Abstract
This work presents the impacts related to the addition of deep vertical electrodes on grounding meshes to transmission line performance. For soils with electric resistivity value lower at below layers, to use deep vertical electrodes can be a very interesting procedure to improve the grounding resistance and impedance characteristics for fast transients. A proposed installation procedure is presented as well as a brief cost comparison to the commonly use of surge arresters. A critical path from a 230-kV transmission line is evaluated for the direct incidence at the top of structures and mid span of first and subsequent lightning strokes. The results suggest a remarkable improvement of TL performance due to the use of deep vertical electrodes, particularly for first strokes, and the possibility of being added with other techniques, as underbuilt wires.
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