EP2680293B1 - Mécanisme de déclenchement - Google Patents

Mécanisme de déclenchement Download PDF

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Publication number
EP2680293B1
EP2680293B1 EP13161264.0A EP13161264A EP2680293B1 EP 2680293 B1 EP2680293 B1 EP 2680293B1 EP 13161264 A EP13161264 A EP 13161264A EP 2680293 B1 EP2680293 B1 EP 2680293B1
Authority
EP
European Patent Office
Prior art keywords
plunger
contact
moving contact
switching
tripping
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.)
Active
Application number
EP13161264.0A
Other languages
German (de)
English (en)
Other versions
EP2680293A1 (fr
Inventor
Michael Neumeier
Tobias Sturm
Christoph Weber
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP2680293A1 publication Critical patent/EP2680293A1/fr
Application granted granted Critical
Publication of EP2680293B1 publication Critical patent/EP2680293B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • the invention relates to a trigger mechanism for a protective switching device, which has a lockable by means of a switching mechanism moving contact, a plunger and a release lever. Furthermore, the invention relates to an electro-mechanical protection device with such a trigger mechanism.
  • Circuit-breakers such as circuit breakers or circuit breakers are used in particular as switching and safety elements in electrical energy supply networks. Circuit breakers are specially designed for high currents.
  • a circuit breaker is an overcurrent protection device in the electrical installation and is used in particular in the field of low-voltage networks. Circuit breakers and miniature circuit breakers guarantee a safe shutdown in the event of a short circuit and protect the protected consumers and systems from overload. They protect lines, for example, from damage caused by overheating as a result of too high an electrical current and are designed to switch off the circuit to be monitored automatically in the event of a short circuit or overload, thus disconnecting it from the mains.
  • Such protective switching devices generally have a switching contact with a fixed contact element - the so-called fixed contact - and a relatively movable contact element - the so-called moving contact - on.
  • the moving contact makes contact with the fixed contact.
  • To separate the current flow of the moving contact is moved away from the fixed contact.
  • the interruption of the current flow leads at least briefly to each protective switching device to a voltage flashover between the fixed and the movable contact element, since the Distance during the separation process of the contact elements for isolation is not sufficient. If there is a gas between the two switching contacts, this is ionized by the flashover with a correspondingly high voltage difference between the contact elements, an arc being formed due to the gas discharge.
  • a circuit breaker which has a first triggering device for detecting and switching off a short circuit and a second triggering device for detecting and switching off an overload condition. Furthermore, the circuit breaker has a switching contact with a fixed contact and a movable movable contact relative thereto and a release lever which is coupled to the first triggering device and the second triggering device such that actuated when triggering the first triggering device and / or the second triggering device of the trigger lever and the switching contact is opened.
  • Circuit breakers or circuit breakers are therefore designed so that the arcing occurring when opening the switch contacts deleted and thus the flow of current is interrupted.
  • these protective switching devices have a magnetic trip system with a coil and a relatively movable armature plunger unit, through which the current, or even a portion of the current flowing to the switch contacts, is passed.
  • the coil attracts the armature, whereby the plunger meets a release lever, whereby a switching mechanism of the protective device is released.
  • the protective switching device is triggered and interrupted the flow of current through the switching contact pair.
  • Magnetic releases or magnetic trip units are used in protective switching devices, for example, to prevent the fusion of current-carrying contact surfaces at higher currents To ensure a safe shutdown if a resulting arc could damage the switching device.
  • short tripping times are advantageous - in particular because the range of application of the protective switching device can be limited by a too long tripping time.
  • the dynamic forces of the short-circuit current are used on the one hand.
  • a Lorenz force is generated due to the guided in parallel, in the set direction by the short-circuit current conductor, which is directed such that the parallel adjacent conductors are pressed apart.
  • this Lorenz force causes that from a certain short-circuit current limit, the moving contact is moved away from the fixed contact. This effect is referred to as dynamic contact opening and contributes to a shortening of the response of the protective device in the event of a short circuit at.
  • opening of the switching contact is also effected by means of the magnetic triggering system.
  • the coil of the magnetic release system is energized with the short-circuit current, whereby the armature is pulled into the coil.
  • the plunger connected to the anchor is thereby moved from a rest position to a release position.
  • the plunger strikes the release lever, which is thereby also moved.
  • the movement of the release lever the switching mechanism of the protective device is released, causing the coupled with the switching mechanism moving contact is moved away from the fixed contact.
  • the movement of the plunger is first transmitted to the release lever, which consequently triggers the switching mechanism, whereby the moving contact is moved away from the fixed contact.
