Effects of Magnetic Fields on Quench Characteristics of Superconducting Tape for Superconducting Fault Current Limiter

Abstract

In DC systems, DC resistive type superconducting fault current limiters (R-SFCLs) can respond within a few hundred milliseconds and limit the fault current to a very low level to protect the power equipment in DC systems. The main part of R-SFCLs are superconducting tapes. When short-circuit faults occur in the system, the superconducting tapes will quench and become a large quenched resistor to limit the fault current. The surrounding magnetic fields and the magnetic fields caused by the superconducting tapes itself influence the quench characteristics of the superconducting tapes of R-SFCLs. Thus, the current limiting characteristics of R-SFCLs will also be affected. Until present, very few studies have investigated the effects of magnetic fields on quench characteristics of superconducting tapes for DC R-SFCL. The objective of this paper is to obtain the effects of magnetic fields on quench characteristics of superconducting tapes for DC R-SFCL. Two different kinds of YBa2Cu3O7-δ (YBCO) tapes are studied under a permanent magnetic field of 0, 42.4, 75.9, 122.9 mT, respectively. One is from Shanghai Superconductor Technology Co., Ltd., Shanghai, China, type ST-12-L (named SC_SH) and the other is from American Superconductor Inc. Boston, MA, USA, type 8602 (named SC_8602). The research results show that the magnetic fields influence both the amplitude and the rising rate of the quenched resistance of an SC_SH tape. Under the same magnetic field, both the speed of quenching and the quenching resistance of SC_SH tape are larger than them of SC_8602 when the prospective current exceeds 800 A. Thus SC_SH tape can limit the fault current faster and to a lower level.

Progress on Second-Generation High-Temperature Superconductor Tape Targeting Resistive Fault Current Limiter Application

“…The YBCO superconducting tapes used in the experiments were produced by SST [39]. Al 2 O 3 /Y 2 O 3 /MgO/LaMnO 3 /CeO 2 /REBCO/Ag layers were successively plated on 50 µm thick 10 mm wide Hastelloy TM substrate.…”

“…Extensive studies have been carried out on testing HTS tapes for resistive fault current limiter application. Llambes et al [25] and Hajdasz et al [26] studied the application of superpower tapes in SFCL; Schmidt et al [27] and Baldan et al [28,29] studied the application of AMSC tapes in SFCL; Ahn et al [30], Park et al [31], and Sheng et al [32] compared the tape structures from different postprocessing treatments in the application of SFCL; Lacroix et al [33,34] developed a novel structure to increase the NZPV (normal zone propagation velocity) of HTS tape during impulse impact; Zhang et al [35] and Liu et al [36] determined the DC overcurrent impact on the tapes at different temperatures and analyzed quench resistance; Sheng et al [37] and Maeda et al [38] studied the quench recovery of the tapes after overcurrent impact and observed the bubbles generated by heat transfer on the tape surface during the quench process; Xiang et al [39] studied the effect of magnetic field on the overcurrent impact of tapes; Rusi ński et al [40] and Jiang et al [41] studied the effect of tape insulation on overcurrent impact; Liang et al [42,43] modeled the quench resistance of the tape through the R-Q curve; LV et al [44] laminated the optical fiber on the side of the tape to measure the temperature during the overcurrent impact process.…”