EP2302657A1 - Système de limitation de courant - Google Patents

Système de limitation de courant Download PDF

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Publication number
EP2302657A1
EP2302657A1 EP09171063A EP09171063A EP2302657A1 EP 2302657 A1 EP2302657 A1 EP 2302657A1 EP 09171063 A EP09171063 A EP 09171063A EP 09171063 A EP09171063 A EP 09171063A EP 2302657 A1 EP2302657 A1 EP 2302657A1
Authority
EP
European Patent Office
Prior art keywords
contact
current limiting
current
contact piece
limiting system
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Withdrawn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
EP09171063A
Other languages
German (de)
English (en)
Inventor
Gerhard Schneider
Thomas Wulf
Tudor Baiatu
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.)
ABB Schweiz AG
Original Assignee
ABB Schweiz 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 ABB Schweiz AG filed Critical ABB Schweiz AG
Priority to EP09171063A priority Critical patent/EP2302657A1/fr
Priority to DE201020009949 priority patent/DE202010009949U1/de
Priority to ITMI20100257 priority patent/ITMI20100257U1/it
Priority to CN2010202867314U priority patent/CN201975360U/zh
Priority to FR1003218A priority patent/FR2950492B3/fr
Publication of EP2302657A1 publication Critical patent/EP2302657A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H81/00—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
    • H01H81/04—Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting electromagnetically operated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/06—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electromagnetic opening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/06—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electromagnetic opening
    • H01H77/08—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electromagnetic opening retained closed by permanent or remanent magnetism and opened by windings acting in opposition

