CA2360321A1 - 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 conductor Download PDFInfo
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- CA2360321A1 CA2360321A1 CA002360321A CA2360321A CA2360321A1 CA 2360321 A1 CA2360321 A1 CA 2360321A1 CA 002360321 A CA002360321 A CA 002360321A CA 2360321 A CA2360321 A CA 2360321A CA 2360321 A1 CA2360321 A1 CA 2360321A1
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- band
- conductor
- separating layer
- insulation
- electrical conductor
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- 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
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- 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
The invention relates to an electrical conductor (1) which can be glued in a groove (13) and is enveloped by a corona shield system (6). In said corona shield system (6) a separating layer (10) is provided for which compensates the difference in thermal expansion of the conductor (1) and groove (13). Sa id separating layer (10) can be configured as an expandable band. The corona shield system (6) also comprises a semiconducting base layer (7) and two ban ds (9, 11), which are rolled up together such that they overlap, and is readily produced by machine.
Description
ELECTRICAL CONDUCTOR, TURBOGENERATOR AND METHOD FOR
PRODUCING A CORONA SHIELD FOR AN ELECTRICAL CONDUCTOR
The present invention relates to an electrical conductor which can be glued in a groove with insulation and enveloped by a corona shield system. The invention therefore relates to a turbogenerator having a stator coil comprising such conductors and a process for manufacturing a corona shield for an electrical conductor which can be glued in a groove.
In the book "The Insulation of Large Electrical Machines" by Hartmut Meier, Springer-Verlag, Berlin, Giittingen, Heidelberg, 1963, relating to winding elements of stator coils of large electrical machines page 80 specifies that stator coils of large machines are constructed from individual, extensively similar winding elements. In order to reduce additional losses the winding elements are composed of individual, insulated and interlaced semiconductors. The side rod is generally used here, in which each semiconductor in the groove area passes once through all positions in the groove level, such that approximately identical voltages are induced by a groove cross-field in each semiconductor. Pages 83 to 85 further describe how an electrical conductor is insulated with a mica tape designated as mica foil.
A conductive coating is applied to the finished insulation, which as corona shield prevents groove discharges in the unavoidable air gaps between insulation surface and groove wall.
In the book "Producing Windings of Electrical Machines", published by H.
Sequenz, Springer Verlag Wien and New York, 1973, a corona shield for a conductor rod is described in greater detail on page 156. The corona shield must be sufficiently conductive to guarantee secure equipotential bonding over the entire conductor rod in length and circumference. The conductivity may not however exceed certain values in preventing currents resulting from a longitudinal groove stress or from a groove cross-field, which can destroy paintwork and finally can also damage insulation. For achieving good contact with the earthed bundle of laminations care must be taken when inserting the rods in the grooves.
In numerous cases coils of fibrous bands, for example asbestos bands, polyester bands or the like have been previously applied, which are coated with conductive paint and have a certain flexibility to adapt to the sheet contours of. the coated stator.
Chapter 2.2.3, page 150 treats vacuum-varnish impregnated mica tape insulation. The vacuum-varnish impregnation with hardenable, solvent-free resins enables the use of fine or laminated mica bands of various types for manufacturing conductive insulation. With the whole impregnation process (page 153) the conductor rods are first insulated by a mica band winding, provided with a corona shield and then laid in grooves of the bundle of laminations of the stator. Next, the whole stator, that is, the bundle of laminations and the inlaid electrical winding, are fully impregnated in a resin. The electrical conductors of the electrical coil are therefore glued to the bundle of laminations.
WO 97/04515 A1 discloses a winding element for an electrical machine. The winding element comprises an electrical conductor which is enveloped by insulation.
Applied to this insulation is a corona shield.
The corona shield comprises a band coated on both sides as a semiconductor.
This band is wound overlapping itself on the insulation. This gives rise to electrical contact between the inside and the outside semiconductor coating. The result of this is that the band interior remains essentially potential-free and thus there are no corona discharges.
The band interior contains a separating layer which is split up as a predetermined breaking point with a varying mechanical expansion of bundle of laminations and winding element. Thermal stresses between bundle of laminations and winding element are discharged.
