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EP0443286B1 - Blitzschutzvorrichtung für elektrische Leitungen - Google Patents

Blitzschutzvorrichtung für elektrische Leitungen Download PDF

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Publication number
EP0443286B1
EP0443286B1 EP90420085A EP90420085A EP0443286B1 EP 0443286 B1 EP0443286 B1 EP 0443286B1 EP 90420085 A EP90420085 A EP 90420085A EP 90420085 A EP90420085 A EP 90420085A EP 0443286 B1 EP0443286 B1 EP 0443286B1
Authority
EP
European Patent Office
Prior art keywords
tube
varistors
stack
port
arrester 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
Application number
EP90420085A
Other languages
English (en)
French (fr)
Other versions
EP0443286A1 (de
Inventor
Christian Gazzola
Joel Gauchon
Gérard Marichy
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.)
Ferraz SA
Original Assignee
Ferraz SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ferraz SA filed Critical Ferraz SA
Publication of EP0443286A1 publication Critical patent/EP0443286A1/de
Application granted granted Critical
Publication of EP0443286B1 publication Critical patent/EP0443286B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure
    • 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

  • the present invention relates to surge protective devices intended for the protection of power lines, in particular of medium voltage overhead lines.
  • the invention especially refers to lightning arresters in which the insulation element disposed between the two terminal connection capsules is constituted by a stack of varistors based on zinc oxide (ZnO) maintained under axial pressure. It is known that in normal operation, such a stack has insulation characteristics which oppose any passage of current between the two connection capsules, while under the effect of a sudden rise in the nominal voltage due to the fall of lightning on the protected line, it temporarily becomes conductive by ensuring the earthing of said line. See also US-A-4,404,614.
  • ZnO zinc oxide
  • the present invention mainly intends to remedy, which relates to the arrester device defined in claim 1.
  • the usual rigid tube which encloses the insulation element is cut out with at least one lumen while the envelope is directly produced by molding on said element so that the synthetic resin penetrates the inside said tube and coats the stack of varistors which constitutes with the connection capsules the insulating element.
  • the ends of the outer casing of molded resin are profiled to present a lip with circular profile which is oriented axially towards the outside in order to come to engage in a corresponding annular housing. formed in each of two metal members forming contacts for mounting the arrester device.
  • Fig. 1 is an axial section showing, prior to the overmolding operation intended for the production of the external envelope, the internal core formed by the stack of varistors, the two connection capsules and the rigid protection tube.
  • Fig. 2 reproduced fig. 1 after completion of the outer envelope.
  • Fig. 3 and 4 are cross sections along the planes respectively indicated in III-III (fig. 1) and IV-IV (fig. 2).
  • Fig. 5 shows in axial section the upper end of the arrester device finally produced.
  • Fig. 6 is an elevational view illustrating an alternative embodiment of the rigid tube.
  • reference 1 designates each of the varistors based on zinc oxide, the stacking of which constitutes the insulating element of the arrester device to be produced. This stack is supported against a connection capsule 2 and receives the action of a spring 3 associated with another connection capsule 4.
  • the assembly 1-2-3-4 thus formed is housed with reduced play inside. of a glass laminate tube 5, firmly made integral with the two terminal capsules 2 and 4 by means of transverse pins 6.
  • the tube 5 is cut out from longitudinal slots 5 a (cf. fig. 3), three in number in the exemplary embodiment envisaged. Each of these lights has 5 stops short of fixing pins 6.
  • the assembly or core shown in fig. 1 is then placed inside an injection mold, shaped so that the injected synthetic resin forms an envelope 7 (fig. 2) which coats said together by determining external fins 7 a projecting.
  • the resin injected advantageously constituted by a silicone-based elastomer, penetrates inside the tube 5 through the openings 5 a thereof, so that a total filling is obtained, without any bubbles d air, from the annular gap between the varistors 1 and the tube 5, as illustrated in FIG. 4.
  • the casing 7 opens outwards by defining an axial lip 7 b with a circular profile.
  • Each of these lips 7 b is in fact intended to be forcibly engaged within an annular housing 8 has (Fig. 5) provided for this purpose in a clean metal member to form outer contact connection, consisting by an end cap 8 reported at each end of the casing 7, the fixing of said cups being effected with the aid of threaded bolts 9 are screwed into threaded bores 4a, respectively 2a, the capsules 4 and 2.
  • the appearance of an arc along the stack of varistors 1 causes the carbonization and / or the melting of the resin which fills the openings 5 a , so that under the effect of the pressure of the gases generated, the casing 7 tears along the generators corresponding to the aforementioned lights. Such a tear allows the escape of gases into the atmosphere, without sudden explosion.
  • Fig. 6 illustrates a variant implementation of the invention, according to which the rigid tube, here referenced 15, is cut from a lumen 15 a with helical profile which thus replaces the longitudinal lumens 5 a and which gives said tube 15 elastic deformability in the axial direction such as by assigning it a calculated length so that the mounting of the varistors 1 and of the capsules 2 and 4 implies a pulling effect at the level of the tube 15, it is possible to dispense with the spring 3 intended to operate the initial compression of the stack of varistors 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Thermistors And Varistors (AREA)
  • Non-Insulated Conductors (AREA)
  • Insulated Conductors (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)

Claims (5)

