EP2624259B1 - Traversée pour un système d'alimentation et système comportant une telle traversée - Google Patents

Traversée pour un système d'alimentation et système comportant une telle traversée Download PDF

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Publication number
EP2624259B1
EP2624259B1 EP12153843.3A EP12153843A EP2624259B1 EP 2624259 B1 EP2624259 B1 EP 2624259B1 EP 12153843 A EP12153843 A EP 12153843A EP 2624259 B1 EP2624259 B1 EP 2624259B1
Authority
EP
European Patent Office
Prior art keywords
bushing
end portion
conductive layer
tapering end
edge
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
EP12153843.3A
Other languages
German (de)
English (en)
Other versions
EP2624259B8 (fr
EP2624259A1 (fr
Inventor
David Emilsson
Erik Wedin
Peter ÅSTRAND
Joachim Schiessling
Olof Hjortstam
Jonas Birgerson
Mats Berglund
Nils Lavesson
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 Schweiz AG
Original Assignee
ABB Research Ltd Switzerland
ABB Research Ltd Sweden
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 ABB Research Ltd Switzerland, ABB Research Ltd Sweden filed Critical ABB Research Ltd Switzerland
Priority to EP12153843.3A priority Critical patent/EP2624259B8/fr
Priority to CN201380007796.7A priority patent/CN104081474B/zh
Priority to BR112014018758-4A priority patent/BR112014018758B1/pt
Priority to PCT/EP2013/051850 priority patent/WO2013113783A1/fr
Publication of EP2624259A1 publication Critical patent/EP2624259A1/fr
Application granted granted Critical
Publication of EP2624259B1 publication Critical patent/EP2624259B1/fr
Publication of EP2624259B8 publication Critical patent/EP2624259B8/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/26—Lead-in insulators; Lead-through insulators
    • H01B17/28—Capacitor type
    • 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
    • H01F27/04—Leading of conductors or axles through casings, e.g. for tap-changing arrangements

