直埋金属管道对其内铠装通信电缆的电磁屏蔽计算

建立了一种考虑感性耦合与阻性耦合影响时 ,铠装电缆套加装金属管道后电磁屏蔽计算的通用模型。该模型是在场路结合的基础上 ,对导体采用线性化单元离散 ,建立相应的方程组 ,求得导体中的电流分布 ,从而可对地下通信电缆系统进行电磁屏蔽的近似计算。最后给出了计算实例

ELECTROMAGNETIC SHIELDING CALCULATION OF THE TELECOMMUNICATION CABLE SURROUNDED BY BURIED PIPELINES

A universal model of telecommunication cable surrounded by the buried metal pipeline for calculating their current distribution and shielding effects is presented, which takes the inductive coupling and resistive coupling with each other in the presence of a uniform half space conductive medium(earth) into account. The model is based on the combination of the circuit theory and the electromagnetic field theory. By means of dividing the conductor element using a linear interpolation method, a discrete equation group is constructed to solve the current distribution and then calculate the shielding effect of the underground telecommunication cable system. In fact, the model developed can be generalized easily to solve the current distribution of the multi conductor system. The validation of the model is verified by a practical problem case.