DC O.F. POWER CABLE

摘要

PROBLEM TO BE SOLVED: To provide a DC O.F.(oil-filled) power cable capable of suppressing deterioration in its performance if a void is formed directly on a conductor or directly under a metallic sheath due to a change in temperature. SOLUTION: This DC O.F. power cable is equipped with an insulation layer 3 on the periphery of the conductor 1. Plastic laminate paper made by bonding low-ρ(resistivity) kraft paper to at least one side of a plastic film is used as the layer 3. The low-ρkraft paper is obtained by givingρ-lowering treatment to insulating kraft paper, and it has an insulation resistance not less than 10% and not more than 80% of that of kraft paper not yet given the treatment. An addition of dicyandiamide is mentioned as a method of the treatment. By lowering the insulation resistance of kraft paper by the treatment, the initiation of discharge in the void can be inhibited.