Russian Federation
UDC 621.316.9
UDC 621.315.1
Objective: to analyze modern lightning protection methods for buildings and 6–10 kV overhead lines supplying railway automation and remote control (zat) systems, and to assess their applicability considering typical lightning impact scenarios. To substantiate the necessity of an integrated approach to protecting power supply inputs. Methods: an analytical review of scientific publications, regulatory documents, and operational data was conducted. External and internal lightning protection systems, as well as methods for improving the lightning performance of overhead lines, were classified. The operating principles of protective devices were compared with the main lightning impact scenarios, including direct strikes to phase conductors, strikes to poles or grounding systems, and nearby strikes causing electromagnetic induction. Results: it is shown that the effectiveness of conventional protection methods strongly depends on operating conditions and cannot be ensured by isolated application of individual measures. Limitations of shield wires and the installation of surge arresters only at power supply inputs are identified. The necessity of accounting for traveling wave processes in overhead lines when selecting protective device configurations and implementing “protected approaches” to railway automation facilities is substantiated. Practical significance: the proposed approach reduces impulse overvoltages at power supply inputs and improves the reliability of railway automation and remote control systems.
lightning, external lightning protection, internal lightning protection, protective devices, lightning protection of high-voltage lines, railway automation and remote control
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