Comparison of electromagnetic field for two different lightning pulse current models
暂无分享,去创建一个
In this paper the electromagnetic field produced by a lightning current analytically described by the so called double exponential model is compared with the field produced by the same current (same peak, rise and decay time) analytically described by the model proposed by Heidler. The exponential model has been widely used in literature for its simplicity and its relatively good accuracy. The Heidler model is more complex, but removes the main problem shown by the double exponential: the non-zero derivative at the beginning of the lightning pulse in contrast with the physical phenomenon. In the lightning electromagnetic pulse (LEMP) simulations both models are now used. In the paper we aim to make a comparison between the two. In particular we show that the two models are fairly equivalent in the frequency range up to 2 MHz, namely the range of interest of typical lightning phenomena. In addition, the double exponential model is shown to be conservative for higher frequencies.
[1] M. Uman. Lightning return stroke electric and magnetic fields , 1985 .
[2] M. Ianoz,et al. On lightning return stroke models for LEMP calculations , 1988 .
[3] A. Eriksson,et al. Lightning-Induced Overvoltages on Overhead Distribution Lines , 1982 .
[4] Irene A. Stegun,et al. Handbook of Mathematical Functions. , 1966 .
[5] Martin A. Uman,et al. Calculations of lightning return stroke electric and magnetic fields above ground , 1981 .