EP2819133A1 - Dispositif de bobine électrique pour des applications électroniques de puissance et électrotechniques - Google Patents

Dispositif de bobine électrique pour des applications électroniques de puissance et électrotechniques Download PDF

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Publication number
EP2819133A1
EP2819133A1 EP13173505.2A EP13173505A EP2819133A1 EP 2819133 A1 EP2819133 A1 EP 2819133A1 EP 13173505 A EP13173505 A EP 13173505A EP 2819133 A1 EP2819133 A1 EP 2819133A1
Authority
EP
European Patent Office
Prior art keywords
coil
coil device
magnetic shell
magnetic
shell
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.)
Withdrawn
Application number
EP13173505.2A
Other languages
German (de)
English (en)
Inventor
Luc GROSJEAN
Sebastien Guberti
Stephane Isler
Toufann Chaudhuri
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.)
ABB Schweiz AG
Original Assignee
ABB Technology AG
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 ABB Technology AG filed Critical ABB Technology AG
Priority to EP13173505.2A priority Critical patent/EP2819133A1/fr
Publication of EP2819133A1 publication Critical patent/EP2819133A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/08—Cooling; Ventilating
    • H01F27/10—Liquid cooling
    • H01F27/12—Oil cooling
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • H01F37/005—Fixed inductances not covered by group H01F17/00 without magnetic core

Definitions

  • the present invention relates to electric devices, in particular to housings for such electric devices.
  • converters are used to convert AC or DC electrical power from a power source, such as an electric power grid, to AC or DC voltage and/or current which is needed for the load or the device to be operated.
  • the power electronic traction transformer in such an AC-traction application comprises a power electronic circuit with at least one multilevel converter connected to the grid and uses medium frequency transformer (MFT) for isolation purposes.
  • MFT medium frequency transformer
  • Such circuitry of a PETT is shown in Figure 4 .
  • the use of the power electronic traction transformer requires the use of an input choke on grid side used to limit a short circuit current, to control the power flow and to smooth the AC input current. There is an important focus on weight and size of the input choke which may substantially affects the overall weight and size of the system.
  • the bulky conventional transformers are housed in an oil container filled with oil to provide electrical insulation and uniform heat dissipation away from the windings of the transformer. Cooling of potential auxiliary choke(s) required by the customer can easily be managed by placing the choke(s) in the oil container together with the transformer without the need to substantially increase the size of the oil container.
  • a conventional input choke has a coil with a number of windings and an air core. Owing to the air core, the inductivity can be kept unaffected by the current it carries, thus efficiently limiting a short circuit current, if necessary.
  • the coil is surrounded by a magnetic shell to guide the magnetic flux produced by the coil around the windings, thereby preventing an induction of Foucault currents into the walls of the oil container and enabling compliance with EMC rules.
  • a coil device for use with high-voltage/high-power applications for providing inductivity, comprising:
  • the coil may be immersed in the insulating liquid oil.
  • the coil device is to use the magnetic shell, which at least partly surrounds the coil for guiding a magnetic field produced by the coil when operated between the axial ends of the coil, as walls or as housing for the oil container of a conventional shell-type coil device.
  • the coil device has a coil with a number of windings which is provided within a magnetic shell.
  • the magnetic shell magnetically couples one end of the coil with the opposite end thereof.
  • the magnetic shell substantially encompasses the coil and can be of a cylindrical shape, so that the magnetic shell can form a container for keeping the oil or an oil container can be enclosed by the magnetic shell.
  • the coil is kept in an oil volume without the need of an additional oil container in which the coil device, including the magnetic shell, is immersed.
  • a substantial weight reduction is achieved firstly by omitting the additional oil container and secondly by reducing the amount of oil since the volume of the casing built in/by the interior of the magnetic shell to keep the oil is much smaller than the volume of an oil container surrounding the magnetic shell of the electric coil device.
  • the inner volume may be formed by the magnetic shell.
  • the magnetic shell has end faces which are covered with end covers to tightly enclose the inner volume.
  • the open axial ends of the coil device are thus substantially covered with portions of the magnetic shell, wherein the axial ends of the magnetic shell are tightly closed, so that the inner volume of the magnetic shell can hold the oil contained in it.
  • a terminal for electrically connecting the coil may pass through at least one of the end covers.
  • the end covers may be made of metal, insulating material or metal coated with an insulating material.
  • the inner volume may be formed by an enclosure fully enclosed by the magnetic shell and accommodating the coil, wherein the enclosure is made of a non-magnetic material.
  • the enclosure may be further formed by a lateral wall and portions of the magnetic shell covering end faces of the coil.
  • the magnetic shell may be formed by first portions covering the end faces of the coil and at least one second portion connecting the first portions on at least one side of the coil.
  • the magnetic shell has a cylindrical body having an axis which is perpendicular to the coil axis.
  • a system comprising:
  • Figures 1 a and 1 b show a perspective view of a coil device 1 without an end cover and a cross-sectional view of the coil device 1, respectively.
  • the coil device 1 is made for providing a constant inductivity and can be used as an input choke for e.g. high-voltage/high-power applications, such as in combination with a power electronic traction transformer, a conventional transformer or any other power electrical arrangement. Other applications may use the coil device 1 as a current-limiting reactor, a smoothing reactor, a harmonic filter reactor, a damping reactor, a power flow control reactor or the like.
  • the coil device 1 can be a stand-alone device or can be a functional part of a conventional transformer arrangement or of any other electrical device, including one or more coils 2.
  • the coil device 1 comprises a coil 2 having single-layer windings, e. g. forming a cylindrical body with an annular cross section.
  • the coil 2 can have multi-layer windings and can be cylindrical with differently shaped cross-sections such as square or rectangular cross-sections.
  • the coil 2 is housed and mounted in a magnetic shell 3 having soft magnetic properties and being configured to encompass the coil 2 in a plane parallel to an axis of the cylindrical body of the coil2.
  • the magnetic shell 3 provides first portions 31 covering the end faces of the cylindrical body of the coil 2 and second portions 32 extending parallel to the axis of the coil 2 on at least two lateral surfaces.
  • the magnetic shell 3 forms a rectangular box with its first and second portions 31, 32 and with two open end faces.
  • the magnetic shell 3 can be formed as a cylinder having a non-rectangular cross section or a circular cross section.
  • the axis of the cylindrical magnetic shell 3 is perpendicular to the axis of the cylindrical body of the coil 2.
  • Substantially the length of the magnetic shell 3 between the end faces may be larger than the diameter or dimension of the coil 2 housed therein in the same direction, so that the coil 2 is fully enclosed in the magnetic shell 3.
  • the open end faces of the magnetic shell 3 are closed with end covers 4, such as to tightly keep oil within an inner volume 5 formed by the magnetic shell 3 and the end covers 4.
  • the inner volume 5 is filled with oil.
  • the coil 2 is mounted within the magnetic shell 3 such that the outer surface of the windings is spaced from the inner surfaces of the walls of the magnetic shell 3, thereby providing electrical insulation. Furthermore, the coil 2 is filled with oil to reduce insulation distances and cool the windings. As there is no magnetic material which passes through the axis of the coil the inductivity is kept unaffected by the current it carries.
  • the coil 2 has electrical terminals 7 which pass through one of the end covers 4.
  • Figure 2 shows a tight enclosure 6 surrounding the cylindrical body of the coil 2, wherein the oil is kept only within the volume of the tight enclosure 6, so that the magnetic shell 3 does not come into contact with the oil.
  • the tight enclosure 6 encompasses the cylindrical body of the coil 2 on a lateral surface thereof, using the inner walls of the first portions 31 of the magnetic shell 3 at the end faces of the coil 2 to provide the tight oil-filled volume or it can provide a closed container fully housing the coil 2 which is contained within the magnetic shell 3.
  • the material of the enclosure 6 is preferably a non-magnetic material and either made of insulating material or insulated, such as by a coating, with respect to the windings of the coil 2.
  • Figure 3 shows a perspective view onto the closed coil device 1, where the end faces of the magnetic shell 3 are closed with metal covers, such as plates made of aluminum, which can be soldered or attached with other suitable attachment means onto the end faces of the magnetic shell 3.
  • Another attachment means is, e. g., riveting with the provision of a gasket.
  • end covers 4 can also be fully made of insulating material or the surface of a metal cover can be coated with an insulating material, e. g. with epoxy.
  • the tightness of the magnetic shell 3 can be achieved through various processes. For instance, the magnetic shell 3 with its closed end faces can be dipped into a liquid coating, such as epoxy or polyester, which helps to reinforce the tightness of the casing or the liquid coating can be poured into low-thickness hollows previously created on each of the faces of the magnetic shell 3, followed by curing of the coating.
  • a liquid coating such as epoxy or polyester
  • the assembly of the coil device 1 provides a high weight reduction, in particular because the required amount of oil is substantially reduced. Furthermore, also the size of the system as shown in figure 4 in which the coil device 1 is implemented, in particular is connected between the grid and the power electronic traction transformer, can be essentially reduced as a separate oil container is no longer needed for the coil device 1.
  • Reference list 1 coil device 2 coil 3 magnetic shell 31 first portion of the magnetic shell 32 second portion of the magnetic shell 4 end cover 5 inner volume 6 enclosure 7 terminal