The object of the invention is an electrical conductor which can be glued in a groove and which has an easily manufactured corona shield system. A further object of the invention is a turbogenerator with a stator coil whose conductors exhibit an easily manufactured corona shield system. Yet a further object of the invention is a process for manufacturing a corona shield for an electrical conductor which can be glued in a groove, which can be carried into effect easily and cost-effectively.
The object of the present invention focussing on an electrical conductor is solved by an electrical conductor comprising a conductive metal which can be glued in a groove having a groove wall, with insulation enclosing the conductive metal and a corona shield system enveloped by the insulation, whereby the corona shield system a) has a separating layer, by means of which a varying thermal expansion of the groove wall and of the conductive metal can be compensated, a) an at least slightly electrically conductive base layer, b) a band with bandwidth showing the separating layer and c) has a second, at least slightly conductive band, whereby d) the base layer is arranged on the insulation, and whereby e) the first band and the second band are rolled up together on the base layer.
PRODUCING A CORONA SHIELD FOR AN ELECTRICAL CONDUCTOR
The present invention relates to an electrical conductor which can be glued in a groove with insulation and enveloped by a corona shield system. The invention therefore relates to a turbogenerator having a stator coil comprising such conductors and a process for manufacturing a corona shield for an electrical conductor which can be glued in a groove.
In the book "The Insulation of Large Electrical Machines" by Hartmut Meier, Springer-Verlag, Berlin, Giittingen, Heidelberg, 1963, relating to winding elements of stator coils of large electrical machines page 80 specifies that stator coils of large machines are constructed from individual, extensively similar winding elements. In order to reduce additional losses the winding elements are composed of individual, insulated and interlaced semiconductors. The side rod is generally used here, in which each semiconductor in the groove area passes once through all positions in the groove level, such that approximately identical voltages are induced by a groove cross-field in each semiconductor. Pages 83 to 85 further describe how an electrical conductor is insulated with a mica tape designated as mica foil.
A conductive coating is applied to the finished insulation, which as corona shield prevents groove discharges in the unavoidable air gaps between insulation surface and groove wall.
In the book "Producing Windings of Electrical Machines", published by H.
Sequenz, Springer Verlag Wien and New York, 1973, a corona shield for a conductor rod is described in greater detail on page 156. The corona shield must be sufficiently conductive to guarantee secure equipotential bonding over the entire conductor rod in length and circumference. The conductivity may not however exceed certain values in preventing currents resulting from a longitudinal groove stress or from a groove cross-field, which can destroy paintwork and finally can also damage insulation. For achieving good contact with the earthed bundle of laminations care must be taken when inserting the rods in the grooves.
In numerous cases coils of fibrous bands, for example asbestos bands, polyester bands or the like have been previously applied, which are coated with conductive paint and have a certain flexibility to adapt to the sheet contours of. the coated stator.
Chapter 2.2.3, page 150 treats vacuum-varnish impregnated mica tape insulation. The vacuum-varnish impregnation with hardenable, solvent-free resins enables the use of fine or laminated mica bands of various types for manufacturing conductive insulation. With the whole impregnation process (page 153) the conductor rods are first insulated by a mica band winding, provided with a corona shield and then laid in grooves of the bundle of laminations of the stator. Next, the whole stator, that is, the bundle of laminations and the inlaid electrical winding, are fully impregnated in a resin. The electrical conductors of the electrical coil are therefore glued to the bundle of laminations.
WO 97/04515 A1 discloses a winding element for an electrical machine. The winding element comprises an electrical conductor which is enveloped by insulation.
Applied to this insulation is a corona shield.
The corona shield comprises a band coated on both sides as a semiconductor.
This band is wound overlapping itself on the insulation. This gives rise to electrical contact between the inside and the outside semiconductor coating. The result of this is that the band interior remains essentially potential-free and thus there are no corona discharges.
The band interior contains a separating layer which is split up as a predetermined breaking point with a varying mechanical expansion of bundle of laminations and winding element. Thermal stresses between bundle of laminations and winding element are discharged.
