US3810058A - Expandable coil bracing tubes for electrical inductive apparatus - Google Patents

Expandable coil bracing tubes for electrical inductive apparatus Download PDF

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Publication number
US3810058A
US3810058A US00345812A US34581273A US3810058A US 3810058 A US3810058 A US 3810058A US 00345812 A US00345812 A US 00345812A US 34581273 A US34581273 A US 34581273A US 3810058 A US3810058 A US 3810058A
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United States
Prior art keywords
magnetic core
expandable
metallic
winding support
support member
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
US00345812A
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English (en)
Inventor
D White
L Morris
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ABB Inc USA
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Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US00345812A priority Critical patent/US3810058A/en
Priority to CA194,828A priority patent/CA991284A/en
Priority to FR7410092A priority patent/FR2223802B1/fr
Priority to JP3406774A priority patent/JPS5311652B2/ja
Application granted granted Critical
Publication of US3810058A publication Critical patent/US3810058A/en
Assigned to ABB POWER T&D COMPANY, INC., A DE CORP. reassignment ABB POWER T&D COMPANY, INC., A DE CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION, A CORP. OF PA.
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
    • H01F27/28—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
    • 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
    • H01F27/303—Clamping coils, windings or parts thereof together
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
    • Y10T29/49078—Laminated

Definitions

  • the present method of fabricating electrical inductive apparatus of the type described herein utilizes wooden dowels or glass spacers disposed between the magnetic core and the winding support tube on which the windings of the electrical inductive apparatus are placed.
  • the purpose of the wooden dowels or the glass spacers is to prevent the collapse of the winding support tube against the magnetic core during a short circuit condition.
  • support of the windings is required.
  • the supports heretofore utilized have a-variety of disadvantages.
  • This invention utilizes a preshaped, hollow, expandable metal tube which can be easily placed into position between the magnetic core and a winding support tube of an electrical inductive apparatus, such as a transformer. After being placed in position between the winding support tube and the magnetic core, the metal tube is expanded by internal pressure until a tight fitting relationship between the magnetic core and the winding support tube is obtained.
  • the internal pressure used to expand the metal tube can be obtained by hydraulic pressure, or other suitable means.
  • the metal tubes are expandable, fewer stock sizes are necessary than were required in the prior art. Also, since the metal tubes are expandable, selection of the proper size tube is not as difficult as required by the present method. Since the tubes do not require a tight fit before expansion, the need to drive them into place, and thus possibly damage the magnetic core of the transformer, is also eliminated. In addition, because a tight fit is not required before expansion, the need for the worker to stand on the elevated platform while installing the metal tubes, as required when using the wooden dowels or glass spacers, is also eliminated.
  • the expandable metal tubes provide a more uniform fit over the entire axial length of the winding support tube, and there is less tendency for them to loosen as the final metal tubes are expnaded.
  • the metal tubes require no initial processing to prevent shrinkage as is now required with a wooden dowel.
  • Metal tubes are also more economical than the glass spacers now used in the art.
  • the metal tubes are rigid enough to maintain a tight fit or bracing system between the magnetic core and the winding support tube after they have been expanded.
  • the metal tubes after expansion, do not distort or become loose due to short circuiting of the winding.
  • An object of the invention is to provide a method of fabrication for an electrical inductive apparatus, such as a transformer, utilizing a preshaped, hollow, expandable metal tube, which, after expansion, provides a tight fitting relationship between the magnetic core and the winding support tube of the transformer. It is desirable, and, it is a further object of this invention, to provide an economical, efficient, and satisfactory arrangement for supporting the winding tube of a transformer.
  • FIG. 1 is a perspective view of a core-form transformer, with portions removed for clarity, constructed according to the teachings of this invention
