EP2661759A1 - Enroulement de transformateur - Google Patents

Enroulement de transformateur

Info

Publication number
EP2661759A1
EP2661759A1 EP11796621.8A EP11796621A EP2661759A1 EP 2661759 A1 EP2661759 A1 EP 2661759A1 EP 11796621 A EP11796621 A EP 11796621A EP 2661759 A1 EP2661759 A1 EP 2661759A1
Authority
EP
European Patent Office
Prior art keywords
winding
transformer
transformer winding
modules
layer
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Withdrawn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
EP11796621.8A
Other languages
German (de)
English (en)
Inventor
Benjamin Weber
Bhavesh Patel
Burak Esenlik
Frank Cornelius
Marcos Bockholt
Jens Tepper
Karl-Heinz Zillmann
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 EP11796621.8A priority Critical patent/EP2661759A1/fr
Publication of EP2661759A1 publication Critical patent/EP2661759A1/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Withdrawn legal-status Critical Current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
    • H01F27/2895—Windings disposed upon ring cores
    • 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
    • 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
    • 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 transformer winding comprising at least two hollow cylindrical axially adjacent winding modules arranged around a common winding axis with a layer-wound electrical conductor and a common electrical insulation layer, by which the winding modules are enveloped.
  • 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.
  • the navalssei- term windings are usually isolated by a mixture of glass roving and epoxy resin, the insulation layer formed therefrom usually encloses the winding.
  • CONFIRMATION COPY occurs, which leads to an increased stress on the interposed insulating layer.
  • a corresponding voltage stress also occurs when galvanically isolated windings are arranged axially adjacent.
  • the insulating material as such is readily dimensioned such that it can withstand this stress in its interior.
  • a hollow cylindrical winding is according to the invention not only a winding with a circular cross-section to understand, but this term also includes an approximately rectangular cross-section with rounded corners. In this way, the winding window available is optimally utilized when the winding is installed on a transformer core having a rectangular cross section.
  • the disadvantage is that along the outer surface of the insulating layer of the winding and in particular over the region of the axially adjacent winding segments also builds up a potential difference. This can lead along the outer surface of the common insulation layer of the winding to unwanted discharges or partial breakdowns, which is still favored by a possible contamination of the outer surface.
  • a transformer winding of the aforementioned type This is characterized in that the insulating layer has at least one transverse to the winding axis pronounced annular radial recess or elevation on its radial outer surface.
  • Such an annular radial depression or elevation advantageously extends the creepage path along the axial extent of the surface, wherein the voltage stress also takes place along the axial surface due to the axially adjacent arrangement of the winding modules.
  • an increase in the voltage carrying capacity is achieved. is sufficient, with an increase in size - at least in the case of wells - avoided in an advantageous manner.
  • the configuration of a depression or an elevation may, for example, have a rectangular, semicircular, parabolic, umbrella-like or else Gaussian curve-like cross section. What is essential is ultimately an extension of the creepage path along the surface and the avoidance of the formation of a continuous moisture film on the surface.
  • the transformer winding according to the invention encloses the at least one annular radial recess or survey the transformer winding completely, ie at an angle of 360 ° about the winding axis.
  • an extension of the axial creepage path takes place uniformly over the entire circumference of the winding.
  • this makes the production of the insulating layer, which is usually also wound, simplified accordingly. But also, for example, a subsequent milling a ring-like radial recess in an existing insulating layer is simplified.
  • At least one annular radial depression is arranged between the at least two axially adjacent winding modules.
  • an extension of the creepage path particularly advantageous effect on the insulation capacity of the winding.
  • such a depression can be made deeper there than directly above a winding module, because the depression can protrude into the intermediate space between the axially adjacent winding modules. In this way, the creepage distance is extended in the isolationistically critical area in a particularly effective manner.
