EP4687159A1 - Winding arrangement, transformer, and method of manufacturing a winding arrangement of a transformer - Google Patents

Winding arrangement, transformer, and method of manufacturing a winding arrangement of a transformer

Info

Publication number
EP4687159A1
EP4687159A1 EP24382838.1A EP24382838A EP4687159A1 EP 4687159 A1 EP4687159 A1 EP 4687159A1 EP 24382838 A EP24382838 A EP 24382838A EP 4687159 A1 EP4687159 A1 EP 4687159A1
Authority
EP
European Patent Office
Prior art keywords
winding
electric shielding
transformer
shielding element
winding arrangement
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.)
Pending
Application number
EP24382838.1A
Other languages
German (de)
French (fr)
Inventor
Carlos Manuel ROY MARTIN
Rafael MURILLO JASO
Lorena Cebrian Lles
Antonio Nogues Barrieras
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.)
Hitachi Energy Ltd
Original Assignee
Hitachi Energy 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 Hitachi Energy Ltd filed Critical Hitachi Energy Ltd
Priority to EP24382838.1A priority Critical patent/EP4687159A1/en
Priority to PCT/EP2025/069509 priority patent/WO2026027199A1/en
Publication of EP4687159A1 publication Critical patent/EP4687159A1/en
Pending legal-status Critical Current

Links

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
    • H01F27/34—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

