EP2274754A1 - Trockentransformator - Google Patents
TrockentransformatorInfo
- Publication number
- EP2274754A1 EP2274754A1 EP08758482A EP08758482A EP2274754A1 EP 2274754 A1 EP2274754 A1 EP 2274754A1 EP 08758482 A EP08758482 A EP 08758482A EP 08758482 A EP08758482 A EP 08758482A EP 2274754 A1 EP2274754 A1 EP 2274754A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spacers
- fiber structure
- transformer according
- voltage winding
- fibers
- 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
- 125000006850 spacer group Chemical group 0.000 claims abstract description 72
- 238000004804 winding Methods 0.000 claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims abstract description 4
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 3
- 239000000835 fiber Substances 0.000 claims description 52
- 238000004382 potting Methods 0.000 claims description 22
- 150000001875 compounds Chemical class 0.000 claims description 20
- 238000000465 moulding Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 239000004760 aramid Substances 0.000 claims description 2
- 229920006231 aramid fiber Polymers 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000004744 fabric Substances 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims 11
- 239000012783 reinforcing fiber Substances 0.000 claims 1
- 238000009826 distribution Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000001131 transforming effect Effects 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
- H01F27/323—Insulation between winding turns, between winding layers
-
- 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 having at least one high-voltage winding and one low-voltage winding, which are in operative connection with one another by an electromagnetic field, wherein each winding is constructed from winding conductors.
- transformers in the distribution of electrical energy by transforming or switching AC voltage from a high level to a low voltage level or vice versa.
- conductor windings which are wound around an annular iron core, which usually has a rectangular cross-section.
- EP 0 557 549 B1 discloses a method for producing a cast-resin cast power transformer having a wound strip core, preferably a cold-rolled ferroalloy, which has a preferred magnetic direction, and a toroidal transformer produced by this method.
- the distance between the upper and lower voltage windings must be kept very good and safe in order to avoid parasitic effects. In order to allow the highest possible stress on the insulation between the two windings, this insulation must be constructed as undisturbed as possible. But this is an unsolved problem.
- the stray channel of the windings that is the area between the upper and lower voltage windings, is subject to forces that could possibly lead to cracking in the casting, among other things due to temperature fluctuations. It would therefore be advantageous to reinforce this area mechanically. In addition, also occur Forces that could potentially lead to cracking in the potting. It would therefore be advantageous to reinforce this area mechanically. In addition, large forces also occur due to the magnetic flux in the stray channel between the individual windings of the windings. Especially when the clamping pressure is insufficient for the forces that occur, considerable permanent winding deformations or even winding breakdowns can occur.
- the invention provides that the high-voltage winding and the low-voltage winding have a defined distance from one another, are provided for its exact compliance spacers, which are arranged between the windings.
- the inventively provided spacers have a sufficient rigidity, which prevent the otherwise not be excluded disturbances during operation.
- the spacers on a cross-sectional shape which avoids sharp edges and is optimized for workability and reliability.
- the spacers are provided with a circular cross section or with an oval or with a rectangular cross section.
- the longitudinal edges of the spacers are provided with a radius in the dry-type transformer according to the invention.
- the fiber structure of rovings made of high-strength, electrically nonconductive fibers or of a fabric of high-strength, electrically non-conductive fibers intended for reinforcing the spacers can be advantageously formed by a network of high-strength electrically non-conductive fibers.
- the fiber structure can be formed from glass fibers, from aramid fibers, from carbon fibers or a mixture of these fibers.
- the thickness of these fiber bundles is only a fraction thereof, namely approximately 1 to 10, that is, the fiber bundles are 1 mm thick and the spacers are 10 mm thick.
- the fiber structure provided for reinforcing the spacers is at least partially integrated into the spacers, wherein the fibers forming the fiber structure can be locally introduced into the spacers, for example by casting or inserting.
- the invention also relates to a method for the production of mechanically reinforced spacers, which are arranged to maintain the required distance between the high-voltage winding and the low-voltage winding of a dry-type transformer between the windings.
- the object is that the production of spacers for a dry-type transformer according to the invention should be made possible in a simple manner.
- the method according to the invention is characterized in that the mold bodies intended for the production of the spacers are positioned at a defined distance from each other. Thereafter, provided for mechanical reinforcement of the spacers fiber structure of high strength, electrically non-conductive fibers and the positioned moldings for the spacers are brought into contact with each other, preferably provided for processing fiber structure is placed locally on the moldings and then each mold body, for example, with a cover part is virtually closed, so that no leakage occurs when casting the potting compound.
