EP0255016B1 - Strombegrenzendes Schaltelement - Google Patents

Strombegrenzendes Schaltelement Download PDF

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Publication number
EP0255016B1
EP0255016B1 EP87110495A EP87110495A EP0255016B1 EP 0255016 B1 EP0255016 B1 EP 0255016B1 EP 87110495 A EP87110495 A EP 87110495A EP 87110495 A EP87110495 A EP 87110495A EP 0255016 B1 EP0255016 B1 EP 0255016B1
Authority
EP
European Patent Office
Prior art keywords
current
magnetic field
contact element
moving contact
auxiliary magnetic
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.)
Expired - Lifetime
Application number
EP87110495A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0255016A1 (de
Inventor
Johann Dipl.-Ing. Wolf
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
Priority to AT87110495T priority Critical patent/ATE85456T1/de
Publication of EP0255016A1 publication Critical patent/EP0255016A1/de
Application granted granted Critical
Publication of EP0255016B1 publication Critical patent/EP0255016B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2066—Fork-shaped bridge; Two transversally connected contact arms bridging two fixed contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
    • H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet

Definitions

  • the invention relates to a current-limiting switching device, in which a magnetic release causes a contact opening, in detail according to the preamble of claim 1.
  • a current-limiting switching device is known (DE-C-942 455).
  • electromagnets excited by the short-circuit current work there on contact blocking elements, which block the movable contact pieces in the raised position before the final switch-off position against falling back into the switch-on position.
  • An electrical switch which redirects its operating current from main contacts to an auxiliary contact and provides an auxiliary magnetic field in the manner of a so-called blow magnetic field (US Pat. No. 2,555,799).
  • the known arrangement is one of the variously known arrangements under the type of arc running aids.
  • switchgear The most important prerequisite for current-limiting switchgear is a quick contact opening that starts early. In switchgear, this is usually achieved using a fast magnet armature system.
  • the magnetic armature system often strikes the movable contact element before a switch lock is released.
  • electrodynamic forces In order to accelerate the arcing, it is also common to apply electrodynamic forces to the moving contact.
  • Such measures are also used as arcing aids.
  • the effective magnetic field at the contact point is additionally reinforced by iron brackets, iron plates or so-called blow coils. This allows an arc to enter the quenching chamber more quickly.
  • the actual center of magnetic force generation, the magnetic release is usually located relatively away from the contact point.
  • the invention has for its object to develop a current-limiting switching element or switching device that exerts strong opening forces on a movable contact member and can be used both with and without arcing chambers.
  • the magnetic trigger itself serves as a device for the auxiliary magnetic field.
  • the axis of its excitation winding lies at least approximately in the direction of movement of the movable contact member and the current direction to the contact is selected such that the adjacent one Contact member experiences a repulsive force from the fixed contact member with respect to the auxiliary magnetic field.
  • the magnetic field of the magnetic release system which is already available for the switching device, is used directly or as a stray field for the arc movement and for quick contact opening.
  • the movable contact member is movably mounted directly in the magnetic field of the release and the current direction in the movable contact is opposite to that of the coil current.
  • the auxiliary magnetic field can be part of a magnet armature circuit, as a result of which the central point for the greatest magnetic force development can act directly on the contacts located spatially close to it.
  • the magnet armature can be operatively connected to the movable contact member in a manner known per se, whereby an impact armature effect is used.
  • a particularly strong force effect is achieved on the movable contact member since two contact pieces for two contacts are formed on a common movable contact member which extends at least approximately in a plane perpendicular to the axis of the device for the auxiliary magnetic field.
  • Such a contact member can grasp the magnet arrangement in a U-shape or in a crescent shape.
  • the movable contact member offers opening forces a large surface area.
  • the extinguishing plates can be arranged in planes spanned perpendicular to the magnetic field, so that a compact construction results in a switching device with an extinguishing chamber.
  • the direction of movement of the movable contact member does not run in the direction of the auxiliary magnetic field, but perpendicular to it.
  • quenching plates can only be arranged within an auxiliary winding or at an offset level, which leads to a voluminous structure.
  • the common movable contact member can also form several turns around the auxiliary magnetic field, whereby the force effect is further increased.
  • the central magnetic field of the magnetic release system then acts on several turns, which increases the force effect.
  • Mechanisms with a dead center position as are known per se (for example FR-A-1 551 832) and by means of restraining devices, as will be described in more detail, can effect the effect of the magnetic force for opening the contact in a manner known per se be dosed.
  • the contact members carry contact pieces 5.