Definitions

  • Transformers are widely used to convert electricity from a first voltage level to a second voltage level, the second voltage level being either higher or lower than the first voltage level.
  • the transformer may comprise a winding arrangement which includes one or more windings, e.g., one or more primary windings and one or more secondary windings. One or more of the windings may be connected in series or in parallel.
  • the winding arrangement often includes a shielding element made of an electrically conductive material which at least partially covers one or more of the windings, in particular in order to adapt and/or adjust an electric field generated at the windings.
  • the winding arrangements with a shielding element known from the prior art have several disadvantages.
  • the shielding elements from the prior art often have a relatively complex shape and/or configuration which can make the shielding element relatively difficult, e.g., time-consuming and/or relatively expensive, to manufacture.
  • the winding arrangement may include at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer.
  • the winding may be made of an electrically conductive material.
  • the winding arrangement may include at least one electric shielding element made at least partially of an electrically conductive material.
  • the winding arrangement may include at least one connection element made at least partially of an electrically conductive material.
  • the connection element may electrically connect the electric shielding element with the winding.
  • the connection element may be a cable or a rod or a strip of the electrically conductive material.
  • the electric shielding element may be arranged along a section of a top side or a bottom side of the winding.
  • the electric shielding element may be arranged off-center along the section of the top side or the bottom side, optionally with respect to a centerline, in particular a vertical or substantially vertical centerline, of a cross-sectional area of the winding, and/or with respect to a center or middle of a top side or a bottom side of the cross-sectional area of the winding.
  • the term "vertical” refers to an operable position of the transformer including the winding arrangement.
  • Configuring the winding arrangement with a connection element made at least partially of an electrically conductive material and electrically connecting the electric shielding element with the winding by the connection element may allow the electric shielding element and the connection element to be manufactured separately and/or individually. This may allow the configuration and/or the manufacturing process of the electric shielding element to be tailored to the requirements and/or desired characteristics of the electric shielding element, substantially independently of the connection element.
  • providing an electric shielding element which directly contacts the winding may limit or constrain the configuration and/or the manufacturing process of the electric shielding element and/or may place certain requirements and/or restraints on the configuration and/or the manufacturing process of the electric shielding element which may at least partially be avoided by an electric shielding element which is electrically connected to the winding by a separate connection element according to the present disclosure.
  • the winding arrangement described herein may also simplify the shape and the configuration of the electric shielding element. The same advantages also apply to the connection element.
  • connection element as a cable or a rod or a strip of the electrically conductive material may provide a relatively simple and/or relatively compact means for electrically connecting the electric shielding element with the winding. Moreover, this may provide a relatively reliable means for electrically connecting the electric shielding element with the winding.
  • arranging the electric shielding element off-center may facilitate and/or increase (e.g., compared with an electric shielding element arranged, e.g., on the centerline of the cross-sectional area) the shielding function of the electric shielding element, e.g., by positioning the electric shielding element closer to an edge or corner of the winding and/or by increasing an effectiveness and/or an efficiency of the electric shielding element, in particular with respect to a more efficient position and/or use of a size and/or mass of the electric shielding element compared with the effectiveness of a electric shielding element arranged centrally. In other words, this may increase the effectiveness of the electric shielding element, in particular for a given size and/or mass of the electric shielding element.
  • the winding arrangement may be a winding arrangement of a dry-type transformer.
  • the winding arrangement may be a winding arrangement of a liquid-immersed transformer.
  • the winding may include a plurality of winding portions which each include an electrically conductive material.
  • the winding portions may be electrically interconnected.
  • the winding portions may be arranged and/or interconnected in series or parallel.
  • the winding arrangement may include a plurality of the at least winding, e.g., at least one low-voltage winding and at least one high-voltage winding.
  • the plurality of windings may be arranged radially spaced apart from each other, e.g., a first winding of the plurality of windings may be wound about a second winding of the plurality of windings.
  • top side and bottom side of the winding refer to an operational position of the transformer.
  • the top side and bottom side of the winding may extend perpendicularly or substantially perpendicularly to the winding axis and/or a longitudinal axis of the winding and/or the transformer, when the winding assembly is operably mounted in the transformer.
  • the "top side” of the winding may be a top face or a top end face of the winding.
  • the “bottom side” of the winding may be a bottom face or a bottom end face of the winding.
  • a "cross-sectional area”, according to the present disclosure, means a single coherent, i.e., at least partially interconnected, cross-sectional area of the winding.
  • multiple cross-sectional areas may be present/visible, e.g., at least one cross-sectional area on each side of the winding axis, respectively.
  • each cross-sectional area is considered an individual "cross-sectional area" within the meaning of the present disclosure.
  • the centerline of the cross-sectional area of the winding extends through a center of the cross-sectional area.
  • the centerline may be a symmetry axis of the cross-sectional area.
  • the centerline preferably extends substantially vertically and/or substantially parallel to the winding axis and/or the longitudinal axis of the winding and/or the transformer.
  • the cross-sectional area may be a cross-sectional area in a cross-section of the winding assembly along a plane which extends vertically and/or along and/or substantially parallel to the winding axis and/or the longitudinal axis of the winding and/or the transformer.
  • Off-center means, according to the present disclosure, that the electric shielding element is not aligned with a center of the section of the top side or the bottom side, in particular the mentioned centerline.
  • a center of the electric shielding element is not aligned with a center of the section of the top side or the bottom side, in particular the mentioned centerline, i.e., the center of the section of the top side or the bottom side and/or centerline does not pass through a center of the electric shielding element, when the electric shielding element is arranged "off-center".
  • the electric shielding element is arranged closer to a first lateral side and/or a first edge or corner of the winding, in particular the cross-sectional area, than a second lateral side opposite of the first lateral side and/or a second edge or corner of the winding opposite of the first edge or corner of the winding, in particular the cross-sectional area , when the electric shielding element is arranged "off-center".
  • the winding may be any type of winding used in transformers.
  • the winding may be a helical winding, a foil winding, a disc winding, or any other type of known winding.
  • the electric shielding element may have a cross-sectional area, at at least one cross-section of the electric shielding element, which includes at least one cavity, e.g., in a tube-like manner.
  • the cross-sectional area may be substantially solid, i.e., substantially without any cavities.
  • the electric shielding element is preferably at least partially, preferably completely, made of metal.
  • strip is understood as a relatively long, flat, and narrow element.
  • the "strip" of the electrically conductive material may have a length, which preferably extends between the electric shielding element and the winding, which is greater than a width and/or a thickness of the "strip".
  • the winding arrangement includes at least two, preferably at least three, preferably at least four, of the electric shielding elements.
  • This may further increase the effectiveness and/or efficiency of the electric shielding elements, e.g., by increasing an area covered by the electric shielding elements and/or by allowing a more precise and/or targeted arrangement and/or distribution of the electric shielding elements, and/or may increase a flexibility in configuring, e.g., arranging, e.g., in a certain pattern, and/or manufacturing the electric shielding elements, e.g., by allowing a size of each electric shielding element to be reduced and/or varied, if deemed expedient.
  • the electric shielding elements may be electrically interconnected.
  • the object mentioned at the beginning is also achieved by a winding arrangement of or for a transformer according to a second aspect of the present disclosure.
  • the winding arrangement may include at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer.
  • the winding arrangement may include at least three electric shielding elements made at least partially of an electrically conductive material.
  • the electric shielding elements may be arranged along at least a section of a top side or a bottom side of the winding.
  • the electric shielding elements may be electrically interconnected.
  • the winding arrangement may include at least one connection element which may be made at least partially of an electrically conductive material.
  • the connection element may electrically connect at least one, preferably each, of the electric shielding elements with the winding.
  • the connection element may be a cable or a rod or a strip of the electrically conductive material.
  • any of the features and/or embodiments described herein, e.g., above and/or below, may be implemented in the winding arrangement according to the first aspect of the present disclosure and/or in the winding arrangement according to the second aspect of the present disclosure.
  • the description may refer to "electric shielding element" with respect to one or more features and/or configuration, the respective feature and/or configuration may apply to each electric shielding element, in case the winding arrangement may include multiple electric shielding elements, e.g., such as the winding arrangement according to the second aspect of the present disclosure described above.
  • winding arrangement according to the first aspect of the present disclosure and the winding arrangement according to the second aspect of the present disclosure may be implemented individually/separately. Alternatively, the winding arrangement according to the first aspect of the present disclosure and the winding arrangement according to the second aspect of the present disclosure may be combined.
  • the electric shielding element extends at least partially about the winding axis and/or a longitudinal axis of the transformer, when the winding is operatively arranged in the transformer.
  • the electric shielding element is configured as a ring or semi-ring which extends about the winding axis and/or a longitudinal axis of the transformer. This may provide a shielding function, by means of the electric shielding element, along a relatively large section, e.g., a portion of a circumference, of the winding.
  • the winding axis and/or the longitudinal axis of the winding and/or the transformer may be a center axis of the ring or semi-ring.
  • connection element is connected to the electric shielding element at a connection interface of the ring or semi-ring.
  • the connection interface may extend along no more than 30%, preferably no more 20%, preferably no more than 10%, preferably no more than 5%, of a circumference and/or an extension of the ring or semi-ring around the winding.
  • the connection interface may extend along no more than 80°, preferably no more 70°, preferably no more than 60°, preferably no more than 50°, preferably no more than 40°, preferably no more than 30°, preferably no more than 20°, preferably no more than 10°, of a circumference and/or an extension of the ring or semi-ring around the winding. This may allow the connection element to be relatively compact and/or may facilitate installation, e.g., by allowing a relatively simple connection of the connection element to the electric shielding element.
  • the winding arrangement includes a plurality of the at least one connection element. This may increase a degree of fixation between the winding and the electric shielding element and/or may distribute the connection, e.g., connective forces, between the winding and the electric shielding element over the plurality of connection elements.
  • the plurality of connection elements are spaced apart from each other.
  • the plurality of connection elements are spaced apart from each other:
  • the winding arrangement may include only a single connection element.
  • the electric shielding element extends only partially about the winding axis and/or a longitudinal axis of the transformer, preferably by no more than 270°, preferably no more than 300°, preferably no more than 330°, about the winding axis and/or a longitudinal axis of the winding and/or the transformer.
  • the electric shielding element may extend semi-annularly about the winding axis and/or the longitudinal axis of the winding and/or the transformer.
  • connection element is at least partially flexible and/or compliant and/or bendable. This may facilitate installation of the connection element and/or may allow the connection element to be adjusted more easily and/or to a greater extent.
  • the characteristics "least partially flexible and/or compliant and/or bendable" refer to a state of the connection element before the connection element is mounted and/or potentially fixed, e.g., potentially encased in epoxy resin, in the winding arrangement.
  • connection element is connected to only a section of a circumference or extension, in particular a curved portion of the circumference or extension, of the electric shielding element.
  • connection element is removably connected to the electric shielding element and/or the winding. This may allow the connection element to be removed, and potentially reattached or replaced.
  • the term “removably connected” means that the connection element may be removed without compromising the structural integrity of the connecting element, in particular to such a degree that the connection element could not be reused.
  • the characteristic "removably connected” refers to a state of the connection element before the connection element is mounted and/or potentially fixed, e.g., potentially encased in epoxy resin, in the winding arrangement.
  • the connection element may be removable from the electric shielding element even after the connection element has been mounted and/or potentially fixed, e.g., potentially encased in epoxy resin, in the winding arrangement, e.g., after at least partially removing the epoxy resin.
  • connection element is connected to the electric shielding element at a single point and/or the connection element is connected to the winding at a single point.
  • connection element is connected to the winding at the top side and/or the bottom side and/or a lateral side of the winding, the lateral side preferably connecting the top side and bottom side.
  • the electric shielding element and the winding are at least partially, preferably completely, encased by an electrically insulating material, preferably epoxy resin.
  • the electric shielding element and the winding are completely encased by the electrically insulating material, except for one or more electrical connections of winding.
