improved hydraulic follower mechanism therefor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2711950A1 (de) * 2012-09-25 2014-03-26 ABB Technology Ltd Aktuator für einen Lastschalter
WO2014048752A1 (en) * 2012-09-25 2014-04-03 Abb Technology Ltd Actuator for a tap changer
KR20150048926A (ko) * 2012-09-25 2015-05-07 에이비비 테크놀로지 리미티드 탭 절환기용 액추에이터
CN104956456A (zh) * 2012-09-25 2015-09-30 Abb技术有限公司 用于抽头变换器的促动器
US9324493B2 (en) 2012-09-25 2016-04-26 Abb Technology Ltd Actuator for a tap changer

Also Published As

Publication number Publication date
FR2054324A5 (de) 1971-04-16
DE1935298A1 (de) 1971-01-14
CH501991A (de) 1971-01-15
GB1272388A (en) 1972-04-26

Similar Documents

Publication Publication Date Title
US3985988A (en) Electric circuit breaker assembly
US4956738A (en) Very high speed circuit breaker assisted by semiconductors
US2783338A (en) Operating mechanism for a fluid-blast circuit breaker
US2803724A (en) Operating device for air blast circuit breakers
GB764647A (en) Improvements in air blast electric circuit breakers
US2292096A (en) Circuit-breaker operating system
US3671698A (en) Switch contact chamber for electrical circuit breakers of the gas blast type
US2920607A (en) Hydraulically-actuated operating mechanism for an electric circuit breaker
US2420889A (en) Circuit interrupter
US3017482A (en) Air or gas blast electric circuit breakers
US3180960A (en) Bounce suppressing arrangement for electrical contacts
US3118996A (en) Contact operating means for air blast circuit breaker
US3745283A (en) Electrical compression switch
GB723156A (en) Improvements in and relating to gas blast electric circuit breakers
US2919329A (en) Air blast circuit breakers
US3787648A (en) Tank-type gas-break circuit breaker
US3300610A (en) Anti-restriking oil circuit breaker having an anti-cavitation device
US2418739A (en) Circuit breaker operating system
GB868000A (en) Improvements in or relating to circuit breakers
US2374062A (en) Circuit breaker
US3094601A (en) Operating device for the movable contact of the main braking gap in an air blast circuit breaker
GB1049497A (en) Improvements in and relating to gas blast circuit breakers
US2753424A (en) Interrupting device employing a controller for regulating contact closing speeds
US2965072A (en) Driving means for circuit breakers
US3134875A (en) Rebound preventing means in air blast circuit breaker