Characteristics of Lightning Electromagnetic Fields Generated by Tortuous Channel

Xiaojia WANG; Yazhou CHEN; Haojiang WAN; Lipeng WANG; Qingxi YANG

doi:10.1587/transcom.2015EBP3490

Characteristics of Lightning Electromagnetic Fields Generated by Tortuous Channel

Xiaojia WANG, Yazhou CHEN, Haojiang WAN, Lipeng WANG, Qingxi YANG

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The analytic expressions of lightning electromagnetic fields generated by tortuous channel with an inclined lower section are obtained by decomposing the current infinitesimal and solving Maxwell's equations. By using the transmission line model and pulse function to express the channel-base current, the influence of length and tilt angle of the oblique part on lightning electromagnetic fields as well as the distribution laws of electromagnetic fields for different azimuth angles are analyzed. The results show that the electromagnetic fields in near area are mainly determined by the lower section of the tortuous discharge channel, and the peak values of electromagnetic fields in different field regions will increase with the increasing of the length of the lower section when L₁ is shorter than the distance that return-stroke speed multiplied by peak time. Whereas the length of the lower section is longer than the distance that return-stroke speed multiplied by peak time, the waveforms of electromagnetic fields will overlap each other and won't be influenced by oblique part length of the discharge channel before the return-stroke current arrives at the inflection point. Moreover, the peak values of electromagnetic fields will decrease with the increase of tilt angle (the azimuth angle φ = 2π/3) and azimuth angle, and the impact of channel geometry on the electromagnetic field strengthens with the distance.

Publication: IEICE TRANSACTIONS on Communications Vol.E99-B No.7 pp.1558-1565

Publication Date: 2016/07/01

Publicized

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2015EBP3490

Type of Manuscript: PAPER

Category: Electromagnetic Compatibility(EMC)

Authors

Xiaojia WANG
  Shijiazhuang Mechanical Engineering College
Yazhou CHEN
  Shijiazhuang Mechanical Engineering College
Haojiang WAN
  Shijiazhuang Mechanical Engineering College
Lipeng WANG
  Shijiazhuang Mechanical Engineering College
Qingxi YANG
  Shijiazhuang Mechanical Engineering College

Keyword

lightning, return-stroke electromagnetic fields, tortuous discharge channe, pulse function

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Xiaojia WANG, Yazhou CHEN, Haojiang WAN, Lipeng WANG, Qingxi YANG, "Characteristics of Lightning Electromagnetic Fields Generated by Tortuous Channel" in IEICE TRANSACTIONS on Communications, vol. E99-B, no. 7, pp. 1558-1565, July 2016, doi: 10.1587/transcom.2015EBP3490.
Abstract: The analytic expressions of lightning electromagnetic fields generated by tortuous channel with an inclined lower section are obtained by decomposing the current infinitesimal and solving Maxwell's equations. By using the transmission line model and pulse function to express the channel-base current, the influence of length and tilt angle of the oblique part on lightning electromagnetic fields as well as the distribution laws of electromagnetic fields for different azimuth angles are analyzed. The results show that the electromagnetic fields in near area are mainly determined by the lower section of the tortuous discharge channel, and the peak values of electromagnetic fields in different field regions will increase with the increasing of the length of the lower section when L₁ is shorter than the distance that return-stroke speed multiplied by peak time. Whereas the length of the lower section is longer than the distance that return-stroke speed multiplied by peak time, the waveforms of electromagnetic fields will overlap each other and won't be influenced by oblique part length of the discharge channel before the return-stroke current arrives at the inflection point. Moreover, the peak values of electromagnetic fields will decrease with the increase of tilt angle (the azimuth angle φ = 2π/3) and azimuth angle, and the impact of channel geometry on the electromagnetic field strengthens with the distance.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2015EBP3490/_p

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@ARTICLE{e99-b_7_1558,
author={Xiaojia WANG, Yazhou CHEN, Haojiang WAN, Lipeng WANG, Qingxi YANG, },
journal={IEICE TRANSACTIONS on Communications},
title={Characteristics of Lightning Electromagnetic Fields Generated by Tortuous Channel},
year={2016},
volume={E99-B},
number={7},
pages={1558-1565},
abstract={The analytic expressions of lightning electromagnetic fields generated by tortuous channel with an inclined lower section are obtained by decomposing the current infinitesimal and solving Maxwell's equations. By using the transmission line model and pulse function to express the channel-base current, the influence of length and tilt angle of the oblique part on lightning electromagnetic fields as well as the distribution laws of electromagnetic fields for different azimuth angles are analyzed. The results show that the electromagnetic fields in near area are mainly determined by the lower section of the tortuous discharge channel, and the peak values of electromagnetic fields in different field regions will increase with the increasing of the length of the lower section when L₁ is shorter than the distance that return-stroke speed multiplied by peak time. Whereas the length of the lower section is longer than the distance that return-stroke speed multiplied by peak time, the waveforms of electromagnetic fields will overlap each other and won't be influenced by oblique part length of the discharge channel before the return-stroke current arrives at the inflection point. Moreover, the peak values of electromagnetic fields will decrease with the increase of tilt angle (the azimuth angle φ = 2π/3) and azimuth angle, and the impact of channel geometry on the electromagnetic field strengthens with the distance.},
keywords={},
doi={10.1587/transcom.2015EBP3490},
ISSN={1745-1345},
month={July},}

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TY - JOUR
TI - Characteristics of Lightning Electromagnetic Fields Generated by Tortuous Channel
T2 - IEICE TRANSACTIONS on Communications
SP - 1558
EP - 1565
AU - Xiaojia WANG
AU - Yazhou CHEN
AU - Haojiang WAN
AU - Lipeng WANG
AU - Qingxi YANG
PY - 2016
DO - 10.1587/transcom.2015EBP3490
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E99-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 2016
AB - The analytic expressions of lightning electromagnetic fields generated by tortuous channel with an inclined lower section are obtained by decomposing the current infinitesimal and solving Maxwell's equations. By using the transmission line model and pulse function to express the channel-base current, the influence of length and tilt angle of the oblique part on lightning electromagnetic fields as well as the distribution laws of electromagnetic fields for different azimuth angles are analyzed. The results show that the electromagnetic fields in near area are mainly determined by the lower section of the tortuous discharge channel, and the peak values of electromagnetic fields in different field regions will increase with the increasing of the length of the lower section when L₁ is shorter than the distance that return-stroke speed multiplied by peak time. Whereas the length of the lower section is longer than the distance that return-stroke speed multiplied by peak time, the waveforms of electromagnetic fields will overlap each other and won't be influenced by oblique part length of the discharge channel before the return-stroke current arrives at the inflection point. Moreover, the peak values of electromagnetic fields will decrease with the increase of tilt angle (the azimuth angle φ = 2π/3) and azimuth angle, and the impact of channel geometry on the electromagnetic field strengthens with the distance.
ER -