WO2012130687A1 - Current transformer for three-phase equipment - Google Patents

Current transformer for three-phase equipment Download PDF

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Publication number
WO2012130687A1
WO2012130687A1 PCT/EP2012/054988 EP2012054988W WO2012130687A1 WO 2012130687 A1 WO2012130687 A1 WO 2012130687A1 EP 2012054988 W EP2012054988 W EP 2012054988W WO 2012130687 A1 WO2012130687 A1 WO 2012130687A1
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WO
WIPO (PCT)
Prior art keywords
current transformer
holding plate
plate
transformer according
windings
Prior art date
Application number
PCT/EP2012/054988
Other languages
French (fr)
Inventor
Carmelo Gimeno
Original Assignee
Alstom Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alstom Technology Ltd filed Critical Alstom Technology Ltd
Publication of WO2012130687A1 publication Critical patent/WO2012130687A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B13/00—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle
    • H02B13/02—Arrangement of switchgear in which switches are enclosed in, or structurally associated with, a casing, e.g. cubicle with metal casing
    • H02B13/035—Gas-insulated switchgear
    • H02B13/0356—Mounting of monitoring devices, e.g. current transformers
    • 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
    • H01F38/38—Instruments transformers for polyphase ac

Definitions

  • the subject of the invention is a current transformer for three-phase switchgear, in which three parallel cables conduct the current phases, and the essential element of the transformer comprises three windings (or, often, three sets of superimposed windings) respectively surrounding the phase cables and ensuring the transformation of the current.
  • Windings or windings assemblies shall be held at fixed positions along the cables. This need is respected in different ways in the arrangements of existing transformers.
  • CH-A-614,554 the coils are enclosed in a metal capsule and held between curved support tabs, established at the ends of the capsule.
  • Such a device has the disadvantage that the capsule has a relatively complicated shape, the manufacturing cost of which weighs on that of the assembly.
  • the bent legs are also likely to increase the size of the transformer more significantly than other holding devices.
  • this device was designed for single-phase equipment, and the way or the interest to apply it to a three-phase switchgear is not suggested.
  • FR-A-230309 which relates to a transformer for three-phase switchgear
  • the phase cables are arranged in tubes placed side by side and surrounded by a metal cylinder.
  • Two parallel bearing plates (14 and 15 in this document) are arranged through sections of the cylinder, with holes for the passage of the tubes.
  • Each of the tubes 6 comprises two trios of legs 7 and 8 respectively screwed to the support plates by bolting.
  • the coils 20 and 21 surround the tube and are held in place by pressure screw devices 24 which rest on one of the tabs and press the coils against the opposite tab. This device is complicated, among other things because it requires three of these screw devices for each set of windings, that is nine for the transformer.
  • documents FR-A-2 230 051 and US-A-3 942 106 which describe similar devices.
  • US-A-5,367,432 discloses a device wherein the coils are held in a prismatic cell composed of elements bolted together and each comprising an upper plate, a lower plate and a peripheral socket uniting them. As in other designs, the peripheral wall or tube weighs down the device.
  • US Pat. No. 4,338,657 describes a transformer where three stacks of windings established around an electric cable 19 are held between two plates 18, one upper and the other lower, by nine columns 16 and 17 of complex shape, indented for to house the windings at different levels, without the coils form a compressed stack.
  • EP-A-0 229 220 describes a three-phase equipment where the sets of coils, still threaded around the cables, are retained between a common support plate and respective holding plates by threaded parts that will be called tie rods.
  • This arrangement is perhaps simpler and less cumbersome, but it also has the disadvantage that the holding pieces are numerous, since in addition to the common support plate to the three sets of coils, there are three plates of holding and nine tie rods.
  • a first object of the invention is to provide a transformer arrangement of the kind where three sets of coils must be maintained around as many electrical cables, which is simpler and comprises in particular a reduced number of holding pieces of the sets of coils. windings; we have seen that these maintenance parts were still nine in number - three for each of the stacks - in the previous designs.
  • a current transformer for three-phase electrical equipment comprising three parallel phase cables, three sets of windings respectively surrounding the phase cables, a support plate common to the winding assemblies, and holding rods for winding assemblies which are connected to the common support phase, characterized in that it comprises a holding plate common to the sets of winding, which are retained between said holding plate and said support plate, and to which said tie rods are also linked, the tie rods being less than nine.
