WO2005027155A1 - A method of making a three-phase transformer with triangular core structure and a three-phase transformer with triangular core structure thereof - Google Patents

A method of making a three-phase transformer with triangular core structure and a three-phase transformer with triangular core structure thereof Download PDF

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Publication number
WO2005027155A1
WO2005027155A1 PCT/IN2004/000293 IN2004000293W WO2005027155A1 WO 2005027155 A1 WO2005027155 A1 WO 2005027155A1 IN 2004000293 W IN2004000293 W IN 2004000293W WO 2005027155 A1 WO2005027155 A1 WO 2005027155A1
Authority
WO
WIPO (PCT)
Prior art keywords
yoke
core structure
transformer
clamps
triangular core
Prior art date
Application number
PCT/IN2004/000293
Other languages
French (fr)
Inventor
Jai Ramesh Dasari
Kalahasty Sambamurthy
Original Assignee
Vijai Electricals Limited
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 Vijai Electricals Limited filed Critical Vijai Electricals Limited
Publication of WO2005027155A1 publication Critical patent/WO2005027155A1/en

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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
    • H01F27/24—Magnetic cores
    • H01F27/245—Magnetic cores made from sheets, e.g. grain-oriented
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/263—Fastening parts of the core together
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0233—Manufacturing of magnetic circuits made from sheets
    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers

Definitions

  • the invention relates to a method of making a three-phase transformer with triangular core structure and a three-phase transformer with triangular core structure thereof.
  • Conventional three phase transformers are made with cut laminations of high permeability material such as silicon steel forming a top yoke, a bottom yoke and three limbs in the same plane.
  • the wound coils with primary and secondary windings for each phase are inserted on each of said limbs to form the transformer.
  • the invention provides a three-phase transformer whose magnetic core is formed with trapezium shaped laminates of high permeability material.
  • the magnetic core consists of a triangular bottom yoke, an identical triangular top yoke and three limbs connecting the vertices of the triangular bottom yoke and triangular top yoke.
  • the magnetic core structure of such a transformer look like a triangle projected upwards.
  • the three-phase transformer made according to the invention uses reduced quantity of high permeability material in a particular transformer compared to that in a conventional three-phase transformer of the same rating.
  • the quantity of transformer oil and steel sheets used are also considerably less than that in a conventional three-phase transformer of equivalent rating.
  • the invention provides a method of manufacturing a transformer with a triangular core structure comprising the steps of cutting laminations in the shape of trapeziums with predetermined sizes from a high permeability sheet material; stacking the said trapezium shaped laminations to form the four sides of three rectangular frames to obtain a triangular core structure with a bottom yoke, top yoke and three vertical limbs connecting the three vertices of said bottom yoke and top yoke; clamping the said bottom yoke with clamps; removing the said top yoke and introducing three wound coils comprising primary and secondary windings through each vertical limb; replacing the said top yoke and clamping the same with clamps and clamping the bottom clamps and top clamps by tie-rods to obtain a transformer with a triangular core structure.
  • the invention also provides a transformer with a triangular core structure made by the method hereinabove described, comprising a triangular core structure made of high permeability laminations consisting of a triangular bottom yoke, a triangular top yoke and three vertical connecting limbs connecting the three vertices of the said bottom yoke and top yoke, a wound coil with primary and secondary windings for each phase around each vertical limb and clamps to hold the triangular core structure intact wherein the said bottom yoke, top yoke and vertical connecting limbs are formed with stacks of trapezium shaped laminations of high permeability.
  • Figure 1 shows the cutting lines in a strip of high permeability material to obtain trapezium shaped laminations.
  • Figure 2 shows a typical trapezium shaped lamination.
  • Figure 3 shows a rectangular frame formed by the trapezium shaped laminations shown in figure 2.
  • Figure 4 shows an isometric view of a stack of rectangular frames of laminations shown in figure 3.
  • Figure 6 shows a triangular core structure with clamps.
  • Figure 7 shows the wound coils with primary and secondary windings for each phase of the transformer.
  • Figure 8 shows the triangular core structure after removing the top yoke.
  • Figure 9 shows the triangular core structure shown in figure 8 with wound coils inserted on each vertical limb.
  • Figure 10 shows the triangular core structure shown in figure 9 with top yoke.
  • Figure 11 shows an isometric view of the assembled transformer with triangular core structure according to the invention.
  • Figure 12 shows the cross-sectional view of the assembled transformer with triangular core structure according to the invention.
  • Trapezium shaped laminations (2, 2') are cut from strip of high permiability material (1) along the cutting lines shown in figure 1.
  • the trapezium shaped laminations for forming bottom yoke (4) and top yoke (5) will be identical and the trapezium shaped laminations for forming each of the vertical limbs (6) will be identical.
  • These trapezium shaped laminations are held together to form a frame (3) and such frames (3) are stacked to form each side of a triangular core structure (7) with a bottom yoke (4), top yoke (5) and vertical limbs (6) at the vertices of said triangular core structure.
  • the triangular core structure is provided with bottom clamps (8) for holding the bottom yoke (4) and top clamps (9) for holding the top yoke (5). These bottom clamps (8) and top clamps (9) are held together by tie-rods (11). Wound coils (10) are made with primary and secondary windings in a conventional manner. The top yoke (5) is removed by removing the top clamps (9) and the wound coils (10) are introduced on each vertical limb (6). The top yoke (5) is replaced and clamped with top clamps (9). The bottom clamps (8) and top clamps are held together by tightening the tie rods (11) to complete the three phase transformer with triangular core structure.
  • the core structure of the transformer according to the invention is preferably made with laminations of cold rolled grain oriented high permeability material. However it can also be made from laminations obtained from thin film high permeability material or any other high permeability material.
  • the three-phase transformer according to the invention considerably reduces the quantity of high permeability material used resulting in reduced cost and reduced magnetic loss in the transformer.
  • the cost of steel sheets is also reduced.
  • the transformer according to the invention is more efficient and cost effective compared to conventional three phase transformers.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

