Power cable system having different conductor connecting part
The present disclosure relates to a power cable system capable of determining the possibility of brittle fracturing of a different conductor connecting part of power cables due to tensile force applied to the different conductor connecting part, the power cable system comprising: a first conductor constituting a first power cable; a second conductor constituting a second power cable; and the different conductor connecting part formed by bonding the first conductor and the second conductor by means of resistance welding, wherein the average thickness of an intermetallic compound layer formed on the bonding surface of the different conductor connecting part is 10 μm or less, which is the critical average thickness at which a brittle fracture occurs during a tensile test.
1 . 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.
2 . The power cable system of claim 1 , wherein the intermetallic compound layer includes at least one of an Al 2 Cu layer, an AlCu layer, an Al 2 Cu 3 layer, and an Al 4 Cu 9 layer.
3 . The power cable system of claim 1 , wherein a cross-sectional area of the conductor at the connecting part of the first conductor and the second conductor is equal to or greater than 800 mm 2 .
4 . The power cable system of claim 1 , wherein the first conductor and the second conductor are circular compressed conductors or flat conductors with a plurality of strands compressed into a circular shape.
5 . The power cable system of claim 4 , wherein the first conductor is bonded with the second conductor in a state where the connecting part is cut to remove voids in the bonding surface after homogeneous conductors are bonded.