EP1665298A2 - Leiter für flüssigkeitsgekühlte wicklungen - Google Patents
Leiter für flüssigkeitsgekühlte wicklungenInfo
- Publication number
- EP1665298A2 EP1665298A2 EP04786732A EP04786732A EP1665298A2 EP 1665298 A2 EP1665298 A2 EP 1665298A2 EP 04786732 A EP04786732 A EP 04786732A EP 04786732 A EP04786732 A EP 04786732A EP 1665298 A2 EP1665298 A2 EP 1665298A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductor
- layer
- outer layer
- liquid
- sheathing
- 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.)
- Granted
Links
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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/322—Insulating of coils, windings, or parts thereof the insulation forming channels for circulation of the fluid
-
- 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
- H01F27/323—Insulation between winding turns, between winding layers
Definitions
- the invention relates to a conductor for liquid-cooled windings, in particular for transformer or choke coil windings according to the preamble of the main claim.
- the invention further relates to a corresponding liquid-cooled transformer and a liquid-cooled throttle coil.
- a winding of an oil-filled transformer or similar electrical device of higher power, formed from a generic conductor, is regularly interspersed with cooling channels for guiding a cooling liquid, such as oil, in order to dissipate heat generated by ohmic losses.
- the heat generated in the conductor must be provided by an insulating sheathing, which is typically made of paper, which is usually in direct contact with the conductor, and an insulating sheathing which forms on a surface of this sheathing
- Penetrate boundary layer A temperature gradient occurs in the sheath as well as in the boundary layer and thus a temperature difference between the conductor and the coolant. Given the size of the heat to be dissipated, this temperature difference is a determining variable for the dimensions of the conductor and the corresponding winding to be selected.
- the invention is therefore based on the object of developing a conductor for liquid-cooled windings which permits improved cooling even when operating at higher voltages and thus enables the design of corresponding electrical devices with smaller dimensions.
- the conductor has an insulating sheath surrounding it as a whole, at least one layer of the sheathing completely covering the conductor, but at the same time having an outer layer of at least two layers of the sheathing having openings, meshes or fraying, on the one hand makes a good electrical one Insulation of the conductor is achieved, which is therefore also suitable for operation with very high voltages, and on the other hand a surface of the conductor or the jacket of the conductor, which is structured in such a way that a cooling liquid flowing around the conductor or at least one applied to the conductor Boundary layer of this coolant is turbulent.
- the latter leads to a significantly improved heat exchange on the surface of the conductor, thereby improving the cooling effect due to the cooling liquid flowing around the conductor.
- liquid-cooled choke coils or transformers in which at least one, preferably each winding consists of a conductor of the type described can be realized in an advantageous manner compared to corresponding devices according to the prior art with smaller dimensions and / or a suitability for larger operating voltages ,
- the described advantage of improved cooling is achieved here, although the cooling liquid cannot flow through the sheathing and therefore cannot flow around the latter individually even if the conductor is constructed from several partial conductors.
- Frayed parts which the outer layer of the sheathing for turbulence generation can have instead of or in addition to openings and / or meshes, are to be referred to in this document as parts of the layer mentioned projecting like a flag.
- a layer of the sheathing of the conductor can be formed by wrapping the conductor with a flat material, preferably by wrapping it with a strip that spirally surrounds the conductor. This enables a very simple production of the casing or the corresponding position of the casing. Of course, several or all layers of the casing can also be formed in this way.
- a material that is very suitable for one or more layers of the sheathing is paper, which is well insulating, inexpensive and easy to process due to its high flexibility.
- the layer or layers, which form a part of the sheathing that completely surrounds the conductor can each consist of a simple paper strip.
- the outer layer can also consist of paper, which can be perforated to form the openings and thereby to a desired surface. leads the leader.
- the outer layer consists of a tape wound spirally around the conductor, which has an edge which is not cut at too great a distance, so that this edge forms tabs or frayings which protrude from the conductor and which flow the coolant influence in the desired way.
- the distances between individual incisions in the strip which can also vary, can be, for example, between a tenth and a fifth of a diameter of the conductor for a particularly good swirling effect. Even with such a design of the outer layer of the casing, its manufacture from paper offers itself.
- a mesh or fabric is used for this layer.
- a net or fabric can consist of plastic or synthetic fibers, for example of polyamide or nylon.
- the flow of the cooling liquid or its boundary layer is not only limited locally, but is manipulated on the entire surface of the conductor, thereby achieving better heat exchange not only locally but over a large area.
- a perforated or apertured version of the outer This effect is particularly good at a higher location if the openings have a diameter of between 2 mm and 10 mm, with typical cooling liquids and flow velocities, openings of a diameter of between 3 mm and 7 mm prove to be optimal.
- Oils and ester liquids are particularly suitable as coolants for windings which are formed by such conductors.
- These cooling liquids are characterized by a suitable viscosity and expedient heat resistance.
