WO2012177399A1 - Configuration de noyau de transformateur à coupe radiale pour culasse en gradin et jambe centrale - Google Patents

Configuration de noyau de transformateur à coupe radiale pour culasse en gradin et jambe centrale Download PDF

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Publication number
WO2012177399A1
WO2012177399A1 PCT/US2012/041195 US2012041195W WO2012177399A1 WO 2012177399 A1 WO2012177399 A1 WO 2012177399A1 US 2012041195 W US2012041195 W US 2012041195W WO 2012177399 A1 WO2012177399 A1 WO 2012177399A1
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WO
WIPO (PCT)
Prior art keywords
plates
arc
yoke
lower yoke
leg
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.)
Ceased
Application number
PCT/US2012/041195
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English (en)
Inventor
Charlie H. SAVER
William E. Pauley
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.)
ABB Technology AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Publication of WO2012177399A1 publication Critical patent/WO2012177399A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to transformers and more particularly, to transformers having a stacked core and methods of making the same with reduced waste and improved core performance.
  • a stacked transformer core is comprised of thin metallic laminate plates, such as grain oriented silicon steel. This type of material is used because the grain of the steel may be groomed in certain directions to reduce the magnetic field loss.
  • the plates are stacked on top of each other to form a plurality of layers.
  • a stacked core is typically rectangular in shape and can have a rectangular or cruciform cross-section.
  • a front view of a conventional three leg stacked core 1 0 for a three phase transformer is shown in FIG. 1 .
  • the core 1 0 comprises an upper yoke 12, a lower yoke 14, an inner leg 16, and first and second outer legs 18, 20.
  • a pair of windows 22 are disposed between the inner leg 1 6 and the first and second outer legs 18, 20, respectively.
  • Wire coils (not shown) are mounted to the inner leg 16 and the first and second outer legs 1 8, 20, respectively.
  • the upper yoke 12 comprises a stack of plates 24, the lower yoke 14 comprises a stack of steel plates 26, the first outer leg 18 comprises a stack of plates 28 and the second outer leg 20 comprises a stack of plates 30.
  • the plates 24, 26 of the upper and lower yokes 12, 14 have opposing ends that form joints with opposing ends of the plates 28, 30 of the first and second outer legs 1 8, 20, respectively.
  • a V-shaped upper notch 32 is formed in each of the plates 24 of the upper yoke 12 and a V-shaped lower notch 36 is formed in each of the plates 26 of the lower yoke 14.
  • the upper notches 32 form an upper groove 38 in the upper yoke 12, while the lower notches 36 form a lower groove 40 in the lower yoke 14.
  • the size of the individual plates 24-30 vary depending on the stacking technique used to assemble the core 1 0.
  • the inner leg 1 6 comprises a stack of plates 42.
  • Each of the plates 42 has an upper tined end 42a formed by a pair of miter cuts and a lower tined end 42b formed by a pair of miter cuts.
  • the upper and lower tined ends 42a, b of the plates 42 provide the inner leg 1 6 with upper and lower tined ends 1 6a, b, which are adapted for receipt in the upper and lower grooves 38, 40 of the upper and lower yokes 1 2, 1 4, respectively.
  • An object of the invention is to fulfill the need referred to above.
  • this objective is achieved by providing a transformer core including a plurality of first and second outer leg plates, a plurality of inner leg plates, each having opposing, arc-shaped ends, and a plurality of upper yoke plates and a plurality of lower yoke plates.
  • Each of the upper and lower yoke plates has an outer side and an inner side with an arc- shaped notch formed in the inner side.
  • the inner leg plates, the upper and lower yoke plates, and the first and second outer leg plates are joined to form first and second outer legs from the first and second outer leg plates, respectively; an upper yoke and a lower yoke from the upper and lower yoke plates, respectively; and a central leg from the inner leg plates, with each arc-shaped end of the inner leg plates being joined with an associated arc-shaped notch of each of the upper and lower yoke plates.
  • a method of making a core for a transformer provides a plurality of first and second outer leg plates; a plurality of inner leg plates, each having opposing, arc-shaped ends; and a plurality of upper yoke plates and a plurality of lower yoke plates.
  • Each of the upper and lower yoke plates has an outer side and an inner side with an arc- shaped notch formed in the inner side.
  • the method joins the inner leg plates, the upper and lower yoke plates and the first and second outer leg plates to form first and second outer legs from the first and second outer leg plates, respectively; an upper yoke and a lower yoke from the upper and lower yoke plates, respectively; and a central leg from the inner leg plates, with each arc-shaped end of the inner leg plates being joined with an associated arc-shaped notch of each of the upper and lower yoke plates.
  • FIG. 1 shows a front elevational view of a prior art transformer core.
  • FIG. 2 shows a front elevational view of a transformer core constructed in accordance with an embodiment of the invention.
  • FIG. 3 shows an enlarged view of a portion of central leg of the core of FIG. 2, shown spaced above a lower yoke.
  • a core 100 is shown for a transformer, such as a distribution transformer.
  • the transformer may be an oil-filled transformer, i.e., cooled by oil, or a dry-type transformer, i.e., cooled by air.
  • the core 100 has a rectangular shape and generally comprises an upper yoke 102, a lower yoke 104, first and second outer legs 106, 108 and a central leg 110 disposed generally centrally between the outer legs. Upper ends of the first and second outer legs 106, 108 are connected to first and second ends of the upper yoke 102, respectively, while lower ends of the first and second outer legs 106, 108 are connected to first and second ends of the lower yoke 104.
  • the central leg 110 is disposed about midway between the first and second outer legs 106, 108 and has an upper end connected to the upper yoke 102 and a lower end connected to the lower yoke 104. With this construction, two windows 112 are formed between the central leg 110 and the first and second outer legs 106, 108.
  • the upper yoke 102 has an inner side 102a and an outer side 102b, and the lower yoke 104 has an inner side 104a and an outer side 104b.
