| 摘要 |
1. A power transformer or inductor in a power generation, transmission or distribution system comprising at least one winding (31, 41), characterized in that the winding at least partly is made up by a flexible conductor having electric field containing means (38, 48) and that the cross section area of said flexible conductor varies along at least a part of the length of said flexible conductor. 2. A power transformer or inductor according to claim 1, characterized in that the flexible conductor is made up by a cable (38, 48) comprising a conductor (24), a first layer (25) having semiconducting properties, a solid insulation layer (26) provided around said first layer and a second layer (27) having semiconducting properties provided around said solid insulating layer. 3. A power transformer or inductor according to claim 1 or 2, characterized in that said cross section area of the flexible conductor or cable (50c; 50d) varies continuously along at least a part of the length of said flexible conductor or cable. 4. A power transformer or inductor according to claim 1 or 2, characterized in that said cross section area of the flexible conductor or cable (50a, 50b) varies step-wise along at least a part of the length of said flexible conductor or cable. 5. A power transformer or inductor according to any of claims 1-4, characterized in that the electric stress in the flexible conductor or cable (38, 48) is in principal constant throughout the length of said flexible conductor or cable. 6. A power transformer according to any of claims 1-5, characterized in that the power transformer comprises three phases which are Y connected. 7. A power transformer according to any of claims 1-5, characterized in that the power transformer comprises three phases which are Δ connected. 8. A power transformer or inductor according to any of the claims 1-6, characterized in that one end of at least one winding is at ground potential. |
