EP0236641B1 - Isolator for a metal-clad high tension installation - Google Patents

Isolator for a metal-clad high tension installation Download PDF

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Publication number
EP0236641B1
EP0236641B1 EP86402681A EP86402681A EP0236641B1 EP 0236641 B1 EP0236641 B1 EP 0236641B1 EP 86402681 A EP86402681 A EP 86402681A EP 86402681 A EP86402681 A EP 86402681A EP 0236641 B1 EP0236641 B1 EP 0236641B1
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EP
European Patent Office
Prior art keywords
isolating switch
electrode
contact
enclosure
switch 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 - Lifetime
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EP86402681A
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German (de)
French (fr)
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EP0236641A1 (en
Inventor
Jean Kieffer
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Merlin Gerin SA
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Merlin Gerin SA
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Publication date
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Priority to AT86402681T priority Critical patent/ATE73575T1/en
Publication of EP0236641A1 publication Critical patent/EP0236641A1/en
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Publication of EP0236641B1 publication Critical patent/EP0236641B1/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
    • H01H33/02—Details
    • H01H33/24—Means for preventing discharge to non-current-carrying parts, e.g. using corona ring

Definitions

  • a disconnector of the type mentioned makes it possible to isolate part of the installation or a departure, in particular from an armored station, the operation of the disconnector being carried out without load.
  • Such a disconnector may have to cut capacitive or inductive currents of low power, but sufficient to draw an arc between the contacts of the disconnector.
  • Such an arc is quickly extinguished during the continued operation of the disconnector and does not lend itself to consequence when it remains confined in the contact separation zone. It has been noted that in a shielded installation with a grounded metal casing, the arc drawn between the contacts of the disconnector risks, under certain severe conditions, migrating towards the casing and causing an internal breakdown of the arc at the Earth.
  • an electric field distribution screen prevents field concentration in the vicinity of the end of the fixed arcing contact. The presence of this screen does not prevent migration from the arc to the envelope at ground potential.
  • a switch has two metal screens staggered coaxially along the cut-off interval.
  • One of the screens is electrically connected to the fixed contact, and prevents the arc from stagnating on the ends of the contacts.
  • the second screen is electrically insulated by an insulating piece allowing the arc length and the extinction time to be reduced. Since the second screen is isolated from the fixed contact, it is impossible for it to pick up an electric arc.
  • the present invention aims to allow the production of an isolation disconnector avoiding any priming towards the earthed enclosure, during an operation of the disconnector.
  • the disconnector according to the invention is characterized in that an auxiliary electrode of revolution is connected to the fixed contact, and is interposed between the isolation interval d and the metallic envelope by extending coaxially over the entire length of said interval , said electrode being arranged to sense an arc capable of migrating from said interval towards said envelope.
  • the revolution electrode is sufficiently far from the movable contact and parts at the potential of this contact, to maintain the insulation voltage.
  • the electrode of revolution is also at a sufficient distance from the grounded metal casing to avoid any breakdown between this electrode and the casing.
  • the metal casing advantageously has at the level of the electrode of revolution an enlarged section sufficient to ensure the dielectric strength of the installation.
  • the envelope may be spherical or of cylindrical shape of enlarged section, connected by frustoconical parts to the cylindrical sheaths of the installation.
  • the length of the electrode of revolution corresponds substantially to the length of separation of the contacts to avoid any path from the arc to the grounded enclosure.
  • the edges of the electrode of revolution are rounded to ensure a good distribution of the field and to limit the risks of priming.
  • the electrode is preferably in the form of a ring, for example a toroid of circular section, coaxially enveloping the contacts of the disconnector.
  • the ring of revolution is fixed to the fixed contact by arms ensuring at the same time the electrical connection, these arms tangentially connecting to the external part of the ring.
  • the arms can belong or be replaced by a full cap forming a real screen between the fixed contact and the annular electrode preventing any passage of the arc in this interval.
  • a sealed and earthed metal casing 10 is filled with a gas with high dielectric strength, in particular sulfur hexafluoride.
  • the envelope 10 has flanges 12, 14, for connection to cylindrical sheaths 16, 18, belonging to the envelope of an armored station.
  • the sheaths 16, 18 surround coaxially conductors or bars 20, 22, supported by insulators 24, interposed between the flanges 12, 14.
