EP0926694A1 - Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter - Google Patents

Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter Download PDF

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Publication number
EP0926694A1
EP0926694A1 EP98410146A EP98410146A EP0926694A1 EP 0926694 A1 EP0926694 A1 EP 0926694A1 EP 98410146 A EP98410146 A EP 98410146A EP 98410146 A EP98410146 A EP 98410146A EP 0926694 A1 EP0926694 A1 EP 0926694A1
Authority
EP
European Patent Office
Prior art keywords
heating means
bimetallic strip
striker
circuit breaker
current
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
EP98410146A
Other languages
English (en)
French (fr)
Other versions
EP0926694B1 (de
Inventor
Jean-Louis Jacquet
Jean-Yves Amblard
Philippe Schuster
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 Industries SAS
Original Assignee
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0926694A1 publication Critical patent/EP0926694A1/de
Application granted granted Critical
Publication of EP0926694B1 publication Critical patent/EP0926694B1/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
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/164—Heating 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
    • 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
    • H01H71/7409—Interchangeable elements

Definitions

  • the present invention relates to a magneto-thermal tripping device in particular for circuit breaker, comprising a magnetic trip device capable of driving a tripping of the circuit breaker mechanism during a sudden rise in current following a short circuit, and a thermal trip device comprising a bimetallic strip capable of cause tripping of the circuit breaker mechanism in the event of an overload of current causing a slow rise in current.
  • This document describes a trip device comprising magnetic trip means and thermal trip means.
  • the first include a coil supported by a good heat conducting sheath closed at one of its ends, and inside which are mounted on the one hand, a so-called fixed core, fixed inside the sheath, and a said mobile core, mounted sliding inside the sheath with interposition between the two cores, of a spring.
  • a striker is slidably mounted inside the fixed core and has one end in abutment on the movable core, and another end capable of cooperating with the tripping mechanism of the circuit breaker.
  • the thermal trip means comprise a bimetallic strip supported between one of the enlarged ends of the aforementioned sheath and a capsule, said bimetallic strip being traversed by the aforementioned striker and cooperating with a ring belonging to the striker so as to drive said striker during an overload current.
  • the temperature rise of the blistering bimetallic strip is done by the coil which must first heat the aluminum sheath and the fixed steel core, which in turn will transmit their heat to the blistering bimetallic strip, from which a long bimetal reaction time.
  • the two electromagnetic and thermal devices being dependent, they can hardly to be separated.
  • the present invention solves these problems and proposes a triggering device.
  • magneto-thermal of simple design presenting a short reaction time, including caliber can be easily adapted and which allows a dissociation of the two parts.
  • the subject of the present invention is a device of the aforementioned type, this device being characterized in that the thermal trip device comprises a means of heating the bimetallic strip traversed by the current to be monitored and capable of transmitting any rise in temperature to the bimetallic strip corresponding to an increase in current through the heating means, said heating means being independent of the magnetic trip device so as to be able to be adapted to the rating and / or standard of the apparatus.
  • the bimetallic strip is directly in contact with the heating means.
  • the shape of the heating means is adapted to that of the bimetallic strip.
  • the bimetallic strip being in the form of a concave disc
  • the aforementioned heating means is also in the form of a concave disc.
  • this heating means is made of an electrically conductive material with high electrical resistivity.
  • the shape of the heating means and its thickness are adapted, depending on the size and / or standard of the device.
  • the aforementioned heating means comprises a cutout and the shape of this cutout and / or the thickness of the heating means are determined so as to confer on said driver an impedance adapted to the different sizes and standards.
  • the material in which the driver will be made as well as its formatting can be determined so as to give the heating means an impedance adapted to the different calibers and standards of the device.
  • the driver being independent, the two triggers namely magnetic and thermal can be placed so as to be distant from each other.
  • the present invention also relates to a device comprising the aforementioned characteristics taken alone or in combination.
  • FIGS 1 to 7 show a magneto-thermal trip device D intended to be used in a low voltage electric circuit breaker (not shown) to protect a circuit electric against overloads or short circuits.
  • This circuit breaker includes mainly, in a manner known per se, a pair of separable contacts fixed and mobile respectively, an opening and closing control mechanism of the circuit breaker actuated by a handle, an electromagnetic trip device E intended for trip the circuit breaker mechanism and thus cause the contacts to open when the appearance of a short-circuit current and a thermal trip device T capable of trigger the mechanism when a current overload occurs.
  • the trigger electromagnetic E comprises a flange 1 on which is fixed a fixed core 2, a plastic sheath 3 force-fitted around the fixed core 2, a coil 4 mounted around the sheath 3 and having one end 4a welded to the flange 1, a carcass 5 U-shaped covering the coil 4, said carcass 5 having in its base an orifice 6 intended to allow the introduction and sliding of a movable core 7, said carcass 5 also comprising around this orifice 6 an annular recess 8 intended to receive one 3b of the ends of the aforementioned sheath 3, and being welded to the flange 1 by the free end 5a of one of its two wings.
  • This movable core 7 is secured by its end 7a located inside the sheath 3, at one of the ends 9a of a striker 9 mounted sliding inside the fixed core 2, and the end of which opposite 9b is intended to cooperate with a percussion lever 10 (fig. 1 and 2) capable of trigger the mechanics and strike the moving contact.