  • a trigger mechanism with such a trigger chain is for example from the DE 10 2004 040288 B4 known.
  • the describes DE 18 40 006 U a short-circuit release for a circuit breaker with an acting both on the locking of the switching element and on the switching element itself to its acceleration magnet system.
  • the magnet system on two anchors, one of which acts on the latch or the knee joint to release the switching element and the second armature to the switching element to its acceleration.
  • the describes DE 11 28 007 B a circuit breaker with short-circuit release, consisting of a trip coil and a magnetic armature acting on a Verklinkungs adopted formed as a bridge switching member which is connected to a coil.
  • the coil is provided with a lug, which acts on the Verklinkungs worn of the switching element.
  • the triggering mechanism according to the invention for a protective switching device has a movable contact which can be locked by means of a switching mechanism, a plunger and a triggering lever.
  • the plunger is provided both for actuating the release lever of the moving contact provided release lever as well as for actuating the moving contact itself.
  • the plunger on a first active surface, which acts in a first phase of its actuation movement for unlatching the switching mechanism to a control contour of the release lever.
  • the plunger has a second active surface, which acts directly on the moving contact in a second phase of its actuating movement.
  • the moving contact between the plunger and the control contour of the release lever is arranged.
  • first active surface and the second active surface of the plunger are formed in the direction of its actuating movement at different, mutually offset positions of the plunger. Due to the staggered arrangement of the two active surfaces, a time-shifted action of the plunger on the release lever or the moving contact is realized by simple means.
  • Plunger and release lever are components of a magnetic release system, which in case of a short circuit a Switching contact of the protective switching device, which is formed by the fixed contact and the moving contact, opens by the moving contact is moved away from the fixed contact. Due to the mechanical arrangement of the moving contact between the plunger and the control contour of the release lever, it is possible to move moving contact and fixed contact closer together, whereby a higher Lorentz force between the two, substantially parallel sections of the moving contact and the fixed contact is achieved. In this way, the effect of dynamic contact opening is significantly improved. Further, since the dynamic contact opening takes place in time before the relatively sluggish magnetic trip system, a significant reduction in the residence time of the arc occurring when opening the switch contact at the contact points can be realized. In this way, the contact erosion is reduced to fixed contact and moving contact, whereby the switching capacity, but above all the service life of the protective device are significantly improved.
  • the trigger mechanism according to the invention has no chain of action plunger trigger lever moving contact in the conventional sense. Rather, the plunger is intended to act on the one hand on its first effective area directly on the release lever. On the other hand, the plunger via its second effective area but also acts directly on the moving contact itself. In this case, it must be ensured that the plunger first strikes the release lever to effect unlatching of the switching mechanism and thus release of the locking of the moving contact, before the plunger acts on the moving contact itself to effect a direct opening of the switching contact.
  • the moving contact has an opening through which the plunger partially engages in order to act on the control contour of the release lever.
  • the plunger can reach through the moving contact to act with the first effective area on the arranged behind the opening control contour of the release lever.
  • the trigger mechanism of the plunger is electromagnetically movable by means of a coil.
  • the coil can be provided with appropriate design an optimal operating force for both active operations - on the release lever on the one hand and the moving contact on the other.
  • the release lever is connected to release a mechanically coupled to the moving contact pawl.
  • the moving contact with a fixed contact of the protective switching device forms a switching contact, wherein the moving contact in the case of a dynamic contact opening of the switching contact acts on the trigger lever, thereby causing a unlatching of the switching mechanism is effected.
  • a direct unlatching of the switching mechanism is effected even in the dynamic contact opening by the movement of the Bewegmass due to the caused by the short-circuit current Lorentz force, ie it must not only the movement of the inertial plunger of the magnetic release system for unlatching the switching mechanism to be awaited.
  • the switching capacity of the protective switching device is thereby further improved.
  • the protective switching device according to the invention has a triggering mechanism according to the invention of the type described above. With regard to the advantages of the protective switching device according to the invention, reference is made to the advantages of the triggering mechanism according to the invention.
  • FIGS 1A and 1B are a tripping mechanism known in the art ( 1B ) and a corresponding protective switching device 1 ( 1A ) shown schematically.
  • the protective switching device 1 has an electrical switching contact, consisting of a fixed contact 4 and a movable relative to moving contact 5, on. By a rotational movement of the rotatably mounted moving contact 5, this is moved away from the fixed contact 4 in the counterclockwise direction, so that the switching contact is opened.