  • the bars 20, 22, are perpendicular, but it It is clear that the invention applies to bars aligned or extending in oblique directions.
  • the end 26 of the bar 20 inside the casing 10 carries a fixed contact 28 having contact clamps 30, arranged in the form of a tulip to coaxially surround a movable contact 32, in the form of a sliding pin.
  • the pin 32 is connected by a rod 34 to an operating mechanism 36 capable of displacing the pin 32 axially to come selectively into a closed position of engagement between the clamps 30 of fixed contact and opening of the disconnector at a distance " d "for separating the fixed contact 28.
  • the pin 32 is electrically connected by rubbing contacts 38 at the end of the bar 22 internal to the casing 10.
  • the fixed contact 28 and the movable contact 32 are each equipped with a cover 40, 42, of hemispherical shape ensuring good distribution of the field around these contacts.
  • the covers 40, 42 have an axial opening for the passage of the contact pin 32.
  • the fixed contact 28 can also have an arcing finger 44 disposed axially between the contact clamps 30 and extending to the edges of the cover 40.
  • the sliding pin 32 has, when the finger 44 exists, a combined internal recess 46 into which the finger 44 enters in the closed position of the disconnector.
  • Such a disconnector well known to specialists, makes it possible to establish or break the connection between the conductors 20, 22, by simple sliding, of the movable pin 32, actuated by the operating mechanism 36.
  • the metal casing 10 is in the form of a sphere with a section greater than that of the sheaths 16, 18, and the fixed contact assembly 28, movable contact 32, is disposed substantially in the center of this sphere.
  • An annular electrode 48 in the shape of a torus, is arranged in the diametrical plane of the sphere 10, perpendicular to the movable contact pin 32, coaxially surrounding the separation gap "d" of the fixed 28 and movable 32 contacts.
  • the electrode of revolution 48 is interposed between the metal casing 10 and the separation interval "d" which constitutes the zone of formation of an arc, during a cut of capacitive or inductive current.
  • the diameter of the torus 48 is substantially equivalent to the distance "d" of insulation between the fixed contacts 28 and movable 32 in a separate position.
  • the annular electrode 48 is fixed by arms or a cap 50 to the fixed contact 28. These arms are tangentially connected to the outer edges 52 of the torus to have a rounded shape avoiding any concentration of the electric field. Opposite ends of the arms 50 are fixed at the rear of the fixed contact 28 sheltered from the distributor cover 40. The arms 50 provide the mechanical support and the electrical connection of the annular electrode 48 to the fixed contact 28.
  • the separation distance from the annular electrode 48 to the movable contact 32 and to the distributor cover 42 is always greater than or equal to the isolation distance "d" separating the fixed contacts 28 and movable 32 in open position, so as to ensure sufficient dielectric strength.
  • the annular electrode 48 is sufficiently distant from the grounded metal casing 10, to avoid any breakdown between this electrode and the casing 10.
  • the metal casing 10 may be in the form of an ellipsoid or of a cylinder associated with frustoconical connection parts or of any other form.
  • the section of the electrode of revolution 48 can be flattened to constitute an oval or a simple cylinder if care is taken to provide the edges with a swollen portion to avoid any point capable of ensuring a concentration of the field lines. Referring to the figure, it can be seen that the internal part of the electrode of revolution 48, disposed opposite the fixed contact 28, is of little use and that it can be removed, the electrode 48 being summed up in this case to a rounded part formed by a folding of the edge of the cap 50. The specialist can easily imagine other operating forms of such an electrode of revolution 48.
  • the arrangement according to invention requires a larger volume, but this increase is largely offset by the security provided by the electrode 48 which constitutes an almost impassable barrier to the arc. In the case of an envelope of sufficient diameter, it is obviously unnecessary to increase the section of the envelope in line with the ring of revolution 48.
  • the fixing and the electrical connection of the electrode of revolution 48 can be carried out in a different manner and independently of each other, the invention of course extending to any variant remaining within the framework of equivalences.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Contacts (AREA)
  • Gas-Insulated Switchgears (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Insulators (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Abstract

An isolating switch of a metalclad installation having an earthed metal enclosure is filled with a high dielectric strength gas. The isolation gap "d" separating the stationary contact from the movable sliding pin is surrounded by an annular electrode fitted between this isolation gap "d" and the enclosure. The annular electrode extends over the whole length of the isolation gap "d" and is electrically connected to the stationary contact to prevent any migration of the arc drawn between the contacts towards the earthed enclosure. The metal enclosure is advantageously spherical in shape, the contacts being disposed appreciably in the center of the sphere.

