CA2144046A1 - High-voltage winding - Google Patents
High-voltage windingInfo
- Publication number
- CA2144046A1 CA2144046A1 CA 2144046 CA2144046A CA2144046A1 CA 2144046 A1 CA2144046 A1 CA 2144046A1 CA 2144046 CA2144046 CA 2144046 CA 2144046 A CA2144046 A CA 2144046A CA 2144046 A1 CA2144046 A1 CA 2144046A1
- Authority
- CA
- Canada
- Prior art keywords
- glass
- winding
- tube
- fibre tube
- glass fibre
- 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.)
- Abandoned
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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
- H02K3/505—Fastening of winding heads, equalising connectors, or connections thereto for large machine windings, e.g. bar windings
-
- 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
- H01F2027/329—Insulation with semiconducting layer, e.g. to reduce corona effect
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Bodies (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Moulding By Coating Moulds (AREA)
- Laminated Bodies (AREA)
Abstract
The object of the invention is a low-part-load and mechani-cally reliable fixing for a high-voltage winding which can also be easily manufactured. The winding is fixed in the region of its head with a glass-fibre tube (1) passing around each winding rod (2). The glass-fibre tube is surrounded by a woven glass or polyester struc-ture. In order to obtain good mechanical strength the glass-fibre tubes (1) are filled with a resin. In order to prevent partial dis-charges in the interstices (4) formed by the glass-fibre tube (1) and the rod or winding insulation (3), the glass-fibre tube is coated with a semiconducting polymer. The purpose of the elastic polymer coat-ing is to provide a seal when resin is injected into the woven glass tube. In addition, the entire potential distribution between the two conductors and coil or rod insulation is shifted in favour of the glass tube, thus preventing the ionisation of the interstices.
Description
21~0~6 -- High Voltage Winding The invention relates to a high-voltage winding of a rotating electrical machine in which the head of the winding is structurally supported by at least one continuous glass fibre tube which is preferably surrounded by a woven 5 glass or polyester structure and is in particular filled with a resin which becomes cross-linked at room temperature.
Because of their function, the windings of electrical machines are exposed to electromagnetic and thermomechanical forces. When non-steady states occur in the machine, or if the machine is incorrectly operated or suffers 10 a malfunction - e.g. short circuits, faulty synchronization - the resulting forces can be several times higher than those encountered during rated operation. In order to guarantee that the machine can operate with a high degree of reliability and safety, it is essential not only that the winding be held securely in the slots of the armature, but also that the winding overhang be securely 1 5 fastened.
In the high-voltage winding of the kind referred to above, the winding is fastened with the aid of glass-fibre tubes which are surrounded by a woven glass or polyester structure. To start off with, these tubes are passed around the winding overhangs, thereby at the same time acting as spacers between 20 the overhangs. In order to achieve adequate mechanical strength, the tubes are then filled with a resin which undergoes cross-linking at room temperature.
Various methods of attachment have proved effective in supporting the winding head; their function is generally based on the fact that adjacent winding rods are tangentially supported while being spaced a certain distance 25 apart from each other, depending on the operating voltage of the machine. If it is necessary because of the anticipated mechanical stresses, additional radial support in the form of brackets and stiffening rings is provided for the conicalstructure formed by the winding overhang.
In the process, it is unavoidable that, particularly in the case of the 30 tangential support, and depending on the design of the support elements such as spacers, tubes or bandages, more or less large interstices and gaps will be formed as a result of the manufacturing process, and these might lead to partial discharges at the phase separation points. In the course of operation, 214~046 .
Because of their function, the windings of electrical machines are exposed to electromagnetic and thermomechanical forces. When non-steady states occur in the machine, or if the machine is incorrectly operated or suffers 10 a malfunction - e.g. short circuits, faulty synchronization - the resulting forces can be several times higher than those encountered during rated operation. In order to guarantee that the machine can operate with a high degree of reliability and safety, it is essential not only that the winding be held securely in the slots of the armature, but also that the winding overhang be securely 1 5 fastened.
In the high-voltage winding of the kind referred to above, the winding is fastened with the aid of glass-fibre tubes which are surrounded by a woven glass or polyester structure. To start off with, these tubes are passed around the winding overhangs, thereby at the same time acting as spacers between 20 the overhangs. In order to achieve adequate mechanical strength, the tubes are then filled with a resin which undergoes cross-linking at room temperature.
Various methods of attachment have proved effective in supporting the winding head; their function is generally based on the fact that adjacent winding rods are tangentially supported while being spaced a certain distance 25 apart from each other, depending on the operating voltage of the machine. If it is necessary because of the anticipated mechanical stresses, additional radial support in the form of brackets and stiffening rings is provided for the conicalstructure formed by the winding overhang.
