Lateral critical current density distributions degraded near edges of coated conductors through cutting processes and their influence on ac loss characteristics of power transmission cables

The critical current density (Jc) near the edges of coated conductor could impact the ac loss characteristics of the cables comprising coated conductors. A wide coated conductor is often cut into narrower coated conductors in fabrication processes, and the Jc might degrade near the edges of coated conductors through the cutting process. This possible degradation of Jc could depend on cutting technology. Lateral Jc distributions of coated conductors cut by using a mechanical slitter as well as a laser were measured by the magnetic knife method. The measured coated conductors are fabricated by PLD process on clad type textured-metal substrates with reduced magnetism. Based on the degradation of Jc near the edges of coated conductors which was determined experimentally, ac losses of multi-layer cables as well as mono-layer cables were calculated numerically to evaluate the impact of the Jc degradation near the edges of coated conductors on the their ac loss characteristics.