EP1209711A1 - Hilfseinrichtung - Google Patents

Hilfseinrichtung Download PDF

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Publication number
EP1209711A1
EP1209711A1 EP00204095A EP00204095A EP1209711A1 EP 1209711 A1 EP1209711 A1 EP 1209711A1 EP 00204095 A EP00204095 A EP 00204095A EP 00204095 A EP00204095 A EP 00204095A EP 1209711 A1 EP1209711 A1 EP 1209711A1
Authority
EP
European Patent Office
Prior art keywords
auxiliary device
lever
circuit breaker
coupling
piezoelectric material
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
EP00204095A
Other languages
English (en)
French (fr)
Other versions
EP1209711B1 (de
Inventor
Pietro Mandurino
Davide Malacalza
Bianc Giuseppe Bertolotto
Claudio Redaelli
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.)
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Priority to EP00204095A priority Critical patent/EP1209711B1/de
Priority to DE60044194T priority patent/DE60044194D1/de
Priority to AT00204095T priority patent/ATE464645T1/de
Priority to CNB011393424A priority patent/CN1327466C/zh
Publication of EP1209711A1 publication Critical patent/EP1209711A1/de
Application granted granted Critical
Publication of EP1209711B1 publication Critical patent/EP1209711B1/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
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/12—Means for indicating condition of the switch
    • H01H73/14—Indicating lamp structurally associated with the switch
    • 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
    • H01H71/127—Automatic release mechanisms with or without manual release using piezoelectric, electrostrictive or magnetostrictive trip units
    • 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
    • H01H71/04—Means for indicating condition of the switching device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/12—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by voltage falling below a predetermined value, e.g. for no-volt protection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition

