冲击泄流时接地体周围电势分布的FDTD分析
FDTD Analysis of the Distribution of Potential Rise around the
Grounding
摘要 仿照冲击接地实验,建立时域有限差分(FDTD)计算模型,计算冲击泄流时接地体周围的冲击电势,给出了多个取样点上冲击电势的时域波形,分析了时域波形及其空间分布特征,得出了冲击电势测量取样点应位于接地体附近,以及土壤电导率越小,冲击电势峰值越高等结论,此研究结果对于科学地设计冲击接地实验具有重要的指导意义。
关键词 时域有限差分;冲击泄流;冲击电势;冲击接地实验
Abstract Following the impulse grounding experiment, the finite-difference time-domain
(FDTD) calculation model is built; the transient ground potential rise around the
grounding conductor is calculated; the waveforms of the transient ground potential rise
at many sample dots are presented; the time and space domain characteristics of
these potential waveforms are analyzed. It has come to a conclusion that the proper
location of the sample dots should be near the grounding conductor;and the lower the
electrical conductivity (EC) of soil is, the higher the peak value of the transient potential
rise is. The research results have guiding significance for the reasonable design of the
impulse grounding experiment.
Keywords finite-difference time-domain, impulse current discharge, transient ground
potential rise, impulse grounding experiment
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