  1. Blitzschutzvorrichtung für elektrische Leitungen von der Art, bei der das Isolationselement aus einer wechselnden Schichtung auf der Basis von Zinkoxid (1) besteht, welches von zwei endseitig verbindenden Kapseln (2 und 4) fest zusammengehalten wird unter einem axialen inneren Druck eines starren Rohres aus isolierendem Material (5, 15), das in einem wasserdichten gespannten Gehäuse (7) aus Kunstharz angeordnet ist, dadurch gekennzeichnet, daß das starre Rohr von mindestens einem schmalen Schlitz (5a, 15a) unterbrochen ist, während das Gehäuse (7) direkt über diesem derart geformt ist, daß das Kunstharz, welches den durchdringenden Bestandteil zum Inneren dieses Rohres darstellt, zur Verfüllung des oben erwähnten Schlitzes dient, und um die Zwischenräume, die sich zwischen dem Rohr und den wechselnden Schichtungen befinden, auszufüllen.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jeder Schlitz (5a) der Länge des Rohres nach ausgerichtet ist.
  3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jeder Schlitz (15a) ein schraubenförmiges Profil aufweist, welches damit das Rohr (15) bildet, das durch elastische Deformation auf die wechselnde Schichtung (1) dem axial ausgeübten Druck standhält.
  4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die äußeren Enden des Rohres (5, 15) von endseitigen Kapseln (2, 4) jeweils unter Stützung von gegenüberliegenden Stiften (6) abgedeckt sind.
  5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Gehäuse (7) an jedem seiner äußeren Enden eine kreisförmige Lippe (7b) trägt, welche nach außen hin axial angeformt ist, um ein stabiles Einführen für eine schonende ringförmige Lagerung (8a) einer endseitigen Kupplung (8) zu erlangen, die an der korrespondierenden Kapsel (2 oder 3) mittels eines eingefaßten axialen Stiftes (9) angeordnet ist.
EP90420085A 1988-12-30 1990-02-20 Blitzschutzvorrichtung für elektrische Leitungen Expired - Lifetime EP0443286B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8817618A FR2641423B1 (fr) 1988-12-30 1988-12-30 Dispositif parafoudre pour la protection des lignes electriques

Publications (2)

Publication Number Publication Date
EP0443286A1 EP0443286A1 (de) 1991-08-28
EP0443286B1 true EP0443286B1 (de) 1994-04-27

Family

ID=9373740

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420085A Expired - Lifetime EP0443286B1 (de) 1988-12-30 1990-02-20 Blitzschutzvorrichtung für elektrische Leitungen

Country Status (6)

Country Link
EP (1) EP0443286B1 (de)
AT (1) ATE105102T1 (de)
DE (1) DE69008510T2 (de)
DK (1) DK0443286T3 (de)
ES (1) ES2051491T3 (de)
FR (1) FR2641423B1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2641423B1 (fr) * 1988-12-30 1991-05-24 Ferraz Dispositif parafoudre pour la protection des lignes electriques
FR2678764A1 (fr) * 1991-07-03 1993-01-08 Ferraz Indicateur de defaut pour un parafoudre.
FR2678765A1 (fr) * 1991-07-04 1993-01-08 Ferraz Procede de fabrication d'un parafoudre et parafoudre obtenu par mise en óoeuvre de ce procede.
CH682858A5 (de) * 1991-12-04 1993-11-30 Asea Brown Boveri Ueberspannungsableiter.
FR2685532B1 (fr) * 1991-12-20 1994-12-30 Soule Sa Parafoudre a proprietes mecaniques perfectionnees.
FR2685533B1 (fr) * 1991-12-20 1994-04-01 Soule Parafoudre comprenant une piece de contact perfectionnee.
US5363266A (en) * 1992-06-18 1994-11-08 Raychem Corporation Electrical surge arrester
FR2747500B1 (fr) * 1996-04-12 1998-06-26 Soule Materiel Electr Parafoudre perfectionne a base de varistances
DE19650579A1 (de) * 1996-12-06 1998-06-10 Asea Brown Boveri Überspannungsableiter

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4404614A (en) * 1981-05-15 1983-09-13 Electric Power Research Institute, Inc. Surge arrester having a non-fragmenting outer housing
CH659909A5 (en) * 1982-11-09 1987-02-27 Bbc Brown Boveri & Cie Method for producing an overvoltage suppressor
CH666574A5 (de) * 1984-06-01 1988-07-29 Bbc Brown Boveri & Cie Ueberspannungsableiter.
US4656555A (en) * 1984-12-14 1987-04-07 Harvey Hubbell Incorporated Filament wrapped electrical assemblies and method of making same
DK173921B1 (da) * 1986-01-29 2002-02-18 Bowthorpe Ind Ltd Elektrisk overspændingsafledningsindretning, fremgangsmåde og apparat til fremstilling samt en anvendelse af en sådan indretning
FR2641423B1 (fr) * 1988-12-30 1991-05-24 Ferraz Dispositif parafoudre pour la protection des lignes electriques

Also Published As

Publication number Publication date
ATE105102T1 (de) 1994-05-15
DE69008510T2 (de) 1994-08-18
FR2641423A1 (fr) 1990-07-06
ES2051491T3 (es) 1994-06-16
FR2641423B1 (fr) 1991-05-24
DE69008510D1 (de) 1994-06-01
EP0443286A1 (de) 1991-08-28
DK0443286T3 (da) 1994-05-30

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