EP0309383A1 - Déclencheur électromagnétique pour un disjoncteur de puissance à basse tension - Google Patents

Déclencheur électromagnétique pour un disjoncteur de puissance à basse tension Download PDF

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Publication number
EP0309383A1
EP0309383A1 EP88730202A EP88730202A EP0309383A1 EP 0309383 A1 EP0309383 A1 EP 0309383A1 EP 88730202 A EP88730202 A EP 88730202A EP 88730202 A EP88730202 A EP 88730202A EP 0309383 A1 EP0309383 A1 EP 0309383A1
Authority
EP
European Patent Office
Prior art keywords
coil
switching device
low
circuit breaker
conductor
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
EP88730202A
Other languages
German (de)
English (en)
Other versions
EP0309383B1 (fr
Inventor
Martin Dipl.-Ing. Böttcher
Karl-Heinz Dipl.-Ing. Manthe
Bernhard Dr.-Ing. Pfeiffer
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP0309383A1 publication Critical patent/EP0309383A1/fr
Application granted granted Critical
Publication of EP0309383B1 publication Critical patent/EP0309383B1/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
    • H01H71/2481—Electromagnetic mechanisms characterised by the coil design
    • 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
    • H01H71/2472—Electromagnetic mechanisms with rotatable armatures

Definitions

  • the invention relates to an electromagnetic release of a low-voltage switching device with a magnetizable core and a coil enclosing it with at least one turn as part of the current path of the switching device.
  • Electromagnetic releases of this type are known in a number of different embodiments.
  • the design of the winding formed by the conductor depends on the rated current and the related short-circuit current at which the switching device is to be triggered. It has been found that the electromagnetic triggers for switching devices with a higher nominal current can often have a simpler design than the triggers for switching devices with a lower nominal current. This is due to the fact that, with a sufficiently high current, it is sufficient to provide an elongated conductor with, for example, a U-shaped iron yoke in order to obtain a force sufficient to solve the mechanical latching of the switching device by means of a hinged armature opposite the pole faces of the yoke. With a low short-circuit current, on the other hand, it is necessary to insert coils with several turns into the current paths of the switching device in order to generate the same or a similarly large force for tripping.
  • the invention is based on the issue of simplifying the electromagnetic release to such an extent that the use of a winding machine is unnecessary.
  • the conductor is a multi-wire insulated conductor and in that the turns are arranged in an enveloping body which forms a radial support.
  • Such conductors which are generally referred to as strands, have the property of low flexural rigidity and can therefore be wrapped around a core or bobbin with little effort, both manually and mechanically, to form a coil.
  • a coil which is formed from a flexible conductor, will generally have a lower mechanical strength than the electrodynamic stress to be expected due to short-circuit currents, unless a significant pretension is used during winding. The occurring radially outward forces can, however, be easily absorbed by the enveloping body. This ensures that neither the coil itself nor adjacent components of the switching device can be damaged.
  • the enveloping body can be formed by a recess in a carrier of the trigger of the switching device. In this case, radial support is created by inserting the coil into the recess.
  • the enveloping body can be designed as a separate protective tube. This embodiment is particularly suitable in the event that the electromagnet of the trigger is pre-assembled Assembly to be installed in a switching device.
  • Figure 1 shows a section through a low-voltage circuit breaker in a compact design (MCCB) with an electromagnetic release.
  • MCCB compact design
  • FIGS 2 and 3 show examples of coils which are intended for use in electromagnetic triggers.
  • FIG. 4 shows in detail a section through a conductor which is provided for forming the coil of an electromagnet.
  • a lower housing part 2 and an upper housing part 3 are shown as part of a low-voltage circuit breaker 1.
  • the lower housing part 2 contains the current path of the circuit breaker 1, which, starting from a connecting device 4, comprises the following parts: Fixed switching piece 5, movable switching lever 6, flexible current band 7, clamping piece 10, electromagnet 11, connecting bracket 12 and connecting device 13.
  • the electromagnet 11 is an integral part of a trigger designated as a whole by 8.
  • the electromagnet 11 interacts with a hinged armature 14, which is pivotally mounted in a cutting-like manner in a recess 15 and cooperates with a release shaft 16 at its free end.
  • the trigger shaft 16 influences in a known manner the latching of a key switch, which has been omitted in FIG. 1 to simplify the drawing.
  • Latchable switch locks are known in numerous designs, so that in the present context thereof can be disregarded to present and explain details of such a switch lock.
  • the electromagnet 11 has a U-shaped iron core 20 with pole faces 21 with which the hinged armature 14 interacts.
  • a coil 22 which is formed from several turns of an insulated stranded wire.
  • An additional core insulation 23 can be provided between the turns of the coil 22 and the iron core 20.
  • the coil 22 is formed by a portion of a flexible, insulated conductor of suitable length immediately, i.e.. H. by hand or by means of an appropriate manipulator or robot, around the iron core 20.
  • This process can be carried out easily without an otherwise usual winding machine, because the stranded wire has only a low bending stiffness and the windings can thus be applied tightly against the iron core 20 and in succession.
  • It is essential here that the subsequent parts of the current path of the circuit breaker 1 can already be connected to the stranded conductor. In the example shown, it is therefore possible to start with the manufacture of the coil 22 from an assembly which comprises a stranded conductor of suitable length and further parts connected to it at the ends, in particular the clamping piece 10 and the connection bracket 12.
  • the electromagnet 11 obtains sufficient strength against the electrodynamic stress caused by short-circuit currents through its installation in a suitable recess 25 of an insulating body 26, which is designed as a carrier of the electromagnetic release of the circuit breaker 1.
  • the Carrier 26 can be mounted as a block in the lower housing part 2. But it is also possible to design the circuit breaker 1 so that the recess 25 is provided in the lower housing part 2 itself.
  • the recess 25 is closed off by a closure piece 27, so that good protection against damage to the coil 22 is also ensured here.
  • the coil 30 shown in FIG. 2 likewise consists of an insulated, flexible stranded conductor which is wound onto a coil former 31.
  • a central opening 32 of the coil former 31 serves to receive an iron core.
  • the coil 30 is supported in the radial direction by an enveloping body in the form of a tube section 33 which is adapted in diameter.
  • the direction in which the tube section 33 is pushed over the coil 30 is indicated by an arrow 34 in FIG.
  • the tube section 33 is provided with a recess 35 on its front face.
  • the pipe section 33 can consist, for example, of an insulating material.
  • an electromagnet After inserting an iron core into the opening 32 of the coil former 31 and attaching pole pieces, an electromagnet is thus created which can interact with a hinged armature in the same way as the electromagnet 11 shown in FIG.
  • a pipe section 33 made of insulating material one made of magnetizable material, in particular a soft magnetic iron sheet, then, likewise after inserting an iron core into the opening 32, the one end of this iron core in connection with an end face of the pipe section 33 as a pole face to be used.
  • This arrangement is suitable for linear release movements.
  • the coil 30 can be provided with a movable iron core serving as a plunger anchor in order to generate a triggering movement for a switching device.
  • electromagnets with a rectangular or square design can also be produced in this way.
  • An example of this is shown in FIG. 3, in which a tubular section 36 with a square cross section is selected to support a correspondingly shaped coil.
  • this tube section there is a web-like extension 37 with fastening holes 40.
  • a coil can also be used advantageously to form an electromagnetic release.
  • FIG. 4 shows a short section of a multi-wire insulated conductor as is suitable for the purposes of the invention.
  • the conductor 41 has a number of thin copper wires 42, as are required to produce the required conductor cross section. This ensures good flexibility despite a considerable overall cross section.
  • An insulating jacket 43 surrounds the conductors 42 and at the same time is able to perform the task of core insulation and winding insulation. As already mentioned, additional core insulation can be provided. Insulating plastics with good heat resistance are particularly suitable for the insulating jacket 43, since the coil of the electromagnetic release is part of the current path in a low-voltage circuit breaker and consequently significant heating is to be expected.
  • 1 is particularly suitable for connecting sections of the line 41 to further components of the current path of a circuit breaker in accordance with FIG. 1, in which the application of heat remains essentially limited to the welding point and there is therefore no fear of damage to the insulating jacket 43.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Transformers For Measuring Instruments (AREA)
EP88730202A 1987-09-22 1988-09-06 Déclencheur électromagnétique pour un disjoncteur de puissance à basse tension Expired - Lifetime EP0309383B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3732256 1987-09-22
DE19873732256 DE3732256A1 (de) 1987-09-22 1987-09-22 Elektromagnetischer ausloeser eines niederspannungs-schaltgeraetes