The invention relates to a method of manufacturing a transformer with a triangular core structure and a transformer with triangular core structure. Laminations (2) are cut in the shape of trapeziums with predetermined sizes from a high permeability sheet material (1) and stacked to form the four sides of three rectangle frames (7) to obtain a triangular core structure with a bottom yoke (4), top yoke (5) and three vertical limbs (6). The three vertices of said bottom yoke and top yoke (5) are connected. The bottom yoke (4) is clamped with bottom clamps (8). The top yoke is removed and three wound coils (10) comprising primary and secondary windings are introduced through each vertical limb (6). The top yoke (5) is placed and clamped with top clamps (9). The bottom clamps (8) and top clamps (9) are clamped by tie rods (11) to obtain a transformer with a triangular core structure.

Description

AMETHOD OF MAKINGATHREE-PHASE TRANSFORMERWITH TRIANGULARCORE STRUCTUREAND A THREE-PHASE TRANSFORMERWITH TRIANGULARCORE STRUCTURETHEREOF
FIELD OF THEINVENTION
The invention relates to a method of making a three-phase transformer with triangular core structure and a three-phase transformer with triangular core structure thereof.
BACKGROUND OF THE INVENTION
Conventional three phase transformers are made with cut laminations of high permeability material such as silicon steel forming a top yoke, a bottom yoke and three limbs in the same plane. The wound coils with primary and secondary windings for each phase are inserted on each of said limbs to form the transformer.
The invention provides a three-phase transformer whose magnetic core is formed with trapezium shaped laminates of high permeability material. The magnetic core consists of a triangular bottom yoke, an identical triangular top yoke and three limbs connecting the vertices of the triangular bottom yoke and triangular top yoke. The magnetic core structure of such a transformer look like a triangle projected upwards.
The three-phase transformer made according to the invention uses reduced quantity of high permeability material in a particular transformer compared to that in a conventional three-phase transformer of the same rating. The quantity of transformer oil and steel sheets used are also considerably less than that in a conventional three-phase transformer of equivalent rating.
Thus the invention provides a method of manufacturing a transformer with a triangular core structure comprising the steps of cutting laminations in the shape of trapeziums with predetermined sizes from a high permeability sheet material; stacking the said trapezium shaped laminations to form the four sides of three rectangular frames to obtain a triangular core structure with a bottom yoke, top yoke and three vertical limbs connecting the three vertices of said bottom yoke and top yoke; clamping the said bottom yoke with clamps; removing the said top yoke and introducing three wound coils comprising primary and secondary windings through each vertical limb; replacing the said top yoke and clamping the same with clamps and clamping the bottom clamps and top clamps by tie-rods to obtain a transformer with a triangular core structure. The invention also provides a transformer with a triangular core structure made by the method hereinabove described, comprising a triangular core structure made of high permeability laminations consisting of a triangular bottom yoke, a triangular top yoke and three vertical connecting limbs connecting the three vertices of the said bottom yoke and top yoke, a wound coil with primary and secondary windings for each phase around each vertical limb and clamps to hold the triangular core structure intact wherein the said bottom yoke, top yoke and vertical connecting limbs are formed with stacks of trapezium shaped laminations of high permeability.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows the cutting lines in a strip of high permeability material to obtain trapezium shaped laminations.
Figure 2 shows a typical trapezium shaped lamination.
Figure 3 shows a rectangular frame formed by the trapezium shaped laminations shown in figure 2. Figure 4 shows an isometric view of a stack of rectangular frames of laminations shown in figure 3.
Figure 5 shows a triangular core structure assembled with three stacks of rectangular frames of laminations shown in figure 4.
Figure 6 shows a triangular core structure with clamps.
Figure 7 shows the wound coils with primary and secondary windings for each phase of the transformer.
Figure 8 shows the triangular core structure after removing the top yoke.
Figure 9 shows the triangular core structure shown in figure 8 with wound coils inserted on each vertical limb.
Figure 10 shows the triangular core structure shown in figure 9 with top yoke.
