EP1708222A2 - Mit einem pressverbunden und in der Ausschaltrichtung vorgespannten Schmelzelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern - Google Patents

Mit einem pressverbunden und in der Ausschaltrichtung vorgespannten Schmelzelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern Download PDF

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Publication number
EP1708222A2
EP1708222A2 EP06290455A EP06290455A EP1708222A2 EP 1708222 A2 EP1708222 A2 EP 1708222A2 EP 06290455 A EP06290455 A EP 06290455A EP 06290455 A EP06290455 A EP 06290455A EP 1708222 A2 EP1708222 A2 EP 1708222A2
Authority
EP
European Patent Office
Prior art keywords
fuse piece
fuse
pads
piece
studs
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
EP06290455A
Other languages
English (en)
French (fr)
Other versions
EP1708222B1 (de
EP1708222A3 (de
Inventor
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 PL06290455T priority Critical patent/PL1708222T3/pl
Publication of EP1708222A2 publication Critical patent/EP1708222A2/de
Publication of EP1708222A3 publication Critical patent/EP1708222A3/de
Application granted granted Critical
Publication of EP1708222B1 publication Critical patent/EP1708222B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • 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
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/32—Insulating body insertable between contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/38—Means for extinguishing or suppressing arc
    • H01H2085/381—Means for extinguishing or suppressing arc with insulating body insertable between the end contacts of the fusible element

Definitions

  • the invention relates, in general, the protection of electrical equipment.
  • the invention relates, according to a first aspect, to an electrical protection device comprising at least first and second connection pads aligned in a first direction, a fusible conductive part having first and second ends respectively in electrical contact. and mechanics with the first and second pads, and biasing means exerting on the fuse piece an elastic force applied between the two pads in a second direction transverse to the first, the fuse piece initially adopting an operational configuration in which it provides a link electrical connection between the first and second pads, and adopting, under the effect of a rise in temperature and the elastic force, a final configuration of rupture in which the electrical connection is broken.
  • Such a device is for example described in the patent document Japanese JP 8031299 .
  • Systems of this type conventionally include a clipping component, such as a varistor, which is connected in series with a temperature sensitive 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 that this heating does not reach a value such that it generates risks of explosion or fire.
  • the temperature sensitive switch is formed of a fuse wire stretched between the first and second pads and subjected to an elastic bias in the direction of rupture.
  • the wire In case of excessive heating, the wire loses its mechanical strength by partial or total melting, and undergoes a break insulating from each other the first and second pads.
  • the object of the present invention is to propose an electrical protection device in which the fuse piece is fixed to each of the two pads in a simple, reproducible and reliable manner.
  • the device of the invention is essentially characterized in that the fuse piece is constituted by a block of predefined shape, in that each connection pad and the end of the fuse piece in contact with this stud are provided with respective mechanical retaining means, and in that the retaining means of the studs and the fuse piece are shaped to allow forcible entrenchment of the fuse piece in the studs by a relative movement in a third direction perpendicular to the first and second directions, the electrical contact of the fuse piece with the pads resulting at least partially from this embedding.
  • the means for retaining the studs and the fuse piece have respective abutment surfaces facing each other and inclined with respect to the first direction. respective bearing being arranged to exert on each other increasing bearing forces in response to increasing traction exerted between each stud and the fuse piece.
  • Each pad comprises, for example, a metal flange elastically flexed, cut and folded, this stud and the fuse piece being dimensioned so that the embedding of the fuse piece in this stud causes an elastic deformation of the blank constituting the stud.
  • the biasing means comprise an insulating part and elastic means and that the insulating part is urged by the elastic means to adopt, in the operational configuration of the fuse piece, an armed position in which it exerts said elastic force on the fuse piece, and to adopt, in the rupture configuration of the fuse piece, a triggered position in which it interposes between the first and second studs.
  • the insulating part may have first and second sails respectively adjacent to the first and second pads, extending in respective planes perpendicular to the first direction, and having front edges resting on the part fuse in the operational configuration thereof.
  • the insulating part may even have a cavity defined between the first and second webs and extending in the second direction, so as to absorb a portion of the fuse piece during its break.
  • the insulating part has, in the third direction, a dimension, or height, greater than the corresponding dimension, or height, of the fuse piece.
  • the triggered position of the insulating part is itself advantageously separated from the armed position of this part by a stroke at least equal to the distance separating the two studs.
  • the invention also relates to the application of the device as previously described to the production of a surge arrester cell comprising a varistor, and wherein the first stud is connected to or constitutes a first power supply terminal of the varistor, in which the second plot is connected to a first terminal connecting the device to an electrical network or constitutes it, and wherein the varistor comprises a second power supply terminal which is connected to a second terminal of the device to an electrical network or which constitutes it.
  • the invention relates to an electrical protection device comprising in particular two connection pads 11 and 12, a fusible conductive part 2, and biasing means typically constituted by an insulating part 3 and a spring 4 acting on this insulating part 3.
  • connection pads 11 and 12 are aligned in a direction D1 (FIGS. 7 and 10a) and are respectively in electrical and mechanical contact with the ends 21 and 22 of the fuse part 2.
  • the fuse part 2 initially adopts an illustrated operational configuration, in particular in Figures 4, 10c and 11c, wherein it provides an electrical connection between the pads 11 and 12.
  • the insulating part 3 adopts, under the bias of the spring 4, an armed position (FIGS. 1 to 3 and 5) in which it exerts an elastic force F (FIG. 2) on the fuse piece 2, this force being applied between the pads 11 and 12 in the direction D2 transverse to the direction D1.
  • the fuse piece 2 can also adopt, under the effect of a rise in temperature and the elastic force F, a rupture configuration in which the electrical connection between the pads 11 and 12 is broken.
  • the insulating part 3 adopts, under the bias of the spring 4, a triggered position (FIGS. 6 to 9) in which it interposes between the pads 11 and 12.
  • the fuse piece 2 consists of a block of predefined shape, for example made of bismuth or of a bismuth alloy.
  • predefined block of shape must be understood here as applicable to any block of material that can be handled at room temperature, without any particular precaution, or to be stored in bulk, at ambient temperature, with other blocks. of the same type without undergoing visible deformation.
  • connection pads 11 and 12 and the corresponding end 21 or 22 of the fuse piece 2 are provided with respective mechanical retaining means 51 and 52 (FIGS. 10a to 11c) typically, although not exclusively, in the form of reliefs complementary.
  • these retaining means 51 and 52 are shaped to allow forced embedding of the fuse piece 2 in the studs 11 and 12 by a relative movement in a direction D3 perpendicular to both in the direction D1 of mutual alignment of the pads 11 and 12 and the direction D2 of application of the elastic force F.
  • the electrical contact of the fuse piece 2 with the pads 11 and 12 results at least in part from this encasement, and is preferably provided only by the latter.
  • the retaining means 51 and 52 which are respectively provided with the pads 11, 12 and the fuse piece 2, have respective bearing surfaces S1 and S2 opposite one another and inclined with respect to the direction D1 ( Figures 10a to 11c).
  • these respective bearing surfaces S1 and S2 are arranged to exert on each other increasing bearing forces in response to increasing traction exerted between each of the pads 11 and 12 and the fuse piece 2.
  • each of the pads 11 and 12 is formed of a metal blank, flexural elastic, cut and folded.
  • each of these pads 11 and 12, and the fuse piece 2 are dimensioned so that the embedding of this fuse piece 2 in each pad causes an elastic deformation of the blank constituting this pad, the electrical contact between the fuse piece 2 and this pad is thus optimized.
  • the insulating part 3 has two webs 31 and 32 respectively adjacent to the pads 11 and 12, and extending in respective planes perpendicular to the direction D1.
  • the insulating part 3 may have (FIG. 7) a cavity 30 extending in the direction D2 of application of the force F.
  • This cavity is defined between the webs 31 and 32 and optionally delimited by a third sail 33.
  • the insulating part 3 advantageously has, in the third direction D3, a height H3 greater than the corresponding height H2 of the fuse piece 2.
  • the insulating part 3 also has a rest face 34 perpendicular to the direction D3 and resting on the fuse piece 2 in the operational configuration thereof.
  • the device thus constituted can be applied to the production of a surge arrester cell comprising a varistor 6.
  • the stud 11 can be connected to a first power supply terminal of the varistor 6 or directly constitute this first terminal of food.
  • the stud 12 may in turn be connected to a first connection terminal of the cell to an electrical network or constitute directly this first branch terminal.
  • the second power supply terminal 62 of the varistor 6 can then be connected to a second connection terminal of the cell to an electrical network, or directly constitute this second branch terminal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuses (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Thermistors And Varistors (AREA)
EP06290455A 2005-03-30 2006-03-21 Mit einem pressverbunden und in der Ausschaltrichtung vorgespannten Schmelzelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern Not-in-force EP1708222B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06290455T PL1708222T3 (pl) 2005-03-30 2006-03-21 Urządzenie do ochrony elektrycznej z obciskaną częścią topliwą, rozciąganą do przerwania, i jego zastosowanie do pól odgromnikowych

