EP0515268A1 - Varistor insertion device incorporated in an H.T. circuit breaker - Google Patents

Varistor insertion device incorporated in an H.T. circuit breaker Download PDF

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Publication number
EP0515268A1
EP0515268A1 EP92401369A EP92401369A EP0515268A1 EP 0515268 A1 EP0515268 A1 EP 0515268A1 EP 92401369 A EP92401369 A EP 92401369A EP 92401369 A EP92401369 A EP 92401369A EP 0515268 A1 EP0515268 A1 EP 0515268A1
Authority
EP
European Patent Office
Prior art keywords
tube
contact
circuit breaker
rod
sleeve
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.)
Granted
Application number
EP92401369A
Other languages
German (de)
French (fr)
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EP0515268B1 (en
Inventor
Van Doan Pham
Michel Perret
Joseph Martin
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.)
Alstom Holdings SA
Original Assignee
GEC Alsthom SA
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Publication date
Application filed by GEC Alsthom SA filed Critical GEC Alsthom SA
Publication of EP0515268A1 publication Critical patent/EP0515268A1/en
Application granted granted Critical
Publication of EP0515268B1 publication Critical patent/EP0515268B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H33/04—Means for extinguishing or preventing arc between current-carrying parts
    • H01H33/16—Impedances connected with contacts
    • H01H33/168—Impedances connected with contacts the impedance being inserted both while closing and while opening 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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
    • H01H33/76—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor
    • H01H33/765—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid wherein arc-extinguishing gas is evolved from stationary parts; Selection of material therefor the gas-evolving material being incorporated in the contact material

Definitions

  • the present invention relates to a device allowing electrical insertion in parallel on the contacts of a circuit breaker, during the opening and closing of the latter, of a varistor or of a resistor or of an assembly comprising both a resistor and a varistor, this varistor or this resistor or this assembly being disposed inside the envelope containing the breaking chamber of the circuit breaker.
  • a circuit breaker comprising, inside the breaking chamber, auxiliary contacts allowing insertion for a limited period after the separation of the contacts of the circuit breaker, of a capacity .
  • a hook keeps the auxiliary contacts engaged against the action of a compressed spring; clearing the hook releases the spring which opens the auxiliary contacts.
  • the spring is again compressed by an arm linked to the main moving contact of the circuit breaker.
  • Such a device is bulky and complex, which increases the price of the device due to the need to greatly increase the volume of the breaking chamber; such a device is heavy and increases the energy required to operate the circuit breaker; such a device has a spring which is compressed while the circuit breaker is open, which presents the risk of inadvertent reclosing of the device and goes seriously against safety.
  • Another object of the invention is to provide a device allowing insertion for a sufficient time after the separation of the arcing contacts during opening of the circuit breaker to allow effective reduction of opening overvoltages.
  • the device necessarily comprises two contacts which separate after insertion; another object of the invention is to provide an insertion device which, after the insertion time has elapsed, performs rapid disinsertion so as to cut the residual arc without difficulty.
  • Another object of the invention is to provide an insertion device which, despite a rapid relative displacement of its constituent elements, has damping means to avoid sudden operation.
  • Another object of the invention is to provide a device allowing insertion on opening and also, if desired by the user, on closing of the circuit breaker.
  • the invention relates to a device for the momentary insertion, in parallel on the contacts of a circuit breaker, at the start of the opening or at the start of the closing of said circuit breaker, of an electrical component chosen from among the resistors, varistors, capacitors or a combination of these elements, said circuit breaker comprising, for each phase, at least one breaking chamber comprising a sealed insulating envelope filled with good gases dielectric properties and comprising inside a fixed main contact connected to a first socket and a fixed arcing contact, and a movable assembly comprising a movable main contact connected to a second socket, a movable arcing contact and an operating rod, said circuit breaker further comprising inside said chamber said electrical component connected on the one hand to said first socket and on the other hand to at least one contact arm carrying a contact ring, characterized in that it comprises a metal tube mechanically and electrically connected to said movable main contact, a rod which can slide inside said tube, said rod comprising at a first end a metal contact s
  • said stop carries an O-ring and is made of polytetrafluoroethylene.
  • the end of the contact sleeve adjacent to the contact arm is made of a metallic material impregnated with a product giving off, under the effect of the electric arc, a gas.
  • the arm contact is made in the form of a tube provided at one end with contact fingers and provided with a partition to delimit a blowing volume, an insulating nozzle surrounding the contact fingers.
  • the reference 1 designates an insulating envelope, preferably of porcelain, delimiting a volume 2 containing the breaking elements of the circuit breaker.
  • the insulating envelope is closed at one end by a metal plate 3, fixed to a metal crown 4 constituting a first and extended socket, inside the envelope by arms 5 to which are fixed a first metal tube 6 constituting the main fixed contact, and a second tube 7, coaxial with the first, constituting the fixed arcing contact.
  • Volume 2 is filled with a gas with good dielectric properties, such as sulfur hexafluoride, under a pressure of a few bars.
  • the mobile assembly of the circuit breaker comprises a metal tube 9, extended by a corona hood 10, and provided with a transverse metal partition 11 carrying contact fingers 12 constituting the movable main contact, and a blowing tube 13 extended by contact fingers 14 constituting the movable arcing contact.
  • the partition 11, pierced with holes 15 for the passage of the blowing gas, carries a blowing nozzle 17 made of insulating material.
  • the blowing is provided by a fixed piston placed inside the tube 9, and not shown in FIG. 1.
  • the tube 9 is connected, by sliding contacts, not shown, to a second outlet of the circuit breaker.
  • a varistor is placed inside the volume 2. This consists of a stack of discs 18 placed in an insulating tube 19, fixed at one end to the plate 3 and closed at the other end by a metal block 20 .
  • the varistor can be associated with several ohmic elements (resistance); the invention also applies to circuit breakers in which there are only ohmic elements.
  • the invention applies to any circuit breaker in which an electrical component (varistor, resistor, capacitor, or any combination of these elements) must be inserted, either at the opening of the circuit breaker, or at the closing , either during these two maneuvers.
  • the insertion device of the invention is generally represented at 30 in FIG. 1. It cooperates with a contact consisting of arms 31, fixed to the metal block 20 and carrying a metal crown 31A ..
  • FIG. 2A A detailed embodiment of the insertion device is shown in Figures 2A and 2B.
  • the insertion device comprises a metal tube 32, having a projection 32A by which the tube is mechanically fixed and electrically connected to the tube 9, for example by brazing.
  • a sleeve 33 for example made of Teflon.
  • the sleeve 33 and the tube 32 define a housing in which is housed a first end of a spring 34 which bears against a shoulder 32B formed inside the tube 32.
  • the sleeve 33 is screwed onto the shoulder 32C.
  • An insulating washer 35 is glued to the upper end of the tube 32.
  • the lower end of the tube 32 has an inner profile 32D of conical shape, the role of which will be explained below.
  • a rod 37 for example made of high-strength brass, terminated by a portion 37 A of larger diameter pierced with a threaded bore 37B.
  • a shoulder 37C serves as a support for the second end of the spring 34.
  • a stop or ring 38 On the lower end of the portion 37A is engaged a stop or ring 38, with conical external profile, preferably made made of polytetrafluoroethylene, and provided with an O-ring 39.
  • the ring 38 is held in place by the head of a bolt 40, screwed into the bore 37B with the interposition of rings 41 and 42.
  • a contact sleeve 43 advantageously made of copper.
  • the device also allows the varistor to be inserted when the circuit breaker closes. It is enough for this that the end of the sleeve 43 comes into contact with the ring 31A before the arcing contacts 7 and 14 come into contact.
  • the distance a determines the insertion time at closing, the duration of which is usually of the order of 8 ms. If, at rest, the end of the movable arcing contact 14 and the end 43A of the contact sleeve 43 are at the same level, and if the distance a is zero, there can be no insertion of the varistor when closing of the circuit breaker.
  • FIG. 3 represents an alternative embodiment of the device, which can advantageously be used for circuit-breakers with a metal ground shell, in which there is a relatively large space around the breaking elements.
  • the contact arms 31 are replaced by a tube 50 terminated by contact fingers 51.
  • the tube has a bottom 53, so that its internal volume 56 constitutes a blowing volume of the arc which is established at the separation of the fingers 51 and the contact 43A.
  • a nozzle 54 made of an insulating material such as polytetrafluoroethylene, promotes this blowing.
  • the tube 32 of the device is fixed to the movable tube by an arm 55.
  • distance a is equal to zero, there is no insertion of a varistor when the circuit breaker closes.
  • the invention applies to high-voltage circuit breakers of the conventional type with a ceramic shell or of the type with a metal shell on the ground.

