EP1901320A1 - Kontaktvorrichtung für ein Elektrogerät und Elektrogerät mit derartiger Vorrichtung - Google Patents

Kontaktvorrichtung für ein Elektrogerät und Elektrogerät mit derartiger Vorrichtung Download PDF

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Publication number
EP1901320A1
EP1901320A1 EP07354037A EP07354037A EP1901320A1 EP 1901320 A1 EP1901320 A1 EP 1901320A1 EP 07354037 A EP07354037 A EP 07354037A EP 07354037 A EP07354037 A EP 07354037A EP 1901320 A1 EP1901320 A1 EP 1901320A1
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EP
European Patent Office
Prior art keywords
contact
contacts
conductive element
conductive
current
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.)
Withdrawn
Application number
EP07354037A
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English (en)
French (fr)
Inventor
Marie-Laure Michaux
Marc Serpinet
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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Filing date
Publication date
Application filed by Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP1901320A1 publication Critical patent/EP1901320A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/54—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by magnetic force

Definitions

  • the present invention relates to the general technical field of electrical appliances, and in particular operating devices such as switches.
  • Electrical devices such as switches, contactors, etc ... generally comprise a pair of conductive elements able to occupy either an open position, in which they are separated relative to each other and prohibit the passage current is a closed position, in which they allow the passage of current.
  • the conductive elements In the closed position, the conductive elements are in electrical contact with each other at a contact zone.
  • the contact pressure between the conductive elements in this contact zone is ensured by means of a contact pressure spring.
  • a switch (or a contactor) is a device with dynamic operation, that is to say it must be able to close and open in the presence of current.
  • a switch must be able to close on a high fault current short-circuit type, and open on the nominal current, or even open on fault currents up to fourteen times its current nominal, when the switch is associated with a differential protection device.
  • the contact architecture must not oppose this dynamic of operation in the presence of current.
  • the known devices generally use powerful contact pressure springs, capable of generating a contact pressure sufficient to counterbalance the repulsive effect of the local loops.
  • this solution has the disadvantage of requiring bulky springs, which is not always compatible with the growing requirements for miniaturization of operating devices.
  • such devices must also include a sufficiently powerful mechanism to actuate the contact pressure spring, and sufficiently robust to withstand the constraints in the closed position. Under these conditions, it is more difficult to trigger and open the device.
  • the remote or non-remote "tripping" function constitutes a growing need in the field of electrical equipment, and in particular in devices of the switch type that can be associated with differential protection devices, so that presence of a fault current, the differential protection device triggers the opening of the switch.
  • the fixed conductive element comprises two parallel arms each with a contact and the movable conductive element, is able to move in the space between the two arms, so that in the closed position, the element conductor is pinched between the two arms under the effect of the attraction forces generated by the current flowing in both arms.
  • This configuration takes advantage of the effect of the current flowing in the conductors away from the contact area to counterbalance the repulsive effect of the contacts.
  • the contact devices based on this principle also have several significant disadvantages.
  • the contact pressure force is directed in a plane perpendicular to the direction of movement of the contact mobile. Therefore, the higher the current, the higher the contact pressure is high and therefore the friction on the contacts is high which makes it difficult to close and open the device.
  • this architecture a significant risk of incomplete closure of the apparatus since from the moment the contact is established between the conductive elements, the clamping effect occurs and is opposed by friction, the displacement of the movable conductive element. Incomplete closure is undesirable as it can induce significant heating and damage to the contacts. It can also decrease the ability of the device to withstand the fault currents.
  • such devices are subject to seizure.
  • the energy needed to compensate for friction at closing and opening again requires a powerful mechanism, which will be more difficult to trigger. This is the reason why clamp architectures are generally used in non-tripping switches.
  • the present invention solves these problems and proposes a contact device for electrical apparatus, able to support without opening high currents such as short-circuit currents, having a structure and a space-saving mechanism, which can be triggered for example at distance, said device having a high closing power and particularly reliable operation, and requiring only a small number of parts to operate and an electrical device comprising it.
  • the subject of the present invention is a device for contacting an electrical apparatus comprising at least a first and at least a second conductive element mounted movable relative to one another between a closed position in which the two elements are in electrical contact and allow the passage of the current and an open position in which the two elements are separated and prohibit the passage of the current.