The object of the invention is an electrical conductor which can be glued in a groove and which has an easily manufactured corona shield system. A further object of the invention is a turbogenerator with a stator coil whose conductors exhibit an easily manufactured corona shield system. Yet a further object of the invention is a process for manufacturing a corona shield for an electrical conductor which can be glued in a groove, which can be carried into effect easily and cost-effectively.
The object of the present invention focussing on an electrical conductor is solved by an electrical conductor comprising a conductive metal which can be glued in a groove having a groove wall, with insulation enclosing the conductive metal and a corona shield system enveloped by the insulation, whereby the corona shield system a) has a separating layer, by means of which a varying thermal expansion of the groove wall and of the conductive metal can be compensated, a) an at least slightly electrically conductive base layer, b) a band with bandwidth showing the separating layer and c) has a second, at least slightly conductive band, whereby d) the base layer is arranged on the insulation, and whereby e) the first band and the second band are rolled up together on the base layer.
The conductor is impregnated by a resin for example in the groove for example of a bundle of laminations of an electrical machine, and as the resin hardens is glued together with the insulation and the corona shield system as adhesive matrix with the groove. In this case the conductor and the groove wall are glued together. Conductor and groove wall generally have a different mechanical expansion coefficient. Such warming or cooling of the entire arrangement can lead to build-up of thermal stresses between conductor and groove wall.
These mechanical stresses can lead uncontrollably to cracks in various positions, in particular in the hardened adhesive matrix. Such cracks can lead to corona discharges which can in turn lead to further damage and finally even to malfunction of the insulation. The separating layer serves to concentrate the cracks caused by thermal stresses in a controlled area. Outside this area almost no cracks appear, since the mechanical stresses are reduced by the separating layer. Corona discharges above the cracks in the separating layer are prevented by the separating layer being enclosed in between two potential-identical regions.
The first region is formed by the base layer and the second region is formed by the second, at least slightly conductive band and the groove wall. The second band has electrical contact with the groove wall. The second band is wound overlapping together with the first band on the base layer. As a result the second band also electrical contact with the base layer. Both regions accordingly have identical potential. The separating layer is thereby arranged between two potentially identical areas and is consequently not subject to any potential spikes which might lead to corona discharges.
This arrangement not only produces an effective corona shield, but can be manufactured readily and cost-effectively. In particular, there is also the possibility of production by machine, since the first and the second band can be wound together by an automatic winder in a single step.
The base layer is preferably configured as a band.
The second band preferably has the same bandwidth as the first band and is offset by half the bandwidth relative to the first band. This results in even winding of the conductor with the first and second band. The first and the second band are preferably each wound adjacent, leaving no gaps.
The double band formed by the first and second band is thus wound half-overlapping, resulting in an even thickness of the corona shield.
These mechanical stresses can lead uncontrollably to cracks in various positions, in particular in the hardened adhesive matrix. Such cracks can lead to corona discharges which can in turn lead to further damage and finally even to malfunction of the insulation. The separating layer serves to concentrate the cracks caused by thermal stresses in a controlled area. Outside this area almost no cracks appear, since the mechanical stresses are reduced by the separating layer. Corona discharges above the cracks in the separating layer are prevented by the separating layer being enclosed in between two potential-identical regions.
The first region is formed by the base layer and the second region is formed by the second, at least slightly conductive band and the groove wall. The second band has electrical contact with the groove wall. The second band is wound overlapping together with the first band on the base layer. As a result the second band also electrical contact with the base layer. Both regions accordingly have identical potential. The separating layer is thereby arranged between two potentially identical areas and is consequently not subject to any potential spikes which might lead to corona discharges.
This arrangement not only produces an effective corona shield, but can be manufactured readily and cost-effectively. In particular, there is also the possibility of production by machine, since the first and the second band can be wound together by an automatic winder in a single step.
The base layer is preferably configured as a band.
The second band preferably has the same bandwidth as the first band and is offset by half the bandwidth relative to the first band. This results in even winding of the conductor with the first and second band. The first and the second band are preferably each wound adjacent, leaving no gaps.
The double band formed by the first and second band is thus wound half-overlapping, resulting in an even thickness of the corona shield.
