EP0509936B1 - Homopolar transformer with magnetic circuit insensitive to mechanical stresses, and manufacturing method - Google Patents
Homopolar transformer with magnetic circuit insensitive to mechanical stresses, and manufacturing method Download PDFInfo
- Publication number
- EP0509936B1 EP0509936B1 EP92420074A EP92420074A EP0509936B1 EP 0509936 B1 EP0509936 B1 EP 0509936B1 EP 92420074 A EP92420074 A EP 92420074A EP 92420074 A EP92420074 A EP 92420074A EP 0509936 B1 EP0509936 B1 EP 0509936B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic circuit
- shells
- base
- enclosure
- homopolar
- 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
- 230000005291 magnetic effect Effects 0.000 title claims description 30
- 238000004519 manufacturing process Methods 0.000 title description 2
- 239000003292 glue Substances 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 6
- 230000035939 shock Effects 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 3
- 229920001296 polysiloxane Polymers 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000005294 ferromagnetic effect Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
- H01H83/14—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection
- H01H83/144—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by imbalance of two or more currents or voltages, e.g. for differential protection with differential transformer
-
- 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
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/266—Fastening or mounting the core on casing or support
-
- 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
- H01F2038/305—Constructions with toroidal magnetic core
Definitions
- the invention relates to a zero sequence transformer, in particular for a differential switch or circuit breaker, comprising a cylindrical magnetic circuit formed by the winding of a ferromagnetic strip having a high magnetic permeability, in particular an iron-nickel alloy and an envelope made of molded insulating material, constituted by the assembly of two conjugate half-shells delimiting an annular internal space for housing the magnetic circuit, one of the front faces of the cylindrical magnetic circuit being secured to the bottom of one of the half-shells by bonding means, the other faces of the magnetic circuit are separated from the envelope by functional clearances
- the toroids used as totalizing current transformers in differential protection devices generally use alloys based on iron-nickel having very high magnetic permeabilities, in particular between 50,000 and 500,000. These materials are very sensitive to lateral mechanical stresses which can arise from a variation in pressure, shock or vibration. The effect can result in a decrease in the permeability of the material constituting the magnetic circuit, with a corresponding rise in the differential triggering threshold, to the detriment of the sensitivity of the differential protection device.
- the opposite end faces of the cylindrical magnetic circuit 10 are protected by means of a pair of annular washers 12, 14 made of polyurethane foam.
- These washers 12,14 are in abutment against the bottom of each half-shell 16,18 of the insulating casing 20, and are shaped as dampers between the magnetic circuit 10 and the casing 20.
- the damping effect of washers 12,14 is exerted in the axial direction, and the casing 20 has a transverse functional clearance 21 arranged to prevent any transmission of mechanical stresses in the radial direction.
- the positioning of the foam washers 12, 14 inside the half-shells 16, 18 is carried out manually before the insertion of the magnetic circuit 10.
- An adhesive strip 22 is then bonded to the external interface of the half-shells. shells 16,18 butted together to close the envelope 20.
- the mounting of such a zero sequence transformer is possible by manual. Automation of the assembly would require automatic distribution and positioning operations, which are difficult to achieve with the use of foam washers.
- Document JP-A-3,019,307 describes a homopolar transformer with wound magnetic toroid fixed on the bottom of the envelope by means of a gel based on silicone rubber.
- the gel overflows on the lateral sides of the torus, and after polymerization risks transmitting lateral mechanical stresses which affect the stability of the permeability of the ferromagnetic material.
- Document JP-A-2,039,403 relates to the fixing of a magnetic core between two half-shells after interposition of an adhesive material on the opposite upper and lower faces.
- the object of the invention consists in making a zero sequence transformer insensitive to mechanical stresses, and in manufacturing said transformer with an automatic mounting process.
- the zero sequence transformer according to the invention is characterized in that the bonding means consist of three drops of glue arranged at 120 degrees on the annular bottom of the half-shell, so as to form an elastic suspension connection preventing any propagation of external shocks towards the magnetic circuit.
