WO1989007327A1 - Dispositif de commutation electrique - Google Patents

Dispositif de commutation electrique Download PDF

Info

Publication number
WO1989007327A1
WO1989007327A1 PCT/SE1989/000047 SE8900047W WO8907327A1 WO 1989007327 A1 WO1989007327 A1 WO 1989007327A1 SE 8900047 W SE8900047 W SE 8900047W WO 8907327 A1 WO8907327 A1 WO 8907327A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact
switching device
electric switching
movable
magnetic circuit
Prior art date
Application number
PCT/SE1989/000047
Other languages
English (en)
Inventor
Tomas Hansson
Per-Olof Karlström
Original Assignee
Asea Brown Boveri Ab
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 Asea Brown Boveri Ab filed Critical Asea Brown Boveri Ab
Publication of WO1989007327A1 publication Critical patent/WO1989007327A1/fr

Links

Classifications

    • 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
    • H01H77/10—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 electrodynamic opening
    • H01H77/101—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 electrodynamic opening with increasing of contact pressure by electrodynamic forces before opening
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H89/00—Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass
    • H01H89/06—Combination of a manual reset circuit with a contactor, i.e. the same circuit controlled by both a protective and a remote control device
    • H01H89/08—Combination of a manual reset circuit with a contactor, i.e. the same circuit controlled by both a protective and a remote control device with both devices using the same contact pair

