EP2439755A1 - Elektrischer Trockentransformator - Google Patents

Elektrischer Trockentransformator Download PDF

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Publication number
EP2439755A1
EP2439755A1 EP10187072A EP10187072A EP2439755A1 EP 2439755 A1 EP2439755 A1 EP 2439755A1 EP 10187072 A EP10187072 A EP 10187072A EP 10187072 A EP10187072 A EP 10187072A EP 2439755 A1 EP2439755 A1 EP 2439755A1
Authority
EP
European Patent Office
Prior art keywords
dry
type electrical
electrical transformer
electrically insulating
transformer according
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Withdrawn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
EP10187072A
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English (en)
French (fr)
Inventor
Rafael Murillo
Carlos Roy
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 Technology 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 EP10187072A priority Critical patent/EP2439755A1/de
Publication of EP2439755A1 publication Critical patent/EP2439755A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures

Definitions

  • the present invention relates to a dry-type electrical transformer having improved performances and an optimised structure.
  • the basic task of an electrical dry-type transformer is to allow exchanging electric energy between two or more electrical systems of usually different voltages.
  • Most common dry-type transformers generally comprise a magnetic core composed by one or more legs or limbs connected by yokes which together form one or more core windows; for each phase, around the legs there are arranged a number of windings, i.e. low-voltage windings, high-voltage windings,.
  • phase windings are usually realized by winding around the corresponding leg of the core suitable conductors, for example wires, or cables, or strips, so as to achieve the desired number of turns. Cooling of live parts is performed by means of air.
  • a larger distance between the LV and HV windings increases the impedance of the transformer and therefore negatively influences the desired electromagnetic performances of the transformers, thus entailing for example an increase of the magnetic core size in order to face such a negative effect.
  • the aim of the present invention is to provide a dry-type electrical transformer whose constructive structure is optimized with respect to equivalent types of known induction devices, in particular as regard to the distance and constructive layout between the windings of each phase.
  • the dry-type electrical transformer according to the present invention will be hereinafter described by making reference to only one electrical phase; clearly, such description and features of the invention are applicable likewise to any phase of a dry-type transformer independently from the number of phases.
  • the dry-type electrical transformer according to the invention comprises a magnetic core 200 which is operatively coupled to a supporting structure.
  • the magnetic core 200 comprises one leg 201 for each phase, namely three, with the legs 201 mutually connected by yokes according to constructive configurations which are well known in the art and therefore will not be described herein in details.
  • the supporting structure may for example comprise a couple of clamps 101 which are positioned on the opposite sides of the core and may be connected by one or more vertical connecting elements, for example tie-rods; clearly, also the supporting structure may have different shape or comprise additional or alternative components according to various solutions which are readily available to those skilled in the art.
  • each leg 201 there is arranged, for each phase, at least one inner winding 10 which has a first rated voltage, and at least one outer winding 20 which is arranged around the inner winding 10 and has a second rated voltage, preferably higher than said first rated voltage; for example, the rated voltage of the inner winding 10 can be 0.4 kV, while the rated voltage of the outer winding 20 can be 20 kV.
  • the outer winding 20 is normally indicated as the high-voltage-winding, whilst the inner winding 10 is usually indicated as the low-voltage winding, and these definitions will be used in the following description.
  • the inner and outer windings 10, 20 are placed coaxially around the corresponding portion of the magnetic core 200, i.e. the leg 201, and are spaced apart from each so as a desired total air-gap (A), that is a distance measured perpendicularly with respect to a vertical axis 202 of the leg 1, is formed there between.
  • A total air-gap
  • One or more supporting blocks 103 for the inner winding 10 and outer winding 20 are positioned above and below the windings 10, 20 themselves.
  • the transformer 100 comprises a plurality of electrically insulating barriers 2, 3, 4,...n which are positioned between the LV winding 10 and the HV winding 20 and are spaced apart from each other and from the inner and outer windings 10, 20 so as the total air-gap (A) or distance between such windings 10, 20 is divided into a plurality of sub-air-gaps A 1 , A 2 , A n as better illustrated in figure 6 and 7 .
  • each electrically insulating barrier 2, 3, 4,...n has a height (H 1 ), which is higher than the height (H 2 ) of the coaxial LV and HV windings 10, 20 as schematically illustrated in figures 6 and 7 ; such heights (H 1 ) and (H 2 ) are meant to be measured along the vertical extension of the leg 201, i.e. substantially parallel to its vertical axis 202.
  • the plurality of electrically insulating barriers comprises at least three barriers 2, 3, 4, as illustrated in the embodiment of figures 2-7 ; clearly, based on the applications, it is possible to increase the numbers of barriers.
  • the electrically insulating barriers 2, 3, 4 are arranged coaxially to each other and to the LV and HV windings 10, 20, with respect to the respective leg 201, and in particular to its reference vertical axis 202.
  • the electrically insulating barriers 2, 3, 4 are arranged spirally between the inner and outer windings 10, 20 with respect to the respective leg 201, and in particular to its reference vertical axis 202.
  • barriers are positioned relative to each other so as that the sub-air gaps or distance (A 1 , A 2 , A n ) formed between two adjacent electrically insulating barriers, e.g. barriers 2-3, and barriers 3-4 of the embodiments illustrated, are substantially equal to each other.
