Abstract
The FTG-S 917 track circuit device installs an S-bond composed of cables instead of an impedance bond, which is a heavy object, at the boundary point of the existing track circuit, thereby simplifying the facility, improving the comfort of the train, and improving maintenance efficiency and stability. can improve However, as a disadvantage, precise frequency tuning is required during installation, and it is not easy to identify the location and cause of failure when a failure occurs.[1] Because of these problems, it is very important to theoretically analyze and confirm the frequency resonance characteristics of the S-bond boundary section and mutual induction and cancellation with the rail when current flows. In this paper, the electrical characteristic components of the electrical insulation part between the S-bond and the rail of Seoul Subway Line 2 were defined, and the flow of current was modeled through mathematical analysis. The modeled circuit was simulated with Matlab and the results obtained were verified by comparing them with field measurement results.
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