In the process, it is unavoidable that, particularly in the case of the 30 tangential support, and depending on the design of the support elements such as spacers, tubes or bandages, more or less large interstices and gaps will be formed as a result of the manufacturing process, and these might lead to partial discharges at the phase separation points. In the course of operation, 214~046 .
additional accumulation of dirt on the winding head due to abrasion of the brushes or oil vapour, may cause greatly elevated discharges at those points and consequently lead to the destruction of the surface of the insulation.
It is an object of the invention to avoid the above-mentioned 5 disadvantages and to achieve a low partial discharge level and a mechanically reliable fixing which, in addition, is easy to manufacture.
The high-voltage winding according to the invention is characterized by the fact that the outer surface of the glass fibre tube is provided with a semi-conducting coating of polymer.
The invention offers two advantages. The elastic polymer coating acts as a seal to permit the woven glass tube to be injected with resin, preferably using a needle and a metering system. The polymer coating surrounds the needle when it is inserted into the glass tube and thus substantially prevents resin from escaping at the needle insertion point. The second advantage is that the electrical potential is controlled. In order to avoid partial discharges in the interstices formed between the glass fibre tube and the insulation of the rod or coil, suitable substances are added to the polymer coating to make it semi-conducting. In this way, the entire potential distribution between the two conductors and the spool or rod insulation is shifted in favour of the glass tube and thus ionization of the interstices is avoided.
According to a further characteristic of the invention, the polymer coating is a layer of silicone containing silicon carbide. During tests, such materials have displayed excellent results, especially that of being economically effective.
Accord ing to a special embodiment of the invention, the semi-conducting polymer coating is subdivided at the circumference of the glass fibre tube by non-conducting sections. This design has proved favourable for achieving a low level of partial discharges.
The invention will now be described on the basis of an embodiment illustrated in the drawing. Fig. 1 shows the winding head in diagrammatic form and Fig. 2 shows the glass fibre tube positioned between two coils.
According to Fig. 1, the coil is fastened in the area of the coil head by means of a glass fibre tube 1 which is wrapped around each coil rod 2. The glass fibre tube is surrounded by a woven glass or polyester structure. In order to obtain good mechanical strength, the glass fibre tubes 1 are filled with resin.
The number of rows of glass fibre tubing 1 used to space the coil overhangs depends on the maximum permissible distance between the rows. However, at least one row of spacer tubing is provided in the upper and lower layer 5 respectively of the winding. Naturally, the diameter of the glass fibre tube 1 is selected in accordance with the spacing between the overhanging ends of the winding rods.
Fig. 2 shows that the glass fibre tube 1 is provided with a semi-conducting polymer coating 6 in order to avoid partial discharges in the 10 interstices 4 formed between the glass fibre tube 1 and the insulation 3 of the rod or coil 2.
This polymer coating 6 may also - in a manner not illustrated here -completely surround the surface of the glass fibre tube.
It is, however, advantageous to subdivide the semi-conducting polymer 15 coating 6 at the circumference of the tube by interposing non-conducting sections 5. In this way, the entire potential distribution between the two copper conductors 2 or the insulation 3 of the conductors is shifted in favour of the glass fibre tube 1 and thus ionization of the interstices 4 is avoided.
The semi-conducting polymer coating 6 on the outer surface of the glass 20 fibre tube contains, for example, an addition of silicon carbide and takes the form of an elastic layer of silicone.
It is an object of the invention to avoid the above-mentioned 5 disadvantages and to achieve a low partial discharge level and a mechanically reliable fixing which, in addition, is easy to manufacture.
The high-voltage winding according to the invention is characterized by the fact that the outer surface of the glass fibre tube is provided with a semi-conducting coating of polymer.
The invention offers two advantages. The elastic polymer coating acts as a seal to permit the woven glass tube to be injected with resin, preferably using a needle and a metering system. The polymer coating surrounds the needle when it is inserted into the glass tube and thus substantially prevents resin from escaping at the needle insertion point. The second advantage is that the electrical potential is controlled. In order to avoid partial discharges in the interstices formed between the glass fibre tube and the insulation of the rod or coil, suitable substances are added to the polymer coating to make it semi-conducting. In this way, the entire potential distribution between the two conductors and the spool or rod insulation is shifted in favour of the glass tube and thus ionization of the interstices is avoided.
According to a further characteristic of the invention, the polymer coating is a layer of silicone containing silicon carbide. During tests, such materials have displayed excellent results, especially that of being economically effective.
Accord ing to a special embodiment of the invention, the semi-conducting polymer coating is subdivided at the circumference of the glass fibre tube by non-conducting sections. This design has proved favourable for achieving a low level of partial discharges.
The invention will now be described on the basis of an embodiment illustrated in the drawing. Fig. 1 shows the winding head in diagrammatic form and Fig. 2 shows the glass fibre tube positioned between two coils.