  • the electrically insulating barriers (2, 3, 4, n) are positioned relative to each other and between the inner and outer windings 10, 20 so as the total air-gap or distance (A) between the LV winding 10 and the HV winding 20 is divided into a plurality of substantially equal sub-air-gaps (A 1 , A 2 , A n ).
  • each sub air gap is about 10 mm, in any case preferably not greater than 15 mm.
  • each air gap is measured taking as reference the centre line of the thickness of each barrier 2, 3,4; thus for example, in the embodiment of figure 2 , the air gap A 1 is the distance between the outer surface of the LV winding 10 and the centre line of the inner barrier 2; the air gap A 2 is the distance between the respective centre lines of the inner barrier 2 and the adjacent barrier 3; the air gap A n is the distance between the inner surface of the HV winding 20 and the centre line of the outer barrier 4.
  • each insulating barrier and the adjacent one there is provided a corresponding set (5, 6,...n) of spacers which are interposed between and connected to the respective faces of the adjacent barriers; for example in the embodiment illustrated in figures 2-7 , between the inner barrier 2 and the intermediate barrier 3 there is a first set of spacers 5, and between the intermediate barrier 3 and the outer barrier 4, there is a second set of barriers 6.
  • a radial direction indicated in figure 4 by the reference 203 e.g.
  • the spacers of a set of spacers are offset with the spacers of the adjacent set of spacers, e.g. the spacers.
  • each spacer 5 of a set of spacers 5 is radially aligned with a corresponding spacer 6 of the adjacent set of spacers 6.
  • Such spacers 5, 6,...n are formed by electrically insulating materials, such as for example plastics or composite materials, for instance fibreglass and epoxy resin, and may have the form of solid sticks or ribs as illustrated in the figures.
  • spacers are formed by sticks or ribs they have a height (H 3 ), which is shorter than the height (H 2 ) of the coaxial LV and HV windings 10, 20 as schematically illustrated in figures 6 and 7 ; as indicated before, also the height (H 3 ) is meant to be measured along the vertical extension of the leg 201, i.e. substantially parallel to its vertical axis 202.
  • spacers 41 e.g. in the form or small blocks (or even clips or rivets) schematically indicated in figure 6 by the reference number 41, at one or both ends of the insulating barriers (2,3,4,...n), where the electric field is small. These spacers 41 connect to each other adjacent barriers 2,3,4...n.
  • the electrically insulating barriers 2, 3, 4,...n can be operatively connected to directly and supported by the blocks 103 supporting the LV and HV windings 10, 20, either by top and bottom blocks, or just by the bottom blocks 103; for example the barriers can be entered into suitable slots of the top and/or bottom blocks 103 or just rest on those placed at the bottom part, or either ways, namely entered into slots of the top blocks 103 and resting on the bottom blocks 103, or any other possible alternative.
  • some elements for instance spacers in the form of small blocks may be used and can be operatively connected to the barriers 2,3,4,...n and to the supporting blocks 103; also in this case is possible to use such small blocks only at one edge of the barriers, e.g. the bottom one, or at both edges.
  • These small blocks can be mechanically attached to the support blocks 103, either preferably only to the bottom blocks 103 and/or the top blocks 103, or they can be attached to the top supporting blocks 103 and can rest on the bottom supporting blocks 103.
  • some further fixing elements such as clips which can be connected to the barriers for example in a plug-in or clip-clap fashion, or even rivets can be used.
  • these clips or rivets can just rest on the supporting blocks, e.g. the bottom ones, or can be operatively connected, e.g. mechanically, to the bottom supporting blocks 103 and/or the top supporting blocks 103.
  • set of spacers (5, 6,...n) between adjacent barriers may or may not be used.
  • the electrically insulating barriers 2, 3, 4...n are operatively connected to and supported by the inner winding 10.
  • the transformer 100 preferably comprises an additional set of supporting spacers 40 which are interposed between and operatively connected to the inner winding 10 and the inner electrically insulating barrier 2 of the plurality of electrically insulating barriers 2, 3, 4,...n.
  • these spacers 40 have a height, e.g. the same height (H 3 ) of the spacers 5, 6, which is lower than the height (H 2 ) of the coaxial LV and HV windings 10, 20; further such spacers 40 can be preferably positioned offset with the spacers of the adjacent set of spacers, i.e. the spacers 5, with reference to the radial direction 203.
  • each spacer 40 of the set of supporting spacers may be radially aligned with a corresponding spacer 5 of the adjacent set of spacers 5.
  • the dry-type electrical transformer according to the invention fully achieves the intended aim giving some significant advantages and improvements with respect to known transformers of the same type.
  • the use of insulating barriers between the phase windings divides the total air gap into a certain number of smaller sub air gaps; with respect to known transformers, these smaller sub air gaps can withstand higher electric fields compared to known transformers, leading to a significant reduction of the total air gap, and so saving material cost and no-load losses.
  • the total air gap is reduced to about 65-70% compared to the prior art solutions of the same type and level of rated voltage.
  • dry-type electrical transformer thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept as defined in the claims; for example, the features described for only some of the embodiments illustrated can be used in any of the embodiments herein disclosed; the shape and/or material and/or number of the spacers and/or barriers may be changed according to the applications provided they are compatible with the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
EP10187072A 2010-10-08 2010-10-08 Elektrischer Trockentransformator Withdrawn EP2439755A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10187072A EP2439755A1 (de) 2010-10-08 2010-10-08 Elektrischer Trockentransformator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10187072A EP2439755A1 (de) 2010-10-08 2010-10-08 Elektrischer Trockentransformator

