Investigation of the nanocomposite material YBa2Cu3O7−δ + ZrO2 as a resistive superconducting fault-current limiter

Abstract

The effects of nanoscale inclusions ZrO2 as the second component of the composites on the magnetic and transport properties of superconducting polycrystals YBa2Cu3O7-δ are studied. Samples of YBa2Cu3O7-δ with different (0.5, 4, 8 и 12 wt.%) contents of ZrO2 nanoparticles were synthesized. Measurements of the magnetization in the field range up to 5 T and recalculation using the Bean model showed that JC in the case of composite samples is larger than the initial one in the entire range of the magnetic field. The results of experimental studies of switching superconducting fault-current limiter in AC voltage networks based on high-temperature superconductors (HTSC) of the 2nd generation are given. The stand contains a series-connected HTSC module and a high-speed current switch with a shutdown time of 9 ms. The high efficiency of samples from the nanocomposite material YBa2Cu3O7-δ + ZrO2 as a resistive superconducting fault-current limiter was shown.