Power cable

A power cable to be provided inside a steel pipe that is electrically connected to a reference potential node, the power cable comprising:

• three transmission cables respectively including one of three conductor wires configured to transmit 3-phase alternating current power, an insulating layer covering the one of the three conductor wires, and a semiconductive layer covering the insulating layer and forming an outer peripheral surface of one of the three transmission cables, wherein the three transmission cables are arranged at three-fold rotationally symmetrical positions with respect to a center of the three transmission cables in a cross sectional view in a state in which the semiconductive layers of adjacent transmission cables of the three transmission cables make contact with each other, and wherein the cross sectional view is taken in a direction perpendicular to a longitudinal direction of the power cable;
• three ground buses respectively having an outer peripheral surface that is made of a conductor and is in direct contact with the outer peripheral surfaces of two adjacent transmission cables of the three transmission cables, and arranged at three-fold rotationally symmetrical positions with respect to the center of the three transmission cables in the cross sectional view;
• a binder made of an insulator and in direct contact with and covering both the outer peripheral surfaces of the three ground buses and the outer peripheral surfaces of the three transmission cables;
• and
• a jacket made of an insulator and in direct contact with an outer peripheral surface of the binder to overlap the binder,
• wherein the three transmission cables have outer diameters so as to inscribe a first circle that has a radius in the cross sectional view corresponding to a radius of a second, envelope circle of the power cable having a maximum radius inside the steel pipe, but excluding thicknesses of the binder and the jacket, and
• wherein the three ground buses have outer diameters such that the three ground buses project in a radial direction from the center, outwardly of an envelope closed curve of the three transmission cables surrounding the outer peripheral surfaces of the three transmission cables in the cross sectional view, but the outer diameters of the three ground buses are less than or equal to a diameter of the first circle.