- the elastic suspension of the magnetic circuit inside the internal space frees it from any mechanical stress due to shocks or vibrations from outside.
- the permeability of the ferromagnetic material then remains invariable.
- Figure 1 is a schematic sectional view of a zero sequence transformer according to the prior art, the primary and secondary windings not being shown.
- Figure 2 is an identical view to Figure 1 of a transformer according to the invention.
- the magnetic circuit 10 with a wound strip of iron-nickel alloy is secured by one 24 of its front faces on the bottom 26 inside the half-shell 18.
- the fixing of the magnetic circuit 10 is made by gluing with three drops 28 of silicone glue deposited at 120 degrees on the annular base 26, prior to the installation of the magnetic circuit 10.
- the upper front face 30 of the magnetic circuit 10 is separated from the bottom 32 of the half-shell 16 by an axial functional clearance 34.
- the three drops 28 of silicone adhesive on the bottom 26 ensure an elastic suspension without constraint of the magnetic circuit 10 inside the annular internal space 36 of the envelope 20.
- the assembly ends of the half-shells 16,18 comprise latching means 38 male and female, avoiding the use of adhesive tape at the end of the mounting of the zero sequence transformer.
- silicone glue can be replaced by any other equivalent elastic fixing means.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Coils Or Transformers For Communication (AREA)
- Transformers For Measuring Instruments (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Description
L'invention est relative à un transformateur homopolaire, notamment pour un interrupteur ou un disjoncteur différentiel, comprenant un circuit magnétique cylindrique formé par l'enroulement d'une bande ferromagnétique présentant une perméabilité magnétique élevée, notamment un alliage fer-nickel et une enveloppe en matériau isolant moulé, constituée par l'assemblage de deux demi-coquilles conjuguées délimitant un espace interne annulaire de logement du circuit magnétique, l'une des faces frontales du circuit magnétique cylindrique étant solidarisée au fond de l'une des demi-coquilles par des moyens de collage, les autres faces du circuit magnétique sont séparées de l'enveloppe par des jeux fonctionnelsThe invention relates to a zero sequence transformer, in particular for a differential switch or circuit breaker, comprising a cylindrical magnetic circuit formed by the winding of a ferromagnetic strip having a high magnetic permeability, in particular an iron-nickel alloy and an envelope made of molded insulating material, constituted by the assembly of two conjugate half-shells delimiting an annular internal space for housing the magnetic circuit, one of the front faces of the cylindrical magnetic circuit being secured to the bottom of one of the half-shells by bonding means, the other faces of the magnetic circuit are separated from the envelope by functional clearances
Les tores utilisés comme transformateurs totalisateurs de courants dans les dispositifs de protection différentielle utilisent généralement des alliages à base de fer-nickel présentant des perméabilités magnétiques très élevées, notamment entre 50.000 et 500.000. Ces matériaux sont très sensibles aux contraintes mécaniques latérales qui peuvent prendre naissance à l'occasion d'une variation de pression, de chocs ou de vibrations. L'effet peut se traduire par une diminution de la perméabilité du matériau constitutif du circuit magnétique, avec une élévation correspondante du seuil de déclenchement différentiel, au détriment de la sensibilité du dispositif de protection différentielle.The toroids used as totalizing current transformers in differential protection devices generally use alloys based on iron-nickel having very high magnetic permeabilities, in particular between 50,000 and 500,000. These materials are very sensitive to lateral mechanical stresses which can arise from a variation in pressure, shock or vibration. The effect can result in a decrease in the permeability of the material constituting the magnetic circuit, with a corresponding rise in the differential triggering threshold, to the detriment of the sensitivity of the differential protection device.
