EP0779634B1 - Stromwandler und Verfahren zu seiner Herstellung - Google Patents

Stromwandler und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0779634B1
EP0779634B1 EP19960410114 EP96410114A EP0779634B1 EP 0779634 B1 EP0779634 B1 EP 0779634B1 EP 19960410114 EP19960410114 EP 19960410114 EP 96410114 A EP96410114 A EP 96410114A EP 0779634 B1 EP0779634 B1 EP 0779634B1
Authority
EP
European Patent Office
Prior art keywords
magnetic circuit
cut
secondary winding
current transformer
plates
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
EP19960410114
Other languages
English (en)
French (fr)
Other versions
EP0779634A1 (de
Inventor
Pascal Houbre
Claude Rubbo
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.)
Schneider Electric Industries SAS
Original Assignee
Schneider Electric Industries SAS
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 Schneider Electric Industries SAS filed Critical Schneider Electric Industries SAS
Publication of EP0779634A1 publication Critical patent/EP0779634A1/de
Application granted granted Critical
Publication of EP0779634B1 publication Critical patent/EP0779634B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/20—Instruments transformers
    • H01F38/22—Instruments transformers for single phase ac
    • H01F38/28—Current transformers
    • H01F38/30—Constructions

Definitions

  • the invention relates to a current transformer comprising a closed magnetic circuit in stacked sheets surrounding a primary conductor, and a secondary winding whose core is part of the magnetic circuit.
  • transformers used in particular in trip relays or circuit breakers, provide electrical power and current measurement signals to processing units.
  • the transformers comprise, a winding primary consisting of a power conductor crossed by a strong current, a circuit magnetic surrounding the power conductor and a secondary winding constituted by one or two coils located on the magnetic circuit.
  • the magnetic circuit of the transformers consists of stacked sheets. To allow the placing the coils of the secondary winding, the sheets preferably have shapes open. The sheets are introduced inside the coils and then fixed together to close the magnetic circuit.
  • the fixing of stacked sheets is done by welds which hold stacks of sheets at the end.
  • the magnetic circuit may present air gaps important due to irregularities in sheet metal cutting and stacking. These air gaps decrease the performance of the low current transformer.
  • the document DE 488 284 describes a transformer with cut and stacked sheets alternating allowing a reduction in the magnetic resistance of the magnetic circuit. However, such an arrangement does not make it possible to reduce local air gaps.
  • transformers comprising a magnetic circuit constituted by closed and stacked sheets with no air gap.
  • the winding secondary must be wound directly on the magnetic circuit. This manufacturing method eliminates the risks of air gap presence but considerably increases the complexity, the manufacturing time and cost of transformers.
  • the object of the invention is a current transformer having a high response at low current and simple and quick to manufacture.
  • each sheet of the magnetic circuit is constituted by a single part surrounding the primary conductor and comprising in a single location a cutout with complementary irregularities so as to avoid local air gaps, the sheets being stacked in the same position, the cutting of each sheet coinciding with the cutting of the other sheets.
  • the magnetic circuit comprises a first part fixed for receiving the secondary winding and a second flexible part capable of to be momentarily distorted.
  • the transformer may include holding means to keep the sheets in the plan of their cut.
  • the sheet metal cuts are preferably located in a part of the magnetic circuit extending the core of the secondary winding.
  • the sheets being, for example, cut perpendicular to the axis of the secondary winding or parallel to the axis of the secondary winding.
  • the magnetic circuit is rectangular in shape and has a first large side receiving the secondary winding, a second large side opposite the first long side, and two short sides, the cutouts of the magnetic circuit located between the first large side and an adjacent small side.
  • the first fixed part of the circuit magnetic has the first long side and the second flexible part has at least the large opposite side or the small adjacent side.
  • the cutouts are preferably performed at a right angle bisector formed by the first long side and a small adjacent side.
  • the sheets are cut in one place with cutouts having complementary irregularities so as to avoid local air gaps and stacked by matching the cuts of each sheet, then, in a first step, a flexible part of the sheets of the magnetic circuit is deformed, in a second step a secondary winding coil is placed on a fixed part of the magnetic circuit, and in a third step the part flexible of the magnetic circuit sheets is returned to normal position, the fixed parts and flexible of each sheet being aligned according to the plane of their cutting.
  • the transformer known in FIG. 1 comprises a magnetic circuit 1 surrounding a high intensity primary conductor 2 and a coil 3 forming a secondary winding.
  • the magnetic circuit consists of two stacks of independent sheets 4a and 4b.
  • the sheet piles 4a and 4b are placed inside of the coil, so as to constitute magnetic cores.
  • the sheets in FIG. 1 have L-shaped shapes.
  • the two piles 4a and 4b are joined together in head to tail position, after their installation in the coils, by two welding threads 5a and 5b.
  • Figure 2 shows an example of irregularities in the join sheets. These irregularities in cuts introduce small local air gaps which alter the transformer response at low current level.
  • FIG. 3 shows a transformer according to a first embodiment of the invention.
  • a magnetic circuit 4 has only one stack of sheets. Each sheet has a cutout 7 allowing momentary deformation of the magnetic circuit. The sheets of magnetic circuit are stacked so that the cutouts coincide in a same plane perpendicular to the surface of said sheets.
  • the magnetic circuit 4 of Figure 3 has a rectangular shape comprising two large sides 14a and 14c and two short sides 14b and 14d.
  • the 14c side of the magnetic circuit receives a secondary winding coil 3.
  • the cutting is carried out according to the bisector of the right angle formed by the long side 14c and the short side 14d.
  • the irregularities present on each side of the cuts are complementary. This complementarity compensates for the effects of irregularities and no longer disrupts the circulation of magnetic flux. The appearance of small local air gaps is thus avoided.
  • FIG. 4 A partial view of a cut out position is shown in Figure 4. On this view, a first irregularity 8 of the cut beyond a median axis 9 of cut is compensated by a second irregularity 10, complementary to the first and located the other side of the cut back from this same median axis.
  • the magnetic circuit 4 of the transformer current comprises a first part 11 constituting the core of the secondary coil 3 and a second part 12 capable of being temporarily deformed.
  • the first part 11 has at least the side 14c receiving the coil.
  • the second part 12 comprises at least the side 14d adjacent to the side 14c and separated by the cutout, or the long side 14a opposite to long side 14c.
  • a first step is to maintain the first part 11 of the circuit magnetic and momentarily deform the second part 12.
  • second step while the second part is kept deformed, the first part is introduced at inside the coil so as to constitute the magnetic core.
  • the second part 12 is repositioned in its normal position.
  • Figure 5 shows a current transformer when the sheets of part 12 of the magnetic circuit are deformed to allow the establishment of the coil 3 on the part 11.
  • the long side 14a of part 12 opposite the long side 14c of the fixed part, is deformed.
  • Figures 6 and 7 the fixed and flexible parts 11 and 12 respectively of the circuit magnetic are held by a holding device 13.
  • the device 13 holds the sheets clamped together and aligned on either side of the cutout so as to avoid air gap risks.
  • the holding device can be integrated into a device receiving the current transformer, for example a circuit breaker.
  • Figures 3 to 7 show magnetic circuits having sheets cut according to the bisector of a right angle between two adjacent sides of a magnetic circuit rectangular. However, it is possible to cut the sheets at other locations, for example example perpendicular to sides of the magnetic circuit.
  • Figures 8 and 9 show other possible examples of cutouts 7. Cutting the Figure 8 is on the extension of the long side 14c of the fixed part receiving the coil 3, perpendicular to the short side 14d adjacent to the long side 14c, while the cutout in Figure 9 is on the long side 14c of the magnetic circuit, perpendicularly to the axis of the coil 3.
  • the transformers described above have a single coil 3, but it is possible, in other embodiments of the invention, to have several coils secondary winding on the part of the magnetic circuit constituting the core.
  • the magnetic circuits are rectangular, but it is possible to use magnetic circuits of different shape, especially shape square.
  • the coil of the secondary winding is preferably located in the longest part of the magnetic circuit, but it could just as easily be placed on a small side of a rectangular magnetic circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (10)

