US2761107A - Three-phase transformer core - Google Patents

Three-phase transformer core Download PDF

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Publication number
US2761107A
US2761107A US336285A US33628553A US2761107A US 2761107 A US2761107 A US 2761107A US 336285 A US336285 A US 336285A US 33628553 A US33628553 A US 33628553A US 2761107 A US2761107 A US 2761107A
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US
United States
Prior art keywords
core
core sections
sections
legs
phase transformer
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.)
Expired - Lifetime
Application number
US336285A
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English (en)
Inventor
Elias K Kane
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US336285A priority Critical patent/US2761107A/en
Priority to CH320517D priority patent/CH320517A/de
Priority to DEG13720A priority patent/DE1061891B/de
Application granted granted Critical
Publication of US2761107A publication Critical patent/US2761107A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/25—Magnetic cores made from strips or ribbons

Definitions

  • a conventional form of three-phase transformer core the three-legged construction, consists of la laminated structure built up out of narrow flat plates.
  • the plates comprise the leg and yoke portions and the plates comprising each lamination are arranged in va rectangular-like conguration with two window openings and a plurality of laminations are stacked together.
  • This form of threephase core construction has a considerable height dimension and in order to reduce the height of three-phase core constructions the live-legged core was developed.
  • a known form of live-legged core consists of four rectangular-like core sections lying in the same plane and abutting each other side by side.
  • This form of three-phase transformer :core has a shorter height than the three-legged type. However, the length dimension is increased in order to decrease the height.
  • An object of this invention is to decrease the length dimension of the conventional live-legged three-phase transformer core.
  • my invention consists of substituting for each of the endmost core sections two smaller rectangular-like core sections disposed relative to each other in a V-shaped arrangement, lying on opposite sides of said plane, and disposed equidistantly from said plane, the apexes of said V-shaped arrangements pointing towards each other.
  • Figure 1 is a sectional view of one form of my invention wherein the rectangular-like core sections are constructed out of tapered magnetic core strip material, the section being taken along the line 1--1 of Figure 2.
  • Figure 2 is a front view of my said one form of invention.
  • Figure 3 is a sectional view of another form of my invention wherein the rectangular-like core sections are constructed out of stepped magnetic core strip material, the section being taken along the line 3--3 of Figure 4.
  • Figure 4 is a front view of said another form of invention.
  • FIG. 1 and 2 of the drawings shown therein are three conventional electrical winding cylinders l, 2, and 3.
  • Each of the cylinders 1 to 3 comprise primary windings 16 and secondary windings 17.
  • My novel three-phase magnetic core consists of six rectangular-like core sections 4, 5, 6, 7, 8, and 9. Large core sections 6 and 7 abut each other at one of their vertical legs or sides and lie in substantially the same plane.
  • core section 6 is looped through cylinders 1 and 2 so that a vertical leg of said .l necessarily be 90 degrees core section is positioned within each of said cylinders
  • 'and core section 7 is looped through cylinders 2 and 3 so that :a vertical leg of said section 7 is positioned within each of said cylinders 2 and 3.
  • I in order to reduce the length dimension of the conventional live-legged core, I substitute two small end core sections for each of the endmost core sections of the conventional ve-legged core, each of said two small core sections being disposed relative to each other at an angle, and lying on opposite sides of said plane and spaced equidistantly therefrom.
  • the Iapexes of the angles formed by both pairs of small end core sections are directed towards each other.
  • end core sections 4 and 5 are identical to end core sections 8 and 9, so a description of one pair of small core end sections will be equally applicable to the other pair.
  • Small core end sections 4 and 5 abut each other at one of their vert-ical legs and these two vertical abutting legs abut the vertical leg of core section 6 within cylinder 1.
  • the pair of end core sections 4 and 5 ' are disposed relative to each other in a V-shaped arrangement or at lan angle, and lie on opposite sides of the central vertical plane of large or main core sections 6 and 7. The apex of said V-shaped arrangement or angle is pointed towards the transformer core.
  • core sections 4 and 5 are disposed substantially equidistantly from the central vertical plane of core sections 6 land 7. That is, each of the core sections 4 and 5 flare or diverge away from the central vertical plane of the whole core structure 'at substantially equal angles.