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP13173505.2A 2013-06-25 2013-06-25 Dispositif de bobine électrique pour des applications électroniques de puissance et électrotechniques Withdrawn EP2819133A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13173505.2A EP2819133A1 (fr) 2013-06-25 2013-06-25 Dispositif de bobine électrique pour des applications électroniques de puissance et électrotechniques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13173505.2A EP2819133A1 (fr) 2013-06-25 2013-06-25 Dispositif de bobine électrique pour des applications électroniques de puissance et électrotechniques

Publications (1)

Publication Number Publication Date
EP2819133A1 true EP2819133A1 (fr) 2014-12-31

Family

ID=48692308

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13173505.2A Withdrawn EP2819133A1 (fr) 2013-06-25 2013-06-25 Dispositif de bobine électrique pour des applications électroniques de puissance et électrotechniques

Country Status (1)

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EP (1) EP2819133A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023177175A (ja) * 2022-06-01 2023-12-13 株式会社美鈴工業 プレーナ構造コイルユニット

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1253811B (de) * 1959-02-16 1967-11-09 Acec Luftdrosselspule
US3362001A (en) * 1966-07-28 1968-01-02 Allis Chalmers Mfg Co Coreless iron shunt reactor having high dielectric strength insulation
US4298853A (en) * 1980-03-27 1981-11-03 General Electric Company Compact high voltage shunt reactor
EP0618596A1 (fr) * 1993-04-02 1994-10-05 Smit Transformatoren B.V. Bobine de self à noyau d'air

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1253811B (de) * 1959-02-16 1967-11-09 Acec Luftdrosselspule
US3362001A (en) * 1966-07-28 1968-01-02 Allis Chalmers Mfg Co Coreless iron shunt reactor having high dielectric strength insulation
US4298853A (en) * 1980-03-27 1981-11-03 General Electric Company Compact high voltage shunt reactor
EP0618596A1 (fr) * 1993-04-02 1994-10-05 Smit Transformatoren B.V. Bobine de self à noyau d'air

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023177175A (ja) * 2022-06-01 2023-12-13 株式会社美鈴工業 プレーナ構造コイルユニット

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