WO2014135205A1 - Transformateur électrique ou bobine de choc ainsi que structure bobinée comprenant une pièce d'écartement - Google Patents

Transformateur électrique ou bobine de choc ainsi que structure bobinée comprenant une pièce d'écartement Download PDF

Info

Publication number
WO2014135205A1
WO2014135205A1 PCT/EP2013/054466 EP2013054466W WO2014135205A1 WO 2014135205 A1 WO2014135205 A1 WO 2014135205A1 EP 2013054466 W EP2013054466 W EP 2013054466W WO 2014135205 A1 WO2014135205 A1 WO 2014135205A1
Authority
WO
WIPO (PCT)
Prior art keywords
spacer
winding
transformer
choke
winding arrangement
Prior art date
Application number
PCT/EP2013/054466
Other languages
German (de)
English (en)
Inventor
Markus Georg ORTNER
Friedrich Baumann
Robert Schwarz
Original Assignee
Siemens Ag Österreich
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 Siemens Ag Österreich filed Critical Siemens Ag Österreich
Priority to PCT/EP2013/054466 priority Critical patent/WO2014135205A1/fr
Publication of WO2014135205A1 publication Critical patent/WO2014135205A1/fr

Links

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
    • H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
    • 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 an electrical transformer or a reactor, with a winding, with an insulating cooling medium (eg transformer oil), which surrounds the winding, with at least one spacer, which is made of an electrical insulation material having side surfaces and opposing contact surfaces, to set a distance in an arrangement between adjacent conductors, or a conductor and a machine part.
  • an insulating cooling medium eg transformer oil
  • the invention further relates to a winding arrangement for an electrical machine, in particular a
  • a power transformer or a choke having a winding, with a Isoaltions cooling medium, which surrounds the winding, with at least one spacer made of an insulator having side surfaces and opposing abutment surfaces, to be arranged between adjacent
  • Ladders or a ladder and a machine part, to specify a distance.
  • the present invention further relates to a
  • Body part having side surfaces and two opposing abutment surfaces, with which it rests in an arrangement between adjacent conductors or a conductor and a machine parts to thereby specify a defined distance.
  • Power distribution networks are used in a voltage range above 1000 V, may comprise windings, which are formed from a spirally wound electrical conductor.
  • the axial distance between conductors can be specified by so-called spacers.
  • a spacer may be a prismatic spacer made of an electrical insulator.
  • a mechanical tensioning device compresses the winding arrangement in the axial direction, so that the spacers between the layers of the conductors are fixed by pressing.
  • Circumferential spacers may also be present, which are arranged in a gap, so that for the purpose of cooling the cooling medium, e.g. Transformer oil, the
  • the size of the distance depends, inter alia, on the insulation requirement, which also depends on whether the electrical conductors of the winding itself are insulated, e.g. with a strip of paper wrapped helically around the ladder.
  • the insulation requirement which also depends on whether the electrical conductors of the winding itself are insulated, e.g. with a strip of paper wrapped helically around the ladder.
  • Spacers come in the form of a bar used.
  • transformer oil is usually used in a transformer or a choke.
  • gaseous isolation cooling medium e.g. Own or
  • the material used for a spacer of an electrical winding usually has a permittivity that is different from the permittivity of the used isoaltion cooling medium.
  • the consequence of this is that in the transition zone, that is, in the transition between side surfaces and contact surfaces of the spacer, due to the different dielectric constant of spacer material and insulating cooling medium (transformer oil), the electric field is not homogeneously distributed. In the page area can Peak values of the electric field strength occur, which can lead to a local overuse of the insulating cooling medium. This can lead to an electrical flashover.
  • Another object of the invention is to provide a
  • Insulating cooling medium touched side surfaces are formed in the manner of a groove, so that in a transition region to a conductor or to a machine part a tapered, wedge-shaped foot part is formed.
  • the invention is Compared to the prior art, in which spacers are always used which, viewed in cross-section, have a convex shape in the contact area, the invention is
  • the winding is therefore provided with spacers which each have a transition region lying to a contact surface, which is formed as a groove with a tapered edge.
  • Invention is the angle formed between the contact surface and side surface of the spacer not an acute angle, but an obtuse angle. In the following, this angle will be at the contact line between spacer and conductor
  • contact angle or machine part referred to as contact angle or as immersion angle.
  • Materials are basically all materials in question, which are used in transformer construction, e.g.
  • Cellulosic material such as pressboard or a plastic or other suitable material for electrical insulation.
  • the contact angle is greater than 90 °.
  • the contact angle is not an acute angle, but an obtuse angle. By appropriate magnitude of this angle, the cause of partial electrical discharges, which may also feel electrical breakdown, is eliminated.
  • the shape of the recess is predetermined by a contour function, which is continuous in its derivative.
  • Transformer oil is electrically overstressed, largely reduced.
  • a substantially kink-free side surface can also be achieved in that at least in the transition region in each case opposite side surfaces by a
  • Contour function is given, which is formed by a polygon.
  • a side surface can also be a composition of flat surface sections, provided that the number is big enough and not the field course
  • the recess can be produced particularly easily if the contour function at least in one section
  • Circular arc has. This can be used with common
  • Tools are formed in a simple way, a kink-free side surface, which opens together with the investment / contact surface in a pointed foot part. In the area of the contact line the tangent goes in the
  • Another advantage is the fact that to overcome a greater distance prefabricated spacers (even different thickness) in one
  • Modular system can be used. A special preparation of a spacer is therefore not
  • the spacer is in the form of a strip.
  • a strip becomes radially in a winding during the winding production
  • the strip is installed in the axial direction in the manufacture of the electrical winding.
  • the insulation material used is
  • Spacer may e.g. be made of Transformerboard.
  • Transformerboard can be resin impregnated. If particularly high insulation properties are required, can as a insulating material, a plastic, especially a
  • the isolation cooling medium may also be gaseous.
  • the spacer has a lying to a contact surface transition region whose shape is formed as a groove, so seen in a cross section contact surface and side surface form a wedge with a sharp edge.
  • a particularly preferred embodiment of the spacer is characterized in that the shape of the groove is formed by a recess on the side surfaces of a prismatic body, which by a curved
  • Contour function is given, the contour function is a continuous function. This ensures that the electric field strength does not change abruptly in the lateral area of a prismatic spacer.
  • a bar can be equal to a coil
  • the strip cellulose As a preferred material for the strip cellulose, paper, Transformerboard or a plastic is used. With a particularly high dielectric strength, it may be advantageous if the spacer is made of a polyamide. In special applications, in particular a
  • the spacer may preferably also in a
  • High voltage coil can be used, which is not surrounded by a liquid, but by a gaseous insulating cooling medium (air coil) are used.
  • Figure 1 shows a detail of an electrical winding in a three-dimensional view, wherein according to the invention, a spacer is used which has a concave cross-sectional profile;
  • Figure 2 is a cross-section through a spacer pressed between an upper and a lower conductor and having a concave cross-sectional profile
  • FIG. 3 shows a detail X of Figure 2 for a particular
  • FIG. 4 shows a detail X of FIG. 2 for a contact angle of 165 °
  • FIG. 5 shows a detail X of FIG. 2 for a contact angle of 150 °
  • FIG. 6 shows a representation of the detail X, which is shown in FIG.
  • Transition region shows the wedge-shaped foot of the spacer greatly enlarged
  • FIG. 7 shows another embodiment of the invention, in which a
  • FIG. 8 shows a prismatic spacer in one
  • Figure 9 is a schematic representation which both the
  • Figure 10 shows a known spacer, in which all four
  • Edges are rounded
  • Figure 11 detail Y of Figure 10 with a contact angle of
  • FIG. 12 shows detail Y of FIG. 10 with a contact angle of
  • FIG. 13 shows detail Y of FIG. 10 with a contact angle of
  • FIG. 1 shows a section of an electrical winding 1 in a three-dimensional view.
  • the individual conductors 4, 5 concentrically surround a shaft 17 around an axis 17
  • the soft magnetic leg 16 of a transformer or a choke may be of different design.
  • the electrical conductors 4,5 can at a
  • Spacers 3 of these spacers 3 are in Figure 1 representatively three extending in the radial direction strip-shaped
  • Each of these strips 3 is between an upper winding layer 14 and a lower winding layer 15 in the axial direction by means of a
  • transformer oil has a relevant frequency range (50 Hz or 60 Hz)
  • Transformer oil and spacers is distorted. It occurs in the gusset locally an increase in the electric field strength. Particularly stressed is the insulation medium, which is located in the region of this gusset. This is where the invention intervenes. She hits you
  • FIG. 2 shows an embodiment of the invention
  • Spacer 3 in a cross section.
  • the spacer 3 is pressed with its contact surfaces 13 between an upper conductor 4 and a lower conductor 5.
  • the cross-sectional profile is concave, with opposite side surfaces 6, which are in contact with the transformer oil 2, with a
  • Recess in the form of a groove 7 are provided. These two recesses 7 are symmetrical on both sides. The
  • each of the recesses 7 is designed such that in the area between the spacer 3 and the conductor there is a concave fillet, a groove, is formed, so that in each transition region 11 of spacer 3 and transformer oil left and right, a wedge-shaped foot part is formed, which tapers towards the edge 8 point. But it can also be provided with a groove in addition, the two end faces.
  • FIG. 2 a detail is marked in FIG. 2 with the reference symbol "X”, which is shown enlarged in the following FIGS. 3, 4, 5 and will be explained in more detail below.
  • Figure 3 shows a particularly preferred embodiment of the
  • Embodiment is applied to the edge 8, opened to the transformer oil 2 contact angle 9 180 °. Further possible embodiments of the invention are shown in FIG. 4 with a contact angle 9 of 165 ° and in FIG. 5 with a contact angle of 150 °. FIG. 6 shows, in an even greater enlargement, the wedge-shaped foot part 11. The edge 8 is here expiring in a fibrous manner. This fibrous formation of the edge 8 is formed automatically in a machining production of
  • the contour function 10 is a curved function that is continuously differentiable, so it has no discontinuities.
  • the side surface 6 merges seamlessly into the plane of the contact surface 13.
  • the contact angle 9 is increased well beyond 90 °.
  • this has the consequence that the electrical stress of the transformer oil 3 in This transition zone is comparatively low.
  • Another advantage is the fact that the foot part 11 resiliently yields during a mechanical pressure between two conductors. On the one hand, this means that an electrical conductor surrounded by insulation is less likely to be damaged by the pressing force.
  • Figure 7 shows an embodiment of the invention in which a comparatively larger distance 23 between two conductors 4 and 5 is predetermined by a plurality of spacers 3 stacked on one another.
  • the respective side surfaces 6 of the stack are each provided with groove-shaped recesses in the form of a groove.
  • contact surfaces lying on top of one another in the region of the stack are so stacked on one another that a dangerous gusset with overloaded insulation medium can not form between them.
  • Even with a stack of superimposed spacers can be achieved by the concave profile that a lateral inhomogeneity of the electric field can be effectively counteracted.
  • FIG. 8 shows the spacer 3 according to the invention in a perspective view.
  • the spacer 3 has a prismatic body part having a height 20, a width 21, and a length 22.
  • the length 22 can be very different: the length 22 is very short if it is to correspond to the width of a flat conductor; the length 22 corresponds to a radial arrangement between adjacent conductors about the radial thickness of a winding.
  • Figure 9 shows a schematic representation of the use of the spacer according to the invention in an electrical winding 1.
  • the spacer 3 is to be seen once between a conductor 4 and a machine part 19, another time as an axial or radial spacer between two conductors 4 and 5.
  • the spacer 3 with the concave cross-sectional profile can therefore not only in
  • the Barrier system can be used.
  • the barrier system is used to insulate windings between each other or between windings and parts with ground potential. This differs from the isolation system
  • Barrier system in that at least one of the two contact surfaces of the spacer 3 is not in contact with a bare conductor 4,5 or an insulated conductor, but with a so-called barrier. It may be that the spacer and the barrier are made of the same material.
  • FIG. 11 shows a known spacer with a contact angle 9 of 0 °
  • Figure 12 is a contact angle 9 of 15 °
  • Figure 13 is a contact angle 9 of 30 °. All these known
  • Ladders 3 and 4 is pressed, also has the pressing force
  • Isolation system is possible. The probability of breakdowns due to voltage overstress is lowered.
  • Insulation of the conductor is not damaged even at a higher pressing force. Due to the elasticity of the material, the projecting edge remains biased. It can also form no unfavorable cavity between the spacer and the conductor insulation. By the soft yielding Property of the foot does not come to depressions in the insulation. Favorable also affects the conditional by the production of fibrous formation of the edge.
  • a radial distance can be used.
  • the strips are not arranged radially in the production of the winding, but in the direction of the leg axis 17.
  • the contour function does not necessarily have to be continuously curved, it is only important that the transition region is rounded concavely in the form of a groove and at the connection point kink-free in another
  • insulation cooling medium thus also includes gaseous media.
  • An advantageous use of the spacer can therefore also be in so-called high-voltage air coils.
  • an embodiment in aramid fiber as they are known for example under the brands Kevlar® or Nomex®, may be preferred. Compilation of the reference numbers used

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

L'invention concerne un transformateur électrique ou une bobine de choc, comprenant : un enroulement (1), un milieu réfrigérant isolant (2) qui entoure l'enroulement, au moins une pièce d'écartement (3) en contact par une surface d'appui (13) respective avec un conducteur (4, 5) ou avec une partie de machine (19) afin de prédéfinir un écartement. La pièce d'écartement (3) comporte une zone de raccordement (11) avec une surface d'appui (13), réalisée sous la forme d'une gorge (7) dont le bord (8) se termine en pointe.
PCT/EP2013/054466 2013-03-06 2013-03-06 Transformateur électrique ou bobine de choc ainsi que structure bobinée comprenant une pièce d'écartement WO2014135205A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/054466 WO2014135205A1 (fr) 2013-03-06 2013-03-06 Transformateur électrique ou bobine de choc ainsi que structure bobinée comprenant une pièce d'écartement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/054466 WO2014135205A1 (fr) 2013-03-06 2013-03-06 Transformateur électrique ou bobine de choc ainsi que structure bobinée comprenant une pièce d'écartement

Publications (1)

Publication Number Publication Date
WO2014135205A1 true WO2014135205A1 (fr) 2014-09-12

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017208814A1 (de) 2017-05-24 2018-11-29 Isotek Gmbh Distanzband, Transformatorenwicklung und Transformator sowie das Verfahren zur Herstellung eines Distanzbandes
CN109903955A (zh) * 2017-12-08 2019-06-18 Zf 腓德烈斯哈芬股份公司 具有冷却装置的扼流圈
EP3901974A1 (fr) * 2020-04-20 2021-10-27 ABB Power Grids Switzerland AG Composant et procédé de fabrication de pièces d'espacement isolantes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092559B (de) * 1955-06-15 1960-11-10 Siemens Ag Metallischer Strahlungsring fuer Hochspannungswicklungen von Transformatoren
DE2401237A1 (de) 1973-12-19 1975-07-03 Bbc Brown Boveri & Cie Anordnung zur isolierung elektrischer komponenten, insbesondere bei transformatoren und drosselspulen
EP0037500A1 (fr) * 1980-03-21 1981-10-14 W. Meffert KG Carcasse pour enroulement électrique refroidi à l'air
DE4243090C1 (de) * 1992-12-18 1994-07-28 Siemens Ag Distanzelement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1092559B (de) * 1955-06-15 1960-11-10 Siemens Ag Metallischer Strahlungsring fuer Hochspannungswicklungen von Transformatoren
DE2401237A1 (de) 1973-12-19 1975-07-03 Bbc Brown Boveri & Cie Anordnung zur isolierung elektrischer komponenten, insbesondere bei transformatoren und drosselspulen
EP0037500A1 (fr) * 1980-03-21 1981-10-14 W. Meffert KG Carcasse pour enroulement électrique refroidi à l'air
DE4243090C1 (de) * 1992-12-18 1994-07-28 Siemens Ag Distanzelement

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017208814A1 (de) 2017-05-24 2018-11-29 Isotek Gmbh Distanzband, Transformatorenwicklung und Transformator sowie das Verfahren zur Herstellung eines Distanzbandes
CN109903955A (zh) * 2017-12-08 2019-06-18 Zf 腓德烈斯哈芬股份公司 具有冷却装置的扼流圈
EP3901974A1 (fr) * 2020-04-20 2021-10-27 ABB Power Grids Switzerland AG Composant et procédé de fabrication de pièces d'espacement isolantes
WO2021213707A1 (fr) * 2020-04-20 2021-10-28 Abb Power Grids Switzerland Ag Composant et procédé de fabrication d'espaceurs isolants
KR20220145930A (ko) * 2020-04-20 2022-10-31 히타치 에너지 스위처랜드 아게 절연 스페이서들을 제조하는 부품 및 방법
CN115668417A (zh) * 2020-04-20 2023-01-31 日立能源瑞士股份公司 用于制造绝缘间隔件的部件和方法
KR102530721B1 (ko) 2020-04-20 2023-05-09 히타치 에너지 스위처랜드 아게 절연 스페이서들을 제조하는 부품 및 방법
CN115668417B (zh) * 2020-04-20 2024-02-09 日立能源有限公司 用于制造绝缘间隔件的部件和方法

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