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提出了一种同时考虑感性耦合和阻性耦合时的地下管线对通信电缆的电磁屏蔽模型,以管线节点电流代替管线单元电流进行插值,改进了传统电磁屏蔽效应计算方法。在此基础上,进行了地下管线对地下通信电缆的电磁屏蔽系数计算,探讨了屏蔽保护的规律。计算结果表明,管线粗细和端接阻抗将明显影响屏蔽保护效果。
An electromagnetic shielding model of underground pipeline to communication cable considering both inductive coupling and resistive coupling was proposed. The pipeline node current was interpolated instead of the pipeline unit current to improve the traditional electromagnetic shielding effect calculation method. On this basis, the calculation of the electromagnetic shielding coefficient of the underground pipeline to the underground communication cable is carried out, and the law of shielding protection is discussed. The calculation results show that the thickness of the pipeline and the termination impedance will obviously affect the shielding effectiveness.