EP0445054B1 - Lightning arrestor device for the protection of electric lines - Google Patents
Lightning arrestor device for the protection of electric lines Download PDFInfo
- Publication number
- EP0445054B1 EP0445054B1 EP91420071A EP91420071A EP0445054B1 EP 0445054 B1 EP0445054 B1 EP 0445054B1 EP 91420071 A EP91420071 A EP 91420071A EP 91420071 A EP91420071 A EP 91420071A EP 0445054 B1 EP0445054 B1 EP 0445054B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intermediary
- stack
- varistors
- glue
- elements
- 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
Links
- 230000001681 protective effect Effects 0.000 claims abstract description 6
- 239000003292 glue Substances 0.000 claims description 8
- 229920002994 synthetic fiber Polymers 0.000 claims description 4
- 239000000470 constituent Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000000806 elastomer Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 239000004411 aluminium Substances 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 239000000853 adhesive Substances 0.000 abstract description 6
- 230000001070 adhesive effect Effects 0.000 abstract description 6
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
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
- H01T4/00—Overvoltage arresters using spark gaps
- H01T4/16—Overvoltage arresters using spark gaps having a plurality of gaps arranged in series
-
- 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 insulating element disposed between the two capsules or terminal connection electrodes is constituted by a stack of varistors based on zinc oxide (Zn0) maintained under axial pressure.
- this stack and the elastic pressure means are contained inside a rigid tube made of an insulating material, itself sheathed by a plastic envelope, the assembly formed by said tube and envelope giving the aforementioned stacking the mechanical strength and sealing necessary for the practical use of the device.
- the invention consists in placing between the facing faces of the constituent elements (varistors and electrodes) of the insulation stack, intermediate parts with corrugated profile which by crushing provide the electrical connection and which are profiled to provide free areas suitable for receiving the layer of glue necessary for the mutual assembly of the aforementioned elements.
- Fig. 1 is a schematic axial section of a lightning arrester device established in accordance with the present invention.
- Fig. 2 is a perspective view illustrating a first embodiment of the invention, the parts being shown before assembly.
- Fig. 3 is a vertical section showing the parts after assembly by pressing and gluing.
- Fig. 4 and 5 respectively 6 and 7, similarly represent two alternative embodiments.
- Fig. 8 to 11 illustrate a second embodiment of the invention.
- the device shown in fig. 1 essentially comprises an insulating element formed by the rigid and resistant assembly of a stack of varistors 1 maintained under pressure between two terminal connection electrodes 2, which element 1-2 is covered in a sealed manner by an insulating envelope 3 which with annular projections 3a is directly obtained by overmoulding a synthetic material on said member.
- the mode of implementation shown in fig. 2 and 3 uses a spacer 4 formed by a washer with a corrugated profile, the outside diameter of which is slightly smaller than that of each of the varistors 1. On the transverse face of each of these, a layer of glue 5 in the form of a disc, the diameter of which is less than the inside diameter of the corrugated washer 4.
- each adhesive disc 5 is lined with an adhesive ring 50 which surrounds the washer 4.
- the adhesive layer 5 is in the form of two rigid pads which occupy the opening of the corrugated washer 4 and which cooperate with an intermediate disc 6, capable of being made either of an elastomer or of aluminum .
- This central disc 6 is intended to improve, by crushing, the elastic pressure effect exerted on the varistors 1.
- FIG. 8 to 11 Illustrated in fig. 8 to 11 another embodiment of the invention, according to which the intermediate piece provided between the faces facing the varistors 1 is constituted by an insert 40 comprising a central part integral with radial branches (in number four in the example considered), each of these branches having a wavy profile.
- Fig. 10 shows the assembly obtained after axial pressure and crushing of the corrugated profile of the insert 40. It was further assumed that the bonding was here ensured by the synthetic material which is overmolded on the insulating body of the arrester for the realization of the outer casing 3, which material is introduced at 30 between the branches of the insert 40.
- the shape of the intermediate piece 4 or 40 can vary to a large extent, provided that this piece, due to the elastic deformability of its constituent material and having regard to its initial profile, is capable of collapsing during bonding to guarantee a good connection and that said conformation ensures the distribution of the mechanical assembly and electrical connection zones.