  • the known art does not suggest compressing several sets of neighboring windings by a common support plate and a holding plate also common, that is to say by the same device, since even in the last document the devices are distinct, and the common support plate does not provide significant improvement alone on three completely separate devices.
  • the use of tie rods makes it possible to obtain sufficient clamping of the stacks, by bringing the two plates closer together, and possibly to equalize the clamping by means of a slight bending of the holding plate, which is generally thinner than the support plate.
  • the retaining plate be electrically insulating; it can be, at least partially, in Bakelite. Electrically insulating boards also advantageously extend between the windings for each of the winding assemblies, and between the winding assemblies and the backing plate, which also reduces the risk of short circuits in case of windings. wear of insulators coating winding wires or magnetic field changes due to eddy currents.
  • the holding plate is not necessarily circular, but it can instead take other forms to reduce its cost; it can in particular be triangular with cut vertices. It may include a central bore to increase its flexibility and allow it to tighten quite uniformly the three sets of windings.
  • the transformer may comprise an elastic plate between the winding assemblies and the holding plate, in order to avoid the consequences of shocks such as earthquakes.
  • the invention relates to an electrical apparatus comprising the preceding current transformer, and in particular an air-atmosphere transformer, the phase cables being enclosed in tubes and, for their part, to a gaseous atmosphere other than air, for example SF 6 .
  • FIG. 1 shows the temperature in axial view
  • Figure 2 is a partial diametrical section.
  • the transformer comprises three phase cables 1, 2 and 3, parallel, each surrounded by a tube 4, 5 and 6 and passing through the transformer 7 according to the invention; the latter comprises a support plate 8 of steel or cast aluminum which is one of its ends, a closure plate 9 which is the other of its ends and which is connected to the previous by bolts 10, and it contains three winding assemblies 11, 12 and 13 respectively threaded around the tubes 4, 5 and 6.
  • These sets are identical and each of them comprises here, as seen in Figure 2, three coils 14, 15 and 16 superimposed; their number could be any, and in particular be reduced to a single winding.
  • the tubes 4, 5 and 6 contain an SF 6 atmosphere, and the transformer 7 itself is in an air atmosphere.
  • the appliance plate 8 has three lugs 17, 18 and 19 distributed over one circumference and each receiving one end of a tie rod 20, 21 and 22 whose other end is engaged through a holding plate 24 adjacent to the plate closing 9 but separated from it.
  • Each of the tie rods 20, 21 and 22 is formed essentially of a threaded rod 23.
  • Nuts 25 engaged on the threaded rods 23 immobilize the device: one of them blocks each threaded rod 23 by pressing on the tab 17, 18 or 19 respectively, and two others, pressed against each other, retain the holding plate 24.
  • the winding assemblies 11, 12 and 13 are thus retained against the support plate 8 and the holding plate 24 by Tie rods 20, 21 and 22.
  • Tie rods 20, 21 and 22 each extends between two sets of coils 11, 12 and 13, and their arrangements are circular around a central axis of the transformer 7.
  • the stacks further comprise insulating boards 26, 27 and 28 arranged between the coils 14, 15 and 16 and between the coils 16 and the support plate 28, as well as an elastic plate, for example made of polymer, 29 between the holding plate 24 and the adjacent coil 14.
  • the coils 14, 15 and 16 are thus isolated from each other and isolated from the other elements of the transformer, which reduces the risk of occurrence of eddy currents and short circuits.
  • the elastic plate 29 reduces the effects of shocks such as earthquakes.
  • the support plate 24 is advantageously also insulating, for example bakelite or bakelized cardboard. Its shape is advantageously non-circular, for example as seen in FIG. 1, in a triangle with cut vertices, and therefore more extended at the location of the winding assemblies 11, 12 and 13 in order to cover most of them while having a moderate area to reduce its cost. It is pierced at the place of the tubes 4, 5 and 6 with play.
  • this central bore 30 which has a diameter advantageously equal to or greater than 7% of the largest dimension, relaxes the holding plate 24 by allowing it to flex and clamp the sets of windings 11, 12 and 13 evenly by accepting settings unequal nuts 25 retaining the holding plate 24.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Transformers For Measuring Instruments (AREA)

Abstract

The invention relates to a current transformer comprising three winding assemblies (11, 12, 13) positioned around three three-phase current cables (1, 2, 3) and retained in position by a small number of ties (20, 21, 22) (e.g. three) between a support plate (8) and a preferably insulating holding plate (24) that is pierced at the centre (30) thereof, said holding plate (24) being common to all of the winding assemblies as is the supporting plate (8). The construction of the assembly has been simplified.

