US3286066A - Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby - Google Patents

Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby Download PDF

Info

Publication number
US3286066A
US3286066A US396093A US39609364A US3286066A US 3286066 A US3286066 A US 3286066A US 396093 A US396093 A US 396093A US 39609364 A US39609364 A US 39609364A US 3286066 A US3286066 A US 3286066A
Authority
US
United States
Prior art keywords
contact
exhaust valve
contact member
seat
circuit breaker
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
US396093A
Other languages
English (en)
Inventor
Floessel Carl Dieter
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
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
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 France SA filed Critical BBC Brown Boveri France SA
Application granted granted Critical
Publication of US3286066A publication Critical patent/US3286066A/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
    • 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
    • H01H33/80—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve
    • H01H33/82—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid flow of arc-extinguishing fluid from a pressure source being controlled by a valve the fluid being air or gas
    • 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
    • H01H33/53—Cases; Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Accessories therefor, e.g. safety arrangements, pressure relief devices
    • H01H33/56—Gas reservoirs

Definitions

  • the present invention relates to an arrangement for operating the gas exhaust valves in gas blast circuit breakers in which the arcing chambers are permanently filled with gas under pressure and contain nozzle-shaped contact pairs, each contact being associated with a gas exhaust valve and one of said contacts of each pair being directly actuated, whereas the other is spring loaded and yieldingly mounted in relation thereto to permit its participation in part of the breaking motion of the movable contact before the two contacts actually separate.
  • Gas blast circuit breakers are known in which the rupturing means have the form of a twin break contact device.
  • the nozzle-shaped contacts are located inside a chamber which is kept continuously under gas pressure. When the circuit is broken, contact separation is achieved by either one or both contacts being actuated and the resultant arc is quenched by a gas blast.
  • each nozzle-shaped contact is associated with a gas exhaust valve at its exhausting end, said valve being closed when the circuit breaker is closed and briefly opened when the contacts break, permitting the pressurized gas in the arcing chamber to escape through the interior of the nozzle-shaped contacts to the outside and thereby to extinguish the arc by the blast of gas entering the nozzle.
  • the gas exhaust valves are controlled pneumatically or hydraulically in such a way that one gas exhaust valve is operated by a device kept at ground potential, whereas the other gas exhaust valve is pneumatically or hydraulically
  • the circuitbreaker is in rupturing position the insulating pipe is at high potential and this gives rise to the familiar problem of current creep. This is particularly difiicult to control if the circuit breaker is of .a kind in which the voltage ruptured by each break is relatively high, say 110 kv.
  • the invention concerns an arrangement in which one of the contacts is likewise thus yieldingly mounted.
  • the object contemplated by the invention is to provide a solution of the problem of operating the gas exhaust valve without the use of an insulating transmission member.
  • the invention proposes to construct the movable valve member of the gas exhaust valve associated.
  • FIG. 1 is a sectional elevation of an arrangement in which the exhaust gas valve associated with one of the breaking contacts and its control means are shown partly in section, whereas in FIG. 2 the same arrangement is shown in an intermediate position during separation of the breaking contacts.
  • FIG. 3 is the same arrangement in interrupting position.
  • FIG. 1 the movable nozzle-shaped breaking contact is indicated at 1.
  • 2 is the usually stationary, likewise nozzle-shaped breaking contact firmly attached to an intermediate member 3 which is slidably mounted between a movable exhaust valve member 4 and the cover 5 of the valve casing 6.
  • a thimble-shaped sliding bushing 7 which is bolted to cover 5 by screws 8 supplies current to contact 2.
  • Supported by webs 9 a valve seat 10 is contained in valve casing 6, the seat together with valve member 4 forming the gas exhaust valve.
  • a sealing ring 4a is countersunk in the flared lip 4b of valve member 4.
  • the valve casing 6 further contains an insertion 11 formed at its lower end with ribs 11a for supporting the insertion inside valve casing 6.
  • annular channel 12 which communicates on the one hand with the exhaust 6a of valve casing 6 and on the other hand through a channel 14a in a partition 14 with a chamber 13.
  • the partition 14 contains another channel 14b through which two chambers 15 and 16 communicate.
  • a sealing ring 17 is inserted into the partition.
  • An annular valve seat 18 is firmly let into insertion 11 and carries a sealing ring 19.
  • a movable valve member 20 which has the shape of an annulus is slidably contained between part 4 and part 14 and in cooperation with sealing rings 17 and 19 forms a servo valve.
  • the two chambers 13 and 21 communicate through an opening 200 in valve 20.
  • a spring 22 is interposed between partition 14 and intermediate member 3, whereas, a further spring 23 is located between partition 14 and a damping piston 24.
  • the top of intermediate member 3 has an inner recess and embraces a circular clip 25 inserted into a groove in valve member 4.
  • Cover 5 is firmly attached to valve casing 6 by screws 26. Through an opening 5a in cover 5 chamber 16 is in permanent communication with the interior 27 of the arc chamber which in the drawing is not specially indicated.
  • FIGS. 2 and 3 parts also shown in FIG. 1 are identified by the same reference numbers.
