US3564472A - Windings for transformers or choke coils - Google Patents

Windings for transformers or choke coils Download PDF

Info

Publication number
US3564472A
US3564472A US749870A US3564472DA US3564472A US 3564472 A US3564472 A US 3564472A US 749870 A US749870 A US 749870A US 3564472D A US3564472D A US 3564472DA US 3564472 A US3564472 A US 3564472A
Authority
US
United States
Prior art keywords
winding
envelope
bag
pressure
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
US749870A
Other languages
English (en)
Inventor
Egbertus Adrianus Frowein
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.)
Smit Nijmegen Electrotechnische Fabrieken NV
Original Assignee
Smit Nijmegen Electrotechnische Fabrieken NV
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
Priority claimed from NL6711138A external-priority patent/NL6711138A/xx
Priority claimed from NL6801940A external-priority patent/NL6801940A/xx
Application filed by Smit Nijmegen Electrotechnische Fabrieken NV filed Critical Smit Nijmegen Electrotechnische Fabrieken NV
Application granted granted Critical
Publication of US3564472A publication Critical patent/US3564472A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01F27/02—Casings
    • 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
    • H01F27/002—Arrangements provided on the transformer facilitating its transport
    • 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
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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
    • H01F41/04—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 for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2217/00—Coatings on glass
    • C03C2217/20—Materials for coating a single layer on glass
    • C03C2217/21—Oxides
    • C03C2217/229—Non-specific enumeration
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C2218/00—Methods for coating glass
    • C03C2218/10—Deposition methods
    • C03C2218/11—Deposition methods from solutions or suspensions
    • C03C2218/112—Deposition methods from solutions or suspensions by spraying
    • 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
    • Y10T29/49071—Electromagnet, transformer or inductor by winding or coiling

