WO1998034250A1 - A winding in an electric machine with stationary parts - Google Patents

A winding in an electric machine with stationary parts Download PDF

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Publication number
WO1998034250A1
WO1998034250A1 PCT/SE1998/000157 SE9800157W WO9834250A1 WO 1998034250 A1 WO1998034250 A1 WO 1998034250A1 SE 9800157 W SE9800157 W SE 9800157W WO 9834250 A1 WO9834250 A1 WO 9834250A1
Authority
WO
WIPO (PCT)
Prior art keywords
winding
drums
cable
transformer
core
Prior art date
Application number
PCT/SE1998/000157
Other languages
French (fr)
Inventor
Li Ming
Peter Carstensen
Mats Leijon
Udo Fromm
Rongsheng Liu
Christian Sasse
Original Assignee
Asea Brown Boveri Ab
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 SE9700342A external-priority patent/SE511161C2/en
Application filed by Asea Brown Boveri Ab filed Critical Asea Brown Boveri Ab
Priority to EP98902354A priority Critical patent/EP0954871A1/en
Priority to BR9807136-0A priority patent/BR9807136A/en
Priority to AU58908/98A priority patent/AU5890898A/en
Priority to CA002276352A priority patent/CA2276352A1/en
Priority to JP53279998A priority patent/JP2001509961A/en
Priority to EA199900704A priority patent/EA002171B1/en
Publication of WO1998034250A1 publication Critical patent/WO1998034250A1/en

Links

Classifications

    • 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
    • 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
    • H01F27/2823—Wires
    • 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
    • H01F41/06—Coil winding
    • H01F41/064—Winding non-flat conductive wires, e.g. rods, cables or cords
    • 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
    • H01F41/06—Coil winding
    • H01F41/082—Devices for guiding or positioning the winding material on the former
    • H01F41/086—Devices for guiding or positioning the winding material on the former in a special configuration on the former, e.g. orthocyclic coils or open mesh coils

