EP0999565A1 - Measuring transformer for measuring an electric current - Google Patents
Measuring transformer for measuring an electric current Download PDFInfo
- Publication number
- EP0999565A1 EP0999565A1 EP99402756A EP99402756A EP0999565A1 EP 0999565 A1 EP0999565 A1 EP 0999565A1 EP 99402756 A EP99402756 A EP 99402756A EP 99402756 A EP99402756 A EP 99402756A EP 0999565 A1 EP0999565 A1 EP 0999565A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arrangement according
- flexible
- torus
- opening
- air gap
- 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.)
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Classifications
-
- 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 an arrangement for measuring a current. electric, of the type comprising a transformer measurement equipped with a toroid-shaped magnetic circuit opening and likely to close on a cable in which flows the current to be measured.
- Arrangements of this type which are known, include a rigid torus.
- This arrangement has the disadvantage major than the opening of this rigid torus, to enclose the cable, requires mechanical means which are complex and two opening areas that have a greater sensitivity to the original magnetic field external or internal and thus distort the current measurement primary.
- the weight of the arrangement also constitutes a disadvantage for larger magnetic circuits diameter.
- the object of the present invention is to provide a measuring arrangement of the type indicated above, which does not not have the disadvantages that have just been stated.
- the arrangement according to the invention is characterized in that the magnetic circuit is flexible and formed by stacking thin magnetic tapes and flexible.
- the bands magnetic are left free or are very little maintained and advantageously fixed together only at each end of the torus.
- the torus includes a device for opening and closing the quick click type.
- the device opening and closing is a device to nesting advantageously of the male-female type.
- the torus comprises a minimum air gap or an air gap which is suitable for house a magnetic sensor.
- the influence of the air gap is compensated by an additional winding positioned at said air gap.
- the magnetic circuit is surrounded by a flexible sheath.
- At less winding is carried out on the sheath in one or several layers and the whole thus formed is surrounded an outer sheath.
- Figure 1 is a schematic view in median section radial of a measurement arrangement according to this invention.
- Figure 2 is a sectional view along line II-II of figure 1.
- Figure 3 is a cutaway view, at larger ladder, in the direction of arrow III in FIG. 1 and shows the closing device of the flexible torus in its open position.
- Figure 4 is a view similar to Figure 3, but in a direction perpendicular to arrow III of the figure 1.
- the measurement arrangement according to the invention is designed for measurement of alternating or direct currents and includes essentially a transformer comprising, as it spring from the figures, a flexible magnetic circuit 1 in torus shape, which is made by assembly by stack of thin and flexible magnetic tapes 3 (figure 2). Strips 3 are left free or are very little maintained to allow free movement of these when handling the assembly. AT this end the bands are only fixed between them, anyway, at each end of the torus.
- the toroid To protect the toroid 1, it is slid in an insulating sheath 4. On the latter are made the winding (s) 5, in one or more layers, evenly distributed. Then the assembly thus obtained is surrounded by a sheath of exterior protection 6.
- the arrangement thus formed could be designed to have a minimum air gap 7.
- the air gap could also be designed to accommodate a magnetic sensor such as a Hall effect cell, magneto-resistant sensor, whorl or the like.
- the arrangement is provided with an opening device and closure 9 advantageously with rapid snap-on such a male / female type socket, with an air gap 7 which may be minimal or include accommodation for house the aforementioned magnetic sensor.
- the deformation of the torus is done in the plane of the torus, with sliding the strips on top of each other, so that the magnetic characteristics may be affected.
- the torus it is preferable to preform it, at the time of its manufacture, by stacking for example the strips of sheet metal on a template round shape.
- FIGS 3 and 4 illustrate, by way of example, a mode of the opening and closing device 9 of the toroidal arrangement, according to the present invention.
- This device comprises a male part 10 surrounding one end of the protective sheath exterior 6 and a second part 11 in the form of a socket of which a first portion 12 surrounds the second end of the outer sheath 6 and is extended by a second portion 13 intended to receive the male part 10 surrounding the first end.
- the socket 12 advantageously carries two fins removable 14 which extend parallel to the axis of the socket at diametrically opposite locations and make protruding beyond the free end of the portion of female socket 13 while also being fixed on the socket.
- the free protruding end of each fin 14 is bent at 15, radially towards the axis of the socket so as to form claws capable of engaging behind an annular flange 16 provided on the male part 10, at a distance predetermined from this end. This distance is chosen so that the claws 15 can snap behind the flange 16 when the part male 10 is correctly engaged in the female part 13 of the closing or opening device 9.