  • the winding arrangement includes at least two of the at least one electric shielding element.
  • the at least two electric shielding elements are arranged at least partially offset, i.e., misaligned, from each other along a direction which is substantially perpendicular to the winding axis and/or a longitudinal axis of the transformer.
  • the at least two electric shielding elements are distributed and/or spaced apart along the direction which is substantially perpendicular to the winding axis and/or the longitudinal axis of the transformer.
  • the at least two electric shielding elements may be arranged at least partially offset from each other along a direction which is substantially parallel to the winding axis and/or a longitudinal axis of the transformer.
  • the at least two electric shielding elements are distributed and/or spaced apart along the direction which is substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
  • the winding arrangement includes at least three of the electric shielding elements.
  • at least two of the at least three electric shielding elements are arranged at least partially offset from each other along the direction which is substantially perpendicular to the winding axis and/or the longitudinal axis of the transformer, Alternatively, or additionally, at least two of the at least three electric shielding elements may be arranged at least partially offset from each other along a direction which is substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
  • This may increase the effectiveness and/or efficiency of the electric shielding elements, e.g., by increasing an area covered by the electric shielding elements and/or by allowing a more precise and/or targeted arrangement and/or distribution of the electric shielding elements, and/or may increase a flexibility in configuring, e.g., arranging, e.g., in a certain pattern, and/or manufacturing the electric shielding elements, e.g., allowing a size of each electric shielding element to be reduced, if deemed expedient.
  • the electric shielding elements are arranged in one or more rows which extend substantially perpendicularly to the winding axis and/or the longitudinal axis of the transformer
  • the electric shielding elements are arranged in one or more columns which extend substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
  • a cross-sectional shape of the electric shielding element is circular, rectangular, square, triangular, polygonal, or oval.
  • the electric shielding element is made entirely of an electrically conductive material, preferably metal.
  • lateral sides of the winding which preferably extend substantially parallel to the winding axis and/or the longitudinal axis of the transformer, are free of the electric shielding element.
  • the electric shielding element does not extend along the lateral sides of winding. This may reduce the complexity and/or size of the electric shielding element.
  • the electric shielding element is at least partially, preferably completely, hollow.
  • the electric shielding element may have at least one cavity which is substantially free of solid and/or liquid matter and/or empty, preferably even once the winding assembly is operably mounted in the transformer and/or even after the winding assembly has been at least partially encased in an insulating material, e.g., resin.
  • the electric shielding element has a cross-sectional shape, in at least one cross-section of the respective electric shielding element, which has a closed circumference and/or a closed outer contour.
  • the circumference and/or the outer contour of the electric shielding element at the cross-section may be free of gaps and/or may be continuous.
  • the electric shielding element has a cross-sectional shape, in at least one cross-section of the respective electric shielding element, which has an open circumference.
  • the circumference and/or the outer contour of the electric shielding element at the cross-section may have one or more gaps.
  • connection element is elongate, preferably along a length of the connection element which extends from the winding to the electric shielding element.
  • connection element is connected non-monolithically to the electric shielding element.
  • connection element and the electric shielding element may be manufactured separately and then interconnected in a connecting step, e.g., by welding, screwing, etc. This may reduce the complexity of the electric shielding element and/or the connection element, compared with an electric shielding element which directly contacts the winding. Moreover, this may provide a more reliable connection between the electric shielding element and the connection element.
  • the present disclosure also relates to a transformer including at least one winding arrangement according to any of the embodiments described herein and at least one core.
  • the winding of the winding arrangement may be arranged about at least a portion of the core.
  • the object mentioned at the beginning is also achieved by a method of manufacturing a winding arrangement of a transformer, preferably the winding arrangement according to any of the embodiments described herein, in particular the winding arrangement according to the first aspect of the present disclosure.
  • a method of manufacturing a winding arrangement of a transformer preferably the winding arrangement according to any of the embodiments described herein, in particular the winding arrangement according to the first aspect of the present disclosure.
  • the method may include: providing at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer.
  • the method may include: arranging at least one electric shielding element, which is made at least partially of an electrically conductive material, off-center, with respect to a vertical centerline of a cross-sectional area of the winding, along a section of a top side or a bottom side of the winding.
  • the method may include: electrically connecting the electric shielding element with the winding by at least one connection element made at least partially of an electrically conductive material.
  • connection element is a cable or a rod or a strip of the electrically conductive material.
  • the object mentioned at the beginning is also achieved by a method of manufacturing a winding arrangement of a transformer, preferably the winding arrangement according to any of the embodiments described herein, in particular the winding arrangement according to the second aspect of the present disclosure.
  • a method of manufacturing a winding arrangement of a transformer preferably the winding arrangement according to any of the embodiments described herein, in particular the winding arrangement according to the second aspect of the present disclosure.
  • the method may include: providing at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer.
  • the method may include: arranging at least three electric shielding elements, which are made at least partially of an electrically conductive material, preferably at least along a section of a top side or a bottom side of the winding.
  • the method may include: optionally, electrically connecting at least one, preferably each, of the electric shielding elements with the winding by at least one connection element made at least partially of an electrically conductive material.
  • Figs. 1 to 5 schematically show a cross-sectional view of a winding arrangement 10 of a transformer (see, e.g., transformer 100 in Figs. 7 and 8 ).
  • the winding arrangement 10 may include at least one winding 12 wound about at least one winding axis 14.
  • the winding 12 may be configured to be arranged about at least a portion of a core 104 of the transformer 100 (see, e.g., the core 104 in Figs. 7 and 8 ).
  • the winding 12 may have at least one cross-sectional area 16. It is noted that Figs. 1 to 5 only show one cross-sectional area 16 on one side of the winding axis 14.
  • the winding 12 may optionally include at least one further cross-sectional area on the same side of the winding axis 14 as the cross-sectional area 16 shown in Figs. 1 to 5 and/or one or more cross-sectional areas on the opposite side of the winding axis 14.
  • the winding axis 14 may coincide with and/or extend parallel to a longitudinal axis 108 (see Figs. 7 and 8 ) of the winding 12 and/or the transformer 100.
  • the cross-section shown in Figs. 1 to 5 corresponds to a cut which extends substantially along and/or parallel to the winding axis 14 and/or a longitudinal axis 108 of the winding 12 and/or the transformer 100.
  • the winding arrangement 10 may include at least one electric shielding element 18 made at least partially of an electrically conductive material.
  • the winding arrangement 10 may include at least one connection element 20 made at least partially of an electrically conductive material.
  • the connection element 20 may electrically connect or may be configured to electrically connect the electric shielding element 18 with the winding 12.
  • the connection element 20 may be a cable or a rod or a strip of the electrically conductive material.
  • the connection element 20 may be connected to the electric shielding element 18 at a connection interface 21.
  • the electric shielding element 18 may be arranged along a section of a top side 24 of the winding 12 and/or cross-sectional area 16, with respect to an operable state of the winding 12 in the transformer 100.
  • the electric shielding element 18 and/or a further electric shielding element may be arranged along a section of a bottom side 26 of the winding 12 and/or cross-sectional area 16 (not shown), with respect to an operable state of the winding 12 in the transformer 100.
  • the electric shielding element 18 may be arranged off-center along the section of the top side 24 or the bottom side 26 of the winding 12 and/or the cross-sectional area 16, optionally with respect to a centerline 28, in particular a vertical centerline 28, of the cross-sectional area 16 of the winding 12 and/or a center 30 of the top side 24 or a bottom side 26 of the winding 12 and/or cross-sectional area 16.
  • the electric shielding element 18 may be configured and arranged such that the electric shielding element 18 does not extend along lateral sides 34 of the winding 12.
  • the electric shielding element 18 may extend at least partially about the winding axis 14 and/or a longitudinal axis 108 of the transformer 100, when the winding 12 is operatively arranged in the transformer 100.
  • connection element 20 may be at least partially flexible and/or compliant and/or bendable.
  • the connection element 20 may be connected to the winding 12 at the top side 24 of the winding 12, as shown in Figs. 1 to 5 .
  • the connection element 20 may be connected to the winding 12 at the bottom side 26 and/or the lateral side 34 of the winding 12 and/or the cross-sectional area 16 of the winding 12.
  • the connection element 20 may be removably connected to the electric shielding element 18 and/or the winding 12.
  • the connection element 20 may be elongate.
  • the connection element 20 may be connected non-monolithically to the electric shielding element 18.
  • the electric shielding element 18 and the winding 12 may be at least partially, preferably completely, encased by an electrically insulating material, preferably epoxy resin.
  • the electric shielding element 18 and the winding 12 are completely encased by the electrically insulating material, except for one or more electrical connections of winding 12.
  • the winding arrangement 10 may include a plurality, preferably at least two (see, e.g., Figs. 2 and 3 ), preferably at least three (see, e.g., Fig. 4 ), preferably at least four (see, e.g., Fig. 5 ), of the at least one electric shielding element 18.
  • the electric shielding elements 18 or at least some of the electric shielding elements 18 may be substantially aligned to each other in a direction 40 which is substantially perpendicular to the winding axis 14 and/or a longitudinal axis 108 of the transformer 100 and/or in a direction 42 which is substantially parallel to the winding axis 14 and/or a longitudinal axis 108 of the transformer 100, as shown in Figs. 2 , 4 , and 5 .
  • the electric shielding elements 18 or at least some of the electric shielding elements 18 may be arranged at least partially offset from each other in the direction 40 and/or the direction 42, as shown in Figs. 3 to 5 .
  • the plurality of electric shielding elements 18 may be arranged in multiple rows 43A, 43B, as shown in Fig. 5 .
  • Each row 43A, 43B may extend substantially perpendicularly to the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, e.g., in the direction 40.
  • Each row 43A, 43B may include a plurality of electric shielding elements 18.
  • the electric shielding elements 18 may be arranged in one or more columns (not shown) which may extend substantially parallel to the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, e.g., in the direction 42.
  • Each column may include a plurality of electric shielding elements 18.
  • Fig. 6 shows a cross-sectional view of a winding arrangement 10, e.g., the winding arrangement 10 shown in Fig. 1 .
  • the cross-section shown in Fig. 6 corresponds to a cut which extends substantially perpendicularly to the winding axis 14 and/or the longitudinal axis 108 of the winding 12 and/or the transformer 100.
  • the electric shielding element 18 may be configured as a ring or semi-ring 46 which extends about the winding axis 14 and/or a longitudinal axis 108 of the transformer 100.
  • connection element 20 may be connected to only a section of a circumference 50, in particular a curved portion of the circumference 50, of the electric shielding element 18.
  • connection interface 21 may extend along no more than 30%, preferably no more 20%, preferably no more than 10%, preferably no more than 5%, of the circumference 50 of the ring or semi-ring 46.
  • the connection interface 21 may extend along no more than 80°, preferably no more 70°, preferably no more than 60°, preferably no more than 50°, preferably no more than 40°, preferably no more than 30°, preferably no more than 20°, preferably no more than 10°, of the circumference 50 of the ring or semi-ring 46.
  • the winding assembly 10 may include a plurality of the at least one connection element 20 which connect the electric shielding element 18 to the winding 12.
  • the connection elements 20 may be spaced apart from each other, preferably by at least 10%, preferably at least 20%, preferably at least 30%, of the circumference 50 of the ring or semi-ring 46 and/or by at least 10°, preferably at least 20°, preferably at least 30°, preferably at least 40°, of the circumference 50 of the ring or semi-ring 46.
  • the electric shielding element 18, more particularly the ring or semi-ring 46 may extend only partially about the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, preferably by no more than 270°, preferably no more than 300°, preferably no more than 330°, about the winding axis 14 and/or the longitudinal axis 108 of the winding 12 and/or the transformer 100.
  • the electric shielding element 18 may extend completely about the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, i.e., as a closed ring.
  • Fig. 7 shows a cross-sectional top view of a transformer 100.
  • the transformer 100 may include at least one winding arrangement 10 according to any of the embodiments described herein, e.g., the embodiment(s) of any of Figs. 1 to 6 .
  • the transformer 100 may include at least one core 104.
  • the winding 12 of the winding arrangement 10 may be arranged about at least a portion of the core 104.
  • Fig. 8 shows a schematic side view of the transformer 100.
  • the electric shielding element 18 and the winding 12 may be at least partially, preferably completely, encased by an electrically insulating material 110, preferably epoxy resin.
  • the electric shielding element 18 and the winding 12 are completely encased by the electrically insulating material 110, except for one or more electrical connections of winding 12.
  • the winding arrangement 10 may include a plurality of the at least winding 12A and 12B.
  • the plurality of windings 12A, 12B may be arranged radially spaced apart from each other, e.g., a first winding 12A of the plurality of windings may be wound about a second winding 12B of the plurality of windings.
  • the first winding 12A may be a high-voltage winding and the second winding 12b may be a low-voltage winding or vice versa.
  • the winding arrangement 10 may include at least one electric shielding element 18 along the top side 24 and/or bottom side 26 of each winding 12A, 12B or only one of the windings 12A, 12B.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