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0503101A FR2884041B1 (fr) 2005-03-30 2005-03-30 Dispositif de protection electrique a piece fusible sertie sollicitee a la rupture, et application aux cellules parafoudre

Publications (3)

Publication Number Publication Date
EP1708222A2 true EP1708222A2 (de) 2006-10-04
EP1708222A3 EP1708222A3 (de) 2007-08-29
EP1708222B1 EP1708222B1 (de) 2011-05-04

Family

ID=35207681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06290455A Not-in-force EP1708222B1 (de) 2005-03-30 2006-03-21 Mit einem pressverbunden und in der Ausschaltrichtung vorgespannten Schmelzelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern

Country Status (5)

Country Link
EP (1) EP1708222B1 (de)
AT (1) ATE508468T1 (de)
DE (1) DE602006021658D1 (de)
FR (1) FR2884041B1 (de)
PL (1) PL1708222T3 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE481459A (de) *
US2149773A (en) * 1937-10-25 1939-03-07 George W Huntley Safety plug
US4451814A (en) * 1982-06-14 1984-05-29 Fasco Controls Corporation Non-resettable thermal fuse
JPH0831299A (ja) * 1994-07-20 1996-02-02 Daito Tsushinki Kk サージ吸収器
US6430019B1 (en) * 1998-06-08 2002-08-06 Ferraz S.A. Circuit protection device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE481459A (de) *
US2149773A (en) * 1937-10-25 1939-03-07 George W Huntley Safety plug
US4451814A (en) * 1982-06-14 1984-05-29 Fasco Controls Corporation Non-resettable thermal fuse
JPH0831299A (ja) * 1994-07-20 1996-02-02 Daito Tsushinki Kk サージ吸収器
US6430019B1 (en) * 1998-06-08 2002-08-06 Ferraz S.A. Circuit protection device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 06, 28 juin 1996 (1996-06-28) & JP 08 031299 A (DAITO TSUSHINKI KK), 2 février 1996 (1996-02-02) *

Also Published As

Publication number Publication date
EP1708222B1 (de) 2011-05-04
ATE508468T1 (de) 2011-05-15
FR2884041B1 (fr) 2007-06-15
FR2884041A1 (fr) 2006-10-06
EP1708222A3 (de) 2007-08-29
DE602006021658D1 (de) 2011-06-16
PL1708222T3 (pl) 2011-10-31

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