- the invention provides the possibility of reducing the lines leakage at the air gap, thanks to a winding of compensation 20 arranged around the air gap area, as seen in 20 in Figure 1.
- the invention offers the possibility of placing a sensor in the air gap.
- the sensor connection wires can be exited with the connecting cable 18 allowing the exit winding wires 5.
- the arrangement according to the invention makes it possible to measure leakage currents, with load or possibly depending on the charge cancellation principle with an amplifier operational in current input mode, currents alternating and continuous (with magnetic sensor suitable for induction measurement mode or flow cancellation with coil) or be associated with torus Rogowski principle (in measurement or with injection of current).
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
L'invention concerne un agencement de mesure d'un courant électrique, du type comprenant un transformateur de mesure pourvu d'un circuit magnétique en forme de tore ouvrant et susceptible de se refermer sur un câble dans lequel circule le courant à mesurer.The invention relates to an arrangement for measuring a current. electric, of the type comprising a transformer measurement equipped with a toroid-shaped magnetic circuit opening and likely to close on a cable in which flows the current to be measured.
Les agencements de ce type, qui sont connus, comportent un tore rigide. Cet agencement présente l'inconvénient majeur que l'ouverture de ce tore rigide, pour enserrer le câble, nécessite des moyens mécaniques qui sont complexes et deux zones d'ouverture qui ont une sensibilité plus grande au champ magnétique d'origine externe ou interne et faussent ainsi la mesure du courant primaire. De plus, la rigidité et l'encombrement de l'ensemble interdisent certaines accessibilités aux mesures. Le poids de l'agencement constitue également un inconvénient pour les circuits magnétiques de plus grand diamètre.Arrangements of this type, which are known, include a rigid torus. This arrangement has the disadvantage major than the opening of this rigid torus, to enclose the cable, requires mechanical means which are complex and two opening areas that have a greater sensitivity to the original magnetic field external or internal and thus distort the current measurement primary. In addition, the rigidity and size of all prohibit certain accessibility to measures. The weight of the arrangement also constitutes a disadvantage for larger magnetic circuits diameter.
La présente invention a pour but de proposer un agencement de mesure du type indiqué plus haut, qui ne présente pas les inconvénients qui viennent d'être énoncés.The object of the present invention is to provide a measuring arrangement of the type indicated above, which does not not have the disadvantages that have just been stated.
Pour atteindre ce but, l'agencement selon l'invention est caractérisé en ce que le circuit magnétique est souple et formé par l'empilement de bandes magnétiques fines et souples.To achieve this object, the arrangement according to the invention is characterized in that the magnetic circuit is flexible and formed by stacking thin magnetic tapes and flexible.
Selon une caractéristique de l'invention, les bandes magnétiques sont laissées libres ou sont très peu maintenues et avantageusement fixées entre elles seulement à chaque extrémité du tore. According to a characteristic of the invention, the bands magnetic are left free or are very little maintained and advantageously fixed together only at each end of the torus.
Selon une autre caractéristique de l'invention, le tore comporte un dispositif d'ouverture et de fermeture du type à encliquetage rapide.According to another characteristic of the invention, the torus includes a device for opening and closing the quick click type.
Selon une autre caractéristique, le dispositif d'ouverture et de fermeture est un dispositif à emboítement avantageusement du type mâle-femelle.According to another characteristic, the device opening and closing is a device to nesting advantageously of the male-female type.
Selon encore une autre caractéristique, le tore comporte un entrefer minimal ou un entrefer qui est adapté pour y loger un capteur magnétique.According to yet another characteristic, the torus comprises a minimum air gap or an air gap which is suitable for house a magnetic sensor.
Selon encore une autre caractéristique, l'influence de l'entrefer est compensée par un bobinage additionnel positionné au niveau dudit entrefer.According to yet another characteristic, the influence of the air gap is compensated by an additional winding positioned at said air gap.
Selon encore une autre caractéristique de l'invention, le circuit magnétique est entouré d'une gaine souple.According to yet another characteristic of the invention, the magnetic circuit is surrounded by a flexible sheath.
Selon encore une autre caractéristique de l'invention, au moins un bobinage est réalisé sur la gaine en une ou plusieurs couches et l'ensemble ainsi formé est entouré d'une gaine extérieure.According to yet another characteristic of the invention, at less winding is carried out on the sheath in one or several layers and the whole thus formed is surrounded an outer sheath.
