Abstract—This paper presents numerical computation of lightning induced surges on a overhead power conductor taking into account real earth conductivity. A modified dipole technique is used to compute lightning generated electromagnetic fields radiated from lightning return strokes. A modified Agrawal transmission line model is used to calculate interaction between the electromagnetic fields and the overhead power conductor based on the finite difference method. Induced overvoltage waveforms resulting in from a front return stroke current model are presented for different line heights. Validity of the new dipole technique as well as the modified Agrawal model is also tested.

Index Terms—lightning induced surge, electromagnetic compatibility, finite difference computation, overvoltage phenomenon, and computational electro-magnetics.

S. M. Abdur Razzak is with the Electrical and Electronic Department,Rajshahi University of Engineering & Technology, Rajshahi-6204,Bangladesh (phone: 880-721-750356; fax: 880-721-750356; e-mail:razzak91@yahoo.com).
M. A. Rashid is with the Graduate School of Engineering & Science,University of the Ryukyus, Okinawa 903-0213, Japan (e-mail:roshid68@yahoo.com).
M. Z. I. Serker is with the Electrical and Electronic Engineering Department, Rajshahi University of Engineering & Technology,Rajshahi-6204, Bangladesh (mzi_ruet@yahoo.com.Tamaki Shiro is with the Graduate School of Engineering & Science,University of the Ryukyus, Okinawa 903-0213, Japan.
M. Mortuza Ali is with the Electrical and Electronic Engineering Department, Rajshahi University of Engineering & Technology,Rajshahi-6204, Bangladesh (mali57@yahoo.com).

Cite: S. M. Abdur Razzak, M. Abdur Rashid, M. Z. I. Sarkar, Shiro Tamaki and M. Mortuza Ali, "Numerical Computation of Lightning Induced Surges on Overhead Power  Distribution  Lines,"  International  Journal  of
Computer and Electrical Engineering vol. 2, no. 5, pp. 826-829, 2010.