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EP1708221B1 - Mit einer Schmelzsicherung und einem aus Isoliermaterial hergestellten Ausschaltelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern - Google Patents

Mit einer Schmelzsicherung und einem aus Isoliermaterial hergestellten Ausschaltelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern Download PDF

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Publication number
EP1708221B1
EP1708221B1 EP06290454A EP06290454A EP1708221B1 EP 1708221 B1 EP1708221 B1 EP 1708221B1 EP 06290454 A EP06290454 A EP 06290454A EP 06290454 A EP06290454 A EP 06290454A EP 1708221 B1 EP1708221 B1 EP 1708221B1
Authority
EP
European Patent Office
Prior art keywords
piece
pads
protection device
fusible
accordance
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
EP06290454A
Other languages
English (en)
French (fr)
Other versions
EP1708221A3 (de
EP1708221A2 (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 PL06290454T priority Critical patent/PL1708221T3/pl
Publication of EP1708221A2 publication Critical patent/EP1708221A2/de
Publication of EP1708221A3 publication Critical patent/EP1708221A3/de
Application granted granted Critical
Publication of EP1708221B1 publication Critical patent/EP1708221B1/de
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
    • H01H37/761—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
    • 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
    • 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.
  • an electrical protection device comprising at least first and second connection pads aligned in a first direction and separated by a predetermined distance, a fuse conductive part having first and second ends respectively in electrical and mechanical contact with the first and second pads, and an electrically insulating piece exerting on the fuse piece an elastic force applied between the two pads in a second direction perpendicular to the first, the fuse piece initially adopting an operational configuration in which it provides an 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, the insulating part being solicited by means ns resilient 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 s interposed between the first and second pads.
  • 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 structure disclosed by the Japanese patent document JP 8031299 does not exclude the risk that the fuse is broken by leaving a weak electrical path resistant against an electric arc likely to form in this type of device.
  • the purpose of the invention is to propose a protection device free of such a risk.
  • the device of the invention is essentially characterized in that the insulating part has 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 fuse piece in the operational configuration thereof.
  • the fuse piece undergoes, during its rupture, a shear avoiding the uncontrolled appearance of metal residues likely to provide a preferred path for an electric arc.
  • the fuse piece is constituted by a block of predefined shape and its first and second ends are mechanically held by the respective first and second pads against the effect of traction in the first direction. .
  • the insulating part may have a cavity defined between the first and second webs and extending in the second direction, the front edges of these first and second webs of the insulating part may also be bevelled to be sharp.
  • the cavity is for example delimited, in a third direction perpendicular to the first and second directions, by a third sail.
  • the insulating part advantageously 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 piece is preferably separated from the armed position of this piece by a stroke at least equal to the distance between the two pads.
  • the insulating part may comprise a rest face extending parallel to the first and second directions and resting on the fuse piece in the operational configuration thereof.
  • the protection device of the invention comprises a varistor, whether the first pad is connected to a first supply terminal of the varistor or constitutes it, that the second pad is connected to a first connection terminal the device to an electrical network or constitutes it, and that the varistor comprises a second power supply terminal which is connected to a second terminal of the device connection to an electrical network or which constitutes it.
  • the invention also relates to the application of the device as described above to the production of a lightning arrester cell.
  • 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 part. insulating 3.
  • connection pads 11 and 12 are aligned in a direction D1 ( figures 7 and 10a ), are separated by a determined distance d ( figure 4 ), and are respectively in electrical and mechanical contact with the ends 21 and 22 of the fuse piece 2.
  • the fuse piece 2 initially adopts an operational configuration illustrated in particular in figures 4 , 10c and 11c , in which it provides an electrical connection between the pads 11 and 12.
  • the insulating part 3 adopts, under the load of the spring 4, an armed position ( Figures 1 to 3 and 5 ) in which it exerts an elastic force F ( figure 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 ( Figures 6 to 9 ) in which it interposes between the studs 11 and 12.
  • the insulating part 3 has two webs 31 and 32, respectively adjacent to the pads 11 and 12.
  • the fuse piece 2 is advantageously constituted by a block of predefined shape, for example made of bismuth or 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 ( Figures 10a to 11c ) typically taking, although not limitingly, the shape of complementary reliefs, and to withstand a tension exerted between each pad and the fuse piece in the direction D1 of alignment of the pads 11 and 12.
  • 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 respective front edges 310 and 320 of these webs 31 and 32 bear on the fuse piece 2 in the operational configuration thereof to exert on the fuse piece a shearing force, and are preferably beveled to be relatively sharp.
  • the insulating part 3 advantageously has ( figure 7 ) a cavity 30 extending in the direction D2 for applying the force F and suitable for recovering the central fragment of the fuse piece when it breaks.
  • This cavity is defined between the webs 31 and 32 and preferably delimited by a third web 33 forming a floor.
  • 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 retaining means 51 and 52 which are provided with the studs 11 and 12 and the fuse piece 2 are shaped to allow force entrenchment of the fuse piece in these pads by a relative movement in a direction D3 perpendicular to both 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 device thus constituted can be applied to the production of a lightning arrester cell comprising a varistor 6.
  • the stud 11 may be connected to a first power supply terminal of the varistor 6 or directly constitute this first power supply terminal.
  • 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)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Claims (9)

