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Lightning electromagnetic field generated by grounding electrode considering soil ionization

Progress in Natural Science:Materials International 2006年第9期16卷 1002-1006页

作者： ZENG Rong , HE Jinliang, ZHANG Bo and GAO Yanqing (State Key Laboratory of Power Systems, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China) State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing 100084 China

A circuit model with lumped time-variable parameter is proposed to calculate the transient characteristic of grounding electrode under lightning current, which takes into consideration the dynamic and nonlinear effect of soil ionization around the grounding electrode. The ionization phenomena in the soil are simulated by means of time-variable parameters under appropriate conditions. The generated electromagnetic field in the air is analyzed by using electrical dipole theory and image theory when the lightning current flows into the grounding electrode. The influence of soil ionization on the electromagnetic field is investigated.

关键词： electromagnetic field grounding electrode soil ionization transient characteristic.

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Calculating the transient behavior of grounding systems using inverse Laplace transform

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第3期12卷 250-262页

作者： Nabiollah RAMEZANI Seyed Mohammad SHAHRTASH Behshahr Branch Iran University of Science and TechnologyBehshahr 47137Iran Center of Excellence for Power Systems Automation and Operation Department of Electrical EngineeringIran University of Science and TechnologyTehran 16844Iran

This paper deals with a unified and novel approach for analyzing the frequency and time domain performance of grounding *** proposed procedure is based on solving the full set of Maxwell's equations in the frequency domain,and enables the exact computation of very near fields at the surface of the grounding grid,as well as far fields,by simple and accurate closed-form expressions for solving Sommerfeld *** addition,the soil ionization is easily considered in the proposed *** frequency domain responses are converted to the time domain by fast inverse Laplace *** results are validated and have shown acceptable accuracy.

关键词： Electromagnetic field Near-field computation High frequency performance soil ionization Grounding system Fast inverse Laplace transform

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