EP2661756A1 - Enroulement de transformateur doté d'un canal de refroidissement - Google Patents

Enroulement de transformateur doté d'un canal de refroidissement

Info

Publication number
EP2661756A1
EP2661756A1 EP11790876.4A EP11790876A EP2661756A1 EP 2661756 A1 EP2661756 A1 EP 2661756A1 EP 11790876 A EP11790876 A EP 11790876A EP 2661756 A1 EP2661756 A1 EP 2661756A1
Authority
EP
European Patent Office
Prior art keywords
winding
transformer
transformer winding
cooling channel
radially
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Withdrawn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
EP11790876.4A
Other languages
German (de)
English (en)
Inventor
Benjamin Weber
Bhavesh Patel
Burak Esenlik
Frank Cornelius
Marcos Bockholt
Jens Tepper
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 EP11790876.4A priority Critical patent/EP2661756A1/fr
Publication of EP2661756A1 publication Critical patent/EP2661756A1/fr
Withdrawn legal-status Critical Current

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
    • H01F27/2876—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 transformer winding with at least two hollow cylindrical nested around a common winding axis extending winding modules, which are radially spaced from each other within at least one interposed hollow cylindrical cooling channel by means of insulating strips.
  • power transformers for example, with a rated power of a few MVA and in a voltage range of, for example, 5kV to 30kV or 110kV, sometimes even up to 170kV, are also designed as dry-type transformers, wherein in the latter voltage range well rated power of 50MVA and are possible about it.
  • a loss of heat arises in its electrical windings, which is dissipated to the environment. Therefore, for cooling purposes of such a dry transformer usually at least one guided along the axial extent of the winding cooling channel is pronounced to lead out the heat loss preferably by means of natural air cooling from the winding interior.
  • the usually radially inwardly located lower voltage winding is divided into a plurality of radially spaced and electrically connected in series hollow cylindrical winding segments, between which a likewise hollow cylindrical cooling channel is arranged. But also between low and high voltage winding a cooling channel is usually provided.
  • a radial spacing of adjacent winding modules, through which ultimately a cooling channel is formed, takes place here via electrically insulating rectangular profiles or also via so-called "dog-bone" strips.
  • CONFIRMATION COPY would be digs, because, if necessary, still a minimum electrical insulation effect between adjacent winding modules is required, which is achieved by correspondingly thicker insulation strips. As a result, the transformer winding is unnecessarily large and the power density of a transformer is reduced accordingly.
  • This object is achieved by a transformer winding of the aforementioned type.
  • This is characterized in that the insulating strips have a cross-sectional shape which avoids a surface profile radially to the winding axis predominantly.
  • the insulating ability of an insulator is determined on the one hand by its material and on the other hand by its outer surface. Longitudinal surface discharges can occur along these lines, insofar as the voltage stress is correspondingly high, for example a few 100 V / cm and higher. Surface discharges are favored when the electric field lines are tangent to the surface of an insulator, so that the stress stress along the surface is highest.
  • the insulating strips are made of a fiber-reinforced epoxy or polyester resin.
  • this has a high insulating ability.
  • the shape of such an insulating strip could be produced, for example, by milling or by pultrusion methods.
  • thermoplastic materials such as polyamides.
  • polyamides are suitable, which also have a correspondingly high stability at least 130 ° C.
  • the particular advantage of polyamides lies in their particularly simple formability.
  • the at least one cooling channel has a radially inner and a radially outer wall, which are then spaced by the insulating strips.
  • the walls can also be segmented.
  • the insulating strips have a diamond-like or a round cross-section. These are standard geometric shapes which are easy to manufacture and yet which are suitable for improved insulation. From weight and material savings, it may prove advantageous if the insulation strips are designed with an inner cavity. According to further embodiments of the insulating strips, these have an S, X, V, or Y-shaped cross-section. Here radially extending outer surface portions are advantageously largely avoided, so that an improved insulating ability is achieved. In addition, in particular the X, V and Y variants prove to be particularly stable due to their carrier-like structure. Especially with regard to a Torsionsbe braung between the adjacent and spaced winding modules is here to highlight the X and V shape with their slanted support areas as particularly preferred.
  • insulation strips which have a cross-section with sawtooth-like outer edges, are suitable according to the invention to achieve an improved insulating ability.
  • This can mean both an additionally corrugated surface shape of an insulation strip according to the invention and, for example, a rib-like surface or outer surface shape of an insulation strip with a conventional rectangular cross section.
  • the insulating strips have a flattened shape at their radially inner and / or radially outer end, which is ideally designed such that an insulating strip arranged in a cooling channel adjoins the flattened regions as flatly as possible to the regions to be supported.
  • This can be either a winding module itself or a separate wall of a cooling channel.
  • the flattened shape is cylinder-spherical, that is adapted to the cylindrical shape of the adjacent winding modules.
  • cylindrical shape or else “hollow cylindrical” is not to be understood as strictly geometrical with a round base surface, but rather is to be understood as meaning a basic shape approximating a rectangle with round edge regions. Namely, this allows a particularly high utilization of a volume available in a transformer core by transformer windings.
  • the winding modules are galvanically connected to each other.
  • This is a cooling channel with inventive according to spacing between both galvanically isolated upper and lower voltage windings and between winding modules or winding segments of a divided transformer winding possible. This is particularly useful in dry transformers greater power, where in operation correspondingly much waste heat to dissipate from the interior, which is simplified by several cooling channels accordingly.
  • a transformer winding according to the invention also become apparent for a transformer comprising at least one transformer core and a transformer winding according to the invention. This is namely smaller than a conventional transformer winding and thus advantageously allows a smaller construction volume of a transformer according to the invention.
  • FIG. 1 shows a section through an exemplary first transformer winding
  • Fig. 2 is a section through exemplary second transformer winding.
  • a first hollow-cylindrical winding module 12 and a second hollow-cylindrical winding module 14 are arranged concentrically around a winding axis, wherein a likewise hollow-cylindrical cooling channel 18 is formed between them.
  • the two winding modules 12, 14 may, for example, comprise a strip conductor, wherein a winding layer is just as wide as the strip conductor. This is particularly useful in a low-voltage winding, since there is a high conductor cross section is required because of the high current flow in relation to the high-voltage winding during operation of the winding.
  • a conductor layer having a plurality of individual turns which also sets a more complex potential distribution along the cooling channel during operation of the transformer winding.
  • the diameter of such a transformer winding is for example 0.5m to 2.5m, depending on the voltage level and rated power.
  • a plurality of insulating strips 20, 22, 24, 26, 28, 30, 32 are shown by way of example with their cross-sectional shapes, by which the two winding modules 12, 14 are spaced apart in the radial direction 34.
  • the diamond-like insulating strip 20 is just like the round insulating strip 24 provided with an inner cavity 36 and 38, which serves in particular the weight savings.
  • the insulating strips 20, 22, 24, 26, 28, 30, 32 have a cross-sectional shape with a surface course radially 34 to the winding axis 16, which a surface over the radial axis largely avoids the winding axis. As a result, the insulation resistance of the cooling channel 18 is increased in an advantageous manner.
  • insulating strips 20, 22, 24, 26, 28, 30, 32 are provided in a real cooling channel, for example 4 pieces at a respective angle of 90 °.
  • An insulating strip 20, 22, 24, 26, 28, 30, 32 need not necessarily extend over the entire axial length of a transformer winding, for example 1, 5m to 3.5m, it may well be shared several times.
  • FIG. 2 shows a section through an exemplary second transformer winding 40 in a detailed view.
  • a first winding module 42 and a second winding module 44 are spaced by an insulating strip 48, which has approximately the shape of a double-Y. Radially inwardly and radially outwardly provided contact areas 56, 58 to the adjacent winding modules 42, 44 are flattened, wherein they are also adapted to the cylindrical shape of the winding modules. In this way, the risk of electrical discharges in the area of the contact surfaces is largely reduced.
  • the insulating strip 48 has a first inclined surface area 50, a second radially extending surface area 52 and a third inclined surface area 54. An increase in the dielectric strength over a rectangular profile is in the reached obliquely extending areas 50, 54. This can also be illustrated by the extended creepage path 60 along the surface.