Selon un dispositif connu illustré à la figure 1, les faces frontales opposées du circuit magnétique 10 cylindrique sont protégées au moyen d'une paire de rondelles 12,14 annulaires en mousse de polyuréthane. Ces rondelles 12,14 se trouvent en appui contre le fond de chaque demi-coquille 16,18 de l'enveloppe 20 isolante, et sont conformées en amortisseurs entre le circuit magnétique 10 et l'enveloppe 20. L'effet d'amortissement des rondelles 12,14 s'exerce dans le sens axial, et l'enveloppe 20 présente un jeu fonctionnel 21 transversal agencé pour interdire toute transmission de contraintes mécaniques dans le sens radial.According to a known device illustrated in FIG. 1, the opposite end faces of the cylindrical
La mise en place des rondelles 12,14 de mousse à l'intérieur des demi-coquilles 16,18 s'effectue manuellement avant l'insertion du circuit magnétique 10. Une bande 22 adhésive est ensuite collée sur l'interface extérieure des demi- coquilles 16,18 aboutées pour fermer l'enveloppe 20. Le montage d'un tel transformateur homopolaire est possible en manuel. L'automatisation du montage nécessiterait des opérations automatiques de distribution et de position nement, qui sont difficilement réalisables avec l'emploi de rondelles de mousse.The positioning of the
Le document JP-A-3.019.307 décrit un transformateur homopolaire à tore magnétique enroulé fixé sur le fond de l'enveloppe au moyen d'un gel à base de caoutchouc au silicone. Le gel déborde sur les côtés latéraux du tore, et risque après polymérisation de transmettre des contraintes mécaniques latérales qui nuisent à la stabilité de la perméabilité du matériau ferromagnétique.Document JP-A-3,019,307 describes a homopolar transformer with wound magnetic toroid fixed on the bottom of the envelope by means of a gel based on silicone rubber. The gel overflows on the lateral sides of the torus, and after polymerization risks transmitting lateral mechanical stresses which affect the stability of the permeability of the ferromagnetic material.
Le document JP-A-2.039.403 se rapporte à la fixation d'un noyau magnétique entre deux demi-coquilles après interposition d'un matériau adhésif sur les faces opposées supérieure et inférieure.Document JP-A-2,039,403 relates to the fixing of a magnetic core between two half-shells after interposition of an adhesive material on the opposite upper and lower faces.
L'objet de l'invention consiste à réaliser un transformateur homopolaire insensible à des contraintes mécaniques, et à fabriquer ledit transformateur avec un procédé de montage automatique.The object of the invention consists in making a zero sequence transformer insensitive to mechanical stresses, and in manufacturing said transformer with an automatic mounting process.
Le transformateur homopolaire selon l'invention est caractérisé en ce que les moyens de collage sont constitués par trois gouttes de colle disposées à 120 degrés sur le fond annulaire de la demi-coquille, de manière à former une liaison à suspension élastique évitant toute propagation de chocs extérieurs vers le circuit magnétique .The zero sequence transformer according to the invention is characterized in that the bonding means consist of three drops of glue arranged at 120 degrees on the annular bottom of the half-shell, so as to form an elastic suspension connection preventing any propagation of external shocks towards the magnetic circuit.
La suspension élastique du circuit magnétique à l'intérieur de l'espace interne le libère de toute contrainte mécanique due à des chocs ou vibrations en provenance de l'extérieur. La perméabilité du matériau ferromagnétique reste alors invariable.The elastic suspension of the magnetic circuit inside the internal space frees it from any mechanical stress due to shocks or vibrations from outside. The permeability of the ferromagnetic material then remains invariable.
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un exemple de réalisation de l'invention, représenté au dessin annexé, dans lequel:Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention, represented in the appended drawing, in which:
La figure 1 est une vue shématique en coupe d'un transformateur homopolaire selon l'art antérieur, les enroulements primaire et secondaire n'étant pas représentés.Figure 1 is a schematic sectional view of a zero sequence transformer according to the prior art, the primary and secondary windings not being shown.
La figure 2 est une vue identique de la figure 1, d'un transformateur selon l'invention.Figure 2 is an identical view to Figure 1 of a transformer according to the invention.
