Simulation researth on current diffusion feature of HVDC Vertical Grounding Electrode

As the land acquisition and site selection of DC grounding electrodes becomes more and more difficult, the use of vertical grounding electrodes is an effective solution. Based on the field-circuit coupling method, this paper calculates and analyzes the dispersion characteristics of HVDC grounding electrodes in different lengths, conductor spacing, earth models and arrangements. The results show that increasing the conductor length can effectively reduce the grounding resistance, maximum step voltage, maximum touch voltage and other parameters. When the conductor length is increased from 8m to 20m, the ground resistance dropped by about 49%, the maximum step voltage dropped by about 57%, and the maximum touch voltage dropped by about 59%. When the conductor spacing is small, increasing the conductor spacing can effectively reduce the above-mentioned characteristic parameters, and the effect decreases sharply as the spacing continues to increase. The research results of this article can provide references for the design of DC grounding electrodes.