Fault Diagnosis for ZPW2000A jointless track circuit compensation capacitor based on K-fault Diagnosis

This paper presents a method for diagnosing online track circuit compensation capacitor fault based on K-fault Diagnosis. This method can locate real time capacitor fault by taking use of the measurement data collected at indoor fixed measuring nodes. To achieve the diagnosis goal, this paper establishes lumped parameters equivalent circuit model of main track of track circuit. On the basis of this model, this paper establishes node-voltage analysis equation for ZPW-2000A jointless track circuit by using Kirchoff´s law. Applying K-fault diagnosis method to this model, it can diagnose track circuit capacitor fault. This paper also presents a method that improved the performance of the original K-fault diagnosis method. By improving the existing method, the range of possible fault capacitors is narrowed down to a great extent. This paper gives the definitions of linear correlation degree and full rank degree. According to the definitions, this paper realizes fault diagnosis of track circuit capacitor with noised measurement data. The simulation experiment shows that the algorithm can effectively locate the soft fault of single capacitor online.