EP1133779A1 - Transformator - insbesondere giessharztransformator - Google Patents
Transformator - insbesondere giessharztransformatorInfo
- Publication number
- EP1133779A1 EP1133779A1 EP99962087A EP99962087A EP1133779A1 EP 1133779 A1 EP1133779 A1 EP 1133779A1 EP 99962087 A EP99962087 A EP 99962087A EP 99962087 A EP99962087 A EP 99962087A EP 1133779 A1 EP1133779 A1 EP 1133779A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plastic film
- coil
- transformer
- coils
- plastic
- 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.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims abstract description 41
- 239000002985 plastic film Substances 0.000 claims abstract description 33
- 229920006255 plastic film Polymers 0.000 claims abstract description 33
- 238000009413 insulation Methods 0.000 claims abstract description 6
- 239000011347 resin Substances 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 4
- 239000011888 foil Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000700 radioactive tracer Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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
- H01F27/32—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
- H01F27/323—Insulation between winding turns, between winding layers
Definitions
- the invention relates to a transformer, in particular cast resin transformer, with air cooling and with a high-voltage winding made up of a plurality of coils which are electrically connected in series and are arranged one above the other with plastic film as winding insulation.
- Air-cooled transformers have been in widespread use recently because of their excellent active and passive behavior in the event of a fire. This applies especially to transformers whose windings are enclosed in cast resin blocks, which are practically non-flammable due to their high filler content.
- Air cooling results in relatively high temperatures both in the individual turns and in the winding as a whole, because the plastic films and the casting resin have a relatively low thermal conductivity.
- the heat transfer of casting resin and the coolant air is orders of magnitude lower than that of a coolant.
- Another disadvantage is that a relatively large temperature gradient also occurs within the winding itself, the temperature in the upper region of the winding in particular being significantly higher than in the lower region thereof.
- very high-quality and accordingly expensive plastic films must be used for the mutual insulation of the turns in the coils of the winding.
- the invention is therefore based on the object of reducing the outlay for winding insulation, in particular in the high-voltage winding of air-cooled transformers.
- This object is achieved in that the plastic film within the uppermost coil is thermally stronger than the plastic film in the bottom coil, matched to the respective thermal load on the top and bottom coil.
- the thermal strength of the plastic film within the high-voltage winding preferably increases in steps from the lowest to the uppermost coil.
- the plastic films of different thermal strength consist of different materials and have the same dimensions.
- the coils adjacent to the uppermost coil have plastic foils with the same thermal strengths as the uppermost coil and the coils adjacent to the bottom coil have plastic foils with the same thermal strengths as the bottom coil.
- the coils arranged in the central region of the high-voltage winding are preferably each insulated with a plastic film, the thermal strength of which lies between those of the plastic films in the upper and in the lower part of the high-voltage winding.
- coils with plastic film of the same thermal strength are enclosed in a common cast resin block.
- At least one of the plastic films used is preferably two-layered.
- Dry transformers designed according to the invention are very advantageous because they are actually to be taken into ing thermal loads are adaptable, so that an overdimensioning of the thermal strength can be avoided without special manufacturing facilities, such as new molds, being required.
- FIG. 1 shows a dry transformer with a winding cast in cast resin in a perspective view and a cut winding set
- a three-leg iron core carries on each of its core legs 1 a winding set consisting of one undervoltage winding 2 and one high-voltage winding 3.
- the core legs 1 are connected to one another by a lower yoke 4 and an upper yoke 5.
- the core limbs 1, like the yokes 4 and 5, are layered from approx. 0.35 mm thick transformer laminations.
- the core legs 1 are pressed together by bandages 6.
- the bandages 6 simultaneously comprise tension cover plates 7, one of which rests on the front and rear of each of the core legs 1.
- the tension cover plates 7 serve to absorb tensile forces parallel to the leg and are suspended in longitudinal beams 8, two of which press the upper and the lower yoke 5 and 4 together by screw bolts 11 transversely to their layer planes.