The present invention relates to a winding arrangement (10) of a transformer (100), including at least one winding (12) wound about a winding axis (14) and configured to be arranged about a core (104) of the transformer (100), an electric shielding element (18) made at least partially of an electrically conductive material, and a connection element (20) which is made at least partially of an electrically conductive material and electrically connects the electric shielding element (18) with the winding (12). The connection element (20) is a cable, a rod, or a strip of the electrically conductive material. The electric shielding element (18) is arranged along a section of a top side (24) or a bottom side (26) of the winding (12). The electric shielding element (18) is arranged off-center, with respect to a vertical centerline (28) of a cross-sectional area (16) of the winding (12), along the section of the top side (24) or the bottom side (26).
The present invention further relates to a transformer (100) and method of manufacturing a winding arrangement (10) of a transformer (100).

Description

  • Transformers are widely used to convert electricity from a first voltage level to a second voltage level, the second voltage level being either higher or lower than the first voltage level.
  • The transformer may comprise a winding arrangement which includes one or more windings, e.g., one or more primary windings and one or more secondary windings. One or more of the windings may be connected in series or in parallel.
  • The winding arrangement often includes a shielding element made of an electrically conductive material which at least partially covers one or more of the windings, in particular in order to adapt and/or adjust an electric field generated at the windings.
  • However, the winding arrangements with a shielding element known from the prior art have several disadvantages. For example, the shielding elements from the prior art often have a relatively complex shape and/or configuration which can make the shielding element relatively difficult, e.g., time-consuming and/or relatively expensive, to manufacture. Moreover, there is also a need to improve the effectiveness and/or the efficiency of the shielding effect of the shielding elements in the prior art.
  • Hence, deficiencies remain with respect to winding arrangements with a shielding element in the prior art. The prior art has not, or at least not sufficiently, addressed one or more of the disadvantages mentioned above.
  • Hence, it is an object of the present invention to provide an improved winding arrangement, in particular by at least partially improving one or more of the above-mentioned disadvantages.
  • This object is achieved by a winding arrangement of a transformer according to a first aspect of the present disclosure. Variations and further developments are defined by the features of the dependent claims.
  • The winding arrangement may include at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer. The winding may be made of an electrically conductive material. The winding arrangement may include at least one electric shielding element made at least partially of an electrically conductive material. The winding arrangement may include at least one connection element made at least partially of an electrically conductive material. The connection element may electrically connect the electric shielding element with the winding. The connection element may be a cable or a rod or a strip of the electrically conductive material. The electric shielding element may be arranged along a section of a top side or a bottom side of the winding. The electric shielding element may be arranged off-center along the section of the top side or the bottom side, optionally with respect to a centerline, in particular a vertical or substantially vertical centerline, of a cross-sectional area of the winding, and/or with respect to a center or middle of a top side or a bottom side of the cross-sectional area of the winding. The term "vertical"refers to an operable position of the transformer including the winding arrangement.
  • Configuring the winding arrangement with a connection element made at least partially of an electrically conductive material and electrically connecting the electric shielding element with the winding by the connection element may allow the electric shielding element and the connection element to be manufactured separately and/or individually. This may allow the configuration and/or the manufacturing process of the electric shielding element to be tailored to the requirements and/or desired characteristics of the electric shielding element, substantially independently of the connection element. For instance, providing an electric shielding element which directly contacts the winding may limit or constrain the configuration and/or the manufacturing process of the electric shielding element and/or may place certain requirements and/or restraints on the configuration and/or the manufacturing process of the electric shielding element which may at least partially be avoided by an electric shielding element which is electrically connected to the winding by a separate connection element according to the present disclosure. The winding arrangement described herein may also simplify the shape and the configuration of the electric shielding element. The same advantages also apply to the connection element.
  • Moreover, configuring the connection element as a cable or a rod or a strip of the electrically conductive material may provide a relatively simple and/or relatively compact means for electrically connecting the electric shielding element with the winding. Moreover, this may provide a relatively reliable means for electrically connecting the electric shielding element with the winding.
  • Furthermore, arranging the electric shielding element off-center may facilitate and/or increase (e.g., compared with an electric shielding element arranged, e.g., on the centerline of the cross-sectional area) the shielding function of the electric shielding element, e.g., by positioning the electric shielding element closer to an edge or corner of the winding and/or by increasing an effectiveness and/or an efficiency of the electric shielding element, in particular with respect to a more efficient position and/or use of a size and/or mass of the electric shielding element compared with the effectiveness of a electric shielding element arranged centrally. In other words, this may increase the effectiveness of the electric shielding element, in particular for a given size and/or mass of the electric shielding element.
  • The winding arrangement may be a winding arrangement of a dry-type transformer. Alternatively, the winding arrangement may be a winding arrangement of a liquid-immersed transformer.
  • The winding may include a plurality of winding portions which each include an electrically conductive material. The winding portions may be electrically interconnected. The winding portions may be arranged and/or interconnected in series or parallel.
  • The winding arrangement may include a plurality of the at least winding, e.g., at least one low-voltage winding and at least one high-voltage winding. The plurality of windings may be arranged radially spaced apart from each other, e.g., a first winding of the plurality of windings may be wound about a second winding of the plurality of windings.
  • The terms "top side" and "bottom side" of the winding refer to an operational position of the transformer. The top side and bottom side of the winding may extend perpendicularly or substantially perpendicularly to the winding axis and/or a longitudinal axis of the winding and/or the transformer, when the winding assembly is operably mounted in the transformer. The "top side" of the winding may be a top face or a top end face of the winding. The "bottom side" of the winding may be a bottom face or a bottom end face of the winding.
  • A "cross-sectional area", according to the present disclosure, means a single coherent, i.e., at least partially interconnected, cross-sectional area of the winding. In other words, when a cross-section of the full winding, i.e., across the entire winding on both sides of the winding axis, is considered, multiple cross-sectional areas may be present/visible, e.g., at least one cross-sectional area on each side of the winding axis, respectively. In this case, each cross-sectional area is considered an individual "cross-sectional area" within the meaning of the present disclosure.
  • The centerline of the cross-sectional area of the winding extends through a center of the cross-sectional area. The centerline may be a symmetry axis of the cross-sectional area. The centerline preferably extends substantially vertically and/or substantially parallel to the winding axis and/or the longitudinal axis of the winding and/or the transformer.
  • The cross-sectional area may be a cross-sectional area in a cross-section of the winding assembly along a plane which extends vertically and/or along and/or substantially parallel to the winding axis and/or the longitudinal axis of the winding and/or the transformer.
  • "Off-center" means, according to the present disclosure, that the electric shielding element is not aligned with a center of the section of the top side or the bottom side, in particular the mentioned centerline. In other words, a center of the electric shielding element is not aligned with a center of the section of the top side or the bottom side, in particular the mentioned centerline, i.e., the center of the section of the top side or the bottom side and/or centerline does not pass through a center of the electric shielding element, when the electric shielding element is arranged "off-center". In other words, the electric shielding element is arranged closer to a first lateral side and/or a first edge or corner of the winding, in particular the cross-sectional area, than a second lateral side opposite of the first lateral side and/or a second edge or corner of the winding opposite of the first edge or corner of the winding, in particular the cross-sectional area , when the electric shielding element is arranged "off-center".
  • The winding may be any type of winding used in transformers. For instance, the winding may be a helical winding, a foil winding, a disc winding, or any other type of known winding.
  • The electric shielding element may have a cross-sectional area, at at least one cross-section of the electric shielding element, which includes at least one cavity, e.g., in a tube-like manner. Alternatively, the cross-sectional area may be substantially solid, i.e., substantially without any cavities.
  • The electric shielding element is preferably at least partially, preferably completely, made of metal.
  • The term "strip" is understood as a relatively long, flat, and narrow element. The "strip" of the electrically conductive material may have a length, which preferably extends between the electric shielding element and the winding, which is greater than a width and/or a thickness of the "strip".
  • Preferably, the winding arrangement includes at least two, preferably at least three, preferably at least four, of the electric shielding elements. This may further increase the effectiveness and/or efficiency of the electric shielding elements, e.g., by increasing an area covered by the electric shielding elements and/or by allowing a more precise and/or targeted arrangement and/or distribution of the electric shielding elements, and/or may increase a flexibility in configuring, e.g., arranging, e.g., in a certain pattern, and/or manufacturing the electric shielding elements, e.g., by allowing a size of each electric shielding element to be reduced and/or varied, if deemed expedient.
  • In case a plurality of electric shielding elements is provided, the electric shielding elements may be electrically interconnected.
  • The object mentioned at the beginning is also achieved by a winding arrangement of or for a transformer according to a second aspect of the present disclosure. The winding arrangement may include at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer. The winding arrangement may include at least three electric shielding elements made at least partially of an electrically conductive material. The electric shielding elements may be arranged along at least a section of a top side or a bottom side of the winding. The electric shielding elements may be electrically interconnected.
