EP0720775A1 - Interrupteur a gaz comprime - Google Patents

Interrupteur a gaz comprime

Info

Publication number
EP0720775A1
EP0720775A1 EP94924695A EP94924695A EP0720775A1 EP 0720775 A1 EP0720775 A1 EP 0720775A1 EP 94924695 A EP94924695 A EP 94924695A EP 94924695 A EP94924695 A EP 94924695A EP 0720775 A1 EP0720775 A1 EP 0720775A1
Authority
EP
European Patent Office
Prior art keywords
switch
arc
gas
switching
nozzle
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.)
Ceased
Application number
EP94924695A
Other languages
German (de)
English (en)
Inventor
Hold Dienemann
Ulrich Habedank
Klaus-Peter Rolff
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP0720775A1 publication Critical patent/EP0720775A1/fr
Ceased legal-status Critical Current

Links

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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7076—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by the use of special materials
    • 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
    • H01H33/7053—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 having a bridging element around two hollow tubular 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
    • H01H33/7015—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts
    • H01H33/7069—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid characterised by flow directing elements associated with contacts characterised by special dielectric or insulating properties or by special electric or magnetic field control properties

Definitions

  • the invention relates to a compressed gas switch with two fixed, spaced-apart switching elements, which are hollow for the removal of switching gases and have nozzle bodies protruding into the distance on the end face from a substance which releases an extinguishing gas component under the influence of an arc, with one these switching pieces bridging in the switch-on position and releasing in the switch-off position to form a separating distance movable switching piece and with an arc pulling the arc contact system when switching off.
  • the nozzle body of a gas pressure switch made of electrically conductive material, such as e.g. made of graphite.
  • electrically conductive material such as e.g. made of graphite.
  • CF4 gas forms in SFg switches which has good extinguishing properties.
  • DE-PS 27 59 265 it is known for example from DE-PS 27 59 265 to manufacture the nozzle body from an insulating material.
  • an additional quenching gas component is formed under the influence of an arc if the insulating material contains a quenching gas-releasing substance.
  • the insulating material nozzles only have a slight influence on the electrical field in the separating section, which is formed by the electrically conductive versions of the nozzles.
  • the object of the invention is to specify a compressed gas switch of the type mentioned at the outset, in which the advantages of the electrically conductive nozzle body are combined with those of the electrically insulating nozzle body.
  • this object is achieved in that the nozzle bodies consist of a weakly conductive plastic and in that the bridging contact is equipped with an arc electrode which forms the arcing contact system with a second arc electrode on the fixed drain contact.
  • the electrical field in the isolating section is determined by the nozzle body when the switch is open, because they consist of a weakly conductive plastic and act as field electrodes.
  • the weakly conductive plastic of the nozzle body is not suitable for taking over the arc base points of the drawn arc, so that the nozzle body cannot form a commutation aid for the arc which is lengthened as a result of the blowing in the course of the switching-off process. After the arc has entered the interior of the hollow switching elements, it cannot start again on the nozzle contour in the further course of the switch-off action, so that reliable extinguishing is brought about.
  • the weakly conductive plastic has a specific electrical resistance of approximately 2 ⁇ 10 3 ⁇ cm.
  • the nozzle bodies consist of a polytetrafluoroethylene mixed with graphite.
  • the second arc electrode can be of hollow cylindrical design and can encompass the nozzle body of the discharge switching element as far as the area of the front nozzle opening.
  • the second arc electrode can consist of graphite.
  • the figure shows schematically a half-section of a pressure gas switch with the parts necessary for understanding the invention, the switch-on position being drawn above the center line and the extinguishing position reached shortly before the switch-off position of the pressure gas switch is shown below the center line 1.
  • the gas pressure switch which contains SFg as the extinguishing and insulating agent, has two fixed ones.
  • Switch pieces 2, 3 which are arranged at a distance A from one another and are hollow for the removal of switching gases. Both contact pieces 2, 3 have, on the end face, nozzle bodies 4, 5 which protrude into the separating distance formed by the distance A and which, under the action of an arc, contain a substance which releases an extinguishing gas component.
  • the gas pressure switch according to the invention has a movable switching piece 6 bridging the two switching pieces 2, 3 in the switch-on position, with a plurality of spring-loaded contact plates 7 distributed uniformly over the circumference.
  • the movable switching piece 6 outputs switch position the separation distance formed by the distance A free.
  • the gas pressure switch according to the invention is provided with an arcing contact system which draws an arc when it is switched off and which consists of an annular graphite electrode 8 on the discharge switching element 3 on the one hand and a burn-off ring 9 on the bridging switching element 6 on the other hand.
  • the nozzle body 4.5 consist of a weakly conductive plastic, which has a specific electrical resistance of about 2x10 3 ⁇ cm.
  • the nozzle bodies 4, 5 can be produced from a polytetrafluoroethylene mixed with graphite.
  • the second arc electrode 8 of the discharge switching element 3 is of hollow-cylindrical design, wherein it encompasses the nozzle body 5 up to the region of the end-side nozzle opening.
  • the second arc electrode 8, like the first arc electrode 9, can consist of graphite.
  • the bypass switch 6 When the compressed gas switch is routed from the switch-on position shown above the center line 1 into the extinguishing position shown below the center line 1, the bypass switch 6 is moved in the direction of the arrow 10 by a drive (not shown further), which at the same time also has a blowing cylinder 11 moved against a fixed blow piston 12.
  • the sulfur hexafluoride present in the space 13 is compressed until the bypass switching element 6 runs off the sequence switching element 3 and a blowing grille 14 made of plastic material is transferred into the separating section to control the extinguishing gas flow. If the arc electrode 9 from the
  • Arc electrode 8 runs, an arc is drawn, which is driven under the action of the extinguishing gas flow into the interior of the switching pieces 2,3 and in the further course of the switch-off action can not reignite at the exposed positions denoted by 15, the nozzle body 4.5 because the weakly conductive plastic used is not suitable for guiding an arc base.
  • the nozzle bodies 4, 5 delimiting the separating distance at distance A form electrodes, which make the field in the separating distance favorable, so that the compressed gas switch according to the invention can withstand loads with high lightning impulse voltages with certainty.

