EP0515292B1 - Elektromagnetischer Auslöser für einen Schwachstromschalter - Google Patents

Elektromagnetischer Auslöser für einen Schwachstromschalter Download PDF

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Publication number
EP0515292B1
EP0515292B1 EP19920420161 EP92420161A EP0515292B1 EP 0515292 B1 EP0515292 B1 EP 0515292B1 EP 19920420161 EP19920420161 EP 19920420161 EP 92420161 A EP92420161 A EP 92420161A EP 0515292 B1 EP0515292 B1 EP 0515292B1
Authority
EP
European Patent Office
Prior art keywords
coil
trip device
ferromagnetic
electromagnetic trip
arc
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
EP19920420161
Other languages
English (en)
French (fr)
Other versions
EP0515292A1 (de
Inventor
Yves Belin
Robert Diconne
Didier Lebouc
Michel Perrot
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 SE
Original Assignee
Merlin Gerin SA
Schneider Electric SE
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 Merlin Gerin SA, Schneider Electric SE filed Critical Merlin Gerin SA
Publication of EP0515292A1 publication Critical patent/EP0515292A1/de
Application granted granted Critical
Publication of EP0515292B1 publication Critical patent/EP0515292B1/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
    • 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
    • H01H71/2454—Electromagnetic mechanisms characterised by the magnetic circuit or active magnetic elements
    • 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

