Power cable system having different conductor connecting part

A power cable system comprising a cable connection part in which a first power cable and a second power cable are connected, the power cable system comprising:

• a first conductor constituting the first power cable, made of copper or a copper alloy material;
• a second conductor constituting the second power cable, the second conductor being made of aluminum or an aluminum alloy material different from the first conductor;
• and
• a different conductor connecting part, wherein the first conductor and the second conductor are bonded by resistance welding,
• wherein the different conductor connecting part includes an intermetallic compound layer formed as a result of a material migration phenomenon at bonding surfaces of the first conductor and the second conductor, and
• wherein an average thickness of the intermetallic compound layer is greater than 2.5 μm and less than or equal to 10 μm, which is a critical average thickness at which brittle fracture occurs in a tensile test,
• wherein the average thickness of the intermetallic compound layer is measured as an average of thicknesses of the intermetallic compound layer at a center point, an outermost point, and a quarter midpoint between the center point and the outermost point of the bonding surface of the first conductor and the second conductor.