EP0419386B1 - Arrester device with visible fault-indicator - Google Patents

Arrester device with visible fault-indicator Download PDF

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Publication number
EP0419386B1
EP0419386B1 EP19900420416 EP90420416A EP0419386B1 EP 0419386 B1 EP0419386 B1 EP 0419386B1 EP 19900420416 EP19900420416 EP 19900420416 EP 90420416 A EP90420416 A EP 90420416A EP 0419386 B1 EP0419386 B1 EP 0419386B1
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EP
European Patent Office
Prior art keywords
bracelet
envelope
cover
arrester device
indicator
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
Application number
EP19900420416
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German (de)
French (fr)
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EP0419386A1 (en
Inventor
Dominique Mercier
Louis Mainier
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.)
INDUSTRIELLE DE MATERIEL ELECTRIQUE SIMEL Ste
Original Assignee
INDUSTRIELLE DE MATERIEL ELECTRIQUE SIMEL Ste
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Publication of EP0419386A1 publication Critical patent/EP0419386A1/en
Application granted granted Critical
Publication of EP0419386B1 publication Critical patent/EP0419386B1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/12—Means structurally associated with spark gap for recording operation thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors

Definitions

  • lightning arresters intended for the protection of overhead electrical networks at medium voltage most often use ceramic pellets of silicon carbide or zinc oxide, stacked under pressure between two electrodes of connection fixed to the ends of an insulating containment envelope.
  • the surge arresters are provided from place to place throughout the envisaged network, they should be made to include a visual fault indicator, suitable for allowing easy visual detection of the surge arrester (s) which are faulty and must therefore actually be replaced.
  • the invention mainly intends to remedy, by taking advantage of the pressure of the gases generated by the short-circuiting of the ceramic pellets under the effect of an excessive overload.
  • the arrester device according to the invention is defined in claim 1.
  • the invention consists in mounting on the insulating envelope, made of a deformable material, a detector bracelet which is retained in place by mechanical means arranged so as to yield, allowing the expulsion of said bracelet, under the effect swelling of the envelope following the pressure of the gases generated by the short-circuiting of the ceramic pellets.
  • the detector bracelet comprises two parts with an arc-circle profile which, at at least one of their ends, are assembled to one another using a member deformable, the longitudinal edges of these parts being provided with edges capable of bearing against the outer faces of two adjacent fins of the insulating envelope.
  • Fig. 1 is an elevational view of a lightning arrester device according to the invention, the detector bracelet having been shown in section.
  • Fig. 2 is a perspective view of this detector bracelet before it is mounted on the casing of the device.
  • a lightning arrester device of the type mentioned at the beginning of the present document, that is to say comprising, inside an insulating envelope 2, a stack of ceramic pellets maintained under axial pressure between two electrodes terminals of which we see in 3 a and 3 b the electrical connection and fixing members.
  • the casing 2 provided in the usual manner with projecting fins 4 intended to avoid the formation of an electric arc between the members 3 a and 3 b , is here made of a flexible synthetic material suitable to deform more or less elasticly.
  • the device 1 is associated with an ejectable detection bracelet 5, advantageously made of a synthetic material having a very conspicuous color (bright red for example), different from that of the deformable envelope 2.
  • this bracelet 5 is constituted by a single piece shaped so as to present two half-collars 6 with a semi-circular profile, the radius of this profile being substantially equal to the outside radius of the fins 4 of the envelope 2.
  • the two half -clamps 6 are joined to each other at a transverse zone 7, advantageously provided thinned in order to act as a hinge allowing by deformation the opening of the strap 5.
  • each half-collar 6 is integral with a lateral ear 8, perforated at 8 a for the insertion of an assembly rivet 9.
  • This rivet 9 is made of an elastically deformable synthetic material.
  • the central barrel ends at one of its ends by a cylindrical head, opposite by a shoulder whose conical or frustoconical profile is suitable for facilitate its forced introduction into the corresponding perforation 8 a , the ears 8 thus being assembled to one another by mutual approximation (arrow F).
  • each half-collar 6 are provided with flanges 10 and it is understood under these conditions that if the height (or transverse width) of the bracelet 5 is substantially equal to the mutual spacing of two adjacent fins 4 of the insulating envelope 2, said bracelet 5 is capable of being easily fixed at mid-height on this envelope in the manner illustrated in FIG. 1. Once put in place, the rivet 9 opposes any unexpected opening of the bracelet 5, thereby ensuring that it is retained on the insulating envelope 2.
  • the surveillance personnel are thus able to visually detect the surge arresters which no longer include the bracelet 5 and which must therefore be replaced.
  • the bracelet 5 can be produced in any other way than that described above by way of example; it can in particular be constituted by several separate parts, assembled and maintained using one or more deformable or breakable members.
  • a member is in particular capable of being made of metal, so as to melt under the effect of the arc generated between the two electrodes during a short circuit.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)