  • FIG. 2 is a cross-sectional view of the magnetic core taken along section line II-II of FIG. 1;
  • FIG. 3 is a cross-sectional view of a preformed expandable metal tube used in the invention.
  • FIG. 4 is a block diagram illustrating the steps comprising the method of fabrication of a transformer embodying the invention.
  • FIG. 1 a perspective view of a power transformer 10 embodying the teachings of this invention is illustrated.
  • the drawing illustrates a three phase power transformer, it is to be understood that this invention can be utilized on any core-form type transformer.
  • the transformer 10 comprises a casing 12 having a magnetic core 14 disposed within the casing 12.
  • the magnetic core 14 has a yoke portion 16, a first leg 18, a second leg 20 and a third leg 21.
  • Each of the legs 18, 20 and 21 of the magnetic core 14 is fitted with a wind- 3 ing assembly comprising a primary winding 22 and a secondary winding 24.
  • the high voltage or primary winding structure 22 and the low voltage or secondary winding structure 24 are concentrically arranged so as to axially surround each of the legs 18, and 21 of the magnetic core 14.
  • the low voltage or secondary winding structure 24 is disposed so as to be the inner of the winding structures and lies closest to the legs 18, 20 and 21 of the magnetic core 14.
  • the high voltage or primary winding structure 22 is disposed so as to axially surround the low voltage or secondary winding structure 24.
  • the high voltage'or primary winding structure 22 comprises a plurality of radially disposed conductor turns which form an array of coil discsstacked in an axial direction.
  • the low voltage or secondary winding structure 24 comprises a plurality of layers of strap conductor.
  • a winding support member 26 axially surrounds the leg 20 of the magnetic core 14.
  • the winding support member 26 is concentrically disposed about the leg 20 of the magnetic core 14 and extends axially between the leg '20 and the low voltage or secondary winding structure 24.
  • the winding support member 26 is commonly a thin-walled, hollow, cylindrical tube fabricated from an insulating material, such as cardboard, and serves to support the low voltage or secondary winding structure 24 spaced slightly away from the leg 20 of the magnetic core 14.
  • An expandable metal tube 28 extends axially between the leg 20 of the magnetic core 14 and the winding support member 26.
  • the expandable metal tube 28 is a thin-walled, hollow, elongated tube fabricated of low carbon steel approximately 0.030 inch thick.
  • the expandable metal tube 28 is a peripherially closed member having an opening extending centrally and axially throughout its length.
  • the expandable metal tube 28 responds to an increase in pressure within it by expanding from a first preformed cross-section shape to an expanded second and different cross-section shape.
  • the expandable metal tube 28 When the expandable metal tube 28 has been expanded, in a manner to be described more fully herein, it simultaneously abuts, throughout its entire axial length, both the leg 20 of the magnetic core 14 and the inner surface of the winding support member 26.
  • the expandable metal tube 28 pro; vides a tight fitting relationship between the leg 20 of the magnetic core 14 and the winding support member 26.
  • the expandable metal tube 28 braces the winding support member 26 against the leg 20 of the magnetic core 14 and prevents the collapse of the winding support member 26 when the winding support member 26 experiences the high mechanical stresses which occur during a short circuit condition on the windings.
  • the expandable metal tube 28, when expanded to the second cross-section shape, will not collapse or change from this second cross-section shape under the high mechanical stresses which occur during a short circuit condition because the pressure exerted on the expandable metal tube 28 during the short circuit condition is less than the pressure required to expand the expandable metal tube 28 from the first preformed crosssection shape to the expanded second cross-section shape.
  • the magnetic core 14 is comprised of a plurality of metal laminations 30.
  • the laminations 30 are stacked so that the core leg 18, the core leg 20, and the core leg 21 have a generally cruciform cross-section shape.
  • the cruciform cross-section shape is obtained by stacking a predetermined number of individual laminations 30 in sections, the width of the laminations in each section decreasing as the outward distance from the center lamination section increases.
  • the cruciform crosssection shape of the core leg 20 is best illustrated in FIG. 2.
  • the individual meta] lamination 30 has a silicon coating which provides electrical insulation for the lamination. However, the laminations 30 have sheared edges which expose the steel which comprises the lamination.