Definitions

  • the present invention relates to an auxiliary device for opening the contacts of a low-voltage circuit breaker associated therewith following a command electric signal.
  • auxiliary devices are constituted by under-voltage relays and shunt tripping relays.
  • an under-voltage relays In particular, the main function of an under-voltage relays is to protect loads which are connected to a power supply line, for example electric motors, against supplying conditions which are not optimum for their operation.
  • Undervoltage relays are in fact supplied by a voltage which is correlated to the voltage of the line to which the load to be protected is connected. If the value of the line supply voltage drops below a threshold, the relay trips, causing the circuit breaker associated therewith to open and therefore interrupting the supply of power to the load; in this way, malfunctions and even damages to the load are conveniently prevented.
  • shunt tripping relays are coupled to circuit breakers so as to perform opening of the contacts and interruption of the current flow, following a remote opening command, issued for example for security reasons, by an operator which acts on push-button or on a control panel.
  • the constructive embodiment of such auxiliary devices foresees in both cases, the use of a mechanical part constituted by a kinematic mechanism, operatively coupled to the kinematism of the associated circuit breaker, and of an electromagnetic part which acts as an actuating device for the kinematic mechanism.
  • the electromagnetic part is basically formed by a fixed magnet, on which a coil is wound, and by a moving magnet which can electromagnetically couple/uncouple to/from it.
  • the coil in normal operating conditions the coil is not supplied with electric power and the moving magnet is uncoupled from the fixed one; when a remote command for opening the contacts is issued, the coil is excited by current pulses which cause the generation of a magnetic field by means of which the moving magnet is attracted by the fixed magnet. During this movement, the moving magnet actuates the kinematic mechanism which in turn transmits motion to the associated circuit breaker, thus causing the opening of the contacts.
  • the coil In the case of an under-voltage relay, in normal operating conditions, the coil is supplied with electric power so as to generate a magnetic field whose intensity allows to keep the moving magnet coupled electromagnetically to the fixed magnet. If the line supply voltage drops below a preset threshold, the intensity of the magnetic field generated by the coil is no longer sufficient to retain the moving magnet and contrast the force applied for example by a spring which pulls the moving magnet and causes its uncoupling from the fixed magnet. As previously described, also in this case the movement of the moving magnet causes actuation of the kinematic mechanism and the opening of the contacts.
  • the presence of the electromagnetic part contributes significantly to make the whole device quite cumbersome and heavy, and negatively effects the complexity of the design; further, the use of the coil and of the magnets increases the production and assembling costs.
  • the aim of the present invention is to overcome the drawbacks of the prior art and in particular to provide an auxiliary device for opening the contacts of a circuit breaker associated therewith, which has a simplified structure with respect to known auxiliary devices.
  • an object of the present invention is to provide an auxiliary device for opening the contacts of a circuit breaker associated therewith which allows to ease the design phase.
  • Another object of the present invention is to provide an auxiliary device for opening the contacts of a circuit breaker associated therewith which is less cumbersome and heavy with respect to known devices.
  • Another object of the present invention is to provide an auxiliary device for opening the contacts of a circuit breaker associated therewith which allows to reduce the production costs and to facilitate assembling.
  • Another object of the present invention is to provide an auxiliary device for opening the contacts of a circuit breaker associated therewith which is highly reliable, relatively easy to manufacture and at competitive costs.
  • the present invention relates to an auxiliary device for opening the contacts of a circuit breaker associated therewith following a command electric signal, comprising an insulating case which contains:
  • auxiliary device characterized in that said kinematic mechanism comprises:
  • the device thus conceived has a structure which is significantly simplified with respect to the prior art auxiliary devices, allowing at the same time to ease the design and to facilitate assembling, as well as to reduce the costs, without affecting in any way the performances required.
  • auxiliary device in the following description, the auxiliary device according to the invention will be described with particular reference to its use as a shunt tripping relay or as an under-voltage relay, without intending in any way to limit its possible applications.
  • the auxiliary device comprises an insulating case 1 which contains an actuating device 100, a kinematic mechanism, generally indicated by the reference numeral 200, for opening/closing the contacts of a circuit breaker associated with the device itself, and connection terminals 10 for connection with an electric line, not illustrated; in particular there are four terminals 10, three of which are illustrated in figures 1 and 2.
  • the actuating device 100 is a piezoelectric actuating device, preferably a bistable piezoelectric device.
  • piezoelectric actuating device a device which uses a piezoelectric element, a system for electrically exciting it so in order to determine its deformation, and means for exploiting the deformation of the piezoelectric element so as to produce a movemevent, which can be transmitted to further components.
  • the piezoelectric actuating device 100 comprises a structural element 2 and at least one layer of piezoelectric material 3 operatively coupled therewith.
  • the structural element 2 is preferably constituted by a thin, bistable, and substantially rectangular lamina, for example metallic, while the layer of piezoelectric material 3 may comprise a ceramic piezoelectric material, or an inorganic crystal piezoelectric material, or an organic polymer piezoelectric material.
  • the actuating device 100 comprises two layers of piezoelectric ceramic material 3 in a bimorph configuration, such as a barium or a lead zirconate titanate (PZT) piezoelectric compound, which are fixed on two corresponding opposite faces of the lamina 2, at a first end thereof, with the lamina interposed therebetween.
  • the layers 3 are electrically connected to the connection terminals 10, by means of conducting means 5, for example electrical wires; also a second end of the lamina 2, opposite to the first end, is electrically connected to the terminals 10.
  • the lamina 2 has the two substantially opposite ends 4 and 4' which are operatively coupled to the insulating case 1 in an offset position to each other with respect to a reference plane.
  • the energy that the lamina 2 requires for shifting from a first stable equilibrium position to a second one, thereby actuating the kinematic mechanism 200 is advantageously minimized.
  • the kinematic mechanism 200 comprises coupling means, which are operatively associated to the actuating device 100 and to the circuit breaker, and release means which are operatively associated to the coupling means.
  • the coupling means comprise a triggering lever 6, a coupling lever 7, and a transmission lever 8 whose functions and connections are described hereinafter.
  • the tripping lever 6, which is pivoted at a point 9 of the case 1, has a pivot 12 suitable for coupling to the associated circuit breaker, and a toothed sector 13;
  • the coupling lever 7 is pivoted at a point 11 of the case 1 and has a pivot 14 for optional coupling to the kinematic mechanism of the associated circuit breaker, and a toothed sector 15 which is operatively coupled to the toothed sector 13 of the tripping lever 6.