- the inner layer of the sheath which completely surrounds the conductor, or an inner layer of the conductor, which may be formed from several layers, completely covers the conductor Sheath has a thickness of between 0.1 mm and 2 mm.
- This layer or layer should not be thicker than necessary, in order not to impair the cooling of the conductor more than necessary, for common uses, a thickness of this layer or layer of between 0.2 mm and 1 mm means a good compromise.
- the conductor consists of a plurality of individual partial conductors which are guided essentially in parallel and can be twisted.
- Another advantage lies in the possible reduction of eddy currents in the conductor and the associated loss of power and heat. This not only gives the conductor more advantageous electrical properties, it also simplifies the cooling of the conductor even further by reducing the heat generated, and makes it possible to construct an appropriate electrical device in an even more compact manner. This effect can be achieved with little effort if the conductor consists of between five and one hundred and ninety-eight sub-conductors.
- the conductor can also be designed as a twin twisted pair.
- An embodiment of conductors according to the invention for liquid-cooled windings is particularly suitable for conductors which have a cross section of between 0.2 cm 2 and 40 cm 2 , but better not more than 16 cm 2 , and therefore for operation with high voltages and thus usually associated high currents are suitable, but on the other hand still allow effective cooling by a cooling liquid flowing around the conductor as a whole.
- Such conductors are particularly easy to process into windings if they have a rectangular cross section, which is easy to implement, in particular if the structure is made up of several partial conductors.
- FIG. 1 shows a perspective view of one end of a conductor according to the invention
- FIG. 2 shows the same representation of an end of another conductor according to the invention
- FIG. 3 again shows a perspective view of a further exemplary embodiment of a conductor according to the invention.
- FIG. 1 shows a conductor 1 which has a sheath consisting of an inner layer 2 and an outer layer 3.
- the inner layer 2 forms a conventional paper insulation, that is to say is realized by paper wrapping, and surrounds the conductor 1 in such a way that it completely covers it.
- the outer layer 3, which also consists of a wrapping with a paper strip, has a perforation formed by openings 4. These openings 4 have a diameter of approximately 4 mm and cover the outer layer 3 in such a way that it only covers approximately 60% of the inner layer 2 lying underneath.
- the conductor 1, which forms a winding of an oil-cooled transformer, or the sheathing of this conductor 1 is thereby given a surface structure which causes a flow of a synthetic oil serving as a coolant to turbulence, at least on this surface, and thereby leads to improved heat exchange and more effective cooling of the conductor 1 leads.
- the conductor 1, which consists of thirty-five sub-conductors, has a cross section of approximately 5.5 cm 2 .
- the perforated design of the outer layer 3 of the sheathing of this conductor 1 results in a very effective cooling of this conductor 1 by the effect described, although the coolant, due to the insulating inner layer 2, which has a thickness of approximately 0.5 mm, the partial conductor of the conductor 1 can not flow around individually.
- FIG. 2 Another embodiment of the invention is shown in FIG. 2.
- a conductor 1 with a sheath which consists of an inner layer 2 and an outer layer 3, can again be seen.
- the outer layer 3 of the casing is formed here by a nylon mesh which has meshes 5 with a diameter of approximately 8 mm and thereby has a similar effect of swirling a flowing cooling liquid.
- FIG. 3 A further exemplary embodiment of the invention is finally shown in FIG. 3, in which an actual conductor 1 as well as an inner layer 2 and an outer layer 3 can be seen again.
- the outer layer 3 is realized here by wrapping the conductor 1 and the inner layer 2 lying underneath with a paper strip, this paper strip here having an edge cut in at regular intervals instead of perforation. As a result, this edge forms protruding flags 6.
- the outer layer 3 has fraying 6 with these flags, which in turn result in turbulence formation in a cooling liquid flowing past.