L'invention sera mieux comprise et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaítront plus clairement dans la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquel :The invention will be better understood and other aims, features, details and benefits of it will appear more clearly in the description explanatory which will follow made with reference to the drawings attached diagrams given only by way of example illustrating an embodiment of the invention and in which:
La figure 1 est une vue schématique en coupe médiane radiale d'un agencement de mesure selon la présente invention. Figure 1 is a schematic view in median section radial of a measurement arrangement according to this invention.
La figure 2 est une vue en coupe le long de la ligne II-II de la figure 1.Figure 2 is a sectional view along line II-II of figure 1.
La figure 3 est une vue avec arrachement, à plus grande échelle, en direction de la flèche III de la figure 1 et montre le dispositif de fermeture du tore souple dans sa position ouverte.Figure 3 is a cutaway view, at larger ladder, in the direction of arrow III in FIG. 1 and shows the closing device of the flexible torus in its open position.
La figure 4 est une vue similaire à la figure 3, mais dans une direction perpendiculaire à la flèche III de la figure 1.Figure 4 is a view similar to Figure 3, but in a direction perpendicular to arrow III of the figure 1.
L'agencement de mesure selon l'invention est conçu pour
la mesure de courants alternatifs ou continus et comprend
essentiellement un transformateur comportant, comme il
ressort des figures, un circuit magnétique souple 1 en
forme de tore, qui est réalisé par assemblage par
empilement de bandes magnétiques fines et souples 3
(figure 2). Les bandes 3 sont laissées libres ou sont
très peu maintenues pour permettre le libre déplacement
de celles-ci lors de la manipulation de l'ensemble. A
cette fin les bandes sont seulement fixées entre elles,
de toute façon appropriée, à chaque extrémité du tore.The measurement arrangement according to the invention is designed for
measurement of alternating or direct currents and includes
essentially a transformer comprising, as it
spring from the figures, a flexible
Pour protéger le tore magnétique 1, celui-ci est glissé
dans une gaine isolante 4. Sur cette dernière sont
réalisés le ou les bobinages 5, en une ou plusieurs
couches, de façon uniforme et bien répartie. Puis
l'ensemble ainsi obtenu est entouré d'une gaine de
protection extérieure 6.To protect the
L'agencement ainsi formé pourrait être conçu pour avoir un entrefer 7 minimal. L'entrefer pourrait aussi être conçu de façon à pouvoir y loger un capteur magnétique tel qu'une cellule à effet Hall, capteur magnéto-résistant, spire ou analogue. The arrangement thus formed could be designed to have a minimum air gap 7. The air gap could also be designed to accommodate a magnetic sensor such as a Hall effect cell, magneto-resistant sensor, whorl or the like.
L'agencement est pourvu d'un dispositif d'ouverture et de fermeture 9 avantageusement à encliquetage rapide tel qu'un emboítement du type mâle/femelle, avec un entrefer 7 qui peut être minimal ou comporter un logement pour y loger le capteur magnétique susmentionné.The arrangement is provided with an opening device and closure 9 advantageously with rapid snap-on such a male / female type socket, with an air gap 7 which may be minimal or include accommodation for house the aforementioned magnetic sensor.
La déformation du tore se fait dans le plan du tore, avec glissement des bandes les unes sur les autres, pour que les caractéristiques magnétiques soient peut affectées.The deformation of the torus is done in the plane of the torus, with sliding the strips on top of each other, so that the magnetic characteristics may be affected.
Pour la réalisation du tore, il est préférable de préformer celui-ci, au moment de sa fabrication, en empilant par exemple les bandes de tôle sur un gabarit de forme ronde.For the realization of the torus, it is preferable to preform it, at the time of its manufacture, by stacking for example the strips of sheet metal on a template round shape.
