EP0779634B1 - Current transformer and method for making same - Google Patents
Current transformer and method for making same 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
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- 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
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Classifications
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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
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- 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
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- 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)
Description
L'invention concerne un transformateur de courant comportant un circuit magnétique fermé en tôles empilées entourant un conducteur primaire, et un enroulement secondaire dont le noyau est une partie du circuit magnétique.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.
Les transformateurs de courant connus utilisés notamment dans des relais de déclenchement ou des disjoncteurs, fournissent de l'énergie électrique et des signaux de mesure de courant à des unités de traitement. De manière connue, les transformateurs comportent, un enroulement primaire constitué par un conducteur de puissance traversé par un fort courant, un circuit magnétique entourant le conducteur de puissance et un enroulement secondaire constitué par une ou deux bobines situées sur le circuit magnétique.Known current transformers used in particular in trip relays or circuit breakers, provide electrical power and current measurement signals to processing units. In known manner, 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.
Le circuit magnétique des transformateurs est constitué de tôles empilées. Pour permettre la mise en place des bobines de l'enroulement secondaire, les tôles ont de préférence des formes ouvertes. Les tôles sont introduites à l'intérieur des bobines puis fixées entre elles de manière à fermer le circuit magnétique.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.
La fixation de tôles empilées se fait par des soudures qui maintiennent des piles de tôles bout à bout. Avec ce mode de fixation le circuit magnétique risque de présenter des entrefers importants dus aux irrégularités des découpes des tôles et de l'empilage. Ces entrefers diminuent les performances du transformateur à bas courant.The fixing of stacked sheets is done by welds which hold stacks of sheets at the end. With this method of attachment, 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.
Le document DE 488 284 décrit un transformateur à tôles découpées et empilées de manière alternée permettant une diminution de la résistance magnétique du circuit magnétique. Cependant, une telle disposition ne permet pas de réduire les entrefers locaux.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.
Il existe des transformateurs de courant comportant un circuit magnétique constitué par des tôles fermées et empilées ne présentant pas d'entrefer. Dans ces transformateurs, l'enroulement secondaire doit être bobiné directement sur le circuit magnétique. Ce mode de fabrication élimine les risques de présence d'entrefer mais augmente considérablement la complexité, la durée de fabrication et le coût des transformateurs.There are current transformers comprising a magnetic circuit constituted by closed and stacked sheets with no air gap. In these transformers, 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.
L'invention a pour but un transformateur de courant ayant une réponse élevée à bas courant et d'une fabrication simple et rapide.The object of the invention is a current transformer having a high response at low current and simple and quick to manufacture.
Ce but est atteint par le fait que chaque tôle du circuit magnétique est constituée par une seule pièce entourant le conducteur primaire et comportant en un seul emplacement une découpe ayant des irrégularités complémentaires de manière à éviter des entrefers locaux, les tôles étant empilées dans une même position, la découpe de chaque tôle coïncidant avec les découpes des autres tôles. This goal is achieved by the fact that 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.
Dans un mode préférentiel de réalisation le circuit magnétique comporte une première partie fixe destinée à recevoir l'enroulement secondaire et une seconde partie flexible susceptible d'être momentanément déformée.In a preferred embodiment the magnetic circuit comprises a first part fixed for receiving the secondary winding and a second flexible part capable of to be momentarily distorted.
Le transformateur peut comporter des moyens de maintien pour maintenir les tôles dans le plan de leur découpe.The transformer may include holding means to keep the sheets in the plan of their cut.
Les découpes des tôles se situent de préférence dans une partie du circuit magnétique prolongeant le noyau de l'enroulement secondaire. Les tôles étant, par exemple, découpées perpendiculairement à l'axe de l'enroulement secondaire ou parallèlement à l'axe de l'enroulement secondaire.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.
Selon un mode particulier de réalisation le circuit magnétique est de forme rectangulaire et comporte un premier grand côté recevant l'enroulement secondaire, un second grand côté opposé au premier grand côté, et deux petits côtés, les découpes du circuit magnétique se situant entre le premier grand côté et un petit côté adjacent. La première partie fixe du circuit magnétique comporte le premier grand côté et la seconde partie flexible comporte au moins le grand côté opposé ou le petit côté adjacent. Dans ce mode de réalisation, les découpes sont de préférence effectuées selon une bissectrice d'un angle droit formé par le premier grand côté et un petit côté adjacent.According to a particular embodiment, 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. In this embodiment, the cutouts are preferably performed at a right angle bisector formed by the first long side and a small adjacent side.
