Research on resistance reduction measures for power stations in high soil resistivity areas under environmental red line policies

Against the backdrop of dual carbon goals, power station construction in areas with high soil resistivity faces constraints from environmental red line policies, limiting the application of traditional resistance reduction measures (such as externally introduced grounding electrodes and soil replacement methods).This study investigates effective resistance reduction solutions within the power station′s red line boundaries to ensure safe and stable operation.Taking a 500 kV power station with high soil resistivity as the research subject, a grounding system model was established using CDEGS simulation software.Through simulation and comparative analysis, the effects of various resistance reduction schemes, including adding vertical grounding electrodes, constructing a three-dimensional grounding grid, utilizing natural grounding bodies, and integrating multiple measures on grounding resistance, contact voltage, and step voltage were evaluated.The study found that vertical grounding electrodes alone yield limited resistance reduction.Three-dimensional grounding grids significantly reduce contact and step voltages but have minimal impact on total grounding resistance.Utilizing natural grounding bodies effectively lowers grounding resistance but shows moderate effectiveness in improving contact and step voltages.The most effective integrated solution combines three-dimensional grounding grids with natural grounding bodies, enabling the power station to meet safety design specifications for grounding resistance, contact voltage, and step voltage.These findings can provide effective solutions and practical references for designing power plant grounding systems in high-soil-resistivity areas under environmental protection red-line policies.