US3761661A - Gas blast circuit-breakers having cooperating tubular contact pieces - Google Patents

Gas blast circuit-breakers having cooperating tubular contact pieces Download PDF

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Publication number
US3761661A
US3761661A US00285574A US3761661DA US3761661A US 3761661 A US3761661 A US 3761661A US 00285574 A US00285574 A US 00285574A US 3761661D A US3761661D A US 3761661DA US 3761661 A US3761661 A US 3761661A
Authority
US
United States
Prior art keywords
contact
piece
end portion
contact piece
fingers
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
US00285574A
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English (en)
Inventor
R Boersma
G Irik
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.)
Coq Utrecht Nv
N V Coq Utrecht nl
Original Assignee
Coq Utrecht Nv
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 Coq Utrecht Nv filed Critical Coq Utrecht Nv
Priority claimed from AU52622/73A external-priority patent/AU480335B2/en
Application granted granted Critical
Publication of US3761661A publication Critical patent/US3761661A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H33/02—Details
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/12—Auxiliary contacts on to which the arc is transferred from the main contacts
    • 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
    • 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
    • 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
    • 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
    • H01H33/98—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow
    • H01H33/982—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid the flow of arc-extinguishing fluid being initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow in which the pressure-generating arc is rotated by a magnetic field

Definitions

  • the invention relates to a gas blast circuit-breaker comprising two relatively movable, cooperating, coaxial, tubular contact pieces supported each by a contact holder which is to be connected to the circuit to be closed and opened, the first one of said contact pieces being provided with an externally cylindrical rigid end portion pointing towards the second piece and provided with axial slots for dividing said end portion in parallel axial current paths and with contact surfaces lying in the cylindrical outer surface and separated from one another by said slots and the second one of said contact pieces being provided with a circular series of resilient contact fingers pointing toward the first contact piece and forming parallel axial current paths, said contact fingers having radially inwards facing contact surfaces which are adapted to slide on the contact surfaces of the first contact piece and to cooperate each with one single contact surface of the first contact piece only.
  • a gas blast circuit-breaker of this kind is disclosed in the Swiss Pat. No. 413.960.
  • a switching arc is first produced between the contact surfaces of the main contacts forming parallel current paths, when during the separation of the cooperating contacts said contact surfaces slide away from one another. After the switching arc has a certain length it jumps, under the influence of the magnetic field of the outer circuit which is still closed by the circuit-breaker, from the contact surface of the movable main contact to a split ring which surrounds with ample clearance the fixed contact and is connected to the movable contact. The switching are then extends substantially radially outwards from the contact surface of the fixed contact.
  • the invention has for its object to provide a circuitbreaker of this type, in which directly after the separation of the contact a resulting magnetic field is produced which forces the switching arc immediately after its occurrence from the contact surfaces of said contacts towards the axis of the tubular switching contacts, where said are is quenched by the extinguishing gas.
  • the slotted end portion of the first contact piece is formed on a disc-shaped portion of said contact piece, said disc-shaped portion extending radially outwards in respect of said end portion and having radial slots which connect to the axial slots of the end portion, said discshaped portion being electrically conductively connected near its outer edge to the respective contact holder through an axially extending tubular connecting piece having axial slots connecting to the slots of said disc-shaped portion and the contact fingers of the second contact piece having each at their free ends the.
  • a further amelioration is attained, when the circuibreaker is so constructed that the contact fingers of the circuit-breaker contact piece also have near their free ends radially outwards facing contact surfaces and the first contact piece is provided with an additional circular series of resilient contact fingers connected permanently electrically conductively near their one ends with the first contact piece and cooperating near their other ends with said radially outwards facing contact surfaces of the contact fingers of the'second contact piece, the axial dimensions of the contact fingers of both contact pieces and of the end portion of the first contact piece being so chosen, as to ensure that during the opening process first the cooperating contact fin gers of both contact pieces and there after the contact fingers of the second contact piece and the end portion of the first contact piece are separated from one another.
  • Spaced apart contact holders are designated by l and 2 and they are each connected to an end of the circuit (not shown) which has to be closed and opened by the circuit-breaker.
  • the contact holder 1 supports a fixed contact 3 which is provided with a rigid end portion 4 pointing towards the contact holder 2 and having axial slots 5 for dividing said end portion into parallel axial current paths.
  • the external cylindrical surface of said end portion 4 forms separated contact surfaces 6.
  • the end portion-4 is provided with a layer 7 of material which is resistant to the switching arc.
  • the split end portion 4 is formed on a disc-shaped portion 8 one another and thereafter the fingers 13 are slid off with their contact surfaces 15 from the contact surfaces 6 of the end portion 4.
  • the interruption of the current path through the contact fingers 21 takes place substantially under no-tension conditions, so that the contact surfaces of the fingers 21 and the contact surfaces of the fingers 13 will not be damaged by a switching arc.
  • each contact finger l3 cooperates with one axial lamination of the end portion 4 only, the current will follow at the moment, at which during the opening process the contact fingers 13 and the fixed end portion 4 are separated from one another, a path which is directed axially in a finger 13, radially inwards in the contact block 14 of said finger, again axially in the respective lamination of the end portion 4, radially outwards in the respective sector of the disc-shaped portion 8 and again axially in the respective lamination of the tubular connecting piece 10.
  • This shape of the current path makes that the switching arc set up between a contact finger l3, l4 and the end portion 4 is forced by the produced magnetic field with great force towards the axis of the circuit-breaker, so that the switching arc comes to extend between the arcing rods 22 and 23 shortly after the the separation of the contacts, where after said are is quenched by the extinguishing gas flowing from the outside inwards and escaping through the central passages 24 and 25.
  • a piece of tubing 26 Formed on the annular part 12 of the contact piece 3 is a piece of tubing 26 and the contact piece 17 is provided with a piece of tubing 27.
  • the piece of tubing 27 In the closed condition of the circuit-breaker the piece of tubing 27 is moved on the piece of tubing 26 and then forms together with a packing ring 28 inserted between said pieces of tubing a closed valve which separates the space 29, in which extinguishing gas under high pressure is present or to which extinguishing gas under high pressure can be supplied, from the switching chamber 26 connecting to the discharge passages 24, 25.
  • a gas blast circuit-breaker comprising two relatively axially movable, cooperating, coaxial, tubular contact pieces, two contact holders for connection to the ends of the circuit to be closed and opened, said contact holders each supporting a contact piece, an externally cylindrical rigid end portion formed on one (the first) contact piece, said end portion pointing towards the other (the second) contact piece, axial slots provided in said cylindrical end portion for dividing said end portion into parallel axial current paths, contact surfaces lying in the outer surface of said end portion and separated from one another by said slots, a circular series of separated axially extending, resilient contact fingers forming part of said second contact piece and pointing towards said first contact piece, radially inwards facing contact surfaces formed on said contact fingers and adapted to slide on and off the contact surfaces of the end portion of said first contact piece, each contact surface of one contact piece coopcrating with one contact surface of the other contact piece only, a disc-shaped portion forming part of said first contact piece and connecting to said cylindrical end portion at the end of the latter remote from said second contact piece, said disc
  • a gas blast circuit-breaker as claimed in claim 1, comprising in addition radially outwards facing contact surfaces provided on the contact fingers of said second contact piece at the ends of said fingers facing said first contact piece, an additional circular series of axial resilient contact fingers forming part of said first contact piece and pointing towards said second contact piece, and radially inwards facing contact surfaces provided on the contact fingers of said additional circular series and cooperating with said outwards facing contact surfaces of the contact fingers of said second contact piece, the axial dimension of the contact fingers of said second contact piece and the axial dimensions of the contact fingers and the end portion of said first contact piece being such, that during the switching-off operation first the cooperating contact fingers of both contact pieces are separated from one another and thereafter the contact fingers of said second contact piece are separated from the end portion of said first contact piece.
  • a gas blast circuit-breaker according to claim 2 in which the contact surfaces of the end portion of said first contact piece and the contact surfaces cooperating therewith of the contact fingers of said second contact piece are made of material which is resistant to the switching arc.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Circuit Breakers (AREA)
US00285574A 1971-09-07 1972-09-01 Gas blast circuit-breakers having cooperating tubular contact pieces Expired - Lifetime US3761661A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL7112281.A NL160974C (nl) 1971-09-07 1971-09-07 Persgasschakelaar met samenwerkende buisvormige contactstukken.
US28557472A 1972-09-01 1972-09-01
AU52622/73A AU480335B2 (en) 1973-02-27 Improvements in and relating togas blast circuit-breakers having cooperating tubular contact pieces

