EP0689727B1 - Limiteur de haute tension avec dispositif de court circuit - Google Patents

Limiteur de haute tension avec dispositif de court circuit Download PDF

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Publication number
EP0689727B1
EP0689727B1 EP94908274A EP94908274A EP0689727B1 EP 0689727 B1 EP0689727 B1 EP 0689727B1 EP 94908274 A EP94908274 A EP 94908274A EP 94908274 A EP94908274 A EP 94908274A EP 0689727 B1 EP0689727 B1 EP 0689727B1
Authority
EP
European Patent Office
Prior art keywords
spring clip
connection wire
electrode
middle electrode
tabs
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
EP94908274A
Other languages
German (de)
English (en)
Other versions
EP0689727A1 (fr
Inventor
Gerhard Lange
Thomas Westebbe
Michael Bluhm
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE9421824U priority Critical patent/DE9421824U1/de
Publication of EP0689727A1 publication Critical patent/EP0689727A1/fr
Application granted granted Critical
Publication of EP0689727B1 publication Critical patent/EP0689727B1/fr
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
    • H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure

Definitions

  • the invention is in the field of electrical components and can be used in the structural design of a gas-filled three-electrode surge arrester which is provided with an external short-circuiting device.
  • a short-circuit device serves to protect the surge arrester from long-term loads;
  • Such a short-circuit device generally contains a structural element which can be melted at higher temperatures and by means of which the central electrode and one or both end electrodes are short-circuited.
  • the outer short-circuit device consists of a two-armed and roof-like arched spring clip extending in the axial direction of the surge arrester, the arms of which enclose an obtuse angle between them and rest with their free ends with the interposition of a fusible insulating layer on the end electrodes.
  • the outermost ends of the two arms are slightly angled so that these ends run parallel to the axis of the surge arrester and consequently rest on the outer peripheral surface of the end electrodes.
  • the spring clip is provided in its center with an opening with which it is attached to the radially projecting connecting wire of the center electrode. In this way, the spring clip can be fixed to the connecting wire with pre-tension (FR-A-2625 377).
  • a two-armed spring clip is attached centrally to the center electrode.
  • the two free ends of the arms of this spring clip are isolated on the circumference of the end electrodes.
  • the surge arrester serves as a surge arrester both for the design of a short-circuit device and for the design of parallel air spark gaps.
  • an approximately 20 to 40 ⁇ m thick insulating layer made of, for example, polyurethane lacquer is applied to the ends of the two arms of the spring clip.
  • the central part of the spring clip is connected to the radially projecting connecting wire of the central electrode (US Pat. No. 4,912,592).
  • a spring clip is also provided as an external short-circuit device.
  • the arms of the spring clip protrude in the axial direction from the end electrodes of the arrester and their ends lie on the end electrodes with the interposition of an insulating film on the end face, that is to say axially.
  • this is provided in the middle with an opening in the form of an H-shaped punching, between the tabs of which the connecting wire of the center electrode is guided.
  • the spring clip is fixed to the connecting wire in the prestressed state by means of the resilient tabs (WO 90/13904).
  • the invention has for its object to choose the structural design of the spring clip so that it ensures reliable contact with the end electrodes.
  • the free ends of the arms of the spring clip axially protrude beyond the end electrodes and each rest on the peripheral edge of the respective end electrode.
  • the arms of the spring clip are set with a sufficiently large pretension punctiform on the end electrodes; this is when the insulating layer melts ensures safe contact.
  • the safety for a point-like seating can be increased in that two tabs abutting the peripheral edge of the respective end electrode are formed at the ends of the arms of the spring clip.
  • This also provides an anti-twist device for the spring clip.
  • Such a configuration of the spring clip is particularly suitable for those arresters in which the connecting wires of all electrodes run radially in the same direction.
  • the curvature of the spring clip is appropriately selected so that the arms enclose an obtuse angle of about 110-150 ° between them in the untensioned state.
  • the spring clip can be fixed to the center electrode or to its connecting wire or connecting pin in a simple manner in a material or, in particular, form-fitting manner.
  • the fixation also occurs with the aid of an on the connecting wire of the central electrode pushed-on crimp socket into consideration.
  • the spring clip is also provided with a bore in the area of the curvature and is fixed in the pretensioned state by means of the crimp bush.
  • the spring clip in the region of its curvature to form two resilient tabs with an H-shaped punching, the distance between the two tabs being smaller than the diameter of the connecting wire of the center electrode, and the spring clip using these tabs on the Clamp the connecting wire in the pretensioned state.
  • a plastic drop can be used to prevent rotation of the spring clip or a drop of soft solder is placed on one or both tabs at the point of contact with the lead wire.
  • the surge arrester according to Figures 1 and 2 consists in a known manner of the two end electrodes 1 and 2, the central electrode 3 and the two ceramic insulating bodies 4 and 5, which keep the electrodes at a distance.
  • the connecting wire 6, which protrudes radially upward, is welded to the center electrode.
  • the connecting wires 7 and 8 are welded to the side of the two end electrodes 4 and 5 and run radially downward.
  • the surge arrester is further provided with an external short-circuit device, which consists of the spring clip 20 and an insulating film 21 arranged between the spring clip and the end electrodes 1 and 2.
  • a metal strip 20 is used to form the spring clip 20, which is provided with a centrally arranged, H-shaped symmetrical opening or punching 21A. By means of this punch-out, tabs 22 and 23 are formed, the spacing A of which is smaller than the diameter D of the connecting wire 6 of the center electrode.
  • the sheet metal strip 20 according to Figure 3 is bent according to Figure 4 to form the spring clip such that a roof-shaped curvature 24 is formed.
  • the two arms 25 and 26 of the spring clip enclose an angle alpha of approximately 120 °.
  • the tabs 22 and 23 are elastically bent out of their rest position.
  • the edges of the tabs dig into the surface of the connecting wire 6, as a result of which the spring clip is fixed in a specific position in which the ends of the arms 25, 26 are under a prestress.
  • the amount of preload depends on how far the spring clip is pressed with its curvature in the direction of the center electrode. - In the desired position, the spring clip can be secured against rotation by a soft solder drop or a plastic drop that is applied at the point of contact of the tabs with the connecting wire.
  • the connecting wire 6 for the center electrode and the connecting wires 9 and 10 for the end electrodes run radially in the same direction. So that in this case the spring belt 27 does not touch the connecting wires 9 and 10, its ends are provided with a cutout, as shown in FIG. 6. As a result, two tabs 28 and 29 are formed, which on the circumferential edge of the respective end electrode 1, 2 point to point. This configuration also represents an anti-rotation device.
  • FIG. 7 shows the fixing of a spring clip 30 to the connecting wire 6 by means of a crimp bushing 31, the spring clip being provided with a bore in the region of its curvature.

