US3553406A - Circuit-breaker operable by extinguishing gas pressure differential - Google Patents

Circuit-breaker operable by extinguishing gas pressure differential Download PDF

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Publication number
US3553406A
US3553406A US716808A US3553406DA US3553406A US 3553406 A US3553406 A US 3553406A US 716808 A US716808 A US 716808A US 3553406D A US3553406D A US 3553406DA US 3553406 A US3553406 A US 3553406A
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US
United States
Prior art keywords
circuit breaker
piston
passage
cylinder
space
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
US716808A
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English (en)
Inventor
Rintje Boersma
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COQ NV
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COQ NV
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Publication date
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Publication of US3553406A publication Critical patent/US3553406A/en
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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
    • H01H33/70—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
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • 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
    • H01H33/302—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator for fluid insulated switchgear, wherein the insulating fluid is also the working fluid
    • 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7038—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by a conducting tubular gas flow enhancing nozzle
    • 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
    • H01H33/83—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 wherein the contacts are opened by the flow of air or gas

Definitions

  • ABSTRACT A gas blast circuit breaker comprising at least Netherlands two cooperating movable contacts, of which each one is at- 6705277 tached to a piston adapted to be driven by the extinguishing gas, the stroke of one contact and its piston being smaller than that of the other contact and its piston, the piston having the [54] smallest stroke being used to start the opening operation of 3C1 3 D" g the circuit breaker and to open a valve, the opening of said Wm: valve allovving extinguishing gas to escape and to extinguish [52] [1.8.
  • said contacts being formed as a nozzle contact and cooperating with a valve system which separates the switching chamber from the discharge space, when the circuit breaker is in its closed position, but connects during the opening operation the switching chamber and the discharge space with one another so as to allow the extinguishing gas to escape from the switching chamber to the discharge space and thereby to extinguish the switching arc, said switching contacts being both adapted to be moved and being each coupled for their movement with acylinder-piston system driven by the extinguishing gas, said contacts being, during the opening operation, first driven together and in engagement with one another in the opening direction through a part of the opening stroke and thereupon separated from one another owing to the arrest of 'the switching contact which, in'respect of the opening thecylinder-piston system of the rearmost switching contact and thereupon by its own cylinder-piston system.
  • a gas blast circuit breaker of thiskind is disclosed in the British Pat. specification 821,069.
  • the switching chamber is supplied with compressed extinguishing gas from the outside, when the circuit breaker has to break the electric circuit. Consequently, the extinguishing gas is not at once available to move the switching contacts in the opening direction.
  • only one of the two cooperating switching contacts can be formed as a nozzle contact.
  • many passages and slide valve members must be exactly attuned to one another, which makes the construction of the circuit breaker complicate. Alteration of the duration of the gas blast is not possible without drastic. modification of several details of the circuit breaker.
  • the circuit breaker remains in the opened condition till the supply of extinguishing gas to the switching chamber is cut off and the pressure in said chamber is brought back to the original low value.
  • the invention has for its object to provide a gas blast circuit breaker of the mentioned kind, in which the switching chamber is already filled with extinguishing gas under high pressure in the condition of rest of the circuit breaker, both cooperating switching contacts may be formed as nozzle con-' tacts and the duration of both the gas blast and the complete switching cycle can be adapted in a simple manner to the prevailing conditions.
  • the cylinder of the cylinder-piston system of the form foremost switching contact 1 is a double acting cylinder, of which, during the switching operation, the cylinder space meant for the closing movement of said contact is supplied with compressed extinguishing gas from the switching chamber a predetermined space of time after the cylinder space of the cylinder-piston system coupled with the rearmost switching contact and meant for starting the opening operation has been supplied with gas from said chamber, so as to enable the closing. spring to move the foremost switching contact again towards the rearmost switching contact, to close again the valve system between the switching chamber and the discharge space and to restore the circuit breaker to its closed condition.
  • the switching chamber contains already in the condition of rest extinguishing gas under high pressure, so that extinguishing gas is directly available for each opening operation. Moreover, the blast of extinguishing gas is maintained till the circuit breaker has been closed again. This is of great importance, when the electric circuit is not interrupted in time by the isolator switch connected in'series and cooperating with the circuit breaker. 1
  • the latter may be constructed in such a manner, that the cylinder space of the cylinderpiston system coupled with the rearmost switching contact and meant for starting the opening operation and the cylinder space of the cylinder-piston system coupled with the foremost switching contact and means meant for the closing operation are each connected to a passage comprising a throwover valve adapted to connect the relevant cylinder space either with the high-pressure switching chamber or with a low-pressure space, the first one of said throwover valves controlling the rearmost switching contact being operablefrom the outside and the second one of said throwover valves controlling the foremost switching contact being operated by a spring and a cylinderpiston system, of which the active cylinder space communicates through a conduit having a delaying action with the said cylinder space of the cylinder-piston system coupled with the rearmost switching contact.