Sur la figure 2, le circuit magnétique 10 à bande enroulée en alliage fer-nickel est solidarisé par l'une 24 de ses faces frontales sur le fond 26 à l'intérieur de la demi- coquille 18. La fixation du circuit magnétique 10 est effectuée par collage grâce à trois gouttes 28 de colle silicone déposées à 120 degrés sur le fond 26 annulaire, préalablement à la mise en place du circuit magnétique 10.In FIG. 2, the
En plus des jeux fonctionnels 21 radiaux, la face frontale supérieure 30 du circuit magnétique 10 est séparée du fond 32 de la demi-coquille 16 par un jeu fonctionnel 34 axial.In addition to the radial
Après séchage, les trois goutttes 28 de colle silicone sur le fond 26 assurent une suspension élastique sans contrainte du circuit magnétique 10 à l'intérieur de l'espace 36 interne annulaire de l'enveloppe 20.After drying, the three
La présence des jeux 21,34 par rapport aux autres faces de l'espace 36 évite toute propagation de chocs extérieurs vers le circuit magnétique 10.The presence of the
Les extrémités d'assemblage des demi-coquilles 16,18 comportent des moyens d'encliquetage 38 mâle et femelle,évitant l'usage de bande adhésive à la fin du montage du transformateur homopolaire.The assembly ends of the half-
Les opérations de dépôt des gouttes de colle 28, de mise en place du circuit magnétique 10 dans la demi-coquille 18, et d'encliquetage des deux demi-coquilles 16,18 peuvent être facilement effectuées en automatique.The operations for depositing the drops of
Il est clair que la colle silicone peut être remplacée par tout autre moyen de fixation élastique équivalent.It is clear that the silicone glue can be replaced by any other equivalent elastic fixing means.
Claims (3)
- A homopolar transformer, notably for a differential switch or circuit breaker, comprising a cylindrical magnetic circuit (10) formed by winding of a ferromagnetic strip presenting a high magnetic permeability, notably made of iron-nickel alloy and an enclosure (20) made of moulded insulating material, formed by assembly of two conjugate half-shells (16, 18) bounding an annular internal space (36) for housing the magnetic circuit (10), one of the front faces (24) of the cylindrical magnetic circuit (10) being securedly united to the base (26) of one (18) of the half-shells by sticking means (28), the other faces of the magnetic circuit (10) being separated from the enclosure (20) by functional clearances (21, 34), characterized in that the sticking means (28) are constituted by three drops of glue deposited at 120 degrees on the annular base (26) of the half-shell (18), so as to form an elastic suspension bond preventing any propagation of external shocks to the magnetic circuit (10).
- The homopolar transformer according to claim 1, characterized in that the sticking means (28) are achieved using a silicone base glue, depositable on the base (26) of the half-shell (18) before the magnetic circuit (10) is fitted.
- The homopolar transformer according to claim 1 or 2, characterized in that the assembly ends of the two half-shells (16, 18) comprise male and female clipping means (38), and that the enclosure (20) is closable by clipping of the two half-shells (16, 18) after insertion of the magnetic circuit (10) stuck laterally onto the base (26).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9103831 | 1991-03-27 | ||
| FR9103831A FR2674674B1 (en) | 1991-03-27 | 1991-03-27 | HOMOPOLAR TRANSFORMER WITH MAGNETIC CIRCUIT INSENSITIVE TO MECHANICAL CONSTRAINTS, AND MANUFACTURING METHOD THEREOF. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0509936A2 EP0509936A2 (en) | 1992-10-21 |
| EP0509936A3 EP0509936A3 (en) | 1993-05-19 |
| EP0509936B1 true EP0509936B1 (en) | 1995-08-30 |
Family
