EP2827346B1 - Transformateur sec - Google Patents

Transformateur sec Download PDF

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Publication number
EP2827346B1
EP2827346B1 EP13003609.8A EP13003609A EP2827346B1 EP 2827346 B1 EP2827346 B1 EP 2827346B1 EP 13003609 A EP13003609 A EP 13003609A EP 2827346 B1 EP2827346 B1 EP 2827346B1
Authority
EP
European Patent Office
Prior art keywords
dry
cooling
type transformer
cooling channels
core
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.)
Active
Application number
EP13003609.8A
Other languages
German (de)
English (en)
Other versions
EP2827346A1 (fr
Inventor
Benjamin Weber
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 Schweiz 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 Schweiz AG filed Critical ABB Schweiz AG
Priority to EP13003609.8A priority Critical patent/EP2827346B1/fr
Priority to ES13003609.8T priority patent/ES2616270T3/es
Priority to PCT/EP2014/061708 priority patent/WO2015007432A1/fr
Publication of EP2827346A1 publication Critical patent/EP2827346A1/fr
Application granted granted Critical
Publication of EP2827346B1 publication Critical patent/EP2827346B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 a dry-type transformer with a dry-type transformer coil.
  • 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. While the use of oil as cooling and insulating means is indispensable for high-voltage transformers, for example at the 380kV voltage level, dry transformers deliberately do not use a liquid cooling or insulating agent due to the lower insulation requirements in the corresponding underlying voltage levels. This offers the advantage of a simplified structure. The insulation or cooling then typically takes place via ambient air.
  • the patent document EP 2 549 495 A1 discloses a dry-type transformer for mobile applications, comprising a transformer core and at least one radially inner first and one radially outer second wound around a common winding axis and penetrated by the transformer core hollow cylindrical winding segment, which are nested and radially spaced from each other, so that therebetween, a hollow cylindrical cooling channel pronounced is, wherein for spacing spacer elements are provided, which are arranged such that the cooling passage in the axial direction of a coolant can be flowed through.
  • the patent document EP 2 439 755 A1 discloses a dry type transformer having a core, a radially inner and a radially spaced outer winding, wherein in the intermediate used as a cooling channel hollow cylindrical space a plurality of hollow cylindrical electrical insulation barriers are arranged. Support strips are provided in the axial direction, so that a radial circumferential subdivision into individual cooling channels is effected.
  • EP 1 715 495 A2 discloses a resin insulated dry type transformer according to the preamble of claim 1 (see Fig.2 ).
  • 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 in such a way that in the installed state of a dry transformer coil 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 transformer core In 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.
  • flows through the shadowed cooling channels due to the higher flow resistance a lower air flow than through the unshaded cooling channels, if a homogeneous Fill factor with cooling channels over the entire cross section of the hollow cylindrical space is required.
  • 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 portion of the base of the hollow cylindrical space to the base itself.
  • the filling factor would be close to one for the relevant subsection.
  • 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-wise variation of the filling factor can be effected for example by a corresponding material thickness of strip elements, by 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 partial narrowing of at least one axial partial area of at least one cooling channel.
  • the division of the hollow cylindrical space into completely identical cooling channels is namely particularly easy to implement.
  • a respective constriction of a cooling channel takes place therein or before arranged constriction element.
  • These offer the advantage that they can be used later in already manufactured cooling channels of dry transformer coils and therefore require little additional effort.
  • constriction elements which can be used directly in a cooling channel and narrow these areas, but there are also dazzle elements conceivable, which are arranged directly on an axial end face of a respective cooling channel.
  • 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 made of 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 tongue-like constriction element, which protrudes 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.
  • the fill factor of the hollow cylindrical space is varied so as to be higher in areas shaded from the core yokes than in the non-shadowed areas. Ideally, 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. 1 shows an exemplary dry-type transformer coil 10 in a plan view of one of the two end faces.
  • 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.
  • a plurality of exemplary sections 18, 20, 22, 24, 26, 28 provide 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.
  • tangentially adjoining 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 to each other in a single layer and tangentially adjacent to each other in the fifth section 26 so that the fifth section 26 has a filling factor approximately twice as high as the fourth section 24.
  • tangentially arranged strip elements are provided for spacing, by the thickness of which the filling factor in the sixth section 28 is ultimately determined.
  • 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, about 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.
  • the flow resistance through the cooling channel 50 is artificially increased, whereby the effective effective filling factor for this area of the hollow cylindrical Space is reduced. 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.
  • the Fig. 3 shows an exemplary transformer core with arranged thereon dry-transformer coils 62, 64, 66 in a plan view 60.
  • the transformer core has three legs, which are connected at its two respective ends with a transverse thereto extending yoke 70.
  • 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 thus formed is compensated according to the invention by an increased fill factor in the corresponding areas of the hollow cylindrical space, so that there is an approximately equal flow resistance 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)

