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US 6,919,664 B2Granted
High voltage plants with electric motors
AssigneeABB AB
InventorsMats Leijon, Lars Gertmar, Lennart Brandt
Life of this patent
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AssigneeABB AB
InventorsMats Leijon, Lars Gertmar, Lennart Brandt
Estimating the term…
In a plant comprising one or more electric machines constructed with insulated conductors and connected for heavy current via insulated conductors, the magnetic circuit in at least one of these electric machines is connected directly to a high supply voltage of 20-800 kV, preferably higher than 36 kV. The insulation of the electric machine is built up of a cable (6) placed in its winding and comprising one or more current-carrying conductors (31) with a number of strands (36) surrounded by outer and inner semiconducting layers (34, 32) and intermediate insulating layers (33). The conductors (31) may be group-wise connected in parallel and semiconducting layers are therefore not required around every conductor in the group. If the conductors (31) are connected in series with each other within the group a part insulation (35) is required which will withstand a few kV, whereas connection of the conductors (31) to every phase requires a strong part insulation (35) which will withstand the phase voltage of the high-voltage supply network.
An electric plant for high voltage including one or more motors, each comprising at least one flexible winding, wherein the winding of at least one of the electric motors forms at least one complete uninterrupted turn, said wincing comprising an electrical conductor including a plurality of insulated conductive elements and at least one uninsulated conductive element;
A plant for high voltage electric including a motor including at least one flexible winding, wherein said winding comprises a cable including as least one current-carrying conductor and a magnetically permeable, electric field confining cover surrounding the conductor including an inner layer of semiconducting material surrounding the conductor, a solid insulating layer surrounding the inner layer, and an outer layer of semiconducting material surrounding the insulating layer, the conductor including a plurality of insulated conductive elements and at least one uninsulated conductive element in contact with the inner layer, said cable forming at least one uninterrupted turn in the corresponding winding of said machine.
An electric plant for high voltage including at least one motor comprising at least on flexible winding in the form of at least one uninterrupted turn, the winding including an electrical conductor including a plurality of insulated conductive elements and at least one uninsulated conductive element, a magnetically permeable electric field confining insulating covering the conductor including an inner semiconducting layer surrounding and being in electrical contact with the at least one uninsulated conductive element;
An electric plant for high voltage including at least one motor comprising at least one flexible winding, including an electrical conductor including a plurality of uninsulated conductive elements and at least one uninsulated conductive element, said conductor forming at least one complete turn of the winding, an electric field confining insulating covering surrounding the conductor including an inner semiconducting layer in electrical contact with the at least one uninsulated conductive element;
Dependencies are inferred from the claim text.