.220 Kv Single-circuit Transmission Line Passing Hill Section Of Lightning Electromagnetic Transient Calculation And Lightning Withstand Level

The transmission line is the main artery of the power system. It is a huge power transmission to all directions, connecting the power supply, substations, load, the safe operation of the transmission line, direct influence of the grid stable and reliable power supply to the load. So the safe operation of the transmission line occupies an important position in the grid. The length of the transmission line is large, and wide distribution, is located in the wilderness, easy for lightning stroke. The breaker line due to lightning damage, lead to interrupt of the power supply system, increasing the workload of the switching equipment and line insulation maintenance, and threatening the stable operation of the grid, when lightning line, lightning wave intrusion substations along the line, and the threatening main factors of the substation, caused the key of the power loss. Good transmission line lightning protection is to reduce lightning damage in the power system.The purpose of this thesis is study on lightning withstand level and lightning electromagnetic transient calculation for220kV single circuit transmission line over the mountain section. Base on220kV Fugong-Lanping transmission line across the snow mountain, from tower116#to tower over120#, total tower is five towers (full-length of the line is1.038km), this transmission line is influenced by the heavy ice loading conditions and high altitude geographical environment, and research on variety of transmission line lightning protection, put forward a preliminary proposal of lightning protection, application PSCAD/EMTDC electromagnetic transient simulation platform to build the line in this segment with a dual lightning shielding wires; single lightning shielding wires and coupling ground wire; only single coupling ground wire, the Fine electromagnetic transient simulation model of these three different lightning protection, calculations simulate lightning stroke at the top of tower and mid-span line, and compare lightning withstand level. Based on this, installation of side shielding ground wire to improve lightning protection performance of this line, then calculations simulate and theoretical analysis. Finally, it gave a reasonable lightning protection method for this line, the effects certain indications for anti-ice clinging of transmission lines.