有限长度埋地多导体电缆对外界电磁场响应特性分析  

Response Analysis on Buried Multiconductor Cable with Finite Length to External Electromagnetic Field

作　　者：王川川[1] 朱长青[1] 周星[2] 谷志锋[1] 

机构地区：[1]军械工程学院电气工程系,石家庄050003 [2]军械工程学院静电与电磁防护研究所,石家庄050003

出　　处：《高电压技术》2012年第11期2836-2842,共7页High Voltage Engineering

基　　金：国家自然科学基金(50977091)~~

摘　　要：为研究埋地多导体电缆耦合外界电磁场的变化规律,利用快速Fourier变换和逆变换技术,结合多导体传输线的链参数方程导出了外场辐照下电缆两端感应信号的频域、时域计算公式,研究了电缆末端感应电流的变化规律。结果表明:感应电流随电缆埋地深度的增加而减小,分别随大地电导率和相对介电常数的增大而减小,随着导体电导率的增大而无明显变化,及随着线长的增加而增大;在[0,90°]范围内,感应电流分别随极化角、方位角的增加而减小,随俯仰角的增大而增大;以特性阻抗值为分界点,当电缆端接阻抗值在小于或大于特性阻抗值的范围内分别变化时,感应电流会呈现不同的变化规律。此研究方法和结论对于埋地电缆的电磁防护有一定参考价值。In order to research the variation rule of buried multiconductor cable coupling to external electromagnetic field,combining with chain parameter equations of multiconductor transmission line,we deduced calculation formulas of induced signals at cable terminals in frequency domain and time domain by the fast Fourier transform technique and inverse transform technique,and researched the variation rule of terminal currents.Results show that induced current decreases with the increase of buried depth of cable,but increases with the increase of earth conductance and relative permittivity,respectively.The induced current does not change evidently with the increase of conductance of cable conductor,but increases with the increase of cable length.In the range of[0,90°],the induced current decreases with the increase of polarization angle and orientation angle,respectively,but increases with the increase of pitching angle.The characteristic impedance of cable is a demarcation point,when terminal impedance is smaller or bigger,the induced current changes differently.The method and results can be used as references to electromagnetic protection of buried cable.

关 键 词：埋地多导体电缆 传输线理论 Agrawal模型 快速FOURIER变换 链参数方程 电磁防护 

分 类 号：TM75[电气工程—电力系统及自动化] TN03[电子电信—物理电子学]