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  • Circuit Breakers (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

Device for the momentary insertion, in parallel with the contacts of a circuit breaker, of an electric component, such as a varistor, connected to a contact arm carrying a contact ring, characterised in that it comprises a metal tube (32) connected mechanically and electrically to the main moving contact (9), a rod (37) being able to slide inside the said tube, the said rod comprising at a first end a metal contact sleeve (43) which can come into electrical contact with the said contact ring (31A), the said sleeve running into a stop on a first end of the said tube (32), the second end of the said tube being provided with a conical stop (38), the second end of the said tube (32) having, internally, a conical shape complementary to that of the said stop (38). <IMAGE>

Description

La présente invention est relative à un dispositif permettant l'insertion électrique en parallèle sur les contacts d'un disjoncteur, lors de l'ouverture et de la fermeture de ce dernier, d'une varistance ou d'une résistance ou d'un ensemble comprenant à la fois une résistance et une varistance, cette varistance ou cette résistance ou cet ensemble étant disposée à l'intérieur de l'enveloppe contenant la chambre de coupure du disjoncteur.The present invention relates to a device allowing electrical insertion in parallel on the contacts of a circuit breaker, during the opening and closing of the latter, of a varistor or of a resistor or of an assembly comprising both a resistor and a varistor, this varistor or this resistor or this assembly being disposed inside the envelope containing the breaking chamber of the circuit breaker.

On connaît, par la demande de brevet anglais 2 032 180, un disjoncteur comportant, à l'intérieur de la chambre de coupure, des contacts auxiliaires permettant l'insertion pendant une durée limitée après la séparation des contacts du disjoncteur, d'une capacité. A cet effet, un crochet maintient les contacts auxiliaires enclenchés contre l'action d'un ressort comprimé; l'effeacement du crochet libère le ressort qui ouvre les contacts auxiliaires. En fin de manoeuvre, le ressort est de nouveau comprimé par un bras lié au contact principal mobile du disjoncteur.Known from English patent application 2,032,180, a circuit breaker comprising, inside the breaking chamber, auxiliary contacts allowing insertion for a limited period after the separation of the contacts of the circuit breaker, of a capacity . To this end, a hook keeps the auxiliary contacts engaged against the action of a compressed spring; clearing the hook releases the spring which opens the auxiliary contacts. At the end of the operation, the spring is again compressed by an arm linked to the main moving contact of the circuit breaker.