  • the fixed core 2 has a recess 13 (fig. 1) adapted to receive, by one 12b of these ends, a spring 12 mounted around the striker 9 and the other end 12a of which rests on the core mobile 7. It will be noted that this striker 9 is crimped in an orifice 7b of the mobile core 7 in order to avoid parasitic games This spring 12 is intended to recall the movable core 7 in rest position as illustrated in fig. 1 and 2.
  • the set including the sheath 3, the coil 4 and the two cores 2 and 7 is mounted inside a carcass 5 comprising at one of these ends an orifice 6 for passage of the movable core 7 and closed at its opposite end by a flange 1, said flange 1 being connected electrically on the one hand to the coil 4 and on the other hand by means of heating 16 of the coil.
  • the thermal part T of the magneto-thermal trip device comprises a so-called capsule upper 14 having a recess 14a adapted to receive a bimetallic strip 15 said blistering consisting of a disc curved towards the side opposite the capsule in the rest position, a so-called heater element 16 comprising a disc, one of the faces 16a (fig.3) of which a curved shape corresponding to the curved shape of the bimetallic strip 15, said driver 16 also comprising a radial slot 17 whose function will be explained later as well as two legs 18,19 extending substantially perpendicularly in the plane of the aforementioned disc in two opposite directions.
  • the thermal release further comprises a so-called lower capsule 20 in the form of a plate, said capsule being intended to be fixed to the heating element 16 by one of these faces and comprising a central orifice 20a in which the stud 2a associated with the fixed core 2 is force-fitted to secure the thermal part to the magnetic part.
  • a so-called lower capsule 20 in the form of a plate, said capsule being intended to be fixed to the heating element 16 by one of these faces and comprising a central orifice 20a in which the stud 2a associated with the fixed core 2 is force-fitted to secure the thermal part to the magnetic part.
  • the bimetallic strip and the means of heating are trapped between the lower capsule 20 supporting the means of heater 16 and the upper capsule 14 comprising the recess 14a, said recess 14a comprising a circumferential rim 14b, said bimetallic strip 15 being immobilized between this rim 14b and the circumferential edge 16b of the heating means 16.
  • the face 16a of the heating element 16, which is intended to be in contact with the bimetallic strip 15 is adapted to that of the bimetallic strip 15 so that the total surface of the bimetallic strip is in contact with the heating element in the rest position of the trigger.
  • the disc constituting the bimetallic strip 15 is made of a material sensitive to temperature in such a way that the shape of the bimetallic strip changes under the effect of a change in temperature.
  • trigger temperature when the temperature reaches a so-called trigger temperature, the curvature of the disc is reversed.
  • orifices 17, 15a are provided respectively in the heating element 16, the bimetallic strip 15 and the upper capsule 14 and are intended to allow the passage of the striker 9 and allow it to slide through these elements.
  • the driver 16 may include a cutout 17 (opening) whose size is determined according to the size of the circuit breaker. Indeed, the shape of the driver 16, its dimensions as well as the material in which it is made, can be determined so as to give it an impedance adapted to the different sizes and standards of the devices.
  • the driver 16 has an elongated opening 17 extending substantially from the center to the outside diameter of the disc and having a width corresponding substantially to the spacing of two legs 18,19.
  • the resistance of the driver 16 is proportional to the length of the current path between the two ranges 18,19 and to the resistance of the material, but is inversely proportional to the width l of the track. In fig.
  • the disc has an opening 17 extending radially from the outer edge of the disc over half of its radius, and this over a circumferential length corresponding substantially to half of the previous one.
  • no opening is provided except that intended for the passage of the striker.
  • the value of the resistance of the first driver represented in FIG. 8 is lower than that of the second driver represented in FIG. 9, which is lower than that of the driver illustrated in FIG. 10.
  • the bimetallic strip 15 and the striker 9 respectively cooperate with two perpendicular arms 10b, 10a belonging to a return lever 10 controlling the tripping bar of the circuit breaker, the arm 10b cooperating with the bimetallic strip 15 passing through the upper capsule 14.
  • the device of the invention is in the corresponding rest position to normal operation of the device during which the current (I in fig. 3) flows through the coil 4, then through the flange 1, then reaches the driver 16 by one 18 of its tracks 18,19, and joins the other 19 of the driver's tracks while driving around the cutout 17, after which the current reaches the movable contact, in contact electric with fixed contact (not shown).
  • a field magnetic is generated by the coil 4.
  • a magnetic threshold is reached, which causes the displacement of the nucleus movable 7 towards the fixed core 2 as illustrated in FIGS. 4 and 5.
  • the assembly the striker core then strikes the return lever 10, which initially goes, after a certain movement of movement of the lever act on the trigger bar to control the triggering of the mechanism and then, after a stroke of additional movement of the lever, act on the movable contact to cause the abrupt opening of the contacts.
  • the striker fills two functions, because on the one hand it acts on the triggering mechanism and on the other hand, it exerts a percussion on the movable contact, to give it an opening force important on short circuit.
  • the driver 16 will be made of a special electrically alloy conductor with high resistivity such as stainless steel, while the capsules lower and upper will advantageously be made of plastic.
  • the scabbard insulation can be made of plastic.
  • heating means will not necessarily be in contact direct with the bimetallic strip, but that an air film or other may be interposed between the bimetallic strip and the heating means.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
EP98410146A 1997-12-19 1998-12-14 Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter Expired - Lifetime EP0926694B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9716543A FR2772980B1 (fr) 1997-12-19 1997-12-19 Dispositif de declenchement magneto-thermique et disjoncteur equipe de ce dispositif
FR9716543 1997-12-19

