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).

中文翻译：

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交流/直流混合电气化铁路线路：接地研究


在本文中，我们分析了交流/直流电气化相结合的混合电气化区域。接地策略完全不同，因为直流电气化的目标是使铁轨与地面隔离，而交流电气化通常将铁轨和其他金属部件（例如结构和架空接触网系统（OCS）杆）连接到地面。在某些位置，实际上不可能有效地将两种接地方案分开。这使得直接连接到地面的元件（即结构基础、接地棒甚至铁轨）受到腐蚀。这种混合环境给安全和腐蚀管理带来了挑战。尽管限制直接接地元件的数量并通过空中接地线将它们全部连接起来是一种很好的防腐做法，但必须验证接触电压是否安全且符合标准（即 EN 50122）。