Research on Current Dispersion of Different Grounding Electrodes

The grounding electrode is essential for the UHVDC transmission project, and it is an important factor that determines the stable operation of the power system. In this paper, the current dispersion characteristics of three different shapes of linear, cross, and circular grounding electrodes are studied through the finite element method. Secondly, a grounding electrode simulation setup was established, a sensor-based measurement scheme was proposed, and the simulation results were verified by experiments. Finally, the conclusion shows that the circular grounding electrode has the best dispersion characteristics, and the maximum surface current is about 50% lower than that of the linear grounding electrode. Meanwhile, the error between the measured current value and the simulated value is between 3%-8%. The grounding electrode current measurement scheme proposed in this paper can provide a certain reference significance for grounding electrode construction projects, and plays a good monitoring role in the operation of the power system.