EP1149457A1 - Conducteur electrique, turboalternateur et procede pour produire un dispositif anti-effluves pour un conducteur electrique - Google Patents

Conducteur electrique, turboalternateur et procede pour produire un dispositif anti-effluves pour un conducteur electrique

Info

Publication number
EP1149457A1
EP1149457A1 EP00901519A EP00901519A EP1149457A1 EP 1149457 A1 EP1149457 A1 EP 1149457A1 EP 00901519 A EP00901519 A EP 00901519A EP 00901519 A EP00901519 A EP 00901519A EP 1149457 A1 EP1149457 A1 EP 1149457A1
Authority
EP
European Patent Office
Prior art keywords
band
conductor
insulation
electrical conductor
separating layer
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.)
Withdrawn
Application number
EP00901519A
Other languages
German (de)
English (en)
Inventor
Ingo Thiemann
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 AG
Voith Hydro Holding GmbH and Co KG
Original Assignee
Siemens AG
Voith Siemens Hydro Power Generation GmbH and Co KG
Voith Hydro Holding GmbH and Co KG
Voith Hydro 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 AG, Voith Siemens Hydro Power Generation GmbH and Co KG, Voith Hydro Holding GmbH and Co KG, Voith Hydro GmbH and Co KG filed Critical Siemens AG
Priority to EP00901519A priority Critical patent/EP1149457A1/fr
Publication of EP1149457A1 publication Critical patent/EP1149457A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges

Definitions

  • the invention relates to an electrical conductor which can be glued in a groove, with insulation and an external glow protection arrangement arranged above it.
  • the invention also relates to a turbogenerator with a stator winding made of such conductors and a method for producing an external glow protection for an electrical conductor which can be glued in a groove.
  • stator windings of large electrical machines consist of individual, largely identical to one another Winding elements are constructed.
  • the winding elements are composed of individual, partially insulated and interwoven partial conductors.
  • the Röbel rod, in which each sub-conductor in the slot area passes through all the layers at the slot height once, is generally customary, so that approximately the same voltages are induced in each sub-conductor by a transverse groove field.
  • Pages 83 to 85 also describe how an electrical conductor is insulated with a mica tape called micafolium. A conductive coating is applied to the finished insulation, which prevents groove discharges in the inevitable air gaps between the insulation surface and the groove wall as external glow protection.
  • windings made of fibrous tapes are applied beforehand, which in turn are coated with conductive lacquer and have a certain flexibility in order to adapt somewhat to the sheet metal contours of the layered stator.
  • Chapter 2.2.3 on page 150 deals with vacuum-soaked mica tape insulation. Vacuum impregnation with hardenable, solvent-free resins enables the use of various types of fine or split mica tapes to produce the conductor insulation.
  • complete impregnation page 153
  • the conductor bars are first completely insulated with a mica tape winding, provided with glow protection and then inserted into the grooves in the laminated core of the stator.
  • the entire stator, ie the laminated core and the electrical winding inserted therein, are then completely soaked in a resin. The electrical conductors of the electrical winding are thus glued to the laminated core.
  • WO 97/04515 AI discloses a winding element for an electrical machine.
  • the winding element consists of an electrical conductor, which is surrounded by insulation. External glow protection is applied to this insulation.
  • the external glow protection consists of a tape that is semiconductively coated on both sides. This tape is self-overlapping wound on the insulation. This results in electrical contact between the internal and the external semiconductive coating. As a result, the interior of the strip is essentially potential-free remains and therefore no glow discharges arise.
  • the inside of the strip contains a separating layer which splits as a predetermined breaking point in the event of a different mechanical expansion of the laminated core and the winding element. This reduces thermal stresses between the laminated core and the winding element.
  • the object directed to an electrical conductor is achieved by an electrical conductor made of a conductor metal which can be glued in a groove to a groove wall, with an insulation surrounding the conductor metal and an outer glow protection arrangement arranged above the insulation, the outer glow protection arrangement a) having a separating layer, by means of which a different thermal expansion of the groove wall and the conductor metal can be compensated for, a) an electrically at least weakly conductive base layer, b) a band having the separating layer with a band width and c) a second, at least weakly conductive band, where d) the base layer is arranged on the insulation, and wherein e) the first tape and the second tape are wound one on top of the other on the base layer.
  • the conductor is soaked in the groove, for example in a laminated core of an electrical machine, through a resin and glued to the groove as an adhesive matrix together with the insulation and the external glow protection arrangement via the hardening of the resin.
  • the conductor and the groove wall are glued together.
  • the conductor and slot wall generally have a different mechanical expansion coefficient. This results in heating or cooling of the entire arrangement to build up thermal tensions between the conductor and the groove wall.
  • These mechanical stresses can lead to cracks in uncontrollable positions at different positions, especially in the hardened adhesive matrix. Such cracks can lead to glow discharges, which can lead to further damage and ultimately even to failure of the insulation.
  • the separation layer serves to concentrate the cracks caused by thermal stresses in a controlled area.
  • the separating layer is arranged between two regions of equal potential and is therefore not exposed to any potential peaks which could lead to glow discharges.
  • the base layer is preferably also designed as a band.
  • the second band preferably has the same bandwidth as the first band and is offset by half the bandwidth compared to the first band. This results in a uniform winding of the conductor with the first and second tape.
  • the first and the second tape are preferably wound in an abutting manner so that no gaps arise.
  • the double tape formed from the first and second tape is thus wound semi-overlapping, which leads to a uniform thickness of the external glow protection.
  • the first band preferably has split mica.
  • split mica is applied to a carrier material, such as paper. Through the gap mica, a very simple implementation of the separation layer is obtained.
  • the split mica platelets slide on each other under mechanical tension. This allows the electrical conductor to move relative to the groove wall despite the gluing.
  • a predetermined breaking point is generated by the separating layer, which splits if the conductor and the groove wall have different mechanical expansions. This compensates for the different thermal expansions and there is no build-up of significant mechanical stresses.
  • the first band is preferably designed as an extensible layer.
  • the separating layer is not a predetermined breaking point, but instead enables the electrical conductor to be displaced relative to the groove wall with a different mechanical expansion due to flexibility.
  • the first band is preferably an elastic band, in particular a silicone rubber band. More preferably, the first band has a plurality of through openings. This ensures that the adhesive, for example a synthetic resin, with which the insulation of the electrical conductor is impregnated and which serves the holistic bonding of the electrical conductor to the groove wall or the groove, can penetrate the first band and penetrate for insulation.
  • an electrical conductor made of a conductor metal which can be glued in a groove to a groove wall, with an insulation which is surrounded by an expandable separating layer, by means of which a different thermal expansion of the groove wall can be compensated.