Definitions

  • the present invention relates to a winding as stated in the preamble of claim 1 in an electric machine with stationary parts, e.g. a power transformer, intended for use at high voltages, by which is meant primarily electric voltages exceeding 10 kV.
  • a typical working range for a transformer according to the invention may be 36-800 kV.
  • the insulating material must also be extremely pure and freely from conducting particles.
  • the moisture content in both the oil and other insulating material must also be far below that of the atmosphere. In normal production the moisture content in separate processes is reduced to values below 1 % for paper and other cellulose materials and a few micro- parts in the oil.
  • the whole insulation system must be carefully dried at the end of the manufacturing pro- cess. This high degree of purity and low moisture content must be maintained during transport and operation of the transformer.
  • a conductor is known through US 5,036,165, in which the insulation is provided with an inner and an outer layer of semiconducting pyrolized glassfiber. It is also known to provide conductors in a dynamo-electric machine with such an insulation, as described in US 5,066,881 for instance, where a semiconducting pyrolized glassfiber layer is in contact with the two paral- lei rods forming the conductor, and the insulation in the stator slots is surrounded by an outer layer of semiconducting pyrolized glassfiber.
  • the pyrolized glassfiber material is described as suitable since it retains its resistivity even after the impregnation treatment.
  • the object of the present invention is to solve the above problems and further improve such machines by simplifying manufacture, facilitating transport and reducing manufacturing and assembly costs. This object is achieved in that the machine according to the invention is given the features defined in the characterizing portion of claim 1.
  • the invention is primarily intended for use, and its advantages are particularly apparent, with a high- voltage cable of the type built up of a core having a plurality of strands, an inner semi-conducting layer surrounding the core, an insulating layer surrounding the inner semi-conducting layer and an outer semiconducting layer surrounding the insulating layer.
  • Mo- re particularly it relates to such a cable with a diameter in the range of 20-200 mm and a conducting area in the range of 80-3000 mm 2 .
  • Such applications of the invention thus constitute preferred embodiments.
  • the win- dings are preferably of a type corresponding to cables with solid, extruded insulation, such as those used nowadays for power distribution, e.g. XLPE-cables or cables with EPR-insulation .
  • a cable comprises an inner conductor composed of one or more strand parts, an inner semiconducting layer surrounding the conductor, a solid insulating layer surrounding this and an outer semiconducting layer surrounding the insulating layer.
  • Such cables are flexible, which is an important property in this context since the technology for the device according to the invention is based primarily on winding systems in which the winding is formed from cable which is bent during assembly.
  • the flexibility of a XLPE-cable normally corresponds to a radius of curvature of approximately 20 cm for a cable 30 mm in diameter, and a radius of curvature of approximately 65 cm for a cable 80 mm in diameter.
  • the term "flexible" is used to indicate that the winding is flexible down to a radius of curvature in the order of four times the cable diameter, preferably eight to twelve times the cable diameter.
  • the winding should be constructed to retain its properties even when it is bent and when it is subjected to layers retain their adhesion to each other in this context.
  • the material properties of the layers are decisive here, particularly their elasticity and relative coefficients of thermal expansion.
  • the insulating layer consists of cross- linked, low-density polyethylene
  • the semiconducting layers consist of polyethylene with soot and metal particles mixed in. Changes in volume as a result of temperature fluctuations are completely absorbed as changes in radius in the cable and, thanks to the comparatively slight difference between the coefficients of thermal expansion in the layers in relation to the elasticity of these materials, radial expansion can take place without the adhesion between the layers being lost.
  • the insulating layer may consist, for example, of a solid thermoplastic material such as low-density polyet- hylene (LDPE) , high-density polyethylene (HDPE) , polypropylene (PP) , polybutylene (PB), polymethyl pentene (PMP) , cross-linked materials such as cross-linked polyethylene (XLPE) , or rubber such as ethylene propylene rubber (EPR) or silicon rubber.
  • LDPE low-density polyet- hylene
  • HDPE high-density polyethylene
  • PP polypropylene
  • PB polybutylene
  • PMP polymethyl pentene
  • cross-linked materials such as cross-linked polyethylene (XLPE)
  • EPR ethylene propylene rubber
  • the inner and outer semiconducting layers may be of the same basic material but with particles of conducting material such as soot or metal powder mixed in.
  • the mechanical properties of these materials are affected relatively little by whether soot or metal powder is mixed in or not - at least in the proportions required to achieve the conductivity necessary according to the invention.
  • the insulating layer and the semiconducting layers thus have substantially the same coefficients of thermal expansion.
  • Ethylene-vinyl-acetate copolymers/nitrile rubber, butyl graft polyethylene, ethylene-butyl-acrylate-copolymers and ethylene-ethyl-acrylate copolymers may also consti- tute suitable polymers for the semiconducting layers.
  • the materials listed above have relatively good elasticity, with an E-modulus of E 500 MPa, preferably ⁇ 200 MPa.
  • the elasticity is sufficient for any minor differences between the coefficients of thermal expansion for the materials in the layers to be absorbed in the radial direction of the elasticity so that no cracks appear, or any other damage, and so that the layers are not released from each other.
  • the material in the layers is elastic, and the adhesion between the layers is at le- ast of the same magnitude as the weakest of the materials .
  • the conductivity of the two semiconducting layers is sufficient to substantially equalize the potential along each layer.
  • the conductivity of the outer semiconducting layer is sufficiently great to enclose the electrical field in the cable, but sufficiently small not to give rise to significant losses due to currents induced in the longitudinal direction of the layer.
  • each of the two semiconducting layers essentially constitutes one equipotential surface and the winding, with these layers, will substantially enclose the electrical field within it.
  • Figure 1 shows a schematic section through one phase of a power transformer according to the invention
  • Figure 2 shows a cross section through a winding cable used in the transformer according to the invention.
  • Figure 1 shows a part of a power transformer in section, having a transformer core 11, a low-voltage winding 12 and a high-voltage winding 13.
  • the windings are wound onto prefabricated drums 14 and 15. These drums are completely wound at the factory and then transported to the site where the transformer is to be used, where they are a mounted on respective phases of the core (only one phase of the transformer is shown in Figure 1) .
  • the high-voltage winding 13 is divided into two drums 15 for manufacturing and transport reasons.
  • the cables in the individual windings are connected by a cable joint 16 on site.
  • FIG. 2 shows a section through a power cable 1 for use in a dry power transformer according to the present invention.
  • the cable 1 comprises a number of strands 2 consisting of a conductor made of copper, for instance, having circular cross section. This conductor is ar- ranged in the middle of the cable 1.
  • Around the cable is a first semi-conducting layer 3.
  • Around the first semi-conducting layer 3 is an insulating layer 4, e.g. XLPE insulation.
  • insulating layer 4 Around the insulating layer 4 is a second semi-conducting layer 5.
  • the cable does not include the outer sheath that normally surrounds such cables for power distribution.
  • the cable may be of the size stated in the introduction.
  • Tubes or ducts for cooling air are arranged between the winding cables to cool the winding in the transformer according to the present invention. These tubes or ducts are suitably arranged in the drums 14 and 15 at manufacture before the transformer is transported to where it is to be used. Thanks to the invention a dry power transformer is achieved which is simpler to manufacture than conventional transformers. The transformer need not be transported as a unit from factory to site, and both transport and assembly become less expensive.
  • the invention is of course not limited to a power transformer but is also applicable to other electrical machines with stationary parts, such as inductive reactors .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Windings For Motors And Generators (AREA)