  • the protective switching device 1 has an actuating element 3, which is mechanically coupled via a bracket 21 with a switching mechanism of the protective switching device 1.
  • the actuator 3 In the presentation of the Figure 1A the actuator 3 is shown in its ON position - the switch contact is closed.
  • the moving contact 5 is mechanically coupled to the switching mechanism, so that by means of the actuating element 3, a manually initiated opening and closing of the switching contact by a corresponding movement of the moving contact 5 can be realized.
  • the protection device 1 with an electrical line to be monitored (not shown) can be contacted electrically.
  • the protective switching device 1 For detecting and switching off a short-circuit current, the protective switching device 1 has a magnetic release mechanism 10, which in turn has a coil 11 and a relatively movable plunger 12.
  • the fixed contact 4 is connected via a magnetic yoke 16 to the coil 11 electrically conductive.
  • the plunger 12 forms with an armature 13, a so-called armature plunger assembly, which is movably mounted within the bobbin 11 and when energizing the coil 11 due to the force acting on the armature 13 electromagnetic forces in a longitudinal direction L of the coil 11 is movable , In the case of a short circuit, the armature 13 is pulled in the longitudinal direction L in the bobbin 11.
  • FIG. 1B shows a detailed section (DD in 1A ) of the magnetic release mechanism 10.
  • the plunger 12 which forms an anchor-plunger assembly together with the armature 13, slidably disposed in the longitudinal direction L.
  • a magnetic core 15 is fixedly arranged in the bobbin 11. If the coil 11 is energized, the armature plunger assembly is linearly moved in the longitudinal direction L. In this case, the plunger 12 strikes a control contour 7 of the release lever 6. This is thereby also moved in the longitudinal direction L and strikes the moving contact 5, which thereby also in the longitudinal direction L - and thus away from the fixed contact 4 - is moved.
  • an armature spring 14 is provided, which is supported stationary and the armature 13 and thus the armature plunger assembly urges back to the starting position. Based on the presentation of the FIG. 1B it is clear that the plunger 12 first meets the trigger lever 6, which in turn actuates the moving contact 5. This results in a tolerance chain, which among other things is responsible for the sluggish reaction of this chain of action. A dynamic one Unlatching is not feasible in this arrangement, since the release lever 6 is not controlled by the moving contact 5.
  • FIGS. 2A and 2B show schematically the triggering mechanism according to the invention ( 2B ) as well as the protective switching device 1 according to the invention ( 2A ).
  • the protective switching device 1 in turn has two connection terminals 2, which can be electrically contacted by means of which it is to be monitored with an electrical line (not shown).
  • the current from the terminal 2 shown on the left is guided via the coil 11 of the magnetic release mechanism 10 and the magnetic yoke 16 to the fixed contact 4.
  • the switch contact is closed, the current continues to flow via the moving contact 5 and a bimetal element 22, which is part of an overload release, to the terminal 2 shown on the right.
  • FIG. 2B provides a detailed section (CC in 2A It is clear that the control contour 7 of the release lever 6 is no longer arranged as in the prior art between fixed contact 4 and moving contact 5, but in the longitudinal direction L behind the moving contact 5.
  • This arrangement allows a spatially closer arrangement of fixed contact 4 and moving contact 5, so that in the strom mallfossenen state, a higher Lorentz force between the two, substantially parallel sections of the moving contact and the fixed contact is achieved.
  • Due to the substantially parallel current flow in the region of the switching contact a Lorenz force is generated due to the guided in parallel, in the set direction by the short-circuit current conductor, which is directed such that the parallel adjacent conductors are pressed apart.
  • the moving contact 5 has an opening 8, through which the plunger 12 is guided with its end facing away from the armature 13 in the event of a short-circuit release.
  • a first active surface 17 is formed, which cooperates in the case of short-circuit release with the control contour 7 of the trigger lever 6 to effect a release of the switching mechanism of the protection device 1 by operating the trigger lever 6.
  • the plunger has a second active surface 18 in the form of a shoulder. About this second active surface 18 of the plunger 12 acts in the case of short-circuit release directly on the moving contact 5 a.
  • the paragraph 18 proposes directly on the moving contact 5, in order to prevent welding of fixed contact 4 and moving contact 5 in the event of a short circuit.
  • Both due to this transmitted by the plunger 12 of the magnetic release mechanism 10 on the moving contact 5 pulse, as well as acting due to the dynamic contact opening Lorentz force of the moving contact 5 is set in the longitudinal direction L in motion. He strikes the trigger lever 6 arranged behind it, whereby a unlatching of the switching mechanism of the protective device is also initiated. That is, in the case of the dynamic contact opening, a release of the switching mechanism is already initiated by the dynamic lifting of the moving contact 5 from the fixed contact 4, without requiring a corresponding movement of the inertial plunger 12 of the magnetic release mechanism 10 is required. The switching capacity is significantly improved.

