Normal zone propagation experiments on HTS composite conductors

• Published in: Cryogenics (Guildford) Vol. 43; no. 3; pp. 271 - 279
• Main Authors: Trillaud, F, Palanki, H, Trociewitz, U.P, Thompson, S.H, Weijers, H.W, Schwartz, J
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.03.2003; Elsevier
• Subjects: Applied sciences; Bi-2223/Ag; Electric connection. Cables. Wiring; Electrical engineering. Electrical power engineering; Exact sciences and technology; Local heat disturbance; Normal zone propagation velocity; Quench energy; Resistive heater; Various equipment and components; YBCO coated conductors; Normal zone propagation velocity; Quench energy; YBCO coated conductors; Bi-2223/Ag; Local heat disturbance; Resistive heater; Performance evaluation; Powder in tube technique; Propagation velocity; Heating element; System design; Experimental study; Coatings; Composite material; Coated material; Surface treatment; Superconducting cable; Electrical conductor; Composite superconductor; High temperature superconductor
• ISSN: 0011-2275; 1879-2235
• DOI: 10.1016/S0011-2275(03)00044-4

As high temperature superconductor magnet applications become a reality due to increases in conductor performance, it is important to understand the behavior of normal zones in conductors and magnets in order to design safe magnet systems. Here we study the effects of localized heat pulses in Ag-alloy sheathed Bi 2Sr 2Ca 2Cu 3O x powder-in-tube conductors and Ni-alloy substrated YBa 2Cu 3O x coated conductor tapes cooled by N 2 gas. A heater was used to initiate a normal zone. The experimental setup to measure the energy required such that the normal zone propagates and the normal zone propagation velocity in the longitudinal direction is described. Results for both conductor architectures are presented.