  • The winding arrangement may include at least one connection element which may be made at least partially of an electrically conductive material. The connection element may electrically connect at least one, preferably each, of the electric shielding elements with the winding. The connection element may be a cable or a rod or a strip of the electrically conductive material.
  • Any of the features and/or embodiments described herein, e.g., above and/or below, may be implemented in the winding arrangement according to the first aspect of the present disclosure and/or in the winding arrangement according to the second aspect of the present disclosure. In this regard, for instance, although the description may refer to "electric shielding element" with respect to one or more features and/or configuration, the respective feature and/or configuration may apply to each electric shielding element, in case the winding arrangement may include multiple electric shielding elements, e.g., such as the winding arrangement according to the second aspect of the present disclosure described above.
  • The winding arrangement according to the first aspect of the present disclosure and the winding arrangement according to the second aspect of the present disclosure may be implemented individually/separately. Alternatively, the winding arrangement according to the first aspect of the present disclosure and the winding arrangement according to the second aspect of the present disclosure may be combined.
  • Preferably, the electric shielding element extends at least partially about the winding axis and/or a longitudinal axis of the transformer, when the winding is operatively arranged in the transformer. Preferably, the electric shielding element is configured as a ring or semi-ring which extends about the winding axis and/or a longitudinal axis of the transformer. This may provide a shielding function, by means of the electric shielding element, along a relatively large section, e.g., a portion of a circumference, of the winding. The winding axis and/or the longitudinal axis of the winding and/or the transformer may be a center axis of the ring or semi-ring.
  • Preferably, the connection element is connected to the electric shielding element at a connection interface of the ring or semi-ring. The connection interface may extend along no more than 30%, preferably no more 20%, preferably no more than 10%, preferably no more than 5%, of a circumference and/or an extension of the ring or semi-ring around the winding. Alternatively, or additionally, the connection interface may extend along no more than 80°, preferably no more 70°, preferably no more than 60°, preferably no more than 50°, preferably no more than 40°, preferably no more than 30°, preferably no more than 20°, preferably no more than 10°, of a circumference and/or an extension of the ring or semi-ring around the winding. This may allow the connection element to be relatively compact and/or may facilitate installation, e.g., by allowing a relatively simple connection of the connection element to the electric shielding element.
  • Preferably, the winding arrangement includes a plurality of the at least one connection element. This may increase a degree of fixation between the winding and the electric shielding element and/or may distribute the connection, e.g., connective forces, between the winding and the electric shielding element over the plurality of connection elements.
  • Preferably, the plurality of connection elements are spaced apart from each other. Preferably, the plurality of connection elements are spaced apart from each other:
    • by at least 10%, preferably at least 20%, preferably at least 30%, of a circumference of the ring or semi-ring;
      and/or
    • by at least 10°, preferably at least 20°, preferably at least 30°, preferably at least 40°, of a circumference of the ring or semi-ring. This may facilitate a distribution of the connection, e.g., connective forces, between the winding and the electric shielding element to the plurality of connection elements.
  • Alternatively, the winding arrangement may include only a single connection element.
  • Preferably, the electric shielding element extends only partially about the winding axis and/or a longitudinal axis of the transformer, preferably by no more than 270°, preferably no more than 300°, preferably no more than 330°, about the winding axis and/or a longitudinal axis of the winding and/or the transformer. In other words, the electric shielding element may extend semi-annularly about the winding axis and/or the longitudinal axis of the winding and/or the transformer.
  • Preferably, the connection element is at least partially flexible and/or compliant and/or bendable. This may facilitate installation of the connection element and/or may allow the connection element to be adjusted more easily and/or to a greater extent. The characteristics "least partially flexible and/or compliant and/or bendable" refer to a state of the connection element before the connection element is mounted and/or potentially fixed, e.g., potentially encased in epoxy resin, in the winding arrangement.
  • Preferably, the connection element is connected to only a section of a circumference or extension, in particular a curved portion of the circumference or extension, of the electric shielding element.
  • Preferably, the connection element is removably connected to the electric shielding element and/or the winding. This may allow the connection element to be removed, and potentially reattached or replaced. The term "removably connected" means that the connection element may be removed without compromising the structural integrity of the connecting element, in particular to such a degree that the connection element could not be reused. The characteristic "removably connected" refers to a state of the connection element before the connection element is mounted and/or potentially fixed, e.g., potentially encased in epoxy resin, in the winding arrangement. The connection element may be removable from the electric shielding element even after the connection element has been mounted and/or potentially fixed, e.g., potentially encased in epoxy resin, in the winding arrangement, e.g., after at least partially removing the epoxy resin.
  • Preferably, the connection element is connected to the electric shielding element at a single point and/or the connection element is connected to the winding at a single point.
  • Preferably, the connection element is connected to the winding at the top side and/or the bottom side and/or a lateral side of the winding, the lateral side preferably connecting the top side and bottom side.
  • Preferably, the electric shielding element and the winding are at least partially, preferably completely, encased by an electrically insulating material, preferably epoxy resin. Preferably, the electric shielding element and the winding are completely encased by the electrically insulating material, except for one or more electrical connections of winding.
  • Preferably, the winding arrangement includes at least two of the at least one electric shielding element.
  • Preferably, the at least two electric shielding elements are arranged at least partially offset, i.e., misaligned, from each other along a direction which is substantially perpendicular to the winding axis and/or a longitudinal axis of the transformer. Preferably, the at least two electric shielding elements are distributed and/or spaced apart along the direction which is substantially perpendicular to the winding axis and/or the longitudinal axis of the transformer. Alternatively, or additionally, the at least two electric shielding elements may be arranged at least partially offset from each other along a direction which is substantially parallel to the winding axis and/or a longitudinal axis of the transformer. Preferably, the at least two electric shielding elements are distributed and/or spaced apart along the direction which is substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
  • Preferably, the winding arrangement includes at least three of the electric shielding elements. Preferably, at least two of the at least three electric shielding elements are arranged at least partially offset from each other along the direction which is substantially perpendicular to the winding axis and/or the longitudinal axis of the transformer, Alternatively, or additionally, at least two of the at least three electric shielding elements may be arranged at least partially offset from each other along a direction which is substantially parallel to the winding axis and/or the longitudinal axis of the transformer. This may increase the effectiveness and/or efficiency of the electric shielding elements, e.g., by increasing an area covered by the electric shielding elements and/or by allowing a more precise and/or targeted arrangement and/or distribution of the electric shielding elements, and/or may increase a flexibility in configuring, e.g., arranging, e.g., in a certain pattern, and/or manufacturing the electric shielding elements, e.g., allowing a size of each electric shielding element to be reduced, if deemed expedient.
  • Preferably, the electric shielding elements are arranged in one or more rows which extend substantially perpendicularly to the winding axis and/or the longitudinal axis of the transformer
  • Preferably, the electric shielding elements are arranged in one or more columns which extend substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
  • Preferably, a cross-sectional shape of the electric shielding element is circular, rectangular, square, triangular, polygonal, or oval.
  • Preferably, the electric shielding element is made entirely of an electrically conductive material, preferably metal.
  • Preferably, lateral sides of the winding, which preferably extend substantially parallel to the winding axis and/or the longitudinal axis of the transformer, are free of the electric shielding element. In other words, preferably, the electric shielding element does not extend along the lateral sides of winding. This may reduce the complexity and/or size of the electric shielding element.
  • Preferably, the electric shielding element is at least partially, preferably completely, hollow. In other words, the electric shielding element may have at least one cavity which is substantially free of solid and/or liquid matter and/or empty, preferably even once the winding assembly is operably mounted in the transformer and/or even after the winding assembly has been at least partially encased in an insulating material, e.g., resin.
  • Preferably, the electric shielding element has a cross-sectional shape, in at least one cross-section of the respective electric shielding element, which has a closed circumference and/or a closed outer contour. In other words, the circumference and/or the outer contour of the electric shielding element at the cross-section may be free of gaps and/or may be continuous. Alternatively, or additionally, the electric shielding element has a cross-sectional shape, in at least one cross-section of the respective electric shielding element, which has an open circumference. In other words, the circumference and/or the outer contour of the electric shielding element at the cross-section may have one or more gaps.
  • Preferably, the connection element is elongate, preferably along a length of the connection element which extends from the winding to the electric shielding element.
  • Preferably, the connection element is connected non-monolithically to the electric shielding element. In other words, the connection element and the electric shielding element may be manufactured separately and then interconnected in a connecting step, e.g., by welding, screwing, etc. This may reduce the complexity of the electric shielding element and/or the connection element, compared with an electric shielding element which directly contacts the winding. Moreover, this may provide a more reliable connection between the electric shielding element and the connection element.
  • The present disclosure also relates to a transformer including at least one winding arrangement according to any of the embodiments described herein and at least one core. The winding of the winding arrangement may be arranged about at least a portion of the core.