Definitions

  • the present invention relates to an electric switching devi ⁇ ce of the kind described in the preamble to claim 1.
  • the invention is primarily intended for use in different types of electric switching devices such as contactors, load switches, etc., for low voltage (up to a rated operating voltage of 1000 V) .
  • inter ⁇ national standards IEC 158-1
  • IEC 158-1 For contactors and other electric switching devices which are intended to be connected into a motor circuit, inter ⁇ national standards (IEC 158-1) require weldless contacts in the direct on-line current region of the motor (up to about 10 times the rated current).
  • IEC 158-1 it is de ⁇ sirable that contact welding be avoided also in connection with a short-circuit.
  • a contactor is previously known in which the movable contact is supported by a rotatably journalled contact carrier which is connected to an opera ⁇ ting magnet, the movable contact being movable in relation to the contact carrier against the action of a contact pres ⁇ sure spring.
  • the contactor is provided with a magnetic circuit, excited by the current through the contacts, consisting of a core which is rigidly connected to the contact carrier, and an armature which is rigidly connected to the movable contact.
  • the spring force of the contact pressure springs can be reduced, and therefore a smaller size of the operating magnet can be chosen, which entails savings of costs.
  • a drawback with the known design is that the magnetic core which is rigidly connected to the contact carrier gives a considerable increase of the mass of the movable contact system which, upon closing, impinges against the core of the operating magnet. This causes major wear of the pole surfaces, increased propensity to contact bouncing, etc.
  • a contactor comprising a transversally movable contact bridge, arranged between two fixed contacts, the contact bridge being influ- enced by a contact pressure-increasing magnetic circuit.
  • the core of the magnetic circuit is rigidly connected to the contact carrier by means of mecha ⁇ nically rigid joints. This means that the device exhibits the same drawbacks as the device described above.
  • the possibility of blowing out the arc in the extinguishing chamber of the contactor with the aid of the magnetic field generated by the current is eliminated.
  • the contact pressure-increasing magnets shield the field around the contact unit, and another reason is that with this location of the magnets it is neces ⁇ sary to design the contacts in such a way that the current passes right through the magnetic circuit and not in a loop- shaped path, which would have given a blowing of the arc tow- ards the set of quenching laminations.
  • the object of the present invention is to provide an electric switching device with a current-depending contact pressure increasing magnetic circuit, which prevents contact separa ⁇ tion in the critical overcurrent range up to about 30 times the rated current, but which at the same time enables the switching device to be used for breaking of currents up to the limit which is determined by the breaking capacity of the device.
  • the switching device is to be designed so as to avoid the above-mentioned drawbacks of comparable prior art designs. This is achieved according to the present invention by an electric switching device with the characte ⁇ ristic features described in the characterizing part of claim 1.
  • Figure 1 shows a contactor, designed according to the invention, in longitudinal section
  • Figure 2 shows half of the same contactor in cross section along the line II-II in Figure 1 ,
  • Figure 3 is a perspective view of the contact assem ⁇ bly of the contactor
  • Figures 4 and 5 show on an enlarged scale the central part of the movable contact assembly in cross section and longitudinal section, respecti ⁇ vely,
  • Figure 6 shows schematically a magnetic circuit arranged around the movable contact of the contactor, and the associated magnetic field configuration
  • Figure 7 shows curves of the forces acting on the movable contact assembly as a function of the current
  • Figure 8 shows a tripping curve for a fuse which is connected in series with the contact
  • Figures 9 and 10 show the central part of an alternative embodiment of the movable contact assembly, in cross section and longitudinal section, respectively.
  • the contactor shown in Figures 1 and 2 is of three-pole de ⁇ sign and has a rated voltage of, for example, 660 V.
  • the rated current of the contact may, for example, lie in the range 100 - 1000 A.
  • the contactor is built up on a stand 1 of pressure-cast light metal.
  • the stand 1 supports a holder 2 of plastic with connecting bars 3, 4 for connection of the contactor into an external main circuit.
  • the contact means of the contactor which in the drawing is shown in the open position, is surrounded by an arc chute 5 of plastic provided with extinction plates 6.
  • the contact means comprises, in each pole, two electrically series- connected breaking units, which are each arranged in a res- pective extinguishing chamber 7, 8 formed in the arc chute 5.
  • Each breaking unit has a fixed contact 9 and 10, res ⁇ pectively, which is fixed to the connecting bar 3 and 4, res ⁇ pectively.
  • the fixed contacts In closed contact position, the fixed contacts are connected to each other through a contact bridge consis- ting of a movable contact 11 and an iron mounting 12, posi ⁇ tioned on top of the movable contact, for mechanical stiffe ⁇ ning of the contact.
  • the contact bridge is mounted in an opening 13 in a contact carrier 14 which is connected to the armature 15 of the ope- rating magnet of the contactor, the magnetic core and coil of the operating magnet being designated 16 and 17, respec ⁇ tively.
  • the armature 15 is influenced by opening springs 18, only one of which is shown. When the coil 17 is de-energized, these springs 18 bias the armature 15 to the position shown in Figures 1 and 2.
  • the contact bridge 11, 12 passes between the legs 19 of a U-shaped yoke 20 ( Figure 3) arranged in the contact carrier 14. The free ends of the legs 19 of the yoke 20 are interconnected through a pin 21. Between this pin 21 and the movable contact bridge 11, 12, a leaf spring 22 is mounted.
  • a contact pressure spring 23 is arranged in the yoke 20.
  • The- movable contact 11 is surrounded by a magnetic circuit consisting of a magnetic core 25, which is fixed to the con ⁇ tact carrier 14, and a magnet armature 26 which is fixedly mounted to the movable contact 11.
  • a magnetic circuit consisting of a magnetic core 25, which is fixed to the con ⁇ tact carrier 14, and a magnet armature 26 which is fixedly mounted to the movable contact 11.
  • the fixation of the magnetic core 25 is brought about by the contact pressure spring 23 keeping the magnetic core 25 pressed against a collar 24 in the contact carrier 14.
  • the yoke 20 is axially movable in the contact carrier 14 against the action of the springs 22 and 23.
  • This attraction force is composed of a relatively great force Fa.i between the core 25 and the armature 26 and a smaller force Fa2elle between the core 25 and the contact 11.
  • the attraction force F 3. cooperates with the static spring force F exerted by the springs 22 and 23.
  • the contact bridge is influenced by an electrodynamic repul ⁇ sion force Fr.
  • mag ⁇ netic core 25 has been designed with a larger cross-sectional area in the bottom part 25a than in the legs 25b. In this way, F _ will increase with the current.
  • Figure 7 shows how the above forces F3., FS and F•£ , acting on the contact bridge, vary as a function of the instantaneous value i of the current.
  • the diagram shows the "lifting current" im of the contact assembly,' i.e. the current value at which contact separation occurs. As will be seen, this value is considerably higher than the lifting current i of a corresponding contact assembly without the magnetic cir ⁇ cuit 25, 26.
  • Figure 8 shows the tripping curve of a fuse intended for series connection with the contactor, i.e. the tripping time t as a function of the R.M.S. value I of the current.
  • the current scale in Figure 8 is then directly comparable with the current scale in Figure 7.
  • contact separation occurs at the current I ? .
  • the fuse has a tripping time t during which burns on contacts and possibly contact welding may occur before the current is broken.
  • the lifting current I is considerably higher, and at this current the tripping time tm of the fuse is so short ( ⁇ 50 ms) that', if contact separation at all occurs before the current is broken, no fusion of the material in the contact surfaces - or only greatly reduced fusion - will occur.
  • Figures 9 and 10 show an alternative embodiment of the central part of the movable contact assembly.
  • the con ⁇ tact pressure spring 23 is arranged on the upper side of the movable spring 11, and the magnetic core 25 is retained against the stop 24 of the contact carrier with the aid of a separate spring 27, which supports against the armature 15 of the operating magnet.
  • the design according to Figures 9 and 10 do not differ significantly from that shown in Figures 4 and 5 and operates, in principle, in the same way as this.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Contacts (AREA)
  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

