Application of Impulse Response Characteristics in Rail-ground Transition Resistance Measurement
Journal Title: Urban Mass Transit - Year 2024, Vol 27, Issue 9
Abstract
Objective The stray current harm in urban rail transit lines is increasingly non-ignorable. Stray current is not easy to be detected, and the amount of the rail-ground transition resistance is a crucial factor affecting stray current. Therefore, measuring the amount of the rail-ground transition resistance is an effective stray current control method to judge the influence degree of stray current. Method Based on EMTP (electromagnetic transient program) software, a simulation model of the track circuit distributed parameters is built. The respective influence patterns of the distributed capacitance, distributed inductance, longitudinal resistance of the steel rail, and the rail-ground transition resistance on the time-varying characteristic curve of impulse impedance are obtained by using the single control variable method. The method of using impulse impedance time-varying ratio curve to judge whether the rail-ground transition resistance meets the requirement is proposed, and further verified by actual measurement of an urban rail transit line in Chengdu. Result & Conclusion Within 7~20 μs, only the rail-ground transition resistance parameter may affect the time-varying characteristics of the impulse impedance. Therefore, it can be used to reflect the condition of the rail-ground transition resistance and make valid judgement on whether the rail-ground transition resistance meets the requirement in the specification or not. Test results show that the measuring method is feasible and practical.
Authors and Affiliations
Xiaobin CAO, Jun YE, Manxiang WANG, Yaozheng JI, Minghua JIAN, Jinyang XIE
Keywords
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- EP ID EP744338
- DOI 10.16037/j.1007-869x.2024.09.030
- Views 49
- Downloads 0
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