Computation of 3-D Electric Field on Buildings of Arbitrary Shape Near HVDC Transmission Lines.

Electrical environment of residences adjacent to Ultra high voltage direct current (UHVDC) transmission lines draws huge attentions as it affects people’s lives. Predicting electric field is a crucial part during the design and environmental impact assessments of HVDC transmission lines. However, traditional methods have difficulty coping with the complex geometry of residences and bundled line conductors simultaneously. To deal with this issue, a line-area element hybrid boundary element method is proposed, combined with flux tracing method, to compute 3D total electric field on buildings of arbitrary shape near HVDC transmission lines. Line and area elements are used to discretize bundled line conductors and buildings, respectively. Its correctness is validated by the experimental data reported in the literature, with a maximum relative error of about 10 % on the top of residences. Its applicability is demonstrated by several case studies encountered in practical UHVDC transmission projects. The results also show that parapet walls can weaken the electric field on platforms of residences. In the case presented in this paper, the TEF is reduced by about 58 %. This work can provide theoretical and technical support for the design and environmental impact assessments of HVDC transmission lines.