  • The object mentioned at the beginning is also achieved by a method of manufacturing a winding arrangement of a transformer, preferably the winding arrangement according to any of the embodiments described herein, in particular the winding arrangement according to the first aspect of the present disclosure. The features, embodiments, and advantages, as detailed herein with respect to the winding arrangement, in particular the winding arrangement according to the first aspect of the present disclosure, apply to the method accordingly.
  • The steps of the method described herein are not limited to a particular sequence and may be performed in any technically feasible sequence.
  • The method may include:
    providing at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer.
  • The method may include:
    arranging at least one electric shielding element, which is made at least partially of an electrically conductive material, off-center, with respect to a vertical centerline of a cross-sectional area of the winding, along a section of a top side or a bottom side of the winding.
  • The method may include:
    electrically connecting the electric shielding element with the winding by at least one connection element made at least partially of an electrically conductive material.
  • Preferably, the connection element is a cable or a rod or a strip of the electrically conductive material.
  • The object mentioned at the beginning is also achieved by a method of manufacturing a winding arrangement of a transformer, preferably the winding arrangement according to any of the embodiments described herein, in particular the winding arrangement according to the second aspect of the present disclosure. The features, embodiments, and advantages, as detailed herein with respect to the winding arrangement, in particular the winding arrangement according to the second aspect of the present disclosure, apply to the method accordingly.
  • The steps of the method described herein are not limited to a particular sequence and may be performed in any technically feasible sequence.
  • The method may include:
    providing at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer.
  • The method may include:
    arranging at least three electric shielding elements, which are made at least partially of an electrically conductive material, preferably at least along a section of a top side or a bottom side of the winding.
  • The method may include:
    optionally, electrically connecting at least one, preferably each, of the electric shielding elements with the winding by at least one connection element made at least partially of an electrically conductive material.
  • The following list of aspects provides preferred embodiments of the present disclosure:
    1. 1. A winding arrangement of or for a transformer, including:
      • at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer;
      • at least one electric shielding element made at least partially of an electrically conductive material; and
      • at least one connection element made at least partially of an electrically conductive material, wherein the connection element electrically connects the electric shielding element with the winding, preferably wherein the connection element is a cable or a rod or a strip of the electrically conductive material;
      • wherein the electric shielding element is arranged along at least a section of a top side or a bottom side of the winding;
      • preferably wherein the electric shielding element is arranged off-center along the section of the top side or the bottom side, optionally with respect to a centerline, in particular a vertical centerline, of a cross-sectional area of the winding and/or a center of a top side or a bottom side of the cross-sectional area of the winding, respectively.
    2. 2. The winding arrangement according to aspect 1, wherein the winding arrangement includes at least two, preferably at least three, preferably at least four, of the electric shielding elements.
    3. 3. The winding arrangement according to aspect 1 or 2, wherein the winding arrangement includes at least three of the electric shielding elements, preferably at least four of the electric shielding elements, preferably wherein:
      • at least two of the electric shielding elements are arranged at least partially offset from each other along the direction which is substantially perpendicular to the winding axis and/or the longitudinal axis of the transformer;
        and/or
      • at least two of the electric shielding elements are arranged at least partially offset from each other along a direction which is substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
    4. 4. A winding arrangement of or for a transformer, including:
      • at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer;
      • at least three electric shielding elements made at least partially of an electrically conductive material; and
      • wherein the electric shielding elements are arranged along at least a section of a top side or a bottom side of the winding;
      • optionally including at least one connection element made at least partially of an electrically conductive material, wherein the connection element electrically connects at least one, preferably each, of the electric shielding elements with the winding, optionally wherein the connection element is a cable or a rod or a strip of the electrically conductive material.
    5. 5. The winding arrangement according to aspect 4, wherein at least some of the electric shielding elements are arranged off-center along the section of the top side or the bottom side, optionally with respect to a centerline, in particular a vertical centerline, of a cross-sectional area of the winding and/or a center of a top side or a bottom side of the cross-sectional area of the winding, respectively.
    6. 6. The winding arrangement according to any of aspects 2 to 5, wherein at least some of the electric shielding elements are arranged in one or more rows which extend substantially perpendicularly to the winding axis and/or the longitudinal axis of the transformer
    7. 7. The winding arrangement according to any of aspects 2 to 6, wherein at least some of the electric shielding elements are arranged in one or more columns which extend substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
    8. 8. The winding arrangement according to any of the preceding aspects, wherein the electric shielding element(s) extend(s) at least partially about the winding axis and/or a longitudinal axis of the transformer, when the winding is operatively arranged in the transformer.
    9. 9. The winding arrangement according to any of the preceding aspects, wherein the electric shielding element(s) is/are configured as a ring or semi-ring which preferably extends about the winding axis and/or a longitudinal axis of the transformer.
    10. 10. The winding arrangement according to any of the preceding aspects, wherein the connection element is connected to the electric shielding element at a connection interface, preferably of the ring or semi-ring, wherein the connection interface extends along:
      • no more than 30%, preferably no more 20%, preferably no more than 10%, preferably no more than 5%, of a circumference of the electric shielding element;
        and/or
      • no more than 80°, preferably no more 70°, preferably no more than 60°, preferably no more than 50°, preferably no more than 40°, preferably no more than 30°, preferably no more than 20°, preferably no more than 10°, of a circumference of the electric shielding element.
    11. 11. The winding arrangement according to any of the preceding aspects, including a plurality of the at least one connection element, wherein the connection elements are spaced apart from each other, preferably:
      • by at least 10%, preferably at least 20%, preferably at least 30%, of a circumference of the electric shielding element;
        and/or
      • by at least 10°, preferably at least 20°, preferably at least 30°, preferably at least 40°, of the electric shielding element.
    12. 12. The winding arrangement according to any of the preceding aspects, wherein the electric shielding element(s) extend(s) only partially about the winding axis and/or a longitudinal axis of the transformer, preferably by no more than 270°, preferably no more than 300°, preferably no more than 330°, about the winding axis and/or a longitudinal axis of the transformer.
    13. 13. The winding arrangement according to any of the preceding aspects, wherein the connection element is at least partially flexible and/or compliant and/or bendable.
    14. 14. The winding arrangement according to any of the preceding aspects, wherein the connection element is connected to only a section of a circumference, in particular a curved portion of the circumference, of the electric shielding element.
    15. 15. The winding arrangement according to any of the preceding aspects, wherein the connection element is removably connected to the electric shielding element and/or the winding.
    16. 16. The winding arrangement according to any of the preceding aspects, wherein the connection element is connected to the electric shielding element at a single point and/or the connection element is connected to the winding at a single point.
    17. 17. The winding arrangement according to any of the preceding aspects, wherein the connection element is connected to the winding at the top side and/or the bottom side and/or a lateral side of the winding, the lateral side preferably connecting the top side and bottom side.
    18. 18. The winding arrangement according to any of the preceding aspects, wherein the electric shielding element(s) and the winding are at least partially, preferably completely, encased by an electrically insulating material, preferably epoxy resin.
    19. 19. The winding arrangement according to any of the preceding aspects, including at least two of the at least one electric shielding element, preferably wherein the at least two electric shielding elements:
      • are arranged at least partially offset from each other along a direction which is substantially perpendicular to the winding axis and/or a longitudinal axis of the transformer;
        and/or
      • are arranged at least partially offset from each other along a direction which is substantially parallel to the winding axis and/or a longitudinal axis of the transformer.
    20. 20. The winding arrangement according to any of the preceding aspects, wherein a cross-sectional shape of the electric shielding element is circular, rectangular, square, triangular, polygonal, or oval.
    21. 21. The winding arrangement according to any of the preceding aspects, wherein the electric shielding element is made entirely of an electrically conductive material, preferably metal.
    22. 22. The winding arrangement according to any of the preceding aspects, wherein lateral sides of the winding, which preferably extend substantially parallel to the winding axis and/or the longitudinal axis of the transformer, are free of the electric shielding element.
    23. 23. The winding arrangement according to any of the preceding aspects, wherein the electric shielding element is at least partially, preferably completely, hollow.
    24. 24. The winding arrangement according to any of the preceding aspects, wherein the electric shielding element has a cross-sectional shape, in at least one cross-section of the respective electric shielding element, which has a closed circumference.
    25. 25. The winding arrangement according to any of the preceding aspects, wherein the connection element is elongate.
    26. 26. The winding arrangement according to any of the preceding aspects, wherein the connection element is connected non-monolithically to the electric shielding element.
    27. 27. A transformer including at least one winding arrangement according to any of the preceding aspects and at least one core, wherein the winding of the winding arrangement is arranged about at least a portion of the core.
    28. 28. A method of manufacturing a winding arrangement of or for a transformer, preferably the winding arrangement of any of aspects 1 to 26, the method including:
      • providing at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer;
      • arranging at least one electric shielding element, which is made at least partially of an electrically conductive material along at least a section of a top side or a bottom side of the winding, preferably off-center, optionally with respect to a centerline, in particular a vertical centerline, of a cross-sectional area of the winding and/or a center of a top side or a bottom side of the cross-sectional area of the winding;