  • the coupling lever 7 comprises a first protruding arm 16 having a contoured end suitable for operatively interacting with the lamina 2, and a second arm 32 having a contoured end which is suitable for interacting with indication and reset means, for the purposes which will be described hereinafter.
  • the kinematic mechanism 200 has a lever which, with a single body, allows to perfom different functions, as it will appear more clearly in the following description. Alternatively it would be possible to use two or more different levers for performing the same functions.
  • the transmission lever 8 to which a return spring 25' is associated, is pivoted to a point 17 of the case 1 and is operatively connected to the circuit breaker and to the release means, respectively.
  • the release means comprise a release lever 18 which is also pivoted at the point 9 of the case 1, and a spring 26 which acts on the lever 18 itself; the release lever 18 is operatively coupled to the transmission lever 8 and to the tripping lever 6 by means of a U-shaped element 19 which can slide in a groove 20 provided on the lever 18, as illustrated in figure 3. Further, as shown in figure 3, the lever 18 is provided with a seat 21 in which a spring, not illustrated, is inserted; said spring allows to couple the movement of the levers 18-6 during opening operations, as it will be described hereinafter.
  • the kinematic mechanism 200 may further be provided with indication and reset means suitable for providing a local visual indication of the open state of the circuit breaker; in particular, said indication and reset means comprise a reset and indication lever 22 and an engagement lever 23, illustrated in figures 4 and 5 respectively.
  • the reset and indication lever 22 which is pivoted at the point 17 of the case 1, has a slot 31 suitable for interacting with a pivot 30 which is provided on the lever 18, a first raised portion 34, on which a first end of a spring 28 acts, and a second raised portion 35, which interacts against a shaped wall 36 of the engagement lever 23; moreover, the lever 22 has a shaped protrusion 60 which, when the circuit breaker opens due to a command electric signal, protrudes from a corresponding opening formed in the case 1 and therefore allows local visual indication of the tripping of the associated circuit breaker. Moreover, once the protrusion 60 has protruded from the case 1, it directly provides a button on which an operator can, for any requirement, act directly and restore the auxiliary device without having to act on the associated circuit breaker, which accordingly remains open.
  • the engagement lever 23, shown in detail in Figure 5, is pivoted at the point 11 of the case 1 and has also a pivot 50 on which the second end of the spring 28 acts.
  • the spring 28 pushes on one side against the raised portion 34, forcing the lever 22 to turn clockwise, and against the pivot 50 at the other side, forcing the lever 23 to turn counterclockwise. Accordingly, the levers 22 and 23 move against each other, facilitating contact between the raised portion 35 and the shaped wall 36 and remaining engaged in the position shown in Figure 1.
  • the auxiliary device comprises also a first fixed and a second fixed contact, both indicated by the reference numeral 24, which are electrically connected to the connection terminals 10, and a movable contact 25, for example of the laminar type suitable for coupling therewith; further, there are provided means for interacting with the moving contact 25, constituted by an interaction lever 40.
  • the lever 40 which is freely pivoted to a point 29 of the case 1, has a first end which abuts against the lamina of the contact 25, and a second end operatively engaged with a protrusion 27 of the lever 18.
  • the kinematic mechanism of the circuit breaker transmits the motion to the transmission lever 8, which rotates in the direction indicated by the arrow 101, pulling the U-shaped element 19.
  • the release lever 18, under the action of the U-shaped element 19, rotates about its own pivoting axis 9, in the direction indicated by the arrow 102; at the same time, the levers 6 and 7 also rotate in mutually opposite directions, causing the meshing of the two toothed sectors 13 and 15.
  • the remaining part of the mechanism is substantially not affected by the movement.
  • the rotation of the release lever 18 causes the disengagement of its protrusion 27 from one end of the lever 40 itself; in this way, the lever 40 releases the lamina 25, which by means of its elastic loading facilitates the switching of the moving contact 25 from the first fixed contact 24 to the second one.
  • a command electric signal is supplied to the layer of piezoelectric materials 3.
  • the piezoelectric layers 3 deform so as to determine a shifting of the bistable lamina 2 from a first stable equilibrium position, illustrated in figure 1, to a second stable equilibrium position (not illustrated); during this transition, the lamina 2 interacts with the contoured end 16 of the coupling lever 7, thus transmitting movement to it.
  • the lever 7 starts rotating and its toothed sector 15 meshes with the toothed sector 13 of the coupling lever 6; thus, the two toothed sectors 13 and 15 rotate in mutually opposite directions with respect to each other and transmit movement to the kinematic mechanism of the associated circuit breaker which can be operatively coupled to the pivot 12 or to the pivot 14 according to the internal positioning of its electric poles.
  • the tripping lever 6 disengages the U-shaped element 19, which becomes able to slide freely in the groove 20 of the lever 18.
  • the release lever 18, no longer locked by the U-shaped element 19, rotates under the action of the spring 26 in the direction indicated by the arrow 102 and simultaneously facilitates a faster rotation of the lever 6; as previously indicated this simultaneous rotation is achieved by means of a spring, not shown, arranged in the seat 21 of the lever 18.
  • the lever 40 if present, once its end has disengaged from the protrusion 27, releases the moving contact 25, which moves from the first fixed contact 24 to the second one; in this situation, the four-terminal configuration allows to visually indicate by means of a suitable electric circuit, to a remotely located operator the change of state of the circuit breaker; this indication can be easily achieved by means of two lamps of mutually different colors which indicate an open or closed state of the circuit breaker.
  • the lever 22 disengages from the lever 23, and under the action of the spring 28 on the raised portion 34, rotates about the pivoting axis 11, so as the shaped protrusion 60 protrudes from the case 1 through a suitable opening, providing a local visual indication that the contacts of the circuit breaker are separated.
  • the transmission lever 8 following the movement of the associated circuit breaker, reaches a position not shown in Figures, in which the U-shaped element 19 re-engages the levers 6 and 18.
  • the device can also be reset by acting on the control knob of the circuit breaker.
  • the movement is transmitted from the circuit breaker to the transmission lever 8 which pushes the lever 18 by means of the U-shaped element 19; the pivot 30, during the movement of the lever 18, acts against the surface of the slot 31 of the lever 22 and pulls it downward, causing it to rotate.
  • the raised portion 35 couples to the shaped wall 36, as described earlier.
  • the protrusion 27 engages the end of the lever 40 which, by rotating about its pivoting axis, acts on the lamina of the moving contact 25 and returns it onto the fixed contact 24.
  • the auxiliary device according to the invention fully achieves the intended aim and objects giving several advantages with respect to the prior art devices.
  • the use of a piezoelectric actuating device 100 coupled with the kinematic mechanism 200 previously described allows to simplify the structure of the whole device, which results less cumbersome and heavy.
  • the design is facilitated, and thanks to the reduction of pieces used also for the kinematic mechanism, the production and assembling costs are reduced too.
  • auxiliary device thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept; all the details may also be replaced with other technically equivalent elements.
  • the materials employed, as well as the dimensions, may be any according to requirements and to the state of the art.

