EP0173804B1 - Interrupteur à gaz comprimé - Google Patents

Interrupteur à gaz comprimé Download PDF

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Publication number
EP0173804B1
EP0173804B1 EP85107283A EP85107283A EP0173804B1 EP 0173804 B1 EP0173804 B1 EP 0173804B1 EP 85107283 A EP85107283 A EP 85107283A EP 85107283 A EP85107283 A EP 85107283A EP 0173804 B1 EP0173804 B1 EP 0173804B1
Authority
EP
European Patent Office
Prior art keywords
housing
compressed
contact
case
breaker according
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
Application number
EP85107283A
Other languages
German (de)
English (en)
Other versions
EP0173804A1 (fr
Inventor
Jürg Ischi
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 Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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 AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0173804A1 publication Critical patent/EP0173804A1/fr
Application granted granted Critical
Publication of EP0173804B1 publication Critical patent/EP0173804B1/fr
Expired legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02Details
    • H01H33/025Terminal arrangements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/70Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/98Switches 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
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • the invention is based on a gas pressure switch according to the preamble of claim 1.
  • the invention relates to a gas pressure switch as described in DE-A-2 811 509.
  • the known switch has an insulating gas-filled, tubular housing in which two contact pieces which are movable relative to one another along the housing axis are arranged.
  • the contact pieces form a U-shaped current loop with two current connections running through the housing wall at right angles to the housing axis.
  • This switch uses an insulating gas to extinguish an arc that is located on the contact pieces when it is switched off, and which is compressed by the arc as a result of heating and is stored in a heating volume surrounding the contact pieces.
  • this switch requires an insulating tube, the inside diameter of which is matched to the outside diameter of one of its movable contact pieces.
  • Such an insulating tube stabilizes the arc on the housing axis which is burning in the course of the U-shaped current loop and is therefore exposed to radial magnetic forces, but is exposed to the direct thermal influence of the arc and is therefore subject to heavy wear.
  • the power connections are offset from one another in the direction of the housing axis, which results in a comparatively large axial overall length.
  • This switch also has a comparatively large overall length, since the two power connections are axially offset from one another below the isolating gap delimiting the switching arc on the housing and the current from the upper of the two electrical connections is first in a casing part of the housing coaxially surrounding the isolating distance and then via a radially extending plate is guided to a nozzle-shaped, fixed contact piece.
  • the current path formed by the jacket part, the plate and the contact pieces receiving the arc in the isolating section consists of axially symmetrical loops which center the arc on the housing axis and prevent its radial migration.
  • the compressed gas switch according to the invention is characterized in that, because of its small overall length in the direction of the contact piece axis, it can be installed in switchgear in such a way that the path of the current to be switched off runs transversely to the contact piece axis. This makes it possible to design the switchgear to be particularly space-saving. In addition, such a switch can be easily installed, since its contact system can be produced independently of its housing and can be attached to a fixed contact located in the housing by simply plugging it on.
  • 1 denotes a cylindrical housing filled with an insulating gas, such as sulfur hexafluoride, for example at a pressure of 4 bar.
  • Bushings 2 and 3 are provided on diametrically opposite sides of the housing 1, through which a power connection 4 and 5 for a movable, fully cylindrical contact piece 6 and a fixedly hollow cylindrical contact piece 7 are guided into the interior of the housing 1.
  • the power connection 2 is electrically conductively connected via a sliding contact (not shown) and, for example, designed as a multi-lamella contact, to the contact piece 6 movable by a drive (not shown) in the direction of an axis shown in broken lines.
  • the movable contact piece 6, like the fixed contact piece 7, is designed to be erosion-resistant. Both contact pieces can be used Transfer of nominal current may be formed, however, when transmitting large nominal currents, it is advantageous to provide the movable contact piece 6 with a nominal current contact 8 shown in dotted lines in FIG dotted) nominal current contact 9 cooperates.
  • This forms a nominal current path which now runs parallel to the contact pieces 6 and 7, which now only act as erosion contacts, and which runs outside a heating volume 10, which consists of a body 11 arranged coaxially with the contact pieces 6 and 7 and made of a pressure-resistant and erosion-resistant insulating material, such as glass-fiber reinforced material Plastic that is surrounded.
  • the contact piece 7 does not necessarily have to be hollow cylindrical. Rather, it is also possible for it to be of fully cylindrical design and to close the heating volume 10. In a corresponding manner, the movable contact piece 6 can be designed as a hollow cylinder.
  • the insulating body 11 has a lower opening, into which the movable contact piece 6 is guided, and an upper opening, in which the fixed contact 7 is fastened to the insulating body 11.
  • the fixed contact 7 contains two contact parts 12 and 13 (FIG. 2) designed as erosion-resistant nozzle half-shells, which are in electrically conductive connection with the power connection 5. This electrically conductive connection can be brought about in that the current connection 5 is led directly to the contact piece 7 or acts only indirectly on the contact piece 7.
