EP2926357A1 - Dispositif déclencheur pour disjoncteur - Google Patents

Dispositif déclencheur pour disjoncteur

Info

Publication number
EP2926357A1
EP2926357A1 EP13799284.8A EP13799284A EP2926357A1 EP 2926357 A1 EP2926357 A1 EP 2926357A1 EP 13799284 A EP13799284 A EP 13799284A EP 2926357 A1 EP2926357 A1 EP 2926357A1
Authority
EP
European Patent Office
Prior art keywords
bimetal
current path
tripping device
tripping
circuit breaker
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
EP13799284.8A
Other languages
German (de)
English (en)
Other versions
EP2926357B1 (fr
EP2926357B8 (fr
Inventor
Sander SCHMITZ
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.)
Eaton Intelligent Power Ltd
Original Assignee
Eaton Electrical IP GmbH and Co KG
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 Eaton Electrical IP GmbH and Co KG filed Critical Eaton Electrical IP GmbH and Co KG
Publication of EP2926357A1 publication Critical patent/EP2926357A1/fr
Publication of EP2926357B1 publication Critical patent/EP2926357B1/fr
Application granted granted Critical
Publication of EP2926357B8 publication Critical patent/EP2926357B8/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • 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
    • 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
    • H01H2071/165—Heating elements the bimetal being inductively heated, e.g. load current does not pass through bimetal