ID=9411259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92420074A Expired - Lifetime EP0509936B1 (en) | 1991-03-27 | 1992-03-13 | Homopolar transformer with magnetic circuit insensitive to mechanical stresses, and manufacturing method |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0509936B1 (en) |
| DE (1) | DE69204346T2 (en) |
| ES (1) | ES2079164T3 (en) |
| FR (1) | FR2674674B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007034532A1 (en) | 2007-07-24 | 2009-02-05 | Vacuumschmelze Gmbh & Co. Kg | Magnetic core, process for its production and residual current circuit breaker |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9312004U1 (en) * | 1993-08-11 | 1993-11-25 | Siemens Matsushita Components GmbH & Co. KG, 81541 München | Electrical component in chip design |
| JPH09246034A (en) * | 1996-03-07 | 1997-09-19 | Alps Electric Co Ltd | Pulse transformer core |
| DE59804488D1 (en) * | 1997-09-29 | 2002-07-25 | Epcos Ag | Inductive component and method for its production |
| DE29806050U1 (en) | 1998-04-02 | 1998-08-13 | Abb Patent Gmbh, 68309 Mannheim | Receptacle for a toroidal core transformer, preferably for a residual current circuit breaker |
| DE10134056B8 (en) | 2001-07-13 | 2014-05-28 | Vacuumschmelze Gmbh & Co. Kg | Process for the production of nanocrystalline magnetic cores and apparatus for carrying out the process |
| KR101228497B1 (en) * | 2011-11-25 | 2013-01-31 | 주식회사 이랜텍 | Transformer of improved joint strength |
| DE102012201002B4 (en) | 2012-01-24 | 2022-10-06 | Siemens Aktiengesellschaft | Summation current transformer housing, summation current transformer and residual current circuit breaker |
| KR101966749B1 (en) * | 2015-12-11 | 2019-04-08 | 주식회사 아모그린텍 | Current transformer with magnetic shielding |
| CN105976992A (en) * | 2016-07-05 | 2016-09-28 | 佛山诺亚电器有限公司 | High-overload internal protection distribution transformer |
| DE102018106449A1 (en) * | 2018-03-20 | 2019-09-26 | Vacuumschmelze Gmbh & Co. Kg | Magnetic assembly |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2523766A1 (en) * | 1982-03-22 | 1983-09-23 | Merlin Gerin | AC or DC differential leakage current detector - includes transformer linkage between two mains wires and oscillator detector controlling cut=out relay |
| NL8401185A (en) * | 1984-04-13 | 1985-11-01 | Philips Nv | TRANSFORMER WITH COAXIAL COILS. |
| JPH0239403A (en) * | 1988-07-28 | 1990-02-08 | Nagano Japan Radio Co | Method for fixing magnetic core |
| JPH0266908A (en) * | 1988-08-31 | 1990-03-07 | Nippon Ferrite Ltd | Magnetic core |
| JPH0654738B2 (en) * | 1989-06-16 | 1994-07-20 | 日立フェライト株式会社 | Magnetic core |
-
1991
- 1991-03-27 FR FR9103831A patent/FR2674674B1/en not_active Expired - Fee Related
-
1992
- 1992-03-13 EP EP92420074A patent/EP0509936B1/en not_active Expired - Lifetime
- 1992-03-13 ES ES92420074T patent/ES2079164T3/en not_active Expired - Lifetime
- 1992-03-13 DE DE1992604346 patent/DE69204346T2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN, Vol. 14, No. 241 (E-931)(4148), 22 Mai 1990 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007034532A1 (en) | 2007-07-24 | 2009-02-05 | Vacuumschmelze Gmbh & Co. Kg | Magnetic core, process for its production and residual current circuit breaker |
| US8344830B2 (en) | 2007-07-24 | 2013-01-01 | Vaccumschmelze Gmbh & Co. Kg | Magnet core; method for its production and residual current device |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2674674A1 (en) | 1992-10-02 |
| DE69204346T2 (en) | 1996-04-18 |
| ES2079164T3 (en) | 1996-01-01 |
| DE69204346D1 (en) | 1995-10-05 |
| EP0509936A3 (en) | 1993-05-19 |
| EP0509936A2 (en) | 1992-10-21 |
| FR2674674B1 (en) | 1993-10-22 |
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