Abstract

A winding (13) in an electric machine with stationary parts consists of high-voltage cable (1) and is in the form of prefabricated drums (15) onto which the cable (1) forming the winding is wound. The drums (15) are mounted in the machine on site.

Description

A WINDING IN AN ELECTRIC MACHINE WITH STATIONARY PARTS
The present invention relates to a winding as stated in the preamble of claim 1 in an electric machine with stationary parts, e.g. a power transformer, intended for use at high voltages, by which is meant primarily electric voltages exceeding 10 kV. A typical working range for a transformer according to the invention may be 36-800 kV.
Conventional power transformers have, as disclosed e.g. in the book "Elektriska Maskiner" by Fredrik Gustavson, Page 3.6 - 3.12, Kungliga Tekniska Hogskolan, 1996, usually been cooled and insulated by oil. However, a number of problems are inherent in such oil-filled power transformers. An outer housing is required for the transformer with a transformer core with windings, oil for insulation and cooling, and mechanical bracing means of various types. The mechanical demands placed on this housing are considerable and the manufacturing and assembly processes are extremely time-consuming. Finally, the external dimensions of the housing are large, thus entailing transport problems. Oil-cooling, particularly pressurized oil-cooling, also requires access to oil pumps, external cooling elements and expansion vessels, etc. The insulating material must also be extremely pure and freely from conducting particles. The moisture content in both the oil and other insulating material must also be far below that of the atmosphere. In normal production the moisture content in separate processes is reduced to values below 1 % for paper and other cellulose materials and a few micro- parts in the oil. The whole insulation system must be carefully dried at the end of the manufacturing pro- cess. This high degree of purity and low moisture content must be maintained during transport and operation of the transformer.
Through e.g. JP 4 179 107, JP 6 196 343, and JP 7 057 951 a winding in the form of prefabricated drums is previously known. However, such a winding has not been used with high-voltage cables.
A conductor is known through US 5,036,165, in which the insulation is provided with an inner and an outer layer of semiconducting pyrolized glassfiber. It is also known to provide conductors in a dynamo-electric machine with such an insulation, as described in US 5,066,881 for instance, where a semiconducting pyrolized glassfiber layer is in contact with the two paral- lei rods forming the conductor, and the insulation in the stator slots is surrounded by an outer layer of semiconducting pyrolized glassfiber. The pyrolized glassfiber material is described as suitable since it retains its resistivity even after the impregnation treatment.
The object of the present invention is to solve the above problems and further improve such machines by simplifying manufacture, facilitating transport and reducing manufacturing and assembly costs. This object is achieved in that the machine according to the invention is given the features defined in the characterizing portion of claim 1.
The invention is primarily intended for use, and its advantages are particularly apparent, with a high- voltage cable of the type built up of a core having a plurality of strands, an inner semi-conducting layer surrounding the core, an insulating layer surrounding the inner semi-conducting layer and an outer semiconducting layer surrounding the insulating layer. Mo- re particularly it relates to such a cable with a diameter in the range of 20-200 mm and a conducting area in the range of 80-3000 mm2. Such applications of the invention thus constitute preferred embodiments.
In the arrangement according to the invention the win- dings are preferably of a type corresponding to cables with solid, extruded insulation, such as those used nowadays for power distribution, e.g. XLPE-cables or cables with EPR-insulation . Such a cable comprises an inner conductor composed of one or more strand parts, an inner semiconducting layer surrounding the conductor, a solid insulating layer surrounding this and an outer semiconducting layer surrounding the insulating layer. Such cables are flexible, which is an important property in this context since the technology for the device according to the invention is based primarily on winding systems in which the winding is formed from cable which is bent during assembly. The flexibility of a XLPE-cable normally corresponds to a radius of curvature of approximately 20 cm for a cable 30 mm in diameter, and a radius of curvature of approximately 65 cm for a cable 80 mm in diameter. In the present application the term "flexible" is used to indicate that the winding is flexible down to a radius of curvature in the order of four times the cable diameter, preferably eight to twelve times the cable diameter.
The winding should be constructed to retain its properties even when it is bent and when it is subjected to layers retain their adhesion to each other in this context. The material properties of the layers are decisive here, particularly their elasticity and relative coefficients of thermal expansion. In a XLPE-cable, for instance, the insulating layer consists of cross- linked, low-density polyethylene, and the semiconducting layers consist of polyethylene with soot and metal particles mixed in. Changes in volume as a result of temperature fluctuations are completely absorbed as changes in radius in the cable and, thanks to the comparatively slight difference between the coefficients of thermal expansion in the layers in relation to the elasticity of these materials, radial expansion can take place without the adhesion between the layers being lost.
