EP0293702B1 - Elektromagnetischer Auslöser für einen Fehlerstromschutzschalter - Google Patents

Elektromagnetischer Auslöser für einen Fehlerstromschutzschalter Download PDF

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Publication number
EP0293702B1
EP0293702B1 EP19880108178 EP88108178A EP0293702B1 EP 0293702 B1 EP0293702 B1 EP 0293702B1 EP 19880108178 EP19880108178 EP 19880108178 EP 88108178 A EP88108178 A EP 88108178A EP 0293702 B1 EP0293702 B1 EP 0293702B1
Authority
EP
European Patent Office
Prior art keywords
yoke
armature
layer
hard material
release
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
EP19880108178
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0293702A1 (de
Inventor
Franz Doepke
Manfred Dipl.-Ing. Tu Schmidt
Wolfgang Dr.-Ing. Bosch
Bruno Dipl.-Wirtsch.-Ing. Gengenbach
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.)
Doduco Solutions GmbH
Original Assignee
Doduco GmbH and Co KG Dr Eugen Duerrwaechter
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
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Application filed by Doduco GmbH and Co KG Dr Eugen Duerrwaechter filed Critical Doduco GmbH and Co KG Dr Eugen Duerrwaechter
Publication of EP0293702A1 publication Critical patent/EP0293702A1/de
Application granted granted Critical
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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
    • H01H71/327—Manufacturing or calibrating methods, e.g. air gap treatments

Definitions

  • the invention is based on a trigger with the features specified in the preamble of claim 1.
  • a trigger has become known from DE-27 55 645 B2.
  • it also contains a permanent magnet which lies against the yoke; the magnetic force flow emanating from this permanent magnet causes the armature to be attracted by the yoke against the action of a return spring acting on the armature.
  • a trip coil surrounding the yoke is provided.
  • the tripping coil has the task of generating a power flow that is dependent on the fault current and that is opposite to the power flow emanating from the permanent magnet, so that the force with which the armature is attracted by the yoke is reduced and the return spring can pull the armature off the yoke.
  • the air gap between the armature and the yoke should be as small as possible.
  • the response sensitivity of the trigger should remain constant for as long as possible.
  • the surfaces of the pole faces of the armature or yoke with a corrosion-resistant and tough material with good sliding properties, namely with a metal of the first, second or eighth subgroup of the periodic system of the elements or their alloys with a layer thickness of up to 1 ⁇ m.
  • the group of precious metals, especially gold is intended, which should be deposited by electrolytic deposition or by vapor deposition.
  • the coating is intended to achieve a lubricating effect so that no abrasion is formed during the long service life and the air gap remains constant. It is stated in DE-27 55 645 B2, however, that the thin coating is not sufficient for corrosion protection, since it is not pore-free. In order to avoid corrosion, which could also change the air gap, it is therefore intended to use corrosion-resistant materials both as a soft magnetic material for the armature and for the yoke and for the coating. Applying thicker coatings that could provide effective protection against corrosion is forbidden since they would reduce the sensitivity of the trigger.
  • the invention has for its object to provide an electromagnetic trigger for residual current circuit breaker that can be produced with reasonable effort and the air gap has an improved temporal consistency.
  • the problem of the temporal constancy of the air gap can be overcome with a thin hard material coating on the pole faces of the armature and the yoke.
  • the hard material layers are so wear-resistant, in particular abrasion-resistant, in comparison to the mechanical loads occurring during the triggering process and when the residual current circuit breaker is switched on, that the time constancy of the air gap is drastically extended in comparison to known triggers.
  • the optimal layer thickness is between 0.4 ⁇ m and 0.8 ⁇ m.
  • already with such thin Hard material layers can achieve a significant improvement in the corrosion resistance of the yoke and the anchor.
  • the vapor-deposited hard material layers can in fact form a pore-free film even with layer thicknesses less than the electrolytically applied layers described in DE-27 55 645 B2.
  • Titanium hard materials in particular titanium nitride, are preferably selected for the hard material layer.
  • carbides and carbon nitrides of titanium are also very suitable.
  • CVD method chemical vapor deposition
  • PVD method physical vapor deposition
  • CVD processes may require working at higher temperatures, but they make it possible to specifically influence the surface structure, namely the micro-roughness, by varying the deposition parameters (temperature, pressure, coating time) in the CVD reactor. This is also a targeted influence on the air gap and - related to it -
  • the trigger sensitivity of the trigger is possible, whereby the set sensitivity remains long-term stable due to the hard surface. Initial tests have shown that the long-term stability of the triggering threshold of the trigger can be increased by a factor of 5 to 25 by means of the hard material coating according to the invention compared to known triggers.
  • the accompanying drawing shows schematically an electromagnetic release consisting of an armature 1, a yoke 2, a permanent magnet 3 for generating the magnetic flux, by the action of which the armature 1 is attracted to the yoke 2 and adheres to it, as long as not by one on one leg of the yoke 2 arranged trigger coil 4 an oppositely directed magnetic force flow is generated, the size of which is dependent on a fault current. If such a fault current occurs, the magnetic force flow emanating from the permanent magnet 3 is weakened and a return spring 5, which acts on the armature 1, can pull the armature 1 off the yoke 2 and thereby interrupt a circuit to be monitored.
  • the permanent magnet 3 resets the armature 1 by pulling it against the yoke 2.
  • their surfaces there have a thin layer of a hard material. Examples are given below.
  • a hard material layer is preferably applied to the relevant surfaces of both the armature 1 and the yoke 2 after they have been ground and polished flat.
  • the carefully cleaned anchors and yokes are deposited on supports in an evacuable coating chamber of a vacuum coating system as substrates to be coated.
  • the chamber is evacuated and, after reaching a vacuum of the order of 10 ⁇ 6 mbar, argon is introduced at a pressure of approx. 1 x 10 ⁇ 2 mbar for sputter etching of the substrates.
  • High frequency etching takes place at about 1500 V for 10 minutes, as a result of which the oxide layers on the substrates are detached.
  • a 0.5 ⁇ m thick titanium nitride layer is generated for about 10 minutes at a power of about 10 W / cm2.
  • the PVD coating applies a surface layer in which the substrate geometry or topography is essentially imaged, ie only relatively small changes in the micro roughness take place.
  • the coating times given above refer to the operation with a fixed substrate carrier, in continuous or batch systems with drum holders the coating times are extended according to the areas currently in engagement (in relation to the total area of the substrate carriers).
  • the carefully cleaned anchors and yokes are deposited on supports in an evacuable coating chamber as substrates to be coated.
  • the chamber is evacuated and after reaching a rough vacuum of approx. 1 mbar pressure, hydrogen is introduced into the chamber and the chamber is heated to 860 ° C. under a hydrogen atmosphere at a pressure of approx. 200 mbar.
  • nitrogen and titanium tetrachloride (TiCl4) are introduced into the chamber, the ratio of hydrogen to nitrogen being about 3.5: 1, and a pressure of 900 mbar is set in the chamber. Under this pressure and the At a temperature of 860 ° C, titanium nitride is deposited on the substrates.
  • the thickness of the titanium nitride layer has increased to 0.5 ⁇ m.
  • the chamber is then rinsed with cold argon and cooled, and the coated parts are removed. Their micro roughness is slightly increased compared to the uncoated parts.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Physical Vapour Deposition (AREA)
  • Contacts (AREA)
  • Chemical Vapour Deposition (AREA)
EP19880108178 1987-05-29 1988-05-21 Elektromagnetischer Auslöser für einen Fehlerstromschutzschalter Expired - Lifetime EP0293702B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3718204 1987-05-29
DE3718204 1987-05-29
DE19873719946 DE3719946A1 (de) 1987-05-29 1987-06-15 Elektromagnetischer ausloeser fuer einen fehlerstromschutzschalter
DE3719946 1987-06-15

