Computational analysis of total electric field under ± 800 kV UHVDC transmission lines with cuboid buildings nearby

The total electric field on buildings has emerged as a significant factor in the design of high voltage direct current (HVDC) transmission lines. To date, there has been a few reports detailing the effects of building parameters on the total electric field distribution both on the ground and on building platforms, and line parameters are rarely considered. This study computes and analyzes the two-dimensional distributions of the total electric field on buildings, systematically examining the influences of various parameters. The findings reveal that parameters including building length, pole separation, and conductor split spacing have negligible effects on the lateral distribution of the total electric field. In contrast, the width and height of the building, the height and split number of the conductor, and the distance between the conductors and the building significantly affect the lateral distribution. The maximum and minimum values of the total electric field on the platform show a negative linear dependency on the building width and split number; they are related to the building height through a parabolic function and follow a negative dependency on the distance between the pole conductor and the building. Furthermore, the shielding effect of buildings on the ground electric field is greatly impacted by the building height, with shielding coefficients decreasing non-linearly as the building height increases.