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EP4115435B1 - Appareil électrique pourvu d'une cuve dotée d'une partie à bombement convexe - Google Patents

Appareil électrique pourvu d'une cuve dotée d'une partie à bombement convexe

Info

Publication number
EP4115435B1
EP4115435B1 EP21721848.6A EP21721848A EP4115435B1 EP 4115435 B1 EP4115435 B1 EP 4115435B1 EP 21721848 A EP21721848 A EP 21721848A EP 4115435 B1 EP4115435 B1 EP 4115435B1
Authority
EP
European Patent Office
Prior art keywords
winding
electrical device
barrier system
section
bulging portion
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
EP21721848.6A
Other languages
German (de)
English (en)
Other versions
EP4115435A1 (fr
EP4115435C0 (fr
Inventor
Jens Hoppe
Karsten LOPPACH
Christian Reichert
Thomas Wende
Bilen Özen
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.)
Siemens Energy Global GmbH and Co KG
Original Assignee
Siemens Energy Global GmbH and Co KG
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 Energy Global GmbH and Co KG filed Critical Siemens Energy Global GmbH and Co KG
Priority to EP25214168.4A priority Critical patent/EP4668298A2/fr
Publication of EP4115435A1 publication Critical patent/EP4115435A1/fr
Application granted granted Critical
Publication of EP4115435C0 publication Critical patent/EP4115435C0/fr
Publication of EP4115435B1 publication Critical patent/EP4115435B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • H01F27/02—Casings
    • 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
    • H01F27/321—Insulating of coils, windings, or parts thereof using a fluid for insulating purposes only
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields

Definitions

  • the invention relates to an electrical device for connection to a high-voltage network, comprising a vessel filled with insulating fluid, which has at least one side wall forming a flat wall section and a radially outwardly curved bulge section that increases the internal volume of the vessel and extends between two axial edges, an active part arranged in the vessel comprising a core and at least one winding enclosing a section of the core, and at least one winding barrier system enclosing one or more windings, wherein the bulge section is shaped to be complementary to a section of the winding barrier system and is located at a distance from it, wherein an additional barrier is arranged between the winding barrier system and the bulge section, which has a circular section facing the bulge section and bent radially outwards, and two flat planar sections, each extending from the circular section to a free end along an axial fold.
  • transformers have an active part that has a magnetizable core formed from iron sheets pressed together with their flat sides against each other.
  • the core forms a closed magnetic circuit.
  • the iron sheets are pressed together using a press frame.
  • the core forms, for example, three legs connected by a lower and upper yoke.
  • Each core leg is surrounded by an inner secondary winding and an outer primary winding.
  • the core and these windings are arranged concentrically.
  • a transformer with a barrier that has both a round section and flat sections is made of... JP S54 105731 A known.
  • the active component grows larger, while the required transport dimensions of the boiler often have to be kept constant. For this reason, the distance between the active component and the boiler decreases. However, depending on the required operating voltage, this distance must not fall below a minimum distance.
  • bulged boilers In which the boiler has side walls that form bulges. These bulges are located opposite the windings, so that the distance between the winding and the boiler wall does not fall below the required minimum distance.
  • bulged boilers have the disadvantage that high electric field strengths can develop due to the resulting corners at the transition between the bulged section and the flat section of the side wall.
  • the object of the invention is therefore to improve the reduction of the field in the edge area and thus avoid an electrical flashover.
  • the invention solves this problem by providing at least one adjuster that extends between the winding barrier system and the planar section of the additional barrier.
  • an additional barrier is arranged between the bulged section of the side wall to divide the free oil passage.
  • the additional barrier has a round section that, like the bulged section, is bent radially outwards.
  • two flat sections are provided, each extending in a plane, so that a sharp bend, a fold, or in other words, a rebate extending axially is formed between each flat section and the round section.
  • This rebate extends axially The direction is different, whereas the circular section, like the bulged section of the side wall, is curved radially outwards and thus rounded.
  • the two flat sections of the additional barrier extend from the circular section to their free end.
  • an additional barrier designed according to the invention advantageously divides the free oil passage – particularly at the kinks in the side wall.
  • an electrical device is thus provided whose active part can be designed for higher power outputs, i.e., higher voltages or higher currents, without having to deviate from the required transport dimensions.
  • the spacer which can also be referred to as a standoff, is also made of pressed wood, cardboard or paper and serves to align the respective plan section of the additional barrier, whose free end could otherwise align freely.
  • the electrical device according to the invention is, for example, a transformer or an inductor. If the electrical device is a transformer, it has one or more pairs of inductively coupled windings.
  • the two windings of a winding pair are, for example, arranged concentrically to each other, with one winding being a low-voltage winding and the other a high-voltage winding.
  • a core leg extends through both windings as a core section.
  • the winding barrier system is advantageously formed from a series of barriers separated by oil channels, resulting in improved radial field attenuation. These barriers are made of pressed wood. However, such barrier systems are already known to those skilled in the art, so a detailed description of the exact construction of such a barrier system is omitted here.
  • the barrier system preferably has a circular cylindrical outer contour.
  • An additional barrier extends between this barrier system and the main barrier. This additional barrier is advantageously made of an electrically non-conductive material, such as particleboard. Alternatively, the additional barrier can also be made of paper or cardboard.
  • the round section is shaped to be complementary to the bulged section. According to this advantageous further development of the invention, the round section maintains a constant distance from the rounded, outwardly curved bulged section.
  • planar sections extend parallel to the flat section of the side wall.
  • the electric field is further subdivided at the edges of the side wall.
  • the additional barrier is held by at least one hinged segment arranged at a distance from the winding barrier system and by a retaining band also spaced at a distance from the winding barrier system and the bulged section.
  • the additional barrier is held in place by a retaining band and cap segments.
  • the cap segments which are generally already installed in the boiler, are used to hold the additional barrier.
  • the retaining band which is designed, for example, as a flat band, extends around the additional barrier system so that, for example, its flat side rests against its outer contour. From there, it is wound around the rounded section of the additional barrier system, with suitable openings or slots provided in the additional barrier.
  • the retaining band is made, for example, of cardboard, paper, or another malleable pressed wood product.
  • the tensioner is conveniently attached to the winding barrier system via the retaining strap.
  • Cords made of cardboard, paper, or another non-conductive material are used to attach it to the respective plan section, for example, to the free end of each plan section.
  • the tensioner has suitable openings for this purpose.
  • Each tensioner is provided with slots through which the retaining strap can be threaded.