Landscapes

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

Abstract

L'invention concerne un enroulement de transformateur (10, 40) comprenant au moins deux modules d'enroulement (12, 14, 42, 44) imbriqués l'un dans l'autre à la façon d'un cylindre creux et s'étendant autour d'un axe d'enroulement commun (16), lesdits modules d'enroulement étant séparés l'un de l'autre radialement (32, 62) au moyen de nervures d'isolation (20, 22, 24, 26, 28, 30, 32, 48) à l'intérieur d'au moins un canal de refroidissement (18, 46) cylindrique creux agencé entre eux. Les nervures d'isolation (20, 22, 24, 26, 28, 30, 32, 48) présentent une forme de section transversale qui évite principalement un tracé de surface (50, 52, 54) radialement (32, 62) par rapport à l'axe d'enroulement (16).
EP11790876.4A 2011-01-04 2011-11-29 Enroulement de transformateur doté d'un canal de refroidissement Withdrawn EP2661756A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11790876.4A EP2661756A1 (fr) 2011-01-04 2011-11-29 Enroulement de transformateur doté d'un canal de refroidissement

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11000018A EP2472533A1 (fr) 2011-01-04 2011-01-04 Enroulement de transformateur doté d'un canal de refroidissement
PCT/EP2011/005969 WO2012092941A1 (fr) 2011-01-04 2011-11-29 Enroulement de transformateur doté d'un canal de refroidissement
EP11790876.4A EP2661756A1 (fr) 2011-01-04 2011-11-29 Enroulement de transformateur doté d'un canal de refroidissement

