Equivalent scheme for the V-I characteristics of Bi-2223/Ag tapes at 77 K

A series-parallel equivalent scheme is proposed to obtain better understand ing of the course of experimentally observed V-I characteristics of multifi lament Bi-2223/Ag tapes at liquid nitrogen temperatures. The elements of th e equivalent scheme reflect the intrinsic properties of the intergranular, respectively of the intragranular parts of the composite superconductor. Th e dependence on the transversal magnetic field as well on the relative orie ntation of the magnetic field with respect to the tape's broad face of two samples is presented and compared. The proposed method could offer better i nsight into the inner structure of the studied samples.