Engineering Physics Annotation << Back Evaluation of the Effect of Electrotelluric Fieldson the Model of the Grounding System of Unipolar DCTransmission using Dynamic Measurementsof the Potential Difference Between the Electrodes Dudchenko I.P., Gulyakov S.A., Stovbun N.S., Shakhov I.M. This paper explores the impact of electrotelluric fi elds on the operation of grounding systems in unipolar direct current (DC) transmission systems, with a focus on research conducted at the Institute of Marine Geology and Geophysics of the Far Eastern Branch of the Russian Academy of Sciences. The study highlights the potential application of DC transmission in the Sakhalin region, the only island region in Russia where this technology is not yet utilized, despite its potential to enhance the reliability of the power system. To assess the infl uence of electrotelluric fi elds, a system was used to measure potential differences between electrodes. Measurements were conducted using an electrode system and an analog-to-digital converter capable of registering potentials generated by electrotelluric fi elds. The study found that horizontal electrotelluric fi elds can induce voltages of approximately 6 V per kilometer along the line. This discovery opens the possibility of using these changes as indicators of seismic activity and other geophysical processes. The paper emphasizes the importance of considering the effects of electrotelluric fi elds in the design and operation of unipolar cable DC transmission systems, particularly in the context of the Sakhalin region, where adopting DC transmission could signifi cantly improve the resilience and reliability of the power grid Keywords: direct current transmission, electrotelluric fi eld, geophysics, dynamic measurements. DOI: 10.25791/infizik.11.2024.1435 Pp. 03-11.