According to Fig. 1, the coil is fastened in the area of the coil head by means of a glass fibre tube 1 which is wrapped around each coil rod 2. The glass fibre tube is surrounded by a woven glass or polyester structure. In order to obtain good mechanical strength, the glass fibre tubes 1 are filled with resin.
The number of rows of glass fibre tubing 1 used to space the coil overhangs depends on the maximum permissible distance between the rows. However, at least one row of spacer tubing is provided in the upper and lower layer 5 respectively of the winding. Naturally, the diameter of the glass fibre tube 1 is selected in accordance with the spacing between the overhanging ends of the winding rods.
Fig. 2 shows that the glass fibre tube 1 is provided with a semi-conducting polymer coating 6 in order to avoid partial discharges in the 10 interstices 4 formed between the glass fibre tube 1 and the insulation 3 of the rod or coil 2.
This polymer coating 6 may also - in a manner not illustrated here -completely surround the surface of the glass fibre tube.
It is, however, advantageous to subdivide the semi-conducting polymer 15 coating 6 at the circumference of the tube by interposing non-conducting sections 5. In this way, the entire potential distribution between the two copper conductors 2 or the insulation 3 of the conductors is shifted in favour of the glass fibre tube 1 and thus ionization of the interstices 4 is avoided.
The semi-conducting polymer coating 6 on the outer surface of the glass 20 fibre tube contains, for example, an addition of silicon carbide and takes the form of an elastic layer of silicone.
Claims (3)
1. A high-voltage winding of a rotating electrical machine in which the winding head is structurally supported by means of at least one continuous glass fibre tube (1), and in the area of the winding head at least one continuous glass fibre tube (1) is wrapped around each winding overhang, wherein the glass fibre tube (1) is surrounded by a woven glass or polyester structure and is filled in particular with a resin which undergoes cross-linkingat room temperature, characterized in that the outer surface of the glass fibre tube (1) is provided with a semi-conducting layer of polymer (6) which permits resin to be injected into the glass fibre tube (1) after the tube has been wrapped around adjacent upper or lower rods (2).
2. A high tension winding according to Claim 1, characterized in that the polymer coating (6) is a layer of silicone containing silicon carbide.
3. A high-tension winding according to Claim 1 or 2, characterized in that the semi-conducting polymer coating (6) is subdivided at the circumference of the glass fibre tube (1) by non-conducting sections (5).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA1808/92 | 1992-09-10 | ||
| AT180892A AT399790B (en) | 1992-09-10 | 1992-09-10 | HIGH VOLTAGE WINDING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2144046A1 true CA2144046A1 (en) | 1994-03-17 |
Family
ID=3521417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2144046 Abandoned CA2144046A1 (en) | 1992-09-10 | 1993-09-09 | High-voltage winding |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0659307B1 (en) |
| JP (1) | JPH08501437A (en) |
| CN (1) | CN1033678C (en) |
| AT (1) | AT399790B (en) |
| BR (1) | BR9307027A (en) |
| CA (1) | CA2144046A1 (en) |
| DE (1) | DE59302528D1 (en) |
| WO (1) | WO1994006194A1 (en) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19547251C2 (en) * | 1995-12-18 | 1999-10-14 | Vem Elektroantriebe Gmbh | Method and device for compressing a winding head insulation of an electrical machine |
| EP1016187B1 (en) | 1996-05-29 | 2003-09-24 | Abb Ab | Conductor for high-voltage windings and a rotating electric machine comprising a winding including the conductor |
| SK164098A3 (en) | 1996-05-29 | 1999-06-11 | Asea Brown Boveri | Transformer/reactor |
| EP1016186A1 (en) * | 1996-05-29 | 2000-07-05 | Abb Ab | A device in the stator of a rotating electric machine |
| SE510192C2 (en) | 1996-05-29 | 1999-04-26 | Asea Brown Boveri | Procedure and switching arrangements to reduce problems with three-tier currents that may occur in alternator and motor operation of AC machines connected to three-phase distribution or transmission networks |
| JP2000511337A (en) | 1996-05-29 | 2000-08-29 | アセア ブラウン ボヴェリ エービー | Insulated conductor for high voltage winding and method of manufacturing the same |
| SE509072C2 (en) | 1996-11-04 | 1998-11-30 | Asea Brown Boveri | Anode, anodizing process, anodized wire and use of such wire in an electrical device |