  1. Elektrische Schutzvorrichtung, bestehend aus mindestens einem ersten und einem zweiten Kontaktstück (11, 12), die in einer ersten Richtung (D1) ausgerichtet sind und durch einen bestimmten Abstand (d) getrennt sind, einem schmelzbaren, leitfähigen Teil (2), das ein erstes und ein zweites Ende (21, 22) aufweist, das mit dem ersten bzw. zweiten Kontaktstück (11, 12) elektrisch und mechanisch in Kontakt steht, und einem elektrisch isolierenden Teil (3), das auf das schmelzbare Teil (2) eine Federkraft (F) ausübt, die zwischen den beiden Kontaktstücken (11, 12) in einer zweiten, zur ersten Richtung (D1) senkrechten Richtung (D2) angelegt ist, wobei das schmelzbare Teil (2) ursprünglich eine Arbeitsstellung einnimmt, in der es eine elektrische Verbindung zwischen dem ersten und dem zweiten Kontaktstück (11, 12) sicherstellt, und unter der Wirkung einer Temperaturerhöhung und der Federkraft (F) eine endgültige Unterbrechungsstellung einnimmt, in der die elektrische Verbindung unterbrochen ist, wobei das isolierende Teil (3) durch Federmittel (4) dazu veranlasst wird, im Arbeitszustand des schmelzbaren Teiles (2) eine gespannte Stellung einzunehmen, in der es die genannte Federkraft (F) auf das schmelzbare Teil (2) ausübt, und in der Unterbrechungsstellung des schmelzbaren Teiles (2) eine ausgelöste Stellung einzunehmen, in der es zwischen das erste und das zweite Kontaktstück (11, 12) tritt, dadurch gekennzeichnet, dass das isolierende Teil (3) einen ersten und einen zweiten Schirm (31, 32) aufweist, der am ersten bzw. zweiten Kontaktstück (11, 12) anliegt, die in entsprechenden Ebenen liegen, die zur ersten Richtung (D1) senkrecht verlaufen, und Stirnkanten (310, 320) aufweisen, die in der Arbeitsstellung des schmelzbaren Teiles (2) an diesem anliegen, dadurch, dass das schmelzbare Teil (2) aus einem Block einer bestimmten Form besteht, und dadurch, dass sein erstes und zweites Ende (21, 22) vom entsprechenden ersten bzw. zweiten Kontaktstück (11, 12) gegen die Wirkung eines Zuges in der ersten Richtung (D1) mechanisch gehalten werden.
  2. Schutzvorrichtung nach Patentanspruch 1, dadurch gekennzeichnet, dass das isolierende Teil (3) einen Hohlraum (30) aufweist, der zwischen dem ersten und dem zweiten Schirm (31, 32) eingegrenzt ist und sich in der zweiten Richtung (D2) erstreckt.
  3. Schutzvorrichtung nach Patentanspruch 2, dadurch gekennzeichnet, dass der Hohlraum (30) in einer dritten, auf der ersten und der zweiten Richtung (D1, D2) senkrechten Richtung (D3) durch einen dritten Schirm (33) eingegrenzt ist.
  4. Schutzvorrichtung nach irgendeinem der vorangehenden Patentansprüche, dadurch gekennzeichnet, dass das isolierende Teil (3) in einer dritten, auf der ersten und der zweiten Richtung (D1, D2) senkrechten Richtung (D3) eine Abmessung (H3) oder Höhe aufweist, die größer ist, als die entsprechende Abmessung (H2) oder Höhe des schmelzbaren Teiles (2).
  5. Schutzvorrichtung nach irgendeinem der vorangehenden Patentansprüche, dadurch gekennzeichnet, dass die genannten Stirnkanten (310, 320) des isolierenden Teiles (3) angephast sind, um scharf zu sein.
  6. Schutzvorrichtung nach irgendeinem der vorangehenden Patentansprüche, dadurch gekennzeichnet, dass das isolierende Teil (3) eine Ruheseite (34) aufweist, die parallel zur ersten und zweiten Richtung (D1, D2) verläuft und in der Arbeitsstellung des schmelzbaren Teiles (2) auf diesem ruht.
  7. Schutzvorrichtung nach irgendeinem der vorangehenden Patentansprüche, dadurch gekennzeichnet, dass die ausgelöste Stellung des isolierenden Teiles (3) von der gespannten Stellung dieses Teiles (3) durch einen Weg getrennt ist, der mindestens dem Abstand (d) gleich ist, der die beiden Kontaktstücke (1 1 , 12) trennt.
  8. Schutzvorrichtung nach irgendeinem der vorangehenden Patentansprüche, dadurch gekennzeichnet, dass sie einen Varistor (6) enthält, dadurch, dass das erste Kontaktstück (11) mit einem ersten Speiseanschluss des Varistors (6) verbunden ist oder ihn bildet, dadurch, dass das zweite Kontaktstück (12) mit einer ersten Klemme zum Anschluss der Vorrichtung an ein elektrisches Stromnetz verbunden ist oder sie bildet, und dadurch, dass der Varistor (6) einen zweiten Speiseanschluss (62) aufweist, der mit einer zweiten Klemme zum Anschluss der Vorrichtung an ein elektrisches Stromnetz verbunden ist oder sie bildet.
  9. Verwendung einer Schutzvorrichtung nach irgendeinem der vorangehenden Patentansprüche zur Schaffung einer Blitzschutzsicherungszelle.
EP06290454A 2005-03-30 2006-03-21 Mit einer Schmelzsicherung und einem aus Isoliermaterial hergestellten Ausschaltelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern Not-in-force EP1708221B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06290454T PL1708221T3 (pl) 2005-03-30 2006-03-21 Urządzenie do ochrony elektrycznej z topikiem i z odcinającą częścią izolującą oraz jego zastosowanie do pól odgromnikowych