Landscapes

  • Thermistors And Varistors (AREA)
  • Fuses (AREA)

Abstract

Dans un parasurtension à trois électrodes dont l'électrode centrale (3) est pourvue d'un fil de connexion (6) radialement saillant et qui est pourvu d'un court-circuiteur extérieur, le court-circuiteur est constitué par un étrier élastique (20) à deux bras dont les bras s'étendent au-delà des extrémités libres des électrodes terminales dans le sens axial et reposent sur la périphérie de l'électrode terminale correspondante (1, 2), une feuille isolante (21) étant située entre l'arête périphérique des électrodes et les bras de l'étrier élastique. L'étrier élastique (20) présente une courbure (24) en forme de toit et est pourvu dans la zone de cette courbure d'un passage qui sert à fixer l'étrier élastique au fil de connexion (6) de l'électrode centrale (3).

Claims (6)

  1. Parasurtension rempli de gaz, comportant deux électrodes (1, 2) d'extrémité cylindriques, qui se font face axialement, une électrode (3) centrale annulaire et deux éléments (4, 5) isolants cylindriques creux, disposés entre les électrodes, ainsi qu'un dispositif de court-circuit extérieur, fixé à l'électrode centrale, en forme d'un étrier (20, 27, 30) élastique à deux bras, qui s'étend dans la direction axiale, qui est cintré en forme de toit et dont les bras (25, 26) font un angle obtus l'un avec l'autre et s'appliquent par leurs extrémités libres aux électrodes d'extrémité avec interposition d'une couche (21) isolante, l'électrode centrale étant munie d'un fil (6) métallique de raccordement radialement en saillie, et l'étrier (20) élastique comportant au centre une découpe (21A), par laquelle passe le fil (6) métallique de raccordement de l'électrode (3) centrale, si bien que, lorsqu'il est précontraint, l'étrier (20) élastique est immobilisé sur le fil (3) métallique de raccordement, caractérisé en ce que les extrémités libres (25, 26) des bras de l'étrier (20) élastique font saillie axialement des électrodes (1, 2) d'extrémité et s'appliquent au bord périphérique de l'électrode (1, 2) d'extrémité associée.
  2. Parasurtension suivant la revendication 1, caractérisé en ce qu'il est formé à chacune des extrémités de l'étrier (27) élastique deux pattes (28, 29) s'appliquant au bord périphérique de l'électrode d'extrémité associée (cf. figure 6).
  3. Parasurtension suivant la revendication 1 et 2, caractérisé en ce que l'étrier (30) élastique est muni dans la zone du cintrage d'un perçage et immobilisé en l'état précontraint au moyen d'une douille (31) de serrage enfilée sur le fil (6) métallique de raccordement de l'électrode centrale (cf. figure 7).
  4. Parasurtension suivant la revendication 1 ou 2, caractérisé en ce que l'étrier élastique est muni dans la zone du cintrage d'un perçage dont le diamètre correspond au diamètre du fil (6) métallique de raccordement et, en l'état précontraint, immobilisé sur le fil (6) métallique de raccordement de l'électrode centrale au moyen d'une brasure tendre.
  5. Parasurtension suivant la revendication 1 ou 2, caractérisé en ce que l'étrier (20) élastique est muni dans la zone de son cintrage (24), pour former deux languettes (22, 23) élastiques, d'une découpe (21A) en forme de H, la distance (A) des deux languettes étant inférieure au diamètre (D) du fil (6) métallique de raccordement de l'électrode (3) centrale, et en ce que, à l'état précontraint, l'étrier (20) élastique est bloqué sur le fil (6) métallique de raccordement au moyen de ces languettes (22, 23) et les languettes (22, 23) sont immobilisées sur le fil (6) métallique de raccordement par joint intégré.
  6. Parasurtension suivant l'une des revendications 1 à 5, caractérisé en ce que la couche isolante interposée entre l'étrier (20) élastique et les électrodes (1, 2) d'extrémité est une feuille (21) isolante.
EP94908274A 1993-03-17 1994-02-25 Limiteur de haute tension avec dispositif de court circuit Expired - Lifetime EP0689727B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE9421824U DE9421824U1 (de) 1993-03-17 1994-02-25 Überspannungsableiter mit äußerer Kurzschlußeinrichtung