  • the first throwover valve is brought into the position, in
  • the second throwover valve is brought a predetermined space of time later into the position, in which the cylinder space cooperating with the foremost switching contact and meant for the closing operation is also supplied with extinguishing gas from the switching chamber and the circuit breaker is restored to its closed condition.
  • the cylinder space of the cylinder-piston system coupled with the foremost switching contact and meant for the closing operation is connected to a passage comprising a throwover valve adapted to connect said cylinder space either with the high-pressure switching chamber or with a low-pressure space and said throwover valve is operated by a spring and a cylinder-piston system, of which the active cylinder space communicates through a conduit having a delaying action with a chamber on the low-pressure side of the valve system cooperating with the switching contacts and provided between the switching chamber and the discharge side.
  • the chamber on the low-pressure side of said valve system is provided between said valve system and the inlet opening of the or each nozzle contact.
  • the cylinder space of the rearmost switching contact can be discharged directly after the latter contact has been reached its stop member during the opening operation, so that the rearmost switching contact is restored to its position of rest by the pressure of the extinguishing gas and, if necessary, by stabilization spring, before the foremost switching contact has ended the reclosing movement or even has started said movement.
  • the foremost switching contact then cannot bump against the rearmost switching contact with appreciable force, so that the danger of damaging the lining of the switching contacts, said lining, consisting for instance of abrittle sintered tungsten-alloy, is considerably reduced.
  • ln-ithe drawing 1 is a-metal vesselto be connected with i earth, in which an inner wall is provided which consists of insulators2,3, 4 and contact rings 5, 7.
  • the space7 between the vessel and said-inner wall is filledwith insulatingmaterial of high dielectric strength.
  • the switching element is mountedJ'This-element is held in j place by insulators 8, 9 and provided with electrically-conductive contact holders 10, 11, which are electrically conductively connected through connecting contacts 12,13 with' the contact rings 5,'6. Attached to these-contact rings 5,6 are the connecting conductors 14,15 for the connection of the circuit breaker with the outer electric circuitIThis circuit'breaker'is only meant to interrupt the circuit. To keep the circuit open and to close the circuit an isolator switch (not shown) must be connected in series with the circuit breaker.
  • the time interval between the filling of the cylinderspace 42 and the filling of'the cylinder space 48 with extinguishing gas under high pressure is so chosen by adjusting the delaying action of conduit 57 as to guarantee that the contacts 21 and 26 are kept spaced 'apartat' maximum distance a'sufficient space of time to extinguish the switching arc bythe escaping gas.
  • the tube 57 of the circuit breaker shown in FIG. 3 is connected to a chamber 63 through a conduit 60 comprising a choke opening 61, of which the cross-sectional area can be adjusted by means of an adjusting screw 62.
  • This chamber 63 is located on the low-pressure side, that means on the side remote from the high-pressure switching chamber 33, of the valve-system 31, 32 and in front of the inlet openings of the nozzle or switching contacts 21, 26.
  • valve 50 is pulled in the right-hand end position a predetermined space of time after the opening of the valve system 31, 32. ln that position of said valve the cylinder space 48 is connected to the high-pressure switching chamber 33. It will be apparent that valve 50 will be restored to its position of rest only after the valve 1 system 31, 32 has been closed again at the end of the closing stroke of the contact 21. This means, that the pull-rod 58 may be released directly after the nozzle or switching contact 26 has been arrested, during the opening operation of the circuit breaker, by the stop member 30, so .that the valve 44 is brought back into its left-hand position much earlier.
  • the nozzle or switching contact 26 Since in that position the cylinder space 42 communicates again with the lowpressure space 38 the nozzle or switching contact 26 is driven back with great speed by the high-pressure extinguishing gas escaping from the switching chamber 33 and the spring 59 and it will then reach its position of rest long before the nozzle or switching contact 21 has completed its opening stroke and the following reclosing stroke. As in the closed position of the circuit breaker the nozzle or switching contacts 21, 26 do not touch each other, the danger of forcing, during the reclosing operation of the circuit breaker, the nozzle or switching contact 21 with great force against the returning nozzle or switching contact 26 and damaging thereby the protective linings 64, 65 of the contact surfaces exposed to the switching arc is avoided with certainty.
  • a gas blast circuit breaker comprising a container, at least two concentric compartments formed in said container, the outer compartment being filled with extinguishing gas under high overpressure, at least one pair of cooperating movable contacts accommodated in the inner compartment, at least one of said contacts being a nozzle contact having a central passage for the discharge of extinguishing gas during the opening operation of the circuit breaker, two cylinders, two pistons each piston being mounted for reciprocation in a cylinder, the first movable contact being attached to one of said pistons, the second movable contact being attached to the other one of said pistons, the stroke of the first movable contact and its piston being smaller than the stroke of the second movable contact and its piston, at least one spring, said pistons being adapted to be driven in the direction, in which the circuit breaker is opened, by the extinguishing gas, said spring being adapted to drive said pistons in the direction, in which the circuit breaker is closed, a valve surrounding said inner compartment and being constituted by two cooperating annul
  • a gas blast circuit breaker as claimed in claim 1 in which the conduit having a delaying action connects the active cylinder space of said third cylinder with the inner compartment.

