[en] Numeric algorithms for solving electrostatics problems are described. Fields in double forming lines of Angara-5 device modulus and in high-current accelerator acclerating tubes are calculated. Finite difference method realized in the ERA applied program package serves as the basis. Here the PG-2M inlet complex, comprising a specially developed PG-2M language, PG-2M translator and an internal language is used for the first time which allows one to easily and rapidly prepose information about calculated area geometry, boundary conditions and electrostatic field characteristics derived. 15 refs.; 10 figs