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本文介绍了缆皮理想屏蔽系数的确定方法,同时给出了由钢带內的磁通引起附加阻抗的计算公式。当终端接地电阻不等于零时,本文也给出了计算缆皮实际屏蔽系数的方法。文中讨论了缆皮与大地间的接触电阻。最后又给出国外电磁屏蔽电缆的某些结构数据。
In this paper, the method to determine the ideal shielding coefficient of the cable sheath is introduced, and the formula for calculating the additional impedance caused by the flux in the steel strip is given. When the grounding resistance of the terminal is not equal to zero, this paper also gives a method of calculating the actual shielding coefficient of the cable sheath. The paper discusses the contact resistance between the cable sheath and the ground. Finally, some structural data of the electromagnetic shielding cable are given abroad.