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  • Circuit Breakers (AREA)
US716808A 1967-04-14 1968-03-28 Circuit-breaker operable by extinguishing gas pressure differential Expired - Lifetime US3553406A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6705277A NL126949C (enrdf_load_stackoverflow) 1967-04-14 1967-04-14

Publications (1)

Publication Number Publication Date
US3553406A true US3553406A (en) 1971-01-05

Family

ID=19799847

Family Applications (1)

Application Number Title Priority Date Filing Date
US716808A Expired - Lifetime US3553406A (en) 1967-04-14 1968-03-28 Circuit-breaker operable by extinguishing gas pressure differential

Country Status (5)

Country Link
US (1) US3553406A (enrdf_load_stackoverflow)
DE (1) DE1665258B1 (enrdf_load_stackoverflow)
GB (1) GB1217053A (enrdf_load_stackoverflow)
NL (1) NL126949C (enrdf_load_stackoverflow)
SE (1) SE348595B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4734088A (en) * 1985-09-03 1988-03-29 Windmoller & Holscher Apparatus for making bags
EP2985775A1 (en) * 2014-08-12 2016-02-17 GE Energy Power Conversion Technology Ltd Circuit Breakers

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1270584A (fr) * 1960-07-18 1961-09-01 Merlin Gerin Perfectionnements aux disjoncteurs pneumatiques ayant au moins un contact tubulaire

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB828589A (en) * 1957-05-23 1960-02-17 Asea Ab Air-blast electric circuit-breaker
FR1394634A (fr) * 1964-04-03 1965-04-02 Nv Perfectionnements apportés aux disjoncteurs à gaz sous pression
DE1238545B (de) * 1964-05-28 1967-04-13 Merlin Gerin Druckgasschalter mit mindestens einem rohrfoermigen Kontakt

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1270584A (fr) * 1960-07-18 1961-09-01 Merlin Gerin Perfectionnements aux disjoncteurs pneumatiques ayant au moins un contact tubulaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4734088A (en) * 1985-09-03 1988-03-29 Windmoller & Holscher Apparatus for making bags
EP2985775A1 (en) * 2014-08-12 2016-02-17 GE Energy Power Conversion Technology Ltd Circuit Breakers

Also Published As

Publication number Publication date
DE1665258B1 (de) 1971-06-09
SE348595B (enrdf_load_stackoverflow) 1972-09-04
NL6705277A (enrdf_load_stackoverflow) 1968-10-15
NL126949C (enrdf_load_stackoverflow) 1967-04-14
GB1217053A (en) 1970-12-23

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