Definitions

  • the present disclosure generally relates to insulation in power systems and in particular to a bushing and a system comprising such a bushing.
  • a bushing is an insulating structure used for leading an electrical conductor with a first electric potential through a surface or wall, such as a turret wall of a high voltage direct current (HVDC) transformer or an HVDC reactor, with a second electric potential.
  • HVDC high voltage direct current
  • a bushing should be designed taking both DC components and AC components into account.
  • the oil side of the bushing where the electrical conductor in the bushing typically is interconnected with an electrical conductor of the electrical equipment, for instance the converter side windings of a transformer, is subjected to high electrical stress created by AC voltages, steady state DC voltages, and transient phenomenon.
  • an insulation structure surrounding the oil side of the bushing is needed in the turret, the transformer tank or reactor tank.
  • the insulation structure may be large and complex.
  • US1955305 discloses a bushing which comprises a plurality of concentrically arranged dielectric cylinders and conductive cylinders.
  • the surfaces of the steps defined by a staircase formation of the cylinders define the external surface of the condenser core.
  • the “steps" of this staircase have varying length, and thus the profile of the condenser core can be approximated by a non-linear curve.
  • GB290651 discloses a terminal structure for a high tension electric apparatus comprising a condenser bushing.
  • US3394455 discloses a method of constructing cast, condenser type electrical bushings.
  • a general object of the present disclosure is to provide a bushing with increased electrical withstand strength.
  • Another object is to provide a system comprising an inductive device and a bushing, for which inductive device the requirements on its insulation structure may be set lower than for a corresponding existing system.
  • a bushing comprising a condenser core arranged to house an electrical conductor along a central axis of the condenser core, wherein the condenser core has a tapering end portion arranged to be in contact with a fluid dielectric having higher dielectric withstand strength than air, the tapering end portion presenting a surface having a first portion with a first inclination in the axial direction and a second portion with a second inclination in the axial direction, which second inclination differs from the first inclination, wherein the first portion and the second portion define planes that intersect the central axis, wherein the tapering end portion of the condenser core comprises conductive layers concentrically arranged around the central axis, wherein the conductive layers are arranged in a stair-like formation axially, with an innermost conductive layer having an edge defining the first step and the outermost conductive layer having an edge defining the last step, and each conductive layer
  • the distance from the bushing boundary to interior components of the bushing is controlled along said end portion.
  • the creep stress or tangential stress along the tapering end portion can be controlled.
  • Controlling the creep stress along the tapering end portion is beneficial for the performance of the turret and bushing insulation of e.g. an inductive device such as a transformer which can be used with the bushing, and the shape of the end portion can increase the dielectric withstand strength and reduce the amount, complexity and cost of the turret insulation structure.
  • the bushing Due to the tangent between the edge of the innermost conductive layer and the edge of the outermost conductive layer not being tangential to at least one edge of a conductive layer arranged between the innermost conductive layer and the outermost conductive layer, two degrees of freedom can be used when designing the bushing, i.e. the curvature of the tapering end portion and the axial curvature provided by the edges of the conductive layers.
  • the axial curvature of the conductive layers can be designed to provide an advantageous axial voltage distribution and the axial curvature of the tapering end portion provides the distance between the conductive layer and said end portion, whereby optimal bushing designs may be provided by combining the above mentioned design parameters.
  • the first portion and the second portion form a concave region of the tapering dielectric fluid medium side end portion.
  • the concave region is at least 20% of the length of the tapering dielectric fluid medium side end portion.
  • the edges of at least some of the conductive layers define a locally concave profile of the conductive layers.
  • a locally concave profile is herein meant that a curvature defined by the edges of at least some of the conductive layers is concave, wherein the profile of all of the conductive layers may have a more complex shape than concave.
  • the tapering end portion is an oil side end portion of the bushing.
  • the surface of the tapering end portion is an external surface of the bushing.
  • the surface of the tapering end portion comprises cellulose material.
  • the tapering end portion is rotationally symmetric.
  • the bushing is an HVDC bushing.
  • the bushing may advantageously be used with an inductive device.
  • a system comprising an inductive device and a bushing according to the first aspect presented herein, wherein the bushing may be arranged in an opening of the housing of the inductive device.
  • the inductive device is an HVDC transformer.
  • the inductive device is an HVDC reactor.
  • Fig. 1 depicts a schematic side view of a bushing 1.
  • the bushing 1 is an electrical insulator for insulating an electrical conductor which is to be lead through a surface, such as a wall, having a different electric potential than the electrical conductor.
  • the bushing 1 has a condenser core 3.
  • the condenser core 3 is arranged to house an electrical conductor along a central axis X of the condenser core 3.
  • Conductive layers C are arranged concentrically around the central axis X, and housed in the condenser core 3.
  • the condenser core 3 has a surface 3a acting as an external surface or cover of the conductive layers 6.
  • the bushing 1 has a first portion 3-1, a second portion 3-2, and a mounting flange 3-3 separating the first portion 3-1 from the second portion 3-2 of the bushing 1.
  • the first portion 3-1, the flange 3-2 and the second portion 3-2 defines the total axial length of the bushing 1.
  • the first portion 3-1 is arranged for extension in a first type of medium
  • the second portion 3-2 is arranged to for extension in a second type of medium.
  • the first type of medium and the second type of medium may be the same medium or they may be different media.
  • the first medium may for instance be oil, an insulating gas such as SF 6 , or air, depending on the bushing type and application.
  • the second medium may be any dielectric fluid having a dielectric withstand strength that is higher than the dielectric withstand strength of air. Such medium may for instance be transformer oil or SF 6 .
  • the bushing 1 may be an air-to-oil bushing, wherein the first type of medium is air, and the second type of medium is oil.
  • the bushing 1 may be an oil-to-oil bushing, wherein both the first type of medium and the second type of medium is oil.
  • the bushing 1 may be an insulating gas-to -oil bushing, wherein the first type of medium is an insulating gas such as SF 6 , and the second type of medium is oil.
  • At least one of the first portion 3-1 and the second portion 3-2 has a tapering end portion.