The material combinations stated above should be considered only as examples. Other combinations fulfilling the conditions specified and also the condition of being semiconducting, i.e. having resistivity within the range of 10_1-106 ohm-cm, e.g. 1-500 ohm-cm, or 10-200 ohm-cm, naturally also fall within the scope of the invention.
The insulating layer may consist, for example, of a solid thermoplastic material such as low-density polyet- hylene (LDPE) , high-density polyethylene (HDPE) , polypropylene (PP) , polybutylene (PB), polymethyl pentene (PMP) , cross-linked materials such as cross-linked polyethylene (XLPE) , or rubber such as ethylene propylene rubber (EPR) or silicon rubber. The inner and outer semiconducting layers may be of the same basic material but with particles of conducting material such as soot or metal powder mixed in.
The mechanical properties of these materials, particu- larly their coefficients of thermal expansion, are affected relatively little by whether soot or metal powder is mixed in or not - at least in the proportions required to achieve the conductivity necessary according to the invention. The insulating layer and the semiconducting layers thus have substantially the same coefficients of thermal expansion.
Ethylene-vinyl-acetate copolymers/nitrile rubber, butyl graft polyethylene, ethylene-butyl-acrylate-copolymers and ethylene-ethyl-acrylate copolymers may also consti- tute suitable polymers for the semiconducting layers.
Even when different types of material are used as base in the various layers, it is desirable for their coefficients of thermal expansion to be substantially the same. This is the case with combination of the materi- als listed above.
The materials listed above have relatively good elasticity, with an E-modulus of E 500 MPa, preferably <200 MPa.
The elasticity is sufficient for any minor differences between the coefficients of thermal expansion for the materials in the layers to be absorbed in the radial direction of the elasticity so that no cracks appear, or any other damage, and so that the layers are not released from each other. The material in the layers is elastic, and the adhesion between the layers is at le- ast of the same magnitude as the weakest of the materials .
The conductivity of the two semiconducting layers is sufficient to substantially equalize the potential along each layer. The conductivity of the outer semiconducting layer is sufficiently great to enclose the electrical field in the cable, but sufficiently small not to give rise to significant losses due to currents induced in the longitudinal direction of the layer.
Thus, each of the two semiconducting layers essentially constitutes one equipotential surface and the winding, with these layers, will substantially enclose the electrical field within it.
There is, of course, nothing to prevent one or more ad- ditional semiconducting layers being arranged in the insulating layer.
The invention will now be described in more detail with reference to the accompanying drawings in which
Figure 1 shows a schematic section through one phase of a power transformer according to the invention and
Figure 2 shows a cross section through a winding cable used in the transformer according to the invention.
Figure 1 shows a part of a power transformer in section, having a transformer core 11, a low-voltage winding 12 and a high-voltage winding 13. According to the invention the windings are wound onto prefabricated drums 14 and 15. These drums are completely wound at the factory and then transported to the site where the transformer is to be used, where they are a mounted on respective phases of the core (only one phase of the transformer is shown in Figure 1) .
In the example shown in Figure 1 the high-voltage winding 13 is divided into two drums 15 for manufacturing and transport reasons. When the winding is divided into several drums the cables in the individual windings are connected by a cable joint 16 on site.
Figure 2 shows a section through a power cable 1 for use in a dry power transformer according to the present invention. The cable 1 comprises a number of strands 2 consisting of a conductor made of copper, for instance, having circular cross section. This conductor is ar- ranged in the middle of the cable 1. Around the cable is a first semi-conducting layer 3. Around the first semi-conducting layer 3 is an insulating layer 4, e.g. XLPE insulation. Around the insulating layer 4 is a second semi-conducting layer 5. In this case, therefo- re the cable does not include the outer sheath that normally surrounds such cables for power distribution. The cable may be of the size stated in the introduction.
Tubes or ducts for cooling air are arranged between the winding cables to cool the winding in the transformer according to the present invention. These tubes or ducts are suitably arranged in the drums 14 and 15 at manufacture before the transformer is transported to where it is to be used. Thanks to the invention a dry power transformer is achieved which is simpler to manufacture than conventional transformers. The transformer need not be transported as a unit from factory to site, and both transport and assembly become less expensive.
The invention is of course not limited to a power transformer but is also applicable to other electrical machines with stationary parts, such as inductive reactors .

