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Lightning caused interruptions by shielding failures or by back-flashover. Lightning over voltages cannot be avoided but their influence can be limited by appropriate over voltage protection. In this paper, Characteristics and hazards of lightning overvoltage in the Egyptian Bassous-Cairo West 500-kV transmission line single circuit are analyzed and discussed. Some effective factors, which affecting generated lightning back-flashover across the insulator of a transmission system are analyzed. These factors are included magnitude of lightning stroke, front and tail times of lightning stroke impulse, and chopped current. The influence of connecting Substations Surge Arrester SSA and Line Surge Arrester LSA are investigated. This paper also provides a procedure to limit lightning flashover and back-flashover. ATPEMTP simulation program is applied to analyze the lightning over-voltage of power line. The result show that there is a 100% probability of an insulator flashover in case high peak, short front time, and any tail time of lightning strokes without any installed arrester. LSA prevent insulator flashover than back flash over.

Effective Elimination Factors to the Generated Lightning Flashover in High Voltage Transmission Network