WO2013015701A1 - Noyau magnétique en delta - Google Patents

Noyau magnétique en delta Download PDF

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Publication number
WO2013015701A1
WO2013015701A1 PCT/RS2012/000012 RS2012000012W WO2013015701A1 WO 2013015701 A1 WO2013015701 A1 WO 2013015701A1 RS 2012000012 W RS2012000012 W RS 2012000012W WO 2013015701 A1 WO2013015701 A1 WO 2013015701A1
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WO
WIPO (PCT)
Prior art keywords
packages
package
circumcircle
edges
hank
Prior art date
Application number
PCT/RS2012/000012
Other languages
English (en)
Inventor
Ivan PEJCIC
Original Assignee
Pejcic Ivan
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 Pejcic Ivan filed Critical Pejcic Ivan
Publication of WO2013015701A1 publication Critical patent/WO2013015701A1/fr

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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
    • H01F27/25—Magnetic cores made from strips or ribbons
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/04—Cores, Yokes, or armatures made from strips or ribbons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits

Definitions

  • This invention belongs to the group of basic electrical elements, more' precisely in the field of three-phase transformers.
  • the technical problem solved is how to construct three phase delta magnetic core by winding standard width ferromagnetic tapes using single axis controlled machines, with negligible material deformations, without any industrial material waste, and with a stacking factor higher than 90 %.
  • Three-phase transformers belong to the group of standard electrical elements and they basically consist of magnetic core and three pairs of primary and secondary wound coils.
  • Three-phase transformer magnetic core is usually made out of transformer sheets - Steel with a high content of silica, produced in thin plates.
  • E-core In the production of three-phase transformers, the most common used type of magnetic core is E-core which is made by combining a large number of specially cut pieces of transformer steel.
  • E-core has three limbs mutually connected by four yokes, where one limb and two yokes belong to each outer phase and one limb belongs to the middle phase.
  • Outer limbs are made out of trapezo id-shaped metal tapes cut under 45 degrees angle
  • the middle limb is made out of double arrow-shaped metal tapes with 90 ° angle
  • two pairs of two adjacent yokes are made out of metal tapes with V-shaped cutout in the middle.
  • Transformer phases have unequal mutual relations because they are spatially distributed in a way that the magnetic fluxes of the outer phases and a middle phase are crossing paths of different length.
  • This l property of three-phase electrical transformer introduces asymmetry in transmission lines and to the electricity consumers.
  • Magnetic E-core of such a three-phase transformer has several thousand parts, process of cutting metal tapes produces more than 5% waste, extreme accuracy is necessary during cutting and stacking process, and special fastening process is involved in formation of the structure.
  • Three-phase delta magnetic cores have three limbs situated in apexes of an equilateral triangle. Each limb has four half yokes and each limb is connected to the other two limbs of magnetic core by two pairs of yokes. This symmetrical relationship of one phase to the other two phases results in a completely symmetrical three-phase magnetic system.
  • the delta magnetic core is used rarely because of the very complicated production process.
  • Wound magnetic cores of any electrical machine have the following advantages over the cut and stacked ones: lower material consumption, lower magnetizing currents, and no material waste production.
  • French patent FR 2518306 provides a solution for the magnetic core of a three-phase delta transformer which has extremely complicated structure, including special connection rings that link all the three limbs together.
  • U.S. Patent U.S. 6,683,524 B l provides a solution for wound three-phase delta magnetic core, which represents relevant prior invention.
  • the difference between these two is in the type of iron tapes used, the degree of fulfillment of the circle at the intersection of the limb, and large material deformation due to twisting at the spot of hank intersection.
  • the basic limb form in this solution apart from the 26 even more complicated listed in the patent, has a shape of hexagon, and has 0.827699 times the surface area of ideal circle.
  • Delta magnetic core consists of three identical rectangular hanks, connected by touching the analog sides that form three-phase transformer limbs, and the remaining two hank sides are fit at an angle of 60 degrees with the analog sides of the hank and form the three-phase transformer yokes, and each hank consists of several packages with rectangular cross-section, made by winding tapes of uniform width, and each package, except the first one, has a shifted outer edge compared to the previous package, and the outer edges of the first few packages are constrained by the circumcircle, and the inner edges of the other packages lie in the plane inclined at 30 degrees to the perpendicular of winding axis and the opposite outer edges of those packages touch the circumcircle of delta core limb, and when two hanks are combined by leaning two inclined planes, a limb of one phase, two semi limbs and two pairs of yokes at angles of 60 degrees are formed, and adding a third hank forms delta core with three limbs connected by six yokes, and cross
