WO2015007432A1 - Bobine de transformateur sec et transformateur sec - Google Patents

Bobine de transformateur sec et transformateur sec Download PDF

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Publication number
WO2015007432A1
WO2015007432A1 PCT/EP2014/061708 EP2014061708W WO2015007432A1 WO 2015007432 A1 WO2015007432 A1 WO 2015007432A1 EP 2014061708 W EP2014061708 W EP 2014061708W WO 2015007432 A1 WO2015007432 A1 WO 2015007432A1
Authority
WO
WIPO (PCT)
Prior art keywords
dry
type transformer
core
hollow cylindrical
cooling
Prior art date
Application number
PCT/EP2014/061708
Other languages
German (de)
English (en)
Inventor
Benjamin Weber
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
Publication of WO2015007432A1 publication Critical patent/WO2015007432A1/fr

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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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2876—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
    • H01F27/08—Cooling; Ventilating
    • H01F27/085—Cooling by ambient air
    • 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
    • H01F27/327—Encapsulating or impregnating
    • H01F2027/328—Dry-type transformer with encapsulated foil winding, e.g. windings coaxially arranged on core legs with spacers for cooling and with three phases

Definitions

  • the invention relates to the design of a dry-type transformer coil.
  • the invention also relates to a dry-type transformer having a dry-type transformer coil according to the invention.
  • dry-type transformers are used in power distribution networks to adapt to respective voltage levels, for example between 6kV / 10kV / 30kV or 60kV levels. Power ratings of some 100kVA to over 10MVA are common.
  • oil as cooling and insulating agent is indispensable for high-voltage transformers, for example in the voltage level 380kV
  • dry transformers deliberately do not use a liquid cooling or insulating agent due to the lower insulation requirements in the respective lower voltage levels. This offers the advantage of a simplified structure. The insulation or cooling then typically takes place via ambient air. Due to the lower heat capacity compared to oil, the cooling of a dry-type transformer or of the respective dry-type transformer coils with air proves to be difficult and expensive.
  • the object is achieved by a dry-type transformer coil of the aforementioned type. This is characterized in that the filling factor of the hollow-cylindrical intermediate space with cooling channels varies over its radial extent.
  • the basic idea of the invention is to arrange the cooling channels, which are arranged in a hollow cylindrical space of a dry transformer coil, not just with a uniform, but with a non-uniform cooling channel density such that, when a dry-type transformer coil is installed, taking into account the given flow conditions As homogeneous as possible flow through the cooling channels results.
  • a transformer When installed in a transformer, such as a three-phase transformer, dry-type transformer coils are disposed about a respective leg of a transformer core.
  • a three-phase transformer for example, there are core designs with three or five parallel core legs arranged in a common vertical plane, which are connected by a respective core yoke running underneath or above it.
  • Kernjoche therefore shading of the preferably vertical cooling channels, so that there is a different flow resistance for flowing through the cooling air channels.
  • a smaller air flow flows through the shaded cooling ducts than through the unshaded cooling ducts, provided that a homogeneous filling factor with cooling ducts over the entire cross section of the hollow cylindrical space is assumed.
  • a fill factor is defined in the context of the subject invention as the ratio of active cooling channel cross-sectional area over a respective section
  • the filling factor for the subsection concerned would be close to unity.
  • the fill factor in this section would be 50%.
  • a high fill factor in a subsection is therefore equivalent to a low flow resistance.
  • a region-by-region variation of the filling factor can be effected, for example, by a corresponding material thickness of strip elements, by means of which the cooling channels are formed.
  • the dimensioning of the respective suitable filling factor along the circumference of the hollow cylindrical space is based on the given flow conditions and the typical operating parameters of the transformer.
  • a flow through the cooling channels can be done only by natural convection, but the transformer can also have a cooling fan and be installed in a housing.
  • the variation of the filling factor is effected by an at least partially narrowing of at least one axial partial region of at least one cooling channel.
  • the division of the hollow cylindrical space in completely similar cooling channels that is particularly easy to implement.
  • a respective constriction of a cooling channel is effected by a constriction element arranged therein or in front of it.