  • the axis of a device for generating an auxiliary magnetic field 7 is oriented perpendicular to the direction of extension of the movable contact member 3 when it contacts its closed position.
  • the direction of movement of the is approximately in the direction of the axis of the device for generating the auxiliary magnetic field 7 movable contact member 3.
  • the direction of current via the connecting conductor 8, in the direction of arrow 9, is selected so that the movable contact member 3 experiences a repelling force with respect to the auxiliary magnetic field 7 from the fixed contact member.
  • the device for the auxiliary magnetic field 7 consists of an electromagnet, the winding 10 of which is provided with connections 11, and of a magnetic yoke body 12 which leads the field back to the core 13.
  • the magnetic field 7 has an opening effect on the current at a flow direction 9 if the magnetic field with its imaginary axis 14 has a north pole above the plane of the drawing.
  • the legs of the movable contact member common to two contacts 1, 2 carry contact pieces 5 and form 4 U-shaped legs or a current loop with the fixed contact members.
  • a force is exerted on the arc in the direction of the imaginary U-axis, namely in the direction of the U-bottom.
  • Extinguishing plates of an arc chamber 15 can therefore be arranged in the running direction of the arc.
  • the connecting rail 8 also acts as a running rail, and a second running rail 16 can be arranged above the lower running rail.
  • Such quenching chambers 15 can be arranged to both contacts.
  • Magnetic stray fields in the contact area support the arc entry into the quenching chamber, whereby a force is exerted on the arc that is perpendicular to the current direction in the arc and perpendicular to the stray magnetic field in the contact area.
  • the current supply to the contacts can be designed as a series connection for winding the electromagnet.
  • the movable contact member 3 for the two contacts can be pivoted about a mechanical axis 17 in the exemplary embodiment.
  • the two contact points act open as a double break in the circuit between the connecting rails 8.
  • a common movable contact member 3 for two contact points is arranged in a plane approximately perpendicular to the axis 14 of the device for generating the auxiliary magnetic field.
  • the fixed contact members form together with the common movable contact member 3 in the contact area U-shaped legs.
  • the power supply and discharge could also be designed differently geometrically if an arc running aid of the type already described is not required.
  • the legs of the U-shaped or crescent-shaped common contact member 3 should end in the magnet area, that is to say, for example, be short. Nevertheless, the movable contact member can be guided in several turns around the axis 14 of the auxiliary magnetic field 7, as is illustrated in FIG. 3.
  • the movable contact element 3 according to FIG. 2 or according to FIG. 3 can either be translationally movable approximately in the direction of the axis 14 of the device for generating the auxiliary magnetic field 7 of the magnetic field axis 14 or also about an axis in the plane in which the movable contact element 3 according to FIG. 2 extends rotatably. As a result, the ends of the common movable contact member 3 can be moved approximately again in the direction of the magnetic field axis.
  • the magnetic field is amplified in the arrangement according to the invention by the current flow in the fixed contact members 4.
  • FIG Device 6 for the auxiliary magnetic field is part of a magnet armature circuit 18, the magnet armature 22 of which is operatively connected to the movable contact member 3 by a plunger 19 having an opening action on a part 20 intended to be connected to the movable contact members 3.
  • the contact points are arranged in partial chambers 21 made of electrically insulating wall material.
  • the device 6 for the auxiliary magnetic field is an electromagnet, for the excitation winding 10 two contacts are connected in series with a common movable contact member 3.
  • the magnet armature 22 according to FIG. 4 is acted upon by a restraint device and the movable contact member 3 is guided by a mechanism which has a dead center position before the opening path.
  • the restraining forces should be set so that currents with amperage to be switched off are sufficient to move the armature past its dead center position. This prevents undesired opening of the switch too early, and yet the strong magnetic opening forces are used from a threshold value.
  • the capturing device is designed such that the magnet armature 22 is only released in the closing direction of the movable contact member after a time after which contact welding is excluded. This prevents the contacts from closing too early, so that the contact pieces cannot weld.

Landscapes

  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Control Of Eletrric Generators (AREA)
  • Keying Circuit Devices (AREA)
  • Relay Circuits (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Air Bags (AREA)
EP87110495A 1986-07-31 1987-07-20 Strombegrenzendes Schaltelement Expired - Lifetime EP0255016B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87110495T ATE85456T1 (de) 1986-07-31 1987-07-20 Strombegrenzendes schaltelement.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3625998 1986-07-31
DE3625998 1986-07-31

Publications (2)

Publication Number Publication Date
EP0255016A1 EP0255016A1 (de) 1988-02-03
EP0255016B1 true EP0255016B1 (de) 1993-02-03

Family

ID=6306442

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110495A Expired - Lifetime EP0255016B1 (de) 1986-07-31 1987-07-20 Strombegrenzendes Schaltelement

