DIRECT LIGHTNING STRIKE ON THE TELECOMMUNICATION ANTENNA POLE

For the wireless communication industry, lightning protection is always an increasing necessity due to the increasing growth of sophisticated electronic devices mounted on separate poles. The direct lightning strike on the telecommunication pole can cause dangerous over voltages, causing damage to the functions of sensitive equipment as well as dangerous step and touch voltages in the area around the pole legs. In this paper will be studied the transient electromagnetic process of the poles and the various lines connected to them under the action of the direct lightning impulse at the top of the pole. In the analysis of the transient process of electromagnetic wave propagation, each conductor of the pole is divided into certain segments. The length of the segment must respect the limit length criterion which is part of the minimum wavelength of the electromagnetic wave arising from the lightning strike. The length of the segment should not be greater than one tenth of the minimum wavelength of the electromagnetic wave. This wavelength is a function of the maximum frequency in the limited lightning frequency spectrum.