外场辐照下埋地电缆瞬态响应规律研究  

Transient Induction Response Law of Buried Cable Excited by External Electromagnetic Field

作　　者：周星[1] 王川川[2] 朱长青[2] 谷志锋[2] 雷惠宁 

机构地区：[1]军械工程学院静电与电磁防护研究所,石家庄050003 [2]军械工程学院电气工程系,石家庄050003 [3]西安西古光通有限公司,西安710119

出　　处：《高压电器》2013年第12期7-12,共6页High Voltage Apparatus

基　　金：国家自然科学基金项目(50977091)~~

摘　　要：为研究埋地电缆耦合外界电磁场的变化规律,基于传输线理论,利用快速傅里叶变换和逆变换技术导出了外场辐照下电缆两端感应电压、电流的表达式,研究了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无明显变化;当线缆长度小于30 m时,随着线长的增加,感应电流峰值变大,当线缆长度大于30 m时,随着线长的增加,感应电流峰值减小。感应电流波形随线长的增加出现延时;在[0,90°]范围内,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;当电缆端接阻抗Z1为固定值,另一端接阻抗Z2增大时,Z2端电流呈减小趋势;当电缆端接阻抗Z2为固定值,另一端接阻抗Z1增大时,Z2端电流基本没有变化。In order to understand induction response law of a finite-length of buried cable to the external electromagnetic field, based on the transmission line theory, formulas of induced voltage and current at cable ends are deduced by fast Fourier transform and inverse transform technique, and the change law of induced current is analyzed. The results show that： （1） the induced current decreases with the increase in cable＇s underground depth, earth conductance or relative permittivity; （2）the induced current keeps stable when the conductance of the cable conductor increases; （3） when the cable length is less than 30 m, the peak value of the induced current increases with the increase in cable length, while the peak value decreases with the increase in cable length if the length is over 30 m; （4） time delay in the induced current waveform is observed with the increase in cable length; （5）in the range of [0,90°], the induced current decreases with the increase in polarization angle or orientation angle, but increases with the increase in pitching angle;（6）if one terminal impedance Z1 keeps constant and the other terminal impedance Z2 increases, the induced current in the Z2 end tends to decrease, while if Z2 is constant and Z1 increases, the induced current in the Z2 end keeps stable.

关 键 词：埋地电缆 传输线理论 BLT方程 快速傅里叶变换 

分 类 号：TM757[电气工程—电力系统及自动化]