Description

TRANSFORMATEUR DE COURANT POUR APPAREILLAGE TRIPHASE  CURRENT TRANSFORMER FOR THREE-PHASE EQUIPMENT
DESCRIPTIONDESCRIPTION
DOMAINE TECHNIQUE TECHNICAL AREA
Le sujet de l'invention est un transformateur de courant pour appareillage triphasé, dans lequel trois câbles parallèles conduisent les phases de courant, et l'élément essentiel du transformateur comprend trois bobinages (ou, souvent, trois ensembles de bobinages superposés) entourant respectivement les câbles de phase et assurant la transformation du courant.  The subject of the invention is a current transformer for three-phase switchgear, in which three parallel cables conduct the current phases, and the essential element of the transformer comprises three windings (or, often, three sets of superimposed windings) respectively surrounding the phase cables and ensuring the transformation of the current.
Les bobinages ou les ensembles de bobinages doivent être maintenus à des positions fixes le long des câbles. Cette nécessité est respectée de façons différentes dans les agencements de transformateurs existants. Dans le document CH-A-614 554, les bobinages sont enfermés dans une capsule métallique et maintenus entre des pattes d'appui courbées, établies aux extrémités de la capsule. Un tel dispositif a l'inconvénient que la capsule a une forme relativement compliquée, dont le coût de fabrication pèse sur celui de l'ensemble. Les pattes recourbées sont aussi susceptibles d'augmenter l'encombrement du transformateur de façon plus importante que d'autres dispositifs de maintien. Enfin, ce dispositif a été conçu pour un appareillage monophasé, et la façon ou l'intérêt de l'appliquer à un appareillage triphasé n'est pas suggéré.  Windings or windings assemblies shall be held at fixed positions along the cables. This need is respected in different ways in the arrangements of existing transformers. In CH-A-614,554, the coils are enclosed in a metal capsule and held between curved support tabs, established at the ends of the capsule. Such a device has the disadvantage that the capsule has a relatively complicated shape, the manufacturing cost of which weighs on that of the assembly. The bent legs are also likely to increase the size of the transformer more significantly than other holding devices. Finally, this device was designed for single-phase equipment, and the way or the interest to apply it to a three-phase switchgear is not suggested.
Dans le document DE-A-2 325 451 (ou In DE-A-2 325 451 (or
FR-A-2 230 049), qui est relatif à un transformateur pour appareillage triphasé, les câbles de phase sont disposés dans des tubes placés côte à côte et entourés par un cylindre métallique. Deux plaques d'appui parallèles (14 et 15 dans ce document) sont disposées à travers des sections du cylindre, avec des trous pour le passage des tubes. Chacun des tubes 6 comprend deux trios de pattes 7 et 8 respectivement vissés aux plaques d'appui par des boulonnages. Les bobinages 20 et 21 entourent le tube et sont maintenus en place par des dispositifs à vis de pression 24 qui s'appuient sur une des pattes et pressent les bobinages contre la patte opposée. Ce dispositif est compliqué, entre autres parce qu'il nécessite trois de ces dispositifs à vis pour chacun des ensembles de bobinages, c'est-à-dire neuf pour le transformateur. La même conclusion s'impose pour les documents FR-A-2 230 051 et US-A-3 942 106, qui décrivent des dispositifs analogues . FR-A-230309), which relates to a transformer for three-phase switchgear, the phase cables are arranged in tubes placed side by side and surrounded by a metal cylinder. Two parallel bearing plates (14 and 15 in this document) are arranged through sections of the cylinder, with holes for the passage of the tubes. Each of the tubes 6 comprises two trios of legs 7 and 8 respectively screwed to the support plates by bolting. The coils 20 and 21 surround the tube and are held in place by pressure screw devices 24 which rest on one of the tabs and press the coils against the opposite tab. This device is complicated, among other things because it requires three of these screw devices for each set of windings, that is nine for the transformer. The same conclusion applies to documents FR-A-2 230 051 and US-A-3 942 106, which describe similar devices.
US-A-5 367 432 décrit un dispositif où les bobinages sont maintenus dans une cellule prismatique composés d'éléments boulonnés entre eux et comprenant chacun une plaque supérieure, une plaque inférieure et une prise périphérique les unissant. Comme dans d'autres conceptions, la paroi périphérique ou le tube alourdit le dispositif.  US-A-5,367,432 discloses a device wherein the coils are held in a prismatic cell composed of elements bolted together and each comprising an upper plate, a lower plate and a peripheral socket uniting them. As in other designs, the peripheral wall or tube weighs down the device.
