EP2518739B1 - Isolierendes Gehäuse einer Hochspannungswicklung - Google Patents

Isolierendes Gehäuse einer Hochspannungswicklung Download PDF

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Publication number
EP2518739B1
EP2518739B1 EP20110460020 EP11460020A EP2518739B1 EP 2518739 B1 EP2518739 B1 EP 2518739B1 EP 20110460020 EP20110460020 EP 20110460020 EP 11460020 A EP11460020 A EP 11460020A EP 2518739 B1 EP2518739 B1 EP 2518739B1
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EP
European Patent Office
Prior art keywords
cylinder
situated
insulating casing
winding
thick
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
EP20110460020
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English (en)
French (fr)
Other versions
EP2518739A1 (de
Inventor
Krzysztof Kasza
Tomasz Nowak
Robert Platek
Francisco Arauzo
Rafael Murillo
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 Research Ltd Switzerland
ABB Research Ltd Sweden
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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Publication date
Application filed by ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Priority to EP20110460020 priority Critical patent/EP2518739B1/de
Publication of EP2518739A1 publication Critical patent/EP2518739A1/de
Application granted granted Critical
Publication of EP2518739B1 publication Critical patent/EP2518739B1/de
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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
    • H01F27/327—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings

Definitions

  • the invention relates to the insulating casing of a high-voltage winding, applicable in high-voltage electric power equipment in which metal conducting elements are embedded in resin insulation, and in particular it relates to the casing of a dry transformer winding.
  • High-voltage electric power equipment comprising high-voltage conducting elements embedded in resin insulation require insulation which is durable and resistant to variable external stresses. Internal mechanical stresses which cause cracks in insulation can be the effect of both variable temperatures associated with the insulation pouring and curing processes and of temperature differences occurring during the operation of the piece of equipment. Temperature differences inside resin insulation arising during the operation of equipment result from heating-up of metal conducting elements caused by the flow of current. At the same time, resin insulation directly adjacent to those elements is heated up, while its other parts are cooled by ambient air. Unequal temperature distribution can result in the occurrence of great stresses and in deformation of material, which in consequence can lead to cracks which disqualify the product from further operation. In the operation of high-voltage equipment with resin insulation, especially dangerous are low temperatures reaching minus 50 degrees Celsius.
  • Switching the flow of current on in a piece of equipment with resin insulation that has been cooled down to such low temperatures can result in the occurrence of particularly large temperature gradients and, in consequence, internal stresses.
  • a proper design of the shape of resin insulation can improve both the distribution of temperatures inside equipment and the mechanical resistance of insulation.
  • Insulating casings of the windings of dry high-voltage resin transformers are made in the form of thick-walled cylinders which are provided with a side strip situated longitudinally on the external surface of the cylinder.
  • This strip is made of the same material as the cylinder and it is formed by the thickened wall of the cylinder.
  • the thicker layer of resin insulation on the strip is necessary to insulate metal elements which form the high-voltage electric connection between the winding and the terminals of the main connections and of the tap connections.
  • the use of a thicker resin layer around the whole circumference of the winding would allow to keep a cylindrical shape of the casing, however, it would require the use of a larger quantity of material and, due to the poor thermal conductivity of resin insulation, it would hamper heat conduction from the winding during its normal operation. That is why the insulating casing of the high-voltage winding of dry resin transformers in the form of thick-walled cylinders provided with side strips which are situated longitudinally on the external surface and which are a thickened wall of the cylinder permit material savings and offer improvement in heat conductance from the winding at the cost of resignation from keeping the ideal cylindrical shape of the winding insulation.
  • An inconvenience of the presented casing made of thermoplastic material is the lack of an efficient solution to the problem of cracking of the casings caused by abrupt changes in temperatures occurring inside the insulating casings when high-voltage conductors are sometimes heated to a temperature of 140 degrees Celsius while the temperature outside is very low, sometimes as low as minus 50 degrees Celsius.
  • a considerable temperature difference can be reached between the cylindrical part of insulation containing the winding, which together with the winding will quickly increase its temperature, and the longitudinal strip containing the main connections and the tap connections, whose temperature will be much lower.
  • the temperature difference can result in cracks in the casing around the strip in the longitudinal direction of the cylinder and on the strip in the transverse direction of the cylinder.
  • the essence of the insulating casing of a high-voltage winding comprising a thick-walled cylinder of an epoxy resin material in which the high-voltage winding is embedded, fitted with a side strip situated longitudinally on the external surface of the thick-walled cylinder with phase connection surfaces, with places for installing electrical connections connected to the winding, and with the tap connection surface, with a place for installing the tap changer, is that the side strip has recesses which are situated on the external surface of the side strip between the phase connection surfaces and the tap connection surface.
  • the phase connection surfaces with places for installing electrical connections connected to the winding, from the front sides of the thick-walled cylinder have at least one external cut-off whose plane is situated at an acute angle " ⁇ " in relation to the front plane of the thick-walled cylinder.
