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交流电气化铁道对通信线的杂音干扰影响的理论计算,是目前广大设计者所共同关心的问题。利用现行的计算公式计算通信线上的杂音干扰电压,计算值往往大于实测值,其主要原因是没有考虑接触网上谐波电流的传输特性(即谐波的衰耗、相移和反射)及没有考虑接触网与通信线之间的互感系数是频率的函数。本文首先论述了接触网上的谐波传输特性,在此基础上,提出了考虑接触网上各次谐波的传输特性及互感是频率的函数时,通信线上杂音干扰电压的计算公式。
AC electrified railway noise interference on the communication line of theoretical calculations, is currently the majority of designers are concerned about the issue. Calculating the noise interference voltage on the communication line by using the current calculation formula is often larger than the measured value. The main reason is that the transmission characteristics of the harmonic current on the contact line (ie attenuation, phase shift and reflection of harmonics) The mutual inductance between the catenary and the communication line is a function of frequency. In this paper, the harmonic transmission characteristics of the contact line are firstly discussed. Based on this, the calculation formula of the noise interference voltage on the communication line is proposed considering the transmission characteristics of each harmonic in the contact line and the mutual inductance as a function of frequency.