Country Status (6)

Country Link
US (1) US4810841A (no)
EP (1) EP0255016B1 (no)
JP (1) JP2718012B2 (no)
AT (1) ATE85456T1 (no)
DE (1) DE3783965D1 (no)
NO (1) NO173208C (no)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2749392B2 (ja) * 1989-09-18 1998-05-13 三菱電機株式会社 回路遮断器
JPH071657B2 (ja) * 1989-09-18 1995-01-11 三菱電機株式会社 回路遮断器
FR2652199B1 (fr) * 1989-09-19 1994-05-13 Telemecanique Dispositif interrupteur avec boucles de courant assistant le developpement de l'arc.
US5268661A (en) * 1992-09-18 1993-12-07 Westinghouse Electric Corp. Current throttle technique
EP0649155B1 (fr) * 1993-10-15 1997-04-02 Hager Electro S.A. TÔle de conduction double pour chambre de conduction d'arc de disjoncteur
ATE218244T1 (de) * 1995-03-30 2002-06-15 Tyco Electronics Corp Elektrische kontaktanordnung
US5874873A (en) * 1997-08-22 1999-02-23 Eaton Corporation Electric control apparatus
JP4334057B2 (ja) * 1999-04-15 2009-09-16 富士通コンポーネント株式会社 電磁継電器
ATE390700T1 (de) * 2003-12-22 2008-04-15 Abb Schweiz Ag Lichtbogenlöscheinrichtung für schutzschalter mit doppelunterbrechung
EP1548772A1 (de) * 2003-12-22 2005-06-29 ABB Schweiz Holding AG Lichtbogenlöscheinrichtung für Schutzschalter mit Doppelunterbrechung
FR2953979B1 (fr) * 2009-12-11 2012-10-26 Schneider Electric Ind Sas Dispositif de coupure avec circuit magnetique de renforcement
DE102011078524A1 (de) * 2011-07-01 2013-01-03 Siemens Aktiengesellschaft Doppeltunterbrechendes Schutzschaltgerät
US8947181B2 (en) 2012-11-15 2015-02-03 Eaton Corporation Arc runner assembly and circuit interrupter
JP6548905B2 (ja) * 2015-02-06 2019-07-24 富士通コンポーネント株式会社 スイッチ
US9673004B1 (en) * 2016-03-25 2017-06-06 Eaton Corporation Electrical switching apparatus, and arc chamber assembly and associated circuit protection method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1551832A (no) * 1967-01-27 1968-12-27
US3555471A (en) * 1968-02-28 1971-01-12 Vni I Pk I Electr Oapparatov Automatic breaker with coil adjustable to effect current limiting or electrodynamic blowoff compensation
FR2400761A1 (fr) * 1977-08-18 1979-03-16 Gould Inc Systeme de verrouillage anti-rebond pour des interrupteurs de limitation de courant

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942455C (de) * 1941-07-12 1956-05-03 Aeg Elektrischer UEberstromselbstschalter fuer Wechselstrom
US2555799A (en) * 1947-02-05 1951-06-05 Allis Chalmers Mfg Co Electric switch
BE487105A (no) * 1948-02-13
JPS5013957U (no) * 1973-05-31 1975-02-13
FR2242766A1 (en) * 1973-08-30 1975-03-28 Merlin Gerin Electric circuit breaker - has double fixed and moving contacts in series and double arc repulsion
JPS5335968A (en) * 1976-09-16 1978-04-03 Hitachi Ltd Electromagnetic contactor
JPS61193310A (ja) * 1985-02-20 1986-08-27 三菱電機株式会社 開閉器
JPH0443952Y2 (no) * 1985-11-25 1992-10-16

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1551832A (no) * 1967-01-27 1968-12-27
US3555471A (en) * 1968-02-28 1971-01-12 Vni I Pk I Electr Oapparatov Automatic breaker with coil adjustable to effect current limiting or electrodynamic blowoff compensation
FR2400761A1 (fr) * 1977-08-18 1979-03-16 Gould Inc Systeme de verrouillage anti-rebond pour des interrupteurs de limitation de courant

Also Published As

Publication number Publication date
NO873054L (no) 1988-02-01
EP0255016A1 (de) 1988-02-03
NO173208C (no) 1993-11-10
DE3783965D1 (de) 1993-03-18
US4810841A (en) 1989-03-07
ATE85456T1 (de) 1993-02-15
JP2718012B2 (ja) 1998-02-25
NO873054D0 (no) 1987-07-21
JPS6340226A (ja) 1988-02-20
NO173208B (no) 1993-08-02

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