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直埋金属管道对其内铠装通信电缆的电磁屏蔽计算-[资讯]

来源:鹤岗建材网 时间:2022年09月23日

直埋金属管道对其内铠装通信电缆的电磁屏蔽计算

中图分类号:TM253 文献标识码:A

文章编号: ELECTROMAGNETIC SHIELDING CALCULATION OF THE TELECOMMUNICATION CABLE SURROUNDED BY BURIED PIPELINESZOU Jun, YUAN Jian-sheng, LU Jia-yu, MA Xin-shan

ABSTRACT: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 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.

KEY WORDS:power line; telecommunication cable; electromagnetic shielding; dangerous influence; universal model2 引言电力线路对地下通信电缆线路的危险影响的分析计算是一项十分有意义的课题。当危险影响超过一定标准时,常见的方法是施工时在通信电缆附近安装屏蔽线或在通信电缆外套装金属管道等方法进行电磁屏蔽,以期系统达到规程要求。对于这种同时考虑直埋金属管线、电缆屏蔽层和铠装所构成的多层导体系统的电磁屏蔽计算的方法目前尚未见报道。

涂有外被层的地下金属管道对地泄漏电流很小,计算电流时一般忽略管道纵向不同部分之间的阻性耦合,此时可根据传输线理论求解[2~5]。对于直埋金属管道和直埋铠装电缆,阻性耦合影响较大,用传输线理论求解困难。加拿大学者Dawalibi博士在分析接地导体中电流分布时,考虑阻性耦合影响,将导体泄漏电流集中于若干点流入大地[6~9],这与直埋金属管道、铠装电缆分散接地的特点有较大差异。针对这一特点,

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