  1. Stromwandler mit einem geschlossenen Magnetkreis (4) aus um einen Primärleiter (2) geführten aufeinandergestapelten Blechen sowie einer Sekundärwicklung (3, 3a, 3b) mit einem als Teil des Magnetkreises ausgebildeten Kern, wobei jedes Blech des Magnetkreises als um den Primärleiter geführtes einstückiges Teil ausgeführt ist und nur an einer Stelle eine Schnittfuge (7) aufweist, dadurch gekennzeichnet, daß die Schnittfuge jedes Bleches so ausgeführt ist, daß zueinander komplementäre Unebenheiten entstehen und die Ausbildung von örtlichen Luftspalten verhindert wird, wobei die Bleche mit gleicher Ausrichtung aufeinandergestapelt sind und die Schnittfuge (7) jedes einzelnen Blechs mit den Schnittfugen der übrigen Bleche fluchtet.
  2. Stromwandler nach Anspruch 1, dadurch gekennzeichnet, daß der Magnetkreis (4) einen ersten feststehenden Abschnitt (11) zur Aufnahme der Sekundärwicklung (3) sowie einen zweiten biegsamen Abschnitt (12) umfaßt, der vorübergehend verformt werden kann.
  3. Stromwandler nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der Stromwandler Haltemittel (13) zur Fixierung der Bleche in der Ebene ihrer Schnittfuge (7) umfaßt.
  4. Stromwandler nach irgendeinem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Magnetkreis (4) eine rechteckige Form aufweist und einen ersten langen Schenkel (14c) zur Aufnahme der Sekundärwicklung, einen dem ersten langen Schenkel gegenüberliegenden zweiten langen Schenkel (14a) sowie zwei kurze Schenkel (14b, 14c) umfaßt, wobei die Schnittfugen (7) des Magnetkreises (4) zwischen dem ersten langen Schenkel (14c) und einem angrenzenden kurzen Schenkel (14d) ausgebildet sind.
  5. Stromwandler nach Anspruch 4, dadurch gekennzeichnet, daß der erste feststehende Abschnitt (11) des Magnetkreises den ersten langen Schenkel (14c), und der zweite biegsame Abschnitt (12) mindestens den gegenüberliegenden langen Schenkel (14a) oder den angrenzenden kurzen Schenkel (14d) umfaßt.
  6. Stromwandler nach irgendeinem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Schnittfugen (7) der Bleche in einem, in der Verlängerung des Kerns der Sekundärwicklung angeordneten Bereich des Magnetkreises ausgebildet sind.
  7. Stromwandler nach irgendeinem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Schnittfugen (7) der Bleche in einem, in der Verlängerung des Kerns der Sekundärwicklung angeordneten Bereich des Magnetkreises ausgebildet sind und senkrecht zur Längsachse der Sekundärwicklung verlaufen.
  8. Stromwandler nach irgendeinem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Schnittfugen (7) der Bleche in einem, in der Verlängerung des Kerns der Sekundärwicklung angeordneten Bereich des Magnetkreises ausgebildet sind und parallel zur Längsachse der Sekundärwicklung verlaufen.
  9. Stromwandler nach irgendeinem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß die Schnittfugen (7) des Magnetkreises (4) längs der Winkelhalbierenden eines durch den ersten langen Schenkel und einen angrenzenden kurzen Schenkel (14b, 14d) gebildeten rechten Winkels ausgeführt sind.
  10. Verfahren zur Herstellung eines Stromwandlers mit einem geschlossenen Magnetkreis (4, 4a, 4b) aus aufeinandergestapelten Blechen sowie einer Sekundärwicklung (3), bei dem die Bleche an einer einzigen Stelle unter Ausbildung einer Schnittfuge mit komplementären Unebenheiten aufgeschnitten werden, so daß die Entstehung örtlicher Luftspalte verhindert wird, und die Bleche so aufeinandergestapelt werden, daß die Schnittfugen (7) aller Bleche übereinander liegen, und bei dem anschließend in einem ersten Schritt ein biegsamer Abschnitt (12) der Bleche des Magnetkreises verformt, in einem zweiten Schritt eine Sekundärwicklungsspule (7) auf einem feststehenden Abschnitt (11) des Magnetkreises aufgebracht und in einem dritten Schritt der biegsame Abschnitt (12) der Bleche des Magnetkreises in seine Normalstellung zurückgeführt werden, wobei der feststehende Abschnitt (11) und der biegsame Abschnitt (12) jedes Blechs in der Ebene ihrer Schnittfuge (7) miteinander fluchten.
EP19960410114 1995-12-14 1996-11-20 Stromwandler und Verfahren zu seiner Herstellung Expired - Lifetime EP0779634B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9515201A FR2742573B1 (fr) 1995-12-14 1995-12-14 Transformateur de courant et son procede de fabrication
FR9515201 1995-12-14

