EP2289080B1 - Transformateur blindé optimisé, notamment pour réaliser des essais diélectriques - Google Patents

Transformateur blindé optimisé, notamment pour réaliser des essais diélectriques Download PDF

Info

Publication number
EP2289080B1
EP2289080B1 EP09754361.5A EP09754361A EP2289080B1 EP 2289080 B1 EP2289080 B1 EP 2289080B1 EP 09754361 A EP09754361 A EP 09754361A EP 2289080 B1 EP2289080 B1 EP 2289080B1
Authority
EP
European Patent Office
Prior art keywords
transformer
primary winding
layers
facing
shaped screen
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.)
Active
Application number
EP09754361.5A
Other languages
German (de)
English (en)
Other versions
EP2289080A1 (fr
Inventor
Claudio Ceretta
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sea Elettromeccanica Arzignanese SpA Soc
Original Assignee
Sea Elettromeccanica Arzignanese SpA Soc
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 Sea Elettromeccanica Arzignanese SpA Soc filed Critical Sea Elettromeccanica Arzignanese SpA Soc
Publication of EP2289080A1 publication Critical patent/EP2289080A1/fr
Application granted granted Critical
Publication of EP2289080B1 publication Critical patent/EP2289080B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/321—Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/288—Shielding
    • H01F27/2885—Shielding with shields or electrodes
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/10—Single-phase transformers