  • the side strip in the place where the cut-off is situated in the cross-section of thick-walled cylinder has a shape approximate to a rectangle, a trapezoid, a triangle or an oval, and the cut-offs of the side strip in the longitudinal section of the thick-walled cylinder have the shape approximate to a rectangle, a trapezoid, a triangle or an oval.
  • At least one row of transverse convexities and/or longitudinal convexities is situated at least one row of transverse convexities and/or longitudinal convexities.
  • the longitudinal convexities are situated longitudinally or askew in relation to the axis of the thick-walled cylinder in a location remote from the edge "z" of the side strip, and in cross-section they have a shape approximate to a rectangle, a trapezoid, a triangle or an oval.
  • the transverse convexities are situated transversely in relation to the axis of the thick-walled cylinder, and in longitudinal section they have a shape approximate to a rectangle, a trapezoid, a triangle or an oval.
  • the insulating casing of a high-voltage winding according to claims 1-7 is applicable as a high-voltage casing in a dry transformer.
  • the advantage of the insulating casing according to the invention is its simple design permitting a reduction or elimination of internal mechanical stresses inside the casing, which are the cause of cracks in the casing. Thanks to the cut-offs of a specific shape, situated on the side strip, the danger of transverse cracks in the casing has been eliminated. Thanks to the cut-offs made on the connection surfaces with places for fitting the winding connections, the danger of longitudinal cracks in the casing has been eliminated. Moreover, the casing according to the invention is made of epoxy resin whose quantity used for casting the casing is smaller compared to known casings with reinforcing strips, which reduces the weight of the casing and brings material savings.
  • the insulating casing according to the invention is the product of pouring a high-voltage winding placed in a mold with a suitable insulating material. After suitable curing of the cast, the insulating casing has the shape of a thick-walled cylinder 1 with a side strip 2 which is situated on the external surface of the cylinder, parallel to the axis of the cylinder. On both ends of the strip 2 there are phase connection surfaces 3 which are places for fitting the main connections of the winding. On the strip 2 there is also a tap connection surface 4 which is the place for fitting the tap changer and which is situated between the phase connection surfaces 3. On the external surface of the strip 2 there are situated recesses 5 which are arranged between the phase connection surfaces 3 and the tap connection surface 4.
  • the phase connection surfaces 3 on the front sides of the thick-walled cylinder 1 have at least one external cut-off 6 whose plane is situated at an acute angle " ⁇ " in relation to the front plane 7 of the thick-walled cylinder 1.
  • a high-voltage winding 8 is embedded in the material of the thick-walled cylinder.
  • the high-voltage winding is provided with conducting terminals which are lead outside the external surface of the cylinder 1, in the dedicated places, i.e. on the outside of the phase connection surfaces 3 and on the outside of the tap connection surface 4, which is not shown in the drawings.
  • the shapes of the recesses 5 in different embodiments of the invention are shown as broken-out sections "a" from the longitudinal section of the casing made by means of the longitudinal plane A-A crossing the axis of the cylinder 1.
  • the recesses 5 have a shape approximate to a rectangle - fig. 3 , or to a trapezoid - fig. 4 , or to a triangle - fig. 5 , or to an oval - fig. 6 .
  • the recesses 5 have a longitudinal edge "z" which is the edge of the bottom of the recess 5.
  • the shapes of the strip 2 at the location of the recesses 5 in different embodiments of the invention, are shown as broken-out sections "c" from the casing cross-section B-B.
  • the shape of the strip 2 protruding above the external surface of the cylinder 1 is approximate to a rectangle - fig. 12 , or to a trapezoid - fig. 13 , or to a triangle - fig. 14 , or to an oval - fig. 15 .
  • the surfaces of the recesses 5 are basically smooth i.e. they do not have above-average surface irregularities that could be seen with the unaided eye.
  • the surfaces of the recesses 5 has visible transverse convexities 9 which are arranged transversely to the axis of the cylinder 1 in one or in multiple rows.
  • the transverse convexities 9 are shown in the drawing as broken-out sections "b" and in cross-section they have a shape approximate to a rectangle - fig. 7 and 8 , or to a trapezoid - fig. 9 , or to a triangle - fig. 10 , or to an oval - fig. 11 .
  • longitudinal convexities 10 which are arranged longitudinally in relation to the axis of the cylinder 1 in one or in multiple rows.
  • the longitudinal convexities 10 are presented in the drawing as broken-out sections "d" and in cross-section they have a shape approximate to a rectangle - fig. 16 and 17 , or to a trapezoid - fig. 18 , or to a triangle - fig. 19 , or to an oval - fig.20 .
  • the shoulder on the thick-walled cylinder 1 appearing in known solutions along the whole length of the casing and defined as the side strip 2 is reduced on segments between the main connections and the taps.
  • Such design to a large extent eliminates the occurrence of strong internal stresses associated with a great temperature gradient, which prevents internal transverse cracks.
  • the application of an external cut-off on the phase connection surfaces contributes to a reduction in internal stresses, which prevents internal longitudinal cracks.
  • the casing of a high-voltage winding Due to the reduction in material the casing of a high-voltage winding has an approximately cylindrical shape, which results in a reduction in temperature gradients and ensures a homogenous distribution of internal stresses, which reduces the risk of cracking of the casing.
  • the reduction in the level of internal stresses in the component makes it possible to eliminate the external reinforcing mesh, which constitutes an additional reduction in the cost of production.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)

Claims (7)

  1. Ein isolierendes Gehäuse einer Hochspannungswicklung, das aus einem dickwandigen Zylinder (1) aus Epoxidharz besteht, in den die Hochspannungswicklung eingebettet ist, und das mit einer seitlichen Leiste (2) ausgestattet ist, die längs auf der äußeren Oberfläche des dickwandigen Zylinders (1) angeordnet ist und auf der sich Phasen-Kontaktoberflächen (3) mit Stellen zur Herstellung von elektrischen Anschlüssen, die mit der Wicklung (8) verbunden sind, befinden sowie eine Anzapfungs-Kontaktoberfläche (4) mit einer Stelle zur Herstellung der Anzapfungen des Umschalters, dadurch gekennzeichnet, dass die seitliche Leiste (2) Aussparungen (5) besitzt, die sich auf der Außenseite der Leiste (2) zwischen den Phasen-Kontaktoberflächen (3) und der Anzapfungs-Kontaktoberfläche (4) befinden.
  2. Ein isolierendes Gehäuse gemäß Anspruch 1, dadurch gekennzeichnet, dass die Phasen-Kontaktoberflächen (3) mit Stellen zur Herstellung von elektrischen Anschlüssen mit der Wicklung (8) verbunden sind, von den Vorderseiten des dickwandigen Zylinders (1) wenigstens eine äußere Abscherung (6) besitzen, deren Fläche in einem spitzen Winkel (α) zur Frontfläche des dickwandigen Zylinders (1) angeordnet ist.
  3. Ein isolierendes Gehäuse gemäß Anspruch 1-2, dadurch gekennzeichnet, dass die seitliche Leiste (2) an der Stelle der Aussparungen (5), im Querschnitt des Zylinders (1), annähernd die Form eines Rechtecks, eines Trapezes, eines Dreiecks oder eines Ovals hat und die Aussparungen (5) im Längsschnitt des Zylinders (1) annähernd die Form eines Rechtecks, eines Trapezes, eines Dreiecks oder eines Ovals haben.
  4. Ein isolierendes Gehäuse gemäß Anspruch 1-3, dadurch gekennzeichnet, dass sich auf der Oberfläche, die den Boden der Aussparung (5) bildet, sich wenigstens eine Reihe von transversalen konvexen Formen (9) und/oder longitudinalen konvexen Formen (10) befindet.
  5. Ein isolierendes Gehäuse gemäß Anspruch 4, dadurch gekennzeichnet, dass die longitudinalen konvexen Formen (10) längs oder schräg in Beziehung zur Achse des Zylinders (1) in einer Lage, die vom Ende (z) der seitlichen Leiste (2) entfernt ist, angeordnet sind und im Querschnitt annähernd die Form eines Rechtecks, eines Trapezes, eines Dreiecks oder eines Ovals haben.
  6. Ein isolierendes Gehäuse gemäß Anspruch 4, dadurch gekennzeichnet, dass die transversal angeordneten konvexen Formen (9) quer in Beziehung zur Achse des Zylinders (1) angeordnet sind und im Querschnitt annähernd die Form eines Rechtecks, eines Trapezes, eines Dreiecks oder eines Ovals hat.
  7. Anwendung des isolierenden Gehäuses einer Hochspannungswicklung gemäß Anspruch 1-6 als Gehäuse in einem Trockentransformator.
EP20110460020 2011-04-27 2011-04-27 Isolierendes Gehäuse einer Hochspannungswicklung Active EP2518739B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20110460020 EP2518739B1 (de) 2011-04-27 2011-04-27 Isolierendes Gehäuse einer Hochspannungswicklung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20110460020 EP2518739B1 (de) 2011-04-27 2011-04-27 Isolierendes Gehäuse einer Hochspannungswicklung

Publications (2)

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EP2518739A1 EP2518739A1 (de) 2012-10-31
EP2518739B1 true EP2518739B1 (de) 2013-03-20

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2797088A1 (de) * 2013-04-23 2014-10-29 ABB Technology AG Spule für einen Trockentransformator und Trockentransformator
US9847167B2 (en) * 2013-07-18 2017-12-19 Abb Schweiz Ag Enhanced track resistant dome structure for dry-type cast coil transformer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2675086B2 (ja) * 1988-07-22 1997-11-12 株式会社日立製作所 樹脂モールドコイル
JP2524011B2 (ja) * 1991-05-23 1996-08-14 株式会社日立製作所 高圧コイル注型用熱硬化性樹脂組成物、該組成物で注型、硬化してなるモ―ルドコイル、パネル
JP2000517480A (ja) 1996-09-04 2000-12-26 イー・アイ・デュポン・ドゥ・ヌムール・アンド・カンパニー 乾式型高圧巻線

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