  • the power connection 5 is formed from two flat rails 14 and 15 which run parallel to one another and which have fork-like widened ends in the region of the contact piece 7.
  • the ends of the two flat rails 14 and 15 rest on insulating parts 16 and 17, which are supported on diametrically opposite outer surfaces of both contact parts 12 and 13 (see also FIG. 3).
  • the ends of the turns 18, 19 facing away from the flat rails 14, 15 are connected in an electrically conductive manner to a spring ring 21 which is arranged coaxially with the coil 20 and which presses the contact parts 12, 13 together.
  • the spring ring 21 is made of electrically conductive material and therefore mediates the electrical contact between the coil 20 and the contact parts 12 and 13.
  • the two flat rails 14, 15 are under the action of a spring 22.
  • the flat rails 14, 15 are supported on the one hand in a defined manner on the contact parts 12, 13 and, on the other hand, there is a defined contact force between the flat rails 14, 15 and a fixed contact provided in the power connection 23 generated.
  • the contact system described above can be completely preassembled and then only needs to be plugged onto the fixed contact 23 when mounting the compressed gas switch.
  • the power connections 4 and 5 are guided out of the housing 1 essentially transversely to the contact piece axis and each form at least one loop in the interior of the housing.
  • These loops are arranged in a plane containing the bushings 2 and 3 and the contact piece axis and each have a section 24 or 25 which extends in the axial direction and a section 26 or 27 which extends radially to the contact piece axis.
  • the section 24 extends from the bushing 2 downwards, whereas the section 25 extends from the bushing 3 upwards.
  • the section 26 adjoining the section 24 extends into the interior of the housing 1 and ends in the sliding contact enclosing the movable contact piece 6, while the section 27 adjoining the section 25 and also extends into the housing 1 is designed as flat rails 14, 15 as described above and ends at contact piece 7.
  • This gas pressure switch has the mode of operation described below:
  • the movable contact piece 6 When it is switched off, the movable contact piece 6 is moved downward and, after the nominal current contacts 8 and 9, which may be provided, are opened, an arc 28 caused by the current to be switched off is drawn between the subsequently separating contact pieces 6 and 7. Due to the loops provided in the current connections 4 and 5 and designed as described above, the electromagnetic forces acting on the arc 28 cancel each other almost completely, so that the arc 20 burns essentially centrally despite the cross-feed, whereby the contact pieces 6 and 7 burn off evenly is achieved.
  • the configuration of the power connection 5 by means of parallel flat rails 14 and 15 ensures that the frictional forces between the fixed contact piece 7 and the movable contact piece inserted into the fixed contact piece 7 when switched on can be kept low.
  • the erosion on the contact pieces 6 and 7 is further reduced by the fact that the current to be switched off flows through the coil 20.
  • the magnetic field caused by the coil 20 namely causes the arc 28 to rotate about the contact piece axis. Since the coil 20 has two windings 18 and 19, each of which is fed in parallel by a flat rail 14 or 15, the attractive force of the flat rails 14 and 15 is also retained in the region of the fixed contact piece 7.
  • the spring ring 21 which receives the currents flowing through the parallel windings 18 and 19 of the coil 20 effects the current transfer to the contact parts 12 and 13.
  • the spring forces of this ring should be dimensioned in such a way that in the switched-on state, namely when the movable contact piece 6 is in the contact piece 7 is retracted, the force effect of which ensures sufficient current transfer from the fixed to the movable contact piece via the contact parts 12 and 13 for large and small currents. Since, as described above, the attractive and repulsive electromagnetic forces at the contact piece 7 are almost compensated for with large currents when the flat rails 14 and 15 are suitably dimensioned, it is possible to keep the frictional force between the fixed and movable contact piece and thus the contact abrasion low.
  • the arc 28 drawn between the contact pieces 6 and 7 heats the insulating gas vigorously in the high current phase, as a result of which the gas pressure in the heating volume 10 is increased considerably.
  • a vigorous flow of insulating gas stored in the heating volume 10 then sets in through the nozzle opening enclosed by the contact parts 12 and 13 into an expansion space delimited by insulating body 11 and housing 1, through which the arc 28 is blown.
  • a further advantageous effect of the invention is to be seen in the fact that the heated insulating gas entering the expansion space initially strikes the housing 1 on the side facing away from the drive, and during this and during its subsequent outflow along the wall of the housing into the nominal current contacts 8, if applicable , 9 containing part of the housing is cooled considerably.
  • the nominal current contacts 8, 9, if provided, are then effectively protected against direct contamination by the extinguishing gases emerging from the heating volume 10 and heated to high temperatures, despite the short overall length of the housing in the axial direction.
  • An additional magnetic blowing is achieved here by the coil 20, in particular if it is arranged in the region of the narrowest part of the opening of the contact piece 7.
  • a further blowing can also be achieved in that the lower opening in the insulating material body 11 is designed as a nozzle that can be released by the movable contact piece 6 or when the movable contact piece 6 itself is designed as a nozzle.