Un tel dispositif est volumineux et complexe, ce qui grève le prix de l'appareil en raison de la nécessité d'accroître fortement le volume de la chambre de coupure; un tel dispositif est lourd et accroît l'énergie nécessaire à la manoeuvre du disjoncteur; un tel dispositif présente un ressort qui est comprimé alors que le disjoncteur est ouvert, ce qui présente des risques de refermeture intempestive de l'appareil et va gravement à l'encontre de la sécurité.Such a device is bulky and complex, which increases the price of the device due to the need to greatly increase the volume of the breaking chamber; such a device is heavy and increases the energy required to operate the circuit breaker; such a device has a spring which is compressed while the circuit breaker is open, which presents the risk of inadvertent reclosing of the device and goes seriously against safety.

Un but de l'invention est de réaliser un appareil simple, pouvant être installé sur les disjoncteurs existants sans grever notablement leur prix de revient et, en particulier, pouvant être logé dans l'enveloppe de la chambre de coupure sans accroître la dimension de celle-ci; un autre but de l'invention est de réaliser un appareil léger qui ne nécessite pas d'accroître l'énergie de manoeuvre du disjoncteur; un autre but de l'invention est de réaliser un appareil dans lequel le ressort est détendu lorsque le disjoncteur est ouvert, ce qui accroît la sécurité de l'appareil.An object of the invention is to provide a simple device which can be installed on existing circuit breakers without significantly increasing their cost price and, in particular, which can be housed in the envelope of the switching chamber without increase its dimension; another object of the invention is to provide a light device which does not require increasing the operating energy of the circuit breaker; another object of the invention is to provide a device in which the spring is relaxed when the circuit breaker is open, which increases the safety of the device.

Un autre but de l'invention est de réaliser un dispositif permettant l'insertion pendant un temps suffisant après la séparation des contacts d'arc lors d'une ouverture du disjoncteur pour permettre de réduire efficacement les surtensions d'ouverture.Another object of the invention is to provide a device allowing insertion for a sufficient time after the separation of the arcing contacts during opening of the circuit breaker to allow effective reduction of opening overvoltages.

Le dispositif comprend nécessairement deux contacts qui se séparent après l'insertion; un autre but de l'invention est de réaliser un dispositif d'insertion qui, après écoulement du temps d'insertion, effectue une désinsertion rapide de manière à couper sans difficulté l'arc résiduel.The device necessarily comprises two contacts which separate after insertion; another object of the invention is to provide an insertion device which, after the insertion time has elapsed, performs rapid disinsertion so as to cut the residual arc without difficulty.

Un autre but de l'invention est de réaliser un dispositif d'insertion qui, malgré un déplacement relatif rapide de ses éléments constitutifs, possède des moyens d'amortissement pour éviter tout à-coup de fonctionnement.Another object of the invention is to provide an insertion device which, despite a rapid relative displacement of its constituent elements, has damping means to avoid sudden operation.

Un autre but de l'invention est de réaliser un dispositif permettant l'insertion à l'ouverture et aussi, si souhaité par l'utilisateur, à la fermeture du disjoncteur.Another object of the invention is to provide a device allowing insertion on opening and also, if desired by the user, on closing of the circuit breaker.

L'invention a pour objet un dispositif pour l'insertion momentanée, en parallèle sur les contacts d'un disjoncteur, au début de l'ouverture ou au début de la fermeture dudit disjoncteur, d'un composant électrique choisi parmi les résistances, les varistances, les condensateurs ou une combinaison de ces éléments, ledit disjoncteur comprenant, pour chaque phase, au moins une chambre de coupure comprenant une enveloppe isolante étanche remplie de gaz à bonnes propriétés diélectriques et comportant à son intérieur un contact principal fixe relié à une première prise de courant et un contact d'arc fixe, et un équipage mobile comprenant un contact principal mobile relié à une seconde prise de courant, un contact d'arc mobile et une tringle de manoeuvre, ledit disjoncteur comprenant en outre à l'intérieur de ladite chambre ledit composant électrique relié d'une part à ladite première prise de courant et d'autre part à au moins un bras de contact portant une couronne de contact, caractérisé en ce qu'il comprend un tube métallique relié mécaniquement et électriquement audit contact principal mobile, une tige pouvant coulisser à l'intérieur dudit tube, ladite tige comprenant à une première extrémité un manchon métallique de contact pouvant venir en contact électrique avec ladite couronne de contact, ledit manchon venant en butée sur une première extrémité dudit tube, la seconde extrémité de ladite tige étant munie d'une butée conique, la seconde extrémité dudit tube présentant intérieurement une forme conique complémentaire de celle de ladite butée , un ressort en matériau conducteur étant disposé à l'intérieur dudit tube et autour de ladite tige entre la première extrémité dudit tube et la seconde extrémité de ladite tige, ledit ressort étant détendu lorsque le disjoncteur est en position de repos enclenchée ou déclenchée.The invention relates to a device for the momentary insertion, in parallel on the contacts of a circuit breaker, at the start of the opening or at the start of the closing of said circuit breaker, of an electrical component chosen from among the resistors, varistors, capacitors or a combination of these elements, said circuit breaker comprising, for each phase, at least one breaking chamber comprising a sealed insulating envelope filled with good gases dielectric properties and comprising inside a fixed main contact connected to a first socket and a fixed arcing contact, and a movable assembly comprising a movable main contact connected to a second socket, a movable arcing contact and an operating rod, said circuit breaker further comprising inside said chamber said electrical component connected on the one hand to said first socket and on the other hand to at least one contact arm carrying a contact ring, characterized in that it comprises a metal tube mechanically and electrically connected to said movable main contact, a rod which can slide inside said tube, said rod comprising at a first end a metal contact sleeve which can come into electrical contact with said crown of contact, said sleeve abutting on a first end of said tube, the second end of said rod being provided with a conical stop, the second end of said tube having internally a conical shape complementary to that of said stop, a spring of conductive material being disposed inside said tube and around said rod between the first end of said tube and the second end of said rod, said spring being relaxed when the circuit breaker is in the rest position engaged or tripped.

