Abstract
In this article, we analyze mixed electrified areas where there is a combination of ac/dc electrification. The grounding strategy is completely different, as dc electrification aims to have the rail isolated from the ground, and ac usually has the rail and other metallic parts, such as structures and overhead catenary system (OCS) poles, connected to the ground. At certain locations, it is practically impossible to effectively separate both grounding schemes. This enables the corrosion of the elements directly connected to the ground, namely, structure foundations, grounding rods, or even the rails. This mixed environment presents challenges for both safety and corrosion management. Although it would be a good anticorrosion practice to limit the number of directly grounded elements and connect them all by an aerial ground wire, it must be verified that the touch voltages are safe and compliant with the standards (namely, EN 50122).
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