Definitions

  • the present invention relates to an optimized shielding transformer, in particular for carrying out dielectric tests.
  • a transformer is a static machine operating in alternating current suitable to convert the parameters of output voltage and electric current with reference to those input ones while keeping a high efficiency.
  • the single-phase transformer includes two or more inductor circuits, called primary winding and secondary winding, coupled each other through a common magnetic flux, which varies over time, supplied by a high permeability magnetic circuit, called ferromagnetic core.
  • the primary winding and the secondary winding are also called in technical jargon high voltage winding and low voltage winding respectively.
  • a first winding usually the primary one, receives power at a given value of voltage and frequency from an electrical energy source, such as for example the electric network, while the second winding, usually the secondary one, provides power to a user load at the same frequency value and at a voltage value usually different from that one which supplies the first winding.
  • the ferromagnetic core is composed of a series of shaped laminations, packed together, and, in general, presents a so-called “columns” or "shell” type shape.
  • the section of these columns can be rectangular, square or joggled, in relation to the operating voltages and the chosen power of the transformer.
  • the junction between columns and yokes constitutes a magnetic gap whose thickness must be reduced in order to minimize the reluctance of the magnetic circuit.
  • the coils forming the primary winding and the coils forming the secondary winding have different diameters; in the alternate lay-out, the coils forming the primary winding and the coils forming the secondary winding have the same diameter and are mounted one intercalated the other.
  • the primary winding and the secondary winding are properly insulated each other, in case of concentric lay-out for example by a tubular cylinder made of high dielectric strength material, such as prestressed paper-based material, or by a screen composed of a series of cylinders made of carton and overlapped each other.
  • the transformer also provides appropriate channels among the windings, suitable to facilitate the passage of a refrigerant fluid, for example mineral oil or air in natural or forced ventilation, in order to dispose the power dissipated both in the ferromagnetic core, due to hysteresis and parasitic currents, and in the windings due to Joule effect.
  • a refrigerant fluid for example mineral oil or air in natural or forced ventilation
  • the transformer includes a containment case, made of metallic material, especially for outside installations, or insulating material, and an expansion reservoir of the refrigerant fluid, commonly called conservator.
  • the member organs described above, such as the magnetic core, the windings and the core clamps are placed inside the containment case, while the conservator is externally coupled with the containment case.
  • a transformer for dielectric tests provides the application of a prefixed voltage at industrial frequencies for a given time interval, in order to determine for an electrical apparatus, usually another transformer, the insulation of the windings towards the other parts.
  • transformers with insulation class up to 130 kV, up to 170 kV, up to 400 kV and so forth.
  • the transformer supplies an electric current only to feed its own capacities and those ones of the test apparatus, included between fractions of amperes and 1/2 amperes.
  • the present invention relates to transformers, in particular for carrying out dielectric tests, provided with the so-called “cigar” winding, made of several layers facing each other whose height gradually decreases, according to a predetermined rule, starting from the column on which the winding is wound towards the containment case, in direction orthogonal to the column itself.
  • Said transformers are known for example from US3675175A , EP190930A and WO2006/103193A .
  • this type of construction of the transformer allows a better use of the space available inside the windings and favours the limitation of the overall sizes of the containment case.
  • the present invention intends to overcome the drawbacks of the prior art just mentioned.
  • the present invention to develop an optimized shielding transformer, in particular for carrying out dielectric tests, which operates a voltage impulses distribution on the sections of at least one of the windings more uniform than the known transformers.
  • the transformer of the invention thanks to the shaped screen having the metallic or metalled outer surface, preserves the integrity status of the windings to a greater extent than the equivalent transformers of the known type.
  • the shaped screen In case of transformers with winding consisting of more layers, the shaped screen, after all, allows to configure the winding itself as a capacitive potential divider in which two mutually adjacent and facing layers form a condenser.
  • the metallic and equipotential outer surface of the shaped screen does not give constraints to the connection of the insulator, another classic component of a transformer, thus simplifying the fitting operations and the constructive choices.
  • the shaped screen belonging to the transformer of the invention removes the need, which can be found, instead, in the current technology, to isolate the last layer of the primary winding.
  • the single-phase optimized shielding transformer of the invention is shown sectioned in figures 1 and 2 , where it is globally indicated with 1.
  • the optimized shielding transformer 1 comprises:
  • the transformer 1 comprises a shaped screen, as a whole indicated with 8, facing the primary winding 4 and provided with a metallic outer surface 8a which, in case of need, splits up in a uniform and capacitive way on the primary winding 4 a possible voltage impulse which succeeds to hit the shaped screen 8.
  • the shaped screen 8 includes a metalled coating 9, coupled with the main core 10 of the shaped screen 8 itself through junction means, not represented and of the type in itself known to the person skilled in the art.
  • the metalled coating 9, thus, constitutes the metallic outer surface 8a, making it equipotential.
  • the shaped screen 8 is also provided with a first curved and convex end 8b and in longitudinal section presents a substantially rectangular shape profile which defines a longitudinal direction Y 1 .
  • the containment case 2 is of the type in itself known in the field in question, for example made of metallic material.
  • the magnetic core 3 presents shape and composition of the type in itself known in the electrotechnical industry: in particular, the magnetic core 3 is of the so-called column type and is formed by a plurality of laminations packed each other.
  • the magnetic core 3 has in longitudinal section a rectangular profile, comprising two opposite columns 31, 32, on the second of which the windings 4 and 6 are arranged, the columns 31, 32 being reciprocally connected by two yokes 33, 34 which are compressed through core clamps 11, 12 made of metallic material, one of which connected with the containment case 2 through anchorage means, overall indicated with 13 and the other one constrained to a reference plane 14 of the case 2.
  • Figures 1 and 2 show moreover some of the other traditional member organs of a transformer, in particular for carrying out dielectric tests, also provided by the optimized transformer 1 of the invention, such as the high voltage insulators 15 connected with the primary winding 4, the low voltage insulators 16 connected with the secondary winding 6.