Definitions

  • the invention relates to a tripping device for circuit breakers.
  • circuit breakers use electronic overload tripping devices or triggers.
  • Thermal or thermomagnetic actuators which use a bimetallic strip or a bimetallic strip, have hitherto not been suitable for use at such high rated currents for various reasons.
  • the tripping time for thermal triggers is determined by the temperature at the bimetal and the temperature-dependent deflection of the bimetal.
  • the bimetal is thereby connected to the conductor at one or more points.
  • the heating of the bimetal therefore occurs mainly at this connection point (s).
  • the bimetal takes a relatively long period of time to reach the deflection required to initiate the process.
  • the usually required tripping times are therefore not achievable at high currents with bimetal triggers.
  • the self-protection of the circuit breaker is not guaranteed by the too long tripping times, especially at a multiple of the rated current, since too high I 2 t values can occur.
  • Another disadvantage of bimetallic actuators is that the tripping accuracy at high currents can be influenced by external influences such as a draft or the installation position of a circuit breaker, since the bimetal is usually mounted freestanding in circuit breakers. This can cause circuit breakers with bimetallic actuators to trip due to environmental influences at different currents. When measuring the tripping time, in particular at a multiple of the rated current, this is noticeable by different tripping times.
  • Object of the present invention is therefore to propose a tripping device for a circuit breaker, which indeed uses a bimetal, but in which the initially described disadvantage of excessive dependence on environmental or environmental influences is reduced. This object is solved by the subject matters of the independent claims. Further embodiments of the invention are the subject of the dependent claims.
  • An underlying idea of the present invention is to provide a bearing device for the bimetal of a trigger to be arranged approximately parallel to a current path of a circuit breaker, which is designed such that heat radiated from the current path can heat the bimetal almost over its entire length and the bimetal can shield against environmental influences.
  • the deflection of the bimetal is achieved by the radiated heat from the current path and, if appropriate, in addition to the heating of an attachment point of the bimetal on the current path.
  • the bimetal is located mainly within the heat radiation, so that external influences on the heating and deflection of the bimetal are reduced. Above all, the influence of the ambient temperature and the influence of air currents can be reduced by the bearing device.
  • An embodiment of the invention now relates to a tripping device for circuit breakers with a bimetallic device intended to be located near a current path of a circuit breaker for controlling tripping of the circuit breaker and a bimetallic bearing device in which the bimetal is inserted and which is designed to receive the Bit metal in an arrangement approximately parallel to a current path of the circuit breaker so encloses that radiated from the current path heat can heat the bimetal almost over its entire length and the bimetal is shielded from environmental influences.
  • the current path can also be formed by shunts in the sense of the present invention.
  • the bimetallic bearing device may have a bottom on which the bimetal is fixed at a foot point and which is bounded by two side walls which extend approximately parallel to the bimetal and are designed such that the bimetal is protected against environmental influences is shielded.
  • a kind of pocket for the bimetal is formed, in which the radiated heat from the current path is transferred to the bimetal and thus can cause a faster heating of the bimetal, as a result, the tripping of the circuit breaker can be accelerated.
  • the bimetal can be fixed to the ground in such a way that its active side lies opposite the current path. As a result, the heating and thus the deflection of the bimetal can be further accelerated by the radiated heat from the current path and ultimately the triggering.
  • the sidewalls may also be configured to extend at least partially beyond the bimetal.
  • the pocket-like receptacle for the bimetal formed by the bottom and the side walls can more efficiently concentrate the heat radiated from the flow path onto the bimetal, thus ensuring the fastest possible and defined heating of the bimetal and even better shielding from environmental influences.
  • the bimetallic bearing device may be designed to completely enclose the bimetal, in particular it may be formed both as a pocket, sleeve or tube into which the bimetal is inserted. This results in a very constant and rapid heat radiation to the bimetal. Complete enclosing does not mean a hermetic decoupling of the bimetal from the environment. Rather, there are still openings for example, a movable bimetallic pin or pin of the triggering device and for inserting the bimetal in the pocket, sleeve or tube available.
  • the bimetallic bearing device may also be formed by the current path itself.
  • the bimetal is coupled to the current path at least at an attachment point, so that the heat transfer from the current path to the bimetal is particularly efficient.
  • This has the advantage that the bimetal heats up faster and thus the desired deflection earlier, in particular by about 30% earlier than in the comparison described above conventional use of the bimetal without bearing device can be achieved.
  • the bimetallic bearing device may have an L, U, O or circular, spline shape. Such forms may have manufacturing advantages and also favor the concentration of heat around the bimetal.
  • a further embodiment relates to a circuit breaker, in particular for high rated currents, with at least one current path and a tripping device according to the invention and as described herein per current path, wherein the tripping device associated with a current path is arranged with respect to the current path, that the bimetal of the tripping device in a predetermined distance is approximately parallel to the current path and can be heated by the heat radiated from the current path.
  • FIG. 1 shows a sketch with a perspective view of a first embodiment of a bimetal tripping device according to the invention
  • FIG. 2 shows the bimetal tripping device shown in FIG. 1 in a sectional view
  • Fig. 2 is a perspective view of a second embodiment of a bimetal tripping device according to the invention.
  • the bimetallic bearing device is formed as a separate element to which the bimetal is fixed and which is mounted over the current path.
  • the bimetal is effectively shielded from environmental influences such as air currents, so that the heat given off by the current path can act almost unhindered on the bimetal.
  • the required tripping time of the circuit breaker tripping device can be better maintained because environmental or environmental influences through the shield of the bimetal have less influence on the heating of the bimetal and thus the triggering.
  • the circuit breaker tripping device 10 shown in FIG. 1 comprises a bimetal 14 in the form of a strip which is disposed approximately parallel to a current path 12 of the circuit breaker.
  • the distance between the current path 12 and the bimetal 14 is in this case dimensioned such that the heat developed when the rated current of the current path 12 is exceeded and radiated from the current path 12 produces a deflection of the bimetal within a predetermined period of time, so that tripping in the circuit breaker within a defined period of time can be done.
  • the bimetal 14 is fixed at a base 20 to a bottom 18 of a bearing device 16 for the bimetal 14.
  • the bearing means 16 is formed as a separate component. However, it can also be formed by the current path itself as in the embodiment shown in FIG.
  • the bearing device 16 also has two side walls 22, which together with the bottom 18 form a kind of pocket for the bimetal 14.
  • the side walls 22 extend over the bimetal 14, as can be seen in Fig. 2. They can also extend at least partially over the current path 12 (dashed extensions of the side walls 22 in FIG. 2), so that the current path 12 and the bimetal 14 can be almost completely covered by the bearing device.
  • the side walls 22 may extend the length of the bent bimetal 14. It is also conceivable, the storage facility completely, ie to make closed from all sides, so that the current path 12 and the bimetal 14 are housed in a common housing.
  • the bearing means 16 comprise a pocket, a tube or a sleeve, which enclose the flow path 12 and the bimetal 14.
  • the storage device 16 fulfills two tasks: on the one hand, it effects a distribution of the heat radiated from the current path 12 over almost the entire length of the bimetal 14, since the radiated heat develops within the created by the bottom 18 and the side walls 22 of the storage device 16 space and so relatively evenly heat the bimetal 14 located in the room.
  • the bearing device 16 forms a kind of shielding of the bimetal 14 from environmental influences such as air currents or the ambient temperature.
  • the bimetallic bearing means 16 has a U-shaped cross section. However, it may also have other cross-sectional shapes, such as an L, O or circular, spline shape.
  • the shape of the bearing device can be chosen depending on the application and adapted to the conditions of use.
  • a further modification of the embodiment shown in FIGS. 1 and 2 may be to use the bearing device 16 itself as a current path.
  • the flow path 12 in this case may be a shunt which may serve to reduce mass at the bearing means.
  • the bimetallic bearing device is formed by the current path itself, i. not formed as a separate element.
  • the bimetal is in this case fixed directly to at least one point on the current path, whereby a relatively rapid heating of the bimetal and thus short tripping time of the triggering device can be achieved.
  • Fig. 3 shows a further embodiment of the tripping device 11 according to the invention, in which the bimetallic bearing device 17 is formed by the current path 13 of a circuit breaker and therefore the current path 13 forms part of the tripping device.
  • the bimetallic bearing device 17 is an integral part of the current path 13.
  • the current path 13 is for this purpose formed such that it forms a kind of pocket for the bimetal 15, which is fixed directly via a foot 21 to the current path 13 at a bottom 19 of the bearing device 17, which is formed by a specially trained portion of the current path 13 ,
  • the bimetal 15 is arranged approximately parallel to the flow path 13 suspended above this. It is heated on the one hand on the foot 21, and on the other hand almost over its entire length by the radiated from the current path 13 heat.
  • the tripping device 11 shown with the current path 13 may be formed for example as part of a current path of a circuit breaker, whereby it can be installed with relatively little installation effort in the circuit breaker.
  • the tripping device 11 shown may already be preassembled, whereby it only has to be installed in the circuit breaker for mounting.
  • a tripping device 11 is less suitable for retrofitting, since it requires at least a partial replacement of an existing current path, while the tripping device shown in Fig. 1 and 2 can be retrofitted in an existing circuit breaker usually without modification of the current path.
  • the present invention is particularly suitable for use in circuit breakers with thermal triggers and can cause a reduction in the tripping times and the environmental or environmental influences, especially in thermomagnetic circuit breakers for rated currents of 250 amps or greater. Furthermore, the invention provides a cost-effective alternative to the standard electronic overload releases for circuit breakers for nominal currents of 630 amps or greater.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

