Study Reveals Current Patterns and AC Loss Mechanisms in CORT Superconducting Cables
Researchers used advanced 2D modeling to investigate how electric current flows through conductor-on-round-tube (CORT) cables carrying alternating current, revealing a complex pattern known as the Garber current distribution. The study examined how cable geometry parameters—including conductor thickness, pitch angle, and spacing between conductors—affect this current pattern and resulting energy losses. Understanding these mechanisms is important for optimizing CORT cable design for compact, efficient AC power transmission applications.
A new study published on arXiv examines the detailed three-dimensional current distribution in CORT cables, which are being developed as compact solutions for AC power transmission. The research reveals that current does not flow uniformly through the superconducting conductors; instead, it follows the Garber current pattern, flowing primarily along the outer surface of conductors in the axial direction and along inner surfaces in the azimuthal direction. Using an effective 2D computational model adapted to the cable's helical structure, researchers investigated how geometric parameters such as conductor thickness, pitch angle, and gaps between adjacent conductors influence this current distribution. The study establishes relationships between current flow patterns and the two dominant sources of AC losses: surface losses from magnetic field penetration parallel to conductor faces, and edge losses from perpendicular field penetration at conductor gaps. These findings challenge simplified modeling approaches that assume straight conductors or infinitely thin layers, offering more accurate predictions for cable performance.
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- arXiv physicsCenter
Current patterns and loss contributions in CORT cables carrying AC current
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