Publications (1)

Publication Number Publication Date
EP2661756A1 true EP2661756A1 (fr) 2013-11-13

Family

ID=44070112

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11000018A Withdrawn EP2472533A1 (fr) 2011-01-04 2011-01-04 Enroulement de transformateur doté d'un canal de refroidissement
EP11790876.4A Withdrawn EP2661756A1 (fr) 2011-01-04 2011-11-29 Enroulement de transformateur doté d'un canal de refroidissement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP11000018A Withdrawn EP2472533A1 (fr) 2011-01-04 2011-01-04 Enroulement de transformateur doté d'un canal de refroidissement

Country Status (4)

Country Link
US (1) US9208939B2 (fr)
EP (2) EP2472533A1 (fr)
CN (1) CN103270560B (fr)
WO (1) WO2012092941A1 (fr)

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Publication number Priority date Publication date Assignee Title
ES2616270T3 (es) * 2013-07-17 2017-06-12 Abb Schweiz Ag Transformador seco
KR101981594B1 (ko) * 2013-08-16 2019-05-24 현대일렉트릭앤에너지시스템(주) 냉각 가이드용 스페이서 및 이를 이용한 공심 리액터
PL2866235T3 (pl) * 2013-10-22 2020-04-30 Abb Schweiz Ag Transformator wysokiego napięcia
CN103971893A (zh) * 2014-05-19 2014-08-06 苏州上电科电气设备有限公司 一种变压器铁芯
WO2016073576A1 (fr) * 2014-11-04 2016-05-12 SAHIN, Hakan Systèmes et procédés relatifs à un transformateur électrique
US11355279B2 (en) 2018-06-07 2022-06-07 Siemens Energy Global GmbH & Co. KG Core sealing assemblies, core-coil assemblies, and sealing methods
KR102275643B1 (ko) * 2020-03-02 2021-07-09 주식회사 코아전기 유도코일을 포함하는 변압기

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US2710947A (en) * 1951-11-28 1955-06-14 Electrocraft Company Electrical coil construction
US2904760A (en) * 1955-12-30 1959-09-15 Allis Chalmers Mfg Co Glass spacing sticks for dry type transformer
FR1278093A (fr) * 1960-10-26 1961-12-08 Perfectionnements apportés aux circuits magnétiques et aux éléments qu'ils équipent, ainsi qu'aux procédés et dispositifs de fabrication de ces circuits et éléments
US3195084A (en) * 1962-05-23 1965-07-13 Westinghouse Electric Corp Electrical apparatus having foil wound windings and metallic duct formers
US3302149A (en) * 1964-09-30 1967-01-31 Westinghouse Electric Corp Electrical insulating structure
US3237136A (en) * 1964-11-19 1966-02-22 Westinghouse Electric Corp Coils for inductive apparatus
US3447112A (en) * 1967-11-16 1969-05-27 Westinghouse Electric Corp Air cooled transformer
US3748616A (en) * 1972-03-24 1973-07-24 Ite Imperial Corp Transformer winding structure using corrugated spacers
DE2724920C2 (de) * 1977-06-02 1982-08-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Hochspannungsfeste Signalübertragungseinrichtung mit einem Trennübertrager
US4447796A (en) * 1982-04-05 1984-05-08 Mcgraw-Edison Company Self-adjusting spacer
DE3428613A1 (de) * 1984-08-02 1986-02-13 Transformatoren Union Ag, 7000 Stuttgart Lagenwicklung fuer transformatoren
US4663604A (en) * 1986-01-14 1987-05-05 General Electric Company Coil assembly and support system for a transformer and a transformer employing same
US5396210A (en) * 1993-03-17 1995-03-07 Square D Company Dry-type transformer and method of manufacturing
US7023312B1 (en) * 2001-12-21 2006-04-04 Abb Technology Ag Integrated cooling duct for resin-encapsulated distribution transformer coils
US7140420B2 (en) * 2003-11-05 2006-11-28 General Electric Company Thermal management apparatus and uses thereof
US7788794B2 (en) * 2006-05-30 2010-09-07 Abb Technology Ag Disc-wound transformer with foil conductor and method of manufacturing the same
US7719397B2 (en) * 2006-07-27 2010-05-18 Abb Technology Ag Disc wound transformer with improved cooling and impulse voltage distribution
EP2074639A1 (fr) * 2006-10-19 2009-07-01 Abb Research Ltd. Bobine basse tension et transformateur

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Title
See references of WO2012092941A1 *

Also Published As

Publication number Publication date
US9208939B2 (en) 2015-12-08
WO2012092941A1 (fr) 2012-07-12
CN103270560A (zh) 2013-08-28
CN103270560B (zh) 2016-04-20
US20130293329A1 (en) 2013-11-07
EP2472533A1 (fr) 2012-07-04

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