Claims (3)

  1. Transformateur sec (60), comprenant un noyau de transformateur pourvu d'au moins deux culasses de noyau (70) et pourvu d'au moins deux branches de noyau (42), une bobine de transformateur sec (10, 62, 64, 66) autour d'au moins l'une des branches de noyau (42), comprenant
    au moins deux enroulements (12, 14, 46, 48) cylindriques creux, ou parties d'enroulement, imbriqués l'un dans l'autre et espacés dans le sens radial,
    des canaux de refroidissement (30, 32, 34, 36, 50) qui s'étendent dans le sens radial étant disposés dans l'espace intermédiaire (16, 68) cylindrique creux formé par l'espacement, le rapport, appelé facteur de remplissage, entre la surface de section transversale de canal de refroidissement active sur une portion partielle respective de la surface de base de l'espace intermédiaire cylindrique creux et la surface de base de la portion partielle respective sur le pourtour radial de l'espace intermédiaire (16, 68) cylindrique creux étant variable et le facteur de remplissage de l'espace intermédiaire (16, 68) cylindrique creux variant de telle sorte qu'il est plus haut dans les zones (72, 74, 76, 78) masquées du côté frontal par les culasses de noyau (70) que dans les zones non masquées, cette variation étant produite par un rétrécissement, qui a lieu au moins dans certaines zones, d'au moins une zone partielle axiale d'au moins l'un des canaux de refroidissement (30, 32, 34, 36, 50), le rétrécissement respectif de l'un des canaux de refroidissement (30, 32, 34, 36, 50) étant effectué par un élément de rétrécissement (38, 52) disposé dans celui-ci ou devant celui-ci,
    caractérisé en ce qu'au moins un élément de rétrécissement (38, 52) est constitué de plusieurs modules ayant des coefficients de dilatation thermique différents et aussi configuré et disposé de telle sorte que lorsque la température augmente, le rétrécissement de la section transversale du canal de refroidissement (30, 32, 34, 36, 50) correspondant est réduit et, de ce fait, également la résistance à l'écoulement par celui-ci.
  2. Transformateur sec selon la revendication 1, caractérisé en ce que celui-ci possède un moyen de transport pour de l'air de refroidissement.
  3. Transformateur sec (60) selon la revendication 1 ou 2, caractérisé en ce qu'un élément de rétrécissement (38, 52) respectif est fabriqué dans un matériau isolant.
EP13003609.8A 2013-07-17 2013-07-17 Transformateur sec Active EP2827346B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP13003609.8A EP2827346B1 (fr) 2013-07-17 2013-07-17 Transformateur sec
ES13003609.8T ES2616270T3 (es) 2013-07-17 2013-07-17 Transformador seco
PCT/EP2014/061708 WO2015007432A1 (fr) 2013-07-17 2014-06-05 Bobine de transformateur sec et transformateur sec

Applications Claiming Priority (1)

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

Publications (2)

Publication Number Publication Date
EP2827346A1 EP2827346A1 (fr) 2015-01-21
EP2827346B1 true EP2827346B1 (fr) 2016-11-16

Family

ID=48832736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13003609.8A Active EP2827346B1 (fr) 2013-07-17 2013-07-17 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
KR20220061229A (ko) 2019-11-01 2022-05-12 히타치 에너지 스위처랜드 아게 절연 조립체, 변압기 조립체 및 건식 변압기

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2793244A1 (fr) * 2013-04-17 2014-10-22 ABB Technology AG Bobine de transformateur à sec et transformateur à sec

Family Cites Families (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
ITMI20050711A1 (it) * 2005-04-21 2006-10-22 Tmc Italia S P A Trasformatore a secco isolato in resina
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
EP2549495B1 (fr) * 2011-07-18 2018-05-23 ABB Schweiz 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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2793244A1 (fr) * 2013-04-17 2014-10-22 ABB Technology AG Bobine de transformateur à sec et transformateur à sec

Also Published As

Publication number Publication date
WO2015007432A1 (fr) 2015-01-22
EP2827346A1 (fr) 2015-01-21
ES2616270T3 (es) 2017-06-12

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