Frequency-shift keying audio jointless track circuit is used in high-speed railway in China. However, within the station, track circuit with mechanical insulation is applied. In complex circuit network of electrified railway station, impedance match bond is designed to ensure the normal operation of the track circuit and the protection of strong traction current interference. As a combination of strong and weak electricity components of track circuit, impedance match bond is both the part of the loop of the traction current and the part of the transmission line of track circuit, playing a very critical role in the electrified railway. The structure of impedance match bond is more complex than traditional impedance transformer, including the transformer with larger air-gap, LC resonance circuit for power frequency filtering, and components to enhance the signal frequency. Modeling on impedance match bond and study about the four-terminal network parameters of impedance match bond are in favor of the follow...
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