  • the tapering end portion 3-2a of the second portion 3-2 is described, it is to be noted that this design could be applied to the first end portion as well, if the external surface of the first end portion is arranged to be in contact with a dielectric fluid having higher dielectric withstand than air.
  • dielectric fluids can for example be oil or an insulating gas such as SF 6 .
  • Fig. 2a shows a portion of a schematic cross-sectional side view of the second portion 3-2.
  • the second portion 3-2 is arranged to be in contact with a dielectric fluid with greater dielectric withstand strength than air. Since the second portion 3-2, and thus also the tapering end portion 3-2a, is arranged to be in contact with a dielectric fluid with greater dielectric withstand than air, the design of the second portion differs from the design of an air side bushing portion.
  • the tapering end portion 3-2a has a first portion 4-1 with a first inclination 1-2 in the axial direction and a second portion 4-2 with a second inclination 1-2 in the axial direction.
  • the second inclination 1-2 differs from the first inclination 1-1.
  • the tapering end portion 3-2a changes inclination in the axial direction.
  • the first portion 4-1 and the second portion 4-2 define planes that intersect the central axis X.
  • the inclination of both the first portion 4-1 and the second portion 4-2 define planes that are non-parallel with the central axis X.
  • the tapering end portion 3-2a has a non-conical profile.
  • the first portion 4-1 is adjacent the second portion 4-2 in the axial direction.
  • the region where the first portion 4-1 joins the second portion 4-2 is curved in towards the interior of the condenser core 3.
  • the first portion 4-1 and the second portion 4-2 form a concave region 5-1.
  • the concave region 5-1 is at least 20% of the length of the tapering end portion 3-2a.
  • the first inclination and the second inclination may define a convex profile of the dielectric fluid medium side end portion. It is to be noted that other profile shapes of the tapering dielectric fluid medium side end portion are also envisaged. Moreover, embodiments with more than one inclination change in the axial direction are also contemplated.
  • the axial location where the first portion 4-1 joins the second portion 4-2 may be selected depending on the particular application. Such selection may for instance be based on computer simulations of the resistive voltage distribution on the condenser core for that application for different inclinations and different axial locations of where the first portion 4-1 joins the second portion 4-2. The selection of inclination values and location where the first portion 4-1 joins the second portion 4-2 is determined based on the most advantageous resistive voltage distribution for that application.
  • the surface 3a of the condenser core 3 may be machined during manufacturing so as to provide the first portion 4-1 with the first inclination 1-1 and the second portion 4-2 with the second inclination 1-2.
  • the condenser core 3 may for instance comprise a cellulose material such as paper.
  • the condenser core 3 comprises conductive layers C-1, C-2, C-3, C-4 concentrically arranged around the central axis X.
  • the conductive layers C-1, C-2, C-3, C-4 may for instance be metal foils.
  • the conductive layers are arranged in a stair-like formation axially, with an innermost conductive layer C-1 having an edge E-1 defining the first step and the outermost conductive layer C-4 having an edge E-4 defining the last step.
  • Each conductive layer C-2, C-3 between the innermost conductive layer C-1 and the outermost conductive layer C-4 has an edge E-2, E-3 defining at least part of an intermediate step.
  • each intermediate conductive layer C-2, C-3 either defines an intermediate step by itself, or forms an intermediate step together with one or more adjacent conductive layers, if several adjacent conductive layers have edges at the same axial position.
  • the radial distance ⁇ r(x) between the edges of the conductive layers and the surface 3a of the condenser core 3 varies in the axial direction X in the tapering end portion 3-2a of the bushing 1.
  • variations of the bushing where the radial distance is constant i.e. when the edges of the conductive core follow the profile of the condenser core and thus are located at the same or essentially the same radial distance from the surface of the tapered end portion are not envisaged by the present invention.
  • the distance between the edges and the surface of the condenser core can be controlled.
  • two degrees of freedom can be obtained for the bushing design, increasing the possibility of creating a bushing design with good creep stress characteristics.
  • the tangent T between the edge E-1 of the innermost conductive layer C-1 and the edge E-4 of the outermost conductive layer C-4 is not tangential to at least one edge of a conductive layer C-2, C-3 arranged between the innermost conductive layer C-1 and the outermost conductive layer C-4.
  • the edges of the conductive layers C-1, C-2, C-3, C-4 can define a concave profile P of the stair-like formation of the conductive layers C-1, C-2, C-3, C-4.
  • Fig. 3c shows an another example of a bushing 1 for which the tapering end portion 3-2a has a third portion 4-3 with a third inclination 1-3 which differs from the first inclination 1-1.
  • the third portion 4-3 defines a plane that intersects the central axis X.
  • the first portion 4-1 and the third portion 4-3 form a convex region 5-2 of the tapering end portion 3-2a.
  • first portion 4-1, the second portion 4-2 and the third portion 4-3 have a total length corresponding to at least 20% of the tapering end portion 3-2a.
  • shape of the tapering end portion include a continuous curve shape, i.e. a smooth curve, which locally may be concave or convex.
  • a first and/or second portion of the tapering end portion can be an arbitrarily short portion for which its inclination is constant.
  • the surface 3a of the tapering end portion 3-2a may either be an external surface of the bushing 1, or it may be covered by an insulating bushing cover, for instance made of porcelain or a composite material. In those cases when the tapering end portion is covered by an insulating bushing cover, dielectric fluid is provided between the surface of the condenser core and the insulating bushing cover.
  • the tapering end portion 3-2a may be rotationally symmetric with respect to the central axis X.
  • Fig. 4 shows a schematic view of a system comprising an inductive device 10 and bushing 1.
  • the inductive device 10 has a turret with an opening in which the bushing 1 is arranged.
  • the bushing 1 has an electrical conductor 15 extending along the central axis X through the bushing 1.
  • the electrical conductor is interconnected with an inductive arrangement, such as windings, in the interior 14 of the inductive device 10.
  • the interior 14 may be filled with a dielectric medium such as insulating oil for protecting and cooling the inductive device 10.
  • the inductive device 10 can for instance be an HVDC transformer, wherein the bushing 1 may be a converter side bushing or a line side bushing of the HVDC transformer, or an HVDC reactor.
  • the bushing presented herein can beneficially be used for medium voltage and high voltage applications in power distribution or power transmission applications.
  • the bushing may be used in direct current systems or alternating current systems.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulators (AREA)
  • Insulating Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Claims (12)