Claims

C L A I M S
1. A winding in an electric machine with stationary parts, the windings being in the form of prefabricated drums (15) onto which the conductor (1) forming the winding is wound, said drums (15) being mounted in the machine on site, characterized in that the winding (13) consists of high-voltage cable (1).
2. A winding as claimed in claim 1, characterized in that the high-voltage cable (1) comprises a core (2) with a plurality of strands, an inner semi-conducting layer (3) surrounding the core (2), an insulating layer (4) surrounding the inner semi-conducting layer and an outer semi-conducting layer (5) surrounding the insulating layer.
3. A winding as claimed in claim 2, characterized in that the high-voltage cable (1) has a diameter in the range of 20-200 mm and a conducting area in the range of 80-3000 mm2.
4. A winding as claimed in any of claims 1-3, wherein the machine constitutes a power transformer having a core (11) with low-voltage and high-voltage cables (12, 13) surrounding the core characterized in that the windings (12, 13) are in the form of prefabricated drums (14, 15) onto which the cable (1) forming the windings (12, 13) is wound, said drums (14, 15) being mounted on the transformer core (11) at the site where the transformer is to be used.
5. A winding as claimed in claim 4 characterized in that the high-voltage coil (13) is divided into a number of drums (15) for each phase, cable joints (16) between the drums (15) being applied during assembly on site.
6. A winding as claimed in claim 1 or 2 characterized in that tubes or ducts for cooling the windings
(12, 13) are arranged in the drums (14, 15) at manufac- ture before, they are transported to the site where the transformer is to be used.
7. A power transformer characterized by a winding as claimed in any of claims 1-6.
8. An inductive reactor characterized by a winding as claimed in any of claims 1-6.
PCT/SE1998/000157 1997-02-03 1998-02-02 A winding in an electric machine with stationary parts WO1998034250A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP98902354A EP0954871A1 (en) 1997-02-03 1998-02-02 A winding in an electric machine with stationary parts
BR9807136-0A BR9807136A (en) 1997-02-03 1998-02-02 Winding on an electric machine with stationary parts.
AU58908/98A AU5890898A (en) 1997-02-03 1998-02-02 A winding in an electric machine with stationary parts
CA002276352A CA2276352A1 (en) 1997-02-03 1998-02-02 A winding in an electric machine with stationary parts
JP53279998A JP2001509961A (en) 1997-02-03 1998-02-02 Electric machine windings with fixed parts
EA199900704A EA002171B1 (en) 1997-02-03 1998-02-02 A winding in an electric machine with stationary parts

