Proposal of analysis method to reduce back-flashover rate taking account of tower footing resistance

<span lang="EN-US">The number of lightning stroke on the tower 150 kV Koto Panjang-Payakumbuh transmission line located rocky area has been observed. The high value footing resistance indicates occurrence back-flashover in at intensity 74%. is dominantly triggered by value. Also, rate an effect considering electrode installations. A design proposed for grounding system footings order to reduce back-flashover. results presenting numerical simulation that it works properly after adding 4 electrodes. That say, installing electrodes each successfully decreased value, back-flashovers 80% and 90-95% present respectively. insulator voltage can be reduced less than half voltages as much 30-50%. In more detail, 77, drops 2.84 Ω, flashover 0.57/100 km/year 0.99 MV when a disturbance occurs.</span>