Abstract

Arrester device for medium-voltage aerial electrical networks, of the kind consisting of a stack of ceramic wafers enclosed inside an insulating envelope (2), characterised in that it is provided with a detector strap (5) which is held against the outer wall of the envelope (2), the latter being made of a deformable material, by mechanical means (9) arranged so as to yield, permitting the casting off of the said strap, under the effect of the inflating of the said envelope consequent upon the pressure of the gases which are generated by the short-circuiting of the ceramic wafers. <IMAGE>

Description

On sait qu'à l'heure actuelle, les dispositifs parafoudres destinés à la protection des réseaux électriques aériens à moyenne tension font le plus souvent appel à des pastilles céramique de carbure de silicium ou d'oxyde de zinc, empilées sous pression entre deux électrodes de connexion fixées aux extrémités d'une enveloppe isolante de contention. Etant donné que les parafoudres sont prévus de place en place tout au long du réseau envisagé, il y a lieu de leur faire comporter un indicateur visuel de défaut, propre à permettre la détection visuelle aisée du ou des parafoudres qui sont défaillants et doivent de ce fait être remplacés.It is known that at present, lightning arresters intended for the protection of overhead electrical networks at medium voltage most often use ceramic pellets of silicon carbide or zinc oxide, stacked under pressure between two electrodes of connection fixed to the ends of an insulating containment envelope. Given that the surge arresters are provided from place to place throughout the envisaged network, they should be made to include a visual fault indicator, suitable for allowing easy visual detection of the surge arrester (s) which are faulty and must therefore actually be replaced.

Dans cette optique, on a proposé un certain nombre de systèmes indicateurs, (voir par exemple DE-A- 2655557 et FR-A- 2603418) mais la plupart d'entre eux compliquent la construction du dispositif parafoudre lui-même, en accroissant sensiblement le prix de revient. Par ailleurs, le fonctionnement obtenu n'est pas parfaitement fiable.With this in mind, a certain number of indicator systems have been proposed (see for example DE-A-2655557 and FR-A- 2603418) but most of them complicate the construction of the arrester device itself, by appreciably increasing cost price. Furthermore, the operation obtained is not perfectly reliable.

C'est à ces inconvénients qu'entend principalement remédier l'invention, en tirant parti de la pression des gaz engendrés par la mise en court-circuit des pastilles céramique sous l'effet d'une surcharge trop forte.It is to these drawbacks that the invention mainly intends to remedy, by taking advantage of the pressure of the gases generated by the short-circuiting of the ceramic pellets under the effect of an excessive overload.

Le dispositif de parafoudre suivant l'invention est défini à la revendication 1.The arrester device according to the invention is defined in claim 1.

En fait l'invention consiste à monter sur l'enveloppe isolante, réalisée en une matière déformable, un bracelet détecteur qui est retenu en place par des moyens mécaniques agencés de manière à céder, en permettant l'expulsion dudit bracelet, sous l'effet du gonflement de l'enveloppe consécutif à la pression des gaz engendrés par la mise en court-circuit des pastilles céramique.In fact, the invention consists in mounting on the insulating envelope, made of a deformable material, a detector bracelet which is retained in place by mechanical means arranged so as to yield, allowing the expulsion of said bracelet, under the effect swelling of the envelope following the pressure of the gases generated by the short-circuiting of the ceramic pellets.

Suivant un mode de mise en oeuvre préféré, le bracelet détecteur comprend deux parties à profil en arc-decercle qui, à l'une au moins de leurs extrémités, sont assemblées l'une à l'autre à l'aide d'un organe déformable, les bords longitudinaux de ces parties étant pourvus de rebords propres à prendre appui contre les faces extérieures de deux ailettes adjacentes de l'enveloppe isolante.According to a preferred embodiment, the detector bracelet comprises two parts with an arc-circle profile which, at at least one of their ends, are assembled to one another using a member deformable, the longitudinal edges of these parts being provided with edges capable of bearing against the outer faces of two adjacent fins of the insulating envelope.

Le dessin annexé, donné à titre d'exemple, permettra de mieux comprendre l'invention, les caractéristiques qu'elle présente et les avantages qu'elle est susceptible de procurer :The attached drawing, given as an example, will allow a better understanding the invention, the characteristics which it presents and the advantages which it is capable of providing:

Fig. 1 est une vue en élévation d'un dispositif parafoudre établi suivant l'invention, le bracelet détecteur ayant été représenté en coupe.Fig. 1 is an elevational view of a lightning arrester device according to the invention, the detector bracelet having been shown in section.

Fig. 2 est une vue en perspective de ce bracelet détecteur préalablement à son montage sur l'enveloppe du dispositif.Fig. 2 is a perspective view of this detector bracelet before it is mounted on the casing of the device.