Avantageusement, ladite butée porte une bague torique et est en polytétrafluoroéthylène.Advantageously, said stop carries an O-ring and is made of polytetrafluoroethylene.

Dans un mode particulier de réalisation de l'invention, l'extrémité du manchon de contact voisine du bras de contact est réalisé en un matériau métallique imprégné d'un produit dégageant, sous l'effet de l'arc électrique, un gaz.In a particular embodiment of the invention, the end of the contact sleeve adjacent to the contact arm is made of a metallic material impregnated with a product giving off, under the effect of the electric arc, a gas.

Dans un mode de réalisation applicable aux disjoncteurs à enveloppe métallique à la terre, le bras de contact est réalisé sous la forme d'un tube muni à une extrémité de doigts de contact et muni d'une cloison pour délimiter un volume de soufflage, une buse isolante entourant les doigts de contact.In an embodiment applicable to circuit breakers with a metallic shell to earth, the arm contact is made in the form of a tube provided at one end with contact fingers and provided with a partition to delimit a blowing volume, an insulating nozzle surrounding the contact fingers.

L'invention est précisée par la description de plusieurs modes de mise en oeuvre de l'invention, en référence au dessin annexé dans lequel:

  • la figure 1 est une vue partielle en coupe axiale d'une chambre de coupure avec varistance à l'intérieur de ladite chambre et dispositif d'insertion de cette varistance, selon un premier mode de réalisation de l'invention,
  • les figure 2A et 2B sont des vues agrandies en coupe axiale du dispositif d'insertion, dans des positions correspondant respectivement à l'état fermé du disjoncteur et en cours de manoeuvre d'ouverture,
  • la figure 3 est une vue en coupe axiale d'un dispositif d'insertion selon une variante de réalisation de l'invention.
The invention is clarified by the description of several embodiments of the invention, with reference to the appended drawing in which:
  • FIG. 1 is a partial view in axial section of a breaking chamber with varistor inside said chamber and device for inserting this varistor, according to a first embodiment of the invention,
  • FIGS. 2A and 2B are enlarged views in axial section of the insertion device, in positions corresponding respectively to the closed state of the circuit breaker and during the opening operation,
  • Figure 3 is an axial sectional view of an insertion device according to an alternative embodiment of the invention.

Dans la figure 1, la référence 1 désigne une enveloppe isolante, de préférence en porcelaine, délimitant un volume 2 contenant les éléments de coupure du disjoncteur. L'enveloppe isolante est fermée à une extrémité par une plaque métallique 3, fixée à une couronne métallique 4 constituant une première prise de courant et prolongée, à l'intérieur de l'enveloppe par des bras 5 auxquels sont fixés un premier tube métallique 6 constituant le contact principal fixe, et un second tube 7, coaxial au premier, constituant le contact d'arc fixe.In FIG. 1, the reference 1 designates an insulating envelope, preferably of porcelain, delimiting a volume 2 containing the breaking elements of the circuit breaker. The insulating envelope is closed at one end by a metal plate 3, fixed to a metal crown 4 constituting a first and extended socket, inside the envelope by arms 5 to which are fixed a first metal tube 6 constituting the main fixed contact, and a second tube 7, coaxial with the first, constituting the fixed arcing contact.

Le volume 2 est rempli d'un gaz à bonnes propriétés diélectriques, tel que l'hexafluorure de soufre, sous une pression de quelques bars.Volume 2 is filled with a gas with good dielectric properties, such as sulfur hexafluoride, under a pressure of a few bars.

L'équipage mobile du disjoncteur comprend un tube métallique 9, prolongé par un capot pare-effluves 10, et muni d'une cloison métallique transversale 11 portant des doigts de contact 12 constituant le contact principal mobile, et un tube de soufflage 13 prolongé par des doigts de contact 14 constituant le contact d'arc mobile. La cloison 11, percée de trous 15 pour le passage du gaz de soufflage, porte une buse de soufflage 17 en matériau isolant. Le soufflage est assuré par un piston fixe disposé à l'intérieur du tube 9, et non représenté dans la figure 1. Le tube 9 est relié, par des contacts glissants non représentés, à une deuxième prise de courant du disjoncteur.The mobile assembly of the circuit breaker comprises a metal tube 9, extended by a corona hood 10, and provided with a transverse metal partition 11 carrying contact fingers 12 constituting the movable main contact, and a blowing tube 13 extended by contact fingers 14 constituting the movable arcing contact. The partition 11, pierced with holes 15 for the passage of the blowing gas, carries a blowing nozzle 17 made of insulating material. The blowing is provided by a fixed piston placed inside the tube 9, and not shown in FIG. 1. The tube 9 is connected, by sliding contacts, not shown, to a second outlet of the circuit breaker.

