Patent EA-001488-B1 (EA)
Title: Rotating electrical machine plants
Inventor: LEIJON MTS
IPC: H02K3/40
Filed: 1997-05-27
Abstract: 1. An installation within the power range of 1 MW to 15 GW comprising a rotating single-winding/multiple-winding machine and a converter, characterized in that the machine is a high-voltage machine and comprises a magnetic circuit with one or more magnetic cores and one or more windings phase-shifted in space, and in that the windings comprise one or more current-carrying conductors (2), and around each conductor there is arranged a first layer (3) with semiconducting properties, and around the first layer there is arranged a solid insulating layer (4), and that around the insulating layer there is arranged a second layer (5) with semiconducting properties and that mechanical torque is converted into direct high voltage current and direct voltage via the converter without intermediate transformers and/or reactors. 2. An installation according to claim 1, characterized in that the converter comprises semiconductor devices which are connected and function as an AC/DC converter. 3. An installation within the power range of 1 MW to 15 GW comprising a rotating single-winding/multiple-winding machine and a converter, characterized the machine is a high-voltage machine and comprises a magnetic circuit with one or more magnetic cores and one or more windings phase-shifted in space, and in that the windings comprise one or more current-carrying conductors (2), and around each conductor there is arranged a first layer (3) with semiconducting properties, and around the first layer there is arranged a solid insulating layer (4), and that around the insulating layer there is arranged a second layer (5) with semiconducting properties and that high voltage direct current and direct voltage are converted via the converter into a mechanical torque without intermediate transformers and/or reactors. 4. An installation according to claim 3, characterized in that the converter comprises semiconductor devices which are connected and function as a DC/AC converter. 5. An installation according to claims 1 and 2, characterized in that to the AC/DC rectifier there is connected a DC/AC inverter with direct connection to an ac network without intermediate transformers. 6. An installation according to claims 3 and 4, characterized in that to the dc side of the DC/AC inverter there is connected a DC/AC rectifier with direct connection to an ac network without intermediate transformers. 7. An installation according to claims 2 and 4, characterized in that to the semiconductor devices may consist of thyristors, diodes, triacs, gate turn-off thyristors (GTO), bipolar transistors (BJT), PWM transistors, MOSFET, insulated gate bipolar transistors (IGBT), static induction transistors (SIT), static induction thyristors (SITH), MOS-controlled thyristors (MCT) and similar components with semiconductor properties. 8. An installation according to claims 1, 2, 3 and 4, characterized in that the converters constitute an integral part of the rotating high-voltage single-winding/multiple-winding machine. 9. An installation according to claims 1, 2 and 5, characterized in that the converters constitute an integral part of the rotating high-voltage single-winding/multiple-winding machine. 10. An installation according to claims 1, 2 and 6, characterized in that the converters constitute an integral part of the rotating high-voltage single-winding/multiple-winding machine. 11. An installation according to claims 1, 2 and 5, characterized in that the rotating high-voltage single-winding/multiple-winding machine and the semiconductor devices have a common cooling system. 12. An installation according to claims 1, 2 and 6, characterized in that the rotating high-voltage single-winding/multiple-winding machine and the semiconductor devices have a common cooling system. 13. An installation according to claims 1, 2 and 5, characterized in that the rotating high-voltage single-winding/multiple-winding machine and the semiconductor devices have the same and common ground connection. 14. An installation according to claims 1, 2 and 6, characterized in that the rotating high-voltage single-winding/multiple-winding machine and the semiconductor devices have the same and common ground connection. 15. A rotating single-winding/multiple-winding machine according to claim 1 or 3, characterized in that the first layer (3) is at substantially the same potential as the conductor. 16. A rotating single-winding/multiple-winding machine according to claim 1, 3 or 15, characterized in that the second layer (5) is arranged in such a way that it constitutes an equipotential surface surrounding the conductor/conductors. 17. A rotating single-winding/multiple-winding machine according to claim 1, 3 or 15, characterized in that the second layer (5) is connected to ground potential. 