The first band preferably exhibits laminated mica. Laminated mica is applied to a carrier material such as paper. The laminated mica produces simple realisation of the separating layer. The laminated mica laminas side-slip on one another under mechanical stress. The electrical conductor can be displaced relative to the groove wall despite the adhesion. A
predetermined breaking point, which split up with varying mechanical expansion of the conductor and the groove wall, is created by the separating layer.
This effectively compensates the different thermal expansions and does not result in the build-up of significant mechanical stresses.
The first band is preferably configured as an expandable layer. In this case the separating layer is therefore no predetermined break point, rather it enables displacement of the electrical conductor relative to the groove wall with varying mechanical expansion by way of flexibility.
The first band is preferably an elastic band, in particular a silicon rubber band.
The first band also preferably exhibits a plurality of through openings. This ensures that the adhesive, for example an artificial resin, with which the insulation of the electrical conductor is impregnated and which serves as integrated adhesion of the electrical conductor with the groove wall or the groove, can penetrate the first band and push forward to the insulation.
The task focussed on an electrical conductor is also solved according to the present invention by an electrical conductor comprising a conductive metal, which can be glued in a groove with a groove wall, with insulation enveloped by an expandable separating layer, by means of which a varying thermal expansion of the groove wall can be compensated.
The expandable separating layer particularly easily creates a situation where thermal stresses between the electrical conductor and the groove wall are reduced with varying mechanical expansion of the electrical conductor relative to the groove wall.
This occurs with deformation of the expandable separating layer.
The separating layer is preferably not adhesive and temperature-stable, and is preferably a silicon rubber band. The separating layer preferably also has a plurality of through openings.
The electrical conductor is preferably configured for a stator coil of a turbogenerator.
The task focussed on a turbogenerator is solved according to the present invention by a turbogenerator with a stator coil comprising electrical conductors which are designed as per the abovementioned embodiments.
According to the present invention the task focussing on a process is solved by a process for manufacturing a corona shield system for an electrical conductor enveloped by insulation and which can be glued in a groove with a groove wall, in which a) an at least slightly conductive base layer is applied to the insulation;
b) a first band and a second, at least slightly conductive band offset relative to the first band, are wound together onto the base layer, whereby c) a separating layer is created by the first band, by means of which thermal expansion between the groove wall and the conductor can be compensated.
The advantages of this process result according to the abovementioned configurations on the advantages of the electrical conductor.
The separating layer is preferably configured as a laminated mica band.
The separating layer is preferably configured expansively, in particular as a silicon rubber band.
An embodiment of the invention will now be explained in greater detail with reference to the diagram, illustrated partly diagrammatically and not to scale:
Figure 1 shows an electrical conductor arranged in a groove, Figure 2 shows a longitudinal section through an electrical conductor, and Figure 3 shows a turbogenerator.
Identical reference numerals have the same value in the various figures.
Figure 1 illustrates an electrical conductor 1 in perspective. Electrical conductor 1 comprises a conductive metal 3. Conductive metal 3 is illustrated here as unstructured, but is generally comprised of a plurality of semiconductors and at times cooling ducts for coolant. Conductive metal 3 is enveloped by insulation 5. Applied to insulation 5 is a semiconductive base layer 7.
Base layer 7 can for example be a band wound onto insulation 5. A first band 11 is wound together with a second band 9 overlapping on base layer 7 configured as separating layer 10. Second band 9 is configured as a semiconductor. Base layer 7, second band 9 and first band 11 together form a corona shield system 6.
Electrical conductor 1 is arranged in a groove 13 on a groove wall 15. By means of second band 9 potential is evened out over the length of electrical conductor 1, so that corona discharges are avoided between groove wall 15 and electrical conductor 1.
Electrical conductor 1 is impregnated in groove 13 with a synthetic resin and glued to groove 13. When the overall arrangement of conductor 1 and groove 13 is heated or cooled the result is varying mechanical expansion between electrical conductor 1 and groove wall 15.
Because electrical conductor 1 is glued to groove wall 15, this leads to mechanical stresses.
These mechanical stresses can cause cracks, possibly resulting in a corona discharge.