Definitions

  • the invention relates to a winding for a leg portion of the magnetic core of a transformer or a choke coil, said winding being wrapped in a torus-shaped envelope. It has the object to provide a winding which can be easily mounted and easily put under axial pressure to take up the forces occurring at a short-circuit and which is adapted to be separately transported and mounted on a leg portion of the magnetic core of a transformer or a choke coil on the spot of assembly thereof. This makes it possible to transport transformers and choke coils in parts, so that the design has to make less allowance for the railwayprofile and transformers and choke coils of very much larger power and for higher voltages can be manufactured more easily.
  • the object aimed at is obtained in that the said envelope consists of or contains material, which is adapted to be subjected to a tensile load at least in planes containing the axis of the winding, and at least one pneumatically or hydraulically expandable bag to exert axial pressure on the winding is provided between at least one end face of the winding and the corresponding end face of the envelope.
  • the envelope may consist of parallel wires, e.g. glass fibre wires, which are mostly used in bundles (rovings).
  • Such an envelope can take up great tensile stresses, so that, when the bag is pneumatically or hydraulically put under pressure, the axial pressure required to keep, under all circumstances, the turns of the winding pressed against each other can be exerted on the winding. If moreover, the envelope is made impenetrable for moisture, for instance by means of synthetic material, the winding can be transported separately, that means without being mounted in the trans former tank.
  • the envelope may be formed as a torusshaped body constituted by parallel glass fibre wires wound around the winding and pre-stressed by said bag and a coating of synthetic material provided on the outer surface of said body.
  • the torus-shaped body of glass fibre wires itself hardly contains synthetic material. It is avoided thereby that synthetic material is subjected to compressive stress between the stretched wires which would result in the occurrence of creeping phenomena in the synthetic material.
  • a construction may be used, in which the wall of the bag is locally formed as a curling diaphragm and the bag embraces said pressure ring with Patented Feb. 16, 1971 its wall part formed as a curling diaphragm.
  • This construction has the advantage that in order to exert the required pressure on the winding, said pressure depending on the elongation of the envelope, the relevant end face of the envelope can be moved over a relatively great distance, so that a great elongation of the envelope can be taken up.
  • Another advantage is, that the material of the bag need not be stretched at the enlargement of the volume thereof, so that it is less subjected to overload. Consequently, the bag need not be made from highly resilient material, which means that in the wall thereof a reinforcement of fibre material increasing the strength of the bag considerably can be used.
  • At least one pneumatically or hydraulically expandable bag is placed against one of the pressure rings covering the .end faces of the winding.
  • bundles of parallel glass fibre wires are wound around said winding,-the pressure rings and said bag.
  • the bag is pneumatically or hydraulically expanded and put under such a pressure as to subject the glass fibre wires to the desired tensile stress and the winding to the required axial compressive stress.
  • the pre-stressed torusshaped body of glass fibre wires is coated with a gasand liquidtight layer of synthetic material. This coating of synthetic material hardly penetrates into the voids between the glass fibre wires, since the latter are firmly forced against each other by the pre-tensioning thereof. The coating of synthetic material itself is not stressed, so that therein creeping phenomena are entirely avoided.
  • the envelope constructed in accordance with the invention is relatively very light, which facilitates the transport of the winding. Moreover, it has the advantage that it is adapted to keep the winding under axial compression during the transport from the factory to the spot where the transformer or the choke coil is to be assembled, without the necessity to use a heavy frame with rods adapted to be subjected to tensile stress.
  • the invention also relates to a transformer or a choke coil provided with one or more windings which are enveloped in the described manner.
  • FIG. 3 an axial cross sectional view of a portion of two concentrical transformer windings which are enclosed by a common envelope
  • FIGS. 1 and 2 one of the windings of a transformer is designated by 1.
  • a pressure ring 2 having a half-round cross sectional area is positioned against the lower end face of said winding and a fiat pressure ring 3 is placed against the upper end face thereof.
  • Mounted on the pressure ring 3 is a hydraulically expandable annular bag 4.
  • a cap 5 made of paper layers embraces the bag 4 and the pressure ring 3 and the assembly consisting of the winding 1, the pressure rings 2, 3, the bag 4 and the top 5 is wrapped in a torus-shaped envelope of parallel glass fibre wires 6 and a coating 7 of synthetic material.
  • the bag 4 is connected through a conduit Sprovided with a manometer 9 to a liquid supply conduit 10 provided with a check valve 11.and an expansion chamber 12, a wall of the latter being formed by a curling diaphragm 13 loaded by a spring 14.
  • the envelope of glass fibre wires After the envelope of glass fibre wires has been subjected to tension in the described manner, it is covered by a coating of hardening synthetic material 7 which seals the envelope liquid-tight. In that case the glass fibre wires 6 are pre-stressed but the coating of synthetic material 7 is not stressed. Furthermore there is no synthetic material between said wires. Owing thereto it is avoided that the glass fibre wires exert pressure on the synthetic material and creeping phenomena occurring in the synthetic material.
  • the space 15 inside the envelope 6, 7 is filled with transformer oil which is free of air and moisture.
  • the thus enveloped winding can be transported as such and positioned on a leg portion of the magnetic circuit of a transformer or a choke coil on the spot where said transformer or choke coil has to be assembled and used.
  • the winding is protected, during the transport, against air and moisture.
  • This makes it easily possible to transport transformers and choke coils, of which the dimensions are greater than those of transportable transformers and choke coils, in parts to the spot of assembly.
  • An other advantage is that the winding is held under the required tensile stress during its transport without the necessity to use the usual heavy frame and tension rods.
  • the winding is kept under pressure in the described manner without any frame, which means a great simplification of the transformer construction and creates the possibility to use a less capacious tank.
  • a pressure ring 25 is mounted on the upper end of the'winding 24.
  • the lower part 25a of said pressure ring 25 has a radial dimensions equal to those of the winding and the upper part 25b thereof has an outer diameter which is smaller and an inner diameter which is greater than that of the winding.
  • An indented annular bag 26 embraces the upper part 251) of the pressure ring and is connected by a conduit 27 to a gasor liquid-supply device (not shown).
  • the portion 26a of the wall of the bag 26 which embraces the part 25b of the pressure ring operates as a curling diaphragm.
  • the bag 26 and the cap 28 have been brought into place and the assembly has been wrapped in bundles or bands of parallel glass fibre wires 29, gas of liquid under pressure is fed into the bag 26 through the conduit 27. Due thereto the bag expands and the glass fibre wires are subjected to tensile stress. During the expansion of the bag 26 the Wall portion 26a thereof curls along the outer periphery and the inner periphery of the part 25b of the pressure ring. As the change of volume of the bag 26 only effects the curling of the Wall part 26a thereof, the material of the wall of the bag will not be stretched. This means that the wall of the bag can be made of flexible material adapted to be subjected to tensile stress, e.g. of rubber or synthetic material which is reinforced by fibrous substances. After the tensioning of the glass fiber wires 29 the gasand liquid-tight coating of synthetic material 30 is applied.
  • This embodiment has the advantage that the electrical connections of the winding can be led to the outside through the end faces of the enveloped winding in places between two bags. Due to the fact that the bags 31 embrace the parts 34b of the pressure ring 34 they are kept in place.
  • the envelope of the winding adapted to be subjected to tensile stress need not be liquid-tight.
  • a winding for a leg portion of the magnetic core of a transformer or a choke coil an envelope enclosing said winding, said envelope consisting of or containing material which is adapted to be subjected to a tensile load at least in planes containing the axis of said winding, at least one pneumatically or hydraulically expandable bag provided between at least one end face of the winding and the corresponding end face of the envelope, said envelope comprising a torus-shaped body constituted by parallel glass fibre wires wound around said winding and prestressed by said bag, and a coating of synthetic material provided on the other surface of said body.
  • a separately transportable winding-assembly adapted to be mounted as a unit on a leg portion of the magnetic core of a transformer or a Choke coil, said winding-assembly comprising at least one axially compressed winding, a torus-shaped moisture impermeble envelope completely surrounding said winding to isolate it from ambient atmosphere and leaving the central hole thereof sufficiently free for the insertion of said leg portion, at least one inflatable bag of pliant impermeable material which is provided within said envelope axially beyond one end face of said winding, and means for supplying and maintaining fluid under pressure in said bag, said envelope constituting the sole reaction member between said winding and said bag whereby axially to compress said Winding due to fluid pressure within said bag.
  • a self-contained winding assembly comprising: a
  • said envelope means includes tension-resistant filaments extending in planes containing the axis of said winding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)
US749870A 1967-08-14 1968-08-02 Windings for transformers or choke coils Expired - Lifetime US3564472A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL6711138A NL6711138A (de) 1967-08-14 1967-08-14
NL6801940A NL6801940A (de) 1968-02-12 1968-02-12

