BEM ANALYSIS OF ELECTRIC-FIELD EXCITED BY OVERHEAD HV LINES ERECTED IN BUILT-UP AREAS

The boundary element method is adapted to 2-D electric field analysis in the vicinity of HV transmission lines of alternating current. The i nfluence of buildings placed near the line and the irregular shape of the ground are taken into account. A double-layer mathematical model o f the buildings is proposed. The material parameters are expressed by the effective complex permittivity. A direct BEM formulation with the elimination of interzonal normal derivatives is employed and the appro priate boundary integral equations are derived. The computational resu lts of the electric field distribution near the 400kV transmission lin e are presented.