Abstract

SOTO, Edison; MARTINEZ, Daniel  and  VERDUGO, Diego. Behaviour of surge arresters against lightning-induced voltages on distribution lines over mountainous zones. TecnoL. [online]. 2019, vol.22, n.45, pp.157-173. ISSN 0123-7799.  https://doi.org/10.22430/22565337.1161.

This paper analyzes how the location of surge arresters on distribution lines over mountainous zones affect the lightning-induced voltages in this kind of lines. Four configurations of non-flat terrains representative of the Colombian topography were chosen. The inclusion of the terrain, the return stroke channel, the distribution line and the calculation of lightning-induced voltages were done by means of the finite difference time domain method in Cartesian coordinates in three dimensions (3D-FDTD). It was found that the induced voltages in non-flat terrains are between 2 and 5 times the obtained for flat terrain. For the case of the simulated terrains A, C and D, the induced voltages surpass the normal operating thresholds of the surge arresters. It supposes that surge arresters placed on distribution lines in mountainous zones have additional strengths to those existing in flat terrains. Nevertheless, there is a configuration (B) where the threshold values are not exceeded.

Keywords : Lightning-induced voltages; non-flat terrains; surge arresters; Finite difference time domain method (FDTD); distribution lines.

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