Analysis and simulation of the Crosstalk between High voltage cables and low voltage signal lines in EMU

Aiming at the coupling problem between CRH3G EMU 25kV High Voltage Cable and sensor cables under the train, this paper extends the basic theory of transmission line and establishes the crosstalk theoretical model for the two kinds of commonly used shielded cables. According the arrangement of sample train, the transmission line is divided into two sections for solving the problem of different length of parallel transmission lines. Firstly, the relationship between voltage and current at one point is built. Then two equivalent harassment sources of the 25kV High Voltage Cable core and screen are proposed at the beginning of parallel wiring part. After that time domain feature of crosstalk is analyzed by using the Finite difference time domain method, thereby the fulmar of transmission line piecewise matrix is proposed. In view of the actual situation, using 1kV Gaussian pulse modulation as excitation source of 25kV High Voltage Cable. The results show that, under these conditions the crosstalk can not affect the normal work of sensors.