Description

L'invention est relative à un sectionneur d'une installation blindée à enveloppe métallique de révolution, mise à la terre, remplie d'un gaz à rigidité diélectrique élevée, comprenant :

  • un contact mobile en forme de broche coulissante, susceptible de venir en une position de fermeture d'engagement avec un contact fixe aligné, et en une position d'ouverture de séparation dudit contact fixe par un intervalle d'isolement "d",
  • un écran répartiteur de champ en forme de capot fixe coiffant l'extrémité du contact fixe auquel il est électriquement connecté et présentant une ouverture centrale de passage de la broche du contact mobile en position fermée du sectionneur,
  • un écran répartiteur de champ en forme de capot associé au contact mobile et agencé pour coiffer l'extrémité du contact mobile en position ouvert en étant connecté électriquement au contact mobile.
The invention relates to a disconnector of an armored installation with a metallic shell of revolution, grounded, filled with a gas of high dielectric strength, comprising:
  • a movable contact in the form of a sliding pin, capable of coming into a closed engagement position with an aligned fixed contact, and into an open position for separating said fixed contact by an isolation interval "d",
  • a field distributor screen in the form of a fixed hood covering the end of the fixed contact to which it is electrically connected and having a central opening for passage of the pin of the movable contact in the closed position of the disconnector,
  • a hood-shaped field distributor screen associated with the movable contact and arranged to cover the end of the movable contact in the open position while being electrically connected to the movable contact.

Un sectionneur du genre mentionné permet d'isoler une partie de l'installation ou un départ, notamment d'un poste blindé, la manoeuvre du sectionneur étant réalisée hors charge. Un tel sectionneur peut être amené à couper des courants capacitifs ou inductifs de faible puissance, mais suffisant pour tirer un arc entre les contacts du sectionneur. Un tel arc est rapidement éteint lors de la manoeuvre poursuivie du sectionneur et ne prête pas à conséquence lorsqu'il reste confiné dans la zone de séparation des contacts. Il a été constaté que dans une installation blindée a enveloppe métallique mise à la terre, l'arc tiré entre les contacts du sectionneur risque dans certaines conditions sévères de migrer vers l'enveloppe et d'engendrer un claquage interne de l'arc à la terre. Pour éviter ces inconvénients, il a déjà été proposé de limiter la durée de l'arc par une vitesse accélérée des contacts ou de maintenir l'arc dans la partie centrale par des écrans de répartition de champ tel que décrit dans le document EP-A-40.781. Ces solutions donnent satisfaction pour certaines c onditions de fonctionnement, mais elles n'assurent pas une fiabilité absolue.A disconnector of the type mentioned makes it possible to isolate part of the installation or a departure, in particular from an armored station, the operation of the disconnector being carried out without load. Such a disconnector may have to cut capacitive or inductive currents of low power, but sufficient to draw an arc between the contacts of the disconnector. Such an arc is quickly extinguished during the continued operation of the disconnector and does not lend itself to consequence when it remains confined in the contact separation zone. It has been noted that in a shielded installation with a grounded metal casing, the arc drawn between the contacts of the disconnector risks, under certain severe conditions, migrating towards the casing and causing an internal breakdown of the arc at the Earth. To avoid these drawbacks, it has already been proposed to limit the duration of the arc by an accelerated speed of the contacts or to maintain the arc in the central part by field distribution screens as described in document EP-A -40.781. These solutions are satisfactory for certain conditions of operation, but they do not ensure absolute reliability.

Selon le document US-A-4.236.053 relatif à un disjoncteur à autosoufflage, un écran de répartition du champ électrique évite une concentration du champ au voisinage de l'extrémité du contact d'arc fixe. La présence de cet écran ne permet pas d'éviter une migration de l'arc vers l'enveloppe se trouvant au potentiel de la terre.According to document US-A-4 236.053 relating to a self-blowing circuit breaker, an electric field distribution screen prevents field concentration in the vicinity of the end of the fixed arcing contact. The presence of this screen does not prevent migration from the arc to the envelope at ground potential.

Selon le document DE-C-744.144, un interrupteur possède deux écrans métalliques échelonnés coaxialement le long de l'intervalle de coupure. L'un des écrans est connecté électriquement au contact fixe, et empêche la stagnation de l'arc sur les extrémités des contacts. Le deuxième écran est isolé électriquement par une pièce isolante permettant de diminuer la longueur de l'arc et le temps d'extinction. Etant donné que le deuxième écran est isolé par rapport au contact fixe, il lui est impossible de capter un arc électrique.According to document DE-C-744.144, a switch has two metal screens staggered coaxially along the cut-off interval. One of the screens is electrically connected to the fixed contact, and prevents the arc from stagnating on the ends of the contacts. The second screen is electrically insulated by an insulating piece allowing the arc length and the extinction time to be reduced. Since the second screen is isolated from the fixed contact, it is impossible for it to pick up an electric arc.