Publications (1)

Publication Number Publication Date
US3564472A true US3564472A (en) 1971-02-16

Family

ID=26644228

Family Applications (1)

Application Number Title Priority Date Filing Date
US749870A Expired - Lifetime US3564472A (en) 1967-08-14 1968-08-02 Windings for transformers or choke coils

Country Status (9)

Country Link
US (1) US3564472A (de)
AT (1) AT285726B (de)
BE (1) BE719116A (de)
CH (1) CH470738A (de)
DE (1) DE1763783B1 (de)
FR (1) FR1578610A (de)
GB (1) GB1237410A (de)
NO (1) NO119953B (de)
SE (1) SE339960B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810058A (en) * 1973-03-28 1974-05-07 Westinghouse Electric Corp Expandable coil bracing tubes for electrical inductive apparatus
US3978442A (en) * 1974-11-08 1976-08-31 Allmanna Svenska Elektriska Aktiebolaget Clamping of transformer windings by means of hydraulic power amplifiers
US4055826A (en) * 1976-04-29 1977-10-25 General Electric Company Resiliently supported windings in an electrical reactor
WO2010025916A1 (de) * 2008-09-05 2010-03-11 B2 Electronic Gmbh Hochspannungstransformator
CN113223829A (zh) * 2021-04-23 2021-08-06 东莞市拥城电子有限公司 变压器及其加工工艺