  • a recess arranged in this way can be realized particularly effectively according to the invention if a radially outer winding layer of a winding module is shortened axially with respect to winding layers located radially below it. Then, the space available between the axially adjacent winding modules is increased in the radially outer area, where half there is also provided an enlarged space for the arrangement of a radial annular recess. The insulation resistance is thus advantageously increased with a corresponding design of the depression.
  • the transformer winding can be produced particularly simply if it is arranged on a coil former.
  • it turns out when the winding is limited at its two axial end faces of one end plate.
  • a kind of laterally limited bobbin is formed, which is particularly suitable for a winding process, wherein preferably both the electrical conductor and the insulating layer are wound in a common manufacturing process.
  • this has at least two winding modules, which are electrically connected to each other radially inside.
  • the winding comprises at least two groups of two radially inwardly electrically connected winding modules, which are not necessarily galvanically connected to one another.
  • the common electrical insulation layer has a wound insulating material, for example a fiber roving.
  • a wound insulating material for example a fiber roving.
  • This can be wound production technology together with the electrical conductor, wherein the fiber roving is soaked, for example, with a moist epoxy resin.
  • the winding is then to cure the resin to a polymerization temperature, depending on the used resin, for example, 160 ° C, to heat, so that the resin then cures completely.
  • a dry or at least tacky, tape-like insulating material proves to be particularly advantageous for winding recesses or elevations according to the invention, because this is significantly more dimensionally stable during the winding process.
  • the winding of a survey with rectangular cross-section is particularly easy by a corresponding number of winding layers of a dry insulation tape are wrapped one above the other.
  • the wound insulating material is a fiber roving or glass fiber roving pre-impregnated with resin in the B state, which has been heated to a polymerization temperature after the winding process.
  • B-state of a resin means that the curing process of the resin has already started but has been discontinued intentionally so that the resin is in a state of incomplete polymerization.
  • the B-state of a resin can also mean that this has been converted into a solid state by appropriate heating to a melting temperature of, for example, 80 ° C. and subsequent cooling, without the actual chemical reaction of the polymerization having already been initiated. In such a state, the resin can be remelted at a corresponding temperature, wherein the actual polymerization takes place at a temperature above the melting temperature, for example at a baking temperature in the range of 120 ° C to 140 ° C.
  • the common electrical insulation layer has a part by means the insulation material wrapped transversely to the winding axis arranged flexible profile strip, through which at least a portion of the radial annular depressions or elevations is formed.
  • the profiled strip is made of an insulating material and protrudes preferably with a first part of the radial outer surface of the insulating layer and is arranged with a second in the insulating layer and thereby fixed that preferably parallel to the winding axis extending profile areas are fixed with wound insulation material.
  • the profile strip is to be regarded as part of the insulating layer itself, by which the creepage path is extended in an advantageous manner.
  • the flexible profile strip has a T-shaped profile cross-section. This is particularly suitable to be anchored in the insulation layer. But there are also other profile shapes such as a multiple T cross-section, for example, a TTT cross-section, conceivable, which would then, if necessary, also be placed so deep in the insulation that it does not protrude but is formed by a depression.
  • the flexible profile strip consists at least predominantly of a silicone rubber. Because of the high material flexibility, this can be particularly easily adapted to the outer contour shape of a winding according to the invention, but of course also pre-bent and possibly less flexible profile strip pieces can be used.
  • FIG. 1 shows a section through part of a first exemplary transformer winding