US-A-4 338 657 décrit un transformateur où trois empilements de bobinages établis autour d'un câble électrique 19 sont retenus entre deux plaques 18, une supérieure et l'autre inférieure, par neuf colonnes 16 et 17 de forme complexe, échancrées pour loger les bobinages à des niveaux différents, sans que les bobinages forment un empilement comprimé. US Pat. No. 4,338,657 describes a transformer where three stacks of windings established around an electric cable 19 are held between two plates 18, one upper and the other lower, by nine columns 16 and 17 of complex shape, indented for to house the windings at different levels, without the coils form a compressed stack.
Et EP-A-0 229 220 décrit un appareillage triphasé où les ensembles de bobinages, encore enfilés autour des câbles, sont retenus entre une plaque d'appui commune et des plaques de maintien respectives par des pièces filetées qu'on appellera tirants. Cette disposition est peut-être plus simple et moins encombrante, mais elle présente aussi l'inconvénient que les pièces de maintien sont nombreuses, puisqu'en plus de la plaque d'appui commune aux trois ensembles de bobinages, on trouve les trois plaques de maintien et neuf tirants de liaison.  And EP-A-0 229 220 describes a three-phase equipment where the sets of coils, still threaded around the cables, are retained between a common support plate and respective holding plates by threaded parts that will be called tie rods. This arrangement is perhaps simpler and less cumbersome, but it also has the disadvantage that the holding pieces are numerous, since in addition to the common support plate to the three sets of coils, there are three plates of holding and nine tie rods.
Un premier objet de l'invention est de proposer un agencement de transformateur du genre où trois ensembles de bobinages doivent être maintenus autour d'autant de câbles électriques, qui soit plus simple et comporte en particulier un nombre réduit de pièces de maintien des ensembles de bobinages ; on a vu que ces pièces de maintien étaient toujours au nombre de neuf - trois pour chacun des empilements - dans les conceptions précédentes.  A first object of the invention is to provide a transformer arrangement of the kind where three sets of coils must be maintained around as many electrical cables, which is simpler and comprises in particular a reduced number of holding pieces of the sets of coils. windings; we have seen that these maintenance parts were still nine in number - three for each of the stacks - in the previous designs.
Selon l'invention, cet objet est atteint par un transformateur de courant pour appareillage électrique triphasé, comprenant trois câbles de phase parallèles, trois ensembles de bobinages entourant respectivement les câbles de phase, une plaque d'appui commune aux ensembles de bobinage, et des tirants de maintien des ensembles de bobinages qui sont liés à la phase commune d'appui, caractérisé en ce qu'il comprend une plaque de maintien commune aux ensembles de bobinage, qui sont retenus entre ladite plaque de maintien et ladite plaque d'appui, et à laquelle lesdits tirants sont aussi liés, les tirants étant en nombre inférieur à neuf. According to the invention, this object is achieved by a current transformer for three-phase electrical equipment, comprising three parallel phase cables, three sets of windings respectively surrounding the phase cables, a support plate common to the winding assemblies, and holding rods for winding assemblies which are connected to the common support phase, characterized in that it comprises a holding plate common to the sets of winding, which are retained between said holding plate and said support plate, and to which said tie rods are also linked, the tie rods being less than nine.
En utilisant une seule plaque de maintien, combinée à des tirants de liaison des deux plaques, il est possible de diminuer le nombre de ces derniers. Selon une disposition favorable, ils sont au nombre de trois seulement et disposés chacun entre deux des ensembles de bobinages sur des cercles concentriques à la plaque d'appui ou à la plaque de maintien.  By using a single holding plate, combined with tie rods of the two plates, it is possible to reduce the number of these. According to a favorable arrangement, there are only three of them and each disposed between two sets of coils on circles concentric with the support plate or the holding plate.