  • the angle at which the end core sections are disposed relative to each other is shown in Figure l as being approximately degrees. However, this angle need not but can obviously be varied. In my preferred embodiments this 'angle is 90 degrees because then the length dimension of the conventional fivelegged three phase transformer core is substantially decreased without a concomitant substantial increase in the width dimension of transformer apparatus embodying my invention.
  • 'Ihe tnansformer apparatus comprising the core 'and electrical windings is housed in a tank.
  • Transformer Iapparatus embodying my invention can be housed in a tank having about the same width as a tank housing conventional three-phase transformer apparatus having a live-legged core.
  • the legs of all six core sections 4 to 9 have equal lengths and the yokes of the small core sections 4, 5, 8 and 9 have :a length less than that of the yokes of the large core sections 6 and 7.
  • the cross sectional area of the 'legs of the small core sections is about one-half the cross sectional area of the legs of the large core sections.
  • the window openings of the small core sections is about one-half the size of the window openings of the large core sections. That is the outer legs of the small core sections 4 and 5 and 8 and 9 are disposed closely along the outer circumference of the cylinders 1 and 43 respectively.
  • the core material positioned within each of the winding cylinders 1, 2, and 3 has a circular outline. That is, the proportion of core metal within the cylinders as compared to the cylindrical tubular space within the cylinders is very high.
  • This high space factor is attained by constructing the various core sections from a core strip material that is tapered.
  • the core sections 6 and 7 are each constructed from a tapered strip that is narrowest lat one end and widest at the other end. After core sections 6 and 7 are assembled the narrower portions of the core material are located lat the inner circumference of the rectangular-like core sections, and the widest portions are located at the outer circumference thereof.
  • the small core sections 4, 5, 8, and 9 are also constructed out of a tapered strip. This tapered strip is widest at a point in between its ends and tapers towards its narrow ends.
  • the strip of material comprising each core section can be continuous or cut up into several segments to facilitate the assembly of each core Section.
  • FIG. 3 and 4 is shown another form of my invention.
  • This form of invention is identical to the rst embodiment in that large core sections 12 and 13 are looped through conventional winding cylinders 1, 2, and 3, and these large core sections abut each other at a leg thereof and lie in substantially the same plane.
  • a pair of small end core sections 10, 11 or 14, 15 abut each other and 'also the non-abutting legs of large core sections 12 and 13 by looping a pair of end core sections through each of the endmost cylinders 1 and 3.
  • Each pair of end core sections located at opposite ends of the core structure are disposed relative to each other at 'an angle, are positioned on opposite sides of the central vertical plane of large core sections 12, and 13, ⁇ and are spaced equidistantly from ⁇ said plane. Also, the apex of the angle formed by each pair of end core sections points towards the whole core structure.
  • the Figures 3 and 4 form of invention differs from the Figures 1 and 2 form of invention in that instead of using tapered core strip material several strips of uniform but different widths are used to construct each core section. Such a stepped form of core construction will not give as high a space factor as when tapered strip material is used. However, since it may be diflicult to accurately cut tapered strip material, a stepped core construction may present a manufacturing advantage.
  • a t'nree phase transformer core comprising two rela tively large substantially equal dirnensioned rectangularlike core sections, each of said core sections having two vertical legs and two horizontal yokes which define a window opening, said core sections being butted up against each other ⁇ along only one of the legs thereof and being disposed in substantially the same vertical plane, and two pairs of relatively small substantially equal dimensioned rectangular-like core sections, each of said small core sections having two vertical legs and two ⁇ horizontal yokes which deline a window opening, only one of the legs of each core section of one of said pairs being butted up against each other yand against one of the outer legs of said two large core sections, and only one of the legs of each core section of the other one of said pairs being butted up against each other and against the other one of the outer legs of said two large core sections, each of said pairs having their core sections disposed with respect to each other at an angle of substantially degrees and ysubstantially equidistantly along opposite sides of said plane, the apexe