L'invention concerne un dispositif déclencheur (10) pour un disjoncteur, comprenant un bilame (14), destiné à être disposé au voisinage d'un trajet de courant (12) du disjoncteur afin de commander un déclenchement, et un système support de bilame (16) dans lequel le bilame est installé et qui est conformé de manière à entourer le bilame, selon une disposition sensiblement parallèle à un trajet de courant du disjoncteur, de façon que la chaleur rayonnée par le trajet de courant chauffe le bilame pratiquement sur toute sa longueur.
EP13799284.8A 2012-11-29 2013-11-29 Dispositif de declenchement pour disjoncteur Active EP2926357B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012111566.4A DE102012111566A1 (de) 2012-11-29 2012-11-29 Auslösevorrichtung für Leistungsschalter
PCT/EP2013/075176 WO2014083189A1 (fr) 2012-11-29 2013-11-29 Dispositif déclencheur pour disjoncteur

Publications (3)

Publication Number Publication Date
EP2926357A1 true EP2926357A1 (fr) 2015-10-07
EP2926357B1 EP2926357B1 (fr) 2018-05-02
EP2926357B8 EP2926357B8 (fr) 2018-06-06

Family

ID=49709664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13799284.8A Active EP2926357B8 (fr) 2012-11-29 2013-11-29 Dispositif de declenchement pour disjoncteur

Country Status (5)

