Some aspects of modern theory of applied superconductivity

Insight into applied superconductivity (SC) based on C.P. Bean´s model (1964) of critical state concerning processes which take place in the SC wires is used to develop a series of recommendations for superconductor advances. There are many principal facts from experiments and practice which can not be explained within the framework of this understand, especially for nonstabilized conductors with high currents. This contradiction originates from the fact that a transition characteristic of a superconductor is smoothed in a region of electrical fields where modern superconductors work. This fact required revision of many aspects of the theory and practice of applied superconductivity. A review of the main results which have been obtained is presented. The possibility of stable performance of SC composites with high currents and poor cooling with various types of disturbances is given