US3567885A - Isolator switch with bridging resistance and extinguishing gas control - Google Patents

Isolator switch with bridging resistance and extinguishing gas control Download PDF

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Publication number
US3567885A
US3567885A US753612A US3567885DA US3567885A US 3567885 A US3567885 A US 3567885A US 753612 A US753612 A US 753612A US 3567885D A US3567885D A US 3567885DA US 3567885 A US3567885 A US 3567885A
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United States
Prior art keywords
contact
arcing
main
main contact
contacts
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Expired - Lifetime
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US753612A
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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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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
    • H01H33/04—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
    • H01H33/16—Impedances connected with contacts
    • H01H33/166—Impedances connected with contacts the impedance being inserted only while closing the switch
    • 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

Definitions

  • a gas blast circuit-breaker for isolating purposes and switching normal loads only comprising a fixed main contact, a movable main contact cooperating therewith and two cooperating movable arcing contacts, of which the first one is rigidly connected with the movable main contact and the second one is electrically connected with the fixed main contact and is adapted to move, during the switching-off operation, together and in contact with the first arcing contact till a little past the separation of the main contacts, said second arcing contact being formed as a nozzle contact, the passage of which is opened during the switching-off operation as to allow extinguishing gas to escape from the switching chamber to quench the switching are set up between the arcing contacts after their separation.
  • the invention relates to an electric circuit-breaker for high voltage comprising a switching chamber filled with extinguishing gas under high pressure, in which-a fixed main contact and a movable main-contact cooperates therewith and also two cooperating arcing contacts, each one electrically conductively connected with a main contact, are provided, at least one of said arcing contacts being movably mounted, in such a manner, as to remain, during the switching-off operation, in contact with the other arcing contact till a little past the interruption of the current path through the main contacts, and at least one of the contacts, all of which are provided in the switching chamber, being constructed as a closable nozzlecontact which is opened during the switching-off operation and then allows extinguishing gas to pass from the switching chamber to a space, in which the pressure is lower.
  • Such a circuit-breaker is particularly adapted. for combination with a power circuit-breaker which is exclusively used for the interruption of the circuit.
  • the meant circuitbreaker operates as an'isolating switch to keep the circuit interrupted and to close same.
  • it can also be usedin other places of a switch-gear plant as an isolating switch which is adapted to operate under normal load.
  • the invention has for its object to provide a circuit-breaker of the kind referred to, which has a simple and compact structure in respect of known circuit-breakers and is easily controlled, in such a manner, that during the switching-off operation only a little quantity of extinguishing gas is spent to quench the switching arc.
  • the arcing contact which is electrically conductively connected with the fixed main contact, is constructed as a closable nozzle-contact adapted to be moved'with respect to said fixed main contact and to be driven, during the switching-off operation, in the switching-off direction of the movable main contact and said nozzle-contact then being moved together with the movable main contact through a part of the stroke of'the latter only and beingopened by said movement.
  • the invention allows a construction, in which the arcing contact acting as a nozzle-contact is driven'by a single-acting cylinder-piston-system in the switching-off direction and by a spring in the opposite direction.
  • the nozzle-contact can be easily returned, during the switching-off operation, to the position of rest at the desired point of time, so that the passage provided in said contact is closed and extinguishing gas cannot flow out of the switching chamber anymore.
  • this nozzle-contact may cooperate with its end face remote from the movable main contact and from the switching chamber with a fixed seating surface and it may be so controlled as to be forced, in both end positions of the circuit-breaker, with said end face against said seating surface so as to close its passage. Only when, during the'switching-off operation, the nozzle-contact moves along together. with the movable main contact and the arcing contact attached thereto, the valve constituted by said end face and said seating surface is opened and extinguishing gas to quench the switching arc escapes from the switching chamber.
  • circuit-breaker constructed. in accordance with'the invention may be. provided with a bridging resistance in a simple manner and that the provision of such a resistance hardly requires additional space in the circuit-breaker.
  • the circuit-breaker, provided' with abridging resistance is constructed, in.
  • the movable main contact is first brought into contact. with the intermediate contact only, whereby the bridging resistance is switched in. A little later the arcing contacts and still somewhat later the movable main contact are brought into contact with the fixed main contact. Consequently, in the switched-in condition of the circuit-breaker the bridging resistance is short-circuited.