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
- Insulated Conductors (AREA)
- Filters And Equalizers (AREA)
- Non-Insulated Conductors (AREA)
Abstract
Description
La présente invention a trait aux dispositifs parafoudres destinés à la protection des lignes électriques, tout particulièrement des lignes aériennes à moyenne tension.The present invention relates to surge protective devices intended for the protection of power lines, in particular of medium voltage overhead lines.
On connaît des dispositifs de ce genre dans lesquels l'élément d'isolation disposé entre les deux capsules ou électrodes terminales de connexion est constitué par un empilage de varistances à base d'oxyde de zinc (Zn0) maintenues sous pression axiale. Dans les constructions connues, cet empilage et les moyens de pression élastique sont contenus à l'intérieur d'un tube rigide en une matière isolante, lui même gainé par une enveloppe en matière synthétique, l'ensemble formé par lesdits tube et enveloppe conférant à l'empilage précité la résistance mécanique et l'étanchéité nécessaires à l'utilisation pratique du dispositif.Devices of this type are known in which the insulating element disposed between the two capsules or terminal connection electrodes is constituted by a stack of varistors based on zinc oxide (Zn0) maintained under axial pressure. In known constructions, this stack and the elastic pressure means are contained inside a rigid tube made of an insulating material, itself sheathed by a plastic envelope, the assembly formed by said tube and envelope giving the aforementioned stacking the mechanical strength and sealing necessary for the practical use of the device.
Il va de soi que la présence du tube rigide et des moyens élastiques de pression complique et renchérit la fabrication des dispositifs parafoudres. Aussi a-t-on songé à se dispenser d'eux en opérant l'assemblage mécanique direct des varistances et des électrodes terminales, l'ensemble rigide ainsi obtenu étant alors simplement gainé dans une enveloppe isolante de protection. Un tel assemblage peut en principe être opéré par collage, mais il faut évidemment avoir recours à une colle de nature conductrice afin de permettre le passage du courant dans l'empilage ; or les essais ont démontré que les colles conductrices vieillissaient très mal, au point qu'un bon nombre des parafoudres ainsi réalisés perdaient rapidement leur efficacité.It goes without saying that the presence of the rigid tube and of the elastic pressure means complicates and increases the cost of manufacturing the surge protective devices. We have therefore thought of dispensing with them by operating the direct mechanical assembly of the varistors and the terminal electrodes, the rigid assembly thus obtained then being simply sheathed in an insulating protective envelope. Such an assembly can in principle be carried out by bonding, but it is obviously necessary to use an adhesive of a conductive nature in order to allow the passage of current in the stack; However, tests have shown that conductive adhesives age very badly, to the point that many of the surge arresters thus produced quickly lose their effectiveness.
C'est à cet inconvénient qu'entend remédier la présente invention, laquelle a pour objet le dispositif parafoudre défini à la revendication 1.It is to this drawback that the present invention intends to remedy, which relates to the arrester device defined in
En fait l'invention consiste à disposer entre les faces en vis-à-vis des éléments constitutifs (varistances et électrodes) de l'empilage d'isolation, des pièces intermédiaires à profil ondulé qui assurent par écrasement la connexion électrique et qui sont profilées pour ménager des zones libres propres à recevoir la couche de colle nécessaire à l'assemblage mutuel des éléments précités.In fact, the invention consists in placing between the facing faces of the constituent elements (varistors and electrodes) of the insulation stack, intermediate parts with corrugated profile which by crushing provide the electrical connection and which are profiled to provide free areas suitable for receiving the layer of glue necessary for the mutual assembly of the aforementioned elements.
On conçoit qu'on se dispense ainsi de toute colle conductrice et qu'on puisse avoir recours à n'importe quelle substance adhésive, au point que le collage peut en certains cas être assuré par la matière synthétique qui est surmoulée sur l'empilage d'isolation pour constituer l'enveloppe étanche de protection.It is understood that one thus dispenses with any conductive glue and that one can have recourse to any adhesive substance, to the point that bonding can in certain cases be ensured by the synthetic material which is overmolded on the insulation stack to constitute the waterproof protective 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 appended drawing, given by way of example, will allow a better understanding of the invention, the characteristics which it presents and the advantages which it is capable of providing:
Fig. 1 est une coupe axiale schématique d'un dispositif parafoudre établi conformément à la présente invention.Fig. 1 is a schematic axial section of a lightning arrester device established in accordance with the present invention.
