AUTHORS: Mahmud Trainba, Christos A. Christodoulou, Vasiliki Vita, Lambros Ekonomou

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ABSTRACT: The protection of power substations against lightning overvoltages is critical for the reliable operation of the electrical network, since atmospheric surges frequently are liable for serious damages of equipment, resulting in power supply interruptions. Studies on the lightning performance of substations are necessary in order to calculate the expected overvoltages and take the appropriate measures. To this direction, in this paper analyses for the lightning overvoltage performance of HV/MV substations are performed, considering various factors, such as the grounding resistance, the installation position of surge arresters and the length of the underground cables. Main novelty of the current work is that the outcomes of the lightning performance study are presented separately for both direct lightning hits and backflashover, while the analyses take under consideration not only the grounding resistance (which is the common practice in similar studies) but also the cable length and the installation position of surge arresters. The obtained results can be useful for engineers and power utilities for the improvement of the lightning performance of already existed substations or for the more effective design of new ones.

KEYWORDS: Cable, grounding resistance, lightning performance, substation, surge arresters, transmission line

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