Feasibility study of capacitance based quench detection technique for HTS power transmission cables

Abstract 2 nd Generation High Temperature Superconducting (2G HTS) tapes are replacing the conventional Low (LTS) wires in various felds of applied superconductivity, especially power transmission applications. Transients electrical grid can result loss superconductivity leading to thermal runaway. This phenomenon is known as quench. To avoid catastrophic consequences, timely detection quench imperative. However, HTS materials possess a low Normal Zone Propagation Velocity (NZPV) compared LTS during property combined with electromagnetic shielding makes voltage tap technique unreliable for cables. A capacitance based proposed and its feasibility studied. variation permittivity cryogenic fuid dielectric be observed association heat generation faults. refected measured between cryostat cable former. In this study, computed using FEM model operating at temperatures along diferent vapour liquid ratios cryogen. The results work extended into experiments