Fig. 2 est une vue en perspective illustrant un premier mode de mise en oeuvre de l'invention, les pièces étant représentées avant assemblage.Fig. 2 is a perspective view illustrating a first embodiment of the invention, the parts being shown before assembly.
Fig. 3 est une coupe verticale montrant les pièces après assemblage par pression et collage.Fig. 3 is a vertical section showing the parts after assembly by pressing and gluing.
Fig. 4 et 5, respectivement 6 et 7, représentent de manière semblable deux variantes de réalisation.Fig. 4 and 5, respectively 6 and 7, similarly represent two alternative embodiments.
Fig. 8 à 11 illustrent un second mode de mise en oeuvre de l'invention.Fig. 8 to 11 illustrate a second embodiment of the invention.
Le dispositif représenté en fig. 1 comprend essentiellement un élément d'isolation formé par l'assemblage rigide et résistant d'un empilage de varistances 1 maintenues sous pression entre deux électrodes terminales de connexion 2, lequel élément 1-2 est recouvert de manière étanche par une enveloppe isolante 3 qui avec ses saillies annulaires 3a est directement obtenue par surmoulage d'une matière synthétique sur ledit élément.The device shown in fig. 1 essentially comprises an insulating element formed by the rigid and resistant assembly of a stack of
Il convient ici d'observer que si dans les développements qui vont suivre, le mode d'assemblage suivant l'invention a été décrit et illustré comme intéressant deux varistances 1 superposées, les explications doivent être considérées comme valables en ce qui concerne l'assemblage de chacune des électrodes 2 avec la varistance 1 d'extrémité.It should be noted here that if in the following developments, the assembly method according to the invention has been described and illustrated as interesting two
Le mode de mise en oeuvre représenté en fig. 2 et 3 fait appel à une pièce intercalaire 4 formée par une rondelle à profil ondulé dont le diamètre extérieur est légèrement inférieur à celui de chacune des varistances 1. Sur la face transversale de chacune de celles-ci on a déposé, par exemple par un procédé de sérigraphie, une couche de colle 5 sous la forme d'un disque dont le diamètre est inférieur au diamètre intérieur de la rondelle ondulée 4.The mode of implementation shown in fig. 2 and 3 uses a
On conçoit que si on applique une pression axiale sur les deux varistances 1 superposées avec interposition de la rondelle 4, on obtient l'assemblage montré en fig. 3 et l'on peut constater que la rondelle 4 se trouve écrasée entre les deux varistances 1, liées l'une à l'autre par la colle provenant des disques 5. La connexion électrique est assurée dans de très bonnes conditions par la rondelle 4 à l'état écrasé, tandis que le collage en 5 permet l'obtention d'un ensemble rigide et résistant.It is understood that if an axial pressure is applied to the two
La variante suivant fig. 4 et 5 ne se distingue de la forme de réalisation qui précède qu'en ce que chaque disque de colle 5 est doublé par un anneau de colle 50 qui entoure la rondelle 4.The variant according to fig. 4 and 5 is distinguished from the above embodiment only in that each
Dans la variante suivant fig. 6 et 7, la couche de colle 5 se présente sous la forme de deux pastilles rigides qui occupent l'ouverture de la rondelle ondulée 4 et qui coopèrent avec un disque intermédiaire 6, susceptible d'être réalisé soit en un élastomère, soit en aluminium. Ce disque central 6 est destiné à améliorer, par écrasement, l'effet de pression élastique exercé sur les varistances 1.In the variant according to fig. 6 and 7, the
