EP2274754B1 - Trockentransformator - Google Patents

Trockentransformator Download PDF

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Publication number
EP2274754B1
EP2274754B1 EP08758482A EP08758482A EP2274754B1 EP 2274754 B1 EP2274754 B1 EP 2274754B1 EP 08758482 A EP08758482 A EP 08758482A EP 08758482 A EP08758482 A EP 08758482A EP 2274754 B1 EP2274754 B1 EP 2274754B1
Authority
EP
European Patent Office
Prior art keywords
spacers
dry
type transformer
fiber structure
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.)
Active
Application number
EP08758482A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2274754A1 (de
Inventor
Charles W. Johnson
Jan Leander
Karel Bilek
Benjamin Weber
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40433722&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2274754(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by ABB Technology AG filed Critical ABB Technology AG
Priority to PL08758482T priority Critical patent/PL2274754T3/pl
Publication of EP2274754A1 publication Critical patent/EP2274754A1/de
Application granted granted Critical
Publication of EP2274754B1 publication Critical patent/EP2274754B1/de
Active legal-status Critical Current
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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 operatively connected to one another by an electromagnetic field, wherein each winding is constructed of winding conductors, and is provided between the upper and lower-voltage winding a defined distance by spacing.
  • Such dry-type transformers are made, for example EP 0 056 580 . CH 324 509 . CH 487 485 and US 4,238,753 known.
  • 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.
  • 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 high-voltage winding and the low-voltage winding have a defined distance from one another, to the exact compliance spacers are provided which are arranged between the windings.
  • the inventively provided spacers are mechanically reinforced by means of a fiber structure and connect to each other, and have 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 preparation of the 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.
  • the inventively provided for mechanical reinforcement of the spacer 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 during the casting of the potting compound.
  • the potting compound is poured into this arrangement, that is, in the spaced apart from each other positioned moldings for the spacers with the interposed fiber structure, whereby the fiber structure is at least partially enclosed by the potting compound with the spacers and anchored therein.
  • 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 later for the potting the entire winding should be used.
  • the surface of the spacers 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 a series of different cross-sectional shapes for the spacers 10 of the invention 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 a variant according to the invention of the spacer 10 according to the invention is shown, in which the mutually parallel spacers 10 are connected by means of a network 12 of high-strength non-conductive fibers 14 with each other.
  • 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 For this purpose, two views are provided, 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Moulding By Coating Moulds (AREA)
EP08758482A 2008-05-13 2008-05-13 Trockentransformator Active EP2274754B1 (de)

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 EP2274754A1 (de) 2011-01-19
EP2274754B1 true 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 (pl)
EP (1) EP2274754B1 (pl)
CN (1) CN102027553B (pl)
AT (1) ATE522916T1 (pl)
BR (1) BRPI0822676B1 (pl)
CA (1) CA2723248C (pl)
ES (1) ES2370182T3 (pl)
PL (1) PL2274754T3 (pl)
WO (1) WO2009138095A1 (pl)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 (pl) * 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
EP0557549B1 (de) * 1992-02-26 1995-08-30 HANSER, Volker Ringkerntransformator
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

Also Published As

Publication number Publication date
CA2723248A1 (en) 2009-11-19
WO2009138095A1 (de) 2009-11-19
US20110273259A1 (en) 2011-11-10
BRPI0822676A8 (pt) 2022-12-13
PL2274754T3 (pl) 2012-01-31
CN102027553A (zh) 2011-04-20
BRPI0822676A2 (pt) 2015-06-30
BRPI0822676B8 (pt) 2023-10-10
CN102027553B (zh) 2015-05-20
US8310330B2 (en) 2012-11-13
CA2723248C (en) 2015-04-14
EP2274754A1 (de) 2011-01-19
ES2370182T3 (es) 2011-12-13
ATE522916T1 (de) 2011-09-15
BRPI0822676B1 (pt) 2023-10-10

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