Separating layer 10 is provided for reducing and/or controlling this crack development.
Separating layer 10 can for example be configured as a laminated mica band. In such a laminated mica band laminated mica laminas slip-slide when a mechanical stress is exerted.
This leads to the formation of a predetermined break point, inside which cracks caused by thermal stresses are concentrated. Slightly conductive second band 9 and slightly conductive base layer 7 envelop separating layer 10. Separating layer 10 and thus the resulting cracks are thereby found in a potential-free region. The potential freedom is achieved by the fact that slightly conductive second band 9 is both in contact with base layer 7, and also lies outside above separating layer 10, by means of the halfoverlapping winding together with first band 11, which forms separating layer 10. Therefore base layer 7 has electrical contact with second band 9 which is in turn in electrical contact with groove wall 15.
Base layer 7 and second band 9 or groove wall 15 thus have the same electrical potential.
Separating layer 10 accordingly lies in a potential-free zone.
Separating layer 10 can also be created by the formation of second band 11 as a silicon rubber band. Such a silicon rubber band is expandable. By way of compensation it absorbs varying thermal expansion of electrical conductor 1 and groove 15 by deformation.
Corona shield system 6 can be manufactured particularly easily and cost-effectively by the structure of base layer 7 and the two commonly wound bands 9,11. There is the added option of manufacturing corona shield system 6 by machine.
Figure 2 illustrates a longitudinal section through an electrical conductor 1.
As per Figure 1 electrical conductor 1 comprises a conductive metal 3 which is enveloped by insulation 5.
Slightly conductive base layer 7 is applied to insulation 5. Second band 9 and first band 11 are wound together onto slightly conductive base layer 7. Second band 9 and first band 11 each have a bandwidth B. Second band 9 is offset relative to first band 11 by half a bandwidth B/2. The double band formed from second band 9 and first band 11 is wound half-overlapping onto base layer 7, that is, both first band 11 and second band 9 also are each wound adjacent and there are no gaps. Second band 9 is slightly conductive and guarantees electrical contact of corona shield system 6 with a groove wall 15, not shown in greater detail here. Separating layer 10 is realised by first band 11, for example by being configured as a silicon rubber band, as explained in greater detail hereinabove.
Figure 3 illustrates a turbogenerator 21. Turbogenerator 21 has a rotor 23 directed along an axis 24.
Rotor 23 includes a shaft 25, to which a rotor winding 27 is connected. Rotor 23 is enveloped concentrically by a stator 29. Stator 29 includes a bundle of laminations 31, in the inner surface of which grooves 13 are laid parallel to axis 24. Laid in grooves13 are electrical conductors 1, of which one only is illustrated by way of example. Electrical conductors 1 form a stator winding 28. According to the embodiments in Figures 1 and 2 electrical conductors 1 are each provided with a corona shield 6 enveloping a slightly conductive second band 9 and a first band 11 forming a separating layer 10. Entire stator 29 is fully impregnated in a resin.
This full impregnation results in impregnation of insulation 5 of electrical conductors 1 and gluing of conductors 1 unaffected by vibration with bundle of laminations 31.
Stator 29 is arranged together with rotor 23 in a housing 35.
predetermined breaking point, which split up with varying mechanical expansion of the conductor and the groove wall, is created by the separating layer.
This effectively compensates the different thermal expansions and does not result in the build-up of significant mechanical stresses.
The first band is preferably configured as an expandable layer. In this case the separating layer is therefore no predetermined break point, rather it enables displacement of the electrical conductor relative to the groove wall with varying mechanical expansion by way of flexibility.
The first band is preferably an elastic band, in particular a silicon rubber band.
The first band also preferably exhibits a plurality of through openings. This ensures that the adhesive, for example an artificial resin, with which the insulation of the electrical conductor is impregnated and which serves as integrated adhesion of the electrical conductor with the groove wall or the groove, can penetrate the first band and push forward to the insulation.
The task focussed on an electrical conductor is also solved according to the present invention by an electrical conductor comprising a conductive metal, which can be glued in a groove with a groove wall, with insulation enveloped by an expandable separating layer, by means of which a varying thermal expansion of the groove wall can be compensated.