  • An insulating member 32 is therefore required from end to end of each core leg in order to prevent direct contact between the exposed edges of the metal laminations 30 and each of the expandable metal tubes 28.
  • the insulating members32 prevent direct contact between the exposed edges of the metal laminations 30 and the expandable metal tubes 28 when the expandable metal tubes 28 are in the expanded cross-section shape.
  • the insulating members 32 prevent the expandable metal tubes 28 from short circuiting the laminations 30, and thereby prevents or reduces the flow of eddy currents in the laminations 30 and the expandable metal tubes 28.
  • the insulating members 32 may be sheets of nonconducting material, such as .cardboard, wrapped around the legs of the magnetic core 14 in such a manner so that the interior surface of the cardboard sheet substantially contacts the entire axial surface of the core leg 20, the cardboard sheet thereby following the contour of the cruciform cross-section of the core leg.
  • an alternative insulating coating of the silicone jelly or like material could be applied on the exposed edges of the metal laminations 30 to prevent direct contact between those edges and the. expandable metal tubes 28.
  • a dielectric fluid 34 preferably oil, is contained within the casing 12 and completely surrounds the magnetic core 14, the high voltage or primary winding structure 22, and the low voltage or secondary winding structure 24. Since the expandable metal tubes 28 are hollow, when they are in the expanded second crosssection shape, the oil dielectric 34 fills the hollow, expandable metal tubes 28 and assists the cooling of the transformer 10.
  • the casing 12 has disposed thereon high voltage bushings 36 which provide electrical insulation for the electrical leads to the high voltage or primary winding structure 22.
  • the casing 12 also has disposed thereon low voltage bushings 38 which provides electrical insulation for the electrical leads from the low voltage or secondary winding structure 24.
  • the metal laminations 30 which are stacked to form the magnetic core 14 are secured by a top end frame 40 and a bottom end frame 42.
  • the laminations 30 are further secured by a first locking plate 44, a second locking plate (not shown) and a bolt 46 which extends through the first locking plate 44, through the metal laminations 30, and through the second locking plate.
  • the high voltage or primary winding structure 22 is secured and compressed by a pressure block 48 and a pressure ring 50.
  • An insulating barrier 52 separates the leg 20 from each of the legs 18 and 21.
  • FIG. 2 a cross-section view of the leg 20 of the magnetic core 14 taken along section line II-II of FIG. 1 is illustrated.
  • the magnetic core 14 is comprised of a plural ity of metal laminations 30 which are disposed so as to provide the magnetic core 14 with a generally cruciform cross-section.
  • the core leg 20 of the magnetic core 14 has a plurality of discrete stepped gradations 54 extending about its perimeter.
  • Axially surrounding the core leg 20 of the magnetic core 14 is the winding support member 26.
  • the interior surface of the winding support member 26 comes in contact with the core leg 20 of the magnetic core 14 at a plurality of contact points illustrated by reference numeral 56.
  • the axial surfaces of the core leg 20 of the magnetic core 14 and the interior surface of the winding support member 26 define a plurality of void spaces 58 which extend axially between the core leg 20 of the magnetic core 14 and the winding support member 26.
  • the expandable metal tubes 28 are disposed so as to occupy each of the void spaces 58 which extend between the core leg 20 of the magnetic core 14 and the winding support member 26.
  • the expandable metal tubes 28 are inserted into the void spaces 58 that lie between the core leg 20 of the magnetic core 14 and the winding support member 26.
  • the expandable metal tubes 28 are stoppered at one end thereof and filled with a fluid medium in preparation for expansion.
  • the expandable metal tubes 28 are then expanded from a first predetermined cross-section shape to an expanded section cross-section shape by applying pressure to the fluid medium within the expandable metal tubes 28. After the expandable metal tubes 28 have been expanded, the stopper is removed and the fluid medium is withdrawn. While in the expanded second cross-section shape, the expandable metal tubes 28 simultaneously abut the interior surface of the winding support member 26 and the leg 20 of the magnetic core 14. Since the expandable metal tubes 28 are hollow, the fluid dielectric 34 disposed within the casing 12 is free to circulate through the hollow expandable metal tubes 28, thus aiding in cooling the transformer 10. An insulating member 32 is disposed between the leg 20 of the magnetic core 14 and each of the expandable metal tubes 28.
