EP0326449A1 - Elektromagnetischer Auslöser mit einstellbarem Ansprechwert - Google Patents

Elektromagnetischer Auslöser mit einstellbarem Ansprechwert Download PDF

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Publication number
EP0326449A1
EP0326449A1 EP89400092A EP89400092A EP0326449A1 EP 0326449 A1 EP0326449 A1 EP 0326449A1 EP 89400092 A EP89400092 A EP 89400092A EP 89400092 A EP89400092 A EP 89400092A EP 0326449 A1 EP0326449 A1 EP 0326449A1
Authority
EP
European Patent Office
Prior art keywords
movable core
core
electromagnetic trip
trip device
force
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.)
Granted
Application number
EP89400092A
Other languages
English (en)
French (fr)
Other versions
EP0326449B1 (de
Inventor
André Raso
Pierre Laffont
Denis Vial
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.)
Merlin Gerin SA
Original Assignee
Merlin Gerin SA
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 filed Critical Merlin Gerin SA
Publication of EP0326449A1 publication Critical patent/EP0326449A1/de
Application granted granted Critical
Publication of EP0326449B1 publication Critical patent/EP0326449B1/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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7463—Adjusting only the electromagnetic 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
    • H01H71/2454—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

  • the invention relates to an electromagnetic trip device for an electrical protection device, with adjustment of the instantaneous trip threshold, comprising a cylinder head having a lower face and an upper face, a plunger core movable axially through an orifice formed in the upper face. , a coil interposed between said faces and arranged around the movable core, a fixed core integral with the underside of the cylinder head, and a return spring urging the movable core in the opposite direction from the fixed core.
  • Such a trigger for example, is used to cause the instantaneous triggering of a device for protection against short-circuit currents, in particular a circuit breaker or contactor, when the current flowing through the coil is sufficiently intense to cause the attraction of the plunger core.
  • the triggering threshold must be perfectly defined and adjustable, and it has already been proposed to modify the initial position of the mobile core, in order to reduce or increase the separation gap of the fixed core or to modify the return force of the core mobile, to set this trigger threshold.
  • the adjustment ranges obtained by these means are limited and there is a need to have additional adjustment means without any noticeable complication of the trigger.
  • the object of the present invention is to enable the production of an electromagnetic trip device with a trigger threshold that can be adjusted with precision and over a wide area.
  • the electromagnetic trip device is characterized by a device for adjusting the initial position of the movable core between a maximum position of separation of the fixed core and a minimum position and by an annular groove formed in said movable core over a slightly axial distance greater than the axial distance between said maximum and minimum positions in the area of said upper face, so that the latter is in the vicinity of one of the edges of the groove in one of said positions and in the contour of the other of the edges of the groove in the other of said positions.
  • the groove formed in the mobile core defines a second air gap in the magnetic circuit excited by the coil and, this second air gap generates a force of attraction of the mobile core which is added to that of the fixed core when the mobile core is in the position. minimum spacing of the fixed core and vice versa, a retaining force of the mobile core which subtracts from the force of attraction of the fixed core when the mobile core is in the maximum position of spacing of the fixed core.
  • the particular shape of the core allows an increase in the adjustment range while maintaining an identical stroke of the movable core, the precision of adjustment of the trigger values being increased.
  • the trigger according to the invention advantageously has a longitudinal axis of symmetry on which the movable core of cylindrical shape is slidably mounted.
  • the groove in the movable core defines a section or a portion of reduced section, which is connected to the two portions which surround it, by inclined edges in the form of truncated cones.
  • the bistable balance of the plunger core essential for obtaining a frank triggering threshold, is improved by the presence of the groove and by the use of a decreasing force return device during the displacement of the movable core towards the fixed core.
  • This decreasing force exerted on the movable core is obtained by a modification of the line of action of the return spring which acts on a pivoting lever with modification of the lever arm.
  • This variation in the restoring force exerted on the movable core as a function of its position also widens the range of adjustment of the trigger thresholds.
  • the coil is offset so as to have, in the minimum adjustment position of the movable core, the gap between the movable core and the fixed core in the center of the coil where the field strength magnetic is maximum. In the maximum position, the movable core is almost outside the coil in a reduced field area which results in a higher trigger threshold.
