Power cable

A power cable comprising:

• a conductor;
• an inner semiconductive layer configured to surround the conductor;
• an insulation layer configured to surround the inner semiconductive layer and including an inner insulation layer, an intermediate insulation layer and an outer insulation layer, which are sequentially stacked one above another;
• an outer semiconductive layer configured to surround the insulation layer;
• a metal sheath layer configured to surround the outer semiconductive layer;
• and
• a cable protecting layer configured to surround the metal sheath layer,
• wherein each of the inner insulation layer and the outer insulation layer is formed of Kraft paper impregnated with an insulation oil, the intermediate insulation layer is formed of a semi-synthetic paper impregnated with the insulation oil, and the semi-synthetic paper includes a plastic film and Kraft paper stacked on at least one surface of the plastic film,
• wherein the inner insulation layer has a thickness ranging from 1% to 10% of an entire thickness of the insulation layer, the intermediate insulation layer has a thickness equal to or greater than 75% of the entire thickness of the insulation layer, and the outer insulation layer has a thickness ranging from 5% to 15% of the entire thickness of the insulation layer,
• wherein the inner insulation layer and the outer insulation layer have a resistivity lower than a resistivity of the intermediate insulation layer,
• wherein the thickness of the outer insulation layer ranges from 1.5 times to 30 times the thickness of the inner insulation layer, and
• wherein the Kraft paper in the inner insulation layer and the outer insulation layer has a thickness greater than a thickness of the Kraft paper in the semi-synthetic paper.