  • the purpose of the insulating member 32 is to prevent contact between the expandable metal tubes 28 and the exposed edges of the metal laminations 30 which comprise the leg 20 of the magnetic core 14 to prevent the expandable metal tubes 28 from short circuiting the metal laminations 30.
  • the expandable metal tubes 28 After the expandable metal tubes 28 have been expanded, they provide a tight fitting relationship between the leg 20 of the magnetic-core 14 and the winding support member 26.
  • the expandable metal tubes 28 are fabricated of a low carbon steel, approximately 0.030 inch thick. Once expanded, the expandable metal tubes 28 provide firm support for the winding support member 26 against the leg 20 of the magnetic core 14 throughout the axial length of the winding support member 26. By providing the tight fitting relationship, the expandable metal tubes 28 insure that the winding support member 26 will not shift.
  • the expandable metal tubes 28 will not collapse during the life of the transformer because the pressure required to expand the expandable metal tubes 28 to the second expanded cross-section shape is greater than any mechanical stress that may be impressed upon the expandable metal tubes 28 during a short
  • FIG. 3 a cross-sectional view of one shape of expandable metal tube 28 utilized in the invention is illustrated.
  • the expandable metal tube 28 is shown in its first normal cross-section shape.
  • the appropriately shaped expandable metal tube 28 is chosen for insertion into the particular void space 58.
  • the expandable metal tubes 28 are available in a variety of shapes; however, the expandable metal tube 28 while in the first cross-section shape is easily inserted into the appropriate void space 58 involved.
  • the workman simply chooses the appropriately shaped expandable metal tube 28 for insertion into the appropriate void space.
  • the expandable metal tube 28 need not be driven into place as was required in the prior art.
  • the appropriate expandable metal tube 28 is chosen and inserted into the selected void space, it is expanded from the first predetermined cross-section shape to the expanded second cross-section shape.
  • the expandable metal tube 28 When in the expanded second cross-section shape the expandable metal tube 28 provides a tight fitting relationship between the leg 20 of the magnetic core 14 and the winding support member 26.
  • FIG. 4 a block diagram describing the method of fabricating an electrical inductive apparatus, such as a transformer, embodying the teachings of this invention is illustrated.
  • the first step in fabricating the transformer 10 is stacking and securing the plurality of metal laminations 30 to form the magnetic core 14 having a cruciform cross-section.
  • the second step in the method of fabricating the transformer 10 is providing the insulating member 32 to insulate the exposed edges of the metal laminations 30 from direct contact with the expandable metal tubes 28.
  • the third step in the method of fabricating the transformer 10 is disposing the winding support member 26 so as to axially surround the leg 20 of the magnetic core 14.
  • the interior surface of the winding support member 26 contacts the leg 20 of the magnetic core 14 at the plurality of contact points 56 (FIG. 2) about the, interior surface of the winding support member 26.
  • the axial surfaces of the leg 20 of the magnetic core 14 and the interior surface of the winding support member 26 define the plurality of void spaces 58 which extend axially between the axial surfaces of the leg 20 of the magnetic core 14 and the winding support member 26.
  • the fourth step in the method of fabricating the transformer 10 is providing the low voltage or secondary winding structure 24 and the high voltage or primary winding structure 22 concentrically and axially around the winding support member 26. Since the expandable metal tubes 28 provides a tight fitting relationship between the leg of the magnetic core 14 and the winding support member 26, the winding support member 26 will support the winding structures 22 and 24 and prevent the collapse of the winding struc tures 22 and 24 during a short circuit condition.
  • the fifth step in the method of fabricating the transformer 10 is inserting the expandable metal tubes 28 into the void spaces 58 defined by the axial surfaces of the leg 20 of themagnetic core 14 and the winding support member 26.
  • the expandable metal tubes 28 extend axially between the leg 20 of the magnetic core 14 and the winding support member 26 for the entire length of the support member 26.
  • the sixth step in the method of fabricating the transformer 10 ' is expanding the expandable metal tubes 28 from the first preformed cross-section shape to the expanded second cross-section shape.
  • a fluid medium such as oil
