Hydro-generator plant
First Claim
1. A hydrogenerator plant for connection to a high voltage transmission or distribution network comprising:
- at least one rotating electric machine for high voltage coupled to a turbine via shaft means, said electric machine comprising at least one winding formed of a conductor including a plurality of insulated conductive elements, and at least one uninsulated conductive element;
a covering surrounding the conductor including an inner layer having semiconducting properties, a solid insulating layer surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulating layer, said inner layer being in contact with the uninsulated element such that the inner layer has the same potential as the conductor, and said at least one winding being directly connectable to the transmission or distribution network, the voltages being across a range of transmission or distribution voltages.
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Accused Products
Abstract
The magnetic circuit of a generator in a hydro-generator plant is arranged to directly supply a high supply voltage of 20-800 kV, preferably higher than 36 kV. The generator is provided with solid insulation and its winding includes a cable (6) comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by at least one outer and one inner semiconducting layer (34, 32) and intermediate insulating layers (33). The outer semiconducting layer (34) is at earth potential. The stator winding may be produced with full or fractional slot winding, the phases of the winding being Y-connected. The Y-point may be insulated and protected from over-voltage by means of surge arresters, or else the Y-point may be earthed via a suppression filter. The invention also relates to a hydro-generator plant, a generator included in the plant and a procedure for building such a plant.
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Citations
35 Claims
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1. A hydrogenerator plant for connection to a high voltage transmission or distribution network comprising:
- at least one rotating electric machine for high voltage coupled to a turbine via shaft means, said electric machine comprising at least one winding formed of a conductor including a plurality of insulated conductive elements, and at least one uninsulated conductive element;
a covering surrounding the conductor including an inner layer having semiconducting properties, a solid insulating layer surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulating layer, said inner layer being in contact with the uninsulated element such that the inner layer has the same potential as the conductor, and said at least one winding being directly connectable to the transmission or distribution network, the voltages being across a range of transmission or distribution voltages. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
- at least one rotating electric machine for high voltage coupled to a turbine via shaft means, said electric machine comprising at least one winding formed of a conductor including a plurality of insulated conductive elements, and at least one uninsulated conductive element;
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31. An electric generator for a high voltage included in a hydro-generator plant in which the generator is coupled to a turbine via shaft means, said generator comprising at least one winding including a conductor, a solid insulation covering including an inner layer having semiconducting properties;
- a solid insulating layer surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulation layer;
said conductor formed of a plurality of conductive elements including at least one uninsulated element in contact with the inner layer and a plurality of insulated elements; and
wherein each winding is directly connectable to a high voltage transmission or distribution network, and the inner layer forms an equipotential surface about the conductor.
- a solid insulating layer surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulation layer;
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32. A hydrogenerator plant including a rotating high voltage electric machine comprising a stator;
- a rotor and a winding, wherein said winding comprises a cable including a current-carrying conductor and a magnetically permeable, electric field confining cover surrounding the conductor, the cover including an inner layer having semiconducting properties, a solid insulation surrounding the inner layer and an outer layer having semiconducting properties surrounding the solid insulation, said cable forming at least one uninterrupted turn in the corresponding winding of said machine, and wherein the conductor includes a plurality of insulated conductive strands and at least one uninsulated electrically conductive strand in contact with the inner layer, such that said conductor and inner layer are at the same potential.
- View Dependent Claims (33, 34)
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35. A hydrogenerator plant for direct connection to a high voltage transmission or distribution network comprising:
- at least one rotating electric machine for high voltage coupled to a turbine via shaft means, said electric machine including at least one winding comprising a conductor and a magnetically permeable, electric field confining insulating covering surrounding the conductor including an inner layer having semiconducting properties, a solid insulation surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulating layer, said conductor including at least one of a plurality of insulated conductive elements, and at least one uninsulated conductive element being in contact with the inner layer such that said conductor and inner layer are at the same potential; and
said at least one winding being directly connectable to the transmission or distribution network.
- at least one rotating electric machine for high voltage coupled to a turbine via shaft means, said electric machine including at least one winding comprising a conductor and a magnetically permeable, electric field confining insulating covering surrounding the conductor including an inner layer having semiconducting properties, a solid insulation surrounding the inner layer and an outer layer having semiconducting properties surrounding the insulating layer, said conductor including at least one of a plurality of insulated conductive elements, and at least one uninsulated conductive element being in contact with the inner layer such that said conductor and inner layer are at the same potential; and
Specification