EP0773571B1 - Mécanisme de déclenchement, en particulier pour disjoncteur à courant de défaut - Google Patents

Mécanisme de déclenchement, en particulier pour disjoncteur à courant de défaut Download PDF

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Publication number
EP0773571B1
EP0773571B1 EP96810587A EP96810587A EP0773571B1 EP 0773571 B1 EP0773571 B1 EP 0773571B1 EP 96810587 A EP96810587 A EP 96810587A EP 96810587 A EP96810587 A EP 96810587A EP 0773571 B1 EP0773571 B1 EP 0773571B1
Authority
EP
European Patent Office
Prior art keywords
spring
armature
plunger
magnetic
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.)
Expired - Lifetime
Application number
EP96810587A
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German (de)
English (en)
Other versions
EP0773571A1 (fr
Inventor
Willy Schwarz
Dominique Girardin
Siegfried Mayer
Gerhard Schneider
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 Schweiz AG
Original Assignee
ABB Schweiz AG
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 Schweiz AG filed Critical ABB Schweiz AG
Publication of EP0773571A1 publication Critical patent/EP0773571A1/fr
Application granted granted Critical
Publication of EP0773571B1 publication Critical patent/EP0773571B1/fr
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
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part

Definitions

  • the invention is based on a trigger, especially for a residual current device (RCD), according to the preamble of claim 1.
  • a trigger exhibits a constant magnetic flux leading magnetic circuit with a fixed yoke and a movable armature on as well as one on the magnetic circuit acting trip coil.
  • a trigger variable such as a fault current
  • a signal fed In the release coil is when you occur a trigger variable, such as a fault current, a signal fed.
  • This input signal generates in the trip coil a magnetic flux, which is the permanent magnetic flux on Anchor location weakens. That of a pre-tensioned spring loaded anchor will weaken the magnetic Continuous flow is lifted from the yoke and releases a pestle mechanical actuation of a device.
  • the plunger acts on a key switch, which opens the Contact arrangement of the FI switch causes. That of the trip coil input signal is proportional to the Residual current and is from a residual current transformer of the RCD educated.
  • the invention takes on a prior art of trigger devices for FI switches, as described in EP 0228 345 B1 and reprinted from “etz” issue no.13 (1984) "Residual current circuit breaker: Constructive solutions, trends and principles for your applications "Dr.J.Feitknecht c / o CMC, Schaffhausen, is described.
  • the triggers described act on a preloaded coil tension spring when the magnetic circuit is closed, the anchor with a Force which is the anchor against the force of the magnetic Lift the continuous magnetic flow from the yoke and want to open the magnetic circuit.
  • This spring also serves the drive of the after opening the magnetic circuit on the Switch lock of the RCD acting plunger.
  • the spring Since this is a relatively large force is necessary, the spring demonstrates closed magnetic circuit a considerable bias on. If a fault current occurs, it can then take off of the anchor from the yoke with the preloaded spring over the anchor act on the plunger with a force sufficient to Trigger switch lock and the contact arrangement of the FI switch to open.
  • the high preload requires a strong one magnetic circuit and accordingly a powerful one Summation current transformer with a high output power. This Output power must be at least so large that that of the Tripping coil by the current supplied by the summation current transformer formed and coupled into the magnetic circuit Flow the continuous magnetic flow in a circle so far can compensate that the magnetic holding force is less than the preload force generated by the spring.
  • a triggering device published in DE 27 10 869 A1 a latching relay which corresponds to the closest prior art according to the preamble of claim 1 has one with one in the operating state Coil spring preloaded anchor as well as a slight one bent bending leaf spring. When triggered, the strikes Anchor on the bending leaf spring and causes the spring to jump over now act with great force on a plunger of the switch Feather.
  • the invention as set out in the claims is based on the task of a trigger, especially for to create an FI switch, which is simple and small dimensions and high responsiveness distinguished.
  • the trigger according to the invention is simple and needs only low to generate large output power Input power. Accordingly, all input power determinants Elements, such as the residual current transformer of the RCD, and all elements determined by the input power, like a permanent magnet feeding the magnetic circuit, small dimensioned, and can also be small fault currents with large Security can be detected and switched off. Because of the Triggers according to the invention delivered great power in a FI switch equipped with such a release robust and therefore particularly reliable switch lock be used.
  • Trigger has a trough-shaped bottom 1 and one Cover 2 existing insulating housing.
  • the lid 2 is an opening 3 is provided which the vertical guidance of a cylindrical plunger 4 is used.
  • the plunger 4 has thickened lower end, which on one as bow-shaped curved leaf spring and designed as a snap spring 5 acting spring element sits.
  • the upward end of the plunger 4 acts on a contact arrangement via a key switch a FI switch, not shown.
  • the ram 4 is a particularly simple embodiment of one in the trigger used and in an alternative version, for example as Articulated transmission member.
  • the spring 5 has two blade ends 6 and a central part acting on the ram 4 7 on. On the central part 7 there are fasteners not shown intended to hold a cuboid trained armature 8 of a magnetic circuit on the from Side of the central part facing away from the tappet 7.
