EP0851549A1 - Überspannungsableiter mit einem aus thermoplastischen Material hergestellten Gehäuse mit einer auswendigen geprägten Oberfläche - Google Patents

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

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Publication number
EP0851549A1
EP0851549A1 EP97403081A EP97403081A EP0851549A1 EP 0851549 A1 EP0851549 A1 EP 0851549A1 EP 97403081 A EP97403081 A EP 97403081A EP 97403081 A EP97403081 A EP 97403081A EP 0851549 A1 EP0851549 A1 EP 0851549A1
Authority
EP
European Patent Office
Prior art keywords
envelope
electrical components
armatures
casing
components
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
EP97403081A
Other languages
English (en)
French (fr)
Other versions
EP0851549B1 (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 surge arrester is intended to be connected to electrical equipment to derive the overcurrent pulses.
  • overcurrent pulses occur, for example, during strokes lightning.
  • the arrester derives the overcurrent pulse at the earth, thereby protecting the electrical equipment and circuit from damage or destruction.
  • the envelope surrounding the components electrical conductors is consisting of a winding of resin-impregnated glass fibers, the assembly being housed in an insulating casing made of elastomeric polymer waterproof severe weather.
  • surge arresters are likely to present failures and in in this case they may be subjected to large leakage currents producing high gas pressures inside the envelope which leads to the bursting of the arrester.
  • To limit or prevent this risk of bursting it is known to provide a winding of glass fibers leaving openings lateral venting of gases.
  • Such a construction known from the patent European No. 0335480, however, is relatively expensive to manufacture and a object of the invention is to provide a cheaper overvoltage diverter.
  • the subject of the invention is a surge arrester comprising two metal connection frames, a stack of components electric extending along a longitudinal axis between the two armatures, a envelope surrounding the electrical components and fittings so that maintain electrical contact between these components, characterized in that the envelope is made from a thermoplastic material molded on the electrical components and fittings.
  • the envelope has an embossed outer surface with recesses and bumps, the hollows corresponding to thinner areas of the envelope and serving to constitute lateral openings in the envelope for venting gas.
  • An overpressure of the gases inside the envelope therefore causes the rupture of the envelope at its thinner zones and therefore greater fragility, that is to say at the level of the recesses 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 moisture 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 casing, the outer surface of which has 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.
  • the thermoplastic material is molded on the outer surface of the assembly 5 constituted by 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 risks 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 thinner zones 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 ribs 9 with respect to 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 Before making the envelope in thermoplastic material, assembly 5 is heated in an oven to bring its temperature to approximately 80 ° C so as to decrease, when the plastic material hardens, stresses due to differential expansion.
  • the plastic material of the envelope fills the grooves 4 of the 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 box 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)
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 true EP0851549A1 (de) 1998-07-01
EP0851549B1 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 (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01209685A (ja) * 1988-02-17 1989-08-23 Otowa Denki Kogyo Kk 避雷器
EP0335480A2 (de) * 1988-03-31 1989-10-04 Hubbell Incorporated Elektrische Modulareinheiten mit Druckentlastung
FR2685533A1 (fr) * 1991-12-20 1993-06-25 Soule Sa Parafoudre comprenant une piece de contact perfectionnee.
EP0595376A2 (de) * 1989-04-18 1994-05-04 Cooper Industries, Inc. Betriebssicherer Überspannungsableiter

Family Cites Families (4)

* 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
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
US5128824A (en) * 1991-02-20 1992-07-07 Amerace Corporation Directionally vented underground distribution surge arrester

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01209685A (ja) * 1988-02-17 1989-08-23 Otowa Denki Kogyo Kk 避雷器
EP0335480A2 (de) * 1988-03-31 1989-10-04 Hubbell Incorporated Elektrische Modulareinheiten mit Druckentlastung
EP0595376A2 (de) * 1989-04-18 1994-05-04 Cooper Industries, Inc. Betriebssicherer Überspannungsableiter
FR2685533A1 (fr) * 1991-12-20 1993-06-25 Soule Sa Parafoudre comprenant une piece de contact perfectionnee.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 518 (E - 848) 20 November 1989 (1989-11-20) *

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
EP0851549B1 (de) 2003-03-26
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

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