Power cable

A power cable comprising:

• a conductor;
• an inner semi-conductive layer covering the conductor;
• an insulating layer covering the inner semi-conductive layer and impregnated with an insulating oil;
• an outer semi-conductive layer covering the insulating layer;
• a metal sheath layer covering the outer semi-conductive layer;
• and
• a cable protective layer covering the metal sheath layer,
• wherein the insulating layer is formed by sequentially stacking an inner insulating layer, an intermediate insulating layer, and an outer insulating layer,
• wherein the inner insulating layer and the outer insulating layer are formed by cross-winding kraft paper by gap winding and impregnating the kraft paper with the insulating oil,
• the intermediate insulating layer is formed by cross-winding semi-synthetic paper by gap winding and impregnating the semi-synthetic paper with the insulating oil, the semi-synthetic paper including a plastic film and kraft paper stacked on at least one side of the plastic film,
• the gap winding is performed by cross-winding a kraft paper or semi-synthetic paper to form regular gaps between the widths of the kraft paper or semi-synthetic paper, and repeatedly cross-winding a new kraft paper or semi-synthetic paper on the kraft paper or semi-synthetic paper to cover the gaps with the new kraft paper or semi-synthetic paper while gaps are formed between the widths of the new kraft paper or semi-synthetic paper,
• the intermediate insulating layer is divided into at least two layers according to a width of the semi-synthetic paper thereof, wherein, when a layer more adjacent to the conductor among the at least two layers is a lower layer and a layer located at an outer side of the lower layer is an upper layer, the width of the semi-synthetic paper forming the upper layer is greater than that of the semi-synthetic paper forming the lower layer, and
• a width of the gaps between the widths of the semi-synthetic paper, which are formed by gap-winding the semi-synthetic paper, is 5 to 15% of that of the semi-synthetic paper.