  • the advantage of this construction is the increased stacking factor achieved by choosing the optimal width and thickness of each package.
  • This construction is manufactured using simple single axis controlled machines, applying minimum tightening during winding process.
  • the tapes are situated exactly one above the other without any torsional stress, and there is no need for subsequent heating of the core.
  • Rhomboid channels along the plane connecting the two hanks contribute to additional core cooling. Because of that, large power transformer units avoid the insertion of additional channels that otherwise reduce the stacking factor.
  • the outer edges of notched circle are slighter, and contribute to the easier rolling process of the coils, compared to the known solution containing very sharp outer edges.
  • Figure 1 shows two projections indicating the intersection of delta magnetic core according to this invention
  • Figure 2 shows three-dimensional appearance of delta magnetic core, with the cross section of one limb included; - hank
  • Figure 3 shows a detailed hank cross-section with packages made out of wound ferromagnetic tapes.
  • x, y - Descartes rectangular coordinate system axis
  • Figure 1 CROSS SECTION CC consists of three hanks K. connected along the surfaces S, which indicates that the entire delta magnetic core is composed out of three identical hanks K.
  • Hank K is made by winding ferromagnetic tape packages according to Figure 3.
  • First package Pi Figure 3 is wound with ferromagnetic tapes of width wi till package height reaches hi which is equal to h
  • the width Wi of this tape is chosen as the most suitable one of the available tape widths smaller than d / 2.
  • the thickness of layers hi of the package Pi is determ ined by setting the chord of length wi to a circle d Figure 3, such that its x-axis is centerline and thus defines the lowest value of the abscissa x, which is the position of the left side of package, and right side of the package P
  • is in the abscissa values (-d/2) * cos30°.
  • the next package P 2 is made by continuing the winding process of tape of width w 2 and height h 2 by choosing the most suitable one of the available tape widths smaller than d / 2, and according to Figure 3 is placed along the line w 2 , next to the right side of the package Pi, while still touching the circle of diameter d by its upper point.
  • Drawing a horizontal line from the bottom point of line w 2 up to the intersection point with axis S Figure 3 gives an abscissa value for the ending of second package and beginning of third one.
  • Drawing a vertical line of length w 2 from right side of package P 2 becomes rectangular package P 2 Figure 3.
  • the absolute difference in ordinate y values between lower edges of packages Pi and P 2 Figure 3 is the value of margin m 2 Figure 3.
  • tape widths are elected by the availability if they are greater than or equal to d / 2 and less than 0,57 * d, and they are made in the same way as the package P 2 . So the rule is to construct a rectangle of width Wj and with the left side placed along the right side of the previous package, with the top left corner touching circle of diameter d / 2 Figure 3 and the lower right corner is obtained by dragging the horizontal from the lower left corner to the intersection with the line S Figure 3 which goes through the center of the circle of diameter d, under the angle of 30 degrees with x axis Figure 3.
  • the absolute difference in ordinate y values between lower edges of packages Pi and P 2 Figure 3 is the value of margin m 2 Figure 3.
  • tape widths are chosen to be less than d / 2.
  • the right side of the package is determined by the width Wj and placed parallel to the y axis so that the top point touches the circle of diameter d, and the bottom point touches the line S Figure 3.
  • height of package P is determined as abscissa difference between the right side of the package i and the right side of package i- 1.
  • the absolute difference in ordinate y values between lower edges of packages P, and Pj_i Figure 3 is the value of margin mj Figure 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

Selon l'invention, par enroulement de paquets successifs P1, P2, P3…Pi…Pn (Figure 3) avec des débuts décalés par comparaison aux marges précédentes m2, m3…mi…mn (Figure 3) sur la base rectangulaire arrondie AxB/R (Figure 1) de bandes de différentes largeurs w1, w2, w3…wi…wn (Figure 3) en des hauteurs de paquet h1, h2, h3…hi…hn (Figure 3), un écheveau rectangulaire K (Figure 1) est fabriqué avec une section droite en demi-cercle cranté de diamètre d (Figure 3), des bords latéraux de paquets P1, P2, P3…Pi…Pn (Figure 3) étant faits de manière à ce que quelques premiers paquets soient retenus par le cercle circonscrit et les bords internes des autres paquets se trouvent dans le plan incliné à 30 degrés de la perpendiculaire de l'axe d'enroulement et les bords externes opposés des paquets touchent le cercle circonscrit de base AxB/R (Figure 1) de diamètre d(Figure 3), et par connexion de trois écheveaux identiques K (Figure 1) par des plans inclinés S (Figure 1), un noyau magnétique en delta (Figure 2) est fabriqué.
PCT/RS2012/000012 2011-07-22 2012-06-07 Noyau magnétique en delta WO2013015701A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RSP-2011/329 2011-07-22
RS20110329A RS52864B (en) 2011-07-22 2011-07-22 DELTA MAGNETIC CORE THREE-PHASE TRANSFORMER