La présente invention a pour but de permettre la réalisation d'un sectionneur d'isolement évitant tout amorçage vers l'enveloppe mise à la terre, lors d'une manoeuvre du sectionneur.The present invention aims to allow the production of an isolation disconnector avoiding any priming towards the earthed enclosure, during an operation of the disconnector.

Le sectionneur selon l'invention est caractérisé en ce qu'une électrode auxiliaire de révolution est reliée au contact fixe, et est intercalée entre l'intervalle d'isolement d et l'enveloppe métallique en s'étendant coaxialement sur toute la longueur dudit intervalle, ladite électrode étant agencée pour capter un arc susceptible de migrer dudit intervalle vers ladite enveloppe.The disconnector according to the invention is characterized in that an auxiliary electrode of revolution is connected to the fixed contact, and is interposed between the isolation interval d and the metallic envelope by extending coaxially over the entire length of said interval , said electrode being arranged to sense an arc capable of migrating from said interval towards said envelope.

En entourant la zone d'arc d'une électrode reliée au contact fixe, on empêche ni la formation de l'arc, ni sa migration éventuelle, mais cette migration est alors orientée vers cette électrode, empêchant un amorçage sur l'enveloppe mise à la terre. L'électrode de révolution est suffisamment éloignée du contact mobile et des parties au potentiel de ce contact, pour tenir la tension d'isolement. L'électrode de révolution est également à une distance suffisante de l'enveloppe métallique mise à la terre pour éviter tout claquage entre cette électrode et l'enveloppe. A cet effet, l'enveloppe métallique présente avantageusement au niveau de l'électrode de révolution une section élargie suffisante pour assurer la tenue diélectrique de l'installation. L'enveloppe peut être sphérique ou de forme cylindrique de section agrandie, raccordée par des parties tronconiques aux gaines cylindriques de l'installation.By surrounding the arc zone with an electrode connected to the fixed contact, neither the formation of the arc nor its possible migration is prevented, but this migration is then oriented towards this electrode, preventing initiation on the envelope placed Earth. The revolution electrode is sufficiently far from the movable contact and parts at the potential of this contact, to maintain the insulation voltage. The electrode of revolution is also at a sufficient distance from the grounded metal casing to avoid any breakdown between this electrode and the casing. To this end, the metal casing advantageously has at the level of the electrode of revolution an enlarged section sufficient to ensure the dielectric strength of the installation. The envelope may be spherical or of cylindrical shape of enlarged section, connected by frustoconical parts to the cylindrical sheaths of the installation.

La longueur de l'électrode de révolution correspond sensiblement à la longueur de séparation des contacts pour éviter tout cheminement de l'arc vers l'enveloppe mise à la terre. Les bords de l'électrode de révolution sont arrondis pour assurer une bonne répartition du champ et limiter les risques d'amorçage. L'électrode est de préférence en forme d'anneau, par exemple de tore de section circulaire, enveloppant coaxialement les contacts du sectionneur. L'anneau de révolution est fixé au contact fixe par des bras assurant en meme temps la connexion électrique, ces bras se raccordant tangentiellement à la partie externe de l'anneau. Les bras peuvent appartenir ou être remplacés par une calotte pleine formant un véritable écran entre le contact fixe et l'électrode annulaire empêchant tout passage de l'arc dans cet intervalle.The length of the electrode of revolution corresponds substantially to the length of separation of the contacts to avoid any path from the arc to the grounded enclosure. The edges of the electrode of revolution are rounded to ensure a good distribution of the field and to limit the risks of priming. The electrode is preferably in the form of a ring, for example a toroid of circular section, coaxially enveloping the contacts of the disconnector. The ring of revolution is fixed to the fixed contact by arms ensuring at the same time the electrical connection, these arms tangentially connecting to the external part of the ring. The arms can belong or be replaced by a full cap forming a real screen between the fixed contact and the annular electrode preventing any passage of the arc in this interval.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de mise en oeuvre de l'invention, donné à titre d'exemple non limitatif et représenté à la figure unique annexée, qui est une coupe axiale d'un sectionneur selon l'invention, représenté en cours d'ouverture des contacts.Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, given by way of nonlimiting example and shown in the attached single figure, which is an axial section of a disconnector according to the invention, shown during the opening of the contacts.