  • the invention will.be further elucidated with the aid of the drawing, which shows, by way of example, an axial sectional view of the switching element of an isolating switch constructed in accordance with the invention and provided with bridging resistance.
  • drawing 1 is a contact holder which is held in place by insulators 2,3,4 in a metal casing (not shown) to be connected with earth and which is electrically conductively connected (in a manner not shown either) with the circuit to be controlled by the circuit-breaker.
  • the contact holder 1 supports a holder 5 provided with a number of contact fingers 6 arranged in a circular. row which are in permanent contact with a tubularmovable main contact 7.
  • a second contact holder 8 which is also rigidly secured in the said casing by insulators carries a holder 9 with a corresponding circular row of contact fingers 10 constituting together the fixed main contact, with which the movable main contact 7 can be brought into contact to close, or from which the main contact 7. can be removed to interrupt the circuit.
  • the contact holder 8 is connected through a conductor 8a with another part of the external circuit.
  • the movable main contact 7 is pneumatically driven and to that end coupled by apiston rod 11 with a piston 13 mounted for reciprocation in a cylinder 12.
  • the spaces 14,15, 16 inside the insulators 2,3,4 are filled with extinguishing gas, e.g. sulfurhexaflouride (SF )having an overpressure of say 14 atmospheres and the space l7outside the insulators 2,3,4 but inside the metal casing is filled withthe same gas having an overpressure of say 3.5 atmospheres.
  • extinguishing gas e.g. sulfurhexaflouride (SF ) having an overpressure of say 14 atmospheres
  • the space l7outside the insulators 2,3,4 but inside the metal casing is filled withthe same gas having an overpressure of say 3.5 atmospheres.
  • the cylinder 12 For the pneumatical driving of the movable main contact 7 by means of the piston 13.
  • the cylinder 12 is provided on its cylindrical wall with ports 18,19. Connected to these ports are slidevalves, of each of which the housing 20,21 extends in a gastight manner through the insulator 2.
  • a slide valve 26 Provided in the housing 20 is a slide valve 26 adapted to be moved to the right by a piston 24 mounted-for reciprocation in a cylinder 23 andto the left by a spring 25.
  • the housing 21 is provided with a piston28 mounted for reciprocation in a cylinder 27, a spring 29and a slide valve 30.
  • the slide valve 26 controls ports 31 for the connection of the high-pressure space 14 with the port 18 and it controls also-ports 32 for the connection of the low-pressure space 17 with said port 18.
  • theslide valve 30 is used to control the ports 33, 34 to establish the communication between the port 19 and the high-pressure space 14 and' the low-pressure space 17, respectively.
  • the slide valve 26 is moved to the right by the piston24-and'the ports 31 are opened and the ports 32 are closed. The extinguishing. gas then flows into the cylinder space above the'piston 13'and it drives said piston downwards, whereby the main contact 7 is brought into contact with the main contact 10 and the circuit-breaker is switched in. After the circuit-breaker has beenswitched in, the slide valve 26is returned to the shown left-hand end position. In order to keep the circuitebreaker in the switched-in position the piston 13 is coupled by a rod 36 to compression springs 37 which hold the main contact 7 and the piston 13 in position in each one of the two end positions. For the switching-off operation compressed are again moved upwards and the circuit-breaker is switched off.
  • the end positions of the movableswitching contact 7 are defined by stop members 39, 40 of resilient material provided inthe cylinder 12 and use at the same time to damp the switching movements.
  • the holder 8, the holder 9 and the fixed main contact contain a cylinder space 41, in which a piston 42 is mounted for reciprocation. This piston is loaded by a spring 43.
  • the cylinder space 44 below the piston 42 is connected through a port 45 to a slide valve, of which the housing 46 extends in a gastight manner through the wall of the insulator 4.
  • a slide valve 49 coupled with said piston and a spring 50 are accommodated.
  • the slide valve controls ports 51 opening into the high-pressure space and ports 52 communicating with the low-pressure space 17.
  • a chamber, indicated by 54, is in permanent communication with the low-pressure space 17 through the conduits 55 extending in a gas tight manner through the insulator 4.
  • an arcing contact 56 is mounted centrally within the movable main contact 7.
  • This arcing contact is rigidly and electrically conductively connected with said main contact so that it is moved together with said main contract throughout the entire stroke thereof.
  • an arcing contact 57 which is formed as a nozzle-contact and operates as the bushing contact of a plug-contact-connection, of which the plug is formed by the arcing contact 56.
  • the nozzle-contact 57 extends in a gastight and axially movable manner through the contact holder 9 and the bottom of the cylinder 41 and it is coupled with the piston 42.
  • the lower end face 58 of the nozzle-contact 57 cooperates with a seat 59 mounted in the bottom of the chamber 52, so that a valve is formed.
  • the nozzle-contact 57 is adapted to be moved together with the movable switch part comprising the main contact 7 and the arcing contact 56 through a part of the switching-off stroke of said movable switch portion.
  • the main contact 7 and the arcing contact 56 are in their highest positions and the spring 43 forces the tubular arcing contact 57 with its end face 58 against the seat 59, so that the passage of the nozzle-contact 57 is closed and the highpressure switching chamber on one hand and the low-pressure chamber 52 and the low-pressure space 17 on the other hand are separated from one another.
