Statistical analysis on EMI to vehicular signaling system in CRH

Vehicular signaling system of CRH acquires real-time information of train, track and route, and also directly controls EMU train according to the instructions from vehicular signaling information. Therefore it is the key to safety of CRH. Due to the wide application of electronic devices in high power and the improvement of the automatic controlling system in CRH trains, the probability of vehicular signaling system being affected by EMI is greatly increased. At present the EMC anti-interference is standardized by EMC specification. However there are still problems due to varying EM environment on the trains. This paper analyzes the EM environment according to the actual work of CRH vehicular signaling system. The coupling path of EMI into the signaling system is modeled and analyzed. The conclusion shows that the EMI disturbance generated by the catenary is majority. And it causes vehicular signaling system of track circuit and balise failure, resulting in CRH driving fault. Based on the analysis, this paper also puts forward the optimization for such EMC problems.