Une varistance est placée à l'intérieur du volume 2. Celle-ci est constituée par un empilage de disques 18 placés dans un tube isolant 19, fixé par une extrémité à la plaque 3 et fermée à l'autre extrémité par un bloc métallique 20.A varistor is placed inside the volume 2. This consists of a stack of discs 18 placed in an insulating tube 19, fixed at one end to the plate 3 and closed at the other end by a metal block 20 .

En variante, la varistance peut être associée à plusieurs éléments ohmiques (résistance); l'invention s"applique également aux disjoncteurs dans lesquels il n'y a que des éléments ohmiques. Dans la suite on ne mentionnera, par souci de simplification, que la présence à l'intérieur de la chambre de coupure, d'une varistance, mais on doit comprendre que l'invention s'applique à tout disjoncteur dans lequel un composant électrique (varistance, résistance, condensateur, ou toute combinaison de ces éléments) doit être inséré, soit à l'ouverture du disjoncteur, soit à la fermeture, soit au cours de ces deux manoeuvres.As a variant, the varistor can be associated with several ohmic elements (resistance); the invention also applies to circuit breakers in which there are only ohmic elements. In the following we will mention, for the sake of simplification, only the presence inside the breaking chamber, of a varistor , but it should be understood that the invention applies to any circuit breaker in which an electrical component (varistor, resistor, capacitor, or any combination of these elements) must be inserted, either at the opening of the circuit breaker, or at the closing , either during these two maneuvers.

Le dispositif d'insertion de l'invention est globalement représenté en 30 dans la figure 1. Il coopère avec un contact constitué de bras 31, fixés au bloc métallique 20 et portant une couronne métallique 31A..The insertion device of the invention is generally represented at 30 in FIG. 1. It cooperates with a contact consisting of arms 31, fixed to the metal block 20 and carrying a metal crown 31A ..

Un exemple détaillé de réalisation du dispositif d'insertion est représenté dans les figures 2A et 2B.A detailed embodiment of the insertion device is shown in Figures 2A and 2B.

Le dispositif d'insertion comprend un tube métallique 32, possédant une saillie 32A par laquelle le tube est fixé mécaniquement et relié électriquement au tube 9, par exemple par brasage. A l'intérieur du tube est disposée une douille 33, par exemple en téflon. La douille 33 et le tube 32 définissent un logement dans lequel est logé une première extrémité d'un ressort 34 qui s'appuie contre un épaulement 32B pratiqué à l'intérieur du tube 32. La douille 33 est vissée sur l'épaulement 32C. Une rondelle isolantee 35 est collée à l'extrémité supérieure du tube 32. L'extrémité inférieure du tube 32 présente un profil intérieur 32D de forme conique, dont le rôle sera expliqué plus loin.The insertion device comprises a metal tube 32, having a projection 32A by which the tube is mechanically fixed and electrically connected to the tube 9, for example by brazing. Inside the tube is a sleeve 33, for example made of Teflon. The sleeve 33 and the tube 32 define a housing in which is housed a first end of a spring 34 which bears against a shoulder 32B formed inside the tube 32. The sleeve 33 is screwed onto the shoulder 32C. An insulating washer 35 is glued to the upper end of the tube 32. The lower end of the tube 32 has an inner profile 32D of conical shape, the role of which will be explained below.

A l'intérieur de la douille 33 peut coulisser une tige 37, par exemple en laiton à haute résistance, terminé par une portion 37 A de plus grand diamètre percée d'un alésage fileté 37B. Vers l'extrémité inférieure de la portion 37A, un épaulement 37C sert d'appui à la seconde extrémité du ressort 34. Sur l'extrémité inférieur de la portion 37A est engagée une butée ou bague 38, à profil extérieur conique, réalisée de préférence en polytétrafluoroéthylène, et munie d'une bague torique 39. La bague 38 est maintenue en place par la tête d'un boulon 40, vissé dans l'alésage 37B avec interposition de bagues 41 et 42.Inside the sleeve 33 can slide a rod 37, for example made of high-strength brass, terminated by a portion 37 A of larger diameter pierced with a threaded bore 37B. Towards the lower end of the portion 37A, a shoulder 37C serves as a support for the second end of the spring 34. On the lower end of the portion 37A is engaged a stop or ring 38, with conical external profile, preferably made made of polytetrafluoroethylene, and provided with an O-ring 39. The ring 38 is held in place by the head of a bolt 40, screwed into the bore 37B with the interposition of rings 41 and 42.

A la partie supérieure de la tige 37 est vissé un manchon de contact 43, réalisé avantageusement en cuivre.At the upper part of the rod 37 is screwed a contact sleeve 43, advantageously made of copper.

Le fonctionnement du dispositif est le suivant:

  • lorsque le disjoncteur est en position fermée (figures 1 et 2A), le manchon de contact 43 est en contact avec la couronne 31A et la varistance est court-circuitée par les contacts principaux et les contacts d'arc. Le ressort 34 est détendu.
  • à l'ouverture du disjoncteur, l'équipage mobile est entraîné vers le bas de la figure, entraînant le tube 32 qui comprime le ressort 34; en raison de l'inertie de la tige 37 et du manchon de contact 43, ceux-ci restent immobiles, de telle sorte que la varistance est insérée dans le circuit du disjoncteur après la séparation des contacts d'arc 7 et 14. Le courant passe alors par les bras de contact 31, la couronne 31A, le manchon de contact 43, la tige 37, le ressort 34 le tube 32 et le tube 9. Le ressort est avantageusement réalisé en cuivre au beryllium.
The operation of the device is as follows:
  • when the circuit breaker is in the closed position (Figures 1 and 2A), the contact sleeve 43 is in contact with the crown 31A and the varistor is short-circuited by the main contacts and the arcing contacts. The spring 34 is relaxed.
  • when the circuit breaker opens, the moving element is driven downwards in the figure, driving the tube 32 which compresses the spring 34; due to the inertia of the rod 37 and the contact sleeve 43, these remain stationary, so that the varistor is inserted into the circuit breaker after the separation of the arcing contacts 7 and 14. The current then passes through the contact arms 31, the crown 31A, the contact sleeve 43, the rod 37, the spring 34, the tube 32 and the tube 9. The spring is advantageously made of beryllium copper.