  • the primary winding 4 comprises a plurality of layers 18 facing each other, defining linear directions Y substantially parallel each other and to the longitudinal direction Y 1 of the shaped screen 8.
  • Each of the layers 18 includes in turn a plurality of elementary coils one independent from another, electrically connected each other.
  • the primary winding 4 comprises four layers 18 facing each other.
  • the optimized shielding transformer 1 includes a plurality of spacer gates 21, better highlighted in figure 3 , which separate one from another the coils in each of the layers 18.
  • the secondary or low voltage winding 6 is, instead, divided into two secondary sub-windings 19, 20 of the conductive sheets type, each side-by-side to the other along a direction parallel to the longitudinal direction Y 1 and both wound on the column 32 of the magnetic core 3.
  • the number of layers present in the primary winding might be different from that one indicated above, depending on design choices and voltage values to be achieved.
  • the windings 4 and 6 are magnetically coupled with the column 32 of the magnetic core 3, with the primary winding 4 which surrounds the secondary winding 6 through the interposition of said low voltage insulators 16 and, consequently, the column 32 of the magnetic core 3 in respect of which it is coaxial.
  • linear directions Y defined by the various layers 18 of the primary winding 4 are parallel not only between themselves but also to the columns 31 and 32 of the magnetic core 3.
  • each of the layers 18 decreases in gradual and prearranged way, on the basis of the constructive choices, starting from the column 32 of the magnetic core 3 and according to a longitudinal direction X orthogonal to the linear directions Y defined by the layers 18.
  • the last coil of a layer 18 is electrically connected with the first coil of the immediately following layer 18 through an intermediate connecting terminal 22 which splits up the voltage in order to avoid peaks thereof.
  • the last coil A of the first layer 18 is connected with the first coil B of the second adjacent layer 18, the last coil B of the second layer 18 is connected with the first coil C of the third layer 18 and the last coil C of the third layer 18 is connected with the first coil D of the fourth layer 18.
  • the intermediate connecting terminal 22 has a substantially semi-elliptical shape profile 22' which includes a flat surface 22a facing the coils of two layers 18 contiguous and consecutive each other, as it can be seen for example in figure 4 for the coils marked with C and the coils marked with D.
  • the intermediate connecting terminal 22 also includes a metalled coating 23, for example a laminar paper, suitable to make equipotential the outer wall 22b of the intermediate connecting terminal 22.
  • the optimized shielding transformer 1 also comprises:
  • the low voltage terminal 24 and the full voltage terminal 25 are interposed between one of the layers 18 and one of the core clamps 11, 12.
  • the low voltage terminal 24 and the full voltage terminal 25 include a metalled coating 26 which makes them equipotential.
  • the shaped screen 8 presents:
  • the optimized shielding transformer 1 includes, moreover, a plurality of insulating elements 27 suitable to limit the electric field in the containment case 2.
  • These insulating elements 27 are arranged alongside each other between one layer 18 and the other of the primary winding 4, between the secondary winding 6 and the highest height layer 18 of the primary winding 4.
  • the insulating elements 27 are located, in preferred but not binding way, between the first side face 8d of the shaped screen 8 and the lowest height layer 18 of the primary winding 4, as well as between the second side face 8e of the shaped screen 8 and the containment case 2.
  • Each of the insulating element 27 includes a laminar cylinder made of cardboard, paper or other suitable cellulosed-based material, sized so as to endure the mechanical and electrical stresses to which the optimized shielding transformer 1 is subjected.
  • the transformer 1 comprises a pressing ring 28 positioned close to the low voltage terminal 24 and interposed between the latter and the core clamp 11.
  • Such a pressing ring 28 performs also the function of laterally protecting the primary winding 4 at the first layer 18.
  • the optimized shielding transformer 1 includes a series of piles 29 of pressing rings 30, interposed between each of the core clamps 11, 12 and the primary winding 4 and positioned close to the intermediate connecting terminals 22 and the full voltage terminal 25.
  • the height of these piles 29 increases gradually as the height of the layers 18 of the primary winding 4 decreases along the longitudinal direction X and, therefore, as the lateral distance between the primary winding 4 and the core clamps 11, 12 increases.
  • the height of the pile 29 is inversely proportional to the height of the layers 18 of the primary winding 4.
  • the height of the pile 29 is, therefore, directly proportional to the voltage produced in the primary winding 4 passing from the first layer 18, near the magnetic core 3, to the fourth layer 18, that one farthest from the magnetic core 3.
  • the pressing rings 30 belonging to the same pile 29 has variable thickness: in any case, the pressing rings 30 of smallest thickness are arranged in the vicinity of the intermediate connecting terminals 22 and the full voltage terminal 25.
  • the optimized shielding transformer 1 comprises shielding means, indicated as a whole with 35, interposed among some insulating elements 27 and among some pressing rings 30 in correspondence of the intermediate terminals 22 and the full voltage terminal 25.
  • the shielding means 35 increase the protection of the primary winding 4 against possible electrical discharges, voltage drops, overvoltages and so on since they create among the insulating elements 27 channels which compel such anomalous effects in order to make a forced and tortuous path which causes their dissipation, actually preventing that they reach the primary winding 4.
  • the shielding means 35 comprise, preferably but not necessarily, a plurality of laminar rings 36 and a plurality of laminar caps 37 opposite and facing the laminar rings 36.
  • Each of the laminar rings 36 and each of the laminar caps 37 present, preferably, a substantially L-shaped profile.
  • both the laminar rings 36 and the laminar caps 37 are made of cardboard, paper or other material derived from cellulose.
  • the functioning of the single-phase optimized shielding transformer 1 of the invention is essentially equivalent to that one of the common transformers currently available on the market.
  • One of the main innovations of the optimized shielding transformer 1 is, then, represented by the arrangement of the shaped screen 8 suitable to split up in a uniform manner on the various layers 18 of the primary winding 4 a possible voltage impulse, thus limiting the likely adverse effects on the structural integrity of the winding 4 itself.
  • the containment case could have any size, as well as being made of any of the materials traditionally used for a transformer in the electrotechnic field.
  • the optimized shielding transformer includes more then one shaped screen facing one of the windings.
  • such a shaped screen could be positioned directly close to the winding, whether primary or secondary, without interposing the insulating elements previously indicated for the preferred embodiment of the invention described in the present patent text.