Claims (6)

  1. Mécanisme de déclenchement (10) pour un disjoncteur de protection (1),
    - avec un contact mobile (5) pouvant être bloqué au moyen d'un mécanisme de commutation, un poussoir (12) et un levier de déclenchement (6),
    - dans lequel le poussoir (12) est prévu non seulement pour actionner le levier de déclenchement (6) prévu pour déverrouiller le contact mobile (5), mais aussi pour actionner le contact mobile (5) lui-même,
    - dans lequel le poussoir (12) présente une première surface active (17) qui, dans une première phase de son mouvement d'actionnement, agit sur un contour de commande (7) du levier de déclenchement (6) pour libérer le mécanisme de commutation,
    - dans lequel le poussoir (12) présente une deuxième surface active (18) qui, dans une deuxième phase de son mouvement d'actionnement, agit directement sur le contact mobile (5), et
    - dans lequel le contact mobile (5) est agencé entre le poussoir (12) et le contour de commande (7) du levier de déclenchement (6),
    caractérisé en ce que
    - la première surface active (17) et la deuxième surface active (18) du poussoir (12) étant réalisées en direction de son mouvement d'actionnement en différents endroits du poussoir (12) décalés l'un par rapport à l'autre.
  2. Mécanisme de déclenchement (10) selon la revendication 1, dans lequel le contact mobile (5) présente une ouverture (8) que le poussoir (12) traverse partiellement pour agir sur le contour de commande (7) du levier de déclenchement (6).
  3. Mécanisme de déclenchement (10) selon l'une des revendications précédentes, dans lequel le poussoir (12) peut être déplacé électromagnétiquement à l'aide d'une bobine (11).
  4. Mécanisme de déclenchement (10) selon l'une des revendications précédentes, dans lequel le levier de déclenchement (6) est relié pour libérer un cliquet (9) couplé mécaniquement au contact mobile (5).
  5. Mécanisme de déclenchement (10) selon l'une des revendications précédentes, dans lequel le contact mobile (5) forme un contact de commutation avec un contact fixe (4) du disjoncteur de protection (1), le contact mobile (5) agissant de manière telle sur le levier de déclenchement (6), en cas d'ouverture dynamique du contact de commutation, que cela entraîne une libération du mécanisme de commutation.
  6. Disjoncteur de protection électromécanique (1) qui comporte un mécanisme de déclenchement (10) selon l'une des revendications 1 à 5.
EP13161264.0A 2012-06-25 2013-03-27 Mécanisme de déclenchement Active EP2680293B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012210745.2A DE102012210745A1 (de) 2012-06-25 2012-06-25 Auslösemechanismus

Publications (2)

Publication Number Publication Date
EP2680293A1 EP2680293A1 (fr) 2014-01-01
EP2680293B1 true EP2680293B1 (fr) 2017-04-26

Family

ID=47997167

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13161264.0A Active EP2680293B1 (fr) 2012-06-25 2013-03-27 Mécanisme de déclenchement

Country Status (3)

Country Link
EP (1) EP2680293B1 (fr)
CN (1) CN103515160B (fr)
DE (1) DE102012210745A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2602968A (en) * 2021-01-20 2022-07-27 Eaton Intelligent Power Ltd Moving contact oscillating damper

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE506077A (fr) * 1950-10-02
DE1840006U (de) * 1960-10-22 1961-10-26 Continental Elektro Ind Ag Kurzschlussausloeser fuer leistungsschalter, insbesondere leitungsschutzschalter.
DE1128007B (de) * 1961-03-04 1962-04-19 Continental Elektro Ind Ag Leitungsschutzschalter
DE3937546A1 (de) * 1989-11-10 1991-05-16 Kopp Gmbh & Co Kg Heinrich Mobiles schutzschaltgeraet mit differenzstrom- und unterspannungsausloesung
EP0669633B1 (fr) * 1994-02-25 1999-09-29 Schneider Electric Industries SA Appareil interrupteur de protection
DE19960755A1 (de) * 1999-12-16 2001-07-05 Ellenberger & Poensgen Simulationsschalter
DE102004040288B4 (de) * 2004-08-19 2007-09-20 Siemens Ag Schutzschalter mit Kurzschluss- und Überlastauslöseanzeige sowie entsprechendes Verfahren
DE102006027140A1 (de) * 2006-06-12 2007-12-13 Ellenberger & Poensgen Gmbh Schutzschalter
DE102006037225A1 (de) * 2006-08-09 2008-02-14 Siemens Ag Schalt-Einheit
DE102006055936A1 (de) * 2006-11-27 2008-06-12 Siemens Ag Selektiver Leitungsschutzschalter
DE502009000248D1 (en) * 2008-04-02 2011-02-10 Siemens Ag Auslösemechanismus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2680293A1 (fr) 2014-01-01
CN103515160B (zh) 2017-04-19
DE102012210745A1 (de) 2014-01-02
CN103515160A (zh) 2014-01-15

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