电缆槽对电缆间串扰的影响研究

Research on the influence of cable trough on crosstalk between cables

电缆在使用时一般会铺设在电缆槽中,而电缆槽对铺设其中电缆之间的串扰会形成影响.针对电缆槽中电缆之间的串扰问题,提出一种结合多端口网络理论及分块级联思想的建模方法,使用基于波导格林函数的矩量法来提取电缆槽中电缆间的分布参数,并用虚拟节点理论将提取的分布参数矩阵转化为模型中的传输函数.通过与商业电磁仿真软件的仿真结果进行对比,验证了本文的模型及算法在分析电缆槽中电缆间的串扰问题时具有较好的精确度,最后运用此方法分析了电缆处于电缆槽中不同位置时的线间串扰大小,并结合铁路现场的实际情况对电缆槽中电缆的布线方式提出了建议.

The cable is usually laid in the cable trough when used, and the cable trough will affect the crosstalk between the cables that are laid within. Aiming at the crosstalk between cables in the cable trough, this paper firstly proposes a modeling method combining multiport network theory and block cascade idea. Secondly, a method of moment based on waveguide Green’s function is introduced, which is used to extract the distribution parameters between cables in cable trough. Next, the virtual node theory is applied to transform the extracted distribution parameter matrix into the transfer function in the model. Then, by comparing the simulation results based on our modeling method with those based on the commercial electromagnetic simulation software, the proposed model and algorithm are proved to have high accuracy in analyzing the crosstalk between cables in the cable trough. Finally, this method is used to analyze the crosstalk between cables in different positions in the cable trough, and some suggestions are put forward for the wiring method of the cables in the cable trough according to the actual situation of the railway field.