  • Fig. 2 is a section through the second exemplary transformer winding
  • FIG 3 shows a section through part of a third exemplary transformer winding.
  • FIG. 1 shows a section through part of a first exemplary transformer winding 10, which is arranged rotationally symmetrically about a winding axis 16.
  • the winding is arranged on a bobbin 36, which is bounded at its axial ends by two end plates 38, 40.
  • Two axially adjacent hollow-cylindrical winding modules 12, 14 are provided which each comprise a plurality of winding layers of a single conductor 18, 20.
  • a winding layer is illustrated drawing technology as a horizontal line, which, however, symbolizes a plurality of axially adjacent turns of a conductor 18, 20, which in turn is arranged around the winding axis 16.
  • the two winding modules 12, 14 are electrically connected in series with one another by means of a galvanic connection 34.
  • both winding modules 12, 14 are surrounded by a common insulation layer 22, in this case a wound insulating material preimpregnated with an epoxy resin in the B state, which was finally heated to a polymerization temperature.
  • the insulating layer 22 not only surrounds the outer surfaces of the winding, but it is also provided between them also between the individual winding layers and thus ensures the electrical insulation between the wound conductor layers.
  • winding 42 which is intended to symbolize a winding on the underside
  • radially outer winding according to the invention is intended to symbolize a winding on the high side with a rated voltage of, for example, 60 kV.
  • an elongation of the creepage path according to the invention is not essential because of the lower stress load associated with a lower rated voltage of, for example, 6 kV.
  • FIG. 2 shows a complete section through a second exemplary transformer winding 50, that is to say with a partial section above the winding axis 50 and with a partial section below the winding axis 56.
  • a second exemplary transformer winding 50 Arranged around the winding axis 56 are two hollow cylindrical and axially adjacent winding modules 52, 54, each with five winding layers are indicated.
  • the galvanic connections of the layers to each other and the galvanic connection between the winding modules 52, 54 are shown, while only the winding layers are shown in the lower section.
  • the two winding modules are surrounded by a common insulation layer 68.
  • radial outer surface of the insulation layer 68 Arranged on the radial outer surface of the insulation layer 68 are five ring-shaped radial depressions 58, 60, 62, 64, 66, which serve to extend the creeping path. Depending on the structural boundary conditions, depressions prove to be more advantageous over surveys, because they have no additional space requirement and also allow material savings.
  • the respective radially outer two winding layers are axially reset in the axial center of the winding 50, so that the annular radial recess 58 could be correspondingly deeper and larger than the other wells 60, 62, 64, 66. This proves to be particularly advantageous because in the axial gap between the two winding modules along the outer surface of the insulating layer is operatively expected to be the highest voltage stress.
  • FIG. 3 shows a section through a portion of a third exemplary transformer winding 70 disposed about a winding axis 80.
  • the winding corresponds essentially to the winding 10 shown in FIG. 1, wherein, in contrast to this, however, four axially adjacent winding modules 72, 74, 76, 78 are provided which in each case comprise two galvanically interconnected sub-groups of the winding modules 72 and 74 and 76 and 78 are divided, the groups are in turn galvanically separated from each other.
  • the winding modules 72, 74, 76, 78 are surrounded by a common insulation layer 82 or enclosed therein.
  • the highest stress loads along the radially outer surface 90 occur in the axial direction between adjacent winding modules 72, 74, 76, 78. These are also exactly the areas where the creepage distance has been lengthened in the axial direction by corresponding radial ring-like depressions 84, 86, 88, so that a correspondingly increased dielectric strength results.
  • Another Kriechwegverinrung in the region of the adjoining sub-groups 72, 74 and 76, 78 is realized by protruding from the insulating material flexible profile strips 90, 92, 94, wherein the arranged in the recess 86 profile strip protrudes only from the bottom of the recess, but not from the winding surface.
  • the profile strips are made of an electrically insulating material such as a silicone rubber.
  • the T-shaped profile strips are fixed by a plurality of the transverse T-bar enclosing layers of a wound insulation material.

