IMPROVED DESIGN OF POWER TRANSMISSION LINE GROUNDING ARRANGEMENTS FOR BETTER PROTECTION AGAINST EFFECTS OF LIGHTNING

Power transmission line grounding are usually assumed as concentrated grounding systems. Dynamic behavior of such grounding systems is usually analyzed taking into account only the soil ionization effects. In such cases the propagation effects are usually neglected. Also usually the design requirements for power transmission line grounding are based only on its commercial frequency resistance. This paper considers improved design of power transmission line grounding for better transient performance when they are subjected to fast fronted currents. In such cases propagation effects are dominant in the early time, even in the cases of grounding systems that are usually assumed as concentrated.