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EP2767991B1 - Améliorations apportées ou relatives à des composants d'isolation pour transformateurs de convertisseur HVDC - Google Patents

Améliorations apportées ou relatives à des composants d'isolation pour transformateurs de convertisseur HVDC Download PDF

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Publication number
EP2767991B1
EP2767991B1 EP13275037.3A EP13275037A EP2767991B1 EP 2767991 B1 EP2767991 B1 EP 2767991B1 EP 13275037 A EP13275037 A EP 13275037A EP 2767991 B1 EP2767991 B1 EP 2767991B1
Authority
EP
European Patent Office
Prior art keywords
insulation
component
surface profile
sub
insulation component
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
EP13275037.3A
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German (de)
English (en)
Other versions
EP2767991A1 (fr
Inventor
Sean Barker
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.)
GE Vernova GmbH
Original Assignee
General Electric Technology GmbH
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Publication date
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Priority to EP13275037.3A priority Critical patent/EP2767991B1/fr
Publication of EP2767991A1 publication Critical patent/EP2767991A1/fr
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Publication of EP2767991B1 publication Critical patent/EP2767991B1/fr
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/125—Other insulating structures; Insulating between coil and core, between different winding sections, around the coil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
    • H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
    • 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

Definitions

  • This invention relates to an insulation component for a two limb high voltage direct current (HVDC) converter transformer, an insulation assembly including such an insulation component, and a method of manufacturing such an insulation component.
  • HVDC high voltage direct current
  • a typical single phase HVDC converter transformer 10 is illustrated schematically in Figure 1 .
  • the converter transformer 10 includes a magnetic core 12 which has first and second interconnected limbs 14, 16 around each of which is arranged a coil (not shown). Each limb 14, 16 and associated coil is surrounded by a corresponding insulation assembly 18, 20.
  • each coil has an electromagnetic field associated with it and the respective electromagnetic fields interact with one another in an interaction region 22 which lies between the coils.
  • Such interaction gives rise in use to a large electrical stress, i.e. a so-called “creep stress", on the outer surface 24 of each insulation assembly 18, 20 at the interaction region 22. Too high a creep stress can lead to tracking and subsequent failure of the corresponding insulation assembly 18, 20, which in turn means the associated transformer 10 will not meet one or more industry-standard acceptance criteria.
  • DE 603 240 discloses an insulation arrangement for transformers.
  • DE 631 809 discloses insulation for a high voltage transformer.
  • JP 59194409 discloses a pair of molded insulators for a high voltage transformer.
  • CH 167 281 discloses an insulator for a transformer.
  • US 2004/150498 discloses a polymer barrier insulation member.
  • an insulation component for a limb of an HVDC converter transformer, comprising a component body having first and second ends between which extends an inner surface that in use faces the magnetic core of a limb of a HVDC converter transformer and an outer surface which lies opposite the inner surface, the outer surface having a surface profile extending between the first and second ends which includes at least one raised formation.
  • an insulation component which has an outer surface with a surface profile extending between first and second ends thereof that includes at least one raised formation, results in the length of a path along the surface profile of such an insulation component being longer that the corresponding path along the surface profile of a conventional insulation component.
  • the provision of a longer surface profile path means that any electrical stress, i.e. creep stress, which arises on the outer surface of the said insulation component is distributed over a greater length of outer surface and so the overall creep stress experienced by the given length of outer surface is reduced.
  • achieving such a reduction by way of a modified insulation component obviates the need significantly to modify the structure of the associated insulation assembly or transformer as a whole, and so does not adversely impact on the running of electrical connections to each coil of the transformer.
  • the insulation component of the invention provides such a reduction in creep stress within the overall envelope of a comparable conventional insulation assembly, and so does not necessitate an increase in size of the transformer.
  • At least one raised formation has first and second parallel sides.
  • the inclusion of such first and second sides helps to provide a desired increase in length of the surface profile path for a given height of raised formation.
  • At least one raised formation has first and second sides which extend towards one another. Having first and second sides that extend towards one another similarly helps to provide a desired increase in length of the surface profile path for a given height of raised formation, while reducing the incidence of relatively sudden changes of direction in the surface profile which might otherwise lead to a concentration in creep stress.
  • first and second sides extend towards one another as they extend out of the component body. Such an arrangement helps to minimise creep stress concentrations in a manner that is readily manufacturable.
  • the at least one raised formation may have a third side extending between the first and second sides. Providing a third such side helps in maintaining the integrity of the or each raised formation during manufacture of the insulation component.
  • the third side lies parallel to the remainder of the surface profile of the outer surface.
  • Such an arrangement is readily manufacturable without the need, e.g. for specially modified tooling.
  • the surface profile extending between the first and second ends includes a plurality of raised formations.
  • the inclusion of a plurality of raised formations provides a further reduction in the overall creep stress experienced by a given length of outer surface of the insulation component, as may be required to meet a particular acceptance criteria, as well as permitting a tuning of the insulation characteristics of an associated insulation assembly to optimise its performance across a range of likely operating conditions.
  • the plurality of raised formations are each identical to one another. Such an arrangement simplifies manufacture of the insulation component, as well as helping it to provide a uniform reduction in creep stress during operation.
  • An insulation component according to a further preferred embodiment of the invention defines an insulation component segment cooperable with one or more other segments to form an insulation assembly.
  • Having the insulation component define such an insulation component segment allows for the tailoring of the insulation characteristics of an associated insulation assembly, e.g. in a manner whereby an insulation portion which is adept at reducing the creep stress it experiences can be positioned within a transformer structure only where high creep stress might otherwise arise, e.g. at or around an interaction region.