  • the first (s) element (s) conductor (s) comprises (s) at least a first pair of contacts, said contacts being separated from each other by at least one first conductive branch
  • the second (s) element (s) conductor (s) comprises at least a second pair of contacts, said contacts being separated from each other by at least a second conductive branch
  • said first (s) and second (s) conductive elements being mounted relative to each other so that in the closed position, the (the) first pair (s) of contact come (s) in contact with the second pair (s) of contacts, thus forming one (s) of the first (s) and one (s) second (s) zone (s) of contact
  • the first (s) branch (s) then being substantially facing the (respectively) second (s) branch (s) so that the current flowing through the device is shared between the first (s) and second (s) conductive elements and flows in the same meaning in the first (s) and second (s) branch (s).
  • the average distance between the paired contacts being L, and the average distance between the first and second branches facing d, then the ratio L / d is greater than 2.
  • the ratio L / d is greater than 3.
  • the first and second branches extend substantially parallel to one another.
  • the first and second branches extend substantially rectilinearly.
  • this device comprises a mechanism comprising a motor member adapted, in the closed position, to mechanically ensure a sufficient contact pressure force between the two pairs of contact.
  • the contact pressure force is exerted in the plane of displacement of the conductive elements.
  • the contact pressure force is directed in the direction of movement of the conductive elements.
  • the motor member comprises a first elastic means.
  • the mechanism is triggerable.
  • the above-mentioned conductive elements are mounted relative to one another so that when the contacts open, one of the two contact zones, called the first contact zone, opens. first.
  • the first contact zone is located closer to the mechanism than the second contact zone.
  • the first conductive element is fixed and the second conductive element is mobile.
  • the second conductive element is rotatably mounted.
  • the second conductive element is mounted to move in translation.
  • the device comprises at least one current supply member electrically connected to the second conductive element so as to substantially form a U with the latter, so that the current flows in opposite directions in the two arms of the U .
  • the device comprises a stop arranged so as to limit the recoil of the current supply member under the effect of electromagnetic forces.
  • the current supply member and the second conductive element are movable relative to each other.
  • the current supply member is formed by a flexible conductor such as a braid.
  • the mechanism comprises a rocker-type actuating member, supporting the second conductive element and mechanically linked to the latter by means of a second elastic means, which elastic means being dimensioned to delay the unloading of the second conductive element by the closing actuator.
  • the second elastic means comprises a spring blade.
  • the actuating member comprises at least one bearing surface against which the movable conductive element, via at least one bearing surface bears, in the open position. contacts.
  • the bearing surface of the actuating member is inclined relative to the bearing surface of the movable conductive element so that the contact of the conductive element located farthest from the mechanism dock first and take off last.
  • the movable conductive element comprises a holding lug, arranged to maintain said movable conductive member within a housing provided in the actuating member.
  • the contact device according to the invention comprises a closure device independent of the maneuver intended to successively ensure a rapid contact between the contacts and to reduce the time between the docking of the two pairs of contacts.
  • the present invention also relates to an electrical apparatus with dynamic operation such as a switch, a contactor, etc ... comprising a contact device comprising the previously mentioned features taken alone or in combination.
  • a contact device comprises a fixed contact element 2 'and a movable contact element 3' in the closed position, the two elements being in electrical contact so as to allow the passage of the current .
  • a contact pressure spring 10 ' provides the contact pressure between the conductive elements 2', 3 'at a contact zone 6'.
  • the contact pressure spring 10 ' is dimensioned not only to minimize the heating generated by the passage of the nominal current at the contact zone 6' but also to oppose the repulsion forces f generated by the passage of the current in the conductive elements.
  • This contact device is frequently used in electrical protection devices, such as circuit breakers, because it makes it possible to take advantage of the electromagnetic repulsive forces f 'in the contact zone 6' which favor the rapid opening of the contact elements 2 ', 3' on a short-circuit and therefore the breaking of the current.
  • This architecture is therefore well suited to devices with high breaking capacity such as circuit breakers, but is less suitable for switches that should not open in case of a short circuit, because they have no protection function against short-circuit currents.
  • FIG 2 another contact device according to the prior art is shown.
  • the contact device comprises a clamp 2 "formed by a fixed conductive element comprising two parallel arms 2a", 2b ", each arm supporting a contact 2c", and a movable conductive element 3 "having two contacts intended to cooperate with the contacts 2c “of the clamp 2" so as to form two contact zones 6 ", said movable conductive element 3" being able to move in the space separating the two arms 2a “, 2b” so that in the closed position, the movable conductive element 3 "is pinched between the two arms 2a", 2b “under the effect of the attraction forces generated by the current flowing in the two arms 2a", 2b ". If this architecture generally gives good results in terms of resistance to short-circuit currents, it proves difficult to be compatible with a trigger function.
  • the contact device 1 comprises a first and a second conductive elements 2, 3 mounted movable relative to each other between an open position and a closed position.
  • the first conductive element 2 is fixed, the second conductive element 3 is movable.
  • the first conductive element 2 comprises a first pair of contacts 2a, 2b, said contacts 2a, 2b being separated from each other by a first conductive branch 4.
  • the second conductive element 3 comprises a second pair of contacts 3a, 3b , said contacts 3a, 3b being separated from each other by a second conductive branch 5.
  • the conductive elements 2, 3 are mounted relative to each other within the device such that in position closing, the first pair of contacts 2a, 2b comes into contact with the second pair of contacts 3a, 3b, thus forming a first and a second contact area 6, 7, the first and the second branches 4, 5 then being substantially facing one another so that the current I through the device divides into two streams 1/2 between the two conductive elements 2, 3 and flows in the same direction S in the first and second branches 4, 5.
  • the current flowing in the same direction S in the two branches generates mutual attraction forces f1 on the two branches, which thus increase the contact pressure between the two contact pairs 2a, 2b and 3a, 3b. These forces are thus opposed, when the current increases, to the repulsion in the contact zones 6, 7.
  • the holding of the switch in the closed position at high current values (short circuits) is thus improved compared to the devices. known.
  • the current separating in two in the two branches 4, 5 and in the two contact zones 6, 7, the contact heating is advantageously halved.
  • the first and second branches 4, 5 extend substantially parallel and rectilinear. This makes it possible to take better advantage of the efforts of mutual attraction of the two branches 4,5.
  • the ratio L / d is greater than 2, and even more preferably greater than 3.
  • the distance d refers to an average distance between the branches and more precisely the distance between the average current lines.
  • the two branches have a non-rectilinear shape.
  • the distance between the contacts will be measured taking into account the average extension line of the branches.
  • the contact device 1 comprises a mechanism 8 that can be actuated by means of a lever 19 and that includes a motor member 9 adapted, in the closed position, to mechanically provide a force sufficient contact pressure F between the two pairs of contacts 2a, 2b on the one hand, and 3a, 3b on the other hand.
  • the contact pressure force F is advantageously small enough to limit the heating to normative values under nominal current.
  • the contact pressure thus comprises a purely mechanical component, originating from the pressure force of contact F provided by the drive member 9 and a part of electromagnetic origin, provided by the mutual attraction efforts of the branches 4, 5.
  • the mechanism 8 is advantageously triggerable, for example by means of a triggering device integrated or not into the device (differential release), or by means of a remote trigger, of the type triggering voltage emitting or lack of tension.
  • the contact pressure force F is exerted in the plane of movement of the conductive elements 2, 3 and directed in the direction of movement of the conductive elements.
  • the driving member 9 comprises a first resilient means 10 in the form of a spring.
  • the device according to the invention is thus less sensitive to jamming and friction at closing and opening than the devices of the prior art, in particular that of the clamp type shown in FIG. 2, which makes it possible to limit the risk of incomplete closure of the device.
  • the operating device according to the invention can have an integrated "trigger" function or remotely, the energy to trigger the mechanism being low compared to the devices of the invention. prior art.
  • the conductive elements 2, 3 are mounted relative to one another so that during opening, one of the two contact zones 6, 7, called the first contact zone 6, opens with first.
  • the electric arc is then formed at the level of the second contact zone 7.
  • the first contact zone 6 is located closer to the mechanism 8 than the second contact zone 7.
  • This configuration ensures that the electric arc generated at the opening of the device 1 is quickly removed from the contacts and in the opposite direction to that of the mechanism. It is indeed necessary to avoid the stagnation of the arc at the contacts and to prevent the electric arc from entering the mechanism, so as not to degrade and / or pollute the latter.
  • the second conductive element 3 is rotatably mounted. But a second conductive element 3 mounted mobile in translation could be an alternative embodiment possible.
  • the device advantageously comprises at least one current supply member 11, electrically connected to the second movable conductive member 3, said current supply member 11 being arranged relative to the second conductive element 3 so as to substantially form a U with the latter , so that the current flows in opposite directions in both arms of the U.
