In order to solve the problem that the mechanical insulated joint of the high speed railway station is damaged, the carrier frequency information of the adjacent track circuit is interfered with each other, which affects the safety of the track circuit, a protective choke matching transformer is proposed. Firstly analyzing the different damage situations of the mechanical insulated joint of the high-speed railway station, and introducing the structure of the current transformer. Then the structure principle and parameter calculation method of protective choke matching transformer are introduced. Finally, the theoretical analysis and experimental results show that the protective choke matching transformer can eliminate the interference of the carrier frequency of the adjacent track circuit and meet the anti-interference requirement.
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