Influence of stabilizer thickness on over-current test of YBCO-coated conductors

Abstract

The increased use of distributed power generation has led to increasingly high fault current levels. A superconducting fault current limiter (SFCL) is a potential solution to prevent the problem of short-circuit currents. YBCO-coated conductors (CCs) are one of the most promising superconducting materials for SFCLs. Most YBCO CCs have stabilizers, which play a significant role in limiting the fault current in the SFCL. Therefore, the selection of the appropriate material and the thickness of the stabilizer of the CC used for the SFCL may affect its quench/recovery characteristics. In this paper, the quench/recovery characteristics of YBCO CC tapes having stabilizers with various thicknesses were investigated. The quench/recovery test results showed that, as the thickness of the stabilizer decreased, both the final approach temperature and the recovery time decreased.

Experimental and numerical analysis of quench propagation on MgB2tapes and pancake coils

“…Most thermal stability studies simulate the behaviour of superconducting systems during a quench fault (transition from the superconducting to the normal state), by applying either local heat pulses [1][2][3][4][5][6] or over-currents [7][8][9][10][11], and analyse the temperature and electric field profiles along the conductor wire and the system. These experiments characterize the local appearance of a quench and its propagation to the overall conductor and determine the minimum quench energy (MQE), the quench propagation velocity (v p ) and the minimum propagation zone (MPZ).…”

A superconducting joint for GdBa2Cu3O7−δ-coated conductors

“…We used a chemical etching method to remove a predetermined length of the stabilizers covering the GdBCO to expose a portion of the bare GdBCO surface without degrading the superconductivity. [19][20][21][22] The ends of two bare GdBCO CCs are overlapped by rotating one CC 1801 (to form a lap-type joint). The exposed portions of the superconducting layers are held together, and pressure is applied.…”

The Effects of External Pressure on the Thermal and Electrical Properties of Stacked GdBCO Coated Conductor Tapes

“…This higher stability is due to their large heat capacities, high operating temperatures, and lower dependence on an external magnetic field for a workable critical current value [1]- [8]. However, HTS magnets wound with 2G HTS tape are unlikely to be self-protecting due to their low normal zone propagation velocity (NZPV), which may lead to permanent damage of the magnets [8]- [14]. In addition, the 2G HTS CC may experience mechanical pressures induced by the magnetic field during the HTS magnet's operation.…”