  • This particular configuration contributes to the contact pressure since the current flowing forming a loop in the current supply member 11 and in the second movable conductive element 3 induces electromagnetic forces f2 tending to maintain the second conductive element 3 movable. contact with the first fixed conductive element 2.
  • the electromagnetic forces f1 and f2 are thus added to counterbalance the repulsive effect in the contact zones 6, 7. Thanks to this configuration, the size of the contact device 1 is advantageously In particular, the U-shaped configuration between the current supply member 11 and the second conductive element 3 reduces the length L required between the contacts in order to obtain the desired effect.
  • the current supply member 11 and the second conductive element 3 are movable relative to each other.
  • the current supply member 11 is formed by a flexible conductor 12, braid type.
  • the device comprises a stop (not shown) arranged to prevent the recoil of the current supply member 11 under the effect of electromagnetic forces f2. The retreat of the braid could indeed attenuate the intensity of the electromagnetic forces f2 and reduce the efforts of mutual attraction of the first and second conductive elements 2,3.
  • the mechanism 8 comprises an actuating member 13, of the pendulum type, supporting the second conductive element 3 and mechanically connected thereto via a second elastic means 14 (FIGS. 7 and 8), dimensioned to delay the recoil of the actuating member 13 after contacting the contacts, and thus the unloading of the second conductive element 3 by the actuating member 13 at the closing.
  • This second elastic means is formed by a spring blade 15.
  • the presence of the second elastic means advantageously makes it possible to increase the closing power in short circuit of the operating device.
  • the short-circuit closing capability characterizes the ability of the device to establish short-circuit currents.
  • the presence of the actuating member 13 may induce a delayed "rebound", ie a recoil of the actuating member 13 after contacting the contacts, this recoil resulting in a shedding of the second conductive element 3 and the formation of an arc that can generate excessive degradation of contacts or even destruction of the device.
  • the spring blade 15 delays the shedding and thus allows the electromagnetic forces to grow while the contacts 2a, 2b and 3a, 3b are in place. At the moment when the shedding should occur, the electromagnetic forces are sufficient to maintain the second conductive element 3 in abutment against the first and annihilate the load shedding.
  • the operating device according to the invention thus has a higher closing power than the devices of the prior art.
  • the mechanism 8 further comprises, as illustrated in FIG. 7, a closure device independent of the maneuver 20 arranged to minimize the delay between the contacting of the contacts 2a, 3a and 2b, 3b and to prevent the closure speed from closing. contacts is related to the speed of manipulation of the lever 19.
  • the closing device independent of the maneuver 20 advantageously comprises a locking pawl 21 adapted to cooperate with a contact surface 22 of substantially complementary shape, formed on the organ actuator 13, such that when the locking pawl 21 comes into contact with said contact surface 22, it blocks, by friction, the displacement of the actuating member 13 until the stored energy by the motor member 9 during closing is sufficient to overcome friction.
  • the actuating member 13 is then released and moves rapidly towards its closed position by driving the second conductive element 3.
  • the time interval between the respective docking of the contacts 3a, 3b is advantageously reduced and mutual attraction efforts are quickly put in place.
  • the actuating member 13 advantageously comprises at least one bearing surface 16, against which the second movable conductive element 3, via its own bearing surface 17 bears in abutment in the open position or when the paired contacts 2a, 2b and 3a, 3b are no longer in contact.
  • the bearing surface 16 is advantageously inclined so that the contact 3b of the contact element 3, the farthest from the mechanism 8, dock first and lastly takes off.
  • the second conductive element 3 advantageously comprises a holding pin 18, arranged to hold the second conductive element 3 inside a housing provided in the actuating member 13.
  • the second conductive element 3 is advantageously mounted movably within the housing, against the spring blade 15.
  • the invention applies to any dynamically operating electrical apparatus comprising a contact device for switching on and off an electrical installation, such as a switch or a contactor, such apparatus being able to establish currents. short circuit type faults.
  • a contact device has thus been produced according to the invention, which is able to withstand, without opening, high currents such as short-circuit currents, which has a compact architecture of contacts and a mechanism, whose closing and opening are particularly reliable, and remotely triggerable.
  • the device of the invention requires only a small number of parts for its implementation and has a contact architecture adaptable to a large number of mechanisms. Due to the characteristics of the presence of the second spring, this device has a high closing power compared to devices of the prior art.
  • each conductive element could comprise several branches, each branch having several contacts.
  • the number of conductive elements could be greater than two.