  • a U-shaped cylinder head 10 which can also be a partially or entirely closed housing, has an upper face 12 and a lower face 14, surrounding a coil 16 connected to an electrical circuit not shown.
  • the lower face 14 carries a fixed core 18 penetrating axially inside the coil 16 and cooperating with a movable core 20 mounted to slide along an axis XX of symmetry of the trigger.
  • the yoke 10, the fixed core 18 and the movable core 20 are made of a suitable magnetizable material well known to specialists.
  • the upper face 12 has an orifice 22 for passage of the movable core 20 with the interposition of a cylindrical sheath 24 of non-magnetic insulating material which sheaths the fixed core 18 and mobile core 20 assembly.
  • the coil 16 is offset axially in the direction of the lower face 14 while being held mechanically by a spacer 26 interposed between the upper face 12 of the cylinder head 10 and the top of the coil 16. Any other means of fixing the coil is of course usable.
  • a pivoting lever 28 is mounted on a fixed pivot axis 30, for example carried by the cylinder head 10 and is mechanically connected to the movable core 20 by a light 32, in which is engaged a lug 34 carried by the movable core 20.
  • a spring return 36 is anchored on the one hand to a point 38 of the pivoting lever 28, and on the other to a point 40.
  • the anchoring points 38.40 are arranged relative to the pivot axis 30 of the pivoting lever 28, so as to exert on the latter a moment urging the pivoting lever clockwise, corresponding to an upward movement of the movable core 20 in FIG. 1.
  • the connection to light 32 and lug 34 transforms the pivoting movement of the pivoting lever 28 in a sliding movement of the movable core 20.
  • the pivoting lever 28 carries a tongue 44 for actuating a trip bar 46, for example of an electrical protection circuit breaker.
  • the pivoting lever 28 cooperates with a stop 48 formed on one of the arms of a rocker 50, the other arm of which cooperates with an adjustment wedge 52, controlled to slide by any suitable means, in particular by adjustment screw not shown .
  • the return spring 36 biases the pivoting lever 28 in abutment of the stop 48, the position of which defines the initial position of the plunger core 20. It is easy to see that a depression of the adjustment wedge 52 generates a downward movement in direction of the fixed core 18, of the movable core 20 and conversely that a withdrawal of the corner 52 authorizes a separation of the movable core 20 from the fixed core 18, the two extreme adjustment positions, in this case the minimum position and the maximum position being shown in Figures 1 and 2.
  • the coil 16 is not energized, the movable core 20 is held in the position away from the fixed core 18, this initial position being a function of the position of the adjustment wedge 52, that is to say the position of minimum adjustment shown in FIG. 1, ie the maximum adjustment position shown in FIG.
  • FIG. 3 illustrates the attracted position of the movable core 20 which causes actuation of the trigger bar 46 by the tongue 44 of the pivoting lever 28.
  • the return spring 36 returns the assembly to the position initial ready for new operation.
  • the anchor point 40 of the spring 36 can be moved by an adjustment screw 54 to adjust the line of action of the return spring 36, and thus modify the return force exerted on the movable core 20.
  • the movable core 20 has according to the invention, a groove 56 with a bottom 58 of cylindrical shape and with lower edges 60 and upper 62 inclined.
  • the edges 60, 62 in the shape of a truncated cone ensure the connection of the groove 56 to the lower 64 and upper 66 portions of the movable core 20 of enlarged section.
  • the magnetic flux travels through a first air gap E1 between the movable core 20 and the fixed core 18, then the lower face 14, the yoke 10, the upper face 12 and a second air gap E2 between the edge of the orifice 22 and the edge 62 of the groove 56.
  • An attractive force F1 tends to attract the mobile core 20 towards the fixed core 18 to reduce the first air gap E1 and to this force F1 , a second force F2 is added at the air gap E2.
  • the groove 56 is arranged so that in the minimum adjustment position, the edge 62 is slightly above the orifice 22 to generate a force having a component F2 oriented in the direction of the fixed core 18.
  • the air gap E1 is notably increased and the edge 60 comes opposite the orifice 22 while nevertheless remaining below the upper face 12.
  • the pole surfaces of the air gap E1 are conical but they can of course be flat and the height of the fixed core 18 can be reduced.
  • the return device can be arranged differently and the guide sleeve 24 can be replaced by any other means, in particular by a guide rod passing through the movable plunger core 20.
  • the pole surface of the yoke 10 defining the air gap E2 and E3 can be shaped differently, in particular be enlarged to modify the distribution of field lines, without departing from the scope of the present invention.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
EP89400092A 1988-01-28 1989-01-12 Elektromagnetischer Auslöser mit einstellbarem Ansprechwert Expired - Lifetime EP0326449B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8801100 1988-01-28
FR8801100A FR2626713B1 (fr) 1988-01-28 1988-01-28 Declencheur electromagnetique a reglage du seuil de declenchement

