EP1650771B1 - Dispositif perfectionné de protection d'appareils électriques contre des surtensions - Google Patents

Dispositif perfectionné de protection d'appareils électriques contre des surtensions Download PDF

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Publication number
EP1650771B1
EP1650771B1 EP05292033A EP05292033A EP1650771B1 EP 1650771 B1 EP1650771 B1 EP 1650771B1 EP 05292033 A EP05292033 A EP 05292033A EP 05292033 A EP05292033 A EP 05292033A EP 1650771 B1 EP1650771 B1 EP 1650771B1
Authority
EP
European Patent Office
Prior art keywords
moving part
conductor
limiting component
protection device
junction zone
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.)
Not-in-force
Application number
EP05292033A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1650771A1 (fr
Inventor
Fernando Araujo
Christophe Auvray
Marcel Meriguet
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.)
Legrand SNC
Legrand France SA
Original Assignee
Legrand SNC
Legrand France 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 Legrand SNC, Legrand France SA filed Critical Legrand SNC
Priority to PL05292033T priority Critical patent/PL1650771T3/pl
Publication of EP1650771A1 publication Critical patent/EP1650771A1/fr
Application granted granted Critical
Publication of EP1650771B1 publication Critical patent/EP1650771B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/764—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet
    • 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 generally to the field of electrical protection.
  • the invention relates to a device for protecting electrical devices against overvoltages, for example due to lightning, this device comprising at least: first and second connection pads; a thermosensitive switch comprising at least one conductive moving part and a first fusible link; elastic means exerting a permanent stress on the moving part; and a non-linear voltage-current characteristic clipping component, such as a varistor, having a first terminal directly connected to the first connection pad, and a second terminal selectively connected to the second pad via the switch thermosensitive, the moving part being, in normal operation of the device, maintained by the first fuse link in a closed position in which it establishes an electrical contact between first and second conductors, one of which is at the potential of the second connection pad and the other at the potential of the second terminal of the clipping component, and adopting, under the load of the elastic means and in the event of overheating of the clipping component having caused a melting of the first fuse link, an open position in which introduces, between the first and second conductors, a space which isolates them
  • the clipping component conventionally used in these devices is constituted by a varistor, which is mounted in series, between the two connection pads, with a thermosensitive switch.
  • the varistors are, towards the end of their life, the seat of a significant heating, the thermosensitive switch having precisely the function of disconnecting the varistor before this heating n ' reaches such a value that it creates a risk of explosion or fire.
  • thermosensitive switch can essentially take three known forms.
  • a moving part a rigid part fastened to at least one of the first and second conductors by a fusible link formed by a low melting point weld, this moving part being biased in translation by a spring in a direction to move away from his or her welds.
  • the second possibility is to use, as a moving part, an elastic conductive part whose first end is fixed permanently on the first conductor and whose second end is fixed to the second conductor by a fusible link formed by a low melting point weld, this part being thus movable only at its second end, which is disengaged from the second conductor, by the inherent elasticity of this part, as soon as the heating of the varistor caused fusion of the weld.
  • the third possibility which is described in the utility certificate DE 93 05 796 is to use, as a moving part, a locally flexible piece biased by a spring.
  • This moving part then has a first electrical junction area by which it is fixed on the first conductor by means of the first fuse link, and a second electrical junction area by which it is mounted movable relative to the second conductor, the elastic means exerting on this moving part a pair urging the first junction zone at a distance from the first conductor by bending and rotating the moving part around the second junction zone.
  • the object of the present invention is to propose a device for protecting electrical devices against overvoltages freed from the aforementioned compromises.
  • the device of the invention is essentially characterized in that the moving part is rigid and in that the temperature-sensitive switch comprises a second fusible link fixing, in normal operation of the device, the second electrical junction zone to the second conductor and helping to block the rotation of the moving part, this second fusible link also being merged in case of overheating of the clipping component and allowing the rotation of the moving part.
  • the first conductor is for example directly formed by the second connection pad, and the second conductor is for example directly formed by the second terminal of the clipping component.
  • the second conductor may also have a flattened shape of which a minimum dimension or thickness extends at least substantially along the first direction, the moving part then preferably having an axis of rotation extending itself at least substantially in the first direction.
  • the axis of rotation of the moving part can for example pass through an eye made in the moving part and / or in the second conductor.
  • the device of the invention comprises an insulating casing supporting the connection pads and in which are housed the thermosensitive switch, the elastic means, and the clipping component, the axis of rotation of the movable piece being able to be formed, at least partially, by an internal lug of the housing.
  • the second connection pad has a flat portion extending parallel to the axis of rotation of the moving part, and that this moving part is constituted by a cut metal blank having at least a right-angle fold defining, on this moving part, a first branch on which is formed the first junction zone fixed to the flat of the second stud by the first fuse link, and a second branch perpendicular to the first and on which is formed the second junction zone attached to the second terminal of the clipping component by the second fuse link.
  • the device of the invention may also comprise, in a manner known per se, a tripping indicator mechanically linked to the moving part on the side of the first junction zone of this mobile part and driven in translation during a rotation of the part. mobile.
  • the elastic means are for example constituted by a spring extending parallel to a large dimension of the clipping component between a fastening point formed in the housing and a point hooking arranged on the moving part on the side of its first junction zone.