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SE9700342-0 1997-02-03
SE9700342A SE511161C2 (en) 1997-02-03 1997-02-03 Winding in electric machine with stationary parts e.g. power transformer
SE9704416A SE9704416D0 (en) 1997-02-03 1997-11-28 Winding in an electric machine with fixed parts
SE9704416-8 1997-11-28

Publications (1)

Publication Number Publication Date
WO1998034250A1 true WO1998034250A1 (en) 1998-08-06

Family

ID=26662868

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/000157 WO1998034250A1 (en) 1997-02-03 1998-02-02 A winding in an electric machine with stationary parts

Country Status (9)

Country Link
EP (1) EP0954871A1 (en)
JP (1) JP2001509961A (en)
KR (1) KR20010049161A (en)
AU (1) AU5890898A (en)
BR (1) BR9807136A (en)
CA (1) CA2276352A1 (en)
EA (1) EA002171B1 (en)
SE (1) SE9704416D0 (en)
WO (1) WO1998034250A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2169692A1 (en) * 2008-09-26 2010-03-31 Bruker Biospin SA High voltage step-up dry power transformer and power supply unit comprising at least one such transformer
US8928441B2 (en) 2010-10-19 2015-01-06 General Electric Company Liquid cooled magnetic component with indirect cooling for high frequency and high power applications
CN110299242A (en) * 2019-07-05 2019-10-01 南京理工大学 A kind of single-phase dry type high frequency transformer

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103268812A (en) * 2013-02-19 2013-08-28 上海兆启新能源科技有限公司 Multichannel equalizing reactor
CN105655111A (en) * 2016-04-11 2016-06-08 谢博 Controllable voltage varying device for aluminum electrolysis
CN106710868A (en) * 2017-04-01 2017-05-24 张艳雪 Winding process of low-voltage series reactor coil
CN112349511A (en) * 2019-08-06 2021-02-09 湖南塞凡电气科技有限公司 Transformer high-voltage and low-voltage winding processing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5036165A (en) * 1984-08-23 1991-07-30 General Electric Co. Semi-conducting layer for insulated electrical conductors

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5036165A (en) * 1984-08-23 1991-07-30 General Electric Co. Semi-conducting layer for insulated electrical conductors

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 16, No. 488; & JP,A,04 179 107 (TOSHIBA CORP) 25 June 1992. *
PATENT ABSTRACTS OF JAPAN, Vol. 18, No. 545; & JP,A,06 196 343 (TOSHIBA CORP) 15 July 1994. *
PATENT ABSTRACTS OF JAPAN, Vol. 95, No. 6; & JP,A,07 057 951 (TOSHIBA CORP) 3 March 1995. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2169692A1 (en) * 2008-09-26 2010-03-31 Bruker Biospin SA High voltage step-up dry power transformer and power supply unit comprising at least one such transformer
US8085122B2 (en) 2008-09-26 2011-12-27 Bruker Biospin Sa High voltage step-up dry power transformer and power supply unit comprising at least one such transformer
US8928441B2 (en) 2010-10-19 2015-01-06 General Electric Company Liquid cooled magnetic component with indirect cooling for high frequency and high power applications
CN110299242A (en) * 2019-07-05 2019-10-01 南京理工大学 A kind of single-phase dry type high frequency transformer

Also Published As

Publication number Publication date
EP0954871A1 (en) 1999-11-10
AU5890898A (en) 1998-08-25
KR20010049161A (en) 2001-06-15
JP2001509961A (en) 2001-07-24
BR9807136A (en) 2000-01-25
SE9704416D0 (en) 1997-11-28
CA2276352A1 (en) 1998-08-06
EA002171B1 (en) 2002-02-28
EA199900704A1 (en) 2000-04-24

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