Lorsque le ressort arrive en fin de compression, (position de la figure 2B), la tige 37 est entraînée, ce qui produit la séparation du manchon de contact 43 et de la couronne 31A et, par suite, la désinsertion de la varistance.When the spring reaches the end of compression (position in FIG. 2B), the rod 37 is driven, which produces the separation of the contact sleeve 43 and the crown 31A and, consequently, the disinsertion of the varistor.

Lorsque l'équipage mobile du disjoncteur s'est immobilisé, la détente du ressort ramène la tige 37 dans sa position initiale par rapport au tube 32.When the moving part of the circuit breaker has come to a standstill, the rebound of the spring returns the rod 37 to its initial position relative to the tube 32.

Grâce à la partie conique du tube 32, qui coopère avec la bague conique 38, ces deux éléments ayant des formes conjuguées complémentaires l'entraînement de la tige se fait sans à-coup.Thanks to the conical part of the tube 32, which cooperates with the conical ring 38, these two elements having complementary conjugate shapes the drive of the rod is done smoothly.

Il est possible de dimensionner le dispositif de manière à ajuster le temps d'insertion de la varistance à l'ouverture du disjoncteur; pour cela, on dispose de deux paramètres:

  • d'une part, la longueur d1 correspondant à la longueur du déplacement du tube 32 avant entraînement de la tige 37 (figure 2B),
  • d'autre part, la distance a entre la couronne 31A et l'extrémité du tube 7 (figure 1). Plus la distance a est faible, plus il faut allonger la distance d1.
It is possible to size the device so as to adjust the insertion time of the varistor when the circuit breaker opens; for this, we have two parameters:
  • on the one hand, the length d1 corresponding to the length of the displacement of the tube 32 before driving the rod 37 (FIG. 2B),
  • on the other hand, the distance a between the ring 31A and the end of the tube 7 (Figure 1). The smaller the distance a, the longer the distance d1 must be extended.

Le dispositif permet également d'insérer la varistance à la fermeture du disjoncteur. Il suffit pour cela que l'extrémité du manchon de 43 vienne en contact avec la couronne 31A avant que les contacts d'arc 7 et 14 viennent en contact. La distance a détermine le temps d'insertion à la fermeture dont la durée est habituellement de l'ordre de 8 ms. Si, au repos, l'extrémité du contact d'arc mobile 14 et l'extrémité 43A du manchon de contact 43 sont au même niveau, et si la distance a est nulle, il ne peut y avoir insertion de la varistance à la fermeture du disjoncteur.The device also allows the varistor to be inserted when the circuit breaker closes. It is enough for this that the end of the sleeve 43 comes into contact with the ring 31A before the arcing contacts 7 and 14 come into contact. The distance a determines the insertion time at closing, the duration of which is usually of the order of 8 ms. If, at rest, the end of the movable arcing contact 14 and the end 43A of the contact sleeve 43 are at the same level, and if the distance a is zero, there can be no insertion of the varistor when closing of the circuit breaker.

A la séparation du manchon de contact 43 et de la couronne de contact 31A, il se produit un arc; celui-ci sera plus facilement éteint si l'extrémité 43A du manchon de contact 43 est réalisé en un matériau métallique imprégné d'un produit dégageant, sous l'action de l'arc, du gaz, tel que du fluor. On peut citer par exemple un produit à base de poudre métallique imprégnée de polymère, connu sous la marque FULMEX.On separation of the contact sleeve 43 and the contact ring 31A, an arc is produced; it will be more easily extinguished if the end 43A of the contact sleeve 43 is made of a metallic material impregnated with a product which releases, under the action of the arc, gas, such as fluorine. Mention may be made, for example, of a product based on metal powder impregnated with polymer, known under the trademark FULMEX.

La figure 3 représente une variante de réalisation du dispositif, utilisable avantageusement pour les disjoncteurs à enveloppe métallique à la masse, dans lesquels on dispose d'un espace relativement important autour des éléments de coupure. Dans cette réalisation, où les éléments communs aux figures précédentes et à la figure 3 ont reçu les mêmes numéros de référence, les bras de contact 31 sont remplacés par un tube 50 terminé par des doigts de contact 51. Le tube comporte un fond 53, de sorte que son volume intérieur 56 constitue un volume de soufflage de l'arc qui s'établit à la séparation des doigts 51 et du contact 43A. Une buse 54, en matériau isolant tel que le polytétrafluoroéthylène, favorise ce soufflage.FIG. 3 represents an alternative embodiment of the device, which can advantageously be used for circuit-breakers with a metal ground shell, in which there is a relatively large space around the breaking elements. In this embodiment, where the elements common to the preceding figures and to FIG. 3 have been given the same reference numbers, the contact arms 31 are replaced by a tube 50 terminated by contact fingers 51. The tube has a bottom 53, so that its internal volume 56 constitutes a blowing volume of the arc which is established at the separation of the fingers 51 and the contact 43A. A nozzle 54, made of an insulating material such as polytetrafluoroethylene, promotes this blowing.