Landscapes

  • Circuit Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Claims (8)

1. Interrupteur à gaz comprimé avec un boîtier (1) rempli de gaz isolant, deux éléments de contact (6, 7) cylindriques mobiles l'un par rapport à l'autre le long d'un axe dans le boîtier (1), deux barres de raccordement (4, 5) électriquement reliées aux éléments de contact (6, 7) et sortant du boîtier (1) dans une direction sensiblement transversale par rapport à l'axe des éléments de contact, un volume de chauffage (10) entouré par un corps en matériau isolant (11), dans lequel sont menées, au moins en position d'enclenchement, les extrémités libres des éléments de contact (6, 7) éloignées des barres de raccordement (4, 5) et au moins une ouverture en forme de tuyère reliant le volume de chauffage (10) à une chambre d'expansion, caractérisé en ce que les barres de raccordement (4, 5) sortent du boîtier (1) par des côtés diamétralement opposés l'un à l'autre et forment chacune à l'intérieur du boîtier au moins un coude, lesquels coudes sont disposés dans un plan commun et sont agencés de telle façon qu'ils soient parcourus en sens opposés par le courant à couper.
2. Interrupteur à gaz comprimé suivant la revendication 1, caractérisé en ce que chaque coude présente un premier tronçon (24, 25) orienté en direction axiale et un second tronçon (26, 27) orienté en direction radiale par rapport à l'axe des éléments de contact, et en ce que les premiers tronçons (24, 25) sont placés en sens contraire à partir des passages (2, 3) et se raccordent chacun respectivement aux seconds tronçons (26, 27) par leurs extrémités éloignées des passages (2, 3).
3. Interrupteur à gaz comprimé suivant la revendication 2, caractérisé en ce que la barre de raccordement (5) électriquement reliée à celui des deux éléments de contact (6, 7) qui est fixe est constituée dans son second tronçon (27) d'au moins deux rails plats (14,15) disposés parallèlement l'un à l'autre, qui sont appuyés sur des faces extérieures opposées l'une à l'autre de l'élément de contact fixe (7).
4. Interrupteur à gaz comprimé suivant la revendication 3, caractérisé en ce que l'élément de contact fixe (7) est fixé dans une ouverture du corps en matériau isolant (11) entourant le volume de chauffage (10) et en ce que les rails plats (14,15) sont isolés électriquement par rapport à cet élément de contact (7) et présentent chacun un raccordement à une d'au moins deux spires (18, 19) d'une bobine (20) entourant l'élément de contact fixe (7) et reliée électriquement à celui-ci.
5. Interrupteur à gaz comprimé suivant la revendication 4, caractérisé en ce que l'élément de contact fixe (7) présente deux pièces de contact (12,13) profilées en demi-coquilles de tuyère et posées dans l'ouverture du corps en matériau isolant (11), lesquelles reposent en contact électrique sur une bague élastique (21) qui est électriquement reliée aux spires (18,19) de la bobine (20).
6. Interrupteur à gaz comprimé suivant la revendication 5, caractérisé en ce que les éléments de contact (6, 7) sont chacun électriquement reliés a des contacts à courant nominal (8, 9), qui sont placés du côté du boîtier (1) qui est éloigné de l'ouverture de sortie des demi-coquilles de tuyère.
7. Interrupteur à gaz comprimé suivant une des revendications 3 à 6, caractérisé en ce que les rails plats (14,15) sont soumis à l'action d'un ressort (22).
8. Interrupteur à gaz comprimé suivant la revendication 7, caractérisé en ce que les rails plats (14, 15) sont enfichables sur un contact fixe (23).
EP85107283A 1984-08-22 1985-06-13 Interrupteur à gaz comprimé Expired EP0173804B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH401584 1984-08-22
CH4015/84 1984-08-22

