Assessment method for lightning strike risk of high-speed railway track circuit system

Abstract

The invention discloses a lightning strike risk assessment method for a high-speed railway track circuit system. The method establishes multi-conductor transmission line models such as signal cables and rails based on multi-conductor transmission line theory and frequency domain transfer characteristics, and a centralized parameter equivalent circuit model of key equipment in the track circuit system, completes the establishment of a lightning strike transient calculation model for the track system, and then calculates The lightning overvoltage of the track circuit system in each section obtains the minimum lightning current amplitude that causes damage to the section of the track circuit system, and finally calculates the number of lightning insulation damages of the track circuit system per kilometer to obtain the lightning damage rate of the track circuit system. This method Making the obtained data closer to the actual situation and being able to quantitatively analyze the lightning strike characteristics of the track circuit system will effectively help the high-speed rail operation management department to conduct lightning strike risk assessment, and carry out lightning protection design work based on the principle of "fault-oriented safety" for the track circuit system.

Description

technical field [0001] The invention belongs to the field of lightning protection of a high-speed railway track circuit system, and particularly relates to a method for evaluating lightning strike risk of a high-speed railway track circuit system. Background technique [0002] my country's high-speed railways are mostly laid by viaducts. Taking Beijing-Tianjin Intercity and Beijing-Shanghai Expressway as examples, the length of the viaducts accounts for more than 80% of the total mileage. The number of lightning strikes increased significantly. Track idle detection and control signal transmission in train operation control are mainly realized by the track circuit system, which is a non-insulated frequency-shifting 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 pillars. The transient overvoltage generated when the caten...

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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