  • a low-caliber miniature circuit breaker for example less than 3A, comprises a bimetal thermal trip device associated with a driver, and an electromagnetic trip trip device with coil comprising several tens of turns.
  • the circuit breaker behaves like a limiting device, thanks to the impedance of the pole due to the presence of the driver and the coil. This impedance can reach a few ohms, which ensures a limitation of the short-circuit current to an approximate value of 100A.
  • This current limiting effect takes place at the expense of blowing the initial arc to the arc extinguishing chamber. This results in stagnation of the arc on the contacts.
  • the high number of ampere-turns of the coil risks causing magnetic saturation of the electromagnet, despite the presence of the first ferromagnetic part of the cylinder head.
  • a strong magnetic leakage field is created around the electromagnetic trip device, which causes the arc to blow in a direction different from that of propagation towards the arc extinguishing chamber.
  • the initial arc is then drawn towards the housing compartment of the mechanism.
  • the risk of strikes between poles can compromise breaking performance.
  • the magnetic shielding effect is not perfect, and there remains the risk of a leakage magnetic field in the presence of a short circuit in a low-caliber circuit breaker.
  • the object of the invention is to improve the structure of an electromagnetic trip device to allow the correct operation of a low-caliber circuit breaker.
  • the trigger according to the invention is characterized in that the cylinder head comprises a second ferromagnetic part fixed to the first part of conjugate shape to form a total shielding member, closed on each side, and arranged around the coil and core assembly for delay the magnetic saturation of said electromagnet in the event of detection of a short-circuit current by the electromagnetic trip device, that the base of the first ferromagnetic part has two lateral and parallel flanges, staggered along the axial direction of the coil extending perpendicularly to the walls of the housing, and that the second ferromagnetic part is formed by a sheet bent in a U having a plate parallel to the arc horn of the first part, and two transverse wings pressed against the opposite internal walls of the housing, the assembly of the two parts of the cylinder head forming a straight parallelepiped enveloping said bobi born.
  • the addition to the yoke of the second ferromagnetic part causes a decrease in the return reluctance of the magnetic flux, resulting in a shift of the magnetic saturation point.
  • the magnetic field lines remain fully channeled in the iron of the magnetic circuit, which eliminates any leakage magnetic field outside the trigger.
  • a pole of a miniature electric circuit breaker 10 for low ratings, in particular less than a few amps, comprises a molded insulating housing 12 enclosing an arc quenching chamber 14, a fixed contact 16, a movable contact 18 carried by a contact arm 20 actuated by a control mechanism 22, an electromagnetic trip device 24 with striker 26 sensitive to short-circuit currents, a thermal trip device 28 sensitive to overload currents, and a lever 30 for manual control.
  • control mechanism 22 is described in detail in the patent French FR-2,616,583 of the applicant, but it is understood that any other type of mechanism can be used.
  • the mechanism 22 is controlled manually by the lever 30, and automatically by the two triggers 28,24.
  • the arc quenching chamber 14 is formed by a stack of metal deionization separators framed in the height direction in FIG. 1, by an upper arc horn 32 and a lower arc horn 34.
  • the front part of the lower bow horn 34 is arranged in a loop 36 whose end 38 opposite the chamber 14, serves as a support member for the foot 41 of the bimetallic strip 40 of the thermal trip device 28.
  • a heating element 42 is wound around the bimetallic strip 40 to allow the detection of overload currents of low intensities, for example less than or equal to 2 amperes.
  • the foot 41 of the bimetallic strip 40 is electrically connected to one of the terminals (not shown) by a conductor 44, and the opposite end of the driver 42 is electrically connected to the contact arm 20 by a flexible braid 46.
  • the electromagnetic trip device 24 occupies the entire width of the housing 12 above the chamber 14, and comprises an electromagnet with movable core 48 and with adjustable triggering threshold, as described by way of example in document EP-A -378.030 of the applicant.
  • a coil 50 of excitation of cylindrical shape is mounted coaxially on a tubular insulating sleeve 52, inside of which moves in translation the movable core 48 cooperating with a fixed core 54.
  • a trigger rod 56 passes through an axial bore 58 of the fixed core 54, and is coupled, for example by snap-fastening, to a stud 57 of the movable core 48.
  • the end of the rod 56 situated opposite the stud 57 is shaped as a striker 26 intended to cooperate with the trigger lever of the mechanism 22 to ensure the unlocking of the latching, and the automatic opening of the contacts 16, 18 of the pole.
  • the two 48,54 cores are made of material ferromagnetic, especially steel.
  • excitation coil 50 and cores 48, 54 is positioned inside a cylinder head 60 made of ferromagnetic material, ensuring total shielding of the electromagnetic trip device 24.
  • the cylinder head 60 is constituted by the assembly of two parts 62, 64 conjugated in a U shape.
  • the first lower part 62 serves to support the assembly of coil 50 and cores 48, 54, and comprises two lateral flanges 66, 68 and parallel, secured to a base merged with the upper arc horn 32 of the arc extinguishing chamber 14.
  • the lateral flanges 66, 68 are staggered along the axial direction of the sheath 52, extending perpendicularly to the arc horn 32.
  • a portion of the junction between the horn 32 and the flange 68 carries a protruding rim 70, to which the fixed contact 16 can be fixed by welding.
  • the fixed core 54 is secured to the flange 68 located on the side of the rim 70, while the movable core 48 moves in translation to the right of the opposite flange 66.
  • One end 72 of the coil 50 is welded to the flange 68 in electrical connection with the fixed contact 16.
  • the other end 74 of the coil 50 is electrically connected to a terminal (not shown) of the housing 12, located at the opposite of that associated with the conductor 44 for connecting the thermal release 28.
  • the second upper part 64 of the cylinder head 60 comprises a U-shaped sheet having a plate 76 extending parallel to the arc horn 32 with the interposition of the coil 50.
  • the plate 76 is extended by two transverse wings 78.80 plated respectively against the opposite internal walls of the housing 12, and abutting at their ends with the opposite longitudinal faces of the arcing horn 32.
  • the width of the wings 78.80 and of the plate 76 of the second part 84 corresponds to l 'axial gap separating the two flanges 66,68 of the first part 62.
  • the addition of the second part 64 on the first part 62 complementary makes it possible to obtain a ferromagnetic cylinder head 60 closed on each side, allowing total shielding of the electromagnetic trip device 24.
  • the presence of the second part 64 in the yoke 60 allows an increase in the return section of the magnetic circuit, resulting in a decrease in the return reluctance of the magnetic flux. This results in a delay in the saturation point of the magnetic circuit of the trigger 24 when a short-circuit current appears in the pole.
  • the entire magnetic field thus remains channeled in the iron of the magnetic circuit until the arc is blown towards the extinguishing chamber 14 by the action of the return gases.
  • the absence of a leakage magnetic field outside the electromagnetic trip device 24 prevents any deviation of the arc blowing direction, in particular towards the compartment of the mechanism. On multi-pole devices, any ignition between adjacent poles is thus excluded.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Claims (3)

  1. Elektromagnetischer Auslöser (24), insbesondere für einen Kleinleistungsschalter (10) mit niedrigem Nennstrom, mit einem Elektromagneten, der einen Schlagbolzen (26) sowie
    - eine Erregerspule (50), die koaxial auf einem rohrförmigen Isolierstoff-Spulenkörper (52) montiert ist, in dessem Inneren ein unter Einhaltung eines Luftspalts mit einem feststehenden ferromagnetischen Kern (54) zusammenwirkender beweglicher ferromagnetischer Kern (48) gleitend gelagert ist,
    - eine Auslösestange (56), deren erstes Ende mit dem beweglichen Kern (48) verbunden ist, und deren zweites Ende den genannten Schlagbolzen (26) trägt,
    - und ein Joch (60) zur Rückführung des magnetischen Flusses umfaßt, das ein erstes, als Tragkörper für die Baueinheit aus Spule (50) und Kernen (48, 50) dienendes ferromagnetisches Teil (62) aufweist, dessen Boden (62) als ein der angrenzenden Lichtbogenlöschkammer (14) zugeordnetes Lichtbogenführungshorn (32) ausgebildet ist,
    dadurch gekennzeichnet, daß das Joch (60) ein zweites ferromagnetisches Teil (64) umfaßt, welches auf dem ersten entsprechend geformten Teil (62) befestigt ist, um eine allseitig geschlossene und die Baueinheit aus Spule (50) und Kernen (48, 50) umgebende vollständige Abschirmung zu bilden und so bei Erfassung eines Kurzschlußstroms durch den elektromagnetischen Auslöser (24) die magnetische Sättigung des genannten Elektromagneten zu verzögern, daß der Boden des ersten ferromagnetischen Teils (62) zwei parallel angeordnete Seitenbügel (66, 68) aufweist, die in Axialrichtung der Spule (50) versetzt hintereinander angeordnet sind und sich senkrecht zur Wand des Gehäuses (12) erstrecken, und daß das zweite ferromagnetische Teil (64) aus einem U-förmig gebogenen Blech mit einer parallel zum Lichtbogenführungshorn (32) des ersten Teils (32) angeordneten Platte (76) und zwei, gegen die sich gegenüberliegenden Innenwände des Gehäuses (12) gepreßten Querflügel (78, 80) besteht, wobei durch Zusammenbau der beiden Teile (62, 64) des Jochs (60) ein die genannte Spule (50) umgebender Rechteckquader gebildet wird.
  2. Elektromagnetischer Auslöser nach Anspruch 1, dadurch gekennzeichnet, daß die Breite der Querflügel (78, 80) und der Platte (76) des zweiten Teils (64) dem axialen Abstand zwischen den beiden Seitenbügeln (66, 68) des ersten Teils (62) entspricht.
  3. Elektromagnetischer Auslöser nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Spule (50) mit einem thermischen Auslöser (28) mit einem von einem Heizelement (42) umgebenden Bimetall (40) elektrisch in Reihe geschaltet ist.
EP19920420161 1991-05-21 1992-05-15 Elektromagnetischer Auslöser für einen Schwachstromschalter Expired - Lifetime EP0515292B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9106309A FR2676860B1 (fr) 1991-05-21 1991-05-21 Declencheur electromagnetique pour un disjoncteur electrique a bas calibres.
FR9106309 1991-05-21

Publications (2)

Publication Number Publication Date
EP0515292A1 EP0515292A1 (de) 1992-11-25
EP0515292B1 true EP0515292B1 (de) 1995-04-12

Family

ID=9413122

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920420161 Expired - Lifetime EP0515292B1 (de) 1991-05-21 1992-05-15 Elektromagnetischer Auslöser für einen Schwachstromschalter

Country Status (4)

Country Link
EP (1) EP0515292B1 (de)
DE (1) DE69201999T2 (de)
ES (1) ES2073896T3 (de)
FR (1) FR2676860B1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753836B1 (fr) * 1996-09-23 1998-10-30 Declencheur electromagnetique pour appareil electrique de protection
FR2779567B1 (fr) * 1998-06-03 2000-07-13 Hager Electro Sous-ensemble magnetique optimise
FR2858106B1 (fr) * 2003-07-22 2005-09-23 Hager Electro Sous-ensemble magnetique ameliore et disjoncteur comportant un tel sous-ensemble magnetique
FR2868596B1 (fr) * 2004-04-01 2006-05-26 Schneider Electric Ind Sas Sous-ensemble magnetique d'un appareil electrique interrupteur
EP1906427A1 (de) * 2006-09-29 2008-04-02 Siemens Aktiengesellschaft Elektromagnetische Antriebseinheit und elektromagnetische Schaltvorrichtung
CN103337422B (zh) * 2013-06-21 2015-04-22 浙江电器开关有限公司 塑壳式断路器脱扣器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2138381C3 (de) * 1971-07-31 1975-05-15 Siemens Ag, 1000 Berlin Und 8000 Muenchen Schutzschalter, insbesondere Leitungsschutzschalter
FR2434473A1 (fr) * 1978-08-25 1980-03-21 Legrand Sa Disjoncteur a contact mobile articule par pivot a un organe d'accrochage lui-meme mobile
FR2592738B1 (fr) * 1986-01-03 1990-05-11 Merlin Gerin Disjoncteur electrique miniature a contact mobile multiple
DE3680902D1 (de) * 1986-01-10 1991-09-19 Matsushita Electric Works Ltd Ausschalter.
EP0410257A1 (de) * 1989-07-26 1991-01-30 Siemens Aktiengesellschaft Elektromechanischer Schnellschalter

Also Published As

Publication number Publication date
EP0515292A1 (de) 1992-11-25
DE69201999T2 (de) 1995-11-23
FR2676860A1 (fr) 1992-11-27
ES2073896T3 (es) 1995-08-16
DE69201999D1 (de) 1995-05-18
FR2676860B1 (fr) 1994-06-17

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