18. A rotating single-winding/multiple-winding machine according to claim 1, 3, 15, 16 or 17, characterized in that, for the winding, all the semiconducting layers and insulating layers exhibit similar thermal properties, such that, upon a thermal movement in the winding, no defects, cracks, or the like, occur in the insulating parts. 19. A rotating single-winding/multiple-winding machine according to claim 1, 3 or 15, characterized in that the current-carrying conductor comprises a number of strands, whereby only a small number of the strands are non-insulated from each other. 20. A rotating single-winding/multiple-winding machine wherein the magnetic circuit comprises a magnetic core and one or more windings phase-shifted in space, characterized in that the windings comprise a cable including one or more current carrying conductors (2), that each conductor comprises a number of strands, that around each conductor there is arranged an inner semiconducting layer (3), around which there is arranged an insulating layer (4) of solid insulation, around which there is arranged an outer semiconducting layer (5). 21. A rotating single-winding/multiple-winding machine with a magnetic circuit according to claim 20, characterized in that the cable also comprises a metal shield and a sheath. 22. A rotating single-winding/multiple-winding machine according to claim 20, characterized in that the magnetic circuit is arranged in the stator and/or the rotor of the rotating electric machine. 23. A rotating single-winding/multiple-winding machine according to claim 20, characterized in that the outer semiconducting layer (5) is cut off into a number of parts which are separately connected to ground potential. 24. A rotating single-winding/multiple-winding machine according to claim 20, 21, 22 or 23 characterized in that with connection of the outer semiconducting layer to ground potential, the electric field of the machine outside the semiconducting layer both in the slots and in the coil-end region will be near zero. 25. A rotating single-winding/multiple-winding machine according to claims 20 and 21, characterized in that, when the cable comprises several conductors, these are transposed. 26. A rotating single-winding/multiple-winding machine with a magnetic circuit according to claim 20, characterized in that the current-carrying conductor/conductors (2) comprise both non-insulated and insulated wires, stranded into a number of layers. 27. A rotating single-winding/multiple-winding machine with a magnetic circuit according to claim 20, characterized in that the current-carrying conductor/conductors (2) comprise both non-insulated and insulated strands, transposed into a number of layers. 28. A rotating single-winding/multiple-winding machine with a magnetic circuit according to claim 20, characterized in that the slots (10) are formed as a number of cylindrical openings (12), extending axially and radially outside one another, with a substantially circular cross section separated by a narrower waist portion (13) between the cylindrical openings. 29. A rotating single-winding/multiple-winding machine with a magnetic circuit according to claims 20 and 28, characterized in that the substantially circular cross section of the cylindrical openings (12) of the slots, counting from a back portion (8) of the laminated core, is designed with a continuously decreasing radius. 30. A rotating single-winding/multiple-winding machine with a magnetic circuit according to claims 20 and 28, characterized in that the substantially circular cross section of the cylindrical openings (12) of the slots, counting from a back portion (8) of the laminated core, is designed with a discontinuously decreasing radius. 31. A rotating single-winding/multiple-winding machine characterized that the machine is a high-voltage machine and comprises a magnetic circuit with one or more magnetic cores and one or more windings phase-shifted in space, and in that the windings comprise one or more current-carrying conductors (2), and around each conductor there is arranged a first layer (3) with semiconducting properties, and around the first layer there is arranged a solid insulating layer (4), and that around the insulating layer there is arranged a second layer (5) with semiconducting properties and in that the magnetic core is formed with salient poles. 32. A rotating single-winding/multiple-winding machine, characterized in that that the machine is a high-voltage machine and comprises a magnetic circuit with one or more magnetic cores and one or more windings phase-shifted in space, and in that the windings comprise one or more current-carrying conductors (2), and around each conductor there is arranged a first layer (3) with semiconducting properties, and around the first layer there is arranged a solid insulating layer (4), and that around the insulating layer there is arranged a second layer (5) with semiconducting properties and that the machine is air-gap-wound. 33. A rotating single-winding/multiple-winding machine according to claim 32, characterized in that the air-gap flux is radial. 34. A rotating single-winding/multiple-winding machine according