- the lower longitudinal members 8 rest on cross members 9 of a chassis with rollers 10.
- the undervoltage windings 2 and high-voltage windings 3 cast in cast resin are supported by blocks 12 with an elastic support on the longitudinal beams 8.
- the elastic core separates the iron core and the windings from each other in terms of vibration.
- the high-voltage windings 3 are electrically connected in a triangle via couplings 13 and are connected to a co-connector via connecting lugs 14. can be connected.
- the high-voltage winding 3 is composed of coils 16, which are wound from coil-wide metal strip 17 (FIG. 2), for example made of aluminum, at least one plastic film 18 being located between the windings lying one on top of the other for electrical insulation.
- the plastic film 18 is as thin as possible for economic reasons, but on the other hand it must ensure reliable winding insulation.
- the transformer is heated up by the losses that occur in it, which are converted into heat. This heat is dissipated to the outside and taken up by the surrounding air.
- the air heated in this way rises and cooler air flows in from below, so that a cooling air flow moves upwards at the transformer.
- the coils 16 lying at the bottom in the high-voltage winding 3 are cooled by cool air and the coils 16 at the top in the high-voltage winding 3 are cooled by air which has already been heated, so that the coils 16 lying at the top reach a higher final temperature for which their thermal strength must be designed .
- the thermal strength of the metal strip 17 is far from being achieved in nominal operation.
- the aforementioned end temperature lies in the range of the thermal strength of the plastic film 18, to which high demands are therefore made, which often only meet special and expensive films.
- the thermal load on the lowermost and uppermost coils is now determined, for example by experiment or calculation, and a plastic film 18 with a for the uppermost and the coils 16 following it downward aligned high thermal strength used.
- the temperature in the high-voltage winding 3 increases linearly from the lowest coil 16 to the uppermost coil 16. Since the same plastic film 18 was previously used in all the coils 16 of a winding, this was oversized in most of the high-voltage winding 3.
- Plastic foils 18 used within one and the same high-voltage winding 3 have the same dimensions regardless of their thermal strength. To avoid confusion of plastic films 18, these are identified by a tracer thread or a tracer tape.
- Plastic film 18 used with the required thermal strength As a result, considerable economic advantages are achieved, in particular in the case of large air-cooled transformers, when the high-voltage winding 3 is divided into three or more cast resin blocks.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Of Coils (AREA)
- Coils Of Transformers For General Uses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19854439 | 1998-11-25 | ||
DE19854439A DE19854439C2 (de) | 1998-11-25 | 1998-11-25 | Transformator - insbesondere Giessharztransformator |
PCT/DE1999/003766 WO2000031761A1 (de) | 1998-11-25 | 1999-11-24 | Transformator - insbesondere giessharztransformator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1133779A1 true EP1133779A1 (de) | 2001-09-19 |
EP1133779B1 EP1133779B1 (de) | 2005-03-16 |
Family
ID=7889022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99962087A Expired - Lifetime EP1133779B1 (de) | 1998-11-25 | 1999-11-24 | Transformator - insbesondere giessharztransformator |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1133779B1 (de) |