The expandable separating layer particularly easily creates a situation where thermal stresses between the electrical conductor and the groove wall are reduced with varying mechanical expansion of the electrical conductor relative to the groove wall.
This occurs with deformation of the expandable separating layer.
The separating layer is preferably not adhesive and temperature-stable, and is preferably a silicon rubber band. The separating layer preferably also has a plurality of through openings.
The electrical conductor is preferably configured for a stator coil of a turbogenerator.
The task focussed on a turbogenerator is solved according to the present invention by a turbogenerator with a stator coil comprising electrical conductors which are designed as per the abovementioned embodiments.
According to the present invention the task focussing on a process is solved by a process for manufacturing a corona shield system for an electrical conductor enveloped by insulation and which can be glued in a groove with a groove wall, in which a) an at least slightly conductive base layer is applied to the insulation;
b) a first band and a second, at least slightly conductive band offset relative to the first band, are wound together onto the base layer, whereby c) a separating layer is created by the first band, by means of which thermal expansion between the groove wall and the conductor can be compensated.
The advantages of this process result according to the abovementioned configurations on the advantages of the electrical conductor.
The separating layer is preferably configured as a laminated mica band.
The separating layer is preferably configured expansively, in particular as a silicon rubber band.
An embodiment of the invention will now be explained in greater detail with reference to the diagram, illustrated partly diagrammatically and not to scale:
Figure 1 shows an electrical conductor arranged in a groove, Figure 2 shows a longitudinal section through an electrical conductor, and Figure 3 shows a turbogenerator.
Identical reference numerals have the same value in the various figures.
Figure 1 illustrates an electrical conductor 1 in perspective. Electrical conductor 1 comprises a conductive metal 3. Conductive metal 3 is illustrated here as unstructured, but is generally comprised of a plurality of semiconductors and at times cooling ducts for coolant. Conductive metal 3 is enveloped by insulation 5. Applied to insulation 5 is a semiconductive base layer 7.
Base layer 7 can for example be a band wound onto insulation 5. A first band 11 is wound together with a second band 9 overlapping on base layer 7 configured as separating layer 10. Second band 9 is configured as a semiconductor. Base layer 7, second band 9 and first band 11 together form a corona shield system 6.
Electrical conductor 1 is arranged in a groove 13 on a groove wall 15. By means of second band 9 potential is evened out over the length of electrical conductor 1, so that corona discharges are avoided between groove wall 15 and electrical conductor 1.
Electrical conductor 1 is impregnated in groove 13 with a synthetic resin and glued to groove 13. When the overall arrangement of conductor 1 and groove 13 is heated or cooled the result is varying mechanical expansion between electrical conductor 1 and groove wall 15.
Because electrical conductor 1 is glued to groove wall 15, this leads to mechanical stresses.
These mechanical stresses can cause cracks, possibly resulting in a corona discharge.
Separating layer 10 is provided for reducing and/or controlling this crack development.
Separating layer 10 can for example be configured as a laminated mica band. In such a laminated mica band laminated mica laminas slip-slide when a mechanical stress is exerted.
This leads to the formation of a predetermined break point, inside which cracks caused by thermal stresses are concentrated. Slightly conductive second band 9 and slightly conductive base layer 7 envelop separating layer 10. Separating layer 10 and thus the resulting cracks are thereby found in a potential-free region. The potential freedom is achieved by the fact that slightly conductive second band 9 is both in contact with base layer 7, and also lies outside above separating layer 10, by means of the halfoverlapping winding together with first band 11, which forms separating layer 10. Therefore base layer 7 has electrical contact with second band 9 which is in turn in electrical contact with groove wall 15.
Base layer 7 and second band 9 or groove wall 15 thus have the same electrical potential.
Separating layer 10 accordingly lies in a potential-free zone.
Separating layer 10 can also be created by the formation of second band 11 as a silicon rubber band. Such a silicon rubber band is expandable. By way of compensation it absorbs varying thermal expansion of electrical conductor 1 and groove 15 by deformation.
