...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Electric power systems research >On the influence of the soil stratification and frequency-dependent parameters on lightning electromagnetic fields
【24h】

On the influence of the soil stratification and frequency-dependent parameters on lightning electromagnetic fields

机译：土壤分层和频率相关参数对雷电电磁场的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present an analysis of lightning electromagnetic fields taking into account the soil stratification and frequency dependence of its electrical parameters. Two current waveforms corresponding to typical first and subsequent return strokes are considered for the analysis. Different cases for the soil (homogeneous, 2-layer, frequency-dependent/constant electrical parameters) are considered. The analysis is carried out considering different distance ranges: close (50 m), intermediate (5 km) and distant (100 km). The obtained results confirm that the vertical electric field and the azimuthal magnetic field at close range can be evaluated assuming the ground as a perfectly conducting plane. The impact of the soil stratification and frequency-dependent parameters on the vertical electric field and azimuthal magnetic field appear at intermediate and distant ranges. On the other hand, the horizontal electric field is found to be very sensitive to the ground stratification for all the considered distance ranges. However, at close range, the impact of the soil becomes less significant for observation points that are located at above-ground heights of 10 m or higher. It is shown that the three field components are affected more markedly by the soil stratification than by the frequency dependence of its electrical parameters, especially for intermediate and distant ranges (i.e., 5 km and 100 km). Furthermore, subsequent return stroke fields are more significantly affected by the soil stratification and frequency-dependence compared to first return stroke fields. The impact of the frequency-dependent soil parameters on the considered field components is more noticeable in a poorly conducting soil compared to a good conducting soil. We present also a comparison between simulation results with simultaneous measurements of current and distant vertical electric fields associated with rocket-triggered lightning flashes. It is shown that the computed vertical electric field waveforms for the case of a two-layer soil follow to a much better extent the corresponding experimental waveforms compared a non-stratified ground model. The frequency-dependence of the soil affects slightly the early-time response of the field. However, the late-time response of the field is essentially determined by the soil stratification.
机译：我们目前对雷电电磁场的分析考虑了土壤分层及其电参数的频率依赖性。考虑与典型的第一和随后的返回冲程相对应的两个电流波形用于分析。考虑土壤的不同情况（均匀，两层，频率相关/恒定的电参数）。分析时要考虑不同的距离范围：近距离（50 m），中距离（5 km）和远距离（100 km）。获得的结果证实，可以将地面假定为理想导电平面来评估近距离范围内的垂直电场和方位磁场。土壤分层和频率相关参数对垂直电场和方位磁场的影响出现在中间和远处。另一方面，对于所有考虑的距离范围，发现水平电场对地面分层非常敏感。但是，在近距离处，对于位于地面以上10 m或更高高度的观测点，土壤的影响变得不那么明显。结果表明，这三个场分量受土壤分层的影响比受其电参数的频率依赖性影响更大，特别是对于中距离和远距离（即5 km和100 km）而言。此外，与第一个回程场相比，后续的回程场受土壤分层和频率依赖性的影响更大。与导电性良好的土壤相比，在导电性较差的土壤中，频率相关的土壤参数对所考虑的场分量的影响更为明显。我们还提出了模拟结果与同时测量与火箭触发的雷电相关的电流和远距离垂直电场之间的比较。结果表明，与非分层地面模型相比，两层土壤情况下计算出的垂直电场波形在更大程度上遵循了相应的实验波形。土壤的频率依赖性会稍微影响田间的早期响应。但是，田间的后期响应基本上由土壤分层决定。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号