EP2289080B1 - Transformator mit einer optimierte abschirmung, insbesondere zur durchführung von dielektrischer tests - Google Patents

Transformator mit einer optimierte abschirmung, insbesondere zur durchführung von dielektrischer tests Download PDF

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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
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Prior art keywords
transformer
primary winding
layers
facing
shaped screen
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English (en)
French (fr)
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EP2289080A1 (de
Inventor
Claudio Ceretta
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Sea Elettromeccanica Arzignanese SpA Soc
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Sea Elettromeccanica Arzignanese SpA Soc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—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.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Testing Relating To Insulation (AREA)

Claims (19)

  1. Transformator (1) mit einer optimierten Abschirmung, insbesondere zum Durchführen von dielektrischen Tests, umfassend
    - ein Sicherheitsgehäuse (2), das geeignet ist, um auf einer Stützstruktur angeordnet zu werden,
    - mindestens einen magnetischen Kern (3), der innerhalb des Sicherheitsgehäuses (2) angeordnet ist,
    - mindestens eine Primärwicklung (4), die mit dem magnetischen Kern (3) gekoppelt ist,
    - mindestens eine Sekundärwicklung (6), die durch den magnetischen Kern (3) magnetisch mit der Primärwicklung (4) gekoppelt ist,
    wobei zumindest die Primärwicklung (4) eine Vielzahl von Lagen (18) enthält, die benachbart und einander zugewandt sind, dadurch gekennzeichnet, dass er mindestens einen geformten Schirm (8) aufweist, der zwischen der Primärwicklung (4) und dem Ausgang (5) des Sicherheitsgehäuses (2) angeordnet, sodass er der Primärwicklung (4) zugewandt ist und der mit einer metallischen Außenfläche (8a) versehen ist, die geeignet ist, um die Primärwicklung (4) als kapazitiver Spannungsteiler zu konfigurieren, indem zwei der Lagen (18) die benachbart und einander zugewandt sind, einen Kondensator formen, um auf den Lagen (18) der Primärwicklung (4) auf einheitliche und kapazitive Art einen Spannungsimpuls aufzuteilen, der den geformten Schirm (8) trifft.
  2. Transformator (1), wie in Anspruch 1 beansprucht, dadurch gekennzeichnet, dass der geformte Schirm (8) mindestens eine metallisierte Beschichtung (9) aufweist, die durch Verbindungsmittel mit einem Hauptkern (10) des geformten Schirms (8) verbunden ist, die geeignet ist, um eine metallische Außenfläche (8a) äquipotenzial zu machen.
  3. Transformator (1), wie in Anspruch 1 oder 2 beansprucht, dadurch gekennzeichnet, dass der geformte Schirm (8) mit mindestens einem gekrümmten und konvexen Ende (8b) versehen ist und in einem Längsschnitt ein im Wesentlichen rechteckig geformtes Profil bietet, das eine Längsrichtung (Y1) definiert.
  4. Transformator (1), wie in Anspruch 3 beansprucht, dadurch gekennzeichnet, dass zumindest eines von der Primärwicklung (4) und der Sekundärwicklung (6) zwei oder mehrere, einander zugewandte Lagen (18) aufweist, die Linearrichtungen (Y) im Wesentlichen parallel zueinander und zu der Längsrichtung (Y1) des geformten Schirms (8) definieren, wobei jede der Lagen (18) eine Vielzahl von Elementarspulen enthält, die jeweils unabhängig voneinander sind, die elektrisch miteinander verbunden sind.
  5. Transformator (1), wie in Anspruch 4 beansprucht, dadurch gekennzeichnet, dass die Primärwicklung (4) zwei oder mehrere Lagen (18) enthält, die einander zugewandt sind.
  6. Transformator (1), wie in Anspruch 4 beansprucht, dadurch gekennzeichnet, dass die Sekundärwicklung (6) zwei oder mehrere Lagen enthält, die einander zugewandt sind.
  7. Transformator (1), wie in Anspruch 4 beansprucht, dadurch gekennzeichnet, dass die Primärwicklung (4) und die Sekundärwicklung (6) jeweils zwei oder mehrere Lagen aufweisen, die einander zugewandt sind.
  8. Transformator (1), wie in Anspruch 4 beansprucht, dadurch gekennzeichnet, dass die Spulen dieselbe Anzahl an Windungen aufweisen, wobei jede geeignet ist, um eine Spannung von 20 kV zu erzeugen.
  9. Transformator (1), wie in Anspruch 4 oder 8 beansprucht, dadurch gekennzeichnet, dass die Spulen wechselseitig in Serie geschaltet und eine nach der anderen angeordnet sind.
  10. Transformator (1), wie in Anspruch 4 oder 8 beansprucht, dadurch gekennzeichnet, dass er eine Vielzahl von Abstandsgattern (21) aufweist, die die Spulen in jeder der Lagen (18) voneinander trennen.
