Lightning stroke risk assessment method for high-speed railway track circuit system.

Abstract

The invention discloses a lightning stroke risk assessment method for a high-speed railway track circuit system. According to the method, a signal cable, a steel rail and other multi-conductor transmission line model and a lumped parameter equivalent circuit model of key equipment of a track circuit system are established based on a multi-conductor transmission line theory and frequency domain transmission characteristics, establishment of a track system lightning stroke transient calculation model is completed, and then lightning overvoltage of the track circuit system in each section is calculated; the minimum lightning current amplitude causing the damage of the section of the track circuit system is obtained; finally, the lightning stroke insulation damage frequency of the track circuit system per kilometer is calculated to obtain the lightning stroke damage rate of the track circuit system. According to the method, the obtained data is closer to the actual situation, the lightningstroke characteristics of the track circuit system can be quantitatively analyzed, a high-speed rail operation management department can be effectively helped to carry out lightning stroke risk assessment, and lightning protection design work is carried out based on the principle of fault guiding safety of a rail circuit system.

Description

technical field [0001] The invention belongs to the field of lightning protection for high-speed railway track circuit systems, and in particular relates to an assessment method for lightning strike risk of high-speed railway track circuit systems. Background technique [0002] my country's high-speed railways are usually laid via viaducts. Taking the Beijing-Tianjin intercity and Beijing-Shanghai expressways as examples, the length of viaducts accounts for more than 80% of the total mileage. The number of lightning strikes increased significantly. The track idle detection and control signal transmission in the train operation control mainly rely on the track circuit system, which is a non-insulated frequency-shift automatic blocking system composed of railway rails as transmission conductors. [0003] The track circuit system is a weak current system laid along the track, and is electrically connected to the catenary pillar. The transient overvoltage generated when the cate...

AI Technical Summary

Problems solved by technology

[0003] The track circuit system is a weak current system laid along the track, and is electrically connected to the catenary pillar. The transient overvoltage generated when the catenary is struck by lightning can easily invade the track circuit system, causing damage to its equipment, and the number of lightning strikes on the catenary increases significantly. Directly lead to a significant increase in the risk of lightning strike failure of the track circuit system

Operating experience shows that lightning strikes cause damage to the track circuit system from time to time, and even caused safety accidents

Moreover, the lightning risk assessment and analysis of the weak current system in the communication industry lacks quantitative methods. If the series of lightning protection standards are directly used, the entire high-speed rail signal system will be in a state of over-protection or under-protection, which will cause economic losses. It is difficult to adapt to the design principle of "failure-oriented safety" of track circuit system with protection strategies and measures

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