ULTRA-HIGH VOLTAGE POWER

PURPOSE: To thin the thickness of a molded insulator by providing an insulator with an inner layer of high density polyethylene to which no filler is added and providing the high density polyethylene with higher electric strength than the rest of the neighboring insulator. CONSTITUTION: A cable core wire comprises center stranded wires 1, a semiconductor screen layer 2 formed on the stranded wires, an insulator 3 formed on the screen layer, and a semiconductor screen layer 4 formed on the formed insulator 3. The formed insulator 3 comprises an inner layer 5 and an outer layer 6 and the inner layer 5 has higher electric strength than the substance of the outer layer 6. Consequently, the thickness of the whole body of the formed insulator is significantly thinned.