摘要
通过开展自动气象站雷电防护试验,测量并量化分析了自然闪电条件下电源电缆的感应电压,探讨和分析了闪电事件中不同埋设条件下电源电缆感应电压的特点和规律。结果表明:土壤对闪电事件回击阶段的雷电电磁脉冲具有明显的屏蔽作用。对同一次自然闪电,相对于埋设在地面的电源电缆,埋设在地下0.5m处的电源电缆上感应电压脉冲波形峰峰值为52.2%。在选取的起始脉冲时间段内,感应电压均呈衰减振荡波形。通过频谱分析,相对于地面电源电缆,埋地电源电缆感应电压频谱在50kHz^5 MHz的频段范围内频率分量的幅值始终较低,且保持了适当的比例,其中在905.5kHz^1.535 MHz的频段幅值降低得尤为明显。
Based on the lightning protective experiments of automatic weather stations,the characteristics of lightning-induced voltage in power cables with different burying situations are analyzed.The results show that soil has significant shielding effect on LEMP（Lightning ElectroMagnetic Pulse）of return strokes.Compared with the peak lightning-induced voltage in the power cable on the ground,the peak value of the induced voltage under the depth of 0.5 meters is 52.2%.The induced voltage shows an oscillation waveform with a tendency of attenuation.At the same time,the induced voltages of buried power cables show a smaller amplitude in the frequency from 50kHz to 5MHz.The decreasing in the frequency from 905.5kHz to 1.535MHz is more obvious.
出处
《气象科技》
北大核心
2015年第1期36-42,共7页
Meteorological Science and Technology
关键词
自然闪电
电缆
雷电电磁脉冲
感应电压
lightning
LEMP（Lightning ElectroMagnetic Pulse）
power cables
return stroke
induced voltage