Le dispositif de commutation électrique de l'invention comprend au moins un contact fixe et un mobile (9 et 11 respectivement), le contact mobile (11) étant actionné par un ressort (23) de pression de contact et pouvant être déplacé à l'aide d'un support de contact (14), mobile par rapport au contact mobile. Le dispositif de commutation électrique comporte un circuit magnétique, magnétisé par le courant passant à travers les contacts, afin d'augmenter la pression de contact à des courants élevés. Le circuit magnétique comprend un noyau (25) fixé audit support de contact (14) à l'aide du ressort de pression de contact, ainsi qu'un induit (26) relié rigidement au contact mobile (11).
PCT/SE1989/000047 1988-02-08 1989-02-07 Dispositif de commutation electrique WO1989007327A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8800398-3 1988-02-08
SE8800398A SE460812B (sv) 1988-02-08 1988-02-08 Elkopplare

Publications (1)

Publication Number Publication Date
WO1989007327A1 true WO1989007327A1 (fr) 1989-08-10

Family

ID=20371295

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1989/000047 WO1989007327A1 (fr) 1988-02-08 1989-02-07 Dispositif de commutation electrique

Country Status (2)

Country Link
SE (1) SE460812B (fr)
WO (1) WO1989007327A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998048436A1 (fr) * 1997-04-18 1998-10-29 Siemens Aktiengesellschaft Appareil de commutation electromagnetique
DE19724710B4 (de) * 1996-07-30 2007-04-12 Schneider Electric S.A. Schaltgerät des Typs Schaltschütz
WO2014207111A1 (fr) * 2013-06-27 2014-12-31 Schneider Electric Industries Sas Contacteur electrique et procede de commande d'un tel contacteur

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079977A1 (fr) * 1981-11-21 1983-06-01 Sprecher & Schuh AG Pièce de contact pour interrupteur électrique, en particulier pour interrupteur de protection
US4513270A (en) * 1981-11-30 1985-04-23 La Telemecanique Electrique Contactor having self-protection means against the effect of the forces of repulsion between the contacts
US4593260A (en) * 1984-02-03 1986-06-03 La Telemecanique Electrique Contact with a magnetic compensator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0079977A1 (fr) * 1981-11-21 1983-06-01 Sprecher & Schuh AG Pièce de contact pour interrupteur électrique, en particulier pour interrupteur de protection
US4513270A (en) * 1981-11-30 1985-04-23 La Telemecanique Electrique Contactor having self-protection means against the effect of the forces of repulsion between the contacts
US4593260A (en) * 1984-02-03 1986-06-03 La Telemecanique Electrique Contact with a magnetic compensator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19724710B4 (de) * 1996-07-30 2007-04-12 Schneider Electric S.A. Schaltgerät des Typs Schaltschütz
WO1998048436A1 (fr) * 1997-04-18 1998-10-29 Siemens Aktiengesellschaft Appareil de commutation electromagnetique
WO2014207111A1 (fr) * 2013-06-27 2014-12-31 Schneider Electric Industries Sas Contacteur electrique et procede de commande d'un tel contacteur
FR3007888A1 (fr) * 2013-06-27 2015-01-02 Schneider Electric Ind Sas Contacteur electrique et procede de commande d'un tel contacteur

Also Published As

Publication number Publication date
SE8800398D0 (sv) 1988-02-08
SE8800398L (sv) 1989-08-09
SE460812B (sv) 1989-11-20

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