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4309331A DE4309331A1 (de) 1993-03-17 1993-03-17 Überspannungsableiter mit äußerer Kurzschlußeinrichtung
DE4309331 1993-03-17
PCT/DE1994/000217 WO1994022191A1 (fr) 1993-03-17 1994-02-25 Parasurtension a court-circuiteur exterieur

Publications (2)

Publication Number Publication Date
EP0689727A1 EP0689727A1 (fr) 1996-01-03
EP0689727B1 true EP0689727B1 (fr) 1997-07-09

Family

ID=6483576

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94908274A Expired - Lifetime EP0689727B1 (fr) 1993-03-17 1994-02-25 Limiteur de haute tension avec dispositif de court circuit

Country Status (6)

Country Link
US (1) US5644465A (fr)
EP (1) EP0689727B1 (fr)
CN (1) CN1042878C (fr)
DE (2) DE4309331A1 (fr)
ES (1) ES2105657T3 (fr)
WO (1) WO1994022191A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19622461B4 (de) * 1996-05-24 2005-04-21 Epcos Ag Gasgefüllter Überspannungsableiter mit äußerer Kurzschlußeinrichtung
DE19708651A1 (de) * 1997-02-21 1998-09-03 Siemens Ag Gasgefüllter Überspannungsableiter mit äußerer Kurzschlußeinrichtung
ES2360884T3 (es) * 2005-09-23 2011-06-10 EBERSPÄCHER CATEM GMBH & CO. KG Elemento generador de calor de un dispositivo de calefacción.
US7974063B2 (en) * 2007-11-16 2011-07-05 Corning Cable Systems, Llc Hybrid surge protector for a network interface device
DE102008062491A1 (de) * 2008-12-16 2010-06-17 Epcos Ag Überspannungsableiter mit einer Kurzschlusseinrichtung

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IN170586B (fr) * 1987-01-07 1992-04-18 Samhwa Electric Ind Co
GB2205992B (en) * 1987-05-01 1991-07-17 Dubilier Plc Gas-filled surge arrestor
FR2625377A1 (fr) * 1987-12-23 1989-06-30 Pendar Sarl Parafoudre de surete
JPH0227694U (fr) * 1988-08-10 1990-02-22
GB2230900A (en) * 1989-04-24 1990-10-31 Semitron Cricklade Ltd Electrical components
US5027100A (en) * 1990-02-12 1991-06-25 Porta Systems Corp. Gas tube fail safe device for telephone protector modules
MX172972B (es) * 1989-05-01 1994-01-26 Porta Systems Corp Dispositivo de autoajuste de fallas en el tubo de gas para modulos protectores de telefonos
US4910489A (en) * 1989-05-01 1990-03-20 Porta Systems Corp. Gas tube fail-safe device for telephone protector modules
US5029302A (en) * 1990-08-29 1991-07-02 Illinois Tool Works Fail safe gas tube

Also Published As

Publication number Publication date
DE59403317D1 (de) 1997-08-14
WO1994022191A1 (fr) 1994-09-29
ES2105657T3 (es) 1997-10-16
CN1121378A (zh) 1996-04-24
CN1042878C (zh) 1999-04-07
US5644465A (en) 1997-07-01
DE4309331A1 (de) 1994-09-22
EP0689727A1 (fr) 1996-01-03

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