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0503100A FR2884040B1 (fr) 2005-03-30 2005-03-30 Dispositif de protection electrique a fusible et piece isolante de rupture, et application aux cellules parafoudre

Publications (3)

Publication Number Publication Date
EP1708221A2 EP1708221A2 (de) 2006-10-04
EP1708221A3 EP1708221A3 (de) 2007-08-29
EP1708221B1 true EP1708221B1 (de) 2011-05-04

Family

ID=35207441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06290454A Not-in-force EP1708221B1 (de) 2005-03-30 2006-03-21 Mit einer Schmelzsicherung und einem aus Isoliermaterial hergestellten Ausschaltelement versehene Schutzvorichtung, und ihre Anwedung bei Überspannungsableitern

Country Status (5)

Country Link
EP (1) EP1708221B1 (de)
AT (1) ATE508467T1 (de)
DE (1) DE602006021657D1 (de)
FR (1) FR2884040B1 (de)
PL (1) PL1708221T3 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US388922A (en) 1888-09-04 sheeht
US4015228A (en) 1974-06-10 1977-03-29 Matsushita Electric Industrial Co., Ltd. Surge absorber
US4288833A (en) 1979-12-17 1981-09-08 General Electric Company Lightning arrestor
US4451814A (en) * 1982-06-14 1984-05-29 Fasco Controls Corporation Non-resettable thermal fuse
JPH0831299B2 (ja) 1987-01-12 1996-03-27 松下冷機株式会社 密封型サ−モスタツト
US5113169A (en) * 1990-06-01 1992-05-12 Illinois Tool Works Inc. Indicating fuse assembly
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

Also Published As

Publication number Publication date
EP1708221A3 (de) 2007-08-29
DE602006021657D1 (de) 2011-06-16
ATE508467T1 (de) 2011-05-15
FR2884040A1 (fr) 2006-10-06
FR2884040B1 (fr) 2009-06-26
PL1708221T3 (pl) 2011-10-31
EP1708221A2 (de) 2006-10-04

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