Virtual laboratories allow to provide presentation of the researched phenomena, as well as availability of methodical materials which will be accessible in a global network, in the created laboratory of electronic elements. The virtual laboratory allows to expand opportunities of laboratory base of university, but does not allow to develop skill of circuit connection, and only gives an opportunity to experiment with available circuits. Virtual laboratories will increase quality of educational process in technical university. The purpose of work: get acquainted with three-phase circuits, at connection of loads by a star and a triangle, in various operating modes. Tasks: to receive circuit describing value, in the MatLab environment, to compare with the results received theoretically.