EP0851549B1 - Überspannungsableiter mit einem aus thermoplastischen Material hergestellten Gehäuse mit einer äusseren geprägten Oberfläche - Google Patents

Überspannungsableiter mit einem aus thermoplastischen Material hergestellten Gehäuse mit einer äusseren geprägten Oberfläche Download PDF

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Publication number
EP0851549B1
EP0851549B1 EP97403081A EP97403081A EP0851549B1 EP 0851549 B1 EP0851549 B1 EP 0851549B1 EP 97403081 A EP97403081 A EP 97403081A EP 97403081 A EP97403081 A EP 97403081A EP 0851549 B1 EP0851549 B1 EP 0851549B1
Authority
EP
European Patent Office
Prior art keywords
envelope
electrical components
fittings
thermoplastic material
stack
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
EP97403081A
Other languages
English (en)
French (fr)
Other versions
EP0851549A1 (de
Inventor
René Joulie
Serge Tartier
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.)
Societe Europeenne dIsolateurs en Verre et Composite SEDIVER SA
Original Assignee
Societe Europeenne dIsolateurs en Verre et Composite SEDIVER 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 Societe Europeenne dIsolateurs en Verre et Composite SEDIVER SA filed Critical Societe Europeenne dIsolateurs en Verre et Composite SEDIVER SA
Publication of EP0851549A1 publication Critical patent/EP0851549A1/de
Application granted granted Critical
Publication of EP0851549B1 publication Critical patent/EP0851549B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01T1/15—Details of spark gaps for protection against excessive pressure
    • 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
    • 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

Definitions

  • the invention relates to a surge arrester or surge arrester comprising two metal connection frames, a stack of conductive electrical components extending along a longitudinal axis between the two fittings, an envelope surrounding the electrical components and reinforcements so as to maintain electrical contact between these components.
  • Such a surge arrester or lightning arrester is intended to be connected to electrical equipment to derive the overcurrent pulses. Of such overcurrent pulses occur, for example, during strokes lightning. When this occurs, the arrester derives the overcurrent pulse at the earth, thereby protecting the electrical equipment and circuit from damage or destruction.
  • U.S. Patent No. 3,018,406 describes a surge arrester having a casing in thermosetting material molded on components electric. To avoid inclusions of this material between the electrical components during molding, the electrical components are protected by two prefabricated half-shells.
  • the envelope surrounding the conductive electrical components is constituted by a winding of resin-impregnated glass fibers, the assembly being housed in an insulating casing made of weatherproof elastomeric polymer.
  • the overvoltage diverter according to the invention as defined by claim 1 remedies the drawbacks indicated above.
  • An overpressure of the gases inside the envelope therefore causes the rupture of the envelope at its thinner areas and therefore of greater brittleness, that is to say at the level of the hollows of the embossed surface, which allows the venting of gases through the openings thus created without risk bursting lightning arrester.
  • the dinghy according to the invention is of low cost over time reduced manufacturing.
  • the envelope of such a dinghy can be produced by molding by injection or compression of the thermoplastic material on the electrical components and metal fittings. It is free of inclusion air or humidity between the electrical components and the enclosure or between the envelope and the casing made of elastomeric polymer material which surrounds the envelope.
  • the use of thermoplastic material is particularly advantageous since this material has a very short cycle time.
  • the molding is making on a cold column (the electrical components in the mold being brought to a temperature of around 80 ° c while the thermoplastic material in the mold being at a melting temperature of about 270 ° c), this material thermoplastic, whose melting point is generally very narrow, tends to freeze very quickly on contact with electrical components and does not get in not between these components. So there is no need to protect electrical components by a film used to avoid the inclusion of material between electrical components.
  • Figure 1 very schematically shows an assembly comprising a stacking of varistor blocks between two armatures to constitute a insert.
  • Figure 2 shows very schematically the assembly of Figure 1 fitted with a thermoplastic envelope, the outer surface of which an embossed structure.
  • FIG. 3 shows very schematically the surge arrester according to the invention with its elastomeric polymer housing.
  • the surge arrester or surge arrester according to the invention includes a set of electrically conductive components in the event of overvoltage, for example cylindrical blocks of varistor 1, aligned in row along a longitudinal axis 2 and in contact with each other by their appropriate end faces. On each end face of the stack of varistor blocks is placed a metal connection frame 3.
  • Each frame 3 has an annular groove indicated by 4 which extends perpendicular to axis 2 and which has facets 4a, 4b, 4c giving in cross section to axis 2 a polygonal shape, for example hexagonal.
  • an envelope 6 surrounds the varistor blocks 1 and the reinforcements 3.
  • this envelope is made from a material thermoplastic and has an embossed outer surface with depressions 7 and bumps 8 and 9.
  • thermoplastic material is molded on the outer surface of assembly 5 consisting of the stack of varistors 1 and the armatures metal 3.
  • the casing 6 can be produced for example, by molding by injection of the thermoplastic material into an injection mold containing assembly 5 which avoids the risk of air or humidity inclusions between the varistor blocks and the envelope.
  • Envelope 6 can also be prefabricated to be in the form of a tube made of material thermoplastic. Assembly 5 is introduced into the prefabricated envelope which is then compression molded, in a compression mold, onto the assembly 5 so as to obtain recesses 7 corresponding to zones thinner envelope.
  • the envelope 6, at the level of these zones of thinner thickness is likely to rupture locally under significant gas pressure and side openings thus formed by rupture are used to vent the gas.
  • the bumps on the outer surface of the casing 6 define longitudinal ribs 8 and radial 9 with respect to the axis 2. These ribs serve to constitute reinforcements to ensure the mechanical strength and the rigidity of the insert constituted by the assembly 5 and the envelope 6.
  • assembly 5 is heated in an oven to bring its temperature to approximately 80 ° C so as to reduce, when the plastic material hardens, stresses due to differential expansion.
  • the plastic material of the envelope fills the grooves 4 of reinforcements 3 so that the envelope engaged in these grooves ensures contact between the varistor blocks and prevents, due to the presence of facets, a rotational movement of the reinforcements 3 around the axis 2.
  • This plastic material can advantageously be loaded with cut fiberglass or silica to increase its characteristics mechanical and self-extinguishing.
  • a material thermoplastic with a very narrow melting point for example, a polyamide, a polyoxymethylene or even a polyphthalamide, to make the envelope.
  • the envelope 6 of the insert is enclosed in a housing in elastomeric polymeric material 10 having annular fins.
  • This case is advantageously produced by injection of the elastomeric polymer material in an injection mold containing the insert.
  • This elastomeric polymer material comes to fill the recesses 7 of the surface of the envelope without risk of inclusion of gas or humidity between the casing 6 and the casing 10.
  • the outer surface of the envelope is prepared, for example sanded to be frosted and glued.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Cable Accessories (AREA)
  • Connector Housings Or Holding Contact Members (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Motor Or Generator Frames (AREA)