Sur la figure, une enveloppe métallique 10 étanche et mise à la terre est remplie d'un gaz à rigidité diélectrique élevée, notamment d'héxafluorure de soufre. L'enveloppe 10 présente des brides 12, 14, de raccordement à des gaines cylindriques 16, 18, appartenant à l'enveloppe d'un poste blindé. Les gaines 16, 18, entourent coaxialement des conducteurs ou barres 20, 22, supportés par des isolateurs 24, intercalés entre les brides 12, 14. Dans l'exemple illustré par la figure, les barres 20, 22, sont perpendiculaires, mais il est clair que l'invention s'applique à des barres alignées ou s'étendant suivant des directions obliques. L'extrémité 26 de la barre 20 à l'intérieur de l'enveloppe 10 porte un contact fixe 28 ayant des pinces de contact 30, disposées en forme de tulipe pour entourer coaxialement un contact mobile 32, en forme de broche coulissante. La broche 32 est reliée par une tige 34 à un mécanisme de manoeuvre 36 susceptible de déplacer la broche 32 axialement pour venir sélectivement en une position de fermeture d'engagement entre les pinces 30 de contact fixe et d'ouverture du sectionneur à une distance "d" de séparation du contact fixe 28. La broche 32 est connectée électriquement par des contacts frottants 38 à l'extrémité de la barre 22 interne à l'enveloppe 10. Le contact fixe 28 et le contact mobile 32 sont chacun équipé d'un capot 40, 42, de forme hémisphérique assurant une bonne répartition du champ autour de ces contacts. Les capots 40, 42, présentent une ouverture axiale de passage de la broche de contact 32. Le contact fixe 28 peut présenter de plus un doigt d'arc 44 disposé axialement entre les pinces de contact 30 et s'étendant jusqu'aux bords du capot 40. La broche coulissante 32 présente, lorsque le doigt 44 existe, un évidement interne conjugé 46 dans lequel pénètre le doigt 44 en position de fermeture du sectionneur. Un tel sectionneur, bien connu des spécialistes, permet d'établir ou de rompre la connexion entre les conducteurs 20, 22, par simple coulissement, de la broche mobile 32, actionné par le mécanisme de manoeuvre 36.In the figure, a sealed and earthed metal casing 10 is filled with a gas with high dielectric strength, in particular sulfur hexafluoride. The envelope 10 has flanges 12, 14, for connection to cylindrical sheaths 16, 18, belonging to the envelope of an armored station. The sheaths 16, 18 surround coaxially conductors or bars 20, 22, supported by insulators 24, interposed between the flanges 12, 14. In the example illustrated by the figure, the bars 20, 22, are perpendicular, but it It is clear that the invention applies to bars aligned or extending in oblique directions. The end 26 of the bar 20 inside the casing 10 carries a fixed contact 28 having contact clamps 30, arranged in the form of a tulip to coaxially surround a movable contact 32, in the form of a sliding pin. The pin 32 is connected by a rod 34 to an operating mechanism 36 capable of displacing the pin 32 axially to come selectively into a closed position of engagement between the clamps 30 of fixed contact and opening of the disconnector at a distance " d "for separating the fixed contact 28. The pin 32 is electrically connected by rubbing contacts 38 at the end of the bar 22 internal to the casing 10. The fixed contact 28 and the movable contact 32 are each equipped with a cover 40, 42, of hemispherical shape ensuring good distribution of the field around these contacts. The covers 40, 42 have an axial opening for the passage of the contact pin 32. The fixed contact 28 can also have an arcing finger 44 disposed axially between the contact clamps 30 and extending to the edges of the cover 40. The sliding pin 32 has, when the finger 44 exists, a combined internal recess 46 into which the finger 44 enters in the closed position of the disconnector. Such a disconnector, well known to specialists, makes it possible to establish or break the connection between the conductors 20, 22, by simple sliding, of the movable pin 32, actuated by the operating mechanism 36.