Corona shield system 6 can be manufactured particularly easily and cost-effectively by the structure of base layer 7 and the two commonly wound bands 9,11. There is the added option of manufacturing corona shield system 6 by machine.
Figure 2 illustrates a longitudinal section through an electrical conductor 1.
As per Figure 1 electrical conductor 1 comprises a conductive metal 3 which is enveloped by insulation 5.
Slightly conductive base layer 7 is applied to insulation 5. Second band 9 and first band 11 are wound together onto slightly conductive base layer 7. Second band 9 and first band 11 each have a bandwidth B. Second band 9 is offset relative to first band 11 by half a bandwidth B/2. The double band formed from second band 9 and first band 11 is wound half-overlapping onto base layer 7, that is, both first band 11 and second band 9 also are each wound adjacent and there are no gaps. Second band 9 is slightly conductive and guarantees electrical contact of corona shield system 6 with a groove wall 15, not shown in greater detail here. Separating layer 10 is realised by first band 11, for example by being configured as a silicon rubber band, as explained in greater detail hereinabove.
Figure 3 illustrates a turbogenerator 21. Turbogenerator 21 has a rotor 23 directed along an axis 24.
Rotor 23 includes a shaft 25, to which a rotor winding 27 is connected. Rotor 23 is enveloped concentrically by a stator 29. Stator 29 includes a bundle of laminations 31, in the inner surface of which grooves 13 are laid parallel to axis 24. Laid in grooves13 are electrical conductors 1, of which one only is illustrated by way of example. Electrical conductors 1 form a stator winding 28. According to the embodiments in Figures 1 and 2 electrical conductors 1 are each provided with a corona shield 6 enveloping a slightly conductive second band 9 and a first band 11 forming a separating layer 10. Entire stator 29 is fully impregnated in a resin.
This full impregnation results in impregnation of insulation 5 of electrical conductors 1 and gluing of conductors 1 unaffected by vibration with bundle of laminations 31.
Stator 29 is arranged together with rotor 23 in a housing 35.
Claims (15)
1. An electrical conductor (1) which can be glued in a groove (13) with a groove wall (15), comprising a conductive metal (3), with insulation enveloping the conductive metal (3) and arranged above the insulation (5) a corona shield system (6), which corona shield system (6) exhibits a separating layer (10), by means of which variable thermal expansion of the groove wall (15) and of the conductive metal (3) can be compensated, characterised in that the corona shield system (6) has a) an at least slightly electrically conductive base layer b) a first band (11) exhibiting the separating layer (10) and c) has a second, at least slightly conductive band (9), whereby d) the base layer (7) is arranged on the insulation (5), and whereby e) the first band (11) and the second band (9) are rolled up together overlapping on the base layer (7).
2. Conductor (1) as claimed in Claim 1, characterised in that the first band (11) and the second band (9) have a bandwidth (B), whereby the second band (11) is offset by half the bandwidth (B) relative to the first band (11).
3. Conductor (1) as claimed in Claim 1 or 2, characterised in that the first band (11) exhibits laminated mica.
4. Conductor as claimed in Claim 1 or 2, characterised in that the separating layer (10) is configured as an expandable layer.
5. Conductor as claimed in Claim 4, characterised in that the first band (11) is configured as an expandable band, in particular as a silicon rubber band.
6. Conductor (1) as claimed in Claim 4 or 5, characterised in that the first band (11) exhibits a plurality of through openings (12).
7. Conductor (1) as claimed in any one of the foregoing claims, characterised by configuration for the stator coil (28) of a turbogenerator (21).
8. Electrical conductor (1) which can be glued in a groove (13) with a groove wall (15), comprising a conductive metal (3) with insulation (5) which is enveloped by a separating layer (10), by means of which variable thermal expansion of the groove wall (15) and of the conductive metal (3) can be compensated, characterised in that the separating layer (10) is expandable.
9. Conductor (1) as claimed in Claim 8, characterised in that the separating layer (10) is configured as an elastic band, in particular as a silicon rubber band.
10. Conductor (1) as claimed in Claim 9, characterised in that the separating layer (10) exhibits a plurality of through openings (12).
