| Lightning is a natural phenomenon. The harm of lightning on power equipment, especially on a transmission line, is analyzed in this thesis. By the lightning-shielding design of a transmission line, some issues are investigated in detail. These issues include how to improve the lightning-shielding level of a transmission line, how to lower effectively the lightning trip-out rate of a transmission line, and how to decrease the impact of lightning on the safe operation of a power grid. The principle of lightning discharge to a transmission line is described in this thesis. The forming and developing processes of lightning are introduced. Also introduced are the forming and developing processes of lightning voltage and lightning current, as well as the discharge principle under the breakdown of an insulator. Several practical ways of lightning-shielding design of a transmission line in our country are analyzed.Using the common and practical methods for lightning-shielding design of a transmission line, the lightning shielding of 66kV LONGFU line is analyzed in detail and then designed. The actuality of the local electric grid is taken into considered in the design. Also considered are the local climate, topography, environment, and other factors. The best lightning-shielding scheme for the transmission line is proposed.
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