  1. Traversée (1) comprenant un noyau de condenseur agencée pour recevoir un conducteur électrique (15) le long d'un axe central (X) du noyau de condenseur (3), dans lequel le noyau de condenseur (3) présente une partie d'extrémité effilée (3-2a) agencée pour être en contact avec un diélectrique fluide ayant une résistance diélectrique supérieure à celle de l'air, la partie d'extrémité effilée (3-2a) présentant une surface (3a) comportant une première partie (4-1) avec une première inclinaison (I-1) dans le sens axial et une seconde partie (4-2) avec une seconde inclinaison (I-2) dans le sens axial, laquelle seconde inclinaison (I-2) est différente de la première inclinaison (I-1), dans laquelle la première partie (4-1) et la seconde partie (4-2) définissent des plans qui intersectent l'axe central (X)
    dans laquelle la partie d'extrémité effilée (3-2a) du noyau de condenseur comprend des couches conductrices (C-1, C-2, C-3, C4) disposées de manière concentrique autour de l'axe central (X), dans laquelle les couches conductrices (C-1, C-2, C-3, C4) sont disposées axialement dans une formation en escalier, avec une couche conductrice la plus interne (C-1) présentant un bord (E-1) définissant la première marche et la couche conductrice la plus externe (C-4) présentant un bord (E-4) définissant la dernière marche, et chaque couche conductrice (C-2, C-3) entre la couche conductrice la plus interne (C-1) et la couche conductrice la plus externe (C4) présentant un bord (E-2, E-3) définissant au moins une partie d'une marche intermédiaire,
    dans laquelle la surface (3a) fait office de surface externe ou de couvercle des couches conductrices, et dans laquelle la distance radiale r(x) entre les bords des couches conductrices et la surface (3a) du noyau de condenseur (3) varie dans le sens axial dans la partie d'extrémité effilée (3-2a) de la traversée (1),
    dans laquelle la tangente entre le bord (E-1) de la couche conductrice la plus interne (C-1) et le bord (E-4) de la couche conductrice la plus externe (C-4) n'est pas tangentiel à au moins un bord (E-2, E-3) d'une couche conductrice (C-2, C-3) disposée entre la couche conductrice la plus interne (C-1) et la couche conductrice la plus externe (C-2).
  2. Traversée (1) selon la revendication 1, dans laquelle la première partie (4-1) et la seconde partie (4-2) forment une région concave de la partie d'extrémité effilée (3-2a).
  3. Traversée (1) selon la revendication 2, dans laquelle la région concave est au moins 20% de la longueur de la partie d'extrémité effilée (3-2a).
  4. Traversée (1) selon l'une quelconque des revendications précédentes, dans laquelle les bords (E-2, E-3) d'au moins certaines des couches conductrices (C-2, C-3) définissent un profil localement concave des couches conductrices.
  5. Traversée selon l'une quelconque des revendications précédentes dans laquelle la partie d'extrémité effilée (3-2a) est une partie d'extrémité côté huile de la traversée.
  6. Traversée (1) selon l'une quelconque des revendications précédentes, dans laquelle la surface de la partie d'extrémité effilée (3-2a) est une surface externe de la traversée.
  7. Traversée (1) selon l'une quelconque des revendications précédentes, dans laquelle le noyau de condenseur (3) comprend un matériau de cellulose.
  8. Traversée (1) selon l'une quelconque des revendications précédentes, dans laquelle la partie d'extrémité effilée (3-2a) est rotationnellement symétrique.
  9. Traversée (1) selon l'une quelconque des revendications précédentes, dans laquelle la traversée (1) est une traversée HVDC.
  10. Système comprenant un dispositif inducteur (10) présentant une ouverture et une traversée (1) selon l'une quelconque des revendications 1 à 9 destinée à être disposée dans l'ouverture du dispositif inducteur (10).
  11. Système selon la revendication 10, dans lequel le dispositif inducteur (10) est un transformateur HVDC.
  12. Système selon la revendication 10, dans lequel le dispositif inducteur (10) est un réacteur HVDC.
EP12153843.3A 2012-02-03 2012-02-03 Traversée pour un système d'alimentation et système comportant une telle traversée Active EP2624259B8 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP12153843.3A EP2624259B8 (fr) 2012-02-03 2012-02-03 Traversée pour un système d'alimentation et système comportant une telle traversée
CN201380007796.7A CN104081474B (zh) 2012-02-03 2013-01-31 用于电力系统的套管和包括该套管的系统
BR112014018758-4A BR112014018758B1 (pt) 2012-02-03 2013-01-31 Bucha compreendendo um núcleo condensador disposto para alojar um condutor elétrico e sistema compreendendo um dispositivo de indução
PCT/EP2013/051850 WO2013113783A1 (fr) 2012-02-03 2013-01-31 Traversée conçue pour un système de puissance et système comprenant une telle traversée

