Effect of partial insulation winding scheme on discharge characteristics of GdBCO coils

Synergic realization of electrical insulation and mechanical strength in liquid nitrogen for high-temperature superconducting tapes with ultra-thin acrylic resin coating

“…no-insulation (NI) coils), some insulation characteristics are desired and it is necessary to carry out postprocessing on commercial REBCO tapes. For example, in NI coils, the turn-to-turn resistance has a significant impact on the performance [7][8][9]. In order to improve the turn-to-turn resistance and reduce the charge-discharge delay of the coils, various post-processing techniques are proposed, such as coating silicon grease on the surface of REBCO tapes, depositing nickel coating, and co-winding with stainless steel (SS) or brass, etc [8][9][10].…”

“…For example, in NI coils, the turn-to-turn resistance has a significant impact on the performance [7][8][9]. In order to improve the turn-to-turn resistance and reduce the charge-discharge delay of the coils, various post-processing techniques are proposed, such as coating silicon grease on the surface of REBCO tapes, depositing nickel coating, and co-winding with stainless steel (SS) or brass, etc [8][9][10]. In addition, REBCO tapes are usually wrapped with Kapton TM films in superconducting current limiters and superconducting wind-mill for insulation.…”

Transverse pressure effect on superconducting Nb3Sn Rutherford and ReBCO Roebel cables for accelerator magnets

“…Earlier literature on the electrical tape-to-tape resistance in coated conductors mainly focused on soldered or welded lap joints that are needed for current leads or to extend the length of magnet windings [187][188][189][190][191][192][193][194][195]. However, recent interest in no-insulation pancake-or racetracktype coils for stationary applications [196][197][198][199][200] as well as the steady development of various ReBCO cable types [100,102,[201][202][203][204] has raised the question of how the direct contact resistance between two tapes, i.e. the electrical resistance without intermediate soldering or welding layer, is influenced by the internal layout of the coated conductor and by external factors such as temperature, transverse pressure or surface condition.…”