En fig. 1, on a représenté en 1 un dispositif parafoudre du type mentionné au début des présentes, c'est-à-dire comportant, à l'intérieur d'une enveloppe isolante 2, un empilage de pastilles céramique maintenues sous pression axiale entre deux électrodes terminales dont on aperçoit en 3a et 3b les organes de connexion électrique et de fixation. Il convient d'observer que l'enveloppe 2, pourvue à la manière usuelle d'ailettes en saillie 4 destinées à éviter la formation d'un arc électrique entre les organes 3a et 3b, est ici réalisée en une matière synthétique souple apte à se déformer de manière plus ou moins élastique.In fig. 1, there is shown in 1 a lightning arrester device of the type mentioned at the beginning of the present document, that is to say comprising, inside an insulating envelope 2, a stack of ceramic pellets maintained under axial pressure between two electrodes terminals of which we see in 3 a and 3 b the electrical connection and fixing members. It should be observed that the casing 2, provided in the usual manner with projecting fins 4 intended to avoid the formation of an electric arc between the members 3 a and 3 b , is here made of a flexible synthetic material suitable to deform more or less elasticly.

Au dispositif 1 est associé un bracelet éjectable de détection 5, avantageusement établi en une matière synthétique présentant une couleur très voyante (rouge vif par exemple), différente de celle de l'enveloppe déformable 2.The device 1 is associated with an ejectable detection bracelet 5, advantageously made of a synthetic material having a very conspicuous color (bright red for example), different from that of the deformable envelope 2.

Comme montré en fig. 2, ce bracelet 5 est constitué par une pièce unique conformée de façon à présenter deux demi-colliers 6 à profil semi-circulaire, le rayon de ce profil étant sensiblement égal au rayon extérieur des ailettes 4 de l'enveloppe 2. Les deux demi-colliers 6 sont réunis l'un à l'autre au niveau d'une zone transversale 7, avantageusement prévue amincie afin de faire fonction de charnière permettant par déformation l'ouverture du bracelet 5. A l'opposé de cette zone 7, chaque demi-collier 6 est solidaire d'une oreille latérale 8, perforée en 8a pour l'insertion d'un rivet d'assemblage 9.As shown in fig. 2, this bracelet 5 is constituted by a single piece shaped so as to present two half-collars 6 with a semi-circular profile, the radius of this profile being substantially equal to the outside radius of the fins 4 of the envelope 2. The two half -clamps 6 are joined to each other at a transverse zone 7, advantageously provided thinned in order to act as a hinge allowing by deformation the opening of the strap 5. Unlike this zone 7, each half-collar 6 is integral with a lateral ear 8, perforated at 8 a for the insertion of an assembly rivet 9.

Ce rivet 9 est établi en une matière synthétique élastiquement déformable. A la façon en soi connue dans ce type d'organe, le fût central se termine à l'une de ses extrémités par une tête cylindrique, à l'opposé par un épaulement dont le profil conique ou tronconique est propre à faciliter son introduction à force dans la perforation correspondante 8a, les oreilles 8 étant ainsi assemblées l'une à l'autre moyennant rapprochement mutuel (flèche F).This rivet 9 is made of an elastically deformable synthetic material. In the manner known per se in this type of organ, the central barrel ends at one of its ends by a cylindrical head, opposite by a shoulder whose conical or frustoconical profile is suitable for facilitate its forced introduction into the corresponding perforation 8 a , the ears 8 thus being assembled to one another by mutual approximation (arrow F).

On notera encore que les bords longitudinaux de chaque demi-collier 6 sont pourvus de rebords 10 et l'on comprend dans ces conditions que si la hauteur (ou largeur transversale) du bracelet 5 est sensiblement égale à l'écartement mutuel de deux ailettes adjacentes 4 de l'enveloppe isolante 2, ledit bracelet 5 est susceptible d'être aisément fixé à mi-hauteur sur cette enveloppe à la manière illustrée en fig. 1. Une fois mis en place, le rivet 9 s'oppose à toute ouverture inopinée du bracelet 5 en assurant de la sorte la retenue de celui-ci sur l'enveloppe isolante 2.It will also be noted that the longitudinal edges of each half-collar 6 are provided with flanges 10 and it is understood under these conditions that if the height (or transverse width) of the bracelet 5 is substantially equal to the mutual spacing of two adjacent fins 4 of the insulating envelope 2, said bracelet 5 is capable of being easily fixed at mid-height on this envelope in the manner illustrated in FIG. 1. Once put in place, the rivet 9 opposes any unexpected opening of the bracelet 5, thereby ensuring that it is retained on the insulating envelope 2.