- Another advantageous aspect of the method according to the invention is characterized in that before and during the casting of the potting compound in each case provided for the preparation of the spacers molding high-strength, electrically non-conductive fibers are inserted, which thus contribute to the mechanical stability of the method according to manufactured spacers.
- a further preferred measure for improving the mechanical strength of the spacers according to the invention is characterized in that, depending on the material provided as potting compound, the potting compound located in the moldings is cured before the moldings are removed from the spacers.
- the spacers are preferably made of the same material, which is later used for the casting the entire winding should be used.
- the surface of the spacer is prepared so that there is the best possible adhesion of the potting compound on the respective spacer.
- This reinforcement is also integrated into the still necessary spacers, that is, the mechanical reinforcing material is poured in, for example, in the spacers at certain intervals.
- the mechanical reinforcing material is poured in, for example, in the spacers at certain intervals.
- Fig. 1 is an overview of possible cross-sectional shapes of the spacers according to the invention.
- Fig. 2 shows an arrangement of spacers connected to a net-like reinforcing structure of fibers.
- Fig. 1 a number of different cross-sectional shapes for the spacers 10 according to the invention is shown, which are inserted between the winding layers of the upper winding not shown here.
- these spacers 10 are already inserted during the production of the winding, not shown, between the respective layers, so as to ensure an equalization of the load distribution or load application by forces caused as a result of temperature fluctuations but also by the magnetic flux in the stray channel between the individual turns of the windings.
- the preferred cross-sectional shapes of the spacers 10 according to the invention are those cross-sections which, on the one hand, on the one hand have a sufficiently high moment of resistance on the one hand and on the other hand can be processed well in the construction of the winding layers.
- Such forms have no sharp-edged areas where possible stresses can concentrate, but a harmonic course, for example, circular or rectangular shape with rounded edges or oval shape.
- the spacers are formed of electrically nonconductive high-strength fibers, which therefore have sufficient mechanical strength.
- the production of the spacers 10 according to the invention is preferably carried out in elongated moldings likewise not shown here, in which the mentioned fibers are inserted and subsequently enclosed by a preferably hardening potting compound introduced into the moldings.
- the spacers according to the invention can also be produced by means of an already pre-mixed potting compound, that is, the aforementioned potting compound, for example based on synthetic resin such as polyester resin is first enriched with fibers of different lengths and then subsequently cast into the moldings concerned.
- the fibers distributed uniformly in the potting compound form a fiber-reinforced web of high strength with the potting compound.
- FIG. 2 shows a variant according to the invention of the spacers 10 according to the invention, in which the spacers 10 arranged parallel to one another are connected to one another by means of a network 12 of high-strength non-conductive fibers 14.
- 10 are provided as a spacer with circular cross-section.
- the reticulated fiber structure 12 is in this case virtually integrally connected to the spacers 10 located next to one another and thus provides an additional reinforcement of the spacers 10 by forming a unit with the fiber bundles 14 delimiting the respective net stitches.
- spacers 10 For the preparation of this reinforced by the network 12 spacers 10 is namely provided that first the network 12 is made of high-strength fibers 14, then each with the provided for the preparation of the spacers 10, not shown here shaped bodies is brought together and then of the for manufacturing the spacer 10 provided potting compound is locally enclosed when it is spent in the moldings for the spacers 10.