  • the reference numeral 9 is an intermediate floor made of insulating material denotes which serves to hold a release coil 10, and which two led up and the attachment of the spring Has 5 enabling projections 11, 12.
  • the magnetic circle contains in addition to the armature 8 also one of two yoke plates 13, 14 and a magnetically poorly conductive air gap disk 15 formed yoke 16 and a constant permanent magnetic flux cuboid permanent magnet 17 feeding into the yoke 16.
  • the Ram 4 with its flared lower end on one biased damping spring 28 supported.
  • the damping spring 28 is centered on the side facing the ram 4 Middle part 7 of the spring 5 arranged.
  • the spring 5 is with their both ends 6 clamped in guides which in the projections 11 and 12 are incorporated.
  • the trip coil 10 is with the help of two power connections 29 led through the base 1 electrical power, which occurs when a Residual current is formed in the total current transformer.
  • switch lock is also Contact arrangement of the FI switch, not shown, opened.
  • the current becomes one Consumer and at the same time interrupted by the summation current transformer. Accordingly, the trip coil 10 does not Input power supplied.
  • the permanent magnet 17, the Yoke 16 and the armature 8 formed magnetic circuit is open, since the armature by the biased spring 5 of pole faces 30 of Yokes 16 has been removed.
  • the trigger By pushing the plunger into that of base 1 and cover 2 formed housing, the trigger can be reloaded. At the Pressing in the plunger 4 becomes the one that serves as an energy store Spring 5 is charged and at the same time the magnetic circuit through Pressing the armature 8 closed on the pole faces 30. unwanted Impact forces and associated damage to the Pole surfaces are avoided by the damping spring 28 (Fig.3).
  • the spring 5 is curved in such a way that it has the non-linear and at least sectionally negative spring characteristic curve shown in FIG. 4, shown in solid lines.
  • the working point of the spring 5 is in the rising part of the characteristic in a position in which the plunger 4 is held up with a large force F I.
  • F I a large force
  • a maximum when charging the spring characteristic exceeded and the operating point in the negative range of the characteristic curve can be the negative areas of the spring characteristic run differently. It is particularly important that after the Charging the operating point lies in an area of the characteristic curve, in which a force acts that forces the armature 8 from the pole faces 30 want to stand out, and the small compared to the especially in The maximum force of the characteristic is. This is in generally the case when the working point of the spring 5 in negative range is just above the zero crossing of the force F. As a result, there is an abortion acting on the armature 8 Ensures strength and secondly ensures that this Force is low.
  • Springs 5 with non-linear, at least partially negative, characteristic curves are particularly favorable, in which the operating point in the charged state of the trigger can be set close to zero force, since then yoke 16 and permanent magnet 17 need only have a particularly low magnetic holding force F ' II ,
  • Such springs can be designed as a snap spring. The working point can be set back to a minimum of the characteristic curve if it is designed as a bow-shaped snap spring.
  • the characteristic curve has a zero crossing, as is possible, for example, in the case of a plate spring, the magnetic holding force F '' II may be relatively low, but because of the steep rise in the characteristic curve in the area of the zero crossing, the working point must be set higher for safety reasons , This is particularly so because, for manufacturing reasons, the characteristic curve of the spring 5 deviates within a certain tolerance range from the characteristic curve of a correspondingly produced and essentially equivalent spring.
  • FIGS. 5 and 6 show a spring element which can be used in a particularly advantageous manner in the trigger according to the invention.
  • This spring element consists of two interacting springs 32 and 33, of which the spring 32, which is preferably designed as a snap or plate spring, has a non-linear, at least sectionally negative spring characteristic F 32 and the spring 33, preferably designed as a coil spring, has a linear spring characteristic F 33 .
  • the spring 32 is clamped on the projections 11, 12 in accordance with the spring 5 and carries the armature 8 in its central part on the side facing the magnetic circuit.
  • the spring 33 is supported at its lower end on the yoke plates 13, 14 and is supported with it from its upper end with a prestressing force on the armature 8
  • the biasing force of the spring 33 is now dimensioned by suitable dimensioning such that the spring element formed by the springs 32 and 33 has the spring characteristic F 32 + F 33 shown in FIG. 6 and formed by superimposing the two spring characteristics F 32 and F 33 .
  • This spring characteristic corresponds to the spring characteristic described in FIG. 4 in connection with the forces F I and F II .
  • the spring element formed from the springs 32 and 33 has the additional advantage that the working point of the snap or plate spring 32 in the loaded position can be suitably dimensioned by the biasing force exerted by the spring 33 State of the trigger is certainly kept in the positive force range. In this way, a reliable response of the trigger according to the invention is always guaranteed, regardless of fluctuations in the manufacturing process in the manufacture of the snap or plate spring 32.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Control Of El Displays (AREA)
  • Arc Welding Control (AREA)