Dans un procédé de fabrication d'un transformateur selon l'invention, 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 de chaque tôle, puis, dans une première étape une partie flexible des tôles du circuit magnétique est déformée, dans une seconde étape une bobine d'enroulement secondaire est disposée sur une partie fixe du circuit magnétique, et dans une troisième étape la partie flexible des tôles du circuit magnétique est remise en position normale, les parties fixe et flexible de chaque tôle étant alignées selon le plan de leur découpe.In a process for manufacturing a transformer according to the invention, 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.
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va
suivre, de modes particuliers de réalisation de l'invention, donnés à titre d'exemples non
limitatifs, et représentés aux dessins annexés sur lesquels :
Le transformateur connu de la figure 1 comporte un circuit magnétique 1 entourant un
conducteur primaire 2 de forte intensité et une bobine 3 formant un enroulement secondaire.
Le circuit magnétique est constitué par deux piles de tôles 4a et 4b indépendantes.The transformer known in FIG. 1 comprises a
Lors de la fabrication du transformateur, les piles de tôles 4a et 4b sont placées à l'intérieur
de la bobine, de manière à constituer des noyaux magnétiques.When manufacturing the transformer, the
Les tôles de la figure 1 ont des formes en L. Les deux piles 4a et 4b sont solidarisées en
position tête-bêche, après leur mise en place dans les bobines, par deux filets de soudure 5a
et 5b.The sheets in FIG. 1 have L-shaped shapes. The two
Aux jointures des piles de tôles, des irrégularités dues aux outils de découpes diminuent les performances du transformateur. La figure 2 montre un exemple d'irrégularités à la jointure des tôles. Ces irrégularités de découpes introduisent de petits entrefers locaux qui altèrent la réponse du transformateur à bas niveau de courant.At the joints of the sheet piles, irregularities due to the cutting tools reduce the transformer performance. 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.
Dans un transformateur selon l'invention, la réponse pour de faibles valeurs de courant est améliorée.In a transformer according to the invention, the response for low current values is improved.
La figure 3 montre un transformateur selon un premier mode de réalisation de l'invention.
Un circuit magnétique 4 ne comporte qu'une seule pile de tôles. Chaque tôle a une
découpe 7 permettant une déformation momentanée du circuit magnétique. Les tôles du
circuit magnétique sont empilées de manière à ce que les découpes coïncident selon un
même plan perpendiculaire à la surface desdites tôles.Figure 3 shows a transformer according to a first embodiment of the invention.
A
Le circuit magnétique 4 de la figure 3 a une forme rectangulaire comprenant deux grands
côtés 14a et 14c et deux petits côtés 14b et 14d. Le côté 14c du circuit magnétique reçoit
une bobine d'enroulement secondaire 3. La découpe est effectuée selon la bissectrice de
l'angle droit formé par le grand côté 14c et le petit côté 14d.The
Les irrégularités présentes de chaque côté des découpes sont complémentaires. Cette complémentarité compense les effets des irrégularités et ne perturbe plus la circulation du flux magnétique. L'apparition de petits entrefers locaux est ainsi évitée.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.