On a illustré en fig. 8 à 11 un autre mode de mise en oeuvre de l'invention, suivant lequel la pièce intercalaire prévue entre les faces en vis-à-vis des varistances 1 est constitué par un insert 40 conprenant une partie centrale solidaire de branches radiales (au nombre de quatre dans l'exemple considéré), chacune de ces branches présentant un profil ondulé. Fig. 10 montre l'assemblage obtenu après pression axiale et écrasement du profil ondulé de l'insert 40. On a en outre supposé que le collage était ici assuré par la matière synthétique qui est surmoulée sur le corps isolant du parafoudre pour la réalisation de l'enveloppe extérieure 3, laquelle matière s'introduit en 30 entre les branches de l'insert 40.Illustrated in fig. 8 to 11 another embodiment of the invention, according to which the intermediate piece provided between the faces facing the
Il va de soi que la conformation de la pièce intercalaire 4 ou 40 peut varier dans une large mesure, pour autant que cette pièce, de par la déformabilité élastique de sa matière constitutive et eu égard à son profil initial, soit propre à s'écraser lors du collage pour garantir une bonne connexion et que ladite conformation assure bien la répartition des zones d'assemblage mécanique et de connexion électrique.It goes without saying that the shape of the
Claims (7)
- A lightning arrester device for protecting electrical lines, in particular medium-voltage overhead lines, of the type comprising a stack which is formed by varistors (1) and terminal electrodes (2) kept under axial pressure and which is located within a hermetic protective sheath (3), characterised in that an intermediary (4, 40) is provided between the constituent parts of the stack (1-2), which intermediary has elastic deformability to compression, thus maintaining the quality of the electrical connection between the adjacent elements, and which is profiled to produce free zones suitable for receiving, between said elements, a layer of glue (5, 50, 30) mechanically assembling said elements.
- A device according to Claim 1, characterised in that the intermediary is formed by a washer (4).
- A device according to Claim 1, characterised in that the intermediary is formed by an insert (40) having a solid central part and a series of radial branches of undulating profile.
- A device according to any one of Claims 1 to 2, characterised in that the assembly glue is in the form of a disc (5) which occupies the central zone of the transverse end faces of the varistors (1) and the electrodes (2).
- A device according to any one of Claims 1 to 3, characterised in that the assembly glue is in the form of a ring (50) arranged around the intermediary (4, 40).
- A device according to any one of Claims 1 to 3, characterised in that the glue is formed by the layer (30) of the synthetic material which forms the sheath (3), directly moulded on to the stack (1-2).
- A device according to any one of Claims 1, 2, 4, 5 and 6, characterised in that an intermediate disc (6) made of elastomer or aluminium, suitable for improving by compression the effect of elastic pressure exerted on the stack (1-2) is associated with the intermediary (4, 40).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9002897 | 1990-03-02 | ||
| FR9002897A FR2659169B1 (en) | 1990-03-02 | 1990-03-02 | SURGE PROTECTION DEVICE FOR THE PROTECTION OF ELECTRICAL LINES. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0445054A1 EP0445054A1 (en) | 1991-09-04 |
| EP0445054B1 true EP0445054B1 (en) | 1994-12-14 |
Family
ID=9394483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91420071A Expired - Lifetime EP0445054B1 (en) | 1990-03-02 | 1991-03-01 | Lightning arrestor device for the protection of electric lines |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0445054B1 (en) |
| AT (1) | ATE115762T1 (en) |
| CA (1) | CA2037115A1 (en) |
| DE (1) | DE69105779T2 (en) |
| DK (1) | DK0445054T3 (en) |
| ES (1) | ES2065653T3 (en) |
| FR (1) | FR2659169B1 (en) |
| TR (1) | TR25323A (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH682858A5 (en) * | 1991-12-04 | 1993-11-30 | Asea Brown Boveri | Surge arresters. |