  • the upper yoke 102 comprises a stack of yoke plates 114, while the lower yoke 104 comprises a stack of yoke plates 116. Both the plates 114 and the plates 116 are arranged in groups. In one exemplary embodiment of the present invention, the groups are groups of seven, but for ease of illustration, four groups are shown and described herein. Of course, groups of different numbers may be used.
  • Each of the plates 114, 116 is composed of grain-oriented silicon steel and has a thickness in a range of from about 7 mils to about 14 mils, with the particular thickness being selected based on the application of the transformer.
  • the plates 114, 116 each have a unitary construction and are trapezoidal in shape. In each of the plates 114, 116, opposing ends of the plate 114, 116 are mitered at oppositely-directed angles of about 45 degrees thereby providing the plate 114, 116 with major and minor side edges.
  • the plates 114 have the same width to provide the upper yoke 102 with a rectangular cross-section and the plates 116 have the same width to provide the lower yoke 104 with a rectangular cross-section.
  • the lengths of the plates 114 are not all the same and the lengths of the plates 116 are not all the same. More specifically, the lengths within each group of plates 114 are different and the lengths within each group of plates 116 are different.
  • the pattern of different lengths is the same for each group of plates 114 and the pattern of different lengths is the same for each group of plates 116.
  • the difference in lengths within each group permits the formation of multi-step lap joints with plates 118, 120 of the first and second outer legs 106, 108.
  • an upper arc-shaped notch 122 is formed in each inner side 102a of the plates 114 of the upper yoke 102 and an arc-shaped lower notch 124 is formed in each inner side 104a of the plates 116 of the lower yoke 104.
  • the upper interior edges 126 (defining the notches 122) in adjacent plates 114 of the upper yoke 102 have different depths for forming vertical lap joints with upper ends 127 of inner leg plates 128 of the central inner leg 110, as will be described more fully below.
  • the lower interior edges 130 in adjacent plates 116 -116c of the lower yoke 104 have different depths for forming vertical lap joints with lower ends 129 of the inner leg plates 128 of the central leg 110, as will be described more fully below.
  • the first outer leg 106 comprises a stack of the plates 118
  • the second outer leg 108 comprises a stack of the plates 120.
  • Both the plates 118 and the plates 120 are arranged in groups of the same number as the plates 114, 116.
  • Each of the plates 118, 120 is composed of grain-oriented silicon steel and has a thickness in a range of from about 7 mils to about 14 mils, with the particular thickness being selected based on the application of the transformer.
  • the plates 118, 120 each have a unitary construction and are trapezoidal in shape. In each of the plates 118, 120, opposing ends of the plate are mitered at oppositely- directed angles of about 45 degrees, thereby providing the plate 118, 120 with major and minor side edges.
  • the plates 118 have the same width to provide the first outer leg 106 with a rectangular cross-section and the plates 120 have the same width to provide the second outer leg 108 with a rectangular cross-section.
  • the lengths of the plates 118 are not all the same and the lengths of the plates 120 are not all the same. More specifically, the lengths within each group of plates 118 are different and the lengths within each group of plates 120 are different.
  • the pattern of different lengths is the same for each group of plates 118 and the pattern of different lengths is the same for each group of plates 120. The difference in lengths within each group permits the formation of the multi- step joints with the plates 114, 116 of the upper and lower yokes 102, 104, as will be described more fully below.
  • FIG.3 there is shown an enlarged view of a portion of the lower end of the central leg 110 spaced from the lower yoke 104.
  • the convex arc-shaped ends 129 of first, second, third and fourth inner leg plates 128, 128a, 128b and 128c abut (form joints with) the concave arc-shaped lower interior edges 130 of first, second, third and fourth plates 116, 116a, 116b, and 116c of the lower yoke 104, respectively.
  • the first through fourth inner leg plates 128-128c are vertically offset such that lower ends thereof are located successively farther downward.
  • the lower interior edges of the plates 116-116c are cut successively deeper.
  • the first plate 116 overlaps the joints between the second inner leg plates 128a and the second plate 116a
  • the second plate 116a overlaps the joints between the third inner leg plates 128b and the third plate 116b
  • the third plate 116b overlaps the joints between the fourth inner leg plates 128cd and the fourth plate 116c.
  • additional groups of the plates 116 and inner leg plates 128 are provided and repeat the pattern of the first through fourth plates 128-128c and the first through fourth plates 116-116c. In this manner, multi-step lap joints are formed between the plates 116 of the lower yoke 104 and the inner leg plates 128, with plates 116 of the lower yoke 104 overlapping plates 128.
  • the inner leg plates 1 28 may be offset differently so as to have plates 1 1 4 of the upper yoke 1 02 overlapping inner leg plates 1 28, and inner leg plates 128 overlapping plates 1 1 6 of the lower yoke 1 04.
  • the inner leg plates 1 28 may be offset to form a seven or other number step lap joint pattern, instead of the four step lap joint pattern.
  • Plates of the first and second outer legs 1 06, 108 are joined in a multi-step lap joint arrangement with plates the upper and lower yokes 1 02, 1 04 in a manner similar to the joining of the central yoke 1 1 0 to the upper and lower yokes 102, 1 04, described above.
  • Such joining of the outer legs 1 06, 1 08 is described in U.S. Patent No. 7,877,861 B2, the content of which is hereby incorporated by reference into this specification.
  • each arc-shaped notch 1 22, 1 24 is a continuous cut-out defined by a continuous arc between points 1 32 that intersect with the associated inner side 1 04a the yoke plate 1 1 6 (FIG. 3).
  • the size of the arc or radius in the plates 128 of the central leg 1 1 0 and the mating arc or radius of the plates 1 14, 1 1 6 in the upper and lower yokes 1 02, 1 04, respectively, is selected based on the width of the steel plates. Core steel scrap is reduced by using the radius or arc cut into the upper and lower yokes, as compared to the V-notch used in the prior art configuration of FIG. 1 .

