EP1149457A1 - Electrical conductor, turbogenerator and method for producing a corona shield for an electrical conductor - Google Patents
Electrical conductor, turbogenerator and method for producing a corona shield for an electrical conductorInfo
- 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- Withdrawn
Links
- 239000004020 conductor Substances 0.000 title claims abstract description 88
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 238000009413 insulation Methods 0.000 claims description 31
- 238000004804 winding Methods 0.000 claims description 25
- 239000002184 metal Substances 0.000 claims description 14
- 239000010445 mica Substances 0.000 claims description 14
- 229910052618 mica group Inorganic materials 0.000 claims description 14
- 229920002379 silicone rubber Polymers 0.000 claims description 9
- 239000004945 silicone rubber Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 230000035882 stress Effects 0.000 description 5
- 238000005470 impregnation Methods 0.000 description 4
- 230000008646 thermal stress Effects 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
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)
- Suspension Of Electric Lines Or Cables (AREA)
- Manufacture Of Motors, Generators (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00901519A EP1149457A1 (en) | 1999-01-18 | 2000-01-10 | Electrical conductor, turbogenerator and method for producing a corona shield for an electrical conductor |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99100379 | 1999-01-18 | ||
EP99100379 | 1999-01-18 | ||
PCT/EP2000/000110 WO2000042695A1 (en) | 1999-01-18 | 2000-01-10 | Electrical conductor, turbogenerator and method for producing a corona shield for an electrical conductor |
EP00901519A EP1149457A1 (en) | 1999-01-18 | 2000-01-10 | Electrical conductor, turbogenerator and method for producing a corona shield for an electrical conductor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1149457A1 true EP1149457A1 (en) | 2001-10-31 |
Family
ID=8237326
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00901519A Withdrawn EP1149457A1 (en) | 1999-01-18 | 2000-01-10 | Electrical conductor, turbogenerator and method for producing a corona shield for an electrical conductor |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1149457A1 (en) |
JP (1) | JP2002535948A (en) |
CN (1) | CN1338141A (en) |
AR (1) | AR022288A1 (en) |
BR (1) | BR0008891A (en) |
CA (1) | CA2360321A1 (en) |
WO (1) | WO2000042695A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007282410A (en) * | 2006-04-10 | 2007-10-25 | Toshiba Corp | Rotating electric machine, stator coil thereof, its manufacturing method, and semiconductive sheet, semiconductive tape |
JP4913551B2 (en) | 2006-11-07 | 2012-04-11 | 株式会社日立製作所 | Rotating electrical machine winding, rotating electrical machine, and semiconductive insulating substrate used therefor |
DE102014219441A1 (en) * | 2014-09-25 | 2016-03-31 | Siemens Aktiengesellschaft | Corona protection system and electrical machine |
DE102014219439A1 (en) | 2014-09-25 | 2016-03-31 | Siemens Aktiengesellschaft | Corona protection system for an electrical machine |
DE102014219440A1 (en) | 2014-09-25 | 2016-03-31 | Siemens Aktiengesellschaft | Corona protection system for an electric machine and electric machine |
JP6585441B2 (en) * | 2015-09-17 | 2019-10-02 | 株式会社東芝 | Rotating electrical machine coil, rotating electrical machine, and method of manufacturing rotating electrical machine coil |
EP3240150A1 (en) * | 2016-04-25 | 2017-11-01 | Siemens Aktiengesellschaft | Electrical machine and method for dismantling and assembling the electric machine |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50151304A (en) * | 1974-05-29 | 1975-12-05 | ||
DE59204278D1 (en) * | 1991-09-13 | 1995-12-14 | Siemens Ag | IMPREGNABLE ARRANGEMENT FROM A SUPPORT BODY AND WINDING ELEMENTS. |
EP0839402B1 (en) * | 1995-07-18 | 1999-04-21 | Siemens Aktiengesellschaft | Winding element for an electrical machine |
JPH09149578A (en) * | 1995-11-21 | 1997-06-06 | Fuji Electric Co Ltd | High pressure rotating machine coil |
ATE211592T1 (en) * | 1996-05-15 | 2002-01-15 | Voith Siemens Hydro Power | CONDUCTOR WINDING ARRANGEMENT FOR A LARGE ELECTRICAL MACHINE |
-
2000
- 2000-01-10 CA CA002360321A patent/CA2360321A1/en not_active Abandoned
- 2000-01-10 BR BR0008891-9A patent/BR0008891A/en not_active Application Discontinuation
- 2000-01-10 JP JP2000594187A patent/JP2002535948A/en not_active Withdrawn
- 2000-01-10 EP EP00901519A patent/EP1149457A1/en not_active Withdrawn
- 2000-01-10 WO PCT/EP2000/000110 patent/WO2000042695A1/en not_active Application Discontinuation
- 2000-01-10 CN CN 00802784 patent/CN1338141A/en active Pending
- 2000-01-14 AR ARP000100167 patent/AR022288A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO0042695A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1338141A (en) | 2002-02-27 |
AR022288A1 (en) | 2002-09-04 |
JP2002535948A (en) | 2002-10-22 |
BR0008891A (en) | 2001-11-13 |
WO2000042695A1 (en) | 2000-07-20 |
CA2360321A1 (en) | 2000-07-20 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20010804 |
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AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: VOITH SIEMENS HYDRO POWER GENERATION GMBH & CO. KG Owner name: SIEMENS AKTIENGESELLSCHAFT |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20030909 |
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RBV | Designated contracting states (corrected) |
Designated state(s): BE CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT Owner name: VOITH SIEMENS HYDRO POWER GENERATION GMBH & CO. KG |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: SIEMENS AKTIENGESELLSCHAFT Owner name: VOITH SIEMENS HYDRO POWER GENERATION GMBH & CO. KG |