Publications (2)

Publication Number Publication Date
EP0326449A1 true EP0326449A1 (de) 1989-08-02
EP0326449B1 EP0326449B1 (de) 1993-09-29

Family

ID=9362795

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400092A Expired - Lifetime EP0326449B1 (de) 1988-01-28 1989-01-12 Elektromagnetischer Auslöser mit einstellbarem Ansprechwert

Country Status (6)

Country Link
US (1) US4939492A (de)
EP (1) EP0326449B1 (de)
JP (1) JP2845917B2 (de)
DE (1) DE68909431T2 (de)
ES (1) ES2046495T3 (de)
FR (1) FR2626713B1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000010187A1 (de) * 1998-08-14 2000-02-24 Siemens Aktiengesellschaft Einrichtung mit axial positionierbarer spulenwicklung
EP1258897A1 (de) * 2001-05-17 2002-11-20 Siemens Energy & Automation, Inc. Elektromagneteinheit mit Klappanker
WO2003054898A1 (en) * 2001-12-20 2003-07-03 Abb Service S.R.L. Electromagnetic relay for low-voltage circuit breaker
FR2958447A1 (fr) * 2010-04-02 2011-10-07 Schneider Electric Ind Sas Declencheur electromagnetique pour appareil electrique interrupteur, appareil electrique interrupteur comportant un tel declencheur
CN103617929A (zh) * 2013-10-21 2014-03-05 浙江共同电子科技有限公司 一种双电磁铁结构的智能断路器
CN110739191A (zh) * 2018-07-20 2020-01-31 施耐德电器工业公司 电磁脱扣器