  • the fluid medium is then subjected to a pressure and the expandable metal tubes 28 respond to the increased pressure therein by expanding from the first preformed cross-section shape to the expanded crosssection shape.
  • the expandable metal tubes 28 After the expandable metal tubes 28 has been expanded, they simultaneously abut the leg 20 of the magnetic core 14 and the interior surface of the winding support tube 26 which surrounds the leg 20 of the magnetic core 14.
  • the expandable metal tubes provide a tight fitting relationship between the leg 20 of the magnetic core 14 and the winding support member 26.
  • the expandable metal tubes 28 brace the winding support member 26'and prevent the winding support member 26 from collapsing due to the high mechanical stress imposed on the winding support member 26 during a short circuit condition.
  • the expandable metal tubes 28 will not collapse during a short circuit condition because the force exerted on the expandable metal tubes 28 during a short circuit condition does not exceed the force required to expand the expandable metal tubes 28 from the first preformed cross-section shape to the expanded cross-section shape.
  • the stopper is removed and the oil dielectric 34, which is disposed within the transformer casing 12, can circulate through the central opening of the expandable metal tubes 28 to assist in cooling the transformer 10.
  • the final step in the method of fabricating the transformer 10 is disposing the magnetic core 14 within the casing 12.
  • the magnetic core 14 has the legs 18, 20 and 21, each of the legs 18, 20 and 21 having thereon the primary winding structure 22 and the secondary winding structure 24.
  • the winding structures 22 and 24 are supported by the winding support member 26.
  • the winding support member 26 is supported against the legs of the magnetic core 14 by the expandable metal tube 28 in the expanded second cross-section shape.
  • the invention discloses an improved method of fabricating an electrical inductive apparatus, such as a transformer, which is cheaper, more economical, and easier to manufacture. Inserting an expandable metal tube between the magnetic core of the transformer and a winding support member, then expanding the expandable metal tube by. suitable means, provides a tight fitting relationship between the winding support member and the magnetic core which supports and braces the winding support member against the high mechanical stresses encountered during a short circuit condition, thereby providing a more reliable transformer.
  • An electric inductive apparatus comprising,
  • insulating means disposed between said axial surfaces of said magnetic core and said expandable, metallic, member, said insulating means preventing electrical contact between said magnetic core and said expandable, metallic, fluid-tight member.
  • said magnetic core has a thin, evenly applied coating of insulating material thereon, said coating of insulating material being disposed between said magnetic core and said expandable, metallic, member, said insulating coating preventing electrical contact be tween said magnetic core and said expandable, metallic, fluid-tight member;
  • said magnetic core comprises a plurality of metal laminations stacked so as to provide said magnetic core with a cruciform cross-section, said magnetic core thereby having a plurality of discrete, stepped graduations disposed about the perimeter of said cruciform cross-section, said magnetic core having a plurality of axial surfaces,
  • said winding support member comprising a cylindrical winding tube, said winding tube axially surrounding said magnetic core, said winding tube contacting said. magnetic core at a plurality of contact points along the interior surface of said winding tube, the interior surface of said winding tube and the axial surface of said magnetic core defining a plurality of void spaces which extend axially between the axial surfaces of said magnetic core and the interior surface of said winding tube, and
  • said expandable, metallic, member being disposed to occupy at least one of the plurality of void spaces which extend axially between the axial surfaces of said magnetic core and the interior surface of said winding support member, insulating means disposed adjacent the axial surface of said magnetic netic core.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
US00345812A 1973-03-28 1973-03-28 Expandable coil bracing tubes for electrical inductive apparatus Expired - Lifetime US3810058A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00345812A US3810058A (en) 1973-03-28 1973-03-28 Expandable coil bracing tubes for electrical inductive apparatus
CA194,828A CA991284A (en) 1973-03-28 1974-03-13 Expandable coil bracing tubes for electrical inductive apparatus
FR7410092A FR2223802B1 (enrdf_load_stackoverflow) 1973-03-28 1974-03-25
JP3406774A JPS5311652B2 (enrdf_load_stackoverflow) 1973-03-28 1974-03-28

