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The paper deals with the protection of the buried structures under the influence of DC traction network stray currents. The paper presents an algorithm for joint operation of drainage units for simultaneous protection of the grounding grid and two isolated underground conductors with priority protection of the grounding grid. The proposed algorithm of joint drainage protection of buried structures allows providing the possibility of optimal protection: simultaneous keeping of the protective potential of buried structures with the minimum required drainage current, which allows reducing energy costs, reducing corrosion damage and extend the operating life of buried structures.

The paper deals with the influence of stray currents on underground metal structures located near the traction rail network. The paper presents a system consisting of a traction rail network, a grounding grid and two isolated underground conductors located under the stray currents influence caused by electrified railway transport. Analytical expressions for the calculation of the distribution of electrical quantities in underground structures with their mutual influence were obtained. The expressions were obtained using Hartley integral transform, which in contrast to the Fourier transform allows carrying out integral transformations only with real-valued functions. The obtained expressions allow determining the zone of dangerous influence of stray current and can be used in the design of underground structure protection.