Claims (19)

  1. Transformateur à blindage optimisé (1), en particulier pour l'exécution de tests diélectriques, comprenant
    - un boîtier de confinement (2) approprié pour être placé sur une structure de support,
    - au moins un noyau magnétique (3) placé à l'intérieur dudit boîtier de confinement (2),
    - au moins un enroulement primaire (4) couplé audit noyau magnétique (3),
    - au moins un enroulement secondaire (6) couplé magnétiquement audit enroulement primaire (4) par l'intermédiaire dudit noyau magnétique (3),
    dans lequel au moins ledit enroulement primaire (4) comporte une pluralité de couches (18) adjacentes et en regard les unes des autres,
    caractérisé en ce qu'il comprend au moins un blindage profilé (8), disposé entre ledit enroulement primaire (4) et la sortie (5) dudit boîtier de confinement (2) de façon à faire face audit enroulement primaire (4), et pourvu d'une surface extérieure métallique (8a) appropriée pour configurer ledit enroulement primaire (4) sous la forme d'un diviseur de potentiel capacitif dans lequel deux desdites couches (18) mutuellement adjacentes et en regard forment un condensateur afin de diviser d'une manière uniforme et capacitive sur lesdites couches (18) dudit enroulement primaire (4) une impulsion de tension qui vient frapper ledit blindage profilé (8).
  2. Transformateur (1) selon la revendication 1, caractérisé en ce que ledit blindage profilé (8) comprend au moins un revêtement métallisé (9), couplé par des moyens de jonction à une âme principale (10) dudit blindage profilé (8), appropriée pour constituer une surface extérieure métallique (8a) le rendant équipotentiel.
  3. Transformateur (1) selon la revendication 1 ou 2, caractérisé en ce que ledit blindage profilé (8) est pourvu d'au moins une première extrémité courbe et convexe (8b), et présente, en section longitudinale, un profil de forme essentiellement rectangulaire qui définit une direction longitudinale (Y1).
  4. Transformateur (1) selon la revendication 3, caractérisé en ce qu'au moins l'un entre ledit enroulement primaire (4) et ledit enroulement secondaire (6) comprend deux couches (18) ou plus en regard les unes des autres, définissant des directions linéaires (Y) essentiellement parallèles entre elles et à ladite direction longitudinale (Y1) dudit blindage profilé (8), chacune desdites couches (18) comportant une pluralité de bobines élémentaires indépendantes les unes des autres, connectées électriquement entre elles.
  5. Transformateur (1) selon la revendication 4, caractérisé en ce que ledit enroulement primaire (4) comporte deux couches (18) ou plus en regard les unes des autres.
  6. Transformateur (1) selon la revendication 4, caractérisé en ce que ledit enroulement secondaire (6) comporte deux couches ou plus en regard les unes des autres.
  7. Transformateur (1) selon la revendication 4, caractérisé en ce que ledit enroulement primaire (4) et ledit enroulement secondaire (6) comprennent chacun deux couches ou plus en regard les unes des autres.
  8. Transformateur (1) selon la revendication 4, caractérisé en ce que lesdites bobines comprennent le même nombre de spires, chacune d'elles étant appropriée pour produire une tension de 20 kV.
  9. Transformateur (1) selon la revendication 4 ou 8, caractérisé en ce que lesdites bobines sont connectées les unes aux autres en série et disposées à la suite les unes aux autres.
  10. Transformateur (1) selon la revendication 4 ou 8, caractérisé en ce qu'il comprend une pluralité de grilles d'espacement (21) qui séparent lesdites bobines les unes des autres dans chacune desdites couches (18).
  11. Transformateur (1) selon la revendication 4, caractérisé en ce que ledit noyau magnétique (3) est du type à colonnes et lesdits enroulements (4, 6) sont concentriques et disposés symétriquement par rapport à l'axe central défini par l'une desdites colonnes (31, 32) dudit noyau magnétique (3) auquel ils sont couplés magnétiquement, ledit enroulement primaire (4) étant coaxial et externe audit enroulement secondaire (6).