  11. Transformator (1), wie in Anspruch 4 beansprucht, dadurch gekennzeichnet, dass der magnetische Kern (3) vom Säulentyp ist und die Wicklungen (4, 6) konzentrisch und symmetrisch angeordnet sind in Bezug auf die Mittelachse, die durch eine der Säulen (31, 32) des magnetischen Kerns (3) definiert wird, mit dem magnetisch gekoppelt wird, wobei die Primärwicklung (4) koaxial und extern zu der Sekundärwicklung (6) ist.
  12. Transformator (1), wie in Anspruch 11 beansprucht, dadurch gekennzeichnet, dass die Höhe von jeder der Lagen (18) der Wicklungen (4, 6) in gradueller und vorgegebener Weise abnimmt, beginnend von der Säule (32) des magnetischen Kerns (3) gemäß einer Längsrichtung (X) rechtwinklig zu den Linearrichtungen (Y), die von den Lagen (18) definiert werden.
  13. Transformator (1), wie in Anspruch 11 beansprucht, dadurch gekennzeichnet, dass die letzte Spule einer Lage (18) elektrisch mit der ersten Spule der folgenden Lage (18) verbunden ist durch einen dazwischen befindlichen Verbindungsanschluss (22), der geeignet ist, um die Spannung zu teilen, der den Enden von jeder der Lagen (18) zugewandt ist, um zwischen jede der Lagen (18) und ein Paar von Wechselseitig gegenüberliegenden Kernklammern (11, 12) eingesetzt zu sein, die innerhalb des Sicherheitsgehäuses (2) angeordnet sind.
  14. Transformator (1), wie in Anspruch 13 beansprucht, dadurch gekennzeichnet, dass der Zwischenanschluss (22) eine metallische Beschichtung (23) enthält, die geeignet ist, um die Außenwand (22b) des Zwischenanschlusses (22) äquipotenzial zu machen.
  15. Transformator (1), wie in Anspruch 13 beansprucht, dadurch gekennzeichnet, dass der Zwischenanschluss (22) ein im Wesentlichen halb elliptisch geformtes Profil (22') aufweist, das eine flache Oberfläche (22a) enthält, die den Spulen von zwei der Lagen (18) zugewandt ist und benachbart ist.
  16. Transformator (1), wie in Anspruch 13 beansprucht, dadurch gekennzeichnet, dass er aufweist:
    - einen Niederspannungsanschluss (24), der geeignet ist, um die Spannung aufzuteilen, und der ein Ende der ersten Spule der Lage mit der größten Höhe (18) am nächsten zu der Säule (32) des magnetischen Kerns (3) zugewandt ist,
    - einen Vollspannungsanschluss (25), der geeignet ist, um die Spannung aufzuteilen und zugewandt ist zu einem Ende der letzten Spule der Lage (18) mit der geringsten Höhe am weitesten entfernt von der Säule (32) des magnetischen Kerns (3),
    wobei der Niederspannungsanschluss (24) und der Vollspannungsanschluss (25) zwischen die Lage (18) und einer der Kernklammern (11, 12) eingesetzt ist.
  17. Transformator (1), wie in Anspruch 16 beansprucht, dadurch gekennzeichnet, dass der geformte Schirm (8) angeordnet ist zwischen dem Sicherheitsgehäuse (2) und der Lage (18) der Primärwicklung (4) mit der geringsten Höhe und eine Höhe aufweist, die im Wesentlichen gleich derjenigen der Lage (18) mit der geringsten Höhe ist.
  18. Transformator (1), wie in Anspruch 16 beansprucht, dadurch gekennzeichnet, dass der geformte Schirm (8) präsentiert:
    - ein zweites Ende (8c) gegenüber dem ersten Ende (8b), das direkt dem Boden (25a) des Vollspannungsanschlusses (25) zugewandt ist,
    - eine erste flache Seitenfläche (8d), die der Primärwicklung (4) zugewandt orientiert ist,
    - eine zweite flache Seitenfläche (8e), die dem Sicherheitsgehäuse (2) zugewandt orientiert ist und die durch eine lineare Dehnung von der ersten Fläche (8d) getrennt ist.
  19. Transformator (1), wie in Anspruch 18 beansprucht, dadurch gekennzeichnet, dass er eine Vielzahl von Isolierelementen (27) aufweist, die geeignet sind, um das elektrische Feld innerhalb des Sicherheitsgehäuses (2) zu begrenzen, die einander zugewandt angeordnet sind zwischen
    - einer Lage (18) und der anderen der Primärwicklung (4),
    - der Sekundärwicklung (6) und der Lage (18) der Primärwicklung (4) mit der größten Höhe,
    - der ersten Fläche (8d) des geformten Schirms (8) und der Lage (18) der Primärwicklung (4) mit der geringsten Höhe,
    - der zweiten Fläche (8e) des geformten Schirms (8) und dem Sicherheitsgehäuse (2).
EP09754361.5A 2008-05-28 2009-04-30 Transformator mit einer optimierte abschirmung, insbesondere zur durchführung von dielektrischer tests Active EP2289080B1 (de)

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 (en) 2008-05-28 2009-04-30 Optimized shielded transformer, in particular for carrying out dielectric tests

Publications (2)

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

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EP (1) EP2289080B1 (de)
IT (1) ITVI20080124A1 (de)
WO (1) WO2009144759A1 (de)

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

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ITVI20080124A1 (it) 2009-11-29
WO2009144759A1 (en) 2009-12-03

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