  • the winding barrier system has a circular cylindrical outer contour, and the bulge section defines a portion of a circular hollow cylinder, with the winding barrier system and the bulge section being arranged concentrically to each other.
  • the windings are cylindrical and arranged concentrically to each other and to the core leg they surround. According to this further development of the invention, this also applies to the winding barrier system, which, due to its complementary shape, then also affects the bulge section. This section is then a segment or portion of a circular cylinder.
  • the bulged section and the rounded section each define a section of a hollow cylinder, wherein the hollow cylinders have different radii and the bulged section and the rounded section are arranged concentrically to each other.
  • the bulged section and the winding barrier system also applies to the rounded section and the bulged section.
  • the two edges of the side wall, between which the bulged section extends, and the two folds of the additional barrier, between which the rounded section extends form the same angle with respect to a common center point.
  • Figure 1 shows an embodiment of an electrical device 1 according to the prior art in a sectional view from above.
  • the electrical device 1 shown is designed as a power transformer 1, which has a vessel filled with an insulating fluid, of which only one side wall 2 is visible.
  • the side wall 2 has a flat wall section 3 and a radially outwardly convex section 4 that extends into the inner volume of the vessel.
  • the convex section is arranged between two axial edges 5 and 6 extending in an axial direction. The axial direction extends in Figure 4 into the drawing plane or comes out of the drawing plane.
  • a high-voltage winding 7 and a low-voltage winding 8 are arranged concentrically to each other. and are arranged around a core leg that is not depicted in a figure.
  • the bulged section 4 is convex, increasing the internal volume of the tank, so that a required minimum distance is maintained between the high-voltage winding 7 and the side wall 2, thus preventing high electric field strengths and voltage flashovers inside the transformer 1.
  • high electric field strengths can occur at the edges shown as corners in the sectional view, so that the operating voltage of the power transformer cannot be increased further without voltage flashovers occurring at these corners or bends, which would irreparably damage the electrical device.
  • Figure 2 shows an embodiment of the electrical device 9 according to the invention, which is again designed as a transformer 9.
  • the transformer 9, only partially shown in a sectional top view, has a tank or boiler from which the Figure 2 Only one side wall 2 is shown, which again has a flat wall section 3 and a radially outwardly curved bulge section 4.
  • the bulge section 4 extends between axially extending edges 5 and 6, which are in Figure 2 due to the chosen cropped representation, corners 5 and 6 are clearly indicated.
  • Transformer 9 is filled with an insulating fluid, for example a mineral oil or an ester liquid. Inside it is a magnetizable core, from which in Figure 2 Only one core leg 10 is recognizable.
  • the core leg 10 is concentrically enclosed by a low-voltage winding 8 and a high-voltage winding 7.
  • the two windings 7 and 8 are in turn surrounded by a barrier system 11, which consists of individual radially spaced barriers 12. Between the Barriers 12 of the barrier system 11 are formed with oil channels that increase the electrical strength of the transformer 9.
  • an additional barrier 13 is discernible, which has a circular section 14 facing the bulged section 4, from which two flat sections 15 and 16 extend towards a free end.
  • the circular section 14 is form-complementary to the circular cylindrical outer contour of the winding barrier system 11 and form-complementary to the bulged section 4 of the side wall 2.
  • the flat sections 15 and 16 extend essentially parallel to the flat wall sections 3 of the side wall 2. In other words, the flat sections 15 and 16 extend from the axial folds 17 and 18, which are located in Figure 2 due to the two-dimensional representation, they are again depicted as corners.
  • the circular section 14 transitions into one of the planar sections 15 and 16 at the aforementioned axial folds 17 and 18.
  • the additional barrier 13 is formed in one piece. In the illustrated embodiment, it consists of pressed wood, like the barriers 12 of the winding barrier system 11.
  • the additional barrier can be made of cardboard, paper, or even an electrically non-conductive plastic.
  • Figure 3 shows the attachment of the additional barrier 13 in more detail. It can be seen that it is held at a distance from the outer barrier 12 of the winding barrier system 11 by means of cap segments 19.
  • the cap segments 19, which are also rounded, are L-shaped in a longitudinal section view and are clamped at their shorter base end by a lower fastening system 20.
  • the fastening system 20 also serves to attach the barriers 12 of the winding barrier system 11 and is located here on the bottom of the tank. Longitudinal slots are formed between two adjacent cap segments 19, through which a plan section 16 of the additional barrier 13 extends.
  • a retaining band 21 is provided, which is made of cardboard and designed as a flat band.
  • the retaining band rests with its flat side against the outer contour of the winding barrier system 11 and is guided from there through a slot 22 in the round section 14 of the additional barrier 13, so that the retaining band 21 surrounds the round section from the outside and thus provides additional support for the additional barrier 13.
  • a spacer or adjuster 22 is visible, which has an angled foot section 23 that rests against the outer contour of the winding barrier system 11.
  • the retaining strap is guided over the foot section, so that the retaining strap 21 presses the foot section 23 against the winding barrier system 11.
  • An adjuster slot 24 is formed in the lower area of the adjuster 22, through which the retaining strap 21 is guided.
  • the fastening cord can also be made of another electrically non-conductive material.
  • the adjuster 22 is dimensionally stable, ensuring a firm and stable alignment of the planar sections 16 with the flat wall sections.
  • FIG. 4 The illustration shows the attachment of the cap segments 19 to the fastening system 20.
  • the L-shaped design of the cap segments 19 is visible in longitudinal section.
  • the inner barriers 12 of the winding barrier system 11 are recognizable due to a partially transparent representation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Coils Of Transformers For General Uses (AREA)

