The physics of all processes taking place in ordinary superconductors (the Meissner image currents, vortices interacting with one another, etc.) is clear and the theory based on the Landau-Ginsburg equations had been constructed before the Bardeen-Cooper-Schrieffer (BCS) theory was developed. In ceramic HTSCs, the theoretical description of these processes faces some problems, which are connected with the cellular structure of the medium, when dielectric regions are located between the contacting superconducting granules. In the regions where the granules contact one another, the large...