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IT1292453B1 (it) 1997-07-02 1999-02-08 Aeg Niederspannungstech Gmbh Gruppo rotante di contatti per interrutttori di alta portata
DE19819242B4 (de) 1998-04-29 2005-11-10 Ge Power Controls Polska Sp.Z.O.O. Thermomagnetischer Leistungsschalter
US6114641A (en) 1998-05-29 2000-09-05 General Electric Company Rotary contact assembly for high ampere-rated circuit breakers
US6087913A (en) * 1998-11-20 2000-07-11 General Electric Company Circuit breaker mechanism for a rotary contact system
US6037555A (en) * 1999-01-05 2000-03-14 General Electric Company Rotary contact circuit breaker venting arrangement including current transformer
US6166344A (en) * 1999-03-23 2000-12-26 General Electric Company Circuit breaker handle block
US6262872B1 (en) 1999-06-03 2001-07-17 General Electric Company Electronic trip unit with user-adjustable sensitivity to current spikes
US6268991B1 (en) 1999-06-25 2001-07-31 General Electric Company Method and arrangement for customizing electronic circuit interrupters
US6218917B1 (en) 1999-07-02 2001-04-17 General Electric Company Method and arrangement for calibration of circuit breaker thermal trip unit
US6188036B1 (en) 1999-08-03 2001-02-13 General Electric Company Bottom vented circuit breaker capable of top down assembly onto equipment
US6252365B1 (en) 1999-08-17 2001-06-26 General Electric Company Breaker/starter with auto-configurable trip unit
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US6396369B1 (en) 1999-08-27 2002-05-28 General Electric Company Rotary contact assembly for high ampere-rated circuit breakers
US6175288B1 (en) 1999-08-27 2001-01-16 General Electric Company Supplemental trip unit for rotary circuit interrupters
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US6326869B1 (en) 1999-09-23 2001-12-04 General Electric Company Clapper armature system for a circuit breaker
US6239395B1 (en) 1999-10-14 2001-05-29 General Electric Company Auxiliary position switch assembly for a circuit breaker
US6229413B1 (en) 1999-10-19 2001-05-08 General Electric Company Support of stationary conductors for a circuit breaker
US6317018B1 (en) 1999-10-26 2001-11-13 General Electric Company Circuit breaker mechanism
US6232856B1 (en) 1999-11-02 2001-05-15 General Electric Company Magnetic shunt assembly
ES2249875T3 (es) 1999-11-03 2006-04-01 AEG NIEDERSPANNUNGSTECHNIK GMBH & CO. KG Disposicion de brazo de contacto rotatorio para disyuntor.
US6377144B1 (en) 1999-11-03 2002-04-23 General Electric Company Molded case circuit breaker base and mid-cover assembly
US6300586B1 (en) 1999-12-09 2001-10-09 General Electric Company Arc runner retaining feature
US6310307B1 (en) 1999-12-17 2001-10-30 General Electric Company Circuit breaker rotary contact arm arrangement
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US6281461B1 (en) 1999-12-27 2001-08-28 General Electric Company Circuit breaker rotor assembly having arc prevention structure
US6346869B1 (en) 1999-12-28 2002-02-12 General Electric Company Rating plug for circuit breakers
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US4603312A (en) * 1985-03-21 1986-07-29 Westinghouse Electric Corp. Circuit breaker with adjustable trip unit

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000010187A1 (de) * 1998-08-14 2000-02-24 Siemens Aktiengesellschaft Einrichtung mit axial positionierbarer spulenwicklung
US6300853B1 (en) 1998-08-14 2001-10-09 Siemens Aktiengesellschaft Device with axially positionable coil winding
EP1258897A1 (de) * 2001-05-17 2002-11-20 Siemens Energy & Automation, Inc. Elektromagneteinheit mit Klappanker
WO2003054898A1 (en) * 2001-12-20 2003-07-03 Abb Service S.R.L. Electromagnetic relay for low-voltage circuit breaker
US6930575B2 (en) 2001-12-20 2005-08-16 Abb Service S.R.L. Electromagnetic relay for low-voltage circuit breaker
FR2958447A1 (fr) * 2010-04-02 2011-10-07 Schneider Electric Ind Sas Declencheur electromagnetique pour appareil electrique interrupteur, appareil electrique interrupteur comportant un tel declencheur
CN103617929A (zh) * 2013-10-21 2014-03-05 浙江共同电子科技有限公司 一种双电磁铁结构的智能断路器
CN103617929B (zh) * 2013-10-21 2016-03-30 浙江共同电子科技有限公司 一种双电磁铁结构的智能断路器
CN110739191A (zh) * 2018-07-20 2020-01-31 施耐德电器工业公司 电磁脱扣器

Also Published As

Publication number Publication date
JPH01225025A (ja) 1989-09-07
DE68909431D1 (de) 1993-11-04
FR2626713A1 (fr) 1989-08-04
EP0326449B1 (de) 1993-09-29
ES2046495T3 (es) 1994-02-01
JP2845917B2 (ja) 1999-01-13
US4939492A (en) 1990-07-03
FR2626713B1 (fr) 1990-06-01
DE68909431T2 (de) 1994-05-05

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