Figure 11 shows an isometric view of the assembled transformer with triangular core structure according to the invention. Figure 12 shows the cross-sectional view of the assembled transformer with triangular core structure according to the invention.
DETAILED DESCRIPTION
Trapezium shaped laminations (2, 2') are cut from strip of high permiability material (1) along the cutting lines shown in figure 1. The trapezium shaped laminations for forming bottom yoke (4) and top yoke (5) will be identical and the trapezium shaped laminations for forming each of the vertical limbs (6) will be identical. These trapezium shaped laminations are held together to form a frame (3) and such frames (3) are stacked to form each side of a triangular core structure (7) with a bottom yoke (4), top yoke (5) and vertical limbs (6) at the vertices of said triangular core structure. The triangular core structure is provided with bottom clamps (8) for holding the bottom yoke (4) and top clamps (9) for holding the top yoke (5). These bottom clamps (8) and top clamps (9) are held together by tie-rods (11). Wound coils (10) are made with primary and secondary windings in a conventional manner. The top yoke (5) is removed by removing the top clamps (9) and the wound coils (10) are introduced on each vertical limb (6). The top yoke (5) is replaced and clamped with top clamps (9). The bottom clamps (8) and top clamps are held together by tightening the tie rods (11) to complete the three phase transformer with triangular core structure. The core structure of the transformer according to the invention is preferably made with laminations of cold rolled grain oriented high permeability material. However it can also be made from laminations obtained from thin film high permeability material or any other high permeability material.
The three-phase transformer according to the invention considerably reduces the quantity of high permeability material used resulting in reduced cost and reduced magnetic loss in the transformer. The cost of steel sheets is also reduced. Thus the transformer according to the invention is more efficient and cost effective compared to conventional three phase transformers.

Claims

CLAIMS:
1. A method of manufacturing a transformer with a triangular core structure comprising the steps of cutting laminations (2) in the shape of trapeziums with predetermined sizes from a high permeability sheet material (1); stacking the said trapezium shaped laminations (2) to form the four sides of three rectangle frames (7) to obtain a triangular core structure with a bottom yoke (4), top yoke (5) and three vertical limbs (6) connecting the three vertices of said bottom yoke (4) and top yoke (5); clamping the said bottom yoke (4) with bottom clamps (8); removing the top yoke (5) and introducing three wound coils (10) comprising primary and secondary windings through each vertical limb (6); placing the said top yoke (5) and clamping the same with top clamps (9) and clamping the said bottom clamps (8) and top clamps (9) by tie rods (11) to obtain a transformer with a triangular core structure.
2. The method as claimed in claim 1, wherein said high permeability sheet material (1) from which the trapezium shaped laminations (2, 2') are cut is a cold rolled grain oriented high permeability sheet material.
3. The method as claimed in claim 1, wherein said trapezium shaped laminations (2') for the vertical limbs are cut with longer average length than the average length of the trapezium shaped laminations (2) for said top yoke (5) and bottom yoke (4).
4. The method as claimed in claim 1, wherein said trapezium shaped laminations (2, 2') are cut with equal width.
5. A transformer with a triangular core structure made by the method claimed in claim 1, comprising a triangular core structure made of high permiability laminations with a triangular bottom yoke (4), triangular top yoke (5) and vertical connecting limbs (6) connecting the vertices of said bottom yoke (4) and top yoke (5), three wound coils (10) around each said vertical limb (6) and clamps (8, 9) to hold the triangular core structure intact wherein said bottom yoke (4), top yoke (5) and the vertical connecting limbs (6) are stacks of trapezium shaped laminations of high permeability material.
6. The transformer as claimed in claim 5, wherein the said trapezium shaped laminations of high permeability material is cold rolled grain oriented high permeability sheet material. The transformer as claimed in claim 5, wherein the average length of trapezium shaped laminations in the vertical limbs (6) are longer than the average length of trapezium shaped laminations of said top yoke and bottom yoke.
PCT/IN2004/000293 2003-09-17 2004-09-16 A method of making a three-phase transformer with triangular core structure and a three-phase transformer with triangular core structure thereof WO2005027155A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN746CH2003 2003-09-17
IN746/CHE/2003 2003-09-17