| SE510422C2 (en) | 1996-11-04 | 1999-05-25 | Asea Brown Boveri | Magnetic sheet metal core for electric machines |
| SE515843C2 (en) | 1996-11-04 | 2001-10-15 | Abb Ab | Axial cooling of rotor |
| SE512917C2 (en) | 1996-11-04 | 2000-06-05 | Abb Ab | Method, apparatus and cable guide for winding an electric machine |
| SE9704421D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Series compensation of electric alternator |
| SE508544C2 (en) | 1997-02-03 | 1998-10-12 | Asea Brown Boveri | Method and apparatus for mounting a stator winding consisting of a cable. |
| SE9704427D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Fastening device for electric rotary machines |
| SE9704432D0 (en) * | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Stator winding pickup device in a rotary electrical machine with such pickup device |
| SE508543C2 (en) | 1997-02-03 | 1998-10-12 | Asea Brown Boveri | Coiling |
| SE9704431D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Power control of synchronous machine |
| SE9704423D0 (en) | 1997-02-03 | 1997-11-28 | Asea Brown Boveri | Rotary electric machine with flushing support |
| SE512952C2 (en) * | 1997-09-30 | 2000-06-12 | Abb Ab | Method and apparatus for grounding a rotating electric machine, as well as a rotating electric machine |
| GB2331867A (en) | 1997-11-28 | 1999-06-02 | Asea Brown Boveri | Power cable termination |
| GB2331869A (en) * | 1997-11-28 | 1999-06-02 | Asea Brown Boveri | Electrical contact of semi-conductive layer of HV cable |
| HUP0101186A3 (en) | 1997-11-28 | 2002-03-28 | Abb Ab | Method and device for controlling the magnetic flux with an auxiliary winding in a rotaing high voltage electric alternating current machine |
| DE19860413A1 (en) | 1998-12-28 | 2000-06-29 | Abb Research Ltd | Reinforced, pressure-resistant hose for mechanical winding head support of rotating electrical machines |
| US7855517B2 (en) | 2005-04-18 | 2010-12-21 | Freescale Semiconductor, Inc. | Current driver circuit and method of operation therefor |
| US8395872B2 (en) | 2005-04-18 | 2013-03-12 | Freescale Semiconductor, Inc. | Current driver circuit and method of operation therefor |
| JP4535146B2 (en) * | 2008-02-27 | 2010-09-01 | 株式会社デンソー | Coil fixing member and rotating electric machine |
| JP5432806B2 (en) * | 2010-04-06 | 2014-03-05 | 株式会社デンソー | Rotating electric machine stator and rotating electric machine |
| US8907540B2 (en) | 2011-11-18 | 2014-12-09 | Remy Technologies, L.L.C. | Electric machine with insulator spacer |
| CN110144743B (en) * | 2019-06-05 | 2021-08-03 | 南通东泰电工器材有限公司 | Conformal rope for assembling end part of large-scale steam turbine generator |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2436306A (en) * | 1945-06-16 | 1948-02-17 | Westinghouse Electric Corp | Corona elimination in generator end windings |
| AT225781B (en) * | 1961-02-07 | 1963-02-11 | Bbc Brown Boveri & Cie | Method for producing a device on electrical machines for supporting and spacing the coil heads and device for carrying out the method |
| CH466415A (en) * | 1967-12-05 | 1968-12-15 | Bbc Brown Boveri & Cie | Device to prevent glow discharges between two insulated conductors of different potential, especially in rotating machines |
| US3949257A (en) * | 1975-01-23 | 1976-04-06 | Westinghouse Electric Corporation | End winding conductor securing arrangement |
| US4196464A (en) * | 1978-02-23 | 1980-04-01 | Eaton Corporation | Semi-conductive layer-containing reinforced pressure hose and method of making same |
| SE415423B (en) * | 1978-12-08 | 1980-09-29 | Asea Ab | ROTATING AC AC MACHINE WITH PRESSURE HOSE STATOR REVERSE |
-
1992
- 1992-09-10 AT AT180892A patent/AT399790B/en not_active IP Right Cessation
-
1993
- 1993-09-09 CA CA 2144046 patent/CA2144046A1/en not_active Abandoned
- 1993-09-09 BR BR9307027A patent/BR9307027A/en not_active Application Discontinuation
- 1993-09-09 DE DE59302528T patent/DE59302528D1/en not_active Revoked
- 1993-09-09 WO PCT/AT1993/000141 patent/WO1994006194A1/en not_active Application Discontinuation
- 1993-09-09 JP JP6506662A patent/JPH08501437A/en active Pending
- 1993-09-09 EP EP93918771A patent/EP0659307B1/en not_active Revoked
- 1993-09-10 CN CN 93117673 patent/CN1033678C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085021A (en) | 1994-04-06 |
| BR9307027A (en) | 1999-06-29 |
| DE59302528D1 (en) | 1996-06-13 |
| JPH08501437A (en) | 1996-02-13 |
| EP0659307A1 (en) | 1995-06-28 |
| AT399790B (en) | 1995-07-25 |
| ATA180892A (en) | 1994-11-15 |
| CN1033678C (en) | 1996-12-25 |
| EP0659307B1 (en) | 1996-05-08 |
| WO1994006194A1 (en) | 1994-03-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |