Simplified calculation for grounding resistance of transmission tower

In the grounding design of high voltage transmission line the empirical formula is often used to calculate the grounding resistance of transmission tower, so the calculation accuracy is just passable. Considering the non-uniformity of the current dispersed from the grounding electrode, a grounding electrode is divided into sections to calculate their self-resistance coefficients and mutual resistance coefficients, thus the grounding resistance of grounding electrode is solved. The number of conductor sections is dependent upon the requirement to computation accuracy, the more the number of the sections, the higher the computational accuracy. Finally, the grounding resistances of grounding electrode usually used for transmission tower, such as radial grounding electrode and double-ring grounding electrode, under different soil resistivity, conductor radii and depths of burying are analyzed.