Une vue partielle d'une découpe en position écartée est représentée sur la figure 4. Sur cette
vue, une première irrégularité 8 de la découpe dépassant un axe médian 9 de découpe est
compensée par une seconde irrégularité 10, complémentaire à la première et située de
l'autre côté de la découpe en retrait de ce même axe médian.A partial view of a cut out position is shown in Figure 4. On this
view, a
Dans le mode de réalisation de la figure 3, le circuit magnétique 4 du transformateur de
courant comporte une première partie 11 constituant le noyau de la bobine secondaire 3 et
une seconde partie 12 susceptible d'être momentanément déformée.In the embodiment of FIG. 3, the
La première partie 11 comporte au moins le côté 14c recevant la bobine. La seconde
partie 12 comporte au moins le côté 14d adjacent au côté 14c et séparé par la découpe, ou le
grand côté 14a opposé au grand côté 14c.The
La mise en place de la bobine 3 de l'enroulement secondaire sur le circuit magnétique se
fait en trois étapes. Une première étape consiste à maintenir la première partie 11 du circuit
magnétique et à déformer momentanément la seconde partie 12. Ensuite (seconde étape),
pendant que la seconde partie est maintenue déformée, la première partie est introduite à
l'intérieur de la bobine de manière à constituer le noyau magnétique. Enfin, lors d'une
troisième étape, la seconde partie 12 est repositionnée dans sa position normale.The installation of the
La figure 5 montre un transformateur de courant au moment où les tôles de la partie 12 du
circuit magnétique sont déformées pour permettre la mise en place de la bobine 3 sur la
partie 11. Sur cette figure seul le grand côté 14a de la partie 12, opposé au grand côté 14c
de la partie fixe, est déformé. Figure 5 shows a current transformer when the sheets of
Sur les figures 6 et 7 les parties fixe et flexible respectivement 11 et 12 du circuit
magnétique sont maintenues par un dispositif de maintien 13. Le dispositif 13 maintient les
tôles serrées entre elles et alignées de part et d'autre de la découpe de manière à éviter les
risques d'entrefer.In Figures 6 and 7 the fixed and
Dans d'autres modes de réalisation le dispositif de maintien peut être intégré à un appareil recevant le transformateur de courant, par exemple un disjoncteur.In other embodiments the holding device can be integrated into a device receiving the current transformer, for example a circuit breaker.
Les figures 3 à 7 montrent des circuits magnétiques ayant des tôles découpées selon la bissectrice d'un angle droit entre deux côtés adjacents d'un circuit magnétique rectangulaire. Mais, il est possible de découper les tôles à d'autres emplacements, par exemple perpendiculairement à des côtés du circuit magnétique.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.
Les figures 8 et 9 montrent d'autres exemples possibles de découpes 7. La découpe de la
figure 8 se trouve sur le prolongement du grand côté 14c de la partie fixe recevant la
bobine 3, perpendiculairement au petit côté 14d adjacent au grand côté 14c, alors que la
découpe de la figure 9 est sur le grand côté 14c du circuit magnétique, perpendiculairement
à l'axe de la bobine 3.Figures 8 and 9 show other possible examples of
Les transformateurs décrits ci-dessus comportent une seule bobine 3, mais il est possible,
dans d'autres modes de réalisation de l'invention, de disposer plusieurs bobines
d'enroulement secondaire sur la partie du circuit magnétique constituant le noyau.The transformers described above have a
Dans les exemples cités ci-dessus, les circuits magnétiques sont rectangulaires, mais il est possible d'utiliser des circuits magnétiques de forme différente, notamment de forme carrée.In the examples cited above, the magnetic circuits are rectangular, but it is possible to use magnetic circuits of different shape, especially shape square.
La bobine de l'enroulement secondaire est de préférence située dans la partie la plus longue du circuit magnétique, mais elle pourrait tout aussi bien être disposée sur un petit côté d'un circuit magnétique rectangulaire.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.
Claims (10)
- A current transformer comprising a closed magnetic circuit (4) made up of stacked metal plates surrounding a primary conductor (2), and a secondary winding (3, 3a, 3b) whose core is a part of the magnetic circuit,
each plate of the magnetic circuit being formed by a single part surrounding the primary conductor and comprising a cut-out (7) at a single location, characterized in that the cut-out of each plate is achieved so as to produce complementary irregularities and to prevent local air-gaps, the plates being stacked in the same position, the cut-out (7) of each plate coinciding with the cut-outs of the other plates. - The current transformer according to claim 1 characterized in that the magnetic circuit (4) comprises a fixed first part (11) designed to receive the secondary winding (3) and a flexible second part (12) able to be momentarily deformed.
- The current transformer according to one of the claims 1 and 2 characterized in that the transformer comprises securing means (13) to hold the plates in the plane of their cut-out (7).
- The current transformer according to any one of the claims 1 to 3 characterized in that the magnetic circuit (4) is of rectangular shape and comprises a first large side (14c) receiving the secondary winding, a second large side (14a) opposite the first large side, and two small sides (14b, 14c), the cut-outs (7) of the magnetic circuit (4) being situated between the first large side (14c) and an adjacent small side (14d).
- The current transformer according to claim 4 characterized in that the fixed first part (11) of the magnetic circuit comprises the first large side (14c) and the flexible second part (12) comprises at least the opposite large side (14a) or the adjacent small side (14d).