Publications (2)

Publication Number Publication Date
EP0926694A1 true EP0926694A1 (de) 1999-06-30
EP0926694B1 EP0926694B1 (de) 2007-02-07

Family

ID=9515164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98410146A Expired - Lifetime EP0926694B1 (de) 1997-12-19 1998-12-14 Magnetothermische Steuervorrichtung und mit einer solchen Vorrichtung ausgerüsteter Schutzschalter

Country Status (4)

Country Link
EP (1) EP0926694B1 (de)
AT (1) ATE353470T1 (de)
DE (1) DE69837032T2 (de)
FR (1) FR2772980B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1041596A2 (de) * 1999-03-30 2000-10-04 Heinrich Kopp Ag Thermische Auslöseeinrichtung für Leitungsschutzschalter
EP2261944A3 (de) * 2009-06-08 2013-10-23 Mitsubishi Electric Corporation Leistungsschalter
CN108550496A (zh) * 2018-07-02 2018-09-18 江苏双汇电力发展股份有限公司 10kV高压电动真空保护开关

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114267568B (zh) * 2022-03-02 2022-05-20 晟望电气有限公司 户外电力保护开关

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259763A (en) * 1962-12-04 1966-07-05 Texas Instruments Inc Thermally responsive control means
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses
EP0603663A1 (de) * 1992-12-16 1994-06-29 ABBPATENT GmbH Thermischer und elektromagnetischer Auslöser
EP0650179A1 (de) * 1993-10-22 1995-04-26 ABBPATENT GmbH Thermischer Überstromauslöser für ein elektrisches Schaltgerät
DE9406806U1 (de) * 1994-04-23 1995-06-01 Thermik Geraetebau Gmbh Bimetallschalter, insbesondere stromabhängiger Schalter
US5499007A (en) * 1993-04-22 1996-03-12 Heinrich Kopp Ag Circuit breaker

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259763A (en) * 1962-12-04 1966-07-05 Texas Instruments Inc Thermally responsive control means
DE3637275C1 (en) * 1986-11-03 1988-05-05 Flohr Peter Overcurrent trip device for protection switching apparatuses
EP0603663A1 (de) * 1992-12-16 1994-06-29 ABBPATENT GmbH Thermischer und elektromagnetischer Auslöser
US5499007A (en) * 1993-04-22 1996-03-12 Heinrich Kopp Ag Circuit breaker
EP0650179A1 (de) * 1993-10-22 1995-04-26 ABBPATENT GmbH Thermischer Überstromauslöser für ein elektrisches Schaltgerät
DE9406806U1 (de) * 1994-04-23 1995-06-01 Thermik Geraetebau Gmbh Bimetallschalter, insbesondere stromabhängiger Schalter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1041596A2 (de) * 1999-03-30 2000-10-04 Heinrich Kopp Ag Thermische Auslöseeinrichtung für Leitungsschutzschalter
EP1041596A3 (de) * 1999-03-30 2002-01-16 Heinrich Kopp Ag Thermische Auslöseeinrichtung für Leitungsschutzschalter
EP2261944A3 (de) * 2009-06-08 2013-10-23 Mitsubishi Electric Corporation Leistungsschalter
CN108550496A (zh) * 2018-07-02 2018-09-18 江苏双汇电力发展股份有限公司 10kV高压电动真空保护开关
CN108550496B (zh) * 2018-07-02 2023-08-01 江苏双汇电力发展股份有限公司 10kV高压电动真空保护开关

Also Published As

Publication number Publication date
DE69837032D1 (de) 2007-03-22
FR2772980B1 (fr) 2000-01-21
DE69837032T2 (de) 2007-07-05
FR2772980A1 (fr) 1999-06-25
ATE353470T1 (de) 2007-02-15
EP0926694B1 (de) 2007-02-07

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