- Fig. 2 two views are provided for this purpose, namely a side view shown above and a plan view and sectional view shown below, which extends at an angle of 90 ° to the side view.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL08758482T PL2274754T3 (pl) | 2008-05-13 | 2008-05-13 | Transformator suchy |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2008/003820 WO2009138095A1 (de) | 2008-05-13 | 2008-05-13 | Trockentransformator |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2274754A1 true EP2274754A1 (de) | 2011-01-19 |
EP2274754B1 EP2274754B1 (de) | 2011-08-31 |
Family
ID=40433722
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08758482A Active EP2274754B1 (de) | 2008-05-13 | 2008-05-13 | Trockentransformator |
Country Status (9)
Country | Link |
---|---|
US (1) | US8310330B2 (de) |
EP (1) | EP2274754B1 (de) |
CN (1) | CN102027553B (de) |
AT (1) | ATE522916T1 (de) |
BR (1) | BRPI0822676B8 (de) |
CA (1) | CA2723248C (de) |
ES (1) | ES2370182T3 (de) |
PL (1) | PL2274754T3 (de) |
WO (1) | WO2009138095A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102443928A (zh) * | 2011-10-29 | 2012-05-09 | 常熟市福嘉丽织造有限公司 | 新型电绝缘面料 |
WO2017040303A1 (en) * | 2015-08-29 | 2017-03-09 | Abb Schweiz Ag | Transformer, coil assembly and spacer |
DE102017220781B4 (de) * | 2017-11-21 | 2019-09-26 | Siemens Aktiengesellschaft | Verfahren zum Herstellen von Abstandshaltern für eine Wicklungseinheit und Wicklungseinheit |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1495823A (en) * | 1921-01-14 | 1924-05-27 | Acme Wire Company | Electrical coil and method of making the same |
DE1488794A1 (de) * | 1951-01-28 | 1969-02-20 | Bbc Brown Boveri & Cie | Jochpressteil fuer Trockentransformatoren |
US2783441A (en) * | 1952-07-25 | 1957-02-26 | Gen Electric | Transformer |
CH324509A (de) * | 1954-08-30 | 1957-09-30 | Mcgraw Electric Co | Verfahren zur Herstellung der Isolation für den Spulenaufbau bei elektrischen Vorrichtungen und gemäss diesem Verfahren hergestellte Isolation |
CH487485A (de) * | 1968-01-30 | 1970-03-15 | High Voltage Engineering Corp | Hochspannungs-Induktionsgerät |
DE1948848A1 (de) * | 1969-09-26 | 1971-04-01 | Siemens Ag | Spulenwicklung |
US3748616A (en) * | 1972-03-24 | 1973-07-24 | Ite Imperial Corp | Transformer winding structure using corrugated spacers |
CH567327A5 (de) * | 1973-12-19 | 1975-09-30 | Bbc Brown Boveri & Cie | |
JPS54131717A (en) * | 1978-04-05 | 1979-10-13 | Hitachi Ltd | Inter-winding insulation apparatus of oil-filled transformer |
US4238753A (en) * | 1978-06-02 | 1980-12-09 | Trw Inc. | Transformer core gapping and lead anchoring arrangement |
DE3101217C2 (de) * | 1981-01-16 | 1984-08-23 | Smit Transformatoren B.V., Nijmegen | Wicklung für einen Trockentransformator mit Abstandshalteanordnung |
SE426116B (sv) * | 1981-04-30 | 1982-12-06 | Asea Ab | Krafttransformator eller reaktor |
ES2076580T3 (es) * | 1992-02-26 | 1995-11-01 | Volker Hanser | Transformador toroidal. |
US5396210A (en) * | 1993-03-17 | 1995-03-07 | Square D Company | Dry-type transformer and method of manufacturing |
US5383266A (en) * | 1993-03-17 | 1995-01-24 | Square D Company | Method of manufacturing a laminated coil to prevent expansion during coil loading |
TW299064U (en) * | 1995-01-23 | 1997-02-21 | Hitachi Ltd | Resin molded transformer |
GB2331853A (en) * | 1997-11-28 | 1999-06-02 | Asea Brown Boveri | Transformer |
US6806803B2 (en) * | 2002-12-06 | 2004-10-19 | Square D Company | Transformer winding |
US7688170B2 (en) * | 2004-06-01 | 2010-03-30 | Abb Technology Ag | Transformer coil assembly |
-
2008
- 2008-05-13 AT AT08758482T patent/ATE522916T1/de active
- 2008-05-13 CA CA2723248A patent/CA2723248C/en active Active
- 2008-05-13 ES ES08758482T patent/ES2370182T3/es active Active
- 2008-05-13 EP EP08758482A patent/EP2274754B1/de active Active
- 2008-05-13 BR BRPI0822676A patent/BRPI0822676B8/pt active IP Right Grant
- 2008-05-13 PL PL08758482T patent/PL2274754T3/pl unknown
- 2008-05-13 CN CN200880129248.0A patent/CN102027553B/zh active Active
- 2008-05-13 WO PCT/EP2008/003820 patent/WO2009138095A1/de active Application Filing
-
2010
- 2010-11-12 US US12/945,261 patent/US8310330B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2009138095A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20110273259A1 (en) | 2011-11-10 |
ES2370182T3 (es) | 2011-12-13 |
ATE522916T1 (de) | 2011-09-15 |
PL2274754T3 (pl) | 2012-01-31 |
BRPI0822676A2 (pt) | 2015-06-30 |
US8310330B2 (en) | 2012-11-13 |
CA2723248C (en) | 2015-04-14 |
EP2274754B1 (de) | 2011-08-31 |
WO2009138095A1 (de) | 2009-11-19 |
BRPI0822676B8 (pt) | 2023-11-07 |
BRPI0822676A8 (pt) | 2022-12-13 |
BRPI0822676B1 (pt) | 2023-10-10 |
CN102027553B (zh) | 2015-05-20 |
CN102027553A (zh) | 2011-04-20 |
CA2723248A1 (en) | 2009-11-19 |
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