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A three-dimensional lattice of the Josephson junctions with a finiteself-conductance is employed to model the ceramic superconductors. Thenonlinear ac susceptibility and the compensation effect are studied by MonteCarlo simulations in this model. The compensation effect is shown to be due tothe existence of the chiral glass phase. We demonstrate, in agreement withexperiments, that this effect may be present in the ceramic superconductorswhich show the paramagnetic Meissner effect.Comment: 6 pages, latex, 4 figures, Phys. Rev. B (accepted

Second harmonics and compensation effect in ceramic superconductors