Abstract
To overcome the problem of tuning area faults influencing the normal operation of the ZPW-2000A track circuit, protector models are established to protect the track circuit from interference. First, the parameters of the protector models are calculated according to the circuit resonance principle. Second, a four-terminal network model of the track circuit in a normal state is established according to transmission-line theory and the transmission equations are derived. Third, the rail voltage is simulated, and an experimental platform is built to verify the models. Finally, the transmission equations of the protectors are derived, and the variation of the rail voltage is analyzed. The results indicate that tuning area faults have significant influence on the rail voltage. However, the installation of protectors can effectively reduce the influence, and not bear on the normal operation and maintenance of the track circuit, which significantly improves the protection ability of the track circuit against tuning area faults.
Highlights
Introduction1The ZPW-2000A track circuit system is widely used in China. tuning area faults can lead to the transmission of over-zone signals in different sections and frequently cause potential trouble
To overcome the problem of tuning area faults influencing the normal operation of the ZPW-2000A track circuit, protector models are established to protect the track circuit from interference
The effect of tuning area faults was studied according to the circuit resonance principle and transmission-line theory
Summary
The ZPW-2000A track circuit system is widely used in China. tuning area faults can lead to the transmission of over-zone signals in different sections and frequently cause potential trouble. Wu et al.[11,12] studied the damaged insulation of the track circuit in the ZPW-2000A station and designed a choke adaptation transformer to protect the receivers, obtaining good results through test and verification They designed a protection scheme to protect the over-zone signal in the station by installing a resonance circuit in the choke transformer, which was applied to the rail in the tuning area. There are many resonance circuits applied to electrical systems, which can ensure safety and improve transmission ability [14,15,16] Most of these researchers considered maintainability [17], but research efforts were less focused on fault protection abilities. The protection ability of the track circuit against tuning area faults is verified by simulation
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