Definitions

  • the invention relates to the field of current limiting systems according to the preamble of claim 1.
  • Such current limiting systems are typically used in series with circuit breakers or motor protection switches.
  • This known contact system has a fixed contact carrier, which is connected to a first connection conductor. Further, the contact system has a movable contact arm with an end-side movable contact piece, which is in a conductive connection with a fixed contact carrier arranged immovable contact piece under normal conditions. The contact arm is pivotable with a second connection conductor. The current flow extends from the second connection conductor, the contact arm, the movable contact piece, the fixed contact piece and the fixed contact carrier to the first connection conductor. In the movable contact arm and the fixed contact carrier, the current runs in opposite directions, whereby in the event of a short circuit, or if the current exceeds the predetermined amount, an electrodynamic force is generated which is able to push away the contact arm from the contact carrier. Once the movable contact piece is separated from the fixed contact piece, an arc between the movable contact piece and the fixed contact piece, which is passed to be deleted in a splitter stack.
  • the arc and the arc quenching plates limit the current in the event of a short circuit. In this way, it can be ensured that, in the event of a fault, a circuit breaker or motor protection switch connected downstream of the current limiting unit can interrupt the circuit to be protected by the circuit breaker or motor protection switch, in which the short circuit has occurred, as intended.
  • a disadvantage of this known current limiting system proves that it may happen that the contact system of this known current limiting system is closed again at a time at which a still considerable current flows or a considerable voltage between the fixed contact and the movable contact is applied. As a result, an arc between the fixed contact and the movable contact can ignite again when closing the contact system, whereby the fixed contact with the movable contact can weld.
  • Object of the present invention is to provide a current limiting unit, in which a welding of the contact point is prevented.
  • the opening and closing of the at least one contact can be independent of the electrodynamic repulsion. Consequently, in particular the time of closing the at least one contact can be selected independently of the electrodynamic repulsion of the first contact piece of the second contact piece, whereby a welding of the at least one contact is prevented.
  • the closing threshold value is chosen such that the electrodynamic repulsion acting between the first contact piece and the second contact piece does not hinder the closing of at least one contact. As a result, welding of the contact can be reliably prevented.
  • the force causing the at least one contact to be open acts on the second contact piece from an electromagnetic system and a mechanism cooperating with the electromagnetic system.
  • This embodiment provides a simple current limiting system by means of which welding of the at least one contact is effectively prevented.
  • This embodiment makes it possible to close the at least one contact at a time at which the risk of welding of the at least one contact is minimized or prevented.
  • the closing threshold is selected between 20% and 100%, preferably between 40% and 80% and most preferably between 55% and 65% of a threshold response. This choice of Schliesschwell learnerss prevents particularly effective welding of the at least one contact.
  • FIG. 1 shows a current limiting system 10, which is intended to be in a current limiting unit 12, as in FIG. 2 shown to be used.
  • FIG. 3 is that to the in FIG. 1 and 2 shown current circuit 10 associated circuit diagram shown.
  • the current limiting system 10 has a first connection contact 16 along a current path 14, a contact system 18 conductively connected to the first connection contact 16, and a second connection contact 20 conductively connected to the contact system 18.
  • the contact system 18 in the present embodiment is designed to be double-interrupting.
  • the contact system 18 has a first contact 19 '(see FIG. 3 ) and a second contact 19 "(see FIG. 3 ) on.
  • the first contact 19 ' is formed by a first contact piece 28 and a second contact piece 32 cooperating with the first contact piece 28 for opening and closing the first contact 19', wherein the second contact piece 32 is movable relative to the first contact piece 28.
  • the second contact 19 is analogous to the first contact 19 'and has a first contact piece 30 and a first contact piece 30 for opening and closing the second contact 19" cooperating second contact piece 34, wherein the second contact piece 34 relative to first contact piece 30 is movable.
  • the second contact piece 32 of the first contact 19 ' is formed together with the second contact piece 34 of the second contact 19 "on a contact bridge 26', wherein the second contact piece 32 of the first contact 19 'at one end and the second contact piece 34 of the second contact 19th is formed at the other end of the contact bridge 26 '.
  • FIG. 4 instead of in FIG. 1 to 3 shown double interrupting contact system 18 and a single-break contact system 18 are used. Instead of the contact bridge, a pivoting arm is used, wherein the second contact piece 28 is arranged at the freely movable end of the pivoting arm.
  • the related to FIG. 1 to 3 described contact bridge 26 'as well as in connection with FIG. 4 The pivot arm described each form a movable contact element 26.
  • the second contact piece 32 and the two second contact pieces 32, 34 may be formed integrally with the contact element 26.
  • the contact system 18 is opened by simultaneously opening the first and second contacts 19 ', 19 ". Also, the contact system 18 is closed by simultaneously closing the first and second contacts 19', 19". In the second embodiment, which in connection with FIG. 4 is described, the contact system 18 is opened and closed by opening and closing the contact 19 '. With the exception of the contact system 18, the first embodiment and the second embodiment are formed substantially the same.
  • the current path 14 between the first terminal contact 16 and the second terminal contact 20 has a substantially negligible resistance value of a few milliohms.
  • the contact system 18 is opened and, as soon as the current in the current path 14 falls below a closing threshold, closed again.
  • a current-limiting element 51 is connected in the current path 14.