  • the insulation component segment may be cooperable with at least one other identical insulation component segment to define a low creep stress insulation region of an insulation assembly. Such functionality further assists in tailoring the insulation characteristics of an associated insulation assembly.
  • the insulation component segment includes an interlock element cooperable with an interlock element of an adjacent segment to secure the said segments to one another.
  • the inclusion of an interlock element ensures that the creep stress is reduced as required and the low creep stress insulation region is positioned as desired in the insulation assembly.
  • an insulation component for a HVDC converter transformer, comprising the steps of:
  • Such a method advantageously gives rise to the insulation component of the invention in a cost-effective and readily repeatable manner.
  • the step of forming at least one raised formation in the surface profile of the outer surface includes using a tool to mould the or each raised formation.
  • a tool helps to ensure that the resulting raised formation maintains its desired shape during subsequent processing of the insulation component.
  • moulding the or each raised formation occurs while at least the surface profile layer remains wet.
  • Such scheduling of the moulding step helps to ensure ready and accurate creation of the raised formation.
  • An insulation component according to a first embodiment of the invention is designated generally by the reference numeral 50.
  • the insulation component 50 includes a component body 52 that has a first end 54 and a second end 56.
  • An inner surface (not shown), which in use faces the magnetic core 12 of a limb 14, 16 of a converter transformer, extends between the first and second ends 54, 56.
  • An outer surface 58 lies opposite the inner surface and extends similarly between the first and second ends 54, 56.
  • the outer surface 58 has a surface profile 60 (along a path 62 which extends between the first and second ends 54, 56 and in use lies substantially parallel to a corresponding limb 14, 16) that includes six raised formations 64.
  • the surface profile 60 may be considered from the perspective of a path that lies at a different angle to an associated limb 14, 16.
  • the surface profile 60 in other embodiments of the invention may, irrespective of the angle relative to the associated limb 14, 16 at which it lies, include more than or fewer than six raised formations 64.
  • each raised formation 64 is identical and has first and second sides 66, 68 which extend towards one another, and more particularly extend towards one another as they extend out of the component body 52.
  • Each raised formation 64 also includes a third side 70 that extends between the first and second sides 66, 68, and additionally lies parallel to a remainder 72 of the surface profile 60.
  • each raised formation 64 has a finished height H of approximately 6mm and a finished width W of approximately 20mm. In other embodiments of the invention one or more recess formations may have a different height and/or a different width.
  • FIG. 4 shows a portion of an insulation component 80 according to a second embodiment of the invention.
  • the second insulation component 80 includes an outer surface 58 that has a surface profile 82 in which four raised formations 84 are formed.
  • Each raised formation 84 has first and second parallel sides 86, 88, as well as a third side 90 which is both parallel to the remainder 72 of the surface profile 82 and substantially perpendicular to each of the first and second sides 86, 88.
  • Each raised formation 84 similarly has a height H of approximately 6mm and a width W of approximately 20mm, although other dimensions are also possible.
  • Still further embodiments of the invention may have surface profiles that include one or more raised formations which differ in shape to those mentioned above, and indeed which differ in shape to one another within a given surface profile. All such further embodiments nevertheless have a surface profile which is greater in length than that of a conventional straight surface profile having no raised formations formed thereon.
  • each first insulation component 50 defines an insulation component segment 100 that cooperates with an identical adjacent insulation component segment 100 to define a low creep stress insulation region 102 of an insulation assembly 104 (only a portion of which is shown in Figure 2 ).
  • the or each insulation component segment 100 may also cooperate with one or more other insulation segments 106 that have a straight surface profile, i.e. a surface profile which has no raised formations formed therein, in order that together the various segments form an insulation assembly that completely encloses an associated limb and coil.
  • the insulation component may instead itself define an insulation assembly, e.g. the insulation component may define an annular ring which in use extends completely around an associated limb and coil.
  • the resulting insulation assembly also need not be annular, and instead may adopt any other shape capable of completely encompassing the associated limb and coil.
  • Each insulation component segment 100 includes an interlock element (not shown) that cooperates in use with the interlock element of an adjacent segment to secure the insulation component segment 100 and the adjacent segment to one another.
  • the interlock element may take the form of a mutually engageable interlock formation or member, or other mutually cooperable locking component.
  • the low creep stress insulation region 102 of the portion of insulation assembly 104 shown schematically in Figure 2 is positioned to lie in the interaction region 22 between the first and second limbs 14, 16 of a single phase HVDC converter transformer.
  • each insulation component segment 100 results in a longer surface profile path 74 which, in turn, distributes the electrical stress, i.e. creep stress, arising on the outer surface 58 of the insulation component segment 100 over a greater length of outer surface 58, such that the overall creep stress experienced by the given length of outer surface 58 is reduced.
  • electrical stress i.e. creep stress
  • Figure 5 illustrates schematically a method of manufacturing each of the insulation component segments 100 mentioned above.
  • FIG. 5 shows a component sub-body 110 formed from a malleable fibrous insulation material, such as paper or pressboard.
  • the component sub-body has first and second ends 54, 56 between which extends an inner surface 112 (that in use faces the magnetic core 12 of a limb 14, 16 of a HVDC converter transformer) and an outer sub-surface 114 which lies opposite the inner surface 112.
  • Figure 5 also illustrates a surface profile layer 116 of the malleable fibrous insulation material which has been applied to the outer sub-surface 114 of the component sub-body 110.
  • the surface profile layer 116 may also be applied to the first end 54 of the component sub-body 110.
  • the fibres of the component sub-body 110 and the surface profile layer 116 are interlinked with one another to define a homogenous component body 52 which has an outer surface 58 that lies opposite the aforementioned inner surface112, and which has a surface profile 60 that extends along a path 62 between the first and second ends 54, 56.
  • Figure 5 shows the formation of a first raised formation 64a on the surface profile 60 of the outer surface 58, and the intention subsequently to form second and third raised formations 64b, 64c in the same surface profile 60.
  • a tool is used to mould each raised formation 64 on the outer surface 58, and such moulding takes places while at least the surface profile layer 116 remains wet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulating Of Coils (AREA)