      • electrically connecting the electric shielding element with the winding by at least one connection element made at least partially of an electrically conductive material, preferably wherein the connection element is a cable or a rod or a strip of the electrically conductive material.
    29. 29. A method of manufacturing a winding arrangement of a transformer, preferably the winding arrangement of any of aspects 4 to 26, the method including:
      • providing at least one winding wound about at least one winding axis and configured to be arranged about at least a portion of a core of the transformer;
      • arranging at least three electric shielding elements, which are made at least partially of an electrically conductive material, preferably at least along a section of a top side or a bottom side of the winding;
      • optionally electrically connecting at least one, preferably each, of the electric shielding elements with the winding by at least one connection element made at least partially of an electrically conductive material.
  • Preferred embodiments of the present invention are further elucidated below with reference to the figures. The described embodiments are merely exemplary and do not limit the present invention, as defined by the claims and their respective equivalents.
    • Fig. 1 shows, in a schematic and cross-sectional view, a winding arrangement of a transformer according to an embodiment of the present disclosure;
    • Fig. 2 shows, in a schematic and cross-sectional view, a winding arrangement of a transformer according to an embodiment of the present disclosure;
    • Fig. 3 shows, in a schematic and cross-sectional view, a winding arrangement of a transformer according to an embodiment of the present disclosure;
    • Fig. 4 shows, in a schematic and cross-sectional view, a winding arrangement of a transformer according to an embodiment of the present disclosure;
    • Fig. 5 shows, in a schematic and cross-sectional view, a winding arrangement of a transformer according to an embodiment of the present disclosure;
    • Fig. 6 shows, in a schematic and cross-sectional view, a winding arrangement of a transformer according to an embodiment of the present disclosure;
    • Fig. 7 show, in schematic and cross-sectional top view, a transformer according to an embodiment of the present disclosure;
    • Fig. 8 shows, in a schematic side view, the transformer of Fig. 7.
  • Figs. 1 to 5 schematically show a cross-sectional view of a winding arrangement 10 of a transformer (see, e.g., transformer 100 in Figs. 7 and 8). The winding arrangement 10 may include at least one winding 12 wound about at least one winding axis 14. The winding 12 may be configured to be arranged about at least a portion of a core 104 of the transformer 100 (see, e.g., the core 104 in Figs. 7 and 8). The winding 12 may have at least one cross-sectional area 16. It is noted that Figs. 1 to 5 only show one cross-sectional area 16 on one side of the winding axis 14. However, the winding 12 may optionally include at least one further cross-sectional area on the same side of the winding axis 14 as the cross-sectional area 16 shown in Figs. 1 to 5 and/or one or more cross-sectional areas on the opposite side of the winding axis 14. The winding axis 14 may coincide with and/or extend parallel to a longitudinal axis 108 (see Figs. 7 and 8) of the winding 12 and/or the transformer 100. The cross-section shown in Figs. 1 to 5 corresponds to a cut which extends substantially along and/or parallel to the winding axis 14 and/or a longitudinal axis 108 of the winding 12 and/or the transformer 100.
  • The winding arrangement 10 may include at least one electric shielding element 18 made at least partially of an electrically conductive material. The winding arrangement 10 may include at least one connection element 20 made at least partially of an electrically conductive material. The connection element 20 may electrically connect or may be configured to electrically connect the electric shielding element 18 with the winding 12. The connection element 20 may be a cable or a rod or a strip of the electrically conductive material. The connection element 20 may be connected to the electric shielding element 18 at a connection interface 21.
  • As shown in Figs. 1 to 5, the electric shielding element 18 may be arranged along a section of a top side 24 of the winding 12 and/or cross-sectional area 16, with respect to an operable state of the winding 12 in the transformer 100. Alternatively, or additionally, the electric shielding element 18 and/or a further electric shielding element may be arranged along a section of a bottom side 26 of the winding 12 and/or cross-sectional area 16 (not shown), with respect to an operable state of the winding 12 in the transformer 100.
  • The electric shielding element 18 may be arranged off-center along the section of the top side 24 or the bottom side 26 of the winding 12 and/or the cross-sectional area 16, optionally with respect to a centerline 28, in particular a vertical centerline 28, of the cross-sectional area 16 of the winding 12 and/or a center 30 of the top side 24 or a bottom side 26 of the winding 12 and/or cross-sectional area 16.
  • Lateral sides 34 of the winding 12, which preferably extend substantially parallel to the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, may be completely free of the electric shielding element 18. In other words, the electric shielding element 18 may be configured and arranged such that the electric shielding element 18 does not extend along lateral sides 34 of the winding 12.
  • The electric shielding element 18 may extend at least partially about the winding axis 14 and/or a longitudinal axis 108 of the transformer 100, when the winding 12 is operatively arranged in the transformer 100.
  • The connection element 20 may be at least partially flexible and/or compliant and/or bendable. The connection element 20 may be connected to the winding 12 at the top side 24 of the winding 12, as shown in Figs. 1 to 5. Alternatively, or additionally, the connection element 20 may be connected to the winding 12 at the bottom side 26 and/or the lateral side 34 of the winding 12 and/or the cross-sectional area 16 of the winding 12. The connection element 20 may be removably connected to the electric shielding element 18 and/or the winding 12. The connection element 20 may be elongate. The connection element 20 may be connected non-monolithically to the electric shielding element 18.
  • The electric shielding element 18 and the winding 12 may be at least partially, preferably completely, encased by an electrically insulating material, preferably epoxy resin. Preferably, the electric shielding element 18 and the winding 12 are completely encased by the electrically insulating material, except for one or more electrical connections of winding 12.
  • As shown in Figs. 2 to 5, the winding arrangement 10 may include a plurality, preferably at least two (see, e.g., Figs. 2 and 3), preferably at least three (see, e.g., Fig. 4), preferably at least four (see, e.g., Fig. 5), of the at least one electric shielding element 18. The electric shielding elements 18 or at least some of the electric shielding elements 18 may be substantially aligned to each other in a direction 40 which is substantially perpendicular to the winding axis 14 and/or a longitudinal axis 108 of the transformer 100 and/or in a direction 42 which is substantially parallel to the winding axis 14 and/or a longitudinal axis 108 of the transformer 100, as shown in Figs. 2, 4, and 5. Alternatively, or additionally, the electric shielding elements 18 or at least some of the electric shielding elements 18 may be arranged at least partially offset from each other in the direction 40 and/or the direction 42, as shown in Figs. 3 to 5. The plurality of electric shielding elements 18 may be arranged in multiple rows 43A, 43B, as shown in Fig. 5. Each row 43A, 43B may extend substantially perpendicularly to the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, e.g., in the direction 40. Each row 43A, 43B may include a plurality of electric shielding elements 18. Alternatively, or additionally, the electric shielding elements 18 may be arranged in one or more columns (not shown) which may extend substantially parallel to the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, e.g., in the direction 42. Each column may include a plurality of electric shielding elements 18.
  • Fig. 6 shows a cross-sectional view of a winding arrangement 10, e.g., the winding arrangement 10 shown in Fig. 1. The cross-section shown in Fig. 6 corresponds to a cut which extends substantially perpendicularly to the winding axis 14 and/or the longitudinal axis 108 of the winding 12 and/or the transformer 100.
  • As shown in Fig. 6, the electric shielding element 18 may be configured as a ring or semi-ring 46 which extends about the winding axis 14 and/or a longitudinal axis 108 of the transformer 100.
  • The connection element 20 may be connected to only a section of a circumference 50, in particular a curved portion of the circumference 50, of the electric shielding element 18.
  • The connection interface 21 (see Fig. 1) may extend along no more than 30%, preferably no more 20%, preferably no more than 10%, preferably no more than 5%, of the circumference 50 of the ring or semi-ring 46. Alternatively, or additionally, the connection interface 21 (see Fig. 1) may extend along no more than 80°, preferably no more 70°, preferably no more than 60°, preferably no more than 50°, preferably no more than 40°, preferably no more than 30°, preferably no more than 20°, preferably no more than 10°, of the circumference 50 of the ring or semi-ring 46.
  • As mentioned above, the winding assembly 10 may include a plurality of the at least one connection element 20 which connect the electric shielding element 18 to the winding 12. The connection elements 20 may be spaced apart from each other, preferably by at least 10%, preferably at least 20%, preferably at least 30%, of the circumference 50 of the ring or semi-ring 46 and/or by at least 10°, preferably at least 20°, preferably at least 30°, preferably at least 40°, of the circumference 50 of the ring or semi-ring 46.
  • As shown in Fig. 6, the electric shielding element 18, more particularly the ring or semi-ring 46, may extend only partially about the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, preferably by no more than 270°, preferably no more than 300°, preferably no more than 330°, about the winding axis 14 and/or the longitudinal axis 108 of the winding 12 and/or the transformer 100. Alternatively, the electric shielding element 18 may extend completely about the winding axis 14 and/or the longitudinal axis 108 of the transformer 100, i.e., as a closed ring.
  • Fig. 7 shows a cross-sectional top view of a transformer 100. The transformer 100 may include at least one winding arrangement 10 according to any of the embodiments described herein, e.g., the embodiment(s) of any of Figs. 1 to 6. The transformer 100 may include at least one core 104. The winding 12 of the winding arrangement 10 may be arranged about at least a portion of the core 104. Fig. 8 shows a schematic side view of the transformer 100. As mentioned above, the electric shielding element 18 and the winding 12 may be at least partially, preferably completely, encased by an electrically insulating material 110, preferably epoxy resin. Preferably, the electric shielding element 18 and the winding 12 are completely encased by the electrically insulating material 110, except for one or more electrical connections of winding 12.
  • The winding arrangement 10 may include a plurality of the at least winding 12A and 12B. The plurality of windings 12A, 12B may be arranged radially spaced apart from each other, e.g., a first winding 12A of the plurality of windings may be wound about a second winding 12B of the plurality of windings. The first winding 12A may be a high-voltage winding and the second winding 12b may be a low-voltage winding or vice versa. The winding arrangement 10 may include at least one electric shielding element 18 along the top side 24 and/or bottom side 26 of each winding 12A, 12B or only one of the windings 12A, 12B.