Publications (2)

Publication Number Publication Date
EP0779634A1 EP0779634A1 (de) 1997-06-18
EP0779634B1 true EP0779634B1 (de) 2002-07-17

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EP19960410114 Expired - Lifetime EP0779634B1 (de) 1995-12-14 1996-11-20 Stromwandler und Verfahren zu seiner Herstellung

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EP (1) EP0779634B1 (de)
DE (1) DE69622359T2 (de)
ES (1) ES2179922T3 (de)
FR (1) FR2742573B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041033A1 (de) 2009-09-14 2011-03-17 Siemens Aktiengesellschaft Geschlossener Magnetkreis für einen Wandler

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR549682A (de) * 1923-02-16
US1401493A (en) * 1919-06-13 1921-12-27 Remy Electric Co Induction-coil
DE488284C (de) * 1928-04-08 1930-01-03 Koch & Sterzel Akt Ges Verfahren zum Anbringen eines Transformatorenkernes, der zwischen zwei Vorspruenge eines vom Primaerleiter durchzogenen Isolierkoerpers gebracht und um den Isolierkoerper herumgelegt werden soll
YU48139B (sh) * 1990-01-25 1997-05-28 Branimir Jakovljević Laminirana magnetna jezgra
CH685892A5 (fr) * 1992-01-21 1995-10-31 Lem S.A. Procédé de montage d'une bobine électrique sur un circuit magnétique à entrefer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041033A1 (de) 2009-09-14 2011-03-17 Siemens Aktiengesellschaft Geschlossener Magnetkreis für einen Wandler

Also Published As

Publication number Publication date
FR2742573A1 (fr) 1997-06-20
FR2742573B1 (fr) 1998-02-06
EP0779634A1 (de) 1997-06-18
DE69622359D1 (de) 2002-08-22
DE69622359T2 (de) 2003-04-03
ES2179922T3 (es) 2003-02-01

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