Le tube 32 du dispositif est fixé au tube mobile par un bras 55. Dans ce mode de réalisation, où la distance a est égale à zéro, il n'y a pas d'insertion de varistance à la fermeture du disjoncteur.The tube 32 of the device is fixed to the movable tube by an arm 55. In this embodiment, where distance a is equal to zero, there is no insertion of a varistor when the circuit breaker closes.

On peut aussi supprimer le fond 53 et utiliser le volume 57 comme volume d'expansion thermique et de soufflage. Dans ce cas, on réalise un double soufflage de l'arc avec un écoulement de gaz vers le haut à travers le tube 50 et un écoulement de gaz vers le bas à travers le col de la buse 54.We can also remove the bottom 53 and use the volume 57 as the volume of thermal expansion and blowing. In this case, a double blowing of the arc is carried out with an upward gas flow through the tube 50 and a downward gas flow through the neck of the nozzle 54.

L'invention s'applique aux disjoncteurs à haute tension de type conventionnel à enveloppe céramique ou de type à enveloppe métallique à la terre.The invention applies to high-voltage circuit breakers of the conventional type with a ceramic shell or of the type with a metal shell on the ground.

Claims (8)

1/ Dispositif pour l'insertion momentanée, en parallèle sur les contacts d'un disjoncteur, au début de l'ouverture ou au début de la fermeture dudit disjoncteur, d'un composant électrique choisi parmi les résistances, les varistances, les condensateurs ou une combinaison de ces éléments, ledit disjoncteur comprenant, pour chaque phase, au moins une chambre de coupure comprenant une enveloppe isolante étanche remplie de gaz à bonnes propriétés diélectriques et comportant à son intérieur un contact principal fixe relié à une première prise de courant et un contact d'arc fixe, et un équipage mobile comprenant un contact principal mobile relié à une seconde prise de courant, un contact d'arc mobilee et une tringle de manoeuvre, ledit disjoncteur comprenant en outre à l'intérieur de ladite chambre ledit composant électrique relié d'une part à ladite première prise de courant et d'autre part à au moins un bras de contact (31) portant une couronne de contact (31A), caractérisé en ce qu'il comprend un tube métallique (32) relié mécaniquement et électriquement audit contact principal mobile (9), une tige (37) pouvant coulisser à l'intérieur dudit tube, ladite tige comprenant à une première extrémité un manchon métallique de contact (43) pouvant venir en contact électrique avec ladite couronne (31A), ledit manchon venant en butée sur une première extrémité dudit tube (32), la seconde extrémité de ladite tige étant munie d'une butée conique (38), la seconde extrémité dudit tube (32) présentant intérieurement une forme conique complémentaire de celle de ladite butée (38), un ressort (34) en matériau conducteur étant disposé à l'intérieur dudit tube (32) et autour de ladite tige (37) entre la première extrémité dudit tube (32) et la seconde extrémité de ladite tige (37), ledit ressort étant détendu lorsque le disjoncteur est en position de repos enclenchée ou déclenchée. 1 / Device for the momentary insertion, in parallel on the contacts of a circuit breaker, at the start of the opening or at the start of the closing of said circuit breaker, of an electrical component chosen from resistors, varistors, capacitors or a combination of these elements, said circuit breaker comprising, for each phase, at least one breaking chamber comprising a sealed insulating envelope filled with gases having good dielectric properties and comprising inside a fixed main contact connected to a first socket and a fixed arcing contact, and a moving assembly comprising a moving main contact connected to a second socket, a moving arcing contact and an operating rod, said circuit breaker further comprising inside said chamber said electrical component connected on the one hand to said first socket and on the other hand to at least one contact arm (31) carrying a contact ring (31A), characterized in that it comprises a metal tube (32) mechanically and electrically connected to said movable main contact (9), a rod (37) which can slide inside said tube, said rod comprising at a first end a metal sleeve of contact (43) which can come into electrical contact with said ring (31A), said sleeve abutting on a first end of said tube (32), the second end of said rod being provided with a conical stop (38), the second end of said tube (32) having internally a conical shape complementary to that of said stop (38), a spring (34) of conductive material being disposed inside said tube (32) and around said rod (37) between the first end of said tube (32) and the second end of said rod (37), said spring being relaxed when the circuit breaker is in the closed or tripped rest position. 2/ Dispositif selon la revendication 1, caractérisé en ce que ledit ressort (34) est guidé à une de ses extrémité par un manchon (33) isolant et coaxial audit tube (32). 2 / Device according to claim 1, characterized in that said spring (34) is guided at one of its end by a sleeve (33) insulating and coaxial with said tube (32). 3/ Dispositif selon l'une des revendications 1 et 2, caractérisé en ce que ladite butée (38) à profil extérieur conique porte une bague torique (39). 3 / Device according to one of claims 1 and 2, characterized in that said stop (38) with conical outer profile carries an O-ring (39). 4/ Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que ladite bague (38) est en polytétrafluoroéthylène. 4 / Device according to one of claims 1 to 3, characterized in that said ring (38) is made of polytetrafluoroethylene. 5/ Dispositif selon l'une des revendications 1 à 4 caractérisé en ce que l'extrémité (43A) du manchon de contact est réalisé en un matériau métallique imprégné d'un produit dégageant, sous l'effet de l'arc électrique, un gaz diélectrique. 5 / Device according to one of claims 1 to 4 characterized in that the end (43A) of the contact sleeve is made of a metallic material impregnated with a product releasing, under the effect of the electric arc, a dielectric gas. 6/ Dispositif selon l'une des revendications 1 à 5, caractérisé en ce que le bras de contact est réalisé sous la forme d'un tube (50) muni à une extrémité de doigts de contact (51) et muni d'une cloison (53) pour délimiter un volume de soufflage, une buse isolante (54) entourant les doigts de contact. 6 / Device according to one of claims 1 to 5, characterized in that the contact arm is made in the form of a tube (50) provided at one end with contact fingers (51) and provided with a partition (53) to delimit a blowing volume, an insulating nozzle (54) surrounding the contact fingers. 7/ Dispositif selon la revendication 6, caractérisé en ce que la buse isolante (54) forme avec le tube (50) un volume de soufflage (57), la cloison (53) étant supprimée. 7 / Device according to claim 6, characterized in that the insulating nozzle (54) forms with the tube (50) a blowing volume (57), the partition (53) being removed. 8/ Dispositif selon la revendication 1, caractérisé en ce que la distance (d1)correspondant à la longueur du déplacement du tube (32) avant entraînement de la tige (37) est déterminée pour obtenir un temps d'insertion de la varistance à l'ouverture de l'ordre de 8 millisecondes. 8 / Device according to claim 1, characterized in that the distance (d1) corresponding to the length of the displacement of the tube (32) before driving the rod (37) is determined to obtain an insertion time of the varistor at l opening of the order of 8 milliseconds.
EP92401369A 1991-05-22 1992-05-20 Varistor insertion device incorporated in an H.T. circuit breaker Expired - Lifetime EP0515268B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106159A FR2676857B1 (en) 1991-05-22 1991-05-22 DEVICE FOR INSERTING A VARISTOR, INCORPORATED IN A HIGH VOLTAGE CIRCUIT BREAKER.
FR9106159 1991-05-22