Selon l'invention, l'enveloppe métallique 10 est en forme de sphère d'une section supérieure à celle des gaines 16, 18, et l'ensemble de contact fixe 28, contact mobile 32, est disposé sensiblement au centre de cette sphère. Une électrode annulaire 48, en forme de tore, est disposée dans le plan diamétral de la sphère 10, perpendiculaire à la broche 32 de contact mobile, en entourant coaxialement, l'intervalle de séparation "d" des contacts fixe 28 et mobile 32. L'électrode de révolution 48 est intercalée entre l'enveloppe métallique 10 et l'intervalle de séparation "d" qui constitue la zone de formation d'un arc, lors d'une coupure de courant capacitif ou inductif. Le diamètre du tore 48 est sensiblement équivalent à la distance "d" d'isolement entre les contacts fixe 28 et mobiles 32 en position séparée. L'électrode annulaire 48 est fixée par des bras ou une calotte 50 au contact fixe 28. Ces bras se raccordent tangentiellement aux bords externes 52 du tore pour présenter une forme arrondie évitant toute concentration du champ électrique. Des extrémités opposées des bras 50 sont fixées à l'arrière du contact fixe 28 à l'abri du capot répartiteur 40. Les bras 50 assurent le support mécanique et la liaison électrique de l'électrode annulaire 48 au contact fixe 28. En se référant à la figure, on voit que la distance de séparation de l'électrode annulaire 48 au contact mobile 32 et au capot répartiteur 42 est toujours supérieure ou égale à la distance d'isolement "d" séparant les contacts fixe 28 et mobile 32 en position d'ouverture, de manière à assurer une tenue diélectrique suffisante. D'une manière analogue, l'électrode annulaire 48 est suffisamment distante de l'enveloppe métallique 10 mise à la terre, pour éviter tout claquage entre cette électrode et l'enveloppe 10.According to the invention, the metal casing 10 is in the form of a sphere with a section greater than that of the sheaths 16, 18, and the fixed contact assembly 28, movable contact 32, is disposed substantially in the center of this sphere. An annular electrode 48, in the shape of a torus, is arranged in the diametrical plane of the sphere 10, perpendicular to the movable contact pin 32, coaxially surrounding the separation gap "d" of the fixed 28 and movable 32 contacts. The electrode of revolution 48 is interposed between the metal casing 10 and the separation interval "d" which constitutes the zone of formation of an arc, during a cut of capacitive or inductive current. The diameter of the torus 48 is substantially equivalent to the distance "d" of insulation between the fixed contacts 28 and movable 32 in a separate position. The annular electrode 48 is fixed by arms or a cap 50 to the fixed contact 28. These arms are tangentially connected to the outer edges 52 of the torus to have a rounded shape avoiding any concentration of the electric field. Opposite ends of the arms 50 are fixed at the rear of the fixed contact 28 sheltered from the distributor cover 40. The arms 50 provide the mechanical support and the electrical connection of the annular electrode 48 to the fixed contact 28. With reference to in the figure, it can be seen that the separation distance from the annular electrode 48 to the movable contact 32 and to the distributor cover 42 is always greater than or equal to the isolation distance "d" separating the fixed contacts 28 and movable 32 in open position, so as to ensure sufficient dielectric strength. In an analogous manner, the annular electrode 48 is sufficiently distant from the grounded metal casing 10, to avoid any breakdown between this electrode and the casing 10.

Le fonctionnement du sectionneur d'isolement ressort de l'exposé précédent :

  • en position de fermeture du sectionneur, la broche 32 est engagée entre les pinces 30 du contact fixe 28 et assure la connexion entre les barres 20, 22. L'ouverture du sectionneur est commandée par le mécanisme 36 qui impose un mouvement de coulissement de la broche 32 vers le bas sur la figure. Lors de la séparation des contacts 28, 32, un arc s'amorce entre le doigt d'arc 44 et l'extrémité de la broche 32, de la manière représentée sur la figure, cet arc (ou un arc secondaire issu du premier) étant susceptible de migrer sur le capot répartiteur 40 et de là sur l'électrode annulaire 48. IL est facile de voir que l'électrode 48 empêche tout passage de l'arc vers l'enveloppe métallique 10, notamment entre le contact fixe 28 et l'électrode 48, la distance à franchir pour atteindre l'enveloppe 10, mise à la terre étant toujours supérieure à celle pour atteindre l'électrode 48 ou l'écran répartiteur 40. La calotte 50 qui peut être pleine ou ajourée pour former des bras de support, constitue un écran additionnel de barrage. Tout risque de mise à la terre est ainsi évité.
The operation of the isolation disconnector is clear from the previous description:
  • in the disconnector closed position, the pin 32 is engaged between the clamps 30 of the fixed contact 28 and ensures the connection between the bars 20, 22. The opening of the disconnector is controlled by the mechanism 36 which imposes a sliding movement of the pin 32 down in the figure. During the separation of the contacts 28, 32, an arc strikes between the arcing finger 44 and the end of the pin 32, as shown in the figure, this arc (or a secondary arc from the first) being likely to migrate on the distributor cover 40 and from there on the annular electrode 48. It is easy to see that the electrode 48 prevents any passage of the arc towards the metallic envelope 10, in particular between the fixed contact 28 and the electrode 48, the distance to be crossed to reach the casing 10, grounded always being greater than that to reach the electrode 48 or the distributor screen 40. The cap 50 which can be full or perforated to form support arm, constitutes an additional barrier screen. Any risk of earthing is thus avoided.

