Abstract

Incorrect adjustment of railway traffic control devices (rtc) to the specificity of the area in terms of lightning density may result in their damage by lightning-caused electromagnetic pulses. An associated risk assessment, as the standard in the analyses of the strength of rtc devices, should be made. However, manufacturers of rtc devices typically do not perform tests with respect to such high overvoltage conditions. Particularly in the case of the EN 62305-2 standard, the manufacturers of new rail traffic control devices usually do not carry out such analyses. In this paper, an analysis of the damage vulnerability of rtc devices caused by lightning discharges for a selected structure, including a signal box equipped with digital rtc devices is presented. The necessity of conducting a lightning damage vulnerability analysis for rtc devices is demonstrated. A part of the railway track where lightning discharges occur was analyzed. The results of the risk analysis obtained with the use of the DEHN Risk Tool software and based on the standard EN 62305-2 (2008, Lightning protection. Part 2. Risk management) are presented. Due to the fact that railway devices are not included in the current standard, three documents were adopted for the analysis: two editions of EN/IEC 62305-2 (from 2008 and 2012) and the recommendations of the ITU-International Telecommunication Union ITU-T K.39 (10/1996). The presented analysis is performed according to the 2008 standard version and to the chosen device.

Highlights

  • Taking into account the fact that damage caused by lightning discharges is dangerous for rtc devices and results in significant losses, an attempt was made to assess the risk of damage to these devices and the applied protection measures in the presented publication

  • The continuous operations of computer RTC devices require the reliable transmission of transmitted data and signals

  • Unauthorized access, malware, overvoltages caused by lightning strikes, or switching overvoltages may pose threats to the network

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Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Risk assessment procedure only for the analyzed facility (without the part concerning the service device connected to it); Damage associated with the presence of living creatures inside the facility taken into account during risk estimation; Lowering the value of tolerated risk (RT ) of cultural heritage loss from 10−3 to 10−4 , An additional provision allowing for the extension of damage to the environment and surrounding objects; Correction of the formulas determining: equivalent collection areas for lightning strikes near the object, in the line reaching the object and in the vicinity of such a line, the probabilities of damage, loss coefficients in buildings where an explosion may occur, risk in zones in the facility and costs of losses; New tables allowing the selection of the relative cost of losses for the analyzed cases,. Taking into account the fact that damage caused by lightning discharges is dangerous for rtc devices and results in significant losses, an attempt was made to assess the risk of damage to these devices and the applied protection measures in the presented publication.

The Method of Analysis According to EN 62305
Description of the Structure and Its Environmental Parameters
The Lightning Protection Zones of the Analyzed Structure
Lines Entering and Cables within the Structure
Fire Hazard
External Spatial Shielding
The Risk Analysis and Choice of Protection Measures
Conclusions

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