- the conductors shown in FIGS. 1 to 3 are equally suitable for use in liquid-cooled choke coils or similar electrical devices with liquid-cooled windings.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Of Transformers For General Uses (AREA)
- Transformer Cooling (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10345664A DE10345664B4 (de) | 2003-09-25 | 2003-09-25 | Leiter für flüssigkeitsgekühlte Wicklungen |
PCT/DE2004/002010 WO2005031768A2 (de) | 2003-09-25 | 2004-09-06 | Leiter für flüssigkeitsgekühlte wicklungen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1665298A2 true EP1665298A2 (de) | 2006-06-07 |
EP1665298B1 EP1665298B1 (de) | 2012-08-01 |
Family
ID=34384342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04786732A Expired - Lifetime EP1665298B1 (de) | 2003-09-25 | 2004-09-06 | Leiter für flüssigkeitsgekühlte wicklungen |
Country Status (6)
Country | Link |
---|---|
US (1) | US7655867B2 (de) |
EP (1) | EP1665298B1 (de) |
CN (1) | CN100550223C (de) |
DE (1) | DE10345664B4 (de) |
ES (1) | ES2388433T3 (de) |
WO (1) | WO2005031768A2 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6377336B2 (ja) * | 2013-03-06 | 2018-08-22 | 株式会社東芝 | インダクタ及びその製造方法 |
CN106104707B (zh) * | 2013-12-26 | 2019-05-10 | 古河电气工业株式会社 | 绝缘电线、马达线圈、电气/电子设备和绝缘电线的制造方法 |
CA2966540A1 (en) * | 2014-11-03 | 2016-05-12 | Hubbell Incorporated | Intrinsically safe transformers |
JP6372320B2 (ja) * | 2014-11-19 | 2018-08-15 | 日立金属株式会社 | 同軸ケーブル及びそれを用いた医療用ケーブル |
US10679784B1 (en) * | 2016-07-29 | 2020-06-09 | Vanner, Inc. | Method of forming a transformer winding |
JP6972167B2 (ja) * | 2017-05-10 | 2021-11-24 | アーベーベー・シュバイツ・アーゲーABB Schweiz AG | 熱除去が改善された電気装置 |
US20200090832A1 (en) * | 2018-09-19 | 2020-03-19 | Michael Revilak | Direction indicating cord assembly |
DE102020109211A1 (de) | 2020-04-02 | 2021-10-07 | Schaeffler Technologies AG & Co. KG | Leistungserzeugende Komponente einer elektrischen Rotationsmaschine und elektrische Rotationsmaschine |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1287684B (de) * | 1969-01-23 | |||
DE1638928A1 (de) | 1967-10-16 | 1971-08-05 | Transform Roentgen Matern Veb | Transformator mit Lagenwicklung und erzwungener OElstroemung |
DE2316830A1 (de) | 1973-04-04 | 1974-10-17 | Transformatoren Union Ag | Vorrichtung zur verbesserung der kuehlung von transformatoren mit lagenwicklung |
US4096351A (en) * | 1976-08-24 | 1978-06-20 | Borg-Warner Corporation | Insulated and braid covered electrical conductor for use in gassy oil wells |
US4088830A (en) * | 1976-08-24 | 1978-05-09 | Borg-Warner Corporation | Electrical cable with insulated and braid covered conductors and perforated polyolefin armor |
US4675474A (en) * | 1985-09-04 | 1987-06-23 | Harvey Hubbell Incorporated | Reinforced electrical cable and method of forming the cable |
DE3823938A1 (de) * | 1988-07-14 | 1990-02-01 | Siemens Ag | Isolation um einen stabilisierten supraleiter und verfahren zu deren herstellung |
AT399962B (de) | 1992-09-16 | 1995-08-25 | Asta Eisen Und Metallwarenerze | Drilleiter |
DE4243090C1 (de) | 1992-12-18 | 1994-07-28 | Siemens Ag | Distanzelement |
ATE154465T1 (de) | 1994-05-10 | 1997-06-15 | Asta Elektrodraht Gmbh | Mehrfachparallelleiter für wicklungen elektrischer maschinen und geräte |
DE4427282C2 (de) * | 1994-08-02 | 1999-11-04 | Kabelmetal Electro Gmbh | Verfahren zur Herstellung eines koaxialen Hochfrequenz-Kabels |
US6051793A (en) | 1998-05-22 | 2000-04-18 | Alcatel | Multiple parallel conductor featuring conductors partially wrapped with an aramid or other suitable wrapping material |
DE29914596U1 (de) * | 1999-08-20 | 2000-01-13 | Alcatel, Paris | Mehrfachparallelleiter für Wicklungen elektrischer Geräte und Maschinen |
CA2344564C (en) * | 2000-09-14 | 2008-07-22 | General Electric Canada Inc. | Graded electric field insulation system for dynamoelectric machine |
-
2003
- 2003-09-25 DE DE10345664A patent/DE10345664B4/de not_active Expired - Fee Related
-
2004
- 2004-09-06 WO PCT/DE2004/002010 patent/WO2005031768A2/de active Application Filing
- 2004-09-06 ES ES04786732T patent/ES2388433T3/es not_active Expired - Lifetime
- 2004-09-06 US US10/595,197 patent/US7655867B2/en not_active Expired - Fee Related
- 2004-09-06 EP EP04786732A patent/EP1665298B1/de not_active Expired - Lifetime
- 2004-09-06 CN CNB2004800276980A patent/CN100550223C/zh not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2005031768A2 * |
Also Published As
Publication number | Publication date |
---|---|
DE10345664B4 (de) | 2008-11-13 |
CN1856848A (zh) | 2006-11-01 |
EP1665298B1 (de) | 2012-08-01 |
ES2388433T3 (es) | 2012-10-15 |
WO2005031768A3 (de) | 2005-06-23 |
DE10345664A1 (de) | 2005-05-12 |
CN100550223C (zh) | 2009-10-14 |
US7655867B2 (en) | 2010-02-02 |
WO2005031768A2 (de) | 2005-04-07 |
US20070277994A1 (en) | 2007-12-06 |
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