  • a force acts which causes the contacts 19' 19 "are open. According to the invention, this force is different from an electrodynamic repulsion acting between the first contact piece 28, 30 and the second contact piece 32, 34 of the first contact 19 'and the second contact 19 ", respectively.
  • a force acts on the second contact piece 32 of the contact 19 ', which causes the contact 19' to be open.
  • This power is different from an acting between the first contact piece 28 and the second contact piece 32 electrodynamic repulsion.
  • the closing threshold value is preferably selected such that the electrodynamic repulsion acting between the first contact piece 28, 30 and the second contact piece 32, 34 of the two contacts 19 ', 19 "does not hinder the closing of the contacts 19', 19" or of the contact system 18.
  • this force preferably acts mechanically on the second contact pieces 32, 34 or the movable contact element 26.
  • the force is applied by an electromagnetic system 24.
  • This conductor 22 is part of the electromagnetic system 24.
  • the conductor 22 is formed by a coil 22 '.
  • the coil 22 ' cooperates with a magnetic armature, which in turn acts on the movable contact element 26 via a mechanism for opening the contact system 18.
  • a magnetic force of a permanent magnet 49 also acts on the magnet armature.
  • the coil 22 'and the armature of the An Jardinschwellwert the current limiting system can be adjusted. Further, the An Jardinschwellwert can be adjusted by a between the permanent magnet 49 and the magnet armature possibly present minimum distance.
  • the armature is, if the current does not exceed the Anschwellwert, tied in a first position to the permanent magnet 49. In the first position of the armature, the electromagnetic system 24 does not act on the contact system 18. If the current exceeds the threshold, the armature will move from its first position to a second position. As soon as the armature of the Moving away from the permanent magnets 49, the magnetic field of the permanent magnet 49 drops rapidly, so that the force of the electromagnetic system 24 can be used to open the contact system 18. To open the contact system 18, the magnet armature acts on the second contact pieces 32, 34 of the first and second contact 19 ', 19 "via the mechanism 47. As soon as the current falls below the closing threshold value, the magnetic field of the coil 22' and thus of the Magnetic arm on the mechanics 47 transmitted force so far that the contact system 18 closes again.
  • the contact element 26 is supported by a holding element 38.
  • the holding element 38 is pivotable about an axis A, which runs parallel to a web between the two legs of the U-shaped contact bridge 26 '.
  • the holding element 38 has a lever 40 forming a lever which cooperates with a spring element 42.
  • the spring element 42 is formed in the present embodiment by a coil spring (torsion spring).
  • the spring force is selected such that, when the contact system 18 is closed, the lowest possible resistance between the first connection contact 16 and the second connection contact 20 results.
  • the spring element 42 also acts in the open state of the contact system 18, that is, if the second contact pieces 32, 34 are separated from the first contact pieces 28, 30, on the holding element 38 a. As a result, a force acts on the holding element 38 and thus on the contact element 26 when the contacts 19 ', 19 "are open, which endeavors to close the contacts 19', 19" and thus the contact system 18.
  • the spring force acting on the contact element 26 or on the second contact pieces 32, 34 when the contact system 18 is open is smaller than the acting spring force when the contact system 18 is closed. This is brought about by the fact that the point of action 44 on which the spring element 42 interacts with the arm 40 of the holding element 38 moves along a straight rod extension 46 of the spring element 42 designed as a torsion spring.
  • the magnetic field of the current-carrying coil 22 ' cooperates with the magnet armature (not visible in the figures), which is arranged movably inside the coil 22'.
  • the mechanism 47 has an actuating element 48, via which the mangetanker acts on the holding element 38 to open the contact system 18.
  • the current limiting system 10 has one arc quenching device 50 per contact 19 ', 19 ".
  • Each of the arc quenching devices has a first fixed contact side arc runner 52 connected to the first contact piece 28 of the respective contact 19', 19" and a second contactor Light upper runner rail 56, which is intended to take over the arc from the second contact piece 32, 34 of the respective contact 19 ', 19 "The arc runners 52, 56 serve a between the first contact piece 28, 30 and the second contact piece 32, 34 forming arc from the respective contact 19 ', 19 "away to an arc extinguishing package 60 of the respective arc quenching device 50 to lead.
  • Such arc extinguishing packages 60 are generally known and serve, inter alia, to prevent the burnup of the contacts 19 ', 19 "In the present current limiting system 10, the arc-extinguishing devices 50 serve in particular for current limitation, ie the arc-extinguishing devices 50 or the arc burning therein forms the current-limiting element 51 form.
  • the current limiting system 10 is inserted into a housing 13 of a current limiting unit 12.
  • the current-limiting unit 12 has connection terminals, which are each electrically connected to the first connection contact 16 and the second connection contact 20.
  • a current limiting unit 12 is arranged in the housing.
  • a housing also several, in particular three Current limiting units for each phase to be arranged spatially parallel to each other.
  • a plurality of current-limiting units 12, each having a current-limiting system 10 can be arranged spatially parallel to one another. In other words, a current limiting unit 12 is provided per phase.
  • FIG. 5 and 6 two further embodiments of the inventive current limiting system 10 are shown in the diagram. These embodiments are largely related to FIG. 4 described current limiting system identical.
  • a resistance 64 which is arranged electrically parallel to the contact 19 'and / or to the contact 19 ", can be dispensed with in this case, as well as sparkling on the rails, and the resistors preferably have a resistance value between 0.5m ⁇ and 20m ⁇
  • resistors are in particular electrical resistance, which increases with increasing current intensity in question, so for example metals with a positive linear or nonlinear temperature coefficient of resistivity such as copper, iron, nickel, aluminum and alloys based on at least one of these metals, or as PTC resistor (positive temperature coefficient) known metal alloys based on Ni, Co, Fe, such as NiCr, NiMn, NiFe, NiCrMn, NiCo, NiCoFe, CoFe, CrAlFe, or even ceramic materials is based on