Country Link
US (1) US9558902B2 (fr)
EP (1) EP2926357B8 (fr)
CN (1) CN104838465B (fr)
DE (1) DE102012111566A1 (fr)
WO (1) WO2014083189A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN205657029U (zh) * 2016-04-05 2016-10-19 浙江正泰电器股份有限公司 塑壳断路器的热脱扣装置

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296398A (en) * 1963-08-12 1967-01-03 Gen Electric Thermal overload assembly for circuit breaker
US3243554A (en) * 1964-01-23 1966-03-29 Mechanical Products Inc Combination motor protector and start relay
US3288964A (en) * 1965-06-01 1966-11-29 Ite Circuit Breaker Ltd Spring trip multi-phase overload relay having a u-shaped bimetal with a pivot pin at its web portion
GB1097708A (en) * 1965-10-13 1968-01-03 Crabtree & Co Ltd J A Improvements in thermal overioad devices for the protection of electric motors
US3422317A (en) * 1966-10-18 1969-01-14 Harold E Whiting Three-phase bimetal overload relay
US3715699A (en) * 1971-07-15 1973-02-06 Fasco Industries Thermostat with reset pin
US4101861A (en) * 1976-03-15 1978-07-18 Texas Instruments Incorporated Thermostatic switch and method of assembly
GB2077510A (en) * 1980-06-06 1981-12-16 Gen Electric Co Ltd Thermally responsive switches
JPS5798930A (en) * 1980-12-10 1982-06-19 Matsushita Electric Works Ltd Temperature switch
US4363016A (en) * 1981-06-03 1982-12-07 Amf Incorporated Circuit breaker
US4459572A (en) * 1982-09-10 1984-07-10 Eaton Corporation Circuit breaker with improved latch trip mechanism
US4486733A (en) * 1982-09-29 1984-12-04 Eaton Corporation Thermal mechanism with ambient compensating bimetal providing trip force
US4546336A (en) * 1983-09-02 1985-10-08 Eaton Corporation Residential circuit breaker with combination slot motor and arc chute
US4620175A (en) * 1985-10-11 1986-10-28 North American Philips Corporation Simple thermostat for dip mounting
US4795997A (en) * 1987-11-02 1989-01-03 North American Philips Corporation Thermostat for board mounting
US5191310A (en) * 1992-07-09 1993-03-02 Eaton Corporation Adjustable cycling switch for electric range
DE19653295A1 (de) * 1996-12-20 1998-06-25 Abb Patent Gmbh Überstrom- und Kurzschlußauslöser für einen elektrischen Installationsschalter
US5793026A (en) * 1997-04-14 1998-08-11 Eaton Corporation Magnetic trip assembly and circuit breaker incorporating same
US6559752B1 (en) * 1999-05-24 2003-05-06 Frank J. Sienkiewicz Creepless snap acting bimetallic switch having flexible contact members
US6469610B1 (en) * 2000-07-28 2002-10-22 Tsung-Mou Yu Switch assembly
US6633222B2 (en) * 2000-08-08 2003-10-14 Furukawa Precision Engineering Co., Ltd. Battery breaker
US7209337B2 (en) * 2005-04-19 2007-04-24 Remy International, Inc. Electrical thermal overstress protection device
CN200956355Y (zh) * 2006-06-14 2007-10-03 王卫东 塑壳式剩余电流保护器和断路器
DE102008048554B3 (de) * 2008-09-16 2010-02-04 Hofsaess, Marcel P. Temperaturabhängiger Schalter
DE102012202153B4 (de) * 2012-02-14 2021-09-16 Siemens Aktiengesellschaft Thermomagnetischer Auslöser für kleine Strombereiche sowie elektrisches Schaltgerät damit
US9601296B2 (en) * 2012-04-13 2017-03-21 Siemens Industry, Inc. Low tripping level circuit breakers, tripping units, and methods

Also Published As

Publication number Publication date
DE102012111566A1 (de) 2014-06-05
CN104838465B (zh) 2018-02-06
WO2014083189A1 (fr) 2014-06-05
EP2926357B1 (fr) 2018-05-02
CN104838465A (zh) 2015-08-12
US9558902B2 (en) 2017-01-31
US20150318130A1 (en) 2015-11-05
EP2926357B8 (fr) 2018-06-06

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