L'art connu, représenté par les trois documents décrits plus haut, ne suggère pas de comprimer plusieurs ensembles de bobinages voisins par une plaque d'appui commune et une plaque de maintien elle aussi commune, c'est-à-dire par un même dispositif, puisque même dans le dernier document les dispositifs sont distincts, et la plaque d'appui commune ne procure pas à elle seule d'amélioration notable sur trois dispositifs complètement distincts. L'utilisation de tirants permet d'obtenir un serrage suffisant des empilements, en rapprochant les deux plaques l'une de l'autre, et éventuellement d'égaliser le serrage grâce à une légère flexion de la plaque de maintien, généralement plus fine que la plaque de support .  The known art, represented by the three documents described above, does not suggest compressing several sets of neighboring windings by a common support plate and a holding plate also common, that is to say by the same device, since even in the last document the devices are distinct, and the common support plate does not provide significant improvement alone on three completely separate devices. The use of tie rods makes it possible to obtain sufficient clamping of the stacks, by bringing the two plates closer together, and possibly to equalize the clamping by means of a slight bending of the holding plate, which is generally thinner than the support plate.
Contrairement aux conceptions couramment répandues, on préconise que la plaque de maintien soit isolante de l'électricité ; elle peut être, au moins partiellement, en bakélite. De même, des plaquettes isolantes de l'électricité s'étendent avantageusement entre les bobinages pour chacun des ensembles de bobinages, et entre les ensembles de bobinages et la plaque d'appui, ce qui diminue aussi les risques de courts-circuits en cas d'usure des isolants enrobant les fils des bobinages ou les altérations de champ magnétique dues à des courants de Foucault. Unlike commonly used designs, it is recommended that the retaining plate be electrically insulating; it can be, at least partially, in Bakelite. Electrically insulating boards also advantageously extend between the windings for each of the winding assemblies, and between the winding assemblies and the backing plate, which also reduces the risk of short circuits in case of windings. wear of insulators coating winding wires or magnetic field changes due to eddy currents.
La plaque de maintien n'est pas nécessairement circulaire, mais elle peut au contraire prendre d'autres formes pour diminuer son coût ; elle peut notamment être triangulaire à sommets coupés. Elle peut comprendre un perçage central afin d'augmenter sa souplesse et de lui permettre de serrer de façon assez uniforme les trois ensembles de bobinages.  The holding plate is not necessarily circular, but it can instead take other forms to reduce its cost; it can in particular be triangular with cut vertices. It may include a central bore to increase its flexibility and allow it to tighten quite uniformly the three sets of windings.
Le transformateur peut comprendre une plaque élastique entre les ensembles de bobinage et la plaque de maintien, afin d'éviter les conséquences de chocs tels que les tremblements de terre.  The transformer may comprise an elastic plate between the winding assemblies and the holding plate, in order to avoid the consequences of shocks such as earthquakes.
L'invention est relative à un appareillage électrique comprenant le transformateur de courant précédent, et notamment un transformateur à atmosphère d'air, les câbles de phase étant enfermés dans des tubes et, eux, à atmosphère gazeuse autre que d'air, par exemple de SF6. The invention relates to an electrical apparatus comprising the preceding current transformer, and in particular an air-atmosphere transformer, the phase cables being enclosed in tubes and, for their part, to a gaseous atmosphere other than air, for example SF 6 .
L'invention sera maintenant décrite en liaison aux figures, qui en représentent un mode de réalisation particulier donné à titre illustratif .  The invention will now be described with reference to the figures, which represent a particular embodiment given for illustrative purposes.
La figure 1 représente la température en vue axiale, et la figure 2 est une coupe diamétrale partielle . Le transformateur comprend trois câbles de phase 1, 2 et 3, parallèles, entourés chacun par un tube 4, 5 et 6 et traversant le transformateur 7 conforme à l'invention ; ce dernier comprend une plaque d'appui 8 en acier ou aluminium moulé qui constitue une de ses extrémités, une plaque de fermeture 9 qui constitue l'autre de ses extrémités et qui est reliée à la précédente par des boulons 10, et il contient trois ensembles de bobinages 11, 12 et 13 respectivement enfilés autour des tubes 4, 5 et 6. Ces ensembles sont identiques et chacun d'eux comprend ici, comme on le voit à la figure 2, trois bobinages 14, 15 et 16 superposés ; leur nombre pourrait être quelconque, et en particulier se réduire à un seul bobinage. Les tubes 4, 5 et 6 contiennent une atmosphère de SF6, et le transformateur 7 lui-même est à atmosphère d'air. Figure 1 shows the temperature in axial view, and Figure 2 is a partial diametrical section. The transformer comprises three phase cables 1, 2 and 3, parallel, each surrounded by a tube 4, 5 and 6 and passing through the transformer 7 according to the invention; the latter comprises a support plate 8 of steel or cast aluminum which is one of its ends, a closure plate 9 which is the other of its ends and which is connected to the previous by bolts 10, and it contains three winding assemblies 11, 12 and 13 respectively threaded around the tubes 4, 5 and 6. These sets are identical and each of them comprises here, as seen in Figure 2, three coils 14, 15 and 16 superimposed; their number could be any, and in particular be reduced to a single winding. The tubes 4, 5 and 6 contain an SF 6 atmosphere, and the transformer 7 itself is in an air atmosphere.
