Tóm tắt
This study investigates the transient response of grounding systems in Vietnam’s transmission networks, where lightning-induced faults constitute a major source of system disturbances. Existing grounding designs are predominantly based on DC resistance criteria and fail to adequately capture the high-frequency behavior of lightning currents. Representative grounding configurations employed in Vietnam, including radial, rod-radial, rod, and ring systems, are analyzed using the Finite Element Method (FEM). This approach enables a rigorous evaluation of key parameters, including transient impedance, ground potential rise (GPR), step voltage, touch voltage, and surge impedance. The study further examines the effects of frequency, grounding configuration, geometric characteristics, and soil properties on overall performance. The findings provide a comprehensive characterization of transient grounding behavior and offer a foundation for optimizing grounding design to enhance lightning protection and system reliability.