  • the stretchable separating layer Due to the stretchable separating layer, it is achieved in a particularly simple manner that thermal stresses between the electrical conductor and the groove wall are reduced with a different mechanical expansion of the electrical conductor relative to the groove wall. This is done by deforming the stretchable separating layer.
  • the separating layer is preferably non-adhesive and temperature-stable, preferably a silicone rubber tape.
  • the separating layer further preferably has a multiplicity of through openings.
  • the electrical conductor is preferably designed for a stator winding of a turbogenerator.
  • turbogenerator with a stator winding made of electrical conductors which are designed in accordance with the above statements.
  • the object directed to a method is achieved by a method for producing an external glow protector for an adhesive bondable in a groove to a groove wall.
  • ren electrical conductor surrounded by insulation in which a) an at least weakly conductive base layer is applied to the insulation; b) a first band and a second, at least weakly conductive band, offset from the first band, are wound onto the base layer together on the base layer, c) providing a separating layer through the first band, by means of which thermal expansion between the groove wall and the conductor can be compensated.
  • the separating layer is preferably designed as a split mica tape.
  • the separating layer is preferably designed to be stretchable, in particular as a silicone rubber tape.
  • Figure 1 shows an electrical conductor 1 in a perspective view.
  • the electrical conductor 1 has a conductor metal 3.
  • the conductor metal 3 is shown here without a structure, but is generally made up of a large number of sub-conductors and possibly cooling channels for cooling fluid.
  • the conductor metal 3 is surrounded by insulation 5.
  • a semiconducting base layer 7 is applied to the insulation 5.
  • the base layer 7 can be, for example, a tape wound on the insulation 5.
  • a first tape 11 designed as a separating layer 10 is wound onto the base layer 7 in an overlapping manner together with a second tape 9.
  • the second band 9 is semiconducting.
  • the base layer 7, the second band 9 and the first band 11 together form an external glow protection arrangement 6.
  • the electrical conductor 1 is arranged in a groove 13 on a groove wall 15. By means of the second band 9 is about
  • Length of the electrical conductor 1 reaches a potential equalization, so that glow discharges between the groove wall 15 and the electrical conductor 1 are prevented.
  • the electrical conductor 1 is impregnated in the groove 13 with a synthetic resin and glued to the groove 13.
  • a synthetic resin When the entire arrangement of conductor 1 and groove 13 heats up or cools, there is a different mechanical expansion between the electrical conductor 1 and the groove wall 15. Since the electrical conductor 1 is glued to the groove wall 15, this leads to mechanical stresses . These mechanical stresses can cause cracks, which can lead to a glow discharge.
  • the separating layer 10 is provided to reduce and / or to control this crack formation.
  • the separating layer 10 can be designed, for example, as split mica tape. In such a split mica strip, split mica sheets slide on one another when mechanical tension is exerted. This leads to the formation of a predetermined breaking point within -lerer be caused by thermal stress cracks conc e ntr Schl.
  • the weakly conductive second band 9 and the weakly conductive base layer 7 surrounds the separating layer 10. As a result, the separating layer 10 and thus the cracks which are produced are located in a potential-free area.
  • the potential freedom is achieved in that the weakly conductive second band 9 is in contact with the base layer 7 as well as outside with the base layer 7 via the semi-overlapping winding together with the first band 11, which forms the separating layer 10.
  • the base layer 7 is in electrical contact with the second band 9, which in turn is in electrical contact with the groove wall 15.
  • the base layer 7 and the second band 9 or the groove wall 15 thus have the same electrical potential.
  • the separating layer 10 thus lies in a potential-free area.
  • the separating layer 10 can also be formed by forming the second band 11 as a silicone rubber band.
  • a silicone rubber strap is stretchable. It compensates for different thermal expansion of the electrical conductor 1 and the groove 15 due to a deformation.
  • the external glow protection arrangement 6 is particularly simple and inexpensive to manufacture due to the construction of the base layer 7 and the two coils 9, 11 wound together. In addition, there is the possibility of mechanically producing the external glow protection arrangement 6.
  • FIG. 2 shows a longitudinal section through an electrical conductor 1.
  • the electrical conductor 1 is constructed from a conductor metal 3, which is surrounded by insulation 5.
  • the weakly conductive base layer 7 is applied to the insulation 5.
  • the second band 9 and the first band 11 are common to the weakly conductive base layer 7. wound up.
  • the second band 9 and the first band 11 each have a bandwidth B.
  • the second band 9 is offset from the first band 11 by half a bandwidth B / 2. That from the second volume 9 and the first volume 11
  • the double tape formed is wound onto the base layer 7 in a semi-overlapping manner, ie both the first tape 11 and the second tape 9 are wound in an abutting manner and there are no gaps.
  • the second band 9 is weakly conductive and ensures electrical contact of the external glow protection arrangement ⁇ with a groove wall 15 (not shown here in more detail).
  • the separating layer 10 is realized via the first band 11, for example by being embodied as a silicone rubber band, as explained in more detail above.
  • FIG. 3 shows a turbogenerator 21.
  • the turbogenerator 21 has a rotor 23 directed along an axis 24.
  • the rotor 23 comprises a shaft 25, on which a rotor winding 27 is applied.
  • the rotor 23 is concentrically surrounded by a stator 29.
  • the stator 29 comprises a laminated core 31, in the inner surface of which grooves 24 are made parallel to the axis 24.
  • Electrical conductors 1 are inserted into the grooves 13, only one of which is shown by way of example.
  • the electrical conductors 1 form a stator winding 28.
  • the electrical conductors 1 are each provided with an external glow protection 6 comprising a weakly conductive second band 9 and a first band 11 forming a separating layer 10, in accordance with the explanations relating to FIGS. 1 and 2.
  • the entire stator 29 is completely soaked in a resin. This complete impregnation results in an impregnation of the insulation 5 of the electrical conductors 1 and a vibration-resistant bonding of the conductors 1 to the 31ech package 31.
  • the stator 29 is arranged together with the rotor 23 in a housing 35.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