Claims (15)

  1. A winding arrangement (10) of a transformer (100), including:
    at least one winding (12) wound about at least one winding axis (14) and configured to be arranged about at least a portion of a core (104) of the transformer (100);
    at least one electric shielding element (18) made at least partially of an electrically conductive material; and
    at least one connection element (20) made at least partially of an electrically conductive material, wherein the connection element (20) electrically connects the electric shielding element (18) with the winding (12), wherein the connection element (20) is a cable or a rod or a strip of the electrically conductive material;
    wherein the electric shielding element (18) is arranged along a section of a top side (24) or a bottom side (26) of the winding (12); and
    wherein the electric shielding element (18) is arranged off-center, with respect to a vertical centerline (28) of a cross-sectional area (16) of the winding (12), along the section of the top side (24) or the bottom side (26).
  2. The winding arrangement (10) according to claim 1, wherein the electric shielding element (18) extends at least partially about the winding axis (14) and/or a longitudinal axis (108) of the transformer (100), when the winding (12) is operatively arranged in the transformer (100)
  3. The winding arrangement (10) according to claim 1 or 2, wherein the electric shielding element (18) is configured as a ring or semi-ring (46) which extends about the winding axis (14) and/or a longitudinal axis (108) of the transformer (100).
  4. The winding arrangement (10) according to claim 3, wherein the connection element (20) is connected to the electric shielding element (18) at a connection interface (21) of the ring or semi-ring (46), wherein the connection interface (21) extends along:
    no more than 30%, preferably no more 20%, preferably no more than 10%, preferably no more than 5%, of a circumference (50) of the ring or semi-ring (46);
    and/or
    no more than 80°, preferably no more 70°, preferably no more than 60°, preferably no more than 50°, preferably no more than 40°, preferably no more than 30°, preferably no more than 20°, preferably no more than 10°, of a circumference (50) of the ring or semi-ring (46).
  5. The winding arrangement (10) according to claim 3 or 4, including a plurality of the at least one connection element (20), wherein the connection elements (20) are spaced apart from each other, preferably:
    by at least 10%, preferably at least 20%, preferably at least 30%, of a circumference (50) of the ring or semi-ring (46);
    and/or
    by at least 10°, preferably at least 20°, preferably at least 30°, preferably at least 40°, of a circumference (50) of the ring or semi-ring (46).
  6. The winding arrangement (10) according to any of the preceding claims, wherein the connection element (20) is at least partially flexible and/or compliant and/or bendable.
  7. The winding arrangement (10) according to any of the preceding claims, wherein the connection element (20) is connected to only a section of a circumference (50), in particular a curved portion of the circumference (50), of the electric shielding element (18).
  8. The winding arrangement (10) according to any of the preceding claims, wherein the connection element (20) is removably connected to the electric shielding element (18) and/or the winding (12).
  9. The winding arrangement (10) according to any of the preceding claims, wherein the connection element (20) is connected to the winding (12) at the top side (24) and/or the bottom side (26) and/or a lateral side (34) of the winding (12), the lateral side (34) preferably connecting the top side (24) and the bottom side (26).
  10. The winding arrangement (10) according to any of the preceding claims, including at least two of the at least one electric shielding element (18), wherein the at least two electric shielding elements (18):
    are arranged at least partially offset from each other along a direction (40) which is substantially perpendicular to the winding axis (14) and/or a longitudinal axis (108) of the transformer (100);
    and/or
    are arranged at least partially offset from each other along a direction (42) which is substantially parallel to the winding axis (14) and/or a longitudinal axis (108) of the transformer (100).
  11. The winding arrangement (10) according to any of the preceding claims, wherein the winding arrangement includes at least three, preferably at least four, of the at least one electric shielding element, preferably wherein two of the shielding elements are arranged at least partially offset from each other along the direction which is substantially perpendicular to the winding axis and/or the longitudinal axis of the transformer and two of the electric shielding elements are arranged at least partially offset from each other along a direction which is substantially parallel to the winding axis and/or the longitudinal axis of the transformer.
  12. The winding arrangement (10) according to any of the preceding claims, wherein lateral sides (34) of the winding (12), which preferably extend substantially parallel to the winding axis (14) and/or the longitudinal axis (108) of the transformer (100), are free of the electric shielding element (18).
  13. The winding arrangement (10) according to any of the preceding claims, wherein the connection element (20) is connected non-monolithically to the electric shielding element (18).
  14. A transformer (100) including at least one winding arrangement (10) according to any of the preceding claims and at least one core (104), wherein the winding (12) of the winding arrangement (10) is arranged about at least a portion of the core (104).
  15. A method of manufacturing a winding arrangement (10) of a transformer (100), preferably the winding arrangement (10) of any of claims 1 to 13, the method including:
    providing at least one winding (12) wound about at least one winding axis (14) and configured to be arranged about at least a portion of a core (104) of the transformer (100);
    arranging at least one electric shielding element (18), which is made at least partially of an electrically conductive material, off-center, with respect to a vertical centerline (28) of a cross-sectional area (16) of the winding (12), along a section of a top side (24) or a bottom side (26) of the winding (12);
    electrically connecting the electric shielding element (18) with the winding (12) by at least one connection element (20) made at least partially of an electrically conductive material, wherein the connection element (20) is a cable or a rod or a strip of the electrically conductive material.
EP24382838.1A 2024-07-30 2024-07-30 Winding arrangement, transformer, and method of manufacturing a winding arrangement of a transformer Pending EP4687159A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP24382838.1A EP4687159A1 (en) 2024-07-30 2024-07-30 Winding arrangement, transformer, and method of manufacturing a winding arrangement of a transformer
PCT/EP2025/069509 WO2026027199A1 (en) 2024-07-30 2025-07-09 Winding arrangement, transformer, and method of manufacturing a winding arrangement of a transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP24382838.1A EP4687159A1 (en) 2024-07-30 2024-07-30 Winding arrangement, transformer, and method of manufacturing a winding arrangement of a transformer

Publications (1)

Publication Number Publication Date
EP4687159A1 true EP4687159A1 (en) 2026-02-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP24382838.1A Pending EP4687159A1 (en) 2024-07-30 2024-07-30 Winding arrangement, transformer, and method of manufacturing a winding arrangement of a transformer

Country Status (2)

Country Link
EP (1) EP4687159A1 (en)
WO (1) WO2026027199A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168617A (en) * 1983-03-15 1984-09-22 Toshiba Corp Foil wound transformer
JPH0662518U (en) * 1993-02-08 1994-09-02 日新電機株式会社 Gas insulated transformer
US20180053597A1 (en) * 2016-08-19 2018-02-22 Mitsubishi Electric Corporation Stationary induction apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168617A (en) * 1983-03-15 1984-09-22 Toshiba Corp Foil wound transformer
JPH0662518U (en) * 1993-02-08 1994-09-02 日新電機株式会社 Gas insulated transformer
US20180053597A1 (en) * 2016-08-19 2018-02-22 Mitsubishi Electric Corporation Stationary induction apparatus

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Publication number Publication date
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