Against the larger equivalent radius of split-phase conductor.Using boundary element method simulation of the power frequency electric field strength around surface and 1m distance to the ground under the UHV transmission lines.In the establishment of UHV transmission lines split the wires on the basis of the model

Based on the Boundary Element Method to The equivalent radius of split-phase conductor of UHV transmission line is quite large.A model of split-phase conductor of UHV transmission lines is established.With this model and the finite element method

the power frequency electric field intensities both on surface of the split-phase conductor and on the position one meter above the ground directly under the UHV transmission lines are calculated respectively for four types of UHV transmission lines

which are parallel single circuit

double circuits on same tower

single circuit on cup-shape tower and compact transmission line.The results indicate that different conductor distributing modes should be adopted to adapt different geographical conditions in China.The compact transmission line can improve electromagnetic environment under the lines

and substantially reduce the transmission corridor width.