Publications (2)

Publication Number Publication Date
EP0293702A1 EP0293702A1 (de) 1988-12-07
EP0293702B1 true EP0293702B1 (de) 1992-05-06

Family

ID=25856163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880108178 Expired - Lifetime EP0293702B1 (de) 1987-05-29 1988-05-21 Elektromagnetischer Auslöser für einen Fehlerstromschutzschalter

Country Status (3)

Country Link
EP (1) EP0293702B1 (es)
DE (2) DE3719946A1 (es)
ES (1) ES2031952T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004017779A1 (de) * 2004-04-13 2005-11-10 Siemens Ag Auslöserelais

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT403534B (de) * 1991-01-16 1998-03-25 Biegelmeier Gottfried Fehlerstromschutzschalter
FR2793947B1 (fr) * 1999-05-20 2002-03-15 Thermocompact Sa Relais a haute sensibilite, et procede pour sa fabrication
DE10210826A1 (de) * 2002-03-12 2003-09-25 Abb Patent Gmbh Auslöseeinrichtung für einen Fehlerstromschutzschalter und Verfahren zu dessen Herstellung
DE102012009665B4 (de) 2012-05-12 2022-04-07 Doepke Schaltgeräte GmbH Elektrisches Auslöserelais für einen Schalter, insbesondere für einen Schutzschalter zum Überwachen elektrischer Netze

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440362A1 (de) * 1974-08-23 1976-03-04 Licentia Gmbh Elektromagnet
DE2755645B2 (de) * 1977-12-14 1980-02-07 Schutzapparate-Gesellschaft Paris + Co Mbh Kg, 5885 Schalksmuehle Elektromagnetischer Auslöser, insbesondere Haltemagnetauslöser für Fehlerstromschutzschalter
DE3410596A1 (de) * 1984-03-22 1985-09-26 Siemens Ag Elektromagnetischer ausloeser fuer fehlerstromschutzschalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004017779A1 (de) * 2004-04-13 2005-11-10 Siemens Ag Auslöserelais

Also Published As

Publication number Publication date
DE3870707D1 (de) 1992-06-11
DE3719946A1 (de) 1988-12-22
ES2031952T3 (es) 1993-01-01
DE3719946C2 (es) 1991-10-31
EP0293702A1 (de) 1988-12-07

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