| 摘要 |
PROBLEM TO BE SOLVED: To provide high mechanical strength and a restrain formation of voids just over a conductor or just under a metallic sheath due to temperature change, by making the paper of craft paper having specific thickness, density, air-tightness, and transverse tensile break strength. SOLUTION: This oil impregnated solid power cable is provided with, in the order from the center, a conductor 1, an inner semi-conductive layer 2 made of carbon paper, an oil impregnated insulating layer 3, an outer semi- conductive layer 4 made of carbon paper, an assignment shielding layer 5, and a cable sheath 6 normally made of polyethylene. The insulating paper used for the oil impregnated insulating layer 3 is preferably made of craft paper with thickness of 30μm to 70μm, density of >=1.0 g/cm3, air-tightness of >5000 Gal sec, and transverse tensile break strength of >=4.0 kgf/mm2. The insulating paper is desirably wound about the entire oil impregnated insulating layer 3, but sheet number of insulating paper increases. Therefore, it is effective that the paper is provided for at least one of the outermost layer and the innermost layer of the oil impregnated insulating layer 3 having high electric field.
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