  • the circuit-breaker is held in the switched-ohcondition by the compression springs 37, since then both spaces of the cylinder 12 are in open communication with the low-pressure space 17 through the ports 18, 32 and'19, 34 so that they contain the same gas pressure.
  • the cylinder 23 is brought into communication with the lowpressure space 17, so that the slide valve 26 is forced back by the spring 25 into the illustrated left hand end position and thereby the cylinder space above the piston 13 is connected through the ports 32 with the low-pressure space 17.
  • the circuit-breaker has to be switched off gas under high pressure is fed through the conduit 38 into the cylinder 27 and through the conduit 53 into the cylinder 47.
  • the slide valves 30 and 49 are then moved to the right, so that the space in the cylinder 12 below the piston 13 and the space 44 in the cylinder 41 below the piston 42 receive gas under high pressure.
  • the main contact 7, the arcing contact 56 and the arcing contact 57 are then simultaneously moved in the switching-off direction. This also results in that the valve 58, 59 is opened After a part of the switching-off stroke has been covered, the shoulder 60 of the arcing contact '57 engages the contact holder 9.
  • the circuit-breaker of which only the arcing contacts control the quenching of the switching arc, is also provided with a bridging resistance 61.
  • This resistance is connected between a metal contact holder 62 and a metal ring 63 which is electrically conductively connected with the holders 8 and 9 of the fixed main contact 10.
  • the contact holder 62 supports an intermediate contact in the shape of a circular row of contact blocks 64. This intermediate contact is placed at a short distance above the contact 10 in the space extending between the fixed main contact 10 and the switched-off main contact 7.
  • the stroke of the tubular arcing contact 57 is so chosen as to permit, during the switching-off operation, the arcing contacts 56, S7 of being separated from one another only after the movable main contact 7 has been separated from the intermediate contact 64.
  • the illustrated embodiment also shows that the provision of the bridging resistance 61 and the intermediate contact 64 requires very little additional space in the circuit-breaker. This makes it possible to construct the circuit-breaker in such a way that it can be used with or without the bridging resistance without leading to unpractical dimensions of the circuit-breaker, when the said resistance is omitted.
  • An isolator switch for high voltage electrical systems adapted to make and break normal currents, said switch comprising a switching chamber filled withpressurized extinguishing gas, a fixed main contact, a movable main contact cooperating with said fixed contact, means for driving the movable contact through a predetermined stroke from and towards said fixed contact, a first movable arcing contact secured to and electrically conductively connected with said movable main contact, a tubular second movable arcing contact cooperating with said first arcing contact and electrically conductively connected with said fixed main contact, means for driving said second arcing contact through a predetermined stroke in directions toward and from said first arcing contact, the stroke of the second arcing contact being smaller than the stroke of the movable main contact and the first arcing contact, a fixed intermediate contact also cooperating with said movable main contact and situated in the space between the main contacts when the isolator switch is in its open condition, a bridging resistance connected between said intermediate contact and said fixed main contact, said
  • An isolator switch for high voltage electrical systems comprising, in combination;
  • a switch body defining a switching chamber filled with pressurized extinguishing gas
  • first and second arcing contacts electrically conductively connected respectively to said first and second main contacts
  • a bridging resistance contact spaced from aid second main contact such that said first main contact is spaced therefrom in said opened position'thereof but electrically engages same while out of contact with said second main contact during movement of said firstmain contact both to its opened condition and to its closed position;
  • bridging resistance means electrically. connecting said bridging resistance contact to said second main contact
  • first actuating means for maintaining said arcing contacts in contact with each other during opening movement of said first main contact until said first main contact has cleared said bridging resistance contact whereby the electrical circuit between said first and said second main contacts is maintained by said arcing contacts until said first main contact has cleared said bridging resistance contact;
  • second actuating means for moving one of said arcing contacts to separate said arcing contacts after said first main contact has cleared said bridging resistance contact during opening movement of said first main contactsaid one arcing contact being of tubular form defining a discharge passage adapted to convey extinguishing gas to the region of an are drawn between said arching contacts;
  • valve means opened and closed respectively by operation of said first and second actuating means to control flow of extinguishing gas through said discharge passage whereby said flow of extinguishing gas occurs only incidental to opening movement of said isolator switch;
  • said second actuator means being effective relatively position said arcing contacts when the isolator switch is opened so that said first main contact engages said bridging contact before said arcing contacts engage during subsequent closing movement of said first main contact.
  • valve means is formed by one end of said second arcing contact and a fixed portion of said isolator switch which are in contact when said second arcing contact is in its rest position.