  12. Transformateur (1) selon la revendication 11, caractérisé en ce que la hauteur de chacune desdites couches (18) desdits enroulements (4, 6) diminue de manière progressive et prédéterminée à partir de ladite colonne (32) dudit noyau magnétique (3) selon une direction longitudinale (X) orthogonale auxdites directions linéaires (Y) définies par lesdites couches (18).
  13. Transformateur (1) selon la revendication 11, caractérisé en ce que les dernières bobines d'une couche (18) sont connectées électriquement à la première bobine de la couche suivante (18) par l'intermédiaire d'une borne de connexion intermédiaire (22), appropriée pour diviser la tension, en regard des extrémités de chacune desdites couches (18) de façon à s'interposer entre chacune desdites couches (18) et une paire de pinces de serrage de noyau en regard l'une de l'autre (11, 12) positionnée à l'intérieur dudit boîtier de confinement (2).
  14. Transformateur (1) selon la revendication 13, caractérisé en ce que ladite borne intermédiaire (22) comporte un revêtement métallisé (23) approprié pour rendre équipotentielle la paroi externe (22b) de ladite borne intermédiaire (22).
  15. Transformateur (1) selon la revendication 13, caractérisé en ce que ladite borne intermédiaire (22) a un profil de forme essentiellement semi-elliptique (22') qui comporte une surface plane (22a) faisant face auxdites bobines de deux desdites couches (18) contiguës entre elles.
  16. Transformateur (1) selon la revendication 13, caractérisé en ce qu'il comprend :
    - une borne basse tension (24), appropriée pour diviser la tension, faisant face à une extrémité de la première bobine de la couche de plus grande hauteur (18) la plus proche de ladite colonne (32) dudit noyau magnétique (3),
    - une borne pleine tension (25), appropriée pour diviser la tension, faisant face à une extrémité de la dernière bobine de la couche de plus petite hauteur (18) la plus éloignée de ladite colonne (32) dudit noyau magnétique (3),
    lesdites bornes basse tension (24) et pleine tension (25) étant interposées entre ladite couche (18) et l'une desdites pinces de serrage de noyau (11, 12).
  17. Transformateur (1) selon la revendication 16, caractérisé en ce que ledit blindage profilé (8) est situé entre ledit boîtier de confinement (2) et ladite couche de plus petite hauteur (18) dudit enroulement primaire (4) et a une hauteur essentiellement égale à celle de ladite couche de plus petite hauteur (18).
  18. Transformateur (1) selon la revendication 16, caractérisé en ce que ledit blindage profilé (8) présente :
    - une deuxième extrémité (8c), opposée à ladite première extrémité (8b), directement en regard du bas (25a) de ladite borne pleine tension (25),
    - une première face latérale plate (8d) orientée vers ledit enroulement primaire (4),
    - une deuxième face latérale plate (8e) orientée vers ledit boîtier de confinement (2), séparée de ladite première face (8d) par une extension linéaire.
  19. Transformateur (1) selon la revendication 18, caractérisé en ce qu'il comprend une pluralité d'éléments isolants (27) appropriés pour limiter le champ électrique à l'intérieur dudit boîtier de confinement (2), placés en regard les uns des autres entre
    - une couche (18) et l'autre dudit enroulement primaire (4),
    - ledit enroulement secondaire (6) et ladite couche de plus grande hauteur (18) dudit enroulement primaire (4),
    - ladite première face (8d) dudit blindage profilé (8) et ladite couche de plus petite hauteur (18) dudit enroulement primaire (4),
    - ladite deuxième face (8e) dudit blindage profilé (8) et ledit boîtier de confinement (2).
EP09754361.5A 2008-05-28 2009-04-30 Transformateur blindé optimisé, notamment pour réaliser des essais diélectriques Active EP2289080B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000124A ITVI20080124A1 (it) 2008-05-28 2008-05-28 Trasformatore a schermatura ottimizzata, in particolare per l'esecuzione di prove dielettriche.
PCT/IT2009/000199 WO2009144759A1 (fr) 2008-05-28 2009-04-30 Transformateur blindé optimisé, notamment pour réaliser des essais diélectriques