Landscapes

  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Eye Examination Apparatus (AREA)
  • Telephone Function (AREA)
  • Massaging Devices (AREA)
EP00204095A 2000-11-21 2000-11-21 Hilfseinrichtung Expired - Lifetime EP1209711B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP00204095A EP1209711B1 (de) 2000-11-21 2000-11-21 Hilfseinrichtung
DE60044194T DE60044194D1 (de) 2000-11-21 2000-11-21 Hilfseinrichtung
AT00204095T ATE464645T1 (de) 2000-11-21 2000-11-21 Hilfseinrichtung
CNB011393424A CN1327466C (zh) 2000-11-21 2001-11-21 辅助装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP00204095A EP1209711B1 (de) 2000-11-21 2000-11-21 Hilfseinrichtung

Publications (2)

Publication Number Publication Date
EP1209711A1 true EP1209711A1 (de) 2002-05-29
EP1209711B1 EP1209711B1 (de) 2010-04-14

Family

ID=8172292

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00204095A Expired - Lifetime EP1209711B1 (de) 2000-11-21 2000-11-21 Hilfseinrichtung

Country Status (4)

Country Link
EP (1) EP1209711B1 (de)
CN (1) CN1327466C (de)
AT (1) ATE464645T1 (de)
DE (1) DE60044194D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100475072B1 (ko) * 2002-12-14 2005-03-10 엘지산전 주식회사 모터 보호용 차단기의 부속장치

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4012051B2 (ja) * 2002-11-27 2007-11-21 三菱電機株式会社 回路遮断器およびそれに外付形付属器を組み合わせた回路遮断装置
CN111769011B (zh) * 2020-06-06 2022-04-15 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） 一种限流式断路器用快速脱扣器
CN113205978A (zh) * 2021-04-01 2021-08-03 浙江天正电气股份有限公司 一种内置辅助功能的断路器及其报警系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161946A1 (de) * 1984-03-26 1985-11-21 Telemecanique An einen Schutzschalter ankuppelbare Zusatzeinheit
EP1014412A2 (de) * 1998-12-24 2000-06-28 ABB Ricerca SpA Bistabile Betätigungsvorrichtung
EP1017080A2 (de) * 1998-12-29 2000-07-05 ABB Ricerca SpA Hilfseinrichtung
EP1017079A2 (de) * 1998-12-29 2000-07-05 ABB Ricerca SpA Hilfseinrichtung für Leistungsschalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0161946A1 (de) * 1984-03-26 1985-11-21 Telemecanique An einen Schutzschalter ankuppelbare Zusatzeinheit
EP1014412A2 (de) * 1998-12-24 2000-06-28 ABB Ricerca SpA Bistabile Betätigungsvorrichtung
EP1017080A2 (de) * 1998-12-29 2000-07-05 ABB Ricerca SpA Hilfseinrichtung
EP1017079A2 (de) * 1998-12-29 2000-07-05 ABB Ricerca SpA Hilfseinrichtung für Leistungsschalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100475072B1 (ko) * 2002-12-14 2005-03-10 엘지산전 주식회사 모터 보호용 차단기의 부속장치

Also Published As

Publication number Publication date
DE60044194D1 (de) 2010-05-27
ATE464645T1 (de) 2010-04-15
EP1209711B1 (de) 2010-04-14
CN1354489A (zh) 2002-06-19
CN1327466C (zh) 2007-07-18

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