Claims (8)

  1. Überspannungsableiter umfassend zwei metallische Verbindungsarmaturen (3), einen Stapel elektrischer Komponenten (1) der sich entlang einer Längsachse (2) zwischen den zwei Armaturen erstreckt, ein Gehäuse (6), das die elektrischen Komponenten und die Armaturen derart umgibt, dass ein elektrischer Kontakt zwischen diesen Komponenten aufrechterhalten wird, wobei das Gehäuse auf die elektrischen Komponenten und die Armaturen geformt ist,
    dadurch gekennzeichnet, dass das Gehäuse hergestellt ist ausgehend von einem thermoplastischen Material und dass dieses Gehäuse eine geprägte äußere Oberfläche mit Vertiefungen (7) und Buckeln (8, 9) aufweist, wobei die Buckel Zonen mit schwächerer Dicke des Gehäuses entsprechen, die lokal unter einem bedeutenden Gasdruck brechen können, so dass sie nach dem Bruch seitliche Öffnungen in dem Gehäuse für die Freisetzung von Gas bilden.
  2. Ableiter nach Anspruch 1, bei dem jede metallische Armatur (3) eine ringförmige Rille (4) mit Facetten (4a, 4b, 4c) aufweist, in der sich das Gehäuse abstützt.
  3. Ableiter nach einem der Ansprüche 1 bis 2, bei dem die Buckel der geprägten äußeren Oberfläche des Gehäuses (6) gegenüber der Achse (2) längs (8) und radial (9) verlaufende Maserungen bilden.
  4. Ableiter nach einem der Ansprüche 1 bis 3, umfassend ein das Gehäuse umgebendes Gefäß (10) aus Elastomer-Polymermaterial, wobei dieses Polymermaterial die Vertiefungen (7) der äußeren Oberfläche des Gehäuses ausfüllt.
  5. Verfahren zur Herstellung eines Ableiters nach irgendeinem der Ansprüche 1 bis 4, bei dem das Gehäuse geformt wird auf die elektrischen Komponenten (1) und die metallischen Armaturen (3) durch Injektion von thermoplastischem Material in eine Form, die den Stapel elektrischer Komponenten (1) zwischen den beiden Armaturen (3) hält, wobei dieser Stapel von elektrischen Komponenten einer Kompressionskraft (F) ausgesetzt wird, die entsprechend der Längsachse (2) während des Injizierens des thermoplastischen Materials ausgeübt wird.
  6. Verfahren zur Herstellung eines Überspannungsableiters nach einem beliebigen der Ansprüche 1 bis 4, bei dem das Gehäuse geformt wird auf die elektrischen Komponenten (1) und die metallischen Armaturen (3) durch Kompression des thermoplastischen Materials in einer Form, die den Stapel elektrischer Komponenten (1) zwischen den zwei Armaturen (3) hält, wobei dieser Stapel von elektrischen Komponenten einer Kompressionskraft (F) ausgesetzt wird, die entlang der Längsachse (2) während der Kompression des thermoplastischen Materials ausgeübt wird.
  7. Verfahren nach einem der Ansprüche 5 oder 6, bei dem der Stapel von elektrischen Komponenten (1) zwischen den zwei Armaturen (3) zunächst vor dem Formen des thermoplastischen Materials auf die elektrischen Komponenten und die Armaturen aufgeheizt wird.
  8. Verfahren nach Anspruch 7, bei dem ein Gefäß aus Elastomer-Polymermaterial (10) durch Injektion um das Gehäuse (6) geformt wird, wobei das Elastomer-Polymermaterial die Vertiefungen (7) der äußeren Oberfläche des Gehäuses ausfüllt.
EP97403081A 1996-12-23 1997-12-18 Überspannungsableiter mit einem aus thermoplastischen Material hergestellten Gehäuse mit einer äusseren geprägten Oberfläche Expired - Lifetime EP0851549B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9615852A FR2757693B1 (fr) 1996-12-23 1996-12-23 Parafoudre avec une enveloppe ayant une surface exterieure gaufree
FR9615852 1996-12-23