La plaque d'appareil 8 possède trois pattes 17, 18 et 19 réparties sur une circonférence et recevant chacune une extrémité d'un tirant 20, 21 et 22 dont l'autre extrémité est engagée à travers une plaque de maintien 24 adjacente à la plaque de fermeture 9 mais séparée d'elle. Chacun des tirants 20, 21 et 22 est formé essentiellement d'une tige filetée 23. Des écrous 25 engagés sur les tiges filetées 23 immobilisent le dispositif : l'un d'eux bloque chaque tige filetée 23 en pressant sur la patte 17, 18 ou 19 respective, et deux autres, pressés l'un contre l'autre, retiennent la plaque de maintien 24. Les ensembles de bobinage 11, 12 et 13 sont ainsi retenus contre la plaque d'appui 8 et la plaque de maintien 24 par les tirants 20, 21 et 22. Les tirants 20, 21 et 22 s'étendent chacun entre deux des ensembles de bobinages 11, 12 et 13, et leurs dispositions sont circulaires autour d'un axe central du transformateur 7. Les empilements comprennent encore des plaquettes isolantes 26, 27 et 28 disposées entre les bobinages 14, 15 et 16 et entre les bobinages 16 et la plaque d'appui 28, ainsi qu'une plaque élastique, par exemple en polymère, 29 entre la plaque de maintien 24 et le bobinage 14 adjacent. Les bobinages 14, 15 et 16 sont ainsi isolés les uns des autres et isolés des autres éléments du transformateur, ce qui réduit les risques d'apparition de courants de Foucault et de courts-circuits. La plaque élastique 29 réduit les effets de chocs tels que les tremblements de terre. The appliance plate 8 has three lugs 17, 18 and 19 distributed over one circumference and each receiving one end of a tie rod 20, 21 and 22 whose other end is engaged through a holding plate 24 adjacent to the plate closing 9 but separated from it. Each of the tie rods 20, 21 and 22 is formed essentially of a threaded rod 23. Nuts 25 engaged on the threaded rods 23 immobilize the device: one of them blocks each threaded rod 23 by pressing on the tab 17, 18 or 19 respectively, and two others, pressed against each other, retain the holding plate 24. The winding assemblies 11, 12 and 13 are thus retained against the support plate 8 and the holding plate 24 by Tie rods 20, 21 and 22. Tie rods 20, 21 and 22 each extends between two sets of coils 11, 12 and 13, and their arrangements are circular around a central axis of the transformer 7. The stacks further comprise insulating boards 26, 27 and 28 arranged between the coils 14, 15 and 16 and between the coils 16 and the support plate 28, as well as an elastic plate, for example made of polymer, 29 between the holding plate 24 and the adjacent coil 14. The coils 14, 15 and 16 are thus isolated from each other and isolated from the other elements of the transformer, which reduces the risk of occurrence of eddy currents and short circuits. The elastic plate 29 reduces the effects of shocks such as earthquakes.
La plaque d'appui 24 est avantageusement isolante elle aussi, par exemple en bakélite ou en carton bakélisé. Sa forme est avantageusement non circulaire, par exemple comme on le voit à la figure 1, en triangle à sommets coupés, donc plus étendue à l'endroit des ensembles de bobinage 11, 12 et 13 afin de couvrir leur plus grande partie tout en ayant une superficie modérée afin de diminuer son coût. Elle est percée à l'endroit des tubes 4, 5 et 6 avec du jeu. Elle est encore percée au centre (qui coïncide avec le centre du transformateur 7, autour duquel s'ordonnent les câbles 1, 2 et 3 et la plaque d'appui 8 ) ; ce perçage central 30, qui a un diamètre avantageusement égal ou supérieur à 7% de la plus grande dimension, assouplit la plaque de maintien 24 en lui permettant de fléchir et de serrer équitablement les ensembles de bobinages 11, 12 et 13 en acceptant des réglages inégaux des écrous 25 retenant la plaque de maintien 24. The support plate 24 is advantageously also insulating, for example bakelite or bakelized cardboard. Its shape is advantageously non-circular, for example as seen in FIG. 1, in a triangle with cut vertices, and therefore more extended at the location of the winding assemblies 11, 12 and 13 in order to cover most of them while having a moderate area to reduce its cost. It is pierced at the place of the tubes 4, 5 and 6 with play. It is still drilled in the center (which coincides with the center of the transformer 7, around which are arranged the cables 1, 2 and 3 and the plate of support 8); this central bore 30, which has a diameter advantageously equal to or greater than 7% of the largest dimension, relaxes the holding plate 24 by allowing it to flex and clamp the sets of windings 11, 12 and 13 evenly by accepting settings unequal nuts 25 retaining the holding plate 24.