Claims (3)

  1. Procédé de fabrication d'un composant d'isolation, pour un transformateur de convertisseur HVDC (10), comprenant les étapes de :
    (a) formation d'un sous-corps de composant (110) à partir d'un matériau d'isolation fibreux malléable, le sous-corps de composant (110) ayant des première et seconde extrémités (54, 56) entre lesquelles s'étend une surface interne (112) qui en utilisation fait face au coeur magnétique d'un membre d'un transformateur de convertisseur HVDC et une sous-surface externe (114) qui se trouve à l'opposé de la surface interne ;
    (b) application d'une couche de profil de surface (116) de matériau isolant fibreux malléable sur la sous-surface externe (114), moyennant quoi les fibres du sous-corps de composant (110) et de la couche de profil de surface (116) s'entrelacent les unes avec les autres pour définir un corps de composant homogène ayant une surface externe qui se trouve à l'opposé de ladite surface interne et qui a un profil de surface s'étendant entre les première et seconde extrémités ; et
    (c) formation d'au moins une formation surélevée (64a) dans le profil de surface de la surface externe.
  2. Procédé de fabrication d'un composant d'isolation selon la revendication 1, dans lequel l'étape de formation d'au moins une formation surélevée (64a) dans le profil de surface (60) de la surface externe comporte l'utilisation d'un outil pour mouler la ou chaque formation surélevée.
  3. Procédé de fabrication d'un composant d'isolation selon la revendication 2, dans lequel le moulage de la ou de chaque formation surélevée (64a) se produit alors qu'au moins la couche de profil de surface reste humide.
EP13275037.3A 2013-02-19 2013-02-19 Améliorations apportées ou relatives à des composants d'isolation pour transformateurs de convertisseur HVDC Active EP2767991B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13275037.3A EP2767991B1 (fr) 2013-02-19 2013-02-19 Améliorations apportées ou relatives à des composants d'isolation pour transformateurs de convertisseur HVDC

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13275037.3A EP2767991B1 (fr) 2013-02-19 2013-02-19 Améliorations apportées ou relatives à des composants d'isolation pour transformateurs de convertisseur HVDC

Publications (2)

Publication Number Publication Date
EP2767991A1 EP2767991A1 (fr) 2014-08-20
EP2767991B1 true EP2767991B1 (fr) 2019-04-03

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE631809C (de) * 1931-02-01 1936-06-27 Siemens & Halske Akt Ges Hoechstspannungstransformator
DE603240C (de) * 1931-02-13 1934-09-26 Paul Reichert Isolationsanordnung fuer elektrische Apparate, insbesondere fuer Transformatoren, mit Luftisolation
CH167281A (de) * 1932-12-10 1934-02-15 Bbc Brown Boveri & Cie Elektrischer Apparat, insbesondere Transformator oder Messwandler in luft.
JPS59194409A (ja) * 1983-04-19 1984-11-05 Nichicon Capacitor Ltd 高電圧変圧器
US6933824B2 (en) * 2003-02-05 2005-08-23 Mcgraw-Edison Company Polymer sheet core and coil insulation for transformers

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

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