  • the invention relates to a device for protecting electrical devices against overvoltages, especially against overvoltages due to lightning.
  • Such a device comprises, in a manner known per se, two connection pads 11 and 12, a thermosensitive switch 2 associated with elastic means such as a spring 3, and a voltage clamping component 4 with a voltage-current characteristic of linearly connected in series with the thermosensitive switch 2 between the connection pads 11 and 12, this component being in this case represented in the form of a varistor oxide (s) metal (s).
  • a varistor oxide (s) metal s
  • thermosensitive switch 2 comprises a conductive moving part 21, associated with at least one fusible link 221 typically constituted by a weld with a low melting point, melting at a temperature, for example of the order of 100 to 120 ° C.
  • the spring 3, whose function is to exert permanently on the movable part 21 a bias in the direction of a break of the fuse link 221, is for example constituted by a coil spring working in tension.
  • the varistor 4 has two terminals 41 and 42, the first 41 of which is directly connected to the first connection pad 11, and the second 42 of which is selectively connected to the second connection pad 12 through the thermosensitive switch 2.
  • the moving part 21 is held by the fuse link 221 in a closed position which is illustrated in FIGS. 1A, 1B, and 3A to 4B and in which it establishes an electrical contact between two conductors 12 and 42.
  • these conductors are preferably directly constituted, according to the invention, by the second connection pad 12 and by the second terminal 42 of the varistor 4.
  • the first of the two conductors that connects the movable part 21 is at the electrical potential of the connection pad 12, and that the second of these conductors defines the electrical potential of the terminal 42 of the varistor 4, so that the varistor 4 is connected to the pads 11 and 12 in the normal operating configuration of the device.
  • the moving part 21 adopts, under the bias of the spring 3, an open position as illustrated in FIGS. 2A and 2B, and in which it introduced, between the conductors 12 and 42, a space E ( Figure 2A) which isolates these conductors from each other, the varistor 4 then ceasing to be connected to the connection pad 12 and therefore no longer traversed by no current.
  • the movable part 21 is rigid and mounted to rotate about an axis of rotation remote from the fuse link 221.
  • the moving part 21 has in practice two electrical junction zones 211 and 212, in this case comparable to the two end portions of this part 21.
  • the moving part 21 is firstly fixed on the connection pad 12 by its first electrical junction area 211 by means of the fuse link 221, and secondly rotatably mounted, by its second zone 212 electrical junction, with respect to the terminal 42 of the varistor 4.
  • the spring 3 thus exerts on the moving part 21 a torque which urges the first junction zone 211 away from the stud 12 by rotation of the moving part 21 around the second junction zone 212.
  • thermosensitive switch 2 preferably comprises a second fuse link 222 fixing, in normal operation of the device, the second electrical junction zone 212 to the second terminal 42 of the varistor 4.
  • This second fuse link 222 which therefore contributes, with the first fuse link 221, to block the rotation of the moving part 21 in the normal operating configuration of the device, is also merged in the event of abnormal overheating of the varistor 4 and then authorizes the rotation of the moving part 21.
  • the second fusible link for example also consisting of a low melting point weld, is particularly advantageous for several reasons.
  • this second fuse link 222 avoids the formation, between the terminal 42 and the moving part 21, of any electric arc that could have the effect of soldering the piece 21 to this terminal 42.
  • this second link 222 melts before the first fuse link 221, and forms a fluid bearing facilitating the rotation of the part 21, which thus occurs immediately after the melting of the first fuse link 221.
  • each terminal 41 and 42 of the varistor 4 has a flattened shape whose minimum dimension, also called thickness, extends in a direction such that D1 in FIGS. 1B and 4B
  • each terminal 41 and 42 of the varistor 4 and at least the second terminal 42 has a flattened shape whose thickness also extends in the direction D1, and secondly that the axis of rotation 5 of the movable part 21 also extends along the same direction D1.
  • the device of the invention comprises an insulating housing 7 which supports the connection pads 11 and 12, and in which are housed the thermosensitive switch 2, the spring 3, and the varistor 4.
  • the axis of rotation 5 of the movable part 21 is formed by an internal lug of the housing 7.
  • this axis 5 passes for example through an eye 6 made in the moving part 21 and / or in the second terminal 42 of the varistor 4.
  • the spring 3 can extend parallel to one of the longer sides of the varistor 4, between an attachment point 70 formed in the housing 7 and a hooking point 213 formed on the moving part 21 of the next to its first junction zone 211.
  • the second connection pad 12 may consist of a metal blank cut and folded at an angle, and advantageously has a flat portion 120 extending parallel to the axis of rotation 5 of the movable part 21.
  • this pad 12 may be made of a metal or a metal alloy less conduct heat than copper, and present holes such as those shown in Figure 2B under reference 121.
  • the movable part 21 may itself consist of a metal blank cut and folded, but preferably made of copper or any other metal or metal alloy very conducive to heat.
  • the movable part 21 may in particular comprise a fold 210 at right angles, defining first and second branches 21A and 21B of this movable part 21.
  • the first branch 21A on which is formed the first zone 211 of electrical junction, is fixed to the flat portion 120 of the second stud 12 of the varistor 4 by the first fuse link 221.
  • the second branch 21B which is perpendicular to the first branch 21A and on which is formed the second zone 212 of electrical junction, is fixed to the second terminal 42 of the varistor 4 by the second fuse link 222.
  • the device of the invention may finally comprise a trigger indicator 8 mechanically connected to the movable part 21 and able to provide, in particular through a window 71 of the housing 7, an indication of the position of the moving part 21.
  • the movable part 21 may for example have, on the side of its first junction zone 211, a lateral flange in which is formed a light 214 (FIG. 3B) slidably receiving a lug 80 of the trigger indicator 8 , the latter being thus driven in translation when the moving part 21 passes from its closed position to its open position by rotation about its axis 5.
  • a light 214 FIG. 3B