Les figures 3 et 4 illustrent, à titre d'exemple, un mode
de réalisation du dispositif d'ouverture et de fermeture
9 de l'agencement en forme de tore, selon la présente
invention. Ce dispositif comporte une partie mâle 10
entourant une extrémité de la gaine de protection
extérieure 6 et une deuxième partie 11 en forme d'une
douille dont une première portion 12 entoure la deuxième
extrémité de la gaine extérieure 6 et se prolonge par une
seconde portion 13 déstinée à recevoir la partie mâle 10
entourant la première extrémité.Figures 3 and 4 illustrate, by way of example, a mode
of the opening and closing device
9 of the toroidal arrangement, according to the present
invention. This device comprises a
La douille 12 porte deux aillettes avantageusement
amovibles 14 qui s'étendent parallèlement à l'axe de la
douille à des emplacements diamètralement opposés et font
saillie au-delà de l'extrémité libre de la portion de
douille femelle 13 en étant par ailleurs fixée sur la
douille. L'extrémité libre en saillie de chaque aillette
14 est recourbée en 15, radialement vers l'axe de la
douille de façon à former des griffes susceptibles de
venir en prise derrière une collerette annulaire 16
prévue sur la partie mâle 10, à une distance
prédéterminée de cette extrémité. Cette distance est
choisie de telle façon que les griffes 15 puissent
s'encliqueter derrière la collerette 16 lorsque la partie
mâle 10 est correctement engagée dans la partie femelle
13 du dispositif de fermeture ou d'ouverture 9.The
L'invention prévoit la possibilité de diminuer les lignes
de fuite au niveau de l'entrefer, grâce à un bobinage de
compensation 20 disposé autour de la zone de l'entrefer,
comme on le voit en 20 sur la figure 1.The invention provides the possibility of reducing the lines
leakage at the air gap, thanks to a winding of
Dans le cas du mode de réalisation du dispositif de
fermeture, selon les figures 3 et 4, le bobinage serait
disposé avantageusement dans la partie femelle dans les
portions 12 et 13. Ainsi, l'influence de l'entrefer est
réduite.In the case of the embodiment of the
closure, according to Figures 3 and 4, the winding would
advantageously arranged in the female part in the
Comme il a été indiqué plus haut, l'invention offre la
possibilité de placer un capteur dans l'entrefer. A cette
fin, on pourrait placer le capteur sur la face frontale
du tore de la partie femelle en dimensionnant la longueur
de l'extrémité mâle 10 de façon à laisser un entrefer
d'une longueur appropriée entre les deux extrémités du
tore. Les fils de connexion du capteur peuvent être
sortis avec le câble de liaison 18 permettant la sortie
des fils de bobinage 5.As indicated above, the invention offers the
possibility of placing a sensor in the air gap. At this
end, we could place the sensor on the front
of the torus of the female part by dimensioning the length
from the
L'agencement selon l'invention permet de mesurer des courants de fuite, avec charge ou éventuellement selon le principe de l'annulation de charge avec un amplificateur opérationnel en mode entrée courant, des courants alternatifs et continus (avec capteur magnétique approprié en mode de mesure d'induction ou en mode d'annulation de flux avec bobine) ou être associé au principe de tore Rogowski (en mesure ou avec injection de courant).The arrangement according to the invention makes it possible to measure leakage currents, with load or possibly depending on the charge cancellation principle with an amplifier operational in current input mode, currents alternating and continuous (with magnetic sensor suitable for induction measurement mode or flow cancellation with coil) or be associated with torus Rogowski principle (in measurement or with injection of current).
Claims (10)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9814020 | 1998-11-06 | ||
| FR9814020 | 1998-11-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0999565A1 true EP0999565A1 (en) | 2000-05-10 |
Family
ID=9532479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99402756A Withdrawn EP0999565A1 (en) | 1998-11-06 | 1999-11-05 | Measuring transformer for measuring an electric current |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP0999565A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010087703A1 (en) * | 2009-01-27 | 2010-08-05 | Liandon B.V. | End user electricity network, use, method and assembly |
| EP2511712A1 (en) | 2011-04-11 | 2012-10-17 | Schneider Electric Industries SAS | Device for measuring electric current comprising a Rogowski coil |
| EP2592426A1 (en) | 2011-11-10 | 2013-05-15 | Schneider Electric Industries SAS | Sensor for measuring a current in an electric cable |
| CN103562734A (en) * | 2011-05-23 | 2014-02-05 | 菲尼克斯电气公司 | Current measuring transformer |