On conçoit néanmoins que cette retenue en place présente un caractère relativement précaire par suite de la déformabilité de la matière qui constitue le rivet. Aussi, dans le cas où à la suite d'un court-circuit ou d'une avarie l'empilage de pastilles céramique contenu dans l'enveloppe 2 vient à engendrer des gaz sous une forte pression, cette enveloppe 2 gonfle radialement ; à un instant donné l'effort ainsi produit est suffisant pour déformer le rivet 9 qui cède brusquement. Le bracelet 5 s'ouvre et est expulsé loin du dispositif parafoudre.However, it is understood that this retention in place has a relatively precarious nature as a result of the deformability of the material which constitutes the rivet. Also, in the event that following a short circuit or damage, the stacking of ceramic pellets contained in the envelope 2 comes to generate gases under high pressure, this envelope 2 swells radially; at a given instant the effort thus produced is sufficient to deform the rivet 9 which suddenly gives way. The bracelet 5 opens and is expelled far from the arrester device.

Le personnel de surveillance est ainsi à même de détecter visuellement les parafoudres qui ne comportent plus le bracelet 5 et qui doivent de ce fait être remplacés.The surveillance personnel are thus able to visually detect the surge arresters which no longer include the bracelet 5 and which must therefore be replaced.

Il va de soi que le bracelet 5 peut être réalisé de toute autre manière que celle décrite ci-dessus à titre d'exemple ; il peut en particulier être constitué par plusieurs pièces séparées, assemblées et maintenues à l'aide d'un ou de plusieurs organes déformables ou sécables. Un tel organe est notamment susceptible d'être réalisé en métal, de façon à fondre sous l'effet de l'arc engendré entre les deux électrodes à l'occasion d'un court-circuit.It goes without saying that the bracelet 5 can be produced in any other way than that described above by way of example; it can in particular be constituted by several separate parts, assembled and maintained using one or more deformable or breakable members. Such a member is in particular capable of being made of metal, so as to melt under the effect of the arc generated between the two electrodes during a short circuit.

Claims (2)

  1. Arrester device for electric aerial circuits of medium voltage, of the type which consists of a stack of ceramic pellets enclosed inside an insulating cover (2), characterised in that it is provided with a detector bracelet (5) which is retained around the outer surface of the cover (2), made from a flexible material, by mechanical means (9), arranged so as to give way, allowing the expulsion of said bracelet, under the effect of the inflation of said cover resulting from the pressure of the gas generated by the short-circuiting of the ceramic pellets.
  2. Device according to claim 1, characterised in that the bracelet (5) comprises two half-collars (6) which at at least one end are fitted to each other by a deformable component. the longitudinal edges of the said half-collars being provided with flanges (10) suitable for bearing against the outer sides of two adjacent ribs (4) of the cover (1).
EP19900420416 1989-09-22 1990-09-20 Arrester device with visible fault-indicator Expired - Lifetime EP0419386B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912670 1989-09-22
FR8912670A FR2652457B1 (en) 1989-09-22 1989-09-22 SURGE PROTECTION DEVICE WITH VISUAL FAULT INDICATOR.

Publications (2)

Publication Number Publication Date
EP0419386A1 EP0419386A1 (en) 1991-03-27
EP0419386B1 true EP0419386B1 (en) 1994-01-05

Family

ID=9385880

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900420416 Expired - Lifetime EP0419386B1 (en) 1989-09-22 1990-09-20 Arrester device with visible fault-indicator

Country Status (4)

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EP (1) EP0419386B1 (en)
DE (1) DE69005760T2 (en)
ES (1) ES2049956T3 (en)
FR (1) FR2652457B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2678764A1 (en) * 1991-07-03 1993-01-08 Ferraz FAULT INDICATOR FOR A SPD.
SE469405B (en) * 1991-11-13 1993-06-28 Asea Brown Boveri surge

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3290547A (en) * 1964-10-19 1966-12-06 Mc Graw Edison Co Pressure relief and failure indicating means for arrester
DE1513313A1 (en) * 1965-09-15 1970-01-02 Licentia Gmbh Display device, especially for overvoltage fuses
DE2354459A1 (en) * 1973-10-31 1975-05-15 Transformatoren Union Ag Surge suppressor with overpressure release and blow off flap - has radial nozzles diametrically opposite with one piece captive flap
DE2655557A1 (en) * 1976-12-08 1978-06-15 Transformatoren Union Ag Overvoltage arrester with metal fittings in insulating cylinder - has cover element as flap on lever end engaging exhaust aperture
FR2603418B1 (en) * 1986-08-28 1988-11-10 Ferraz INDICATOR FOR SIGNALING THE SHORT-CIRCUIT OF A SPD

Also Published As

Publication number Publication date
ES2049956T3 (en) 1994-05-01
EP0419386A1 (en) 1991-03-27
FR2652457B1 (en) 1993-12-24
DE69005760T2 (en) 1994-04-28
FR2652457A1 (en) 1991-03-29
DE69005760D1 (en) 1994-02-17

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