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

Abstract

La présente invention concerne un noyau de transformateur comprenant une pluralité de premières et de secondes plaques de jambe extérieures (106, 108), une pluralité de plaques de jambe intérieures (110), chacune présentant des extrémités opposées en forme d'arc (122, 124) et une pluralité de plaques de culasse supérieures et une pluralité de plaques de culasse inférieures (102, 104). Chacune des plaques de culasse supérieures et inférieures présente un côté extérieur et un côté intérieur dotés d'une encoche en forme d'arc formée dans le côté intérieur (129, 130). Les plaques de jambe intérieures, les plaques de culasse supérieure et inférieure et les première et seconde plaques de jambe extérieures sont reliées pour former des première et des seconde jambes extérieures partant des première et seconde plaques de jambe extérieures, respectivement ; une culasse supérieure et une culasse inférieure partant des plaques de culasse supérieure et inférieure, respectivement ; et une jambe centrale partant des plaques de jambe intérieures, chaque extrémité en forme d'arc des plaques de jambe intérieures étant reliée à une encoche en forme d'arc associée de chacune des plaques de culasse supérieure et inférieure.
PCT/US2012/041195 2011-06-23 2012-06-07 Configuration de noyau de transformateur à coupe radiale pour culasse en gradin et jambe centrale Ceased WO2012177399A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201161500231P 2011-06-23 2011-06-23
US61/500,231 2011-06-23

Publications (1)

Publication Number Publication Date
WO2012177399A1 true WO2012177399A1 (fr) 2012-12-27

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PCT/US2012/041195 Ceased WO2012177399A1 (fr) 2011-06-23 2012-06-07 Configuration de noyau de transformateur à coupe radiale pour culasse en gradin et jambe centrale

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1053096B (de) * 1956-03-07 1959-03-19 Siemens Ag Zusammenhaengendes Kernblech mit mindestens einem Fenster zur Schichtung von Metallkernen fuer Transformatoren und Drosseln, insbesondere Magnetverstaerker
US4158186A (en) * 1976-10-30 1979-06-12 Bernhard Philberth Core lamination for shell-type cores, particularly for transformers
US20060244562A1 (en) * 2005-04-28 2006-11-02 Tyco Electronics Corporation Electrical Transformers and assemblies
JP2010258365A (ja) * 2009-04-28 2010-11-11 Nippon Steel Corp 電力機器用鉄心
US7877861B2 (en) 2005-03-30 2011-02-01 Abb Technology Ag Method of making a transformer having a stacked core with a split leg

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1053096B (de) * 1956-03-07 1959-03-19 Siemens Ag Zusammenhaengendes Kernblech mit mindestens einem Fenster zur Schichtung von Metallkernen fuer Transformatoren und Drosseln, insbesondere Magnetverstaerker
US4158186A (en) * 1976-10-30 1979-06-12 Bernhard Philberth Core lamination for shell-type cores, particularly for transformers
US7877861B2 (en) 2005-03-30 2011-02-01 Abb Technology Ag Method of making a transformer having a stacked core with a split leg
US20060244562A1 (en) * 2005-04-28 2006-11-02 Tyco Electronics Corporation Electrical Transformers and assemblies
JP2010258365A (ja) * 2009-04-28 2010-11-11 Nippon Steel Corp 電力機器用鉄心

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