Abstract: The protection of power substations against lightning over voltages is important for the reliable operation of the electrical network, since region surges often are chargeable for serious damages of apparatus, leading to power provide interruptions. Studies on the lightning performance of substations are necessary so as to calculate the expected over voltages and take the suitable measures. To the present direction, during this paper analyses for the lightning overvoltage performance of HV/MV substations are performed, considering varied factors, like the grounding resistance, the installation position of surge arresters and also the length of the underground cables. Main novelty of this work is that the outcomes of the lightning performance study are bestowed on an individual basis for each direct lightning hits and back flashover, whereas the analyses take into consideration not solely the grounding resistance (which is that the common observe in similar studies) however additionally the cable and also the installation position of surge arresters. The obtained results may be helpful for engineers and power utilities for the advance of the lightning performance of already existed substations or for the simpler style of recent ones.

Keywords: Transmission line, power substation protection, surge arresters, lightening protection

| DOI: 10.17148/IJIREEICE.2018.667