  • FIG. 7 to 10 Further embodiments of the inventive current limiting system 10 are shown in the diagram.
  • FIG. 11 is the according to the diagram according to FIG. 10 corresponding embodiment shown. These embodiments are largely related to FIG. 1 to 3 respectively FIG. 4 described current limiting systems 10 identical.
  • the embodiments according to FIG. 7 and 11 in turn, a resistor 64 which is arranged parallel to one or both contacts 19 ', 19 "of the double-breaking contact system 18.
  • the resistor 64 acts as the arc as a current limiting element 51, whereby the current flowing through the current limiting system 10 is limited.
  • the current-limiting element 51 can consequently be formed by the arc-quenching device 50 or by an arc and / or by a resistor 64.
  • the resistor 64 can be dispensed with the arc run rails and / or the arc extinguishing packets.
  • FIG. 4 formed embodiment is dispensed with the arc extinguishing package.
  • the current limiting system according to the invention is preferably used and operated as follows.
  • the current limiting system according to the invention serves only for short-term current limitation, but not for the continuous or continuous power interruption.
  • the current limiting system according to the invention for example, together with a circuit breaker or motor protection switch connected in series with the current limiting system, protects the circuit to be protected.
  • Circuit breakers or motor protection switches are designed to interrupt currents in the event of a fault, in particular due to a short circuit or the like in the circuit to be protected. Circuit breakers interrupt the circuit to be protected when exceeding the permissible nominal value of, for example, 32A, 63A or even 125A, whereby these current values are merely examples. However, if the current exceeds a multiple of the rated value, the operation is no longer guaranteed.
  • a current limiting system or a current limiting unit is connected in series with one or more parallel circuit breakers or motor protection switch, which limits the power in a range which the power switch or motor protection switch can manage reliably / assets.
  • the current limiting system or the current limiting unit limits the current when exceeding the An Jardinschwellepteptives the current limiting system by the current-limiting element 51, in particular an arc or a resistor is switched into the current path 14. As soon as the current drops below the closing threshold value of the current limiting system 10, the current-limiting element 51 is removed or bridged again from the current path 14.
  • the response threshold is between five and twenty times the nominal value, more preferably between ten and fifteen times the nominal value, most preferably the response threshold is about twelve to fourteen times the nominal value.
  • the Schliesschwellwert can be equal to the An Anlagenschwellwert or in particular also chosen lower.
  • the Schliesschwellwert is between five times to twelve times the nominal value.
  • the Schliesschwellwert corresponds approximately to eight times the nominal value.
  • the contact system 18 or the at least one contact 19 ', 19 "of the contact system 18 remains closed until the response threshold is reached.
  • the magnetic field caused by this current flow is so strong that the permanent magnet 49 is no longer able to tie the magnet armature in its first position. Due to the resulting magnetic field of conductor 22 and permanent magnet 49 acts on the armature a force that is directed away from the permanent magnet 49. Consequently, the armature shifts from its first position to its second position, in which the armature driven by the magnetic field of the conductor 22 or the coil 22 'acts on the actuating element 48, which in turn acts on the holding element 38, and against the force of the spring element 42, the contact system 18 opens.
  • the magnetic field caused by the current in the conductor 22 or in the coil 22' also drops.
  • the contact element 26 or the second contact piece 32, 34 of each contact 19 moves ', 19 "in the direction of the first contact piece 28, 30 of the respective contact 19', 19", whereby the contact system 18 is closed.
  • the armature shifts simultaneously from the second position back to the first position.
  • the threshold of response at which the contact system 18 opens and the closing threshold at which the contact system 18 closes may be determined.
  • the Anschwellwert is essentially determined by the choice of the electromagnetic system 24.
  • the current threshold can be determined by the choice of the conductor 22 or the coil 22 ', the magnet armature and the permanent magnet 49.
  • One in the first position between the permanent magnet and the Magnetic arm formed gap also has a decisive influence on the response threshold.
  • the response threshold at which the contact system 18 opens can be determined by the geometry of the mechanism 47, in particular by the spring element 42.
  • the closing threshold value is determined essentially by the choice of the mechanism 47 and the electromagnetic system 24, wherein the closing threshold value of the permanent magnet of the electromagnetic system has almost no influence. This allows the An Anlagenschwellwert and the Schliesschwellwert can be chosen differently, in particular, the Schliesschwellwert be chosen smaller than the An videschwellwert.
  • the closing threshold of the current limiting system is selected between 20% and 100%, preferably between 40% and 80% and most preferably between 55% and 65% of the threshold response.
  • FIG. 1 to 3 In another embodiment, not shown in the figures, this is in connection with FIG. 1 to 3 described modified electromagnetic system. In the following, only the amendments will be discussed.
  • a spring element is used instead of in FIG. 1 and 2 shown permanent magnet 49. This spring element holds the armature in its first position until the current exceeds the threshold.
EP09171063A 2009-09-23 2009-09-23 Système de limitation de courant Withdrawn EP2302657A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP09171063A EP2302657A1 (fr) 2009-09-23 2009-09-23 Système de limitation de courant
DE201020009949 DE202010009949U1 (de) 2009-09-23 2010-07-07 Strombegrenzungssystem
ITMI20100257 ITMI20100257U1 (it) 2009-09-23 2010-07-28 Sistema di limitazione della corrente
CN2010202867314U CN201975360U (zh) 2009-09-23 2010-07-30 电流限制系统、电流限制单元及电流限制单元的组件
FR1003218A FR2950492B3 (fr) 2009-09-23 2010-07-30 Systeme de limitation de courant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09171063A EP2302657A1 (fr) 2009-09-23 2009-09-23 Système de limitation de courant

