The high temperature superconductivity of cuprate superconductors has been discovered in 1986 by J.G.Bednorz and K.A.Muller [1] in the La-Ba-Cu-O system. Soon after this important discovery many other compounds with superconducting transition temperature T_c higher than the boiling point of liquid nitrogen, have been synthesised. However at present, in spite of their high T_c, the use of High-T_c Superconductor (HTS) for commercial power applications is still limited to very few cases. In fact, to apply HTS conductors they have to satisfy all the following basic requirements: large critical current density J_c at operating temperature and magnetic field, low AC-losses at 50-60 Hz, availability of km-long uniform conductors, good mechanical properties to withstand the stress and strain applied during handling and assembly procedures and, very important as well, low cost.
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