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US00345812A US3810058A (en) 1973-03-28 1973-03-28 Expandable coil bracing tubes for electrical inductive apparatus

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US3810058A true US3810058A (en) 1974-05-07

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US (1) US3810058A (enrdf_load_stackoverflow)
JP (1) JPS5311652B2 (enrdf_load_stackoverflow)
CA (1) CA991284A (enrdf_load_stackoverflow)
FR (1) FR2223802B1 (enrdf_load_stackoverflow)

Cited By (10)

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US4180717A (en) * 1976-10-21 1979-12-25 Barmag Barmer Maschinenfabrik Ag Inductively heatable godet with insulating means
US5604971A (en) * 1993-09-30 1997-02-25 Steiner; Robert E. manufacturing method for variable laminations used in electro-magnetic induction devices
US5640752A (en) * 1993-09-30 1997-06-24 Steiner; Robert E. Controlled adjustable manufacturing method for variable laminations used in electro-magnetic induction devices
US6427314B1 (en) * 1993-10-06 2002-08-06 Biosense, Inc. Magnetic determination of position and orientation
WO2004086428A1 (en) * 2003-03-26 2004-10-07 Kompozitor Muanyagipari Fejleszto Kft. Procedure for the preparation of the supporting structure between the iron core and the core tube of transformers
US20080068121A1 (en) * 2006-09-15 2008-03-20 Kazuyuki Fukui Transformer
US20130106547A1 (en) * 2011-11-01 2013-05-02 Hitachi Industrial Equipment Systems Co., Ltd. Amorphous Core Transformer
US20130300526A1 (en) * 2011-02-16 2013-11-14 Abb Technology Ag Cooling system for dry transformers
US10262785B2 (en) * 2017-08-24 2019-04-16 Prolec-Ge Internacional, S. De R. L. De C. V. Press-clamp with clamping force sensor for electric transformer winding
US11062835B2 (en) * 2014-10-07 2021-07-13 Abb Power Grids Switzerland Ag Vehicle transformer

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GB2212670A (en) * 1987-11-24 1989-07-26 Vni Pk I Teknologichesky I Tra Bar for induction devices

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US2527236A (en) * 1949-03-29 1950-10-24 Gen Electric Combined coil spacer and terminal board for dry type transformers
US3077031A (en) * 1960-05-10 1963-02-12 Howard A Fromson Method of forming sheet metal panels
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US3306370A (en) * 1964-05-27 1967-02-28 Jacobsen Mfg Co Turf groomer with adjustable turf-engaging implements
GB1094442A (en) * 1964-03-02 1967-12-13 English Electric Co Ltd Laminated magnetic cores for inductive apparatus
US3447112A (en) * 1967-11-16 1969-05-27 Westinghouse Electric Corp Air cooled transformer
US3496506A (en) * 1968-02-28 1970-02-17 Westinghouse Electric Corp Magnetic core structure
US3564472A (en) * 1967-08-14 1971-02-16 Smit Nijmegen Electrotec Windings for transformers or choke coils
US3568118A (en) * 1968-02-16 1971-03-02 Hitachi Ltd Transformer
US3663850A (en) * 1970-08-03 1972-05-16 Phelon Co Inc Field means for a dynamoelectric machine, magnet preassembly for use therein
US3720897A (en) * 1971-08-09 1973-03-13 Westinghouse Electric Corp Electrical inductive apparatus