Publications (1)

Publication Number Publication Date
EP2302657A1 true EP2302657A1 (fr) 2011-03-30

Family

ID=41558392

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09171063A Withdrawn EP2302657A1 (fr) 2009-09-23 2009-09-23 Système de limitation de courant

Country Status (5)

Country Link
EP (1) EP2302657A1 (fr)
CN (1) CN201975360U (fr)
DE (1) DE202010009949U1 (fr)
FR (1) FR2950492B3 (fr)
IT (1) ITMI20100257U1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2989512B1 (fr) * 2012-04-17 2014-04-25 Schneider Electric Ind Sas Ensemble de commande d'une coupure d'une ligne en cas de surintensite dans cette ligne et disjoncteur de protection contre une surintensite dans une ligne
US10629391B2 (en) * 2017-12-21 2020-04-21 Eaton Intelligent Power Limited Fusible safety disconnect in solid state circuit breakers and combination motor starters

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136921A (en) * 1957-12-10 1964-06-09 Westinghouse Electric Corp Circuit breakers
DE1183584B (de) * 1962-01-25 1964-12-17 Siemens Ag Einrichtung zur Kontakttrennung bei grossen UEberstroemen
US3956723A (en) * 1974-04-29 1976-05-11 Square D Company Current limiting circuit breaker
EP0322987A1 (fr) * 1987-12-31 1989-07-05 Holec Systemen En Componenten B.V. Interrupteur électromagnétique
DE3920546A1 (de) * 1989-06-23 1991-01-10 Kloeckner Moeller Elektrizit Hochleistungskontakt, insbesondere fuer niederspannungsschaltgeraete
EP0418755A2 (fr) * 1989-09-18 1991-03-27 Mitsubishi Denki Kabushiki Kaisha Disjoncteur limiteur de courant
DE4334577C1 (de) * 1993-10-11 1995-03-30 Kloeckner Moeller Gmbh Kontaktsystem für eine Strombegrenzungseinheit
WO2001078210A1 (fr) * 2000-04-07 2001-10-18 Siemens Aktiengesellschaft Procede de commutation destine a un appareil de commutation electromagnetique, appareil de commutation electromagnetique correspondant

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136921A (en) * 1957-12-10 1964-06-09 Westinghouse Electric Corp Circuit breakers
DE1183584B (de) * 1962-01-25 1964-12-17 Siemens Ag Einrichtung zur Kontakttrennung bei grossen UEberstroemen
US3956723A (en) * 1974-04-29 1976-05-11 Square D Company Current limiting circuit breaker
EP0322987A1 (fr) * 1987-12-31 1989-07-05 Holec Systemen En Componenten B.V. Interrupteur électromagnétique
DE3920546A1 (de) * 1989-06-23 1991-01-10 Kloeckner Moeller Elektrizit Hochleistungskontakt, insbesondere fuer niederspannungsschaltgeraete
EP0418755A2 (fr) * 1989-09-18 1991-03-27 Mitsubishi Denki Kabushiki Kaisha Disjoncteur limiteur de courant
DE4334577C1 (de) * 1993-10-11 1995-03-30 Kloeckner Moeller Gmbh Kontaktsystem für eine Strombegrenzungseinheit
EP0647958A1 (fr) 1993-10-11 1995-04-12 Moeller GmbH Système de contact pour une unité de limitation de courant
WO2001078210A1 (fr) * 2000-04-07 2001-10-18 Siemens Aktiengesellschaft Procede de commutation destine a un appareil de commutation electromagnetique, appareil de commutation electromagnetique correspondant

Also Published As

Publication number Publication date
FR2950492B3 (fr) 2011-09-16
CN201975360U (zh) 2011-09-14
ITMI20100257U1 (it) 2011-03-24
FR2950492A3 (fr) 2011-03-25
DE202010009949U1 (de) 2010-10-07

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