Ground level electric and magnetic-fields from overhead power transmission lines are of increasingly important considerations in several research areas due to their impact on health and environmental issues. The paper presents a more generalized technique to calculate the magnetic-field generated by power transmission lines in three dimension coordinates. This technique has been evolved, formulated, analyzed and applied to a suggested 500-kV single circuit transmission line to evaluate the effects of line topology and terrain topography on the computed magnetic-field. The results are compared with two-dimensions technique.
