تأثیر زمین غیرتختی بر ولتاژ ناشی از رعد و برق در شبکه های توزیع

This paper presents the effect of the terrain geometry in lightning induced voltages calculation on power distribution networks. We have calculated the electromagnetic fields over three different non-flat terrains configurations, by means of the Finite Difference Time Domain (FDTD) method in a two dimensional (2D) cylindrical coordinate system. We have simulated a typical distribution network placed over those terrains, and we have calculated the lightning induced voltages over these lines by means of the Agrawal coupling model. The simulated terrains are for finite and infinite conductivity. It can be seen important differences between the lightning induced voltages over non-flat terrain compared with traditional calculation considering flat terrain, specially when the finite conductivity is considered.