Landscapes

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

Abstract

L'invention concerne un enroulement de transformateur (10, 50, 70) comprenant : au moins deux modules d'enroulement (12, 14, 52, 54, 72, 74, 76, 78) adjacents axialement, agencés à la façon d'un cylindre creux autour d'un axe d'enroulement commun (16, 56, 80), comprenant un conducteur électrique (18, 20) enroulé en couches; ainsi qu'au moins une couche d'isolation électrique (22, 68, 82) qui enrobe les modules d'enroulement (12, 14, 52, 54, 72, 74, 76, 78). La couche d'isolation (22, 68, 82) présente, sur sa face extérieure radiale (24, 90) au moins une partie en creux radiale annulaire (28, 30, 58, 60, 62, 64, 66, 84, 86, 88) ou une partie saillante radiale annulaire (32) s'étendant transversalement à l'axe d'enroulement (16, 56, 80).
EP11796621.8A 2011-01-05 2011-11-29 Enroulement de transformateur Withdrawn EP2661759A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11796621.8A EP2661759A1 (fr) 2011-01-05 2011-11-29 Enroulement de transformateur

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11000040A EP2474986A1 (fr) 2011-01-05 2011-01-05 Enroulement de transformateur
EP11796621.8A EP2661759A1 (fr) 2011-01-05 2011-11-29 Enroulement de transformateur
PCT/EP2011/005970 WO2012092942A1 (fr) 2011-01-05 2011-11-29 Enroulement de transformateur

Publications (1)

Publication Number Publication Date
EP2661759A1 true EP2661759A1 (fr) 2013-11-13

Family

ID=44148772

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11000040A Withdrawn EP2474986A1 (fr) 2011-01-05 2011-01-05 Enroulement de transformateur
EP11796621.8A Withdrawn EP2661759A1 (fr) 2011-01-05 2011-11-29 Enroulement de transformateur

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP11000040A Withdrawn EP2474986A1 (fr) 2011-01-05 2011-01-05 Enroulement de transformateur

Country Status (6)

Country Link
US (1) US8692643B2 (fr)
EP (2) EP2474986A1 (fr)
CN (1) CN103282982B (fr)
BR (1) BR112013015731A2 (fr)
CA (1) CA2823793C (fr)
WO (1) WO2012092942A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6352791B2 (ja) * 2014-12-11 2018-07-04 Ckd株式会社 コイル用シート、コイル、及びコイルの製造方法
EP3521786B8 (fr) * 2018-01-31 2020-11-18 ABB Power Grids Switzerland AG Composant électrique enroulé avec capteur de circuits électroniques imprimés
US11605496B2 (en) 2018-04-09 2023-03-14 Abb Schweiz Ag Foil wound magnetic assemblies with thermally conductive tape and methods of assembling same
CN109596926B (zh) * 2018-12-30 2020-10-27 国网北京市电力公司 变压器试验温度的修正方法及装置
EP3812708B1 (fr) * 2019-10-21 2022-08-31 Hamilton Sundstrand Corporation Transducteur différentiel linéaire variable

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE287894C (fr) *
US1840139A (en) * 1929-02-26 1932-01-05 Gen Electric Electrical coil
CH294051A (de) * 1951-10-05 1953-10-31 Oerlikon Maschf Stossfester Hochspannungstransformator, insbesondere Messwandler.
CH350711A (de) * 1957-04-02 1960-12-15 Oerlikon Maschf Oberspannungswicklung für Transformatoren, insbesondere für Spannungswandler
CH367562A (de) * 1959-05-20 1963-02-28 Oerlikon Maschf Verfahren zur Herstellung eines kunstharzisolierten Transformators, insbesondere eines Wandlers
DE4340020A1 (de) * 1993-11-24 1995-06-01 Sachsenwerk Ag Induktiver elektrischer Wandler
DE102006060567A1 (de) * 2006-12-19 2008-06-26 Abb Ag Verfahren zur Herstellung einer Transformatorspule und eine nach diesem Verfahren hergestellten Transformatorspule
DE102007053685A1 (de) * 2007-11-10 2009-05-14 Abb Technology Ag Herstellungsverfahren für eine mehrlagige Transformatorwicklung mit Isolationsschicht
CN201285690Y (zh) * 2008-10-08 2009-08-05 丁晓东 一种高电压试验用环氧树脂浇注电抗器

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2012092942A1 *

Also Published As

Publication number Publication date
CN103282982B (zh) 2016-03-30
CA2823793A1 (fr) 2012-07-12
BR112013015731A2 (pt) 2018-10-30
WO2012092942A1 (fr) 2012-07-12
CN103282982A (zh) 2013-09-04
CA2823793C (fr) 2017-02-07
EP2474986A1 (fr) 2012-07-11
US8692643B2 (en) 2014-04-08
US20130293340A1 (en) 2013-11-07

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