L'enveloppe métallique 10 peut être en forme d'ellipsoïde ou de cylindre associé à des parties de raccordement tronconique ou de toute autre forme. La section de l'électrode de révolution 48 peut être aplatie pour constituer un oval ou un simple cylindre si l'on prend soin de munir les bords d'une partie renflée pour éviter toute pointe susceptible d'assurer une concentration des lignes de champ. En se référant à la figure, on voit que la partie interne de l'électrode de révolution 48, disposée en regard du contact fixe 28, est sans grande utilité et qu'elle peut être supprimée, l'électrode 48 se résumant dans ce cas à une partie arrondie formée par un repliement du bord de la calotte 50. Le spécialiste peut facilement imaginer d'autres formes opérantes d'une telle électrode de révolution 48. La disposition selon l'invention nécessite un volume supérieur, mais cette augmentation est largement compensée par la sécurité assurée par l'électrode 48 qui constitue une barrière quasi-infranchissable à l'arc. Dans le cas d'une enveloppe d'un diamètre suffisant il est bien entendu inutile d'accroître la section de l'enveloppe au droit de l'anneau de révolution 48. La fixation et la connexion électrique de l'électrode de révolution 48 peuvent être réalisées d'une manière différente et indépendamment l'une de l'autre, l'invention s'étendant bien entendu à toute variante de réalisation restant dans le cadre des équivalences.The metal casing 10 may be in the form of an ellipsoid or of a cylinder associated with frustoconical connection parts or of any other form. The section of the electrode of revolution 48 can be flattened to constitute an oval or a simple cylinder if care is taken to provide the edges with a swollen portion to avoid any point capable of ensuring a concentration of the field lines. Referring to the figure, it can be seen that the internal part of the electrode of revolution 48, disposed opposite the fixed contact 28, is of little use and that it can be removed, the electrode 48 being summed up in this case to a rounded part formed by a folding of the edge of the cap 50. The specialist can easily imagine other operating forms of such an electrode of revolution 48. The arrangement according to invention requires a larger volume, but this increase is largely offset by the security provided by the electrode 48 which constitutes an almost impassable barrier to the arc. In the case of an envelope of sufficient diameter, it is obviously unnecessary to increase the section of the envelope in line with the ring of revolution 48. The fixing and the electrical connection of the electrode of revolution 48 can be carried out in a different manner and independently of each other, the invention of course extending to any variant remaining within the framework of equivalences.

Claims (9)

  1. An isolating switch of a metalclad installation with an annular earthed metal enclosure (10) filled with a high dielectric strength gas, comprising:
    - a movable contact in the form of a sliding pin (32) capable of moving to a closed position engaged with an aligned stationary contact (28), and to an open position separated from said stationary contact by an isolation gap ("d"),
    - a field distribution shield (40) in the form of a fixed cover covering the end of the stationary contact (28) to which it is electrically connected and having a central opening for the movable contact pin (32) to pass through in the closed position of the isolating switch,
    - a field distribution shield (42) in the form of a cover associated with the movable contact (32) and arranged to cover the end of the movable contact in the open position, and electrically connected to the movable contact,
    characterized in that an auxiliary annular electrode (48) is connected to the stationary contact (28) and is fitted between the isolation gap (d) and the metal enclosure (10) extending coaxially over the whole length of said gap ("d"), said electrode (48) being arranged to pick up an arc liable to migrate from said gap to said enclosure.
  2. An isolating switch according to claim 1, characterized in that said annular enclosure (10) presents an enlarged cross-section at the level of said auxiliary annular electrode (48) to ensure a sufficient dielectric withstand between the electrode and the enclosure.
  3. An isolating switch according to claim 2, characterized in that said enclosure (10) is spherical in shape, and that said contact assembly (28, 32) is disposed substantially in the centre of the sphere.
  4. An isolating switch according to one of the preceding claims, characterized in that said auxiliary electrode (48) presents rounded edges for a good distribution of the electric field.
  5. An isolating switch according to claim 4, characterized in that said auxiliary electrode (48) is in shape of a ring having its axis aligned with said contacts (28, 32).
  6. An isolating switch according to claim 5, characterized in that said electrode (48) is a toroid of circular cross-section.
  7. An isolating switch according to one of the preceding claims, characterized in that said auxiliary electrode (48) is fitted with support and electrical connection arms (50) secured to said stationary contact (28) shielded by the field distribution cover (40).
  8. An isolating switch according to claim 7, characterized in that said arms (50) form a solid or perforated spherical portion whose circular edge (52) is tangentially connected to the external surface of the auxiliary electrode (48).
  9. An isolating switch according to one of the preceding claims, characterized in that said stationary contact (28) comprises contact grips (30) circumferentially surrounding said pin (32) in the closed position and an arcing finger (44) extending axially up to the central opening of the field distribution cover (40), capable of engaging in a conjugate axial orifice (44) of the movable pin (32) in the closed position.
EP86402681A 1985-12-20 1986-12-03 Isolator for a metal-clad high tension installation Expired - Lifetime EP0236641B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86402681T ATE73575T1 (en) 1985-12-20 1986-12-03 DISCONNECTING SWITCH OF A METAL ENCLOSED HIGH VOLTAGE SYSTEM.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8519216 1985-12-20
FR8519216A FR2592210B1 (en) 1985-12-20 1985-12-20 ISOLATION DISCONNECTOR OF A HIGH VOLTAGE SHIELDED INSTALLATION