  • a respective constriction element is made of an insulating material.
  • the insulating ability of the likewise preferred manner made of an insulating material cooling channels is not adversely affected.
  • At least one constriction element is produced from a plurality of modules with different coefficients of thermal expansion.
  • a temperature-dependent narrowing of the cross section of a cooling channel can be achieved in an advantageous manner.
  • the at least one constriction element is designed and arranged such that the flow resistance is reduced by the respective cooling channel with increasing temperature.
  • a locally elevated temperature automatically results in a locally improved cooling effect.
  • a corresponding embodiment includes, for example, a tongue-like constriction element, which projects into the cooling channel and similar to the behavior of a bimetallic strip has a temperature-dependent bending behavior. At an elevated temperature, the bend is reduced and an increased cross-section of the cooling channel is released.
  • a dry-type transformer comprising a transformer core with at least two core yokes and with at least two core limbs, wherein a dry-type transformer coil according to the invention is arranged around at least one core limb, wherein the fill factor of the hollow-cylindrical gap is varied in such a way that it flows in from the core yokes frontally shaded areas is higher than in the unshaded areas.
  • this results in a homogeneous flow through the respective cooling channels with coolant, such as air, at least for a preferred operating state of the dry-type transformer despite the shadowing.
  • the latter is forcedly cooled and therefore has, for example, a conveying means for cooling air, for example a blower.
  • a conveying means for cooling air for example a blower.
  • the pressure conditions at the front-side inlets of the respective cooling channels arising from a fan must be considered when designing a suitable filling factor distribution.
  • FIG. 2 shows an exemplary core leg with a dry-type transformer coil
  • FIG. 3 shows an exemplary transformer core with dry-transformer coils.
  • FIG. 1 shows an exemplary dry-type transformer coil 10 in a plan view of one of the two end faces. Around a central axis, a first 12 and a second 14 winding of the dry-type transformer coil 10 are nested in each other and spaced from one another. In a hollow-cylindrical intermediate space 16 formed by the spacing, several exemplary explanations are given in FIG. Cut 18, 20, 22, 24, 26, 28 given several examples of arrangements of cooling channels 30, 32, 34, 36, each with different filling factors.
  • Cooling channels 30 are provided in the first 18 and second 20 sections, which are tangentially spaced in the first section 18, which results in a lower filling factor than in the second section 20, where the cooling channels 30 are tangent to one another.
  • the third section 22 again tangentially adjacent cooling channels 32 are arranged, which, however, have a respective constriction element 38 in their interior, so that a reduced filling factor is also given in the third section.
  • Cooling channels 34 of smaller diameter than the cooling channels 30 and 32 are arranged in the fourth 24 and fifth 26 sections. In the fourth section 24, these are arranged tangentially adjacent one another in a single layer and tangentially adjacent to each other in the fifth section 26 so that the fifth section 26 has an approximately twice the filling factor as the fourth section 24.
  • tangentially arranged strip elements are provided for spacing, the thickness of which ultimately determines the filling factor in the sixth section.
  • FIG. 2 shows an exemplary core leg 42 with a dry-type transformer coil in a diagram 40.
  • the core leg 42 is aligned along a rotation axis 44 around which radially symmetrically arranged first 46 and second 48 windings of the transformer coil are arranged.
  • a cooling channel 50 is formed at the upper end of a constriction element 50 is inserted.
  • Cooling air enters from the lower end face in the cooling channel 50 and at its upper end face again out, as indicated by the arrows with the reference numeral 54 and 56.
  • FIG. 3 shows an exemplary transformer core with dry-transformer coils 62, 64, 66 arranged thereon in a plan view 60.
  • the transformer core has three legs, which are connected at their two respective ends to a yoke 70 extending transversely thereto.
  • Respective cooling channels are formed in respective hollow cylindrical spaces 68 of the dry-type transformer coils 62, 64, 66.
  • the upper 70 and lower yokes are spaced from the respective axial end faces of the dry-transformer coils 62, 64, 66 so that airflow in the shadowed areas 72, 74, 76, 78 can not enter the cooling passages unhindered.
  • the constriction point formed as a result is compensated by an increased fill factor in the corresponding regions of the hollow-cylindrical intermediate space, so that an approximately equal flow resistance results for the all cooling channels taking into account a respective shading.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