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  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
EP07354037A 2006-09-12 2007-06-21 Kontaktvorrichtung für ein Elektrogerät und Elektrogerät mit derartiger Vorrichtung Withdrawn EP1901320A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0607956A FR2905795B1 (fr) 2006-09-12 2006-09-12 Dispositif de contact pour appareil electrique et appareil electrique equipe d'un tel dispositif

Publications (1)

Publication Number Publication Date
EP1901320A1 true EP1901320A1 (de) 2008-03-19

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EP07354037A Withdrawn EP1901320A1 (de) 2006-09-12 2007-06-21 Kontaktvorrichtung für ein Elektrogerät und Elektrogerät mit derartiger Vorrichtung

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EP (1) EP1901320A1 (de)
CN (1) CN101145453A (de)
FR (1) FR2905795B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2659083R1 (es) * 2015-08-06 2018-04-11 Beijing People's Electric Plant Co Ltd Un sistema de contacto en un interruptor de bajo voltaje y un interruptor de bajo voltaje
EP3770934A1 (de) * 2019-07-25 2021-01-27 Rail Power Systems GmbH Schaltgerät und spannungsbegrenzungseinrichtung mit einem schaltgerät
EP3770935A1 (de) * 2019-07-25 2021-01-27 Rail Power Systems GmbH Spannungsbegrenzungseinrichtung mit einem schaltgerät
WO2022010780A3 (en) * 2020-07-06 2022-02-17 Mersen Usa Ep Corp. Disconnect device with interlock mechanism

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2974660B1 (fr) * 2011-04-27 2018-05-25 Legrand France Dispositif de contact electrique a coupure performante
FR2979474B1 (fr) 2011-08-26 2013-09-27 Schneider Electric Ind Sas Dispositif de contacts de puissance a compensation electrodynamique
FR3053154B1 (fr) * 2016-06-24 2019-08-09 Hager-Electro Sas Appareil electrique de protection de ligne

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1734691U (de) * 1955-07-04 1956-11-29 Sursum Elek Zitaets Ges Leyhau Kontaktanordnung fuer selbstschalter.
DE1104588B (de) * 1959-08-28 1961-04-13 Siemens Ag Niederspannungs-Leistungsschalter
FR1303015A (fr) * 1961-07-10 1962-09-07 Comp Generale Electricite Interrupteur du type compensé dans lequel les efforts électrodynamiques de boucle sont utilisés pour s'opposer à la répulsion aux points de contact
DE1183575B (de) * 1962-07-31 1964-12-17 Licentia Gmbh Kontaktsystem, z. B. fuer Selbstschalter
DE1640885B1 (de) * 1966-11-16 1970-06-25 Licentia Gmbh Kontaktanordnung
DE2260837A1 (de) * 1972-12-13 1974-06-20 Calor Emag Elektrizitaets Ag Kontaktanordnung fuer leistungsschalter
US5694099A (en) * 1993-08-19 1997-12-02 Blp Components Limited Switching devices
GB2418780A (en) * 2004-09-30 2006-04-05 Blp Components Ltd Electrical contactors

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1734691U (de) * 1955-07-04 1956-11-29 Sursum Elek Zitaets Ges Leyhau Kontaktanordnung fuer selbstschalter.
DE1104588B (de) * 1959-08-28 1961-04-13 Siemens Ag Niederspannungs-Leistungsschalter
FR1303015A (fr) * 1961-07-10 1962-09-07 Comp Generale Electricite Interrupteur du type compensé dans lequel les efforts électrodynamiques de boucle sont utilisés pour s'opposer à la répulsion aux points de contact
DE1183575B (de) * 1962-07-31 1964-12-17 Licentia Gmbh Kontaktsystem, z. B. fuer Selbstschalter
DE1640885B1 (de) * 1966-11-16 1970-06-25 Licentia Gmbh Kontaktanordnung
DE2260837A1 (de) * 1972-12-13 1974-06-20 Calor Emag Elektrizitaets Ag Kontaktanordnung fuer leistungsschalter
US5694099A (en) * 1993-08-19 1997-12-02 Blp Components Limited Switching devices
GB2418780A (en) * 2004-09-30 2006-04-05 Blp Components Ltd Electrical contactors

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2659083R1 (es) * 2015-08-06 2018-04-11 Beijing People's Electric Plant Co Ltd Un sistema de contacto en un interruptor de bajo voltaje y un interruptor de bajo voltaje
EP3770934A1 (de) * 2019-07-25 2021-01-27 Rail Power Systems GmbH Schaltgerät und spannungsbegrenzungseinrichtung mit einem schaltgerät
EP3770935A1 (de) * 2019-07-25 2021-01-27 Rail Power Systems GmbH Spannungsbegrenzungseinrichtung mit einem schaltgerät
WO2021013767A1 (de) * 2019-07-25 2021-01-28 Rail Power Systems Gmbh Spannungsbegrenzungseinrichtung mit einem schaltgerät
WO2021013763A1 (de) * 2019-07-25 2021-01-28 Rail Power Systems Gmbh Schaltgerät und spannungsbegrenzungseinrichtung mit einem schaltgerät
WO2022010780A3 (en) * 2020-07-06 2022-02-17 Mersen Usa Ep Corp. Disconnect device with interlock mechanism

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Publication number Publication date
FR2905795A1 (fr) 2008-03-14
CN101145453A (zh) 2008-03-19
FR2905795B1 (fr) 2012-11-16

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