  • FIG. 1 the two breaking contacts 1 and 2 are shown in contacting position. Apart from chamber 27, the two chambers 15 and 16 as well as the interiors of the breaking contacts 1 and 2 contain a pressurized gas at a given normal pressure. The pressure in chambers 13 and 21 is atmospheric because they are in communication with the ambient atmosphere through channel 14a, channel 12 and the gas exhaust 6a.
  • breaking contact 1 is raised by actuating means not shown in the drawing. Urged by spring 22 the other breaking contact 2 first participates in this movement, spring 22 thrusting the intermediate member 3 and contact 2 which is firmly connected thereto upwards so that the two contacts 1 and 2 do not at first break.
  • the movable valve member 4 of the gas exhaust valve is likewise arranged to participate in this movement.
  • Valve member 4 functions in the manner of a differential piston. In closing position an upward pneumatic thrust acts on an inner section of the valve member of diameter d This is only partly balanced by a downward pneumatic thrust acting on an outer cross section of diameter d The difference between the two thrusts therefore pushes valve member 4 upwards, sealing ring 4a being lifted off valve seat 10 and thereby permitting the gas in the interior of the breaking contacts 1 and 2 to exhaust through 611 to the outside. Since the inside of the movable breaking contact 1 is likewise associated with a conventional exhaust valve (not shown) which is opened by the initiation of the breaking movement, the interior of the two contacts is simultaneously exhausted upwards through contact 1. As illustrated in FIG.
  • valve member 4 the upper limit of displacement of valve member 4 and of contact 2 is reached when a shoulder 40 on valve member 4 has' lifted the movable valve member 20 of the servo valve against sealing ring 17 and shoulder 3a of the intermediate member 3 bears against the circular clip 25.
  • contact 1 continues to rise, FIG. 2, until an arc extinction gap a has opened between the two breaking contacts 1 and 2.
  • a gas blast is produced across the arc between the two contacts, said gas blast being due to gas streaming from chamber 27, as indicated by arrows, through the interior of the breaking contacts and valve member 4 out into the atmosphere from exhaust 6a.
  • the exhaust valve' 4, 10 must reclose.
  • valve member 4 of the exhaust valve and the yielding contact 2 being coupled by parts 25 and 3 in such a way that the closing valve member 4 can entrain contact 2.
  • the movable contact 1 is lowered by its associated actuating means.
  • this contact has closed gap b contact 2 is entrained by contact 1 and depressed, intermediate member 3 and the movable valve member 20 of the servo valve participating in this yielding downward motion until the position illustrated in FIG. 1 has been reestablished.
  • chamber 21 exhausts to the outside through opening 20a, chamber 13, channel 14a, channel 12 and exhaust opening 6a.
  • valve member 20 of the servo valve in the form of an annular member which concentrically surrounds the movable valve member 4 of the gas exhaust valve.
  • Exhaust valve, servo valve and the yielding breaking contact can thus be conveniently assembled to form one structural unit which can be easily held in position from one end of the arcing chamber, for instance by the cupshaped part forming exhaust 6a.
  • the novel arrangement has the further advantage of permitting the break between the contacts to be opened in a desirable manner in two stages, although the rupturing movement of the movable contact is quite continuous.
  • the actuating means associated with the latter can therefore be of simple and inexpensive construction.
  • a gas blast circuit breaker comprising a chamber having a continuous filling of pressurized gas, first and second nozzle type contact members disposed within said chamber, said first contact member being actuatable towards and away from said second contact member to effect engagement and disengagement respectively of said contact members, said second contact member including spring means establishing a yieldable mounting therefor enabling said second contact member to follow said first contact member for a predetermined distance without separating therefrom during an initial opening phase of the circuit breaker, a gas exhaust valve correlated to the interior of said second contact member and which serves when open to discharge to atmosphere the pressurized gas flowing through said second contact member from said chamber when said contact members become disengaged, said exhaust valve including a valve seat and a movable valve member constituted as a pressure differential piston, said exhaust valve member being held against its seat by said second contact member when said contact members are engaged, and a servo valve including first and second seats and a valve member actuatable in one direction to engage said first seat by movement of said exhaust valve member to the open position and actuatable
  • a gas blast circuit breaker comprising a chamber having a continuous filling of pressurized gas, first and second nozzle type contact members disposed within said chamber, said first contact member being actuatable towards and away from said second contact member to effect 5. engagement and disengagement respectively of said contact members, said second contact member including spring means establishing a yieldable mounting therefor enabling said second contact member to follow said first contact member for a predetermined distance without separating therefrom during an initial opening phase of the circuit breaker, a gas exhaust valve correlated to the interior of said second contact member and which serves when opened to discharge to atmosphere the pressurized gas flowing through said second contact member from said chamber when said contact members become disengaged, said exhaust valve including a valve seat and a movable valve member constituted as a pressure differential piston, said exhaust valve member being held against its seat by pressure exerted on said second contact member by said first contact member when said contact members are engaged, and a servo valve for said exhaust valve actuatable in one direction to a first position by yielding movement of said second contact member during