L'invention concerne une bobine de transformateur sec (10, 62, 64, 66), comprenant au moins deux enroulements (12, 14, 46, 48) ou parties d'enroulements en forme de cylindres creux emboîtés les uns dans les autres et espacés les uns des autres dans le sens radial, des conduits de refroidissement (30, 32, 34, 36, 50) qui s'étendent dans le sens axial étant disposés dans l'interstice (16, 68) en forme de cylindre creux formé par l'écartement. Le coefficient de remplissage de l'interstice (16, 68) en forme de cylindre creux par les conduits de refroidissement (30, 32, 34, 36, 50) varie sur sa périphérie radiale. L'invention concerne également un transformateur sec (60), comprenant un noyau de transformateur qui possède au moins deux culasses (70) et au moins deux branches de noyau (42), une bobine de transformateur sec (10, 62, 64, 66) selon l'invention étant disposée autour d'au moins une desdites branches (42). Le coefficient de remplissage de l'interstice (16, 68) en forme de cylindre creux varie de telle sorte qu'il est plus élevé dans les zones (72, 74, 76, 78) occultées à l'avant par les culasses (70) que dans les zones non occultées.
PCT/EP2014/061708 2013-07-17 2014-06-05 Bobine de transformateur sec et transformateur sec WO2015007432A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP13003609.8A EP2827346B1 (fr) 2013-07-17 2013-07-17 Transformateur sec
EP13003609.8 2013-07-17

Publications (1)

Publication Number Publication Date
WO2015007432A1 true WO2015007432A1 (fr) 2015-01-22

Family

ID=48832736

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2014/061708 WO2015007432A1 (fr) 2013-07-17 2014-06-05 Bobine de transformateur sec et transformateur sec

Country Status (3)

Country Link
EP (1) EP2827346B1 (fr)
ES (1) ES2616270T3 (fr)
WO (1) WO2015007432A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018208363A1 (de) * 2018-05-28 2019-11-28 Robert Bosch Gmbh Spulenanordnung für eine elektrische Maschine für ein Kraftfahrzeug, elektrische Maschine sowie Verfahren zum Herstellen einer derartigen Spulenanordnung
WO2021081977A1 (fr) 2019-11-01 2021-05-06 Abb Power Grids Switzerland Ag Ensemble d'isolation, ensemble transformateur et transformateur de type sec

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368530B1 (en) * 1999-12-16 2002-04-09 Square D Company Method of forming cooling ducts in cast resin coils
EP1715495A2 (fr) * 2005-04-21 2006-10-25 TMC Italia S.p.A. Transformateur du type sec isolés par une résine
EP2439755A1 (fr) * 2010-10-08 2012-04-11 ABB Technology AG Transformateur électrique de type sec
CN202189656U (zh) * 2011-08-11 2012-04-11 天津市特变电工变压器有限公司 一种采用空心气道条的箔绕线圈
EP2472533A1 (fr) * 2011-01-04 2012-07-04 ABB Technology AG Enroulement de transformateur doté d'un canal de refroidissement
CN202473553U (zh) * 2012-02-29 2012-10-03 山东威特变压器厂 干式变压器
EP2549495A1 (fr) * 2011-07-18 2013-01-23 ABB Technology AG Transformateur à sec

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2793244B1 (fr) * 2013-04-17 2015-07-08 ABB Technology AG Bobine de transformateur à sec et transformateur à sec

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6368530B1 (en) * 1999-12-16 2002-04-09 Square D Company Method of forming cooling ducts in cast resin coils
EP1715495A2 (fr) * 2005-04-21 2006-10-25 TMC Italia S.p.A. Transformateur du type sec isolés par une résine
EP2439755A1 (fr) * 2010-10-08 2012-04-11 ABB Technology AG Transformateur électrique de type sec
EP2472533A1 (fr) * 2011-01-04 2012-07-04 ABB Technology AG Enroulement de transformateur doté d'un canal de refroidissement
EP2549495A1 (fr) * 2011-07-18 2013-01-23 ABB Technology AG Transformateur à sec
CN202189656U (zh) * 2011-08-11 2012-04-11 天津市特变电工变压器有限公司 一种采用空心气道条的箔绕线圈
CN202473553U (zh) * 2012-02-29 2012-10-03 山东威特变压器厂 干式变压器

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Publication number Publication date
EP2827346A1 (fr) 2015-01-21
ES2616270T3 (es) 2017-06-12
EP2827346B1 (fr) 2016-11-16

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