EP0779634B1 - Transformateur de courant et son procédé de fabrication - Google Patents
Transformateur de courant et son procédé de fabrication Download PDFInfo
- 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
Links
Images
Classifications
-
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Transformers For Measuring Instruments (AREA)
- Coils Or Transformers For Communication (AREA)
Description
Claims (10)
- Transformateur de courant comportant un circuit magnétique fermé (4) en tôles empilées entourant un conducteur (2) primaire, et un enroulement (3, 3a, 3b) secondaire dont le noyau est une partie du circuit magnétique,
chaque tôle du circuit magnétique étant constituée par une seule pièce entourant le conducteur primaire et comportant en un seul emplacement une découpe (7), caractérisé en ce que la découpe de chaque tôle est réalisée de manière à produire des irrégularités complémentaires et éviter des entrefers locaux, les tôles étant empilées dans une même position, la découpe (7) de chaque tôle coïncidant avec les découpes des autres tôles. - Transformateur de courant selon la revendication 1 caractérisé en ce que le circuit magnétique (4) comporte une première partie (11) fixe destinée à recevoir l'enroulement (3) secondaire et une seconde partie (12) flexible susceptible d'être momentanément déformée.
- Transformateur de courant selon l'une des revendications 1 et 2 caractérisé en ce que le transformateur comporte des moyens (13) de maintien pour maintenir les tôles dans le plan de leur découpe (7).
- Transformateur de courant selon l'une quelconque des revendications 1 à 3 caractérisé en ce que le circuit magnétique (4) est de forme rectangulaire et comporte un premier grand côté (14c) recevant l'enroulement secondaire, un second grand côté (14a) opposé au premier grand côté, et deux petits côtés (14b, 14c), les découpes (7) du circuit magnétique (4) se situant entre le premier grand côté (14c) et un petit côté adjacent (14d).
- Transformateur de courant selon la revendication 4 caractérisé en ce que la première partie (11) fixe du circuit magnétique comporte le premier grand côté (14c) et la seconde partie (12) flexible comporte au moins le grand côté opposé (14d) ou le petit côté adjacent (14d).
- Transformateur de courant selon l'une quelconque des revendications 1 à 5 caractérisé en ce que les découpes (7) des tôles se situent dans une partie du circuit magnétique prolongeant le noyau de l'enroulement secondaire.
- Transformateur de courant selon l'une quelconque des revendications 1 à 6 caractérisé en ce que les découpes (7) des tôles se situent dans une partie (11, 14c) du circuit magnétique prolongeant le noyau de l'enroulement secondaire, les tôles étant découpées perpendiculairement à l'axe de l'enroulement secondaire.
- Transformateur de courant selon l'une quelconque des revendications 1 à 6 caractérisé en ce que les découpes (7) des tôles se situent dans une partie du circuit magnétique prolongeant le noyau de l'enroulement secondaire, les tôles étant découpées parallèlement à l'axe de l'enroulement secondaire.
- Transformateur de courant selon quelconque des revendications 4 à 6 caractérisé en ce que les découpes (7) du circuit magnétique (4) sont effectuées selon une bissectrice d'un angle droit formé par le premier grand côté et un petit côté adjacent (14b, 14d).
- Procédé de fabrication d'un transformateur de courant comportant un circuit magnétique fermé (4, 4a, 4b) constitué par des tôles empilées, et un enroulement secondaire (3), dans lequel les tôles sont découpées en un seul endroit avec des découpes ayant des irrégularités complémentaires de manière à éviter des entrefers locaux et empilées en faisant correspondre les découpes (7) de chaque tôle, puis, dans une première étape une partie flexible (12) des tôles du circuit magnétique est déformée, dans une seconde étape une bobine (7) d'enroulement secondaire est disposée sur une partie (11) fixe du circuit magnétique (4), et dans une troisième étape la partie (12) flexible des tôles du circuit magnétique est remise en position normale, les parties fixe (11) et flexible (12) de chaque tôle étant alignées selon le plan de leur découpe (7).