Publications (2)

Publication Number Publication Date
EP0309383A1 true EP0309383A1 (fr) 1989-03-29
EP0309383B1 EP0309383B1 (fr) 1993-04-28

Family

ID=6336823

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88730202A Expired - Lifetime EP0309383B1 (fr) 1987-09-22 1988-09-06 Déclencheur électromagnétique pour un disjoncteur de puissance à basse tension

Country Status (2)

Country Link
EP (1) EP0309383B1 (fr)
DE (2) DE3732256A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202122A1 (de) * 1992-01-27 1993-07-29 Kloeckner Moeller Gmbh Ausloeseeinrichtung fuer schaltgeraete
US7091811B2 (en) * 2001-06-18 2006-08-15 Abb Ab Fixing member

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429722A (en) * 1940-07-13 1947-10-28 Westinghouse Electric Corp Circuit breaker
US3179767A (en) * 1956-06-21 1965-04-20 Wadsworth Electric Mfg Co Circuit breaker with improved electromagnetic tripping device
US3189707A (en) * 1962-04-03 1965-06-15 Fed Pacific Electric Co Coil form adapted for use in magnetictrip circuit breakers
USRE27891E (en) * 1971-07-13 1974-01-22 Davis inductor coil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429722A (en) * 1940-07-13 1947-10-28 Westinghouse Electric Corp Circuit breaker
US3179767A (en) * 1956-06-21 1965-04-20 Wadsworth Electric Mfg Co Circuit breaker with improved electromagnetic tripping device
US3189707A (en) * 1962-04-03 1965-06-15 Fed Pacific Electric Co Coil form adapted for use in magnetictrip circuit breakers
USRE27891E (en) * 1971-07-13 1974-01-22 Davis inductor coil

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4202122A1 (de) * 1992-01-27 1993-07-29 Kloeckner Moeller Gmbh Ausloeseeinrichtung fuer schaltgeraete
US7091811B2 (en) * 2001-06-18 2006-08-15 Abb Ab Fixing member

Also Published As

Publication number Publication date
DE3880604D1 (de) 1993-06-03
EP0309383B1 (fr) 1993-04-28
DE3732256A1 (de) 1989-04-06

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