Title :
Evaluation of Electric Fields Radiated by Lightning Stepped Leaders on Finitely Conductive Ground
Author :
Zhi-Dong Jiang ; Bi-Hua Zhou ; Shi Qiu ; Li-hua Shi
Author_Institution :
Nat. Key Lab. on Electromagn. Environ. Effects & Electro-Opt. Eng., PLA Univ. of Sci. & Technol., Nanjing, China
Abstract :
In this study, we investigate the characteristics of the electric fields associated with an inclined stepped-leader channel in the presence of finitely conducting ground. First, a finite-difference time-domain method in 2-D cylindrical coordinates is proposed. Then, the 2-D cylindrical coordinates is rotated through an angle of given value, the inclined stepped-leader channel can be dealt equivalently as a vertical channel. Thus, the conductivity σ and permittivity ε in the Yee cell along the inclined ground surface are dealt with by applying a contour-path technique. Finally, the propagation effects caused by finitely conducting ground and inclination angle of the stepped-leader channels on the features of the electric fields generated by stepped leaders are discussed. The results show that the rise time, the half-width time, and the peak of the electric field change significantly in propagating over finitely conducting ground.
Keywords :
electric fields; electromagnetic compatibility; finite difference time-domain analysis; permittivity; 2D cylindrical coordinate; Yee cell; contour path technique; electric field radiation evaluation; finite-difference time-domain method; finitely conductive ground; inclination angle; lightning stepped leader; stepped-leader channel; Conductivity; Finite difference methods; Lightning; Numerical simulation; Permittivity; Time-domain analysis; Conformal mesh; finite-difference time-domain (FDTD); inclined stepped-leader channel; lightning electromagnetic fields;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
DOI :
10.1109/TEMC.2015.2429671