11. Conductor (1) as claimed in Claim 9 or 10, characterised by configuration for the stator coil (28) of a turbogenerator (21).
12. Turbogenerator (21) having a stator coil (28) with electrical conductors (1) configured as claimed in any one of the foregoing claims.
13. Process for manufacturing a corona shield (6) for an electrical conductor (1) enveloped by insulation (5) and glued in a groove (13) with a groove wall (15), in which a) an at least slightly conductive base layer (7) is applied to the insulation (5);
b) overlapping together on the base layer (7) a first band (11) and a second, at least slightly conductive band (9) offset relative to the first band (11) are wound onto the base layer (7), whereby c) a separating layer (10) is created by the first band (11), by means of which thermal expansion between the groove wall (15) and the conductor (1) can be compensated.
b) overlapping together on the base layer (7) a first band (11) and a second, at least slightly conductive band (9) offset relative to the first band (11) are wound onto the base layer (7), whereby c) a separating layer (10) is created by the first band (11), by means of which thermal expansion between the groove wall (15) and the conductor (1) can be compensated.
14. Process as claimed in Claim 13, wherein the first band (11) is a laminated mica band.
15. Process as claimed in Claim 13, wherein the first band (11) is configured as expandable, in particular as a silicon rubber band.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99100379 | 1999-01-18 | ||
| EP99100379.9 | 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2360321A1 true CA2360321A1 (en) | 2000-07-20 |
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ID=8237326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002360321A Abandoned CA2360321A1 (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) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10673294B2 (en) | 2014-09-25 | 2020-06-02 | Siemens Aktiengesellschaft | Corona shielding system for an electrical machine |
| US10862362B2 (en) | 2014-09-25 | 2020-12-08 | Siemens Aktiengesellschaft | Corona shielding system and electrical machine |
| US11081923B2 (en) | 2014-09-25 | 2021-08-03 | Siemens Aktiengesellschaft | Corona shielding system for an electrical machine |
Families Citing this family (4)
| 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 |
| 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 | ||
| WO1993006646A1 (en) * | 1991-09-13 | 1993-04-01 | Siemens Aktiengesellschaft | Impregnatable arrangement of a bearer and winding components |
| JP3647467B2 (en) * | 1995-07-18 | 2005-05-11 | シーメンス アクチエンゲゼルシヤフト | Winding element of electric machine |
| JPH09149578A (en) * | 1995-11-21 | 1997-06-06 | Fuji Electric Co Ltd | High pressure rotating machine coil |
| KR20000011131A (en) * | 1996-05-15 | 2000-02-25 | 칼 하인쯔 호르닝어 | Conductor winding arrangement for heavy electric machines |
-
2000
- 2000-01-10 CN CN 00802784 patent/CN1338141A/en active Pending
- 2000-01-10 JP JP2000594187A patent/JP2002535948A/en not_active Withdrawn
- 2000-01-10 BR BR0008891-9A patent/BR0008891A/en not_active Application Discontinuation
- 2000-01-10 CA CA002360321A patent/CA2360321A1/en not_active Abandoned
- 2000-01-10 WO PCT/EP2000/000110 patent/WO2000042695A1/en not_active Application Discontinuation
- 2000-01-10 EP EP00901519A patent/EP1149457A1/en not_active Withdrawn
- 2000-01-14 AR ARP000100167 patent/AR022288A1/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10673294B2 (en) | 2014-09-25 | 2020-06-02 | Siemens Aktiengesellschaft | Corona shielding system for an electrical machine |
| US10862362B2 (en) | 2014-09-25 | 2020-12-08 | Siemens Aktiengesellschaft | Corona shielding system and electrical machine |
| US11081923B2 (en) | 2014-09-25 | 2021-08-03 | Siemens Aktiengesellschaft | Corona shielding system for an electrical machine |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000042695A1 (en) | 2000-07-20 |
| AR022288A1 (en) | 2002-09-04 |
| JP2002535948A (en) | 2002-10-22 |
| EP1149457A1 (en) | 2001-10-31 |
| BR0008891A (en) | 2001-11-13 |
| CN1338141A (en) | 2002-02-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |