A SOLID DIRECT CURRENT (DC) TRANSMISSION SYSTEM COMPRISING A LAMINATED INSULATION LAYER AND METHOD OF MANUFACTURING

摘要

The invention relates to a direct current transmission system (1) comprising a conductor layer (2), an inner semiconductive layer (3) covering the conductor layer. An insulation layer is provided on the outer circumference of the semiconductive layer comprising laminated insulation material. The insulation material comprises an inner part (4) from a first radial distance (r0) at a semi-conductive layer/insulation layer interface, and a main part (5) covering the inner part from initial distance (eta) to maximum distance (rd), and having midd le rad ial d istance (rm). An outer semiconductive layer (7) covers the insulation layer. The laminated insulation material comprises a thickness gradient. The thickness gradually increases in the radial direction from the first radial distance. The insulation layer may further comprise an outer part (6) circumferentially covering the main part and comprising laminated insulation material having substantially the same thickness as the laminated insulation material in the inner part.