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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011021156A1 (en) * 2009-08-18 2011-02-24 Panacis, Inc. Integrated multi-phase planar transformer
WO2011053358A1 (en) * 2009-10-29 2011-05-05 Vollrath Jurgen K Three phasecontinuous flux path transformer core and method of manufacture
CN102543381A (en) * 2012-01-19 2012-07-04 北京新特电气有限公司 Novel three-dimensional wound iron core transformer clamping part
CN102543369A (en) * 2010-12-28 2012-07-04 上海吴淞电气实业有限公司 Novel voltage transformer iron core and manufacturing method thereof
CN102969130A (en) * 2012-11-13 2013-03-13 新华都特种电气股份有限公司 Body structure of amorphous alloy stereoscopic wound core type transformer
WO2013063242A1 (en) * 2011-10-28 2013-05-02 Abb Technology Ag Integral mold for a transformer having a non-linear core
EP2618347A1 (en) * 2012-01-18 2013-07-24 ABB Technology AG Transformer-core
EP2618346A1 (en) * 2012-01-18 2013-07-24 ABB Technology AG Transformer-core
WO2013106994A1 (en) * 2012-01-17 2013-07-25 广东海鸿变压器有限公司 Open type stereoscopic triangle amorphous alloy reel iron core
CN103477404A (en) * 2010-12-03 2013-12-25 Abb技术有限公司 Non-linear transformer and method of manufacturing the same
EP2767990A1 (en) 2013-02-18 2014-08-20 ABB Technology AG Method for manufacturing a stacked triangular core transformer
CN105869830A (en) * 2016-05-12 2016-08-17 青岛云路新能源科技有限公司 Equivalent-magnetic-circuit full-powder-core high-frequency three-dimensional reactor
EP2919240A4 (en) * 2012-11-08 2016-11-02 Hitachi Industry Equipment Systems Co Ltd Reactor device
CN106298188A (en) * 2015-06-05 2017-01-04 齐会南 Collapsible open delta shaped iron core and technique
CN106449041A (en) * 2016-09-08 2017-02-22 特变电工股份有限公司 Three-phase three-dimensional laminated iron core, three-phase three-dimensional laminated iron core-based power transformer and assembling method
CN107808732A (en) * 2016-09-08 2018-03-16 发那科株式会社 Reactor
WO2020056938A1 (en) * 2018-09-17 2020-03-26 青岛云路先进材料技术股份有限公司 Assembly device for three-dimensional triangular iron core
WO2021048352A1 (en) * 2019-09-13 2021-03-18 Ionate Limited An electrical power transformation system and process
JP2023520272A (en) * 2021-01-11 2023-05-17 海鴻電気有限公司 Molded dry transformer and manufacturing method thereof
JP2023523482A (en) * 2021-04-09 2023-06-06 海鴻電気有限公司 Clamping device for three-dimensional wound core transformer and transformer
EP4102522A4 (en) * 2021-04-19 2023-09-27 Bilyi Leonid Adamovych Three-phase transformer

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DE1233936B (en) * 1960-11-09 1967-02-09 Paul Guichard Symmetrical magnetic core of the temple type for three-phase transformers
CH466421A (en) * 1966-08-05 1968-12-15 Schlatter Ernst Symmetrical three-phase core transformer and use of the transformer as a scatter transformer
DE4029097C2 (en) * 1990-09-13 2000-02-17 Messwandler Bau Ag Self-cooling three-phase dry transformer

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
DE1233936B (en) * 1960-11-09 1967-02-09 Paul Guichard Symmetrical magnetic core of the temple type for three-phase transformers
CH466421A (en) * 1966-08-05 1968-12-15 Schlatter Ernst Symmetrical three-phase core transformer and use of the transformer as a scatter transformer
DE4029097C2 (en) * 1990-09-13 2000-02-17 Messwandler Bau Ag Self-cooling three-phase dry transformer

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011021156A1 (en) * 2009-08-18 2011-02-24 Panacis, Inc. Integrated multi-phase planar transformer
WO2011053358A1 (en) * 2009-10-29 2011-05-05 Vollrath Jurgen K Three phasecontinuous flux path transformer core and method of manufacture
CN103477404A (en) * 2010-12-03 2013-12-25 Abb技术有限公司 Non-linear transformer and method of manufacturing the same
CN102543369A (en) * 2010-12-28 2012-07-04 上海吴淞电气实业有限公司 Novel voltage transformer iron core and manufacturing method thereof
CN103988268A (en) * 2011-10-28 2014-08-13 Abb技术有限公司 Integral mold for a transformer having a non-linear core
WO2013063242A1 (en) * 2011-10-28 2013-05-02 Abb Technology Ag Integral mold for a transformer having a non-linear core
US9190205B2 (en) 2011-10-28 2015-11-17 Abb Technology Ag Integral mold for a transformer having a non-linear core
WO2013106994A1 (en) * 2012-01-17 2013-07-25 广东海鸿变压器有限公司 Open type stereoscopic triangle amorphous alloy reel iron core
EP2618347A1 (en) * 2012-01-18 2013-07-24 ABB Technology AG Transformer-core
WO2013107481A1 (en) * 2012-01-18 2013-07-25 Abb Technology Ag Transformer-core
WO2013107480A1 (en) * 2012-01-18 2013-07-25 Abb Technology Ag Transformer-core
EP2618346A1 (en) * 2012-01-18 2013-07-24 ABB Technology AG Transformer-core
CN102543381A (en) * 2012-01-19 2012-07-04 北京新特电气有限公司 Novel three-dimensional wound iron core transformer clamping part
CN102543381B (en) * 2012-01-19 2014-08-13 北京新特电气有限公司 Novel three-dimensional wound iron core transformer clamping part
US9899135B2 (en) 2012-11-08 2018-02-20 Hitachi Industrial Equipment Systems Co., Ltd. Reactor device
EP2919240A4 (en) * 2012-11-08 2016-11-02 Hitachi Industry Equipment Systems Co Ltd Reactor device
CN102969130A (en) * 2012-11-13 2013-03-13 新华都特种电气股份有限公司 Body structure of amorphous alloy stereoscopic wound core type transformer
CN104981882A (en) * 2013-02-18 2015-10-14 Abb技术有限公司 Method for manufacturing a stacked triangular core transformer
EP2767990A1 (en) 2013-02-18 2014-08-20 ABB Technology AG Method for manufacturing a stacked triangular core transformer
US20160005536A1 (en) * 2013-02-18 2016-01-07 Abb Technology Ag Method for manufacturing a stacked triangular core transformer
WO2014124742A1 (en) 2013-02-18 2014-08-21 Abb Technology Ag Method for manufacturing a stacked triangular core transformer
RU2647862C2 (en) * 2013-02-18 2018-03-21 Абб Швайц Аг Method of manufacturing transformer with assembled triangular magnetic circuit
CN104981882B (en) * 2013-02-18 2017-04-19 Abb瑞士股份有限公司 Method for manufacturing a stacked triangular core transformer
CN106298188A (en) * 2015-06-05 2017-01-04 齐会南 Collapsible open delta shaped iron core and technique
CN105869830A (en) * 2016-05-12 2016-08-17 青岛云路新能源科技有限公司 Equivalent-magnetic-circuit full-powder-core high-frequency three-dimensional reactor
CN107808732A (en) * 2016-09-08 2018-03-16 发那科株式会社 Reactor
CN106449041A (en) * 2016-09-08 2017-02-22 特变电工股份有限公司 Three-phase three-dimensional laminated iron core, three-phase three-dimensional laminated iron core-based power transformer and assembling method
CN107808732B (en) * 2016-09-08 2021-04-23 发那科株式会社 Electric reactor
WO2020056938A1 (en) * 2018-09-17 2020-03-26 青岛云路先进材料技术股份有限公司 Assembly device for three-dimensional triangular iron core
US11450478B2 (en) 2018-09-17 2022-09-20 Qingdao Yunlu Advanced Materials Technology Co., Ltd. Assembly device for three-dimensional triangular iron core
WO2021048352A1 (en) * 2019-09-13 2021-03-18 Ionate Limited An electrical power transformation system and process
JP2023520272A (en) * 2021-01-11 2023-05-17 海鴻電気有限公司 Molded dry transformer and manufacturing method thereof
JP2023523482A (en) * 2021-04-09 2023-06-06 海鴻電気有限公司 Clamping device for three-dimensional wound core transformer and transformer
EP4102522A4 (en) * 2021-04-19 2023-09-27 Bilyi Leonid Adamovych Three-phase transformer

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