Publications (1)

Publication Number Publication Date
US3761661A true US3761661A (en) 1973-09-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00285574A Expired - Lifetime US3761661A (en) 1971-09-07 1972-09-01 Gas blast circuit-breakers having cooperating tubular contact pieces

Country Status (8)

Country Link
US (1) US3761661A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5133256B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) AT308884B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE788385A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2154357C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2152723B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1383180A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL160974C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7607487A (nl) * 1975-08-07 1977-02-09 Westinghouse Electric Corp Drukgasschakelaar van het blaastype.
DE19816509B4 (de) * 1998-04-14 2006-08-10 Abb Schweiz Ag Abbrandschaltanordnung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257532A (en) * 1962-12-17 1966-06-21 Sprecher & Schuh Ag Arc-extinguishing circuit-breakers
US3439140A (en) * 1965-07-28 1969-04-15 Bbc Brown Boveri & Cie Pressure gas operated switch with closed gas circuit
US3639712A (en) * 1969-08-12 1972-02-01 Merlin Gerin Gas blast circuit interrupter having conducting orifice means

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3257532A (en) * 1962-12-17 1966-06-21 Sprecher & Schuh Ag Arc-extinguishing circuit-breakers
US3439140A (en) * 1965-07-28 1969-04-15 Bbc Brown Boveri & Cie Pressure gas operated switch with closed gas circuit
US3639712A (en) * 1969-08-12 1972-02-01 Merlin Gerin Gas blast circuit interrupter having conducting orifice means

Also Published As

Publication number Publication date
NL7112281A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-03-09
AU480335A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-08-29
JPS5133256B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-09-18
DE2154357A1 (de) 1973-03-29
DE2154357B2 (de) 1973-07-05
JPS4836672A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-05-30
FR2152723B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1977-08-26
AT308884B (de) 1973-07-25
DE2154357C3 (de) 1974-01-31
NL160974B (nl) 1979-07-16
GB1383180A (en) 1975-02-05
BE788385A (nl) 1973-01-02
NL160974C (nl) 1979-12-17
FR2152723A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1973-04-27

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