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Publication number Priority date Publication date Assignee Title
DE25502C (de) * C. E. STEYER in Neu-Schleufsig, Sachsen Heiz- und Kochofen
US2527236A (en) * 1949-03-29 1950-10-24 Gen Electric Combined coil spacer and terminal board for dry type transformers
US3077031A (en) * 1960-05-10 1963-02-12 Howard A Fromson Method of forming sheet metal panels
GB990520A (en) * 1960-11-29 1965-04-28 Licentia Gmbh Improvements in or relating to laminated magnetic cores
GB1094442A (en) * 1964-03-02 1967-12-13 English Electric Co Ltd Laminated magnetic cores for inductive apparatus
US3306370A (en) * 1964-05-27 1967-02-28 Jacobsen Mfg Co Turf groomer with adjustable turf-engaging implements
US3564472A (en) * 1967-08-14 1971-02-16 Smit Nijmegen Electrotec Windings for transformers or choke coils
US3447112A (en) * 1967-11-16 1969-05-27 Westinghouse Electric Corp Air cooled transformer
US3568118A (en) * 1968-02-16 1971-03-02 Hitachi Ltd Transformer
US3496506A (en) * 1968-02-28 1970-02-17 Westinghouse Electric Corp Magnetic core structure
US3663850A (en) * 1970-08-03 1972-05-16 Phelon Co Inc Field means for a dynamoelectric machine, magnet preassembly for use therein
US3720897A (en) * 1971-08-09 1973-03-13 Westinghouse Electric Corp Electrical inductive apparatus

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180717A (en) * 1976-10-21 1979-12-25 Barmag Barmer Maschinenfabrik Ag Inductively heatable godet with insulating means
US4304975A (en) * 1976-10-21 1981-12-08 Barmag Barmer Machinenfabrik Ag Inductively heatable godet
US5604971A (en) * 1993-09-30 1997-02-25 Steiner; Robert E. manufacturing method for variable laminations used in electro-magnetic induction devices
US5640752A (en) * 1993-09-30 1997-06-24 Steiner; Robert E. Controlled adjustable manufacturing method for variable laminations used in electro-magnetic induction devices
US6427314B1 (en) * 1993-10-06 2002-08-06 Biosense, Inc. Magnetic determination of position and orientation
WO2004086428A1 (en) * 2003-03-26 2004-10-07 Kompozitor Muanyagipari Fejleszto Kft. Procedure for the preparation of the supporting structure between the iron core and the core tube of transformers
US20080068121A1 (en) * 2006-09-15 2008-03-20 Kazuyuki Fukui Transformer
US8198973B2 (en) * 2006-09-15 2012-06-12 Hitachi Industrial Equipment Systems Co., Ltd. Transformer
US20130300526A1 (en) * 2011-02-16 2013-11-14 Abb Technology Ag Cooling system for dry transformers
US9105389B2 (en) * 2011-02-16 2015-08-11 Abb Technology Ag Cooling system for dry transformers
US20130106547A1 (en) * 2011-11-01 2013-05-02 Hitachi Industrial Equipment Systems Co., Ltd. Amorphous Core Transformer
US9105393B2 (en) * 2011-11-01 2015-08-11 Hitachi Industrial Equipment Systems Co., Ltd. Amorphous core transformer
US11062835B2 (en) * 2014-10-07 2021-07-13 Abb Power Grids Switzerland Ag Vehicle transformer
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Also Published As

Publication number Publication date
FR2223802A1 (enrdf_load_stackoverflow) 1974-10-25
JPS49129127A (enrdf_load_stackoverflow) 1974-12-11
CA991284A (en) 1976-06-15
JPS5311652B2 (enrdf_load_stackoverflow) 1978-04-24
FR2223802B1 (enrdf_load_stackoverflow) 1980-08-01

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