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12153843.3A EP2624259B8 (fr) 2012-02-03 2012-02-03 Traversée pour un système d'alimentation et système comportant une telle traversée

Publications (3)

Publication Number Publication Date
EP2624259A1 EP2624259A1 (fr) 2013-08-07
EP2624259B1 true EP2624259B1 (fr) 2019-07-17
EP2624259B8 EP2624259B8 (fr) 2019-09-11

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Application Number Title Priority Date Filing Date
EP12153843.3A Active EP2624259B8 (fr) 2012-02-03 2012-02-03 Traversée pour un système d'alimentation et système comportant une telle traversée

Country Status (4)

Country Link
EP (1) EP2624259B8 (fr)
CN (1) CN104081474B (fr)
BR (1) BR112014018758B1 (fr)
WO (1) WO2013113783A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB290651A (en) * 1927-05-19 1929-04-25 Ass Elect Ind Improvements in or relating to high voltage insulators
US3394455A (en) * 1967-03-17 1968-07-30 Westinghouse Electric Corp Method of constructing cast electrical bushings

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1955305A (en) * 1931-12-04 1934-04-17 Albert J Maslin High voltage bushing
GB397033A (en) * 1932-03-19 1933-08-17 Westinghouse Electric & Mfg Co Improvements in or relating to electrically insulating bushings
US1955395A (en) 1932-12-16 1934-04-17 Lowell D Tueth Electric tire grooving device
GB646697A (en) * 1947-11-01 1950-11-29 Micafil Ltd Improvements in or relating to condenser type insulators
US2912480A (en) * 1955-09-19 1959-11-10 Gen Electric High voltage bushing
US5198622A (en) * 1989-10-13 1993-03-30 Asea Brown Boveri Ab Condenser body for the field control of the connection of a transformer bushing
CN101136268B (zh) * 2006-08-31 2012-02-08 Abb技术有限公司 高压dc套管以及包括该高压套管的设备
ES2524451T3 (es) * 2006-09-25 2014-12-09 Siemens Aktiengesellschaft Aislador pasante de transformador de alta corriente

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB290651A (en) * 1927-05-19 1929-04-25 Ass Elect Ind Improvements in or relating to high voltage insulators
US3394455A (en) * 1967-03-17 1968-07-30 Westinghouse Electric Corp Method of constructing cast electrical bushings

Also Published As

Publication number Publication date
EP2624259B8 (fr) 2019-09-11
BR112014018758A2 (fr) 2017-06-20
CN104081474B (zh) 2016-10-05
BR112014018758A8 (pt) 2017-07-11
BR112014018758B1 (pt) 2022-02-01
WO2013113783A1 (fr) 2013-08-08
CN104081474A (zh) 2014-10-01
EP2624259A1 (fr) 2013-08-07

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