Publications (2)

Publication Number Publication Date
EP0515268A1 true EP0515268A1 (en) 1992-11-25
EP0515268B1 EP0515268B1 (en) 1996-01-03

Family

ID=9413003

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92401369A Expired - Lifetime EP0515268B1 (en) 1991-05-22 1992-05-20 Varistor insertion device incorporated in an H.T. circuit breaker

Country Status (7)

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US (1) US5264671A (en)
EP (1) EP0515268B1 (en)
AT (1) ATE132655T1 (en)
CA (1) CA2069185C (en)
DE (1) DE69207265T2 (en)
ES (1) ES2081584T3 (en)
FR (1) FR2676857B1 (en)

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Publication number Priority date Publication date Assignee Title
FR2712118A1 (en) * 1993-11-02 1995-05-12 Gec Alsthom T & D Sa Circuit breaker with electrical component insertion device

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US6316742B1 (en) 1999-07-14 2001-11-13 Southern States, Inc. Limited restrike circuit interrupter used as a line capacitor and load switch
US6236010B1 (en) 1999-07-14 2001-05-22 Southern States, Inc. Circuit interrupter including a penetrating electrical contact with grip and release structure
CA2851850C (en) * 2013-06-05 2015-10-20 Mersen Usa Newburyport-Ma, Llc Circuit protection device
KR101797021B1 (en) * 2014-10-23 2017-11-13 엘에스산전 주식회사 Supporting Structure of Closing Resistor of Gas Insulated Switchgear

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GB1178324A (en) * 1960-12-15 1970-01-21 Asea Ab Improvements in Air Blast Electric Circuit Breakers.
DE2459861A1 (en) * 1974-11-22 1976-05-26 Bbc Brown Boveri & Cie ELECTRIC SWITCH WITH ON RESISTOR
GB2032180A (en) * 1978-09-12 1980-04-30 Westinghouse Electric Corp Circuit-interrupters
EP0050341A2 (en) * 1980-10-20 1982-04-28 Hitachi, Ltd. Gas circuit breaker of the resistance breaking type

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DE3412824A1 (en) * 1984-04-05 1985-10-17 Doduco KG Dr. Eugen Dürrwächter, 7530 Pforzheim ELECTRIC LOAD SWITCH, ESPECIALLY FOR USE IN MEDIUM VOLTAGE SWITCHGEAR
FR2663456B1 (en) * 1990-06-14 1996-04-26 Alsthom Gec CIRCUIT BREAKER WITH INCORPORATED VARISTANCE.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1178324A (en) * 1960-12-15 1970-01-21 Asea Ab Improvements in Air Blast Electric Circuit Breakers.
DE2459861A1 (en) * 1974-11-22 1976-05-26 Bbc Brown Boveri & Cie ELECTRIC SWITCH WITH ON RESISTOR
GB2032180A (en) * 1978-09-12 1980-04-30 Westinghouse Electric Corp Circuit-interrupters
EP0050341A2 (en) * 1980-10-20 1982-04-28 Hitachi, Ltd. Gas circuit breaker of the resistance breaking type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2712118A1 (en) * 1993-11-02 1995-05-12 Gec Alsthom T & D Sa Circuit breaker with electrical component insertion device

Also Published As

Publication number Publication date
EP0515268B1 (en) 1996-01-03
FR2676857A1 (en) 1992-11-27
CA2069185C (en) 1996-07-23
FR2676857B1 (en) 1994-04-08
DE69207265T2 (en) 1996-05-15
ATE132655T1 (en) 1996-01-15
US5264671A (en) 1993-11-23
CA2069185A1 (en) 1992-11-23
ES2081584T3 (en) 1996-03-16
DE69207265D1 (en) 1996-02-15

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