Publications (1)

Publication Number Publication Date
WO2013015701A1 true WO2013015701A1 (fr) 2013-01-31

Family

ID=47601341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RS2012/000012 WO2013015701A1 (fr) 2011-07-22 2012-06-07 Noyau magnétique en delta

Country Status (2)

Country Link
RS (1) RS52864B (fr)
WO (1) WO2013015701A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104319078A (zh) * 2014-10-11 2015-01-28 海鸿电气有限公司 一种110kV及以上电压等级立体卷铁心变压器及其绕制工艺
CN105185571A (zh) * 2015-07-16 2015-12-23 王立华 立体三角卷铁芯变压器的双头绕线方法及双头卧式绕线机
CN106783061A (zh) * 2015-11-19 2017-05-31 齐侠 一种截面六边形的折叠式立体三角形变压器开口卷铁芯

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB499010A (en) * 1937-07-01 1939-01-17 British Thomson Houston Co Ltd Improvements in and relating to electric transformers
US2401952A (en) * 1943-09-10 1946-06-11 Line Material Co Three-phase transformer
NL7505363A (nl) * 1974-10-07 1976-04-09 Ingenieria Electrica Ind Sa Magnetische keten voor elektrische drie-fasige transformator.
FR2518306A1 (fr) 1981-12-11 1983-06-17 Transfix Soc Nouv Transformateur electrique et procede pour sa fabrication
US4557039A (en) * 1979-10-19 1985-12-10 Susan V. Manderson Method of manufacturing transformer cores
WO2001065572A2 (fr) * 2000-03-02 2001-09-07 Hoeglund Lennart Noyau de transformateur
US6683524B1 (en) 1998-09-02 2004-01-27 Hoeglund Lennart Transformer core
WO2010027290A1 (fr) * 2008-09-05 2010-03-11 Abs Minel-Trafo, Ad-Joint Stock Company Noyau magnetique en delta bobine pour transformateur triphase
WO2011053358A1 (fr) * 2009-10-29 2011-05-05 Vollrath Jurgen K Noyau de transformateur à trajet de flux continu triphasé et procédé de fabrication

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB499010A (en) * 1937-07-01 1939-01-17 British Thomson Houston Co Ltd Improvements in and relating to electric transformers
US2401952A (en) * 1943-09-10 1946-06-11 Line Material Co Three-phase transformer
NL7505363A (nl) * 1974-10-07 1976-04-09 Ingenieria Electrica Ind Sa Magnetische keten voor elektrische drie-fasige transformator.
US4557039A (en) * 1979-10-19 1985-12-10 Susan V. Manderson Method of manufacturing transformer cores
FR2518306A1 (fr) 1981-12-11 1983-06-17 Transfix Soc Nouv Transformateur electrique et procede pour sa fabrication
US6683524B1 (en) 1998-09-02 2004-01-27 Hoeglund Lennart Transformer core
WO2001065572A2 (fr) * 2000-03-02 2001-09-07 Hoeglund Lennart Noyau de transformateur
WO2010027290A1 (fr) * 2008-09-05 2010-03-11 Abs Minel-Trafo, Ad-Joint Stock Company Noyau magnetique en delta bobine pour transformateur triphase
WO2011053358A1 (fr) * 2009-10-29 2011-05-05 Vollrath Jurgen K Noyau de transformateur à trajet de flux continu triphasé et procédé de fabrication

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104319078A (zh) * 2014-10-11 2015-01-28 海鸿电气有限公司 一种110kV及以上电压等级立体卷铁心变压器及其绕制工艺
CN105185571A (zh) * 2015-07-16 2015-12-23 王立华 立体三角卷铁芯变压器的双头绕线方法及双头卧式绕线机
CN106783061A (zh) * 2015-11-19 2017-05-31 齐侠 一种截面六边形的折叠式立体三角形变压器开口卷铁芯

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Publication number Publication date
RS52864B (en) 2013-12-31
RS20110329A1 (en) 2013-02-28

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