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  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US753612A 1967-08-23 1968-08-19 Isolator switch with bridging resistance and extinguishing gas control Expired - Lifetime US3567885A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6711576A NL6711576A (enrdf_load_stackoverflow) 1967-08-23 1967-08-23

Publications (1)

Publication Number Publication Date
US3567885A true US3567885A (en) 1971-03-02

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ID=19801011

Family Applications (1)

Application Number Title Priority Date Filing Date
US753612A Expired - Lifetime US3567885A (en) 1967-08-23 1968-08-19 Isolator switch with bridging resistance and extinguishing gas control

Country Status (4)

Country Link
US (1) US3567885A (enrdf_load_stackoverflow)
DE (1) DE1665264A1 (enrdf_load_stackoverflow)
FR (1) FR1577693A (enrdf_load_stackoverflow)
NL (2) NL6711576A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876846A (en) * 1972-08-16 1975-04-08 Ite Imperial Corp Combination ground and test switch apparatus for pressurized-gas-insulated high voltage systems
US3987260A (en) * 1974-12-05 1976-10-19 I-T-E Imperial Corporation Ground and test connection for SF6 insulated bus
US5742017A (en) * 1995-08-18 1998-04-21 Gec Alsthom T & D Sa Circuit-breaker provided with a closure resistance having an insertion assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2450501A1 (fr) * 1979-03-02 1980-09-26 Alsthom Cgee Dispositif d'insertion de resistance a la fermeture d'un appareil d'interruption
IT8420810V0 (it) * 1984-02-10 1984-02-10 Sace Spa Sistema di contatti d'arco per interruttori elettrici, particolarmente a fluido d'estinzione dell'arco.
FR2665020B1 (fr) * 1990-07-18 1996-07-19 Alsthom Gec Disjoncteur pour la coupure des courants eleves.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3876846A (en) * 1972-08-16 1975-04-08 Ite Imperial Corp Combination ground and test switch apparatus for pressurized-gas-insulated high voltage systems
US3987260A (en) * 1974-12-05 1976-10-19 I-T-E Imperial Corporation Ground and test connection for SF6 insulated bus
US5742017A (en) * 1995-08-18 1998-04-21 Gec Alsthom T & D Sa Circuit-breaker provided with a closure resistance having an insertion assembly

Also Published As

Publication number Publication date
DE1665264A1 (de) 1971-01-21
FR1577693A (enrdf_load_stackoverflow) 1969-08-08
NL135709C (enrdf_load_stackoverflow)
NL6711576A (enrdf_load_stackoverflow) 1969-02-25

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