Claims (9)

  1. Appareil électrique (9) pour le raccordement à un réseau haute tension avec
    - un réservoir rempli de fluide isolant, qui comporte au moins une paroi latérale (2) qui forme une section de paroi plane (3) et une section de renflement incurvée radialement vers l'extérieur (4) qui augmente le volume interne du réservoir et s'étend entre deux bords axiaux (5, 6),
    - une partie active disposée dans le réservoir, qui comporte un noyau (10) et au moins un enroulement (7, 8) enfermant une section du noyau (10), et
    - au moins un système de barrière d'enroulement (11) entourant un ou plusieurs enroulements (7, 8),
    la section de renflement (4) étant de forme complémentaire à une section du système de barrière d'enroulement (11) et étant située à distance de celle-ci, une barrière supplémentaire (13) étant disposée entre le système de barrière d'enroulement (11) et la section de renflement (4), laquelle barrière supplémentaire comporte une section ronde (14) tournée vers la section renflée (4) et courbée radialement vers l'extérieur et deux sections plates (15, 16) qui s'étendent chacune au niveau d'un pli axial (17, 18) de la section ronde (14) jusqu'à une extrémité libre, caractérisé en ce qu'il est prévu au moins un actionneur (22) qui s'étend entre le système de barrière d'enroulement (11) et la section plate (15, 16) de la barrière supplémentaire (13).
  2. Appareil électrique (9) selon la revendication 1, caractérisé en ce que la section ronde (14) est conçue de manière à être complémentaire en forme à la section de renflement (4).
  3. Appareil électrique (9) selon la revendication 1 ou 2,
    caractérisé en ce que les sections plates (15, 16) s'étendent chacune parallèlement à la section de paroi plate de la paroi latérale.
  4. Appareil électrique (9) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la barrière supplémentaire (13) est maintenue au moyen d'au moins un segment de capuchon (19) disposé à distance du système de barrière d'enroulement (11) et au moyen d'une bande de maintien (21) disposée à distance du système de barrière d'enroulement (11) et de la section de renflement (4).
  5. Appareil électrique (9) selon la revendication 4,
    caractérisé en ce que chaque actionneur (22) est fixé au système de barrière d'enroulement (11) au moyen de la bande de maintien (21).
  6. Appareil électrique (9) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que chaque actionneur (22) est fixé à la section plane respective (16, 16) au moyen d'un cordon de fixation (25).
  7. Appareil électrique (9) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que le système de barrière d'enroulement (11) présente un contour extérieur cylindrique circulaire et la section de renflement (4) délimite une section d'un cylindre creux circulaire, le système de barrière d'enroulement (11) et la section de renflement (4) étant disposés concentriquement l'un par rapport à l'autre.
  8. Appareil électrique (9) selon l'une quelconque des revendications précédentes,
    caractérisé en ce que la section de renflement (4) et la section ronde (14) délimitent chacune une section d'un cylindre creux, les cylindres creux ayant des rayons différents et la section de renflement (4) et la section ronde (14) étant disposées concentriquement l'une par rapport à l'autre.
  9. Appareil électrique (9) selon la revendication 8,
    caractérisé en ce que dans une vue en plan les deux bords (5, 6) de la paroi latérale (2) et les deux plis (17, 18) de la barrière supplémentaire (13) forment le même angle par rapport au point central commun.
EP21721848.6A 2020-04-14 2021-04-09 Appareil électrique pourvu d'une cuve dotée d'une partie à bombement convexe Active EP4115435B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP25214168.4A EP4668298A2 (fr) 2020-04-14 2021-04-09 Appareil électrique avec chaudière à bulles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020204661.1A DE102020204661A1 (de) 2020-04-14 2020-04-14 1Elektrisches Gerät mit Beulenkessel
PCT/EP2021/059251 WO2021209325A1 (fr) 2020-04-14 2021-04-09 Appareil électrique pourvu d'une cuve dotée d'une partie à bombement convexe