Landscapes

  • Circuit Breakers (AREA)

Abstract

L'invention concerne un interrupteur à gaz comprimé pourvu de deux pièces de contact (2, 3) fixes, montées à distance A l'une de l'autre et qui sont évidées de manière à évacuer des gaz de commutation. L'interrupteur comporte, à l'avant, des ajutages (4, 5) réalisés dans un matériau qui libère un constituant de gaz de coupage sous l'effet d'un arc électrique, qui font saillie dans l'espace (A). En position "MARCHE", les pièces de contact sont shuntées par une pièce de contact mobile qui libère l'espace intercontact en position "ARRET". Un système de contact d'arc électrique (8, 9) est également prévu qui tire l'arc lors de la mise hors circuit. Afin d'associer les avantages d'ajutages électroconducteurs à ceux des ajutages électro-isolants, les ajutages (4, 5) sont réalisés selon l'invention dans un plastique faiblement conducteur. La pièce de contact de shuntage (6) est pourvue d'une électrode d'arc électrique (9) qui constitue le système de contact d'arc électrique (8, 9), conjointement avec une seconde électrode d'arc électrique (8) sur la pièce de contact (3) fixe.
EP94924695A 1993-09-21 1994-08-22 Interrupteur a gaz comprime Ceased EP0720775A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19934332886 DE4332886A1 (de) 1993-09-21 1993-09-21 Druckgasschalter
DE4332886 1993-09-21
PCT/DE1994/000987 WO1995008836A1 (fr) 1993-09-21 1994-08-22 Interrupteur a gaz comprime

Publications (1)

Publication Number Publication Date
EP0720775A1 true EP0720775A1 (fr) 1996-07-10

Family

ID=6498763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94924695A Ceased EP0720775A1 (fr) 1993-09-21 1994-08-22 Interrupteur a gaz comprime

Country Status (3)

Country Link
EP (1) EP0720775A1 (fr)
DE (1) DE4332886A1 (fr)
WO (1) WO1995008836A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19519992C2 (de) * 1995-05-24 2002-03-21 Siemens Ag Schaltstrecke für einen mit einem Löschgas arbeitenden Hochspannungs-Leistungsschalter
DE19622753C1 (de) * 1996-06-07 1997-08-28 Daimler Benz Ag Düse für einen Druckgasschalter eines elektrischen Hochspannungsschalters

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2125788A1 (de) * 1970-12-14 1972-06-29 Transform Roentgen Matern Veb Steuerelektrode bzw. Abschirmung für eine Hochspannungsanlage
DE2502743B2 (de) * 1975-01-21 1979-01-04 Siemens Ag, 1000 Berlin Und 8000 Muenchen Kontaktsystem für Druckgasschalter
CH596641A5 (fr) * 1976-04-02 1978-03-15 Sprecher & Schuh Ag
DE2759265C3 (de) * 1977-12-30 1980-09-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Druckgasschalter
DE4129572C1 (en) * 1991-09-06 1992-12-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De Insulating compsn. for a nozzle in high tension switch - consisting of thermoplastic polymer e.g. polyether:imide and conductive polymer e.g. poly:pyrrole salt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9508836A1 *

Also Published As

Publication number Publication date
WO1995008836A1 (fr) 1995-03-30
DE4332886A1 (de) 1995-03-23

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Legal Events

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Inventor name: ROLFF, KLAUS-PETER

Inventor name: HABEDANK, ULRICH

Inventor name: DIENEMANN, HOLD

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