Affiliations: [a] Centre for Electromagnetic and Lightning Protection
Research, Faculty of Engineering, University Putra Malaysia, Selangor,
Malaysia | [b] Department of Electrical, Firoozkooh Branch, Islamic
Azad University, Firoozkooh, Iran | [c] Aryaphase Copmany, Tehran, Iran
Correspondence:
[*]
Corresponding author: M. Izadi, Centre for Electromagnetic and
Lightning Protection Research (CELP), Faculty of Engineering, University Putra
Malaysia, UPM, Serdang, Selangor 43400, Malaysia. E-mail:
aryaphase@yahoo.com
Abstract: In this paper a general set of field expressions associated with a
lightning channel are proposed to evaluate the electromagnetic fields due to
lightning in the presence of a ground reflection at the channel base. The
ground reflection factor is due to the difference between the channel and
ground impedances and can enter additional reflected currents into the
lightning channel. The proposed field expressions can support the widely used
current functions and current models directly in the time domain without the
need to apply any extra conversions. Moreover, the proposed expressions are
applied on a sample of lightning current that has been obtained from a
triggered lightning experiment and the evaluated electromagnetic fields are
compared to the corresponding measured fields and the results discussed
accordingly. The results illustrate that the simulated fields based on the
proposed method are in good agreement with the measured fields. Moreover, the
ground reflection factor can have a great effect on the values of the lightning
electromagnetic fields. The proposed field expressions consider all field
components directly in the time domain and vary appropriately to join with
widely used coupling models to evaluate the lightning induced voltage on power
lines without the need to apply any extra conversions.