Claims

REVENDICATIONS
1. Transformateur de courant pour appareillage électrique triphasé, comprenant trois câbles de phase (1, 2, 3), parallèles, trois ensembles de bobinages (11, 12, 13) entourant respectivement les câbles de phase, une plaque d'appui (8) commune aux ensembles de bobinage, et des tirants (20, 21, 22) de maintien des ensembles de bobinages qui sont liés à la plaque d'appui, caractérisé en ce qu'il comprend une plaque de maintien (24) commune aux ensembles de bobinage (11, 12, 13), qui sont retenus entre ladite plaque de maintien (24) et ladite plaque d'appui (8), et à laquelle les tirants (20, 21, 22) sont aussi liés, les tirants étant en nombre inférieur à neuf. 1. Current transformer for three-phase electrical equipment, comprising three phase cables (1, 2, 3), parallel, three sets of windings (11, 12, 13) respectively surrounding the phase cables, a support plate (8). ) common to the winding assemblies, and tie rods (20, 21, 22) for holding the winding assemblies which are connected to the support plate, characterized in that it comprises a holding plate (24) common to the assemblies winding (11, 12, 13), which are retained between said holding plate (24) and said bearing plate (8), and to which the tie rods (20, 21, 22) are also connected, the tie rods being in number less than nine.
2. Transformateur de courant suivant la revendication 1, caractérisé en ce que les tirants (20, 21, 22) sont au nombre de trois et disposés chacun entre deux des ensembles de bobinages, sur des cercles concentriques à la plaque d'appui (8) ou à la plaque de maintien (24). 2. current transformer according to claim 1, characterized in that the tie rods (20, 21, 22) are three in number and each disposed between two sets of windings on concentric circles to the support plate (8). ) or the holding plate (24).
3. Transformateur de courant suivant l'une quelconque des revendications 1 ou 2, caractérisé en ce que la plaque de maintien (24) est isolante de l'électricité. 3. Current transformer according to any one of claims 1 or 2, characterized in that the holding plate (24) is insulating electricity.
4. Transformateur de courant suivant la revendication 3, caractérisé en ce que la plaque de maintien est, au moins partiellement, en bakélite. 4. Current transformer according to claim 3, characterized in that the holding plate is at least partially Bakelite.
5. Transformateur de courant suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que des plaquettes (26, 27, 28) isolantes de l'électricité s'étendent entre les bobinages (14, 15, 16) pour chacun des ensembles de bobinages, et entre les ensembles de bobinages (11, 12, 13) et la plaque d ' appui ( 8 ) . 5. Current transformer according to any one of claims 1 to 4, characterized in that electrically insulating plates (26, 27, 28) extend between the windings (14, 15, 16) for each of the winding assemblies, and between the winding assemblies (11, 12, 13) and the bearing plate (8).
6. Transformateur de courant suivant l'une quelconque des revendications 1 à 5, caractérisé en ce que la plaque de maintien est non circulaire. 6. current transformer according to any one of claims 1 to 5, characterized in that the holding plate is non-circular.
7. Transformateur de courant suivant la revendication 6, caractérisé en ce que la plaque de maintien est triangulaire à sommets coupés. 7. Current transformer according to claim 6, characterized in that the holding plate is triangular cut off vertices.
8. Transformateur de courant suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que la plaque de maintien comprend un perçage (30) central . 8. Current transformer according to any one of claims 1 to 7, characterized in that the holding plate comprises a central bore (30).
9. Transformateur de courant suivant l'une quelconque des revendications 1 à 8, caractérisé en ce qu'il comprend une plaque élastique (29) entre les ensembles de bobinages (11, 12, 13) et la plaque de maintien (24). 9. current transformer according to any one of claims 1 to 8, characterized in that it comprises a resilient plate (29) between the sets of windings (11, 12, 13) and the holding plate (24).
10. Transformateur de courant suivant l'une quelconque des revendications 1 à 9, caractérisé en ce que la plaque de maintien (24) est apte à fléchir pour serrer les ensembles de bobinages (11, 12, 13) . Current transformer according to one of Claims 1 to 9, characterized in that the holding plate (24) is flexable to clamp the winding assemblies (11, 12, 13).
11. Transformateur de courant suivant la revendication 10, caractérisé en ce que les tirants sont formés de tiges filetées (23) munies d'écrous (25) réglables de retenue de la plaque de maintien (24) . 11. Current transformer according to claim 10, characterized in that the tie rods are formed of threaded rods (23) provided with adjustable nuts (25) for retaining the holding plate (24).
12. Appareillage électrique comprenant le transformateur de courant suivant l'une quelconque des revendications précédentes. Electrical apparatus comprising the current transformer according to any one of the preceding claims.
13. Appareillage électrique suivant la revendication 12, caractérisé en ce que le transformateur est à atmosphère d'air et les câbles de phase, enfermés dans des tubes, sont à atmosphère gazeuse autre que d'air. 13. Electrical apparatus according to claim 12, characterized in that the transformer is in an air atmosphere and the phase cables, enclosed in tubes, are in a gas atmosphere other than air.
PCT/EP2012/054988 2011-03-25 2012-03-21 Current transformer for three-phase equipment WO2012130687A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1152508A FR2973154B1 (en) 2011-03-25 2011-03-25 CURRENT TRANSFORMER FOR THREE-PHASE EQUIPMENT
FR1152508 2011-03-25