Publications (2)

Publication Number Publication Date
EP0851549A1 EP0851549A1 (de) 1998-07-01
EP0851549B1 true EP0851549B1 (de) 2003-03-26

Family

ID=9499001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97403081A Expired - Lifetime EP0851549B1 (de) 1996-12-23 1997-12-18 Überspannungsableiter mit einem aus thermoplastischen Material hergestellten Gehäuse mit einer äusseren geprägten Oberfläche

Country Status (11)

Country Link
US (1) US5875090A (de)
EP (1) EP0851549B1 (de)
CN (1) CN1111877C (de)
AT (1) ATE235754T1 (de)
BR (1) BR9706425B1 (de)
CA (1) CA2225625C (de)
DE (1) DE69720169T2 (de)
DK (1) DK0851549T3 (de)
ES (1) ES2192660T3 (de)
FR (1) FR2757693B1 (de)
ZA (1) ZA9711512B (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6625280B1 (en) 1999-11-01 2003-09-23 Avaya Technology Corp. Balanced heat coil protector
SG105003A1 (en) * 2002-04-15 2004-07-30 Andrew Corp Surge lightning protection device
ITPD20030228A1 (it) * 2003-10-01 2005-04-02 Comem Spa Struttura di scaricatore di sovratensione
DE102005007146A1 (de) * 2005-02-11 2006-08-24 Siemens Ag Verfahren zur Ummantelung eines Varistorblockes mit einer elektrisch isolierenden Umhüllung sowie Varistorblock für einen Überspannungsableiter
EP2998970B1 (de) * 2014-09-22 2017-08-02 Siemens Aktiengesellschaft Überspannungsableiter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3018406A (en) * 1958-07-17 1962-01-23 Westinghouse Electric Corp Lightning arrester

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2647893B2 (ja) * 1987-03-06 1997-08-27 セラヴェール 避雷器を製造する方法
SE459294B (sv) * 1987-10-26 1989-06-19 Asea Ab Ventilavledare
JP3012884B2 (ja) * 1988-02-17 2000-02-28 音羽電機工業株式会社 避雷器
CA1334990C (en) * 1988-03-31 1995-03-28 John D. Sakich Modular electrical assemblies with pressure relief
US4930039A (en) * 1989-04-18 1990-05-29 Cooper Industries, Inc. Fail-safe surge arrester
US5128824A (en) * 1991-02-20 1992-07-07 Amerace Corporation Directionally vented underground distribution surge arrester
FR2685533B1 (fr) * 1991-12-20 1994-04-01 Soule Parafoudre comprenant une piece de contact perfectionnee.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3018406A (en) * 1958-07-17 1962-01-23 Westinghouse Electric Corp Lightning arrester

Also Published As

Publication number Publication date
FR2757693A1 (fr) 1998-06-26
US5875090A (en) 1999-02-23
ZA9711512B (en) 1999-06-22
CN1111877C (zh) 2003-06-18
CA2225625A1 (fr) 1998-06-23
CA2225625C (fr) 2007-03-20
ATE235754T1 (de) 2003-04-15
MX9710348A (es) 1998-08-30
ES2192660T3 (es) 2003-10-16
CN1194443A (zh) 1998-09-30
DE69720169T2 (de) 2004-01-15
DE69720169D1 (de) 2003-04-30
BR9706425A (pt) 1999-05-25
FR2757693B1 (fr) 1999-02-19
BR9706425B1 (pt) 2011-05-31
DK0851549T3 (da) 2003-07-21
EP0851549A1 (de) 1998-07-01

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