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
EP05292033A 2004-10-22 2005-09-29 Dispositif perfectionné de protection d'appareils électriques contre des surtensions Not-in-force EP1650771B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05292033T PL1650771T3 (pl) 2004-10-22 2005-09-29 Udoskonalone urządzenie zabezpieczające aparaty elektryczne przed przepięciami

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0411269A FR2877154B1 (fr) 2004-10-22 2004-10-22 Dispositif perfectionne de protection d'appareils electriques contre des surtensions

Publications (2)

Publication Number Publication Date
EP1650771A1 EP1650771A1 (fr) 2006-04-26
EP1650771B1 true EP1650771B1 (fr) 2007-11-07

Family

ID=34949976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05292033A Not-in-force EP1650771B1 (fr) 2004-10-22 2005-09-29 Dispositif perfectionné de protection d'appareils électriques contre des surtensions

Country Status (4)

Country Link
EP (1) EP1650771B1 (es)
ES (1) ES2298968T3 (es)
FR (1) FR2877154B1 (es)
PL (1) PL1650771T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ304868B6 (cs) * 2011-04-01 2014-12-17 Saltek S.R.O. Svodič přepětí s výměnným modulem přepěťové ochrany

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006038005B4 (de) * 2006-05-22 2009-04-23 Dehn + Söhne Gmbh + Co. Kg Anschluss- und Basisteil zur Aufnahme eines steckbaren Überspannungsableiters
CZ2008764A3 (cs) * 2008-12-03 2010-06-16 Kiwa Spol. S R.O. Zarízení pro prepetovou ochranu se signalizací stavu ochrany
FR2984006B1 (fr) * 2011-12-07 2017-05-12 Legrand France Boitier pour dispositif de protection contre les surtensions et dispositif de protection contre les surtensions associe.
FR3024602B1 (fr) * 2014-08-01 2016-08-05 Abb France Cartouche de dispositif de protection d’installation electrique a connecteurs croises
LU100141B1 (de) * 2017-03-15 2018-09-19 Phoenix Contact Gmbh & Co Reihenklemmen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50119928U (es) * 1974-03-16 1975-09-30
DE9305796U1 (de) * 1993-04-17 1993-06-17 Dehn + Söhne GmbH + Co KG, 8500 Nürnberg Überspannungsschutzanordnung mit einem in einem Gehäuse untergebrachten Varistor
AT400781B (de) * 1993-11-02 1996-03-25 Felten & Guilleaume Ag Oester Überspannungsschutzvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ304868B6 (cs) * 2011-04-01 2014-12-17 Saltek S.R.O. Svodič přepětí s výměnným modulem přepěťové ochrany

Also Published As

Publication number Publication date
ES2298968T3 (es) 2008-05-16
EP1650771A1 (fr) 2006-04-26
FR2877154B1 (fr) 2006-12-22
FR2877154A1 (fr) 2006-04-28
PL1650771T3 (pl) 2008-03-31

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