Publications (2)

Publication Number Publication Date
EP0236641A1 EP0236641A1 (en) 1987-09-16
EP0236641B1 true EP0236641B1 (en) 1992-03-11

Family

ID=9326187

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86402681A Expired - Lifetime EP0236641B1 (en) 1985-12-20 1986-12-03 Isolator for a metal-clad high tension installation

Country Status (9)

Country Link
US (1) US4748303A (en)
EP (1) EP0236641B1 (en)
JP (1) JPH0775131B2 (en)
CN (1) CN1014373B (en)
AT (1) ATE73575T1 (en)
CA (1) CA1279355C (en)
DE (1) DE3684303D1 (en)
FR (1) FR2592210B1 (en)
IN (1) IN167847B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0719505B2 (en) * 1988-06-02 1995-03-06 株式会社東芝 Disconnector
EP0712595A1 (en) * 1994-11-21 1996-05-22 Hiroko Suzuki Dome type feather quilt
CN101527431B (en) * 2009-04-13 2010-12-29 中国西电电气股份有限公司 Supervoltage/extra-high voltage GIS isolating device
EP3819925A1 (en) * 2019-11-06 2021-05-12 General Electric Technology GmbH Improved insulating support assembly for a circuit breaker

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE412834A (en) * 1934-12-18
FR1270584A (en) * 1960-07-18 1961-09-01 Merlin Gerin Improvements to pneumatic circuit breakers having at least one tubular contact
JPS5438572A (en) * 1977-09-02 1979-03-23 Hitachi Ltd Buffer type gas circuit breaker
JPS56116228A (en) * 1980-02-16 1981-09-11 Hitachi Ltd Gas insulating interrupter
FR2483121A1 (en) * 1980-05-23 1981-11-27 Alsthom Atlantique HIGH VOLTAGE SHUTTER POST DISCONNECT
JPS58204429A (en) * 1982-05-24 1983-11-29 株式会社東芝 Gas insulated switch
FR2558301B1 (en) * 1984-01-17 1986-10-10 Merlin Gerin HIGH VOLTAGE SHIELDED STATION SWITCH EQUIPPED WITH PERFORATED SPRAY SCREENS
DE3521945A1 (en) * 1985-06-14 1986-12-18 Siemens AG, 1000 Berlin und 8000 München DISCONNECTOR FOR A METAL-ENCLOSED, PRESSURE-GAS INSULATED HIGH-VOLTAGE SWITCHGEAR

Also Published As

Publication number Publication date
JPH0775131B2 (en) 1995-08-09
DE3684303D1 (en) 1992-04-16
US4748303A (en) 1988-05-31
FR2592210B1 (en) 1990-07-27
IN167847B (en) 1990-12-29
CN1014373B (en) 1991-10-16
FR2592210A1 (en) 1987-06-26
CN86108278A (en) 1987-07-01
JPS62160621A (en) 1987-07-16
ATE73575T1 (en) 1992-03-15
EP0236641A1 (en) 1987-09-16
CA1279355C (en) 1991-01-22

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