| WO2019135044A1 (en) | 2018-01-05 | 2019-07-11 | Socomec | Split-core current transformer comprising a flexible magnetic core |
| WO2020178084A1 (en) * | 2019-03-07 | 2020-09-10 | Socomec | Energy recovery device on at least one power conductor and method for manufacturing the recovery device |
| US12027305B2 (en) | 2018-01-05 | 2024-07-02 | Socomec | Openable current transformer comprising a flexible magnetic core |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE521886C (en) * | 1929-09-15 | 1931-03-27 | Koch & Sterzel Akt Ges | Method for laying a toroidal current transformer around a conductor, especially with inaccessible ends |
| US3725832A (en) * | 1971-10-12 | 1973-04-03 | Schwertzer E Mfg Co Inc | Magnetic core structure |
| FR2312844A1 (en) * | 1975-05-29 | 1976-12-24 | Cem Comp Electro Mec | Measuring transformer with Hall effect probe - uses resilient rectangular core made of elastomer with probe in air gap |
| FR2640416A1 (en) * | 1988-12-13 | 1990-06-15 | Delta Dore | Current transformer with annular magnetic circuit |
| EP0497681A1 (en) * | 1991-01-29 | 1992-08-05 | Etablissements Bardin | Transformer torus and method of making such a torus |
| EP0606181A1 (en) * | 1993-01-08 | 1994-07-13 | Etablissements Bardin | A transformer, in particular a measuring transformer e.g. for detecting faults in electric cables |
| JPH08250351A (en) * | 1995-03-14 | 1996-09-27 | Tohoku Denki Hoan Kyokai | Current transformer |
-
1999
- 1999-11-05 EP EP99402756A patent/EP0999565A1/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE521886C (en) * | 1929-09-15 | 1931-03-27 | Koch & Sterzel Akt Ges | Method for laying a toroidal current transformer around a conductor, especially with inaccessible ends |
| US3725832A (en) * | 1971-10-12 | 1973-04-03 | Schwertzer E Mfg Co Inc | Magnetic core structure |
| FR2312844A1 (en) * | 1975-05-29 | 1976-12-24 | Cem Comp Electro Mec | Measuring transformer with Hall effect probe - uses resilient rectangular core made of elastomer with probe in air gap |
| FR2640416A1 (en) * | 1988-12-13 | 1990-06-15 | Delta Dore | Current transformer with annular magnetic circuit |
| EP0497681A1 (en) * | 1991-01-29 | 1992-08-05 | Etablissements Bardin | Transformer torus and method of making such a torus |
| EP0606181A1 (en) * | 1993-01-08 | 1994-07-13 | Etablissements Bardin | A transformer, in particular a measuring transformer e.g. for detecting faults in electric cables |
| JPH08250351A (en) * | 1995-03-14 | 1996-09-27 | Tohoku Denki Hoan Kyokai | Current transformer |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 097, no. 001 31 January 1997 (1997-01-31) * |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010087703A1 (en) * | 2009-01-27 | 2010-08-05 | Liandon B.V. | End user electricity network, use, method and assembly |
| EP2511712A1 (en) | 2011-04-11 | 2012-10-17 | Schneider Electric Industries SAS | Device for measuring electric current comprising a Rogowski coil |
| RU2594610C2 (en) * | 2011-04-11 | 2016-08-20 | Шнейдер Электрик Эндюстри Сас | Device and assembly for measuring electric current |
| US9267970B2 (en) | 2011-04-11 | 2016-02-23 | Schneider Electric Industries Sas | Device for measuring an electric current in a cable |
| US9165709B2 (en) | 2011-05-23 | 2015-10-20 | Phoenix Contact Gmbh & Co Kg | Current transformer |
| CN103562734A (en) * | 2011-05-23 | 2014-02-05 | 菲尼克斯电气公司 | Current measuring transformer |
| CN103562734B (en) * | 2011-05-23 | 2016-03-30 | 菲尼克斯电气公司 | Current measurement converter |
| EP2715374B1 (en) * | 2011-05-23 | 2016-07-20 | Phoenix Contact GmbH & Co. KG | Current transformer |
| EP2592426A1 (en) | 2011-11-10 | 2013-05-15 | Schneider Electric Industries SAS | Sensor for measuring a current in an electric cable |
| WO2019135044A1 (en) | 2018-01-05 | 2019-07-11 | Socomec | Split-core current transformer comprising a flexible magnetic core |
| FR3076657A1 (en) * | 2018-01-05 | 2019-07-12 | Socomec | OPEN CURRENT CURRENT TRANSFORMER WITH FLEXIBLE MAGNETIC CORE |
| CN111630615A (en) * | 2018-01-05 | 2020-09-04 | 溯高美公司 | Open-close type current transformer comprising flexible magnetic core |
| US12027305B2 (en) | 2018-01-05 | 2024-07-02 | Socomec | Openable current transformer comprising a flexible magnetic core |
| WO2020178084A1 (en) * | 2019-03-07 | 2020-09-10 | Socomec | Energy recovery device on at least one power conductor and method for manufacturing the recovery device |
| FR3093588A1 (en) * | 2019-03-07 | 2020-09-11 | Socomec | ENERGY RECOVERY DEVICE ON AT LEAST ONE POWER CONDUCTOR AND MANUFACTURING PROCESS OF SAID RECOVERY DEVICE |
| US11749425B2 (en) | 2019-03-07 | 2023-09-05 | Socomec | Energy recovery device on at least one power conductor and method for manufacturing the recovery device |
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