Advertisement

The Similarity Between the Derivative of LEMP and Its Approximate Result for Oblique Channel in Near Area

Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 238)

Abstract

In order to protect sensitive electronic components and electrical equipment against the influence of lightning electromagnetic pulse (LEMP) field in near area, it is necessary to determine the waveform of the lightning electromagnetic field. By using the dipole method to solve Maxwell’s equations, the analytical expressions of lightning electromagnetic fields which is generated by oblique discharge channel are presented. According to the TL model, the general approximate derivative expressions of lightning electromagnetic field are derived and the waveforms of the exact expressions as well as approximate expressions are compared in near area. The results showed that the electromagnetic field derivative waveforms of the approximate results are essentially coincident with that of the accurate results within 100 m and the deviation between the accurate result, and the approximate result increased with the increasing of the horizontal distance; the deviation between the approximate result and the exact result of magnetic field is larger than that of electric field within the same distance. From above analyses it can be concluded that there is an approximation between the lightning electromagnetic field and channel base current and from then on we can get lightning electromagnetic field more effectively.

Keywords

Electromagnetic Field Electrostatic Field Approximate Expression Electrical Equipment Approximate Result 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Rakov VA, Rachidi F (2009) Overview of recent progress in lightning research and lightning protection. IEEE Trans Electromagn Compat 51:428–442CrossRefGoogle Scholar
  2. 2.
    Hussein AM, Milewski M, Janischewskyj W (2008) Correlating the characteristics of the CN tower lightning return-stroke current with those of its generated electromagnetic pulse. IEEE Trans Electromagn Compat 50:642–650CrossRefGoogle Scholar
  3. 3.
    Vernon Cooray (2000) The modeling of positive return strokes in lightning flashes. J Atmos Solar Terr Phys 62:169–187Google Scholar
  4. 4.
    Giovanni Lupb, Cado Peterarca, Vincenzo Tucci et al (2000) EM fields generated by lightning channels with arbitrary location and slope. IEEE Trans Electromagn Compat 42:39–51Google Scholar
  5. 5.
    Bermudez JL, Rachidi F, Janischewskyj W et al (2005) Far field current relationship based on the TL model for lightning return strokes to elevated strike objects. IEEE Trans Electromagn Compat 47:146–157CrossRefGoogle Scholar
  6. 6.
    Jerauld J, Uman MA, Rakov VA et al (2007) Insights into the ground attachment process of natural lightning gained from an unusual triggered-lightning stroke. J Geophys Res 112:D13113-1–D13113-16Google Scholar
  7. 7.
    Chen Ya-zhou, Zhang Fei-zhou, Wei M et al (2001) Several kinds of lightning channel-base current models. In: Proceedings of the international conference on applied electrostatics, 4th Dalian, ChinaGoogle Scholar
  8. 8.
    Jerauld J, Uman MA, Rakov VA et al (2008) Electric and magnetic fields and field derivatives from lightning stepped leaders and first return strokes measured at distances from 100 to 1000 m. J Geophys Res. doi: 10.1029/2008JD010171 Google Scholar
  9. 9.
    Thomson EM (1999) Exact expressions for electric and magnetic fields from a propagating lightning channel with arbitrary orientation. J Geophys Res 104:22293–22300CrossRefGoogle Scholar
  10. 10.
    Gomes C, Cooray V (2000) Concepts of lightning return stroke models. IEEE Trans EMC 42:82–96Google Scholar
  11. 11.
    Uman MA, Mclain DK, Kride EP (1975) The electromagnetic radiation from a finite antenna. Am J Phys 43:33–38CrossRefGoogle Scholar
  12. 12.
    Chen Ya-zhou, Xiao Xue-rong (2007) Characteristic of approximation between LEMP in near area and channel-base current. High Volt Eng 33:23–26Google Scholar
  13. 13.
    Chen Ya-zhou (2002) Lightning electromagnetic pulse field theory calculation and radiation effects on the electric fuze experiment. Shijiazhuang, ChinaGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Wang Xiaojia
    • 1
  • Chen Yazhou
    • 1
  • Wan Haojiang
    • 1
  • Wang Lin
    • 1
  1. 1.Institute of Electrostatic and Electromagnetic ProtectionOrdnance Engineering CollegeShijiazhuangChina

Personalised recommendations