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http://dx.doi.org/10.7782/JKSR.2017.20.2.190

Study on Detection of Broken Rail Using Impedance Measurement  

Kim, Jae Hee (Korea Railroad Research Institute)
Ahn, Chi-Hyung (Korea Railroad Research Institute)
Publication Information
Journal of the Korean Society for Railway / v.20, no.2, 2017 , pp. 190-195 More about this Journal
Abstract
This paper proposes a method to detect rail broken through impedance measurement. In general, broken rails are detected in real time using the track circuit, but the proposed method not only detects the broken rails but also estimates positions of broken areas by measuring the rail impedance. To electrically insulate one side of the rail, parallel resonance is made by adding a capacitor; then, the impedance of the other rail is measured. If the measured impedance has an inductive value, there is no broken area of rail. However if the measured impedance has a capacitive value, the rail is broken. The proposed method is modeled using a transmission line; it is shown that the modeling can estimate the position of the broken rail according to the impedance value. The rail impedance is measured by the proposed method for a 60m simple rail model, and it is verified that the presence of a broken rail changes the rail impedance.
Keywords
Rail broken; Impedance; Detection;
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