Title :
Rational approximation for the time domain implementation of Cooray-Rubinstein formula
Author :
Delfino, F. ; Girdinio, P. ; Procopio, R. ; Rossi, Mattia ; Rachidi, Farhad
Author_Institution :
Naval & Electr. Eng. Dept., Univ. of Genoa, Opera, Italy
Abstract :
The Cooray-Rubinstein (CR) formula is one of the most popular techniques used to take into account the finite ground conductivity in the evaluation of the radial component of the lightning return stroke electric field. Nevertheless, one difficulty lies in its application: as it is expressed in the frequency domain, it can be difficult to code it in time domain simulation programs for lightning-induced overvoltages analysis. The paper shows how a suitable rational approximation of the impedance term appearing in the CR formula can lead to a simple time domain implementation of this formula. The proposed implementation offers a considerably higher computational efficiency than that of conventional methods.
Keywords :
approximation theory; electromagnetic wave propagation; lightning; overvoltage; rational functions; time-domain analysis; Cooray-Rubinstein formula; computational efficiency; finite ground conductivity; lightning return stroke electric field; lightning-induced overvoltages analysis; rational approximation; time domain simulation program; Approximation methods; Conductivity; Equations; Lightning; Magnetic fields; Permittivity; Time domain analysis; Electromagnetic radiation; ground wave propagation; lightning modeling; lightning return stroke;
Conference_Titel :
PowerTech, 2011 IEEE Trondheim
Conference_Location :
Trondheim
Print_ISBN :
978-1-4244-8419-5
Electronic_ISBN :
978-1-4244-8417-1
DOI :
10.1109/PTC.2011.6019451