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Or Transformers For Communication (AREA)
US336285A 1953-02-11 1953-02-11 Three-phase transformer core Expired - Lifetime US2761107A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US336285A US2761107A (en) 1953-02-11 1953-02-11 Three-phase transformer core
CH320517D CH320517A (de) 1953-02-11 1954-02-10 Dreiphasen-Transformator
DEG13720A DE1061891B (de) 1953-02-11 1954-02-10 Eisenkoerper fuer Dreiphasentransformatoren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US336285A US2761107A (en) 1953-02-11 1953-02-11 Three-phase transformer core

Publications (1)

Publication Number Publication Date
US2761107A true US2761107A (en) 1956-08-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US336285A Expired - Lifetime US2761107A (en) 1953-02-11 1953-02-11 Three-phase transformer core

Country Status (3)

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US (1) US2761107A (de)
CH (1) CH320517A (de)
DE (1) DE1061891B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991437A (en) * 1955-09-20 1961-07-04 Elin Ag Fur Elek Sche Ind Magnetic core
US4234862A (en) * 1977-07-22 1980-11-18 Alsthom-Unelec Robust polyphase transformer
US4588971A (en) * 1981-12-11 1986-05-13 Societe Nouvelle Transfix Electric transformer with annular coil forms

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1170531C2 (de) * 1961-01-04 1973-04-05 Siemens Ag Stromwandler in Kaskadenbauweise mit geteiltem Isolator und mehreren Kernen unterschiedlicher Genauigkeit
CA1211169A (fr) * 1984-04-03 1986-09-09 Nicolai Alexandrov Transformateur de distribution a circuit magnetique enroule

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1933140A (en) * 1929-01-29 1933-10-31 Kuhlman Electric Company Transformer and method of making same
US2199116A (en) * 1938-12-20 1940-04-30 Gen Electric Transformer coil winding device
US2483159A (en) * 1946-12-26 1949-09-27 Gen Electric Magnetic core
US2561250A (en) * 1949-09-23 1951-07-17 Gen Electric Magnetic core
US2595753A (en) * 1949-12-31 1952-05-06 Gen Electric Equalizer winding for five-legged three-phase cores

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1390050A (en) * 1921-09-06 Transformer
US1486109A (en) * 1922-04-05 1924-03-04 Walter M Scott Electric transformer
US2220733A (en) * 1938-01-25 1940-11-05 Gen Electric Transformer and method of making the same
US2318095A (en) * 1940-08-17 1943-05-04 Westinghouse Electric & Mfg Co Core structure
DE760153C (de) * 1940-12-21 1953-06-29 Aeg Mit der Eisenbahn verfahrbarer Grosstransformator
DE908639C (de) * 1941-12-21 1954-04-08 Aeg Transformator grosser Leistung und Spannung
US2401952A (en) * 1943-09-10 1946-06-11 Line Material Co Three-phase transformer
US2613430A (en) * 1946-04-26 1952-10-14 Mcgraw Electric Co Method of making transformer cores
US2458112A (en) * 1947-01-20 1949-01-04 Line Material Co Three-phase transformer construction

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1933140A (en) * 1929-01-29 1933-10-31 Kuhlman Electric Company Transformer and method of making same
US2199116A (en) * 1938-12-20 1940-04-30 Gen Electric Transformer coil winding device
US2483159A (en) * 1946-12-26 1949-09-27 Gen Electric Magnetic core
US2561250A (en) * 1949-09-23 1951-07-17 Gen Electric Magnetic core
US2595753A (en) * 1949-12-31 1952-05-06 Gen Electric Equalizer winding for five-legged three-phase cores

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2991437A (en) * 1955-09-20 1961-07-04 Elin Ag Fur Elek Sche Ind Magnetic core
US4234862A (en) * 1977-07-22 1980-11-18 Alsthom-Unelec Robust polyphase transformer
US4588971A (en) * 1981-12-11 1986-05-13 Societe Nouvelle Transfix Electric transformer with annular coil forms

Also Published As

Publication number Publication date
CH320517A (de) 1957-03-31
DE1061891B (de) 1959-07-23

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