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Front. Inform. Technol. Electron. Eng.  2011, Vol. 12 Issue (3): 250-262    DOI: 10.1631/jzus.C0910777
    
Calculating the transient behavior of grounding systems using inverse Laplace transform
Nabiollah Ramezani1, Seyed Mohammad Shahrtash2
1 Behshahr Branch, Iran University of Science and Technology, Behshahr 47137, Iran 2 Center of Excellence for Power Systems Automation and Operation, Department of Electrical Engineering, Iran University of Science and Technology, Tehran 16844, Iran
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Abstract  This paper deals with a unified and novel approach for analyzing the frequency and time domain performance of grounding systems. The 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 integrals. In addition, the soil ionization is easily considered in the proposed method. The frequency domain responses are converted to the time domain by fast inverse Laplace transform. The results are validated and have shown acceptable accuracy.

Key words： Electromagnetic field      Near-field computation      High frequency performance      Soil ionization      Grounding system      Fast inverse Laplace transform     
Received: 20 December 2009      Published: 09 March 2011
CLC:  O441.5  
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Nabiollah Ramezani, Seyed Mohammad Shahrtash. Calculating the transient behavior of grounding systems using inverse Laplace transform. Front. Inform. Technol. Electron. Eng., 2011, 12(3): 250-262.

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http://www.zjujournals.com/xueshu/fitee/10.1631/jzus.C0910777     OR     http://www.zjujournals.com/xueshu/fitee/Y2011/V12/I3/250


Calculating the transient behavior of grounding systems using inverse Laplace transform

This paper deals with a unified and novel approach for analyzing the frequency and time domain performance of grounding systems. The 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 integrals. In addition, the soil ionization is easily considered in the proposed method. The frequency domain responses are converted to the time domain by fast inverse Laplace transform. The 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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