Claims (2)

  1. Déclencheur, plus particulièrement pour un disjoncteur différentiel, comprenant
    un circuit magnétique dans lequel passe un flux magnétique continu constant et contenant un joug fixe (16) et un induit mobile (8),
    une bobine de déclenchement (10) qui agit sur le circuit magnétique pour former un flux magnétique d'affaiblissement le flux magnétique continu à l'endroit de l'induit (8) en cas d'apparition d'une grandeur de déclenchement, plus particulièrement un courant de défaut,
    un élément ressort précontraint pour exercer une charge sur l'induit (8) contre une force produite par le flux magnétique continu et pour ouvrir le circuit magnétique en soulevant l'induit (8) du joug (16) en cas d'apparition d'une grandeur de déclenchement,
    un poussoir (4) qui peut être déclenché par l'induit (8) qui se soulève pour actionner un appareil, plus particulièrement un verrou de maintien du disjoncteur différentiel, et avec un ressort à déclic (5, 32) qui est réalisé sous la forme d'un ressort à lames courbé en étrier et dont les extrémités (6) sont logées dans les attaches (11, 12) et qui agit sur le poussoir avec une pièce centrale (7),
    caractérisé en ce que l'élément ressort contient le ressort à déclic (5, 32) et que la pièce centrale (7) comporte l'induit (8) sur le côté qui est opposé au poussoir (4) et un ressort amortisseur (28) sur le côté qui fait face au poussoir (4).
  2. Déclencheur selon la revendication 1, caractérisé en ce que l'élément ressort, outre le ressort à déclic (32), présente un ressort hélicoïdal (33) qui exerce une force de précontrainte sur le ressort à déclic (32).
EP96810587A 1995-11-09 1996-09-06 Mécanisme de déclenchement, en particulier pour disjoncteur à courant de défaut Expired - Lifetime EP0773571B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19541789 1995-11-09
DE19541789 1995-11-09

Publications (2)

Publication Number Publication Date
EP0773571A1 EP0773571A1 (fr) 1997-05-14
EP0773571B1 true EP0773571B1 (fr) 2002-10-30

Family

ID=7777025

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96810587A Expired - Lifetime EP0773571B1 (fr) 1995-11-09 1996-09-06 Mécanisme de déclenchement, en particulier pour disjoncteur à courant de défaut

Country Status (3)

Country Link
EP (1) EP0773571B1 (fr)
AT (1) ATE227048T1 (fr)
DE (1) DE59609833D1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1192301B (de) * 1964-04-28 1965-05-06 August Stuke Fehlerstrom-Schutzschaltung
US3293577A (en) * 1965-09-21 1966-12-20 Gen Electric Undervoltage release for circuit breaker
DE7707671U1 (de) * 1977-03-12 1982-09-09 Felten & Guilleaume Energietechnik GmbH, 5000 Köln Hochempfindlich einstellbares elektrisches Haftrelais
EP0228345B1 (fr) * 1985-12-13 1989-08-30 CMC Carl Maier + Cie AG Mécanisme de déclenchement magnétique pour disjoncteur à courant de défaut
US5343179A (en) * 1993-01-29 1994-08-30 Eaton Corporation Miniaturized solenoid operated trip device

Also Published As

Publication number Publication date
EP0773571A1 (fr) 1997-05-14
DE59609833D1 (de) 2002-12-05
ATE227048T1 (de) 2002-11-15

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