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WO2012130687A1 true WO2012130687A1 (en) 2012-10-04

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WO (1) WO2012130687A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN106024300A (en) * 2016-06-27 2016-10-12 国网江苏省电力公司盐城供电公司 Zero sequence current transformer capable of preventing cable from loosening

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DE2325451A1 (en) 1973-05-17 1974-11-21 Siemens Ag MEASURING CONVERTER FOR A MULTIPLE CONDUCTOR HIGH-VOLTAGE SWITCHGEAR
FR2230051A1 (en) 1973-05-17 1974-12-13 Siemens Ag
US3942106A (en) 1973-05-17 1976-03-02 Siemens Aktiengesellschaft Voltage transformer for use in high voltage switching installation
CH614554A5 (en) 1976-07-02 1979-11-30 Asea Ab
US4338657A (en) 1974-05-21 1982-07-06 Lisin Vladimir N High-voltage transformer-rectifier device
JPS6167209A (en) * 1984-09-10 1986-04-07 Toshiba Corp Duct spacer for foil-wound transformer
EP0229220A1 (en) 1985-10-09 1987-07-22 Sprecher Energie AG Current transformer
US5367432A (en) 1992-03-17 1994-11-22 Hitachi, Ltd. Instrument current transformer for power cables

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Publication number Priority date Publication date Assignee Title
DE2325443A1 (en) * 1973-05-17 1974-11-21 Siemens Ag VOLTAGE CONVERTER FOR A MULTIPLE LADDER HIGH VOLTAGE SWITCHGEAR
DE2325451A1 (en) 1973-05-17 1974-11-21 Siemens Ag MEASURING CONVERTER FOR A MULTIPLE CONDUCTOR HIGH-VOLTAGE SWITCHGEAR
FR2230051A1 (en) 1973-05-17 1974-12-13 Siemens Ag
FR2230049A1 (en) 1973-05-17 1974-12-13 Siemens Ag
US3942106A (en) 1973-05-17 1976-03-02 Siemens Aktiengesellschaft Voltage transformer for use in high voltage switching installation
US4338657A (en) 1974-05-21 1982-07-06 Lisin Vladimir N High-voltage transformer-rectifier device
CH614554A5 (en) 1976-07-02 1979-11-30 Asea Ab
JPS6167209A (en) * 1984-09-10 1986-04-07 Toshiba Corp Duct spacer for foil-wound transformer
EP0229220A1 (en) 1985-10-09 1987-07-22 Sprecher Energie AG Current transformer
US5367432A (en) 1992-03-17 1994-11-22 Hitachi, Ltd. Instrument current transformer for power cables

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106024300A (en) * 2016-06-27 2016-10-12 国网江苏省电力公司盐城供电公司 Zero sequence current transformer capable of preventing cable from loosening

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FR2973154B1 (en) 2017-07-14

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