Publications (2)

Publication Number Publication Date
EP2289080A1 EP2289080A1 (fr) 2011-03-02
EP2289080B1 true EP2289080B1 (fr) 2015-02-25

Family

ID=40303237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09754361.5A Active EP2289080B1 (fr) 2008-05-28 2009-04-30 Transformateur blindé optimisé, notamment pour réaliser des essais diélectriques

Country Status (3)

Country Link
EP (1) EP2289080B1 (fr)
IT (1) ITVI20080124A1 (fr)
WO (1) WO2009144759A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB877765A (en) * 1957-05-29 1961-09-20 Smit & Willem & Co Nv Improvements in and relating to transformers and choking coils
GB1156369A (en) * 1966-04-08 1969-06-25 Gen Electric Coated Electrostatic Shields for Electrical Apparatus
US3675175A (en) * 1971-05-10 1972-07-04 Gen Electric High voltage coil assembly for electric induction apparatus
KR860006852A (ko) * 1985-02-06 1986-09-15 둘루데 도날드 오 토로이달 트랜스포머용 과도전압 보호장치 및 방법
DE19809572C2 (de) * 1998-03-05 2000-06-21 Siemens Ag Gießharz-Transformator
DE102005015785A1 (de) * 2005-04-01 2006-11-16 Siemens Ag Transformator mit elektrischer Abschirmung

Also Published As

Publication number Publication date
EP2289080A1 (fr) 2011-03-02
WO2009144759A1 (fr) 2009-12-03
ITVI20080124A1 (it) 2009-11-29

Similar Documents

Publication Publication Date Title
CN103069515A (zh) 在绕组中具有屏蔽环的变压器
Del Vecchio et al. Transformer design principles
EP1831902B1 (fr) Dispositif d'induction electrique pour des applications a tension elevee
EP2787515B1 (fr) Élément d'espacement à intervalle d'inducteur
EP3018665A1 (fr) Bobine à faible capacité inter-enroulements
US9583252B2 (en) Transformer
EP2289080B1 (fr) Transformateur blindé optimisé, notamment pour réaliser des essais diélectriques
KR102618677B1 (ko) 권선을 포함하는 변압기
JP7029920B2 (ja) 変圧器
EP2272073B1 (fr) Transformateur optimisé, en particulier pour réaliser des essais diélectriques
JP2018113325A (ja) 静止誘導器
EP3544033B1 (fr) Dispositif à induction électromagnétique possédant un enroulement à pertes faibles
WO2021130819A1 (fr) Bobine d'induction statique
EP2565884B1 (fr) Bobine haute tension
KR102135202B1 (ko) 변압기
EP2573781B1 (fr) Bobine à haute tension
JPH0311534B2 (fr)
EP3349225B1 (fr) Noyau pour un réacteur shunt électrique
US20170117088A1 (en) Impulse voltage-resistant disc-wound transformer
KR101220110B1 (ko) 비정질 마그네틱 코어를 이용한 고출력 펄스 전압 발생 장치 및 비정질 마그네틱 코어의 제조 방법
JP4867053B2 (ja) リアクトル
US11282635B2 (en) Stationary induction electric apparatus
KR101631182B1 (ko) 고점적율 변압기
Chaw et al. Design comparison for rectangular and round winding distribution transformer (1000 kVA)
JP3522290B2 (ja) 円板巻線

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20101125

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA RS

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20140115

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602009029565

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: H01F0027000000

Ipc: H01F0027320000

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: H01F 27/36 20060101ALI20140902BHEP

Ipc: H01F 30/10 20060101ALI20140902BHEP

Ipc: H01F 27/32 20060101AFI20140902BHEP

Ipc: H01F 27/28 20060101ALI20140902BHEP

INTG Intention to grant announced

Effective date: 20140915

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602009029565

Country of ref document: DE

Effective date: 20150409

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 712588

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150415

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20150225

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 712588

Country of ref document: AT

Kind code of ref document: T

Effective date: 20150225

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150525

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150625

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150526

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602009029565

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150430

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20150525

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150430

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150430

26N No opposition filed

Effective date: 20151126

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150430

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20150525

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20090430

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150625

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20150225

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20200312

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: TR

Payment date: 20200430

Year of fee payment: 12

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210430

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230503

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20230405

Year of fee payment: 15

Ref country code: DE

Payment date: 20230307

Year of fee payment: 15