DE (2) | DE19854439C2 (de) |
WO (1) | WO2000031761A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10120236C1 (de) * | 2001-04-19 | 2003-01-30 | Siemens Ag | Elektrische Wicklungsanordnung |
DE10148946C2 (de) * | 2001-09-28 | 2003-09-04 | Siemens Ag | Elektrische Wicklungsanordnung |
DE10157591A1 (de) * | 2001-11-23 | 2003-06-05 | Abb T & D Tech Ltd | Wicklung für einen Transformator oder eine Spule |
ITMI20050711A1 (it) * | 2005-04-21 | 2006-10-22 | Tmc Italia S P A | Trasformatore a secco isolato in resina |
DE102005058119B4 (de) * | 2005-11-29 | 2008-01-10 | Siemens Ag | Fixiervorrichtung für eine elektrische Wicklung |
DE102008055882A1 (de) * | 2008-11-03 | 2010-05-06 | Siemens Aktiengesellschaft | Haltevorrichtung für eine Gießharztransformatoren-Wicklung |
CN102903491A (zh) * | 2012-10-29 | 2013-01-30 | 常熟市森源电气科技有限公司 | 小容量环氧树脂浇注干式变压器 |
KR102045895B1 (ko) | 2015-06-18 | 2019-11-18 | 엘에스산전 주식회사 | 변압기의 냉각장치 |
EP3144944A1 (de) | 2015-09-18 | 2017-03-22 | Siemens Aktiengesellschaft | Elektrische wicklung, trockentransformator mit einer solchen elektrischen wicklung und verfahren zur herstellung einer elektrischen wicklung |
DE102016202385A1 (de) | 2016-02-17 | 2017-08-17 | Siemens Aktiengesellschaft | Kompakter Trockentransformator mit einer elektrischen Wicklung und Verfahren zur Herstellung einer elektrischen Wicklung |
DE102016202391A1 (de) | 2016-02-17 | 2017-08-31 | Siemens Aktiengesellschaft | Kompakter Trockentransformator mit einer elektrischen Wicklung und Verfahren zur Herstellung einer elektrischen Wicklung |
DE102023208204A1 (de) | 2023-08-28 | 2025-03-06 | Siemens Energy Global GmbH & Co. KG | Gießharztransformator |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2554904C3 (de) * | 1975-12-06 | 1981-11-19 | Felten & Guilleaume Carlswerk AG, 5000 Köln | Wassergekühltes Hochspannungsenergiekabel |
JPS5915369B2 (ja) * | 1978-12-26 | 1984-04-09 | 鐘淵化学工業株式会社 | 自己支持型コイルの製造方法 |
DE3212060A1 (de) * | 1982-04-01 | 1983-10-06 | Aeg Isolier Kunststoff | Flaechenisolierstoff fuer wicklungen aus aluminiumfolien, insbesondere fuer trockentransformatoren der temperaturklassen f und h |
DE3229480A1 (de) * | 1982-08-06 | 1984-02-09 | Transformatoren Union Ag, 7000 Stuttgart | Trockentransformator mit in giessharz eingegossenen wicklungen |
JPS59151409A (ja) * | 1983-02-18 | 1984-08-29 | Hitachi Ltd | モ−ルドコイル |
CH664041A5 (de) * | 1984-02-08 | 1988-01-29 | Micafil Ag | Verfahren zur lagenweisen wicklung von spulen fuer elektrische geraete. |
DE3539737A1 (de) * | 1985-11-08 | 1987-05-21 | Transformatoren Union Ag | Wicklung fuer transformatoren und drosselspulen |
EP0265612A1 (de) * | 1986-08-29 | 1988-05-04 | Siemens Aktiengesellschaft | Transformator mit Luftkühlung |
SE510451C2 (sv) * | 1997-02-03 | 1999-05-25 | Asea Brown Boveri | Krafttransformator eller reaktor |
-
1998
- 1998-11-25 DE DE19854439A patent/DE19854439C2/de not_active Expired - Fee Related
-
1999
- 1999-11-24 WO PCT/DE1999/003766 patent/WO2000031761A1/de active IP Right Grant
- 1999-11-24 EP EP99962087A patent/EP1133779B1/de not_active Expired - Lifetime
- 1999-11-24 DE DE59911772T patent/DE59911772D1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0031761A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE19854439A1 (de) | 2000-06-15 |
DE19854439C2 (de) | 2000-10-12 |
WO2000031761A1 (de) | 2000-06-02 |
DE59911772D1 (de) | 2005-04-21 |
EP1133779B1 (de) | 2005-03-16 |
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