At the present time, due to the intensification of production, the increased use of electricity in various areas and the use of various electrical appliances, further development of the electric power industry is necessary.There is a constant growth of generators' unit capacity and the total growth of power plants' capacity, the voltage and length of power transmission lines are increasing, and electrical equipment is becoming more complex. All this puts forward new parameters and requirements for efficiency and reliability of the system elements. These tasks are solved at the stage of designing electric power facilities. Thus, it is necessary for a future specialist to get skills in designing such objects. One of the important elements of such design is the calculation of short-circuit currents in different modes.