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 (fr) | 1997-06-18 |
EP0779634B1 true EP0779634B1 (fr) | 2002-07-17 |
Family
ID=9485751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960410114 Expired - Lifetime EP0779634B1 (fr) | 1995-12-14 | 1996-11-20 | Transformateur de courant et son procédé de fabrication |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0779634B1 (fr) |
DE (1) | DE69622359T2 (fr) |
ES (1) | ES2179922T3 (fr) |
FR (1) | FR2742573B1 (fr) |
Cited By (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR549682A (fr) * | 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 |
EP0439410A3 (en) * | 1990-01-25 | 1992-01-29 | Branimir Jakovljevic | Laminate for magnetic core |
CH685892A5 (fr) * | 1992-01-21 | 1995-10-31 | Lem S.A. | Procédé de montage d'une bobine électrique sur un circuit magnétique à entrefer |
-
1995
- 1995-12-14 FR FR9515201A patent/FR2742573B1/fr not_active Expired - Fee Related
-
1996
- 1996-11-20 EP EP19960410114 patent/EP0779634B1/fr not_active Expired - Lifetime
- 1996-11-20 ES ES96410114T patent/ES2179922T3/es not_active Expired - Lifetime
- 1996-11-20 DE DE1996622359 patent/DE69622359T2/de not_active Expired - Fee Related
Cited By (1)
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 |
ES2179922T3 (es) | 2003-02-01 |
DE69622359D1 (de) | 2002-08-22 |
DE69622359T2 (de) | 2003-04-03 |
EP0779634A1 (fr) | 1997-06-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
OA13204A (fr) | Dispositif de mesure d'un courant électrique, capteur de courant, déclencheur électrique et dispositif de coupure comportant un tel dispositif de mesure. | |
EP0523588A1 (fr) | Bobinage de transformateur constitué d'un ruban isolant comportant des motifs électriquement conducteurs permettant de réaliser une mise en parallèle des motifs lors du pliage en accordéon de ce ruban | |
WO2022022896A1 (fr) | Composant magnetique à flux de fuite controlé | |
FR2739225A1 (fr) | Element d'antenne a hyperfrequences | |
FR2476898A1 (fr) | Bobinage electromagnetique comportant des elements discrets et dispositif d'alimentation electrique comportant de tels bobinages | |
EP0779634B1 (fr) | Transformateur de courant et son procédé de fabrication | |
EP0017530A1 (fr) | Source rayonnante constituée par un dipole excité par un guide d'onde extra-plat, et son utilisation dans une antenne à balayage électronique | |
WO1992011683A1 (fr) | Appareil muni d'un moteur electrique d'entrainement | |
EP3229247A1 (fr) | Composant magnétique, circuit electrique resonant, convertisseur electrique et systeme electrique | |
EP3072372B1 (fr) | Carte électronique comprenant des éléments magnétiques | |
US6335673B1 (en) | Current transformer and its manufacturing process | |
JP2001160513A (ja) | アモルファス巻鉄心変圧器 | |
EP0727794B1 (fr) | Transformateur, notamment pour convertisseur d'énergie, et convertisseur d'énergie à résonance doté d'une tel transformateur | |
FR2703506A1 (fr) | Disjoncteur comportant un dispositif de raccordement de déclencheurs. | |
EP3198617A1 (fr) | Noyau magnetique de transformateur tournant | |
EP3671776A1 (fr) | Ensemble inductif | |
EP0043523A1 (fr) | Bobine électrique d'inductance shunt pour ligne de transport d'énergie électrique et procédé de réalisation d'une telle bobine | |
WO2017140674A1 (fr) | Composant magnétique, circuit electrique resonant, convertisseur electrique et systeme electrique | |
JP2003077735A (ja) | アモルファス鉄心変圧器 | |
WO2021116632A1 (fr) | Dispositif électrotechnique pour un aéronef | |
BE900164A (fr) | Machine electrique transformatrice de tension, pouvant etre commandee. | |
EP0365407B1 (fr) | Transformateur de puissance à échauffement réduit | |
EP1603196A1 (fr) | Transformateur à bornes simplifiées | |
FR2565399A1 (fr) | Transformateur a fort couplage primaire-secondaire | |
FR3129244A1 (fr) | Transformateur planaire et convertisseur electrique bidirectionnel dc-dc comportant un tel transformateur planaire |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE ES GB IT |
|
17P | Request for examination filed |
Effective date: 19980219 |
|
17Q | First examination report despatched |
Effective date: 19990518 |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHNEIDER ELECTRIC INDUSTRIES SA |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SCHNEIDER ELECTRIC INDUSTRIES SA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE ES GB IT |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REF | Corresponds to: |
Ref document number: 69622359 Country of ref document: DE Date of ref document: 20020822 |
|
RAP2 | Party data changed (patent owner data changed or rights of a patent transferred) |
Owner name: SCHNEIDER ELECTRIC INDUSTRIES SAS |
|
GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 20020916 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20021029 Year of fee payment: 7 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2179922 Country of ref document: ES Kind code of ref document: T3 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20030422 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20040602 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20131120 Year of fee payment: 18 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20131111 Year of fee payment: 18 Ref country code: ES Payment date: 20131011 Year of fee payment: 18 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20141120 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141120 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20151229 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141120 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20141121 |