- The current transformer according to any one of the claims 1 to 5 characterized in that the plate cut-outs (7) are situated in a part of the magnetic circuit prolonging the core of the secondary winding.
- The current transformer according to any one of the claims 1 to 6 characterized in that the plate cut-outs (7) are situated in a part (11, 14c) of the magnetic circuit prolonging the core of the secondary winding, the plates being cut perpendicularly to the axis of the secondary winding.
- The current transformer according to any one of the claims 1 to 6 characterized in that the plate cut-outs (7) are situated in a part of the magnetic circuit prolonging the core of the secondary winding, the plates being cut parallel to the axis of the secondary winding.
- The current transformer according to any one of the claims 4 to 6 characterized in that the cut-outs (7) of the magnetic circuit (4) are made according to a line bisecting a right angle formed by the first large side and an adjacent small side (14b, 14d).
- A manufacturing process of a current transformer comprising a closed magnetic circuit (4, 4a, 4b) formed by stacked metal plates, and a secondary winding (3),
wherein the metal plates are cut at a single place with cut-outs having complementary irregularities so as to prevent local air-gaps and stacked making the cut-outs (7) of each plate correspond, then in a first stage a flexible part (12) of the plates of the magnetic circuit is deformed, in a second stage a secondary winding coil (7) is arranged on a fixed part (11) of the magnetic circuit (4), and in a third stage the flexible part (12) of the plates of the magnetic circuit is put back in the normal position, the fixed part (11) and flexible part (12) of each plate being aligned according to the plane of their cut-out (7).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9515201 | 1995-12-14 | ||
FR9515201A FR2742573B1 (en) | 1995-12-14 | 1995-12-14 | CURRENT TRANSFORMER AND MANUFACTURING METHOD THEREOF |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0779634A1 EP0779634A1 (en) | 1997-06-18 |
EP0779634B1 true EP0779634B1 (en) | 2002-07-17 |
Family
ID=9485751
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960410114 Expired - Lifetime EP0779634B1 (en) | 1995-12-14 | 1996-11-20 | Current transformer and method for making same |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0779634B1 (en) |
DE (1) | DE69622359T2 (en) |
ES (1) | ES2179922T3 (en) |
FR (1) | FR2742573B1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009041033A1 (en) | 2009-09-14 | 2011-03-17 | Siemens Aktiengesellschaft | Closed magnet circuit for transformer of protective unit for electric circuit arrangement, particularly low voltage-circuit breaker, have section of loops for receiving windings of secondary conductor, which overlaps other loops |
Family Cites Families (5)
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---|---|---|---|---|
FR549682A (en) * | 1923-02-16 | |||
US1401493A (en) * | 1919-06-13 | 1921-12-27 | Remy Electric Co | Induction-coil |
DE488284C (en) * | 1928-04-08 | 1930-01-03 | Koch & Sterzel Akt Ges | Method for attaching a transformer core which is to be brought between two projections of an insulating body through which the primary conductor passes and which is to be placed around the insulating body |
YU48139B (en) * | 1990-01-25 | 1997-05-28 | Branimir Jakovljević | LAMINATED MAGNETIC core |
CH685892A5 (en) * | 1992-01-21 | 1995-10-31 | Lem S.A. | A method of mounting an electrical coil on a magnetic circuit with air gap |
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1995
- 1995-12-14 FR FR9515201A patent/FR2742573B1/en not_active Expired - Fee Related
-
1996
- 1996-11-20 DE DE1996622359 patent/DE69622359T2/en not_active Expired - Fee Related
- 1996-11-20 EP EP19960410114 patent/EP0779634B1/en not_active Expired - Lifetime
- 1996-11-20 ES ES96410114T patent/ES2179922T3/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009041033A1 (en) | 2009-09-14 | 2011-03-17 | Siemens Aktiengesellschaft | Closed magnet circuit for transformer of protective unit for electric circuit arrangement, particularly low voltage-circuit breaker, have section of loops for receiving windings of secondary conductor, which overlaps other loops |
Also Published As
Publication number | Publication date |
---|---|
ES2179922T3 (en) | 2003-02-01 |
DE69622359D1 (en) | 2002-08-22 |
DE69622359T2 (en) | 2003-04-03 |
EP0779634A1 (en) | 1997-06-18 |
FR2742573A1 (en) | 1997-06-20 |
FR2742573B1 (en) | 1998-02-06 |
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