摘要
为研究埋地电缆对高空核爆电磁脉冲(HEMP)的响应规律,利用快速傅里叶变换和逆变换技术计算了地下电磁脉冲环境。将入射波的极化角、方位角和仰角作为一组随机变量,计算了入射波状态对响应电压、电流影响的统计规律,研究了大地参数和电缆状态对感应信号的影响规律。结果表明:入射角度在[0,π/2]范围内变化时,在相同的累积概率下,电缆末端响应幅值总大于首端响应幅值;电缆芯线电导率和绝缘层介电常数对感应电流基本无影响;电缆电压及电流响应幅值随大地介电常数和电导率的增大而减小;与HEMP早期分量的感应电流相比,中期分量的感应电流幅值仅为前者的0.1~0.2倍,但脉宽可达几百μs,大地电导率对中期分量的感应信号影响小。
To study the response rules of buried cables to high-altitude electromagnetic pulse（HEMP）, the environment of HEMP underground was got by the fast Fourier transform technique and inverse transform technique. Taking polarization angle, incident angle and azimuth angle as a set of random variables, we calculated the statistical effect of angles on induced currents in the cable terminals. The results show that when the range of angles is of [0, π/2], the responses of head terminal is smaller than that of end terminal in the same cumulative probability. The larger the earth conductivity or earth permittivity is, the smaller the current is. The conductivity of cable conductor and the permittivity of cable insulation hardly affect the current. The pulse width increases with the increase of cable length, but the current magnitudes have little change. Compared with the response current to early component, the current to the middle component is quite small and the pulse width can be up to several hundred microseconds. The earth conductivity has less effect on the current to the middle component.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第9期3014-3020,共7页
High Voltage Engineering
基金
强脉冲环境模拟与效应国家重点实验室专项经费资助项目(SKLIPR1412)~~
关键词
高空电磁脉冲
埋地电缆
耦合
BLT方程
累积概率密度
high-altitude electromagnetic pulse
buried cable
coupling
BLT equations
cumulative density