Publications (2)

Publication Number Publication Date
EP0173804A1 EP0173804A1 (fr) 1986-03-12
EP0173804B1 true EP0173804B1 (fr) 1988-09-21

Family

ID=4268211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85107283A Expired EP0173804B1 (fr) 1984-08-22 1985-06-13 Interrupteur à gaz comprimé

Country Status (4)

Country Link
US (1) US4665288A (fr)
EP (1) EP0173804B1 (fr)
JP (1) JPH07101581B2 (fr)
DE (2) DE3435967A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2617633B1 (fr) * 1987-07-02 1989-11-17 Merlin Gerin Disjoncteur a arc tournant et a expansion
US5140107A (en) * 1991-07-02 1992-08-18 Ncr Corporation Digitizer screen and method of making
US5464956A (en) * 1994-04-08 1995-11-07 S&C Electric Company Rotating arc interrupter for loadbreak switch
DE19613568A1 (de) * 1996-04-04 1997-10-09 Asea Brown Boveri Leistungsschalter

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB485463A (en) * 1936-10-31 1938-05-20 British Electrical & Allied In Improvements in or relating to electrical circuit breakers
DE1864376U (de) * 1962-08-10 1962-12-27 Calor Emag Elektrizitaets Ag Hochspannungsschaltgeraet mit handbetaetigten schaltbruecken.
FR1366760A (fr) * 1963-12-06 1964-07-17 Coq France Chambre de coupure pour interrupteur à coupure en charge
US3632932A (en) * 1969-08-08 1972-01-04 Gen Electric Current-limiting circuit breaker having a field strap assembly
NL7306760A (fr) * 1973-05-15 1974-11-19
DE2339652A1 (de) * 1973-08-04 1975-02-20 Bbc Brown Boveri & Cie Loeschkammer fuer mittel- und hochspannungsschaltgeraete
DE2342520A1 (de) * 1973-08-23 1975-03-06 Calor Emag Elektrizitaets Ag Hochspannungsleistungsschalter
JPS50156675A (fr) * 1974-05-31 1975-12-18
JPS53117767A (en) * 1977-03-24 1978-10-14 Mitsubishi Electric Corp Switch
DE2759267C3 (de) * 1977-12-30 1980-09-11 Siemens Ag, 1000 Berlin Und 8000 Muenchen Druckgasschalter
FR2459543A1 (fr) * 1979-06-15 1981-01-09 Alsthom Cgee Disjoncteur a haute tension a arc tournant et autosoufflage

Also Published As

Publication number Publication date
DE3565190D1 (en) 1988-10-27
US4665288A (en) 1987-05-12
EP0173804A1 (fr) 1986-03-12
DE3435967A1 (de) 1986-03-06
JPH07101581B2 (ja) 1995-11-01
JPS6161322A (ja) 1986-03-29

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