One of the fundamental issues is phenomenon lightning in transmission system that constantly challenge the design of transmission lines. in this paper by modeling transmission network elements, over voltage cause by lightning andmaximum quantity on isulator chain for two state, i.e. while lightning strike on tip of tower, and impact on guard wires between two tower at the substation terminal tower, and infulance of footing resistance tower on thisprocess ,are simulated, and then for state, direct storke to phase conductor and generated over voltage in power transformer and effect of arrester on reduction of this over voltage is discussed. The study was carried out on an actual power network in south of Iran (Bandar-abbas Power plant to janah station) at 400 KV voltage level,and simulation are performed using EMTP-RV software.
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