Landscapes

  • Circuit Breakers (AREA)
US396093A 1963-10-17 1964-09-14 Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby Expired - Lifetime US3286066A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1275063A CH403011A (de) 1963-10-17 1963-10-17 Einrichtung zur Steuerung von Auslassventilen bei Druckgasschaltern

Publications (1)

Publication Number Publication Date
US3286066A true US3286066A (en) 1966-11-15

Family

ID=4386046

Family Applications (1)

Application Number Title Priority Date Filing Date
US396093A Expired - Lifetime US3286066A (en) 1963-10-17 1964-09-14 Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby

Country Status (4)

Country Link
US (1) US3286066A (de)
AT (1) AT258397B (de)
CH (1) CH403011A (de)
GB (1) GB1049497A (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339046A (en) * 1964-05-25 1967-08-29 Bbc Brown Boveri & Cie Blast valve arrangement for compressed gas operated circuit breakers
US3564177A (en) * 1967-08-18 1971-02-16 English Electric Co Ltd Dual gas-blast circuit interrupter in which one of two exhaust valves operates automatically
US3671698A (en) * 1969-07-11 1972-06-20 Bbc Brown Boveri & Cie Switch contact chamber for electrical circuit breakers of the gas blast type
US3686454A (en) * 1968-09-16 1972-08-22 Lee E Berkebile Gas-blast circuit interrupter with primary and secondary blast valves
US3725623A (en) * 1968-10-28 1973-04-03 Westinghouse Electric Corp Gas-blast downstream-type of high-voltage circuit breaker having field-controlling shields and single venting movable contact
US4105881A (en) * 1976-07-29 1978-08-08 Westinghouse Electric Corp. Circuit breaker apparatus with static pressure lock
US4715526A (en) * 1986-11-20 1987-12-29 General Dynamics, Pomona Division Floating seal and method of its use

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE25631E (en) * 1951-02-09 1964-08-18 Air blast circuit breaker

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE25631E (en) * 1951-02-09 1964-08-18 Air blast circuit breaker

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3339046A (en) * 1964-05-25 1967-08-29 Bbc Brown Boveri & Cie Blast valve arrangement for compressed gas operated circuit breakers
US3564177A (en) * 1967-08-18 1971-02-16 English Electric Co Ltd Dual gas-blast circuit interrupter in which one of two exhaust valves operates automatically
US3686454A (en) * 1968-09-16 1972-08-22 Lee E Berkebile Gas-blast circuit interrupter with primary and secondary blast valves
US3725623A (en) * 1968-10-28 1973-04-03 Westinghouse Electric Corp Gas-blast downstream-type of high-voltage circuit breaker having field-controlling shields and single venting movable contact
US3671698A (en) * 1969-07-11 1972-06-20 Bbc Brown Boveri & Cie Switch contact chamber for electrical circuit breakers of the gas blast type
US4105881A (en) * 1976-07-29 1978-08-08 Westinghouse Electric Corp. Circuit breaker apparatus with static pressure lock
US4715526A (en) * 1986-11-20 1987-12-29 General Dynamics, Pomona Division Floating seal and method of its use

Also Published As

Publication number Publication date
GB1049497A (en) 1966-11-30
AT258397B (de) 1967-11-27
CH403011A (de) 1965-11-30

Similar Documents

Publication Publication Date Title
US2748226A (en) Compressed-gas circuit interrupter
US2933575A (en) Circuit interrupters
US4086461A (en) High-voltage circuit-interrupters
US3009042A (en) Circuit interrupters
US3286066A (en) Gas blast circuit breaker with spring mounted hollow contact member and associated exhaust valve controlled thereby
US2957063A (en) Pumped-gas circuit interrupter
US2794886A (en) Electric circuit breakers of the air or gas-blast type
US3043940A (en) Compressed-gas circuit interrupter
US2581571A (en) Circuit interrupter
US3991292A (en) Dual compression puffer interrupter
US3290469A (en) Compressed-gas circuit interrupter having cavitation means
US3240910A (en) Gas blast circuit breaker with stationary spaced tubular contacts and piston actuated contact bridge including blast valve actuated thereby
US3379849A (en) Dual-pressure gas-blast circuit breaker with piston means and interrupting unit in closed tank
US3440379A (en) Gas-blast circuit breaker with multiple interruption
US2919329A (en) Air blast circuit breakers
US3439140A (en) Pressure gas operated switch with closed gas circuit
US3339046A (en) Blast valve arrangement for compressed gas operated circuit breakers
US3284602A (en) Compressed-gas circuit interrupters
US4511776A (en) Break chamber for a gas-blast circuit breaker
US3014111A (en) Pneumatic operating means for circuit breakers
GB1294063A (en) Gas-blast circuit breaker
US2671144A (en) Circuit interrupter
US2970198A (en) Compressed-gas circuit interrupter
US3246108A (en) Arc-extinguishing structure and tank housing for a compressed-gas circuit interrupter
US3236983A (en) Compressed gas circuit breaker with quick opening contacts