L'invention concerne un conducteur électrique (1) pouvant être collé dans une rainure (13), ledit conducteur (1) étant entouré d'un dispositif anti-effluves (6). Ce dernier comporte une couche de séparation (10) qui compense les différentes dilatations thermiques du conducteur (1) et de la rainure (13). Cette couche de séparation (10) peut se présenter sous la forme d'une bande extensible. Le dispositif anti-effluves (6) comprend une couche de fond semiconductrice (7) et deux bandes (9, 11) enroulées de façon à se chevaucher. Ce dispositif anti-effluves (6) peut être produit facilement de manière mécanique.
EP00901519A 1999-01-18 2000-01-10 Conducteur electrique, turboalternateur et procede pour produire un dispositif anti-effluves pour un conducteur electrique Withdrawn EP1149457A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00901519A EP1149457A1 (fr) 1999-01-18 2000-01-10 Conducteur electrique, turboalternateur et procede pour produire un dispositif anti-effluves pour un conducteur electrique

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP99100379 1999-01-18
EP99100379 1999-01-18
PCT/EP2000/000110 WO2000042695A1 (fr) 1999-01-18 2000-01-10 Conducteur electrique, turboalternateur et procede pour produire un dispositif anti-effluves pour un conducteur electrique
EP00901519A EP1149457A1 (fr) 1999-01-18 2000-01-10 Conducteur electrique, turboalternateur et procede pour produire un dispositif anti-effluves pour un conducteur electrique

Publications (1)

Publication Number Publication Date
EP1149457A1 true EP1149457A1 (fr) 2001-10-31

Family

ID=8237326

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00901519A Withdrawn EP1149457A1 (fr) 1999-01-18 2000-01-10 Conducteur electrique, turboalternateur et procede pour produire un dispositif anti-effluves pour un conducteur electrique

Country Status (7)

Country Link
EP (1) EP1149457A1 (fr)
JP (1) JP2002535948A (fr)
CN (1) CN1338141A (fr)
AR (1) AR022288A1 (fr)
BR (1) BR0008891A (fr)
CA (1) CA2360321A1 (fr)
WO (1) WO2000042695A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007282410A (ja) * 2006-04-10 2007-10-25 Toshiba Corp 回転電機の固定子コイル、回転電機の固定子コイルの製造方法、半導電性シート、半導電性テープ、および回転電機
JP4913551B2 (ja) 2006-11-07 2012-04-11 株式会社日立製作所 回転電機巻線及び回転電機並びにそれに用いる半導電性絶縁基材
DE102014219441A1 (de) 2014-09-25 2016-03-31 Siemens Aktiengesellschaft Glimmschutzsystem und elektrische Maschine
DE102014219439A1 (de) 2014-09-25 2016-03-31 Siemens Aktiengesellschaft Glimmschutzsystem für eine elektrische Maschine
DE102014219440A1 (de) 2014-09-25 2016-03-31 Siemens Aktiengesellschaft Glimmschutzsystem für eine elektrische Maschine und elektrische Maschine
JP6585441B2 (ja) * 2015-09-17 2019-10-02 株式会社東芝 回転電機コイル、回転電機、および回転電機コイルの製造方法
EP3240150A1 (fr) * 2016-04-25 2017-11-01 Siemens Aktiengesellschaft Machine electrique et procede de demontage et de production d'une machine electrique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50151304A (fr) * 1974-05-29 1975-12-05
WO1993006646A1 (fr) * 1991-09-13 1993-04-01 Siemens Aktiengesellschaft Dispositif impregnable constitue d'un support et d'elements d'enroulement
JP3647467B2 (ja) * 1995-07-18 2005-05-11 シーメンス アクチエンゲゼルシヤフト 電気機械の巻線要素
JPH09149578A (ja) * 1995-11-21 1997-06-06 Fuji Electric Co Ltd 高圧回転機コイル
KR20000011131A (ko) * 1996-05-15 2000-02-25 칼 하인쯔 호르닝어 대형 전기 기계용 컨덕터 와인딩 장치

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0042695A1 *

Also Published As

Publication number Publication date
WO2000042695A1 (fr) 2000-07-20
AR022288A1 (es) 2002-09-04
JP2002535948A (ja) 2002-10-22
BR0008891A (pt) 2001-11-13
CN1338141A (zh) 2002-02-27
CA2360321A1 (fr) 2000-07-20

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