Purpose. Perform an analysis of the conditions of the direct-current transmission in a monopolar mode in the conditions near the alternating voltage substation located and to conduct a study of the occurrence of a direct current of dc bias in the windings of power transformers of an alternating current that fall into the zone of the induced potential. Methodology. The basis of the work is based on theoretical studies of the problems related to the operation of power equipment of alternating voltage in the zone of action of the given potential in foreign countries. The results of the research were processed using modern software applications: MathCAD. Findings. In the course of the work, overtime values of the direct current of magnetization of windings of autotransformers for the Vinnytsia 750 kV substations were obtained, with the location of a transformation substation in the Western Ukrainian Power System of Ukraine, at a 750 kV Western-Ukrainian substation. When operating semiconductor converters in unipolar mode, the direct magnetizing current exceeds the permissible norms by 13% for 330 kV substations and more than 7 times for 750 kV substations. Originality. The authors carried out a theoretical study, one of the possible options for establishing the transmission of DC in Ukraine, and identified the risks associated with the monopolar mode of operation of the transducer of constant voltage. Practical value. The results of the work can be used in the design of new DC transmissions (DC inserts) in the power grid of Ukraine in order to increase its export capabilities and also at research of possible operating modes of transfers of a direct current as a part of systems of alternating voltage.