| DE4306691A1 (en) * | 1993-03-04 | 1994-11-03 | Abb Management Ag | Surge arresters |
| US6430020B1 (en) * | 1998-09-21 | 2002-08-06 | Tyco Electronics Corporation | Overvoltage protection device including wafer of varistor material |
| DE29912703U1 (en) * | 1999-07-19 | 1999-11-11 | Siemens AG, 80333 München | Surge arresters |
| ES2166689B1 (en) * | 2000-01-26 | 2003-10-16 | Ind De Aparellaje Electrico S | SURVEY DOWNLOADER. |
| US7433169B2 (en) | 2005-12-15 | 2008-10-07 | Raycap Corporation | Overvoltage protection devices including wafer of varistor material |
| US8743525B2 (en) | 2012-06-19 | 2014-06-03 | Raycap Intellectual Property, Ltd | Overvoltage protection devices including wafer of varistor material |
| US9906017B2 (en) | 2014-06-03 | 2018-02-27 | Ripd Research And Ip Development Ltd. | Modular overvoltage protection units |
| US10319545B2 (en) | 2016-11-30 | 2019-06-11 | Iskra Za{hacek over (s)}{hacek over (c)}ite d.o.o. | Surge protective device modules and DIN rail device systems including same |
| US10447026B2 (en) | 2016-12-23 | 2019-10-15 | Ripd Ip Development Ltd | Devices for active overvoltage protection |
| US10707678B2 (en) | 2016-12-23 | 2020-07-07 | Ripd Research And Ip Development Ltd. | Overvoltage protection device including multiple varistor wafers |
| US10340110B2 (en) | 2017-05-12 | 2019-07-02 | Raycap IP Development Ltd | Surge protective device modules including integral thermal disconnect mechanisms and methods including same |
| US10685767B2 (en) | 2017-09-14 | 2020-06-16 | Raycap IP Development Ltd | Surge protective device modules and systems including same |
| US11223200B2 (en) | 2018-07-26 | 2022-01-11 | Ripd Ip Development Ltd | Surge protective devices, circuits, modules and systems including same |
| US11862967B2 (en) | 2021-09-13 | 2024-01-02 | Raycap, S.A. | Surge protective device assembly modules |
| US11723145B2 (en) | 2021-09-20 | 2023-08-08 | Raycap IP Development Ltd | PCB-mountable surge protective device modules and SPD circuit systems and methods including same |
| US11990745B2 (en) | 2022-01-12 | 2024-05-21 | Raycap IP Development Ltd | Methods and systems for remote monitoring of surge protective devices |
| US12199412B2 (en) | 2022-06-02 | 2025-01-14 | Ripd Ip Development Ltd. | Surge protective devices, circuits, modules and systems including same |
| US12206234B2 (en) | 2022-09-20 | 2025-01-21 | Ripd Ip Development Ltd | Overvoltage protection device modules |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4656555A (en) * | 1984-12-14 | 1987-04-07 | Harvey Hubbell Incorporated | Filament wrapped electrical assemblies and method of making same |
| JP2647893B2 (en) * | 1987-03-06 | 1997-08-27 | セラヴェール | How to make an arrester |
| FR2619244B1 (en) * | 1987-08-06 | 1992-09-04 | Sediver Ste Europ Isolateurs V | PROCESS FOR MANUFACTURING A SURGE PROTECTOR AND SURGE PROTECTOR OBTAINED BY THIS PROCESS |
-
1990
- 1990-03-02 FR FR9002897A patent/FR2659169B1/en not_active Expired - Lifetime
-
1991
- 1991-02-26 CA CA002037115A patent/CA2037115A1/en not_active Abandoned
- 1991-03-01 AT AT91420071T patent/ATE115762T1/en not_active IP Right Cessation
- 1991-03-01 DK DK91420071.2T patent/DK0445054T3/en active
- 1991-03-01 EP EP91420071A patent/EP0445054B1/en not_active Expired - Lifetime
- 1991-03-01 ES ES91420071T patent/ES2065653T3/en not_active Expired - Lifetime
- 1991-03-01 DE DE69105779T patent/DE69105779T2/en not_active Expired - Fee Related
- 1991-03-04 TR TR91/0186A patent/TR25323A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DE69105779T2 (en) | 1995-04-27 |
| FR2659169A1 (en) | 1991-09-06 |
| CA2037115A1 (en) | 1991-09-03 |
| ES2065653T3 (en) | 1995-02-16 |
| DK0445054T3 (en) | 1995-01-23 |
| ATE115762T1 (en) | 1994-12-15 |
| DE69105779D1 (en) | 1995-01-26 |
| EP0445054A1 (en) | 1991-09-04 |
| TR25323A (en) | 1993-01-01 |
| FR2659169B1 (en) | 1992-06-19 |
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