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3205525A1 (de) * 1982-02-12 1983-08-25 Siemens AG, 1000 Berlin und 8000 München Verfahren zur wartung, montage oder reparatur einer ein- oder mehrpoligen gekapselten, druckgasisolierten hochspannungsleitung oder hochspannungsschaltanlage

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE714480C (de) * 1930-04-07 1941-11-29 Siemens Ag Leistungstransformator
DE700635C (de) * 1933-01-14 1940-12-24 Siemens Schuckertwerke Akt Ges Transformator fuer grosse Leistung
CH417760A (de) * 1964-12-10 1966-07-31 Oerlikon Maschf Wicklung, insbesondere für Grosstransformatoren
FR1437071A (fr) * 1965-06-10 1966-04-29 Inst Dispositif de gainage pour des appareils électriques, en particulier des transformateurs du type à faible isolement et à peu de fluide de refroidissement
FR1468865A (fr) * 1965-10-22 1967-02-10 Westinghouse Electric Corp Appareil électrique d'induction

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810058A (en) * 1973-03-28 1974-05-07 Westinghouse Electric Corp Expandable coil bracing tubes for electrical inductive apparatus
US3978442A (en) * 1974-11-08 1976-08-31 Allmanna Svenska Elektriska Aktiebolaget Clamping of transformer windings by means of hydraulic power amplifiers
US4055826A (en) * 1976-04-29 1977-10-25 General Electric Company Resiliently supported windings in an electrical reactor
WO2010025916A1 (de) * 2008-09-05 2010-03-11 B2 Electronic Gmbh Hochspannungstransformator
US20110148433A1 (en) * 2008-09-05 2011-06-23 B2 Electronic Gmbh High-voltage transformer
CN102144269B (zh) * 2008-09-05 2012-09-19 B2电子有限公司 高压变压器
US8552737B2 (en) 2008-09-05 2013-10-08 B2 Electronic Gmbh High-voltage transformer
CN113223829A (zh) * 2021-04-23 2021-08-06 东莞市拥城电子有限公司 变压器及其加工工艺

Also Published As

Publication number Publication date
FR1578610A (de) 1969-08-14
CH470738A (de) 1969-03-31
BE719116A (de) 1969-01-16
SE339960B (de) 1971-11-01
DE1763783B1 (de) 1972-01-20
NO119953B (de) 1970-08-03
GB1237410A (en) 1971-06-30
AT285726B (de) 1970-11-10

Similar Documents

Publication Publication Date Title
US3564472A (en) Windings for transformers or choke coils
US2913011A (en) Flexible conduit
US3282757A (en) Method of making a filament reinforced pressure vessel
US5579609A (en) Rigidizable inflatable structure
US4694622A (en) Concrete structural elements, process and device for manufacturing these elements
US6221297B1 (en) Method of manufacturing a transformer coil with a disposable wrap and band mold and integrated winding mandrel
US3353817A (en) Elastic extension device
US2917568A (en) Oxygen delivery tube
US7943853B2 (en) Method for manufacturing a post insulator and a post insulator
GB933172A (en) Improvements in or relating to flexible tubing
US2328033A (en) Prestressing reinforcing device for concrete
US3350030A (en) Fiberglass reinforced textile bobbin
US3060640A (en) Cables for prestressing concrete
US3970144A (en) Subsurface shutoff valve and control means
JPH09190725A (ja) 光ファイバ複合架空地線の構造及び製造方法
JPH10333001A (ja) 光ファイバケーブル
JPS59103548A (ja) 超電導線輪
WO2004114332A3 (en) Low voltage composite mold
US2945912A (en) High voltage insulator
US4282504A (en) Fault limiter having a one-piece enclosure of glass-reinforced resin
GB1476491A (en) Screen for core legs of transformers reactors and the like
US3320567A (en) Pre-stressed winding assembly for transformers and inductance coils
US3327267A (en) Potential transformer
US2577427A (en) Insulating covering
GB953575A (en) Supporting column for electrical equipment