Dc transformer/reactor
OwnerMats Leijon, Udo Fromm +3inventors
InventorsMATS LEIJON, UDO FROMM, ALBERT JAKSTS, MING LI, CHRISTIAN SASSE
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Abstract
The present invention relates to a DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding. The winding comprises at least one current-carrying conductor. Each winding comprises also an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.
Claims30
A DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding, characterized in that the winding comprises at least one current-carrying conductor and each winding comprises an insulation system, which comprises on the one hand at least two semiconducting layers, wherein each layer constitutes substantially an equipotential surface, and on the other hand between them is arranged a solid insulation.
A DC transformer/reactor according to any of the previous claims, characterized in that the current-carrying conductor comprises a number of strands, only a minority of the strands being non-isolated from each other.
A DC transformer/reactor according to any one of the preceding claims, characterized in that each of said two layers and said solid insulation is fixed connected to adjacent layer or solid insulation along substantially the whole connecting surface.
A DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding, characterized in that the winding comprises a cable (1) comprising at least one current-carrying conductor (2),
- each conductor (2) comprises a umber of strands,
- around said conductor (2) is arranged an inner semiconducting layer (3),
- around said conductor (2) is arranged an inner semiconducting layer (3),
- around said inner semiconducting layer (3) is arranged an insulating layer (4) of solid insulation, and
- around said insulating layer (4) is arranged an outer semiconducting layer (5).
A DC transformer/reactor comprising a magnetic circuit, wherein the magnetic circuit comprises a magnetic core and at least one winding, characterized in that the winding comprises at least one current-carrying conductor, and also comprising an insulation system, which in respect of its thermal and electrical properties permits a voltage level in said HVDC transformer/reactor exceeding 36 kV.
Dependencies are inferred from the claim text.