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP25214168.4A Division EP4668298A2 (fr) 2020-04-14 2021-04-09 Appareil électrique avec chaudière à bulles

Publications (3)

Publication Number Publication Date
EP4115435A1 EP4115435A1 (fr) 2023-01-11
EP4115435C0 EP4115435C0 (fr) 2025-11-12
EP4115435B1 true EP4115435B1 (fr) 2025-11-12

Family

ID=75690247

Family Applications (2)

Application Number Title Priority Date Filing Date
EP25214168.4A Pending EP4668298A2 (fr) 2020-04-14 2021-04-09 Appareil électrique avec chaudière à bulles
EP21721848.6A Active EP4115435B1 (fr) 2020-04-14 2021-04-09 Appareil électrique pourvu d'une cuve dotée d'une partie à bombement convexe

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP25214168.4A Pending EP4668298A2 (fr) 2020-04-14 2021-04-09 Appareil électrique avec chaudière à bulles

Country Status (5)

Country Link
US (1) US20230326649A1 (fr)
EP (2) EP4668298A2 (fr)
CN (1) CN115380341B (fr)
DE (1) DE102020204661A1 (fr)
WO (1) WO2021209325A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4492412A1 (fr) * 2023-07-13 2025-01-15 Hitachi Energy Ltd Transformateur

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54105731A (en) * 1978-02-08 1979-08-20 Toshiba Corp Static induction machinry
JPH0935957A (ja) 1995-07-19 1997-02-07 Hitachi Ltd 電気機器
JP2001023831A (ja) * 1999-07-06 2001-01-26 Hitachi Ltd 静止誘導電器巻線
CN2814637Y (zh) * 2005-07-19 2006-09-06 福州天宇电气股份有限公司 电力变压器
ES2481871T5 (es) * 2010-06-28 2018-03-16 Abb Schweiz Ag Disposición de bobina y blindaje eléctrico, transformador incluyendo la disposición y un método de fabricar la disposición
CN202678031U (zh) * 2012-04-20 2013-01-16 中国西电电气股份有限公司 一种变压器升高座视察窗绝缘屏蔽装置
PL2866235T3 (pl) * 2013-10-22 2020-04-30 Abb Schweiz Ag Transformator wysokiego napięcia
ES2639111T3 (es) * 2013-10-29 2017-10-25 Abb Schweiz Ag Bobina de transformador seco y transformador seco
EP3076409B1 (fr) * 2015-03-30 2017-12-13 Siemens Aktiengesellschaft Connexion électrique d'enroulements écartés les uns des autres
EP3133615B1 (fr) 2015-08-20 2018-12-26 Siemens Aktiengesellschaft Systeme de bobine electrique
CN205828113U (zh) * 2016-07-26 2016-12-21 Abb瑞士股份有限公司 变压器
CN106783027B (zh) 2016-12-27 2018-04-10 中国科学院合肥物质科学研究院 一种隔离变压器
CN208706393U (zh) * 2018-10-24 2019-04-05 山东电力设备有限公司 一种三相有载变压器油箱
EP4200884A4 (fr) * 2020-09-09 2024-05-15 Siemens Energy Global GmbH & Co. KG Réservoir d'huile pour transformateur convertisseur et transformateur convertisseur comportant ce dernier

Also Published As

Publication number Publication date
DE102020204661A1 (de) 2021-10-14
EP4115435A1 (fr) 2023-01-11
EP4668298A2 (fr) 2025-12-24
CN115380341B (zh) 2025-10-14
CN115380341A (zh) 2022-11-22
EP4115435C0 (fr) 2025-11-12
US20230326649A1 (en) 2023-10-12
WO2021209325A1 (fr) 2021-10-21

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