Publications (1)

Publication Number Publication Date
EP2439755A1 true EP2439755A1 (de) 2012-04-11

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Family Applications (1)

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EP10187072A Withdrawn EP2439755A1 (de) 2010-10-08 2010-10-08 Elektrischer Trockentransformator

Country Status (1)

Country Link
EP (1) EP2439755A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102903488A (zh) * 2012-10-29 2013-01-30 常熟市森源电气科技有限公司 空调冷水中压机组用干式铁心启动电抗器
CN103219136A (zh) * 2013-04-26 2013-07-24 江苏上能新特变压器有限公司 移相整流干式变压器
EP2793244A1 (de) * 2013-04-17 2014-10-22 ABB Technology AG Trockentransformatorspule und Trockentransformator
EP2827346A1 (de) * 2013-07-17 2015-01-21 ABB Technology AG Trockentransformatorspule und Trockentransformator
EP3116000A1 (de) * 2015-06-18 2017-01-11 LSIS Co., Ltd. Kühlvorrichtung eines leistungswandlers
US11355278B2 (en) * 2017-05-31 2022-06-07 Hitachi Energy Switzerland Ag Insulating transformers

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US271050A (en) * 1883-01-23 Darius i
DE1098601B (de) * 1958-07-23 1961-02-02 Licentia Gmbh Isolationsaufbau fuer Transformator- oder Drosselspul-Wicklungen
CS271050B1 (en) * 1989-01-31 1991-07-11 Frank Jaroslav Electrically and thermally insulation system of dry transformers' windings with higher outputs
JPH07211553A (ja) * 1994-01-17 1995-08-11 Toshiba Corp ガス絶縁変圧器
JPH11154615A (ja) * 1997-11-20 1999-06-08 Hitachi Ltd ガス絶縁変圧器
JP2002033219A (ja) * 2000-07-17 2002-01-31 Hitachi Ltd ガス絶縁変圧器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US271050A (en) * 1883-01-23 Darius i
DE1098601B (de) * 1958-07-23 1961-02-02 Licentia Gmbh Isolationsaufbau fuer Transformator- oder Drosselspul-Wicklungen
CS271050B1 (en) * 1989-01-31 1991-07-11 Frank Jaroslav Electrically and thermally insulation system of dry transformers' windings with higher outputs
JPH07211553A (ja) * 1994-01-17 1995-08-11 Toshiba Corp ガス絶縁変圧器
JPH11154615A (ja) * 1997-11-20 1999-06-08 Hitachi Ltd ガス絶縁変圧器
JP2002033219A (ja) * 2000-07-17 2002-01-31 Hitachi Ltd ガス絶縁変圧器

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102903488A (zh) * 2012-10-29 2013-01-30 常熟市森源电气科技有限公司 空调冷水中压机组用干式铁心启动电抗器
EP2793244A1 (de) * 2013-04-17 2014-10-22 ABB Technology AG Trockentransformatorspule und Trockentransformator
WO2014169997A1 (de) * 2013-04-17 2014-10-23 Abb Technology Ag Trockentransformatorspule und trockentransformator
CN103219136A (zh) * 2013-04-26 2013-07-24 江苏上能新特变压器有限公司 移相整流干式变压器
CN103219136B (zh) * 2013-04-26 2016-03-09 江苏上能新特变压器有限公司 移相整流干式变压器
EP2827346A1 (de) * 2013-07-17 2015-01-21 ABB Technology AG Trockentransformatorspule und Trockentransformator
WO2015007432A1 (de) * 2013-07-17 2015-01-22 Abb Technology Ag Trockentransformatorspule und trockentransformator
EP3116000A1 (de) * 2015-06-18 2017-01-11 LSIS Co., Ltd. Kühlvorrichtung eines leistungswandlers
US9818525B2 (en) 2015-06